10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2023

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For transition period from         to

Commission File Number 001-39439

ATI Physical Therapy, Inc.

(Exact name of registrant as specified in its charter)

Delaware	85-1408039
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)

790 Remington Boulevard

Bolingbrook, IL 60440

(630) 296-2223

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol	Name of each exchange on which registered
Class A common stock, $0.0001 par value	ATIP	New York Stock Exchange
Redeemable Warrants, each whole warrant exercisable for one share of Class A common stock at an exercise price of $11.50 per share	ATIP WS	New York Stock Exchange

Indicate by check mark whether the Registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☐	Accelerated filer	☒
Non-accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act): Yes ☐ No ☒

As of May 3, 2023, there were approximately 208,495,548 shares of the registrant's common stock legally outstanding.

1

Table of Contents

	Page
PART I - FINANCIAL INFORMATION - UNAUDITED
Item 1. Financial Statements	7
Condensed Consolidated Balance Sheets	8
Condensed Consolidated Statements of Operations	9
Condensed Consolidated Statements of Comprehensive Loss	10
Condensed Consolidated Statements of Changes in Stockholders' Equity	11
Condensed Consolidated Statements of Cash Flows	12
Notes to Condensed Consolidated Financial Statements	14
Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations	44
Item 3. Quantitative and Qualitative Disclosures About Market Risk	68
Item 4. Controls and Procedures	69
PART II - OTHER INFORMATION
Item 1. Legal Proceedings	71
Item 1A. Risk Factors	71
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	71
Item 3. Defaults Upon Senior Securities	71
Item 4. Mine Safety Disclosures	71
Item 5. Other Information	71
Item 6. Exhibits	72
Signatures	73

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CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

Certain statements included in this Form 10-Q that are not historical facts are forward-looking statements for purposes of the safe harbor provisions under the United States Private Securities Litigation Reform Act of 1995. Forward-looking statements may be identified by the use of the words such as “believe,” “may,” “will,” “estimate,” “continue,” “anticipate,” “intend,” “expect,” “should,” “would,” “plan,” “project,” “forecast,” “predict,” “potential,” “seem,” “seek,” “future,” “outlook,” “target” or similar expressions that predict or indicate future events or trends or that are not statements of historical matters. These forward-looking statements include, but are not limited to, statements regarding the impact of physical therapist attrition and ability to achieve and maintain clinical staffing levels and clinician productivity, anticipated visit and referral volumes and other factors on the Company's overall profitability, and estimates and forecasts of other financial and performance metrics and projections of market opportunity. These statements are based on various assumptions, whether or not identified in this Form 10-Q, and on the current expectations of the Company’s management and are not predictions of actual performance. These forward-looking statements are provided for illustrative purposes only and are not intended to serve as, and must not be relied on by any investor as, a guarantee, an assurance, a prediction or a definitive statement of fact or probability. Actual events and circumstances are difficult or impossible to predict and will differ from assumptions. Many actual events and circumstances are beyond the control of the Company.

These forward-looking statements are subject to a number of risks and uncertainties, including:

•our liquidity position raises substantial doubt about our ability to continue as a going concern;

•risks associated with liquidity and capital markets, including the Company's ability to generate sufficient cash flows, together with cash on hand, to run its business, cover liquidity and capital requirements and resolve substantial doubt about the Company's ability to continue as a going concern;

•our ability to meet financial covenants as required by our 2022 Credit Agreement;

•risks related to outstanding indebtedness and preferred stock, rising interest rates and potential increases in borrowing costs, compliance with associated covenants and provisions and the potential need to seek additional or alternative debt or capital financing in the future;

•risks related to the Company's ability to access additional financing or alternative options when needed;

•our dependence upon governmental and third-party private payors for reimbursement and that decreases in reimbursement rates, renegotiation or termination of payor contracts or unfavorable changes in payor, state and service mix may adversely affect our financial results;

•federal and state governments’ continued efforts to contain growth in Medicaid expenditures, which could adversely affect the Company’s revenue and profitability;

•payments that we receive from Medicare and Medicaid being subject to potential retroactive reduction;

•changes in Medicare rules and guidelines and reimbursement or failure of our clinics to maintain their Medicare certification and/or enrollment status;

•compliance with federal and state laws and regulations relating to the privacy of individually identifiable patient information, and associated fines and penalties for failure to comply;

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•risks associated with public health crises, including COVID-19 (and any existing and future variants) and its direct and indirect impacts on the business, which could lead to a decline in visit volumes and referrals;

•risks related to the impact on our workforce of mandatory COVID-19 vaccination of employees;

•our inability to compete effectively in a competitive industry, subject to rapid technological change and cost inflation, including competition that could impact the effectiveness of our strategies to improve patient referrals and our ability to identify, recruit and retain skilled physical therapists;

•our inability to maintain high levels of service and patient satisfaction;

•risks associated with the locations of our clinics, including the economies in which we operate, size and expected growth of our addressable markets, and the potential need to close clinics and incur closure costs;

•our dependence upon the cultivation and maintenance of relationships with customers, suppliers, physicians and other referral sources;

•the severity of climate change or the weather and natural disasters that can occur in the regions of the U.S. in which we operate, which could cause disruption to our business;

•risks associated with future acquisitions, which may use significant resources, may be unsuccessful and could expose us to unforeseen liabilities;

•failure of third-party vendors, including customer service, technical and IT support providers and other outsourced professional service providers to adequately address customers’ requests and meet Company requirements;

•risks associated with our reliance on IT infrastructure in critical areas of our operations including, but not limited to, cyber and other security threats;

•a security breach of our IT systems or our third-party vendors’ IT systems may subject us to potential legal action and reputational harm and may result in a violation of the Health Insurance Portability and Accountability Act of 1996 or the Health Information Technology for Economic and Clinical Health Act;

•maintaining clients for which we perform management and other services, as a breach or termination of those contractual arrangements by such clients could cause operating results to be less than expected;

•our failure to maintain financial controls and processes over billing and collections or disputes with third-parties could have a significant negative impact on our financial condition and results of operations;

•our operations are subject to extensive regulation and macroeconomic uncertainty;

•our ability to meet revenue and earnings expectations;

•risks associated with applicable state laws regarding fee-splitting and professional corporation laws;

4

•inspections, reviews, audits and investigations under federal and state government programs and payor contracts that could have adverse findings that may negatively affect our business, including our results of operations, liquidity, financial condition and reputation;

•changes in or our failure to comply with existing federal and state laws or regulations or the inability to comply with new government regulations on a timely basis;

•the outcome of any legal and regulatory matters, proceedings or investigations instituted against us or any of our directors or officers, and whether insurance coverage will be available and/or adequate to cover such matters or proceedings;

•our facilities face competition for experienced physical therapists and other clinical providers that may increase labor costs and reduce profitability;

•risks associated with our ability to attract and retain talented executives and employees amidst the impact of unfavorable labor market dynamics and wage inflation, including potential failure of steps being taken to reduce attrition of physical therapists and increase hiring of physical therapists;

•risks resulting from the IPO Warrants, Earnout Shares and Vesting Shares being accounted for as liabilities and the changes in fair value affecting our financial results;

•further impairments of goodwill and other intangible assets, which represent a significant portion of our total assets, especially in view of the Company’s recent market valuation;

•our inability to remediate the material weaknesses in internal control over financial reporting related to income taxes and to maintain effective internal control over financial reporting;

•costs related to operating as a public company; and

•risks associated with our efforts and ability to regain and sustain compliance with the listing requirements of our securities on the New York Stock Exchange ("NYSE").

If any of these risks materialize or our assumptions prove incorrect, actual results could differ materially from the results implied by these forward-looking statements.

These and other factors that could cause actual results to differ from those implied by the forward-looking statements in this Form 10-Q are more fully described under the heading “Item 1A. Risk Factors” in our Annual Report on Form 10-K filed with the SEC on March 16, 2023 and in this Form 10-Q. The risks described under the heading “Item 1A. Risk Factors” are not exhaustive. Other sections of this Form 10-Q describe additional factors that could adversely affect the business, financial condition or results of operations of the Company. New risk factors emerge from time to time and it is not possible to predict all such risk factors, nor can the Company assess the impact of all such risk factors on the business of the Company or the extent to which any factor or combination of factors may cause actual results to differ materially from those contained in any forward-looking statements. All forward-looking statements attributable to the Company or persons acting on its behalf are expressly qualified in their entirety by the foregoing cautionary statements. Readers should not place undue reliance on forward-looking statements. The Company undertakes no obligations to publicly update or revise any forward-looking statements after the date they are made or to reflect the occurrence of unanticipated events, whether as a result of new information, future events or otherwise, except as required by law.

5

In addition, statements of belief and similar statements reflect the beliefs and opinions of the Company on the relevant subject. These statements are based upon information available to the Company, as applicable, as of the date of this Form 10-Q, and while the Company believes such information forms a reasonable basis for such statements, such information may be limited or incomplete, and statements should not be read to indicate that the Company has conducted an exhaustive inquiry into, or review of, all potentially available relevant information. These statements are inherently uncertain and you are cautioned not to unduly rely upon these statements.

6

PART I - FINANCIAL INFORMATION - UNAUDITED

Item 1. Financial Statements

ATI Physical Therapy, Inc.

Condensed Consolidated Balance Sheets

($ in thousands, except share and per share data)

(unaudited)

	March 31, 2023		December 31, 2022
Assets:
Current assets:
Cash and cash equivalents	$	63,075	$	83,139
Accounts receivable (net of allowance for doubtful accounts of $52,549 and $47,620 at March 31, 2023 and December 31, 2022, respectively)	82,210		80,673
Prepaid expenses	9,373		13,526
Other current assets	6,722		10,040
Assets held for sale	5,469		6,755
Total current assets	166,849		194,133
Property and equipment, net	119,508		123,690
Operating lease right-of-use assets	224,725		226,092
Goodwill, net	286,458		286,458
Trade name and other intangible assets, net	246,398		246,582
Other non-current assets	1,823		2,030
Total assets	$	1,045,761	$	1,078,985
Liabilities, Mezzanine Equity and Stockholders' Equity:
Current liabilities:
Accounts payable	$	10,245	$	12,559
Accrued expenses and other liabilities	47,564		53,672
Current portion of operating lease liabilities	51,911		47,676
Liabilities held for sale	1,503		2,614
Total current liabilities	111,223		116,521
Long-term debt, net	534,137		531,600
Warrant liability	296		98
Contingent common shares liability	2,126		2,835
Deferred income tax liabilities	18,948		18,886
Operating lease liabilities	216,396		218,424
Other non-current liabilities	1,821		1,834
Total liabilities	884,947		890,198
Commitments and contingencies (Note 16)
Mezzanine equity:
Series A Senior Preferred Stock, $0.0001 par value; 1.0 million shares authorized; 0.2 million shares issued and outstanding; $1,140.48 stated value per share at March 31, 2023; $1,108.34 stated value per share at December 31, 2022	140,340		140,340
Stockholders' equity:
Class A common stock, $0.0001 par value; 470.0 million shares authorized; 208.7 million shares issued, 199.5 million shares outstanding at March 31, 2023; 207.5 million shares issued, 198.4 million shares outstanding at December 31, 2022	20		20
Treasury stock, at cost, 0.24 million shares and 0.08 million shares at March 31, 2023 and December 31, 2022, respectively	(197)		(146)
Additional paid-in capital	1,380,150		1,378,696
Accumulated other comprehensive income	1,443		4,899
Accumulated deficit	(1,365,781)		(1,339,511)
Total ATI Physical Therapy, Inc. equity	15,635		43,958
Non-controlling interests	4,839		4,489
Total stockholders' equity	20,474		48,447
Total liabilities, mezzanine equity and stockholders' equity	$	1,045,761	$	1,078,985

The accompanying notes to the condensed consolidated financial statements are an integral part of these statements.

8

ATI Physical Therapy, Inc.

Condensed Consolidated Statements of Operations

(in thousands, except per share data)

(unaudited)

	Three Months Ended
	March 31, 2023		March 31, 2022
Net patient revenue	$	150,754	$	138,925
Other revenue	16,178		14,897
Net revenue	166,932		153,822
Cost of services:
Salaries and related costs	90,703		87,415
Rent, clinic supplies, contract labor and other	52,878		51,615
Provision for doubtful accounts	4,125		5,105
Total cost of services	147,706		144,135
Selling, general and administrative expenses	30,595		30,024
Goodwill, intangible and other asset impairment charges	—		155,741
Operating loss	(11,369)		(176,078)
Change in fair value of warrant liability	198		(1,677)
Change in fair value of contingent common shares liability	(709)		(24,334)
Interest expense, net	13,936		8,656
Other expense, net	354		2,781
Loss before taxes	(25,148)		(161,504)
Income tax expense (benefit)	62		(23,281)
Net loss	(25,210)		(138,223)
Net income (loss) attributable to non-controlling interests	1,060		(473)
Net loss attributable to ATI Physical Therapy, Inc.	$	(26,270)	$	(137,750)
Loss per share of Class A common stock:
Basic	$	(0.15)	$	(0.70)
Diluted	$	(0.15)	$	(0.70)
Weighted average shares outstanding:
Basic and diluted	204,921		199,971

The accompanying notes to the condensed consolidated financial statements are an integral part of these statements.

9

ATI Physical Therapy, Inc.

Condensed Consolidated Statements of Comprehensive Loss

($ in thousands)

(unaudited)

	Three Months Ended
	March 31, 2023		March 31, 2022
Net loss	$	(25,210)	$	(138,223)
Other comprehensive (loss) income:
Cash flow hedges	(3,456)		3,752
Comprehensive loss	(28,666)		(134,471)
Net income (loss) attributable to non-controlling interests	1,060		(473)
Comprehensive loss attributable to ATI Physical Therapy, Inc.	$	(29,726)	$	(133,998)

The accompanying notes to the condensed consolidated financial statements are an integral part of these statements.

10

ATI Physical Therapy, Inc.

Condensed Consolidated Statements of Changes in Stockholders' Equity

($ in thousands, except share data)

(unaudited)

	Common Stock			Treasury Stock			Additional Paid-In Capital		Accumulated Other Comprehensive Income (Loss)		Accumulated Deficit		Non-Controlling Interests		Total Stockholders' Equity
	Shares	Amount		Shares	Amount
Balance at January 1, 2023	198,357,356	$	20	77,026	$	(146)	$	1,378,696	$	4,899	$	(1,339,511)	$	4,489	$	48,447
Vesting of restricted shares distributed to holders of ICUs	37,545	—		—	—		—		—		—		—		—
Issuance of common stock upon vesting of restricted stock units and awards	1,269,367	—		—	—		—		—		—		—		—
Tax withholdings related to net share settlement of restricted stock units and awards	(158,079)	—		158,079	(51)		—		—		—		—		(51)
Non-cash share-based compensation	—	—		—	—		1,454		—		—		—		1,454
Other comprehensive loss	—	—		—	—		—		(3,456)		—		—		(3,456)
Distribution to non-controlling interest holders	—	—		—	—		—		—		—		(710)		(710)
Net income attributable to non-controlling interests	—	—		—	—		—		—		—		1,060		1,060
Net loss attributable to ATI Physical Therapy, Inc.	—	—		—	—		—		—		(26,270)		—		(26,270)
Balance at March 31, 2023	199,506,189	$	20	235,105	$	(197)	$	1,380,150	$	1,443	$	(1,365,781)	$	4,839	$	20,474

	Common Stock			Treasury Stock			Additional Paid-In Capital		Accumulated Other Comprehensive Income		Accumulated Deficit		Non-Controlling Interests		Total Stockholders' Equity
	Shares	Amount		Shares	Amount
Balance at January 1, 2022	197,409,964	$	20	29,791	$	(95)	$	1,351,597	$	28	$	(847,132)	$	7,089	$	511,507
Issuance of 2022 Warrants	—	—		—	—		19,725		—		—		—		19,725
Vesting of restricted shares distributed to holders of ICUs	75,497	—		—	—		—		—		—		—		—
Issuance of common stock upon vesting of restricted stock awards	40,613	—		—	—		—		—		—		—		—
Tax withholdings related to net share settlement of restricted stock awards	(12,824)	—		12,824	(22)		—		—		—		—		(22)
Non-cash share-based compensation	—	—		—	—		1,960		—		—		—		1,960
Other comprehensive income	—	—		—	—		—		3,752		—		—		3,752
Distribution to non-controlling interest holders	—	—		—	—		—		—		—		(473)		(473)
Net loss attributable to non-controlling interests	—	—		—	—		—		—		—		(473)		(473)
Net loss attributable to ATI Physical Therapy, Inc.	—	—		—	—		—		—		(137,750)		—		(137,750)
Balance at March 31, 2022	197,513,250	$	20	42,615	$	(117)	$	1,373,282	$	3,780	$	(984,882)	$	6,143	$	398,226

The accompanying notes to the condensed consolidated financial statements are an integral part of these statements.

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ATI Physical Therapy, Inc.

Condensed Consolidated Statements of Cash Flows

($ in thousands)

(unaudited)

	Three Months Ended
	March 31, 2023		March 31, 2022
Operating activities:
Net loss	$	(25,210)	$	(138,223)
Adjustments to reconcile net loss to net cash used in operating activities:
Goodwill, intangible and other asset impairment charges	—		155,741
Depreciation and amortization	9,691		10,111
Provision for doubtful accounts	4,125		5,105
Deferred income tax provision	62		(23,281)
Amortization of right-of-use assets	11,850		11,807
Non-cash share-based compensation	1,454		1,960
Amortization of debt issuance costs and original issue discount	838		660
Non-cash interest expense	1,736		—
Loss on extinguishment of debt	—		2,809
Loss (gain) on disposal and sale of assets	489		(219)
Change in fair value of warrant liability	198		(1,677)
Change in fair value of contingent common shares liability	(709)		(24,334)
Changes in:
Accounts receivable, net	(5,770)		(10,459)
Prepaid expenses and other current assets	4,073		588
Other non-current assets	33		14
Accounts payable	(2,439)		(928)
Accrued expenses and other liabilities	(6,168)		(544)
Operating lease liabilities	(8,476)		(11,555)
Other non-current liabilities	(1)		(37)
Medicare Accelerated and Advance Payment Program Funds	—		(4,269)
Net cash used in operating activities	(14,224)		(26,731)
Investing activities:
Purchases of property and equipment	(5,434)		(8,772)
Proceeds from sale of property and equipment	—		114
Proceeds from sale of clinics	355		—
Net cash used in investing activities	(5,079)		(8,658)

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Financing activities:
Proceeds from long-term debt	—		500,000
Deferred financing costs	—		(12,952)
Original issue discount	—		(10,000)
Principal payments on long-term debt	—		(555,048)
Proceeds from issuance of Series A Senior Preferred Stock	—		144,667
Proceeds from issuance of 2022 Warrants	—		20,333
Equity issuance costs and original issue discount	—		(4,935)
Taxes paid on behalf of employees for shares withheld	(51)		(22)
Distribution to non-controlling interest holders	(710)		(473)
Net cash (used in) provided by financing activities	(761)		81,570
Changes in cash and cash equivalents:
Net (decrease) increase in cash and cash equivalents	(20,064)		46,181
Cash and cash equivalents at beginning of period	83,139		48,616
Cash and cash equivalents at end of period	$	63,075	$	94,797
Supplemental noncash disclosures:
Derivative changes in fair value (1)	$	3,456	$	(3,752)
Purchases of property and equipment in accounts payable	$	1,771	$	2,223
Other supplemental disclosures:
Cash paid for interest	$	9,563	$	3,932
Cash received from hedging activities	$	3,418	$	—
Cash paid for taxes	$	—	$	35

(1) Derivative changes in fair value related to unrealized loss (gain) on cash flow hedges, including the impact of reclassifications.

The accompanying notes to the condensed consolidated financial statements are an integral part of these statements.

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Note 1. Overview of the Company

ATI Physical Therapy, Inc., together with its subsidiaries (herein referred to as “we,” “the Company,” “ATI Physical Therapy” and “ATI”), is a nationally recognized healthcare company, specializing in outpatient rehabilitation and adjacent healthcare services. The Company provides outpatient physical therapy services under the name ATI Physical Therapy and, as of March 31, 2023, had 909 clinics located in 24 states (as well as 19 clinics under management service agreements). The Company offers a variety of services within its clinics, including physical therapy to treat spine, shoulder, knee and neck injuries or pain; work injury rehabilitation services, including work conditioning and work hardening; hand therapy; and other specialized treatment services. The Company’s direct and indirect wholly-owned subsidiaries include, but are not limited to, Wilco Holdco, Inc., ATI Holdings Acquisition, Inc. and ATI Holdings, LLC.

Impact of COVID-19 and CARES Act

The coronavirus ("COVID-19") pandemic in the United States resulted in changes to our operating environment. We continue to closely monitor the impact of COVID-19 on all aspects of our business, and our priorities remain protecting the health and safety of employees and patients, maximizing the availability of services to satisfy patient needs and improving the operational and financial stability of our business. While we expect the disruption caused by COVID-19 and resulting impacts to diminish over time, we cannot predict the length of such impacts, and if such impacts continue for an extended period, it could have a continued effect on the Company’s results of operations, financial condition and cash flows, which could be material.

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) was signed into law providing reimbursement, grants, waivers and other funds to assist health care providers during the COVID-19 pandemic. The Company realized benefits under the CARES Act including, but not limited to, the receipt of Medicare Accelerated and Advance Payment Program ("MAAPP") funds and deferral of depositing the employer portion of Social Security taxes, interest-free and penalty-free. During the year ended December 31, 2022, the remaining obligations related to these benefits were applied and repaid. During the three months ended March 31, 2022, the Company applied $4.3 million in MAAPP funds against the outstanding liability at that time.

Note 2. Basis of Presentation and Recent Accounting Standards

Basis of presentation

The accompanying unaudited condensed consolidated financial statements of the Company were prepared in accordance with U.S. generally accepted accounting principles ("GAAP") for interim financial information and in accordance with the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations, although the Company believes that the disclosures are adequate to make the information presented not misleading.

Management believes the unaudited condensed consolidated financial statements for interim periods presented contain all necessary adjustments to state fairly, in all material respects, the Company's financial position, results of operations and cash flows for the interim periods presented.

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Operating results for the three months ended March 31, 2023 are not necessarily indicative of the results the Company expects for the entire year. In addition, the influence of seasonality, changes in payor contracts, changes in rate per visit, changes in referral and visit volumes, strategic transactions, labor market dynamics and wage inflation, changes in laws and general economic conditions in the markets in which the Company operates and other factors impacting the Company's operations may result in any period not being comparable to the same period in previous years.

For further information regarding the Company's accounting policies and other information, the condensed consolidated financial statements should be read in conjunction with our audited consolidated financial statements and notes thereto for the year ended December 31, 2022 included in our Annual Report on Form 10-K filed with the SEC on March 16, 2023.

Liquidity and going concern

The accompanying unaudited condensed consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business within twelve months after the date that these condensed consolidated financial statements are issued.

The Company has negative operating cash flows, operating losses and net losses. For the three months ended March 31, 2023, the Company had cash flows used in operating activities of $14.2 million, operating loss of $11.4 million and net loss of $25.2 million. These results are, in part, due to recent trends experienced by the Company including a tight labor market for available physical therapy and other healthcare providers in the workforce, visit volume softness, decreases in rate per visit and increases in interest costs.

Further, based on current liquidity and projected cash use, the Company anticipates violation of its minimum liquidity covenant under its 2022 Credit Agreement (as defined in Note 8) within the next twelve months following the issuance date of the condensed consolidated financial statements as of and for the period ended March 31, 2023 (refer to Note 8 - Borrowings for further discussion of the 2022 Credit Agreement and related covenants).

These conditions and events raise substantial doubt about the Company's ability to continue as a going concern.

In addition, the report of the Independent Registered Public Accounting Firm accompanying the consolidated financial statements for the year ended December 31, 2022 contains an explanatory paragraph expressing substantial doubt about our ability to continue as a going concern. Absent an amendment or waiver, the 2022 Credit Agreement provides that the receipt of a report of the Independent Registered Public Accounting Firm containing an explanatory paragraph expressing substantial doubt about our ability to continue as a going concern could be an event of default, subject to certain exceptions. Pursuant to the Transaction Support Agreement, dated as of March 15, 2023, the First Lien Lenders have agreed that, prior to June 15, 2023 (the “Outside Closing Date”), they will forbear in the exercise of any rights, remedies, powers, privileges and defenses under the 2022 Credit Agreement arising on account of a default, alleged default or event of default (if any) resulting from the going concern explanatory paragraph in the report of the Independent Registered Public Accounting Firm accompanying the consolidated financial statements for the year ended December 31, 2022. However, if the Transaction (as defined and for which the terms are further described in Note 8) is not consummated on its terms or at all, the First Lien Lenders could claim that a default or event of default has occurred under the 2022 Credit Agreement. If such claim is not waived by the First Lien Lenders and the Company is unsuccessful in disputing any such claims (including with respect to the applicability of one of the enumerated exceptions to the 2022 Credit Agreement requirement), the Company could be considered to have an event of default after the expiration of the applicable cure periods.

15

In the event of a default, all amounts outstanding under the 2022 Credit Facility, together with any accrued interest, could then be declared immediately due and payable and could be reclassified to current in the Company's condensed consolidated financial statements for the period. A default on our obligations and an acceleration of our indebtedness by our lenders would have a material adverse impact on our business, financial condition, results of operations and cash flows, and may lead to events including bankruptcy, reorganization or insolvency.

In response to these conditions, management plans include improving operating results and cash flows and refinancing the Company's debt under its 2022 Credit Agreement.

The Company's plan to improve operating results and cash flow is dependent upon its ability to achieve its business plan to increase clinical staffing levels, improve clinician productivity, control costs and capital expenditures, increase patient visit volumes and referrals and stabilize rate per visit. There can be no assurance that it will be successful in any of these respects.

In order to refinance the Company’s debt under its 2022 Credit Agreement, the Company has agreed, subject to stockholder approval of the Transaction (as defined and for which the terms are further described in Note 8), to (i) a delayed draw new money financing in an aggregate principal amount of $25.0 million, comprised of (A) second lien PIK convertible notes (the “Notes”) and (B) shares of Series B Preferred Stock (as defined in Note 8), which will provide the holder thereof with voting rights such that the holders thereof will have the right to vote on an as-converted basis, (ii) facilitate the exchange of $100.0 million of the aggregate principal amount of the term loans under the 2022 Credit Agreement held by certain of the Preferred Equityholders for Notes and Series B preferred Stock and (iii) agree to certain other changes to the terms of the 2022 Credit Agreement, including modifications of the financial covenants thereunder. Holders of the Notes will also receive additional Notes upon the in-kind payment of interest on any outstanding Notes. The Notes will be convertible into shares of Class A common stock at a fixed conversion price.

If the Company does not consummate the Transaction on a timely basis as further described in Note 8 or otherwise access additional financing, the Company will need to consider other alternatives, including pursuing separate amendments to or waivers of the minimum liquidity covenant, the requirement to deliver audited financial statements without certain going concern qualifications, and other requirements under the 2022 Credit Agreement, as well as raising funds from other sources, obtaining alternate financing, disposal of assets, or pursuing other strategic alternatives to improve its liquidity position and business results. There can be no assurance that the Company will be successful in completing the Transaction or accessing such alternative options or financing when needed. Failure to do so could have a material adverse impact on our business, financial condition, results of operations and cash flows, and may lead to events including bankruptcy, reorganization or insolvency.

16

Management plans have not been fully implemented and, as a result, the Company has concluded that management’s plans do not alleviate substantial doubt about the Company’s ability to continue as a going concern.

The condensed consolidated financial statements do not include any adjustments relating to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that might result from the outcome of this uncertainty.

Use of estimates

The preparation of the condensed consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. The effect of any change in estimates will be recognized in the current period of the change.

Segment reporting

The Company reports segment information based on the management approach. The management approach designates the internal reporting used by management for making decisions and assessing performance as the source of the Company’s reportable segments. All of the Company’s operations are conducted within the United States. Our chief operating decision maker is our Chief Executive Officer, who reviews financial information presented on a consolidated basis for purposes of making decisions, assessing financial performance and allocating resources. We operate our business as one operating segment and therefore we have one reportable segment.

Cash, cash equivalents and restricted cash

Cash and cash equivalents include all cash balances and highly liquid investments with original maturities of three months or less when issued. Restricted cash consists of cash held as collateral in relation to the Company's corporate card agreement. Restricted cash included within cash and cash equivalents as presented within our condensed consolidated balance sheets as of March 31, 2023 and December 31, 2022, and our condensed consolidated statements of cash flows for the three months ended March 31, 2023 was $0.8 million.

Recently adopted accounting guidance

In October 2021, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Liabilities from Contracts with Customers, which provides guidance to improve the accounting for acquired revenue contracts with customers in a business combination by addressing diversity in practice. This ASU is effective for the Company on January 1, 2023, with early adoption permitted, and shall be applied on a prospective basis to business combinations that occur on or after the adoption date. The Company adopted this new accounting standard effective January 1, 2023. The adoption of this standard did not have a material impact on the Company's condensed consolidated financial statements.

Note 3. Divestitures

Clinics held for sale

During the fourth quarter of 2022, the Company classified the assets and liabilities of certain clinics as held for sale as a result of the Company's decision to sell the clinics. The divestiture transactions are anticipated to be completed within twelve months. The clinics did not meet the criteria to be classified as discontinued operations. During the first quarter of 2023, the Company completed a portion of its anticipated divestiture transactions, which were immaterial.

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Major classes of assets and liabilities classified as held for sale as of March 31, 2023 and December 31, 2022 were as follows (in thousands):

	March 31, 2023		December 31, 2022
Accounts receivable, net	$	594	$	486
Prepaid expenses	20		23
Property and equipment, net	403		1,113
Operating lease right-of-use assets	1,251		1,929
Goodwill, net	3,192		3,192
Other non-current assets	9		12
Total assets held for sale	$	5,469	$	6,755
Accounts payable	$	8	$	22
Accrued expenses and other liabilities	80		201
Current portion of operating lease liabilities	376		685
Operating lease liabilities	1,039		1,706
Total liabilities held for sale	$	1,503	$	2,614

Note 4. Revenue from Contracts with Customers

The following table disaggregates net revenue by major service line for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Net patient revenue	$	150,754	$	138,925
ATI Worksite Solutions (1)	9,201		8,651
Management Service Agreements (1)	3,725		3,155
Other revenue (1)	3,252		3,091
	$	166,932	$	153,822

(1)ATI Worksite Solutions, Management Service Agreements and Other revenue are included within other revenue on the face of the condensed consolidated statements of operations.

The following table disaggregates net patient revenue for each associated payor class as a percentage of total net patient revenue for the periods indicated below:

	Three Months Ended
	March 31, 2023		March 31, 2022
Commercial	58.1	%	56.8	%
Government	23.6	%	23.6	%
Workers’ compensation	12.0	%	13.2	%
Other (1)	6.3	%	6.4	%
	100.0	%	100.0	%

(1) Other is primarily comprised of net patient revenue related to auto personal injury.

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Note 5. Goodwill, Trade Name and Other Intangible Assets

Changes in the carrying amount of goodwill consisted of the following (in thousands):

Goodwill at December 31, 2022 (1)	$	286,458
Impairment charges (2)	—
Goodwill at March 31, 2023	$	286,458

(1) Net of accumulated impairment losses of $1,045.7 million.

(2) The Company did not note any triggering events during the three months ended March 31, 2023 that resulted in the recording of an impairment loss.

The table below summarizes the Company’s carrying amount of trade name and other intangible assets at March 31, 2023 and December 31, 2022 (in thousands):

	March 31, 2023		December 31, 2022
Gross intangible assets:
ATI trade name (1)	$	245,000	$	245,000
Non-compete agreements	2,395		2,395
Other intangible assets	640		640
Accumulated amortization:
Accumulated amortization – non-compete agreements	(1,299)		(1,126)
Accumulated amortization – other intangible assets	(338)		(327)
Total trade name and other intangible assets, net	$	246,398	$	246,582

(1) Not subject to amortization.

Amortization expense for the three months ended March 31, 2023 and 2022 was immaterial. The Company estimates that amortization expense related to intangible assets is expected to be immaterial over the next five fiscal years and thereafter.

Interim impairment testing during 2022

During the quarter ended March 31, 2022, the Company identified an interim triggering event as a result of factors including potential changes in discount rates and decreases in share price. The Company determined that the combination of these factors constituted an interim triggering event that required further analysis with respect to potential impairment to goodwill, trade name indefinite-lived intangible and other assets.

As it was determined that it was more likely than not that the fair value of our trade name indefinite-lived intangible asset was below its carrying value, the Company performed an interim quantitative impairment test as of the March 31, 2022 balance sheet date. The Company utilized the relief from royalty method to estimate the fair value of the trade name indefinite-lived intangible asset. The key assumptions associated with determining the estimated fair value included projected revenue growth rates, the royalty rate, the discount rate and the terminal growth rate. As a result of the analysis, during the three months ended March 31, 2022, the Company recognized a $39.4 million non-cash interim impairment in goodwill, intangible and other asset impairment charges in its condensed consolidated statements of operations, which represented the difference between the estimated fair value of the Company’s trade name indefinite-lived intangible asset and its carrying value.

The Company evaluated its long-lived asset groups, including operating lease right-of-use assets that were evaluated based on clinic-specific cash flows and clinic-specific market factors, noting no material impairment.

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As it was determined that it was more likely than not that the fair value of our single reporting unit was below its carrying value, the Company performed an interim quantitative impairment test with respect to goodwill. In order to determine the fair value of our single reporting unit, the Company utilized an average of a discounted cash flow analysis and comparable public company analysis. The key assumptions associated with determining the estimated fair value included projected revenue growth rates, earnings before interest, taxes, depreciation and amortization ("EBITDA") margins, the terminal growth rate, the discount rate and relevant market multiples. As a result of the analysis, during the three months ended March 31, 2022, the Company recognized a $116.3 million non-cash interim impairment in goodwill, intangible and other asset impairment charges in its condensed consolidated statements of operations, which represented the difference between the estimated fair value of the Company’s single reporting unit and its carrying value.

Fair value determinations require considerable judgment and are sensitive to changes in underlying assumptions, estimates and market factors. Estimating the fair value of the Company’s reporting unit and the indefinite-lived intangible asset requires us to make assumptions and estimates regarding our future plans, as well as industry, economic, and regulatory conditions. These assumptions and estimates include projected revenue growth rates, EBITDA margins, terminal growth rates, discount rates, relevant market multiples, royalty rates and other market factors. If current expectations of future growth rates, margins and cash flows are not met, or if market factors outside of our control change significantly, including discount rates, relevant market multiples, company share price and other market factors, then our reporting unit or the indefinite-lived intangible asset might become impaired in the future, negatively impacting our operating results and financial position. As the carrying amounts of goodwill and the Company’s trade name indefinite-lived intangible asset were impaired as of December 31, 2022 and written down to fair value, those amounts are more susceptible to an impairment risk if there are unfavorable changes in assumptions and estimates.

Note 6. Property and Equipment

Property and equipment consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):

	March 31, 2023		December 31, 2022
Equipment	$	38,170	$	38,102
Furniture and fixtures	17,334		17,215
Leasehold improvements	192,162		191,182
Automobiles	19		19
Computer equipment and software	103,954		102,651
Construction-in-progress	4,021		3,727
	355,660		352,896
Accumulated depreciation and amortization	(236,152)		(229,206)
Property and equipment, net (1)	$	119,508	$	123,690

(1) Excludes $0.4 million and $1.1 million reclassified as held for sale as of March 31, 2023 and December 31, 2022, respectively. Refer to Note 3 - Divestitures for additional information.

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The following table presents the amount of depreciation and amortization expense related to property and equipment recorded in rent, clinic supplies, contract labor and other and selling, general and administrative expenses in the Company’s condensed consolidated statements of operations for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Rent, clinic supplies, contract labor and other	$	6,458	$	7,086
Selling, general and administrative expenses	3,049		2,835
Total depreciation expense	$	9,507	$	9,921

Note 7. Accrued Expenses and Other Liabilities

Accrued expenses and other liabilities consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):

	March 31, 2023		December 31, 2022
Salaries and related costs	$	16,786	$	28,949
Accrued professional fees	7,948		5,551
Credit balances due to patients and payors	6,734		6,117
Accrued interest	6,089		762
Accrued contract labor	2,685		4,483
Accrued occupancy costs	2,350		2,410
Other payables and accrued expenses	4,972		5,400
Total	$	47,564	$	53,672

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Note 8. Borrowings

Long-term debt consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):

	March 31, 2023		December 31, 2022
Senior Secured Term Loan (1, 2) (due February 24, 2028)	$	505,217	$	503,481
Revolving Loans (3) (due February 24, 2027)	48,200		48,200
Less: unamortized debt issuance costs	(10,693)		(11,137)
Less: unamortized original issue discount	(8,587)		(8,944)
Total debt, net	534,137		531,600
Less: current portion of long-term debt	—		—
Long-term debt, net	$	534,137	$	531,600

(1) Interest rate of 12.6% and 12.1% at March 31, 2023 and December 31, 2022, respectively, with interest payable in designated installments at a variable interest rate. The effective interest rate for the Senior Secured Term Loan was 13.7% and 13.1% at March 31, 2023 and December 31, 2022, respectively.

(2) Beginning in the third quarter of 2022, the Company elected to pay a portion of its interest in-kind on its Senior Secured Term Loan by capitalizing and adding such interest to the principal amount of the debt. As of March 31, 2023, the Company recognized paid in-kind interest in the amount of $5.2 million.

(3) Interest rate of 8.8% and 8.3% at March 31, 2023 and December 31, 2022, respectively, with interest payable in designated installments at a variable interest rate.

2022 Credit Agreement

On February 24, 2022 (the "Refinancing Date"), the Company entered into various financing arrangements to refinance its previous long-term debt (the "2022 Debt Refinancing"). As part of the 2022 Debt Refinancing, ATI Holdings Acquisition, Inc. (the "Borrower"), an indirect subsidiary of ATI Physical Therapy, Inc., entered into a credit agreement among the Borrower, Wilco Intermediate Holdings, Inc. ("Holdings"), as loan guarantor, Barclays Bank PLC, as administrative agent and issuing bank, and a syndicate of lenders (the "2022 Credit Agreement"). The 2022 Credit Agreement provides a $550.0 million credit facility (the "2022 Credit Facility") that is comprised of a $500.0 million senior secured term loan (the "Senior Secured Term Loan") which was fully funded at closing and a $50.0 million "super priority" senior secured revolver (the "Revolving Loans") with a $10.0 million letter of credit sublimit.

The 2022 Credit Facility refinanced and replaced the Company's prior credit facility for which Barclays Bank PLC served as administrative agent for a syndicate of lenders. The Company paid $555.0 million to settle its previous term loan (the "2016 first lien term loan"). The Company accounted for the transaction as a debt extinguishment and recognized $2.8 million in loss on debt extinguishment during the three months ended March 31, 2022 related to the derecognition of the remaining unamortized deferred financing costs and unamortized original issue discount in conjunction with the debt repayment. The loss on debt extinguishment associated with the repayment of the 2016 first lien term loan has been reflected in other expense (income), net in the condensed consolidated statements of operations.

In connection with the 2022 Debt Refinancing, the Company also entered into a preferred stock purchase agreement, consisting of senior preferred stock with detachable warrants to purchase common stock for an aggregate stated value of $165.0 million (collectively, the “Preferred Stock Financing”). See Note 10 - Mezzanine and Stockholders' Equity for further information regarding the Preferred Stock Financing.

The Company capitalized debt issuance costs totaling $12.5 million related to the 2022 Credit Facility as well as an original issue discount of $10.0 million, which are amortized over the terms of the respective financing arrangements.

22

The Senior Secured Term Loan matures on February 24, 2028 and bears interest, at the Company's election, at a base interest rate of the Alternate Base Rate ("ABR"), as defined in the agreement, plus an applicable credit spread, or the Adjusted Term Secured Overnight Financing Rate ("SOFR"), as defined in the agreement, plus an applicable credit spread. The credit spread is determined based on a pricing grid and the Company's Secured Net Leverage Ratio. The Company may elect to pay 2.0% interest in-kind at a 0.5% premium during the first year under the agreement. The Company elected to pay a portion of its interest in-kind beginning in the third quarter of 2022. As of March 31, 2023, borrowings on the Senior Secured Term Loan bear interest at 3-month SOFR, subject to a 1.0% floor, plus 7.25% plus the 0.5% paid-in-kind interest premium.

The Revolving Loans are subject to a maximum borrowing capacity of $50.0 million and mature on February 24, 2027. Borrowings on the Revolving Loans bear interest, at the Company's election, at a base interest rate of the ABR, as defined in the agreement, plus an applicable credit spread, or the Adjusted Term SOFR Rate, as defined in the agreement, plus an applicable credit spread. The credit spread is determined based on a pricing grid and the Company's Secured Net Leverage Ratio. In December 2022, the Company drew $48.2 million in Revolving Loans. As of March 31, 2023, $48.2 million in Revolving Loans were outstanding and bearing interest at 3-month SOFR plus a credit spread of 4.1%.

The Company capitalized issuance costs of $0.5 million related to the Revolving Loans. Unamortized issuance costs of $0.2 million related to the revolving loans under the 2016 credit agreement were added to the balance of unamortized issuance costs to be amortized over the term of the Revolving Loans pursuant to debt extinguishment accounting guidance. Commitment fees on the Revolving Loans are payable quarterly at 0.5% per annum on the daily average undrawn portion for the quarter and are expensed as incurred. The balances of unamortized issuance costs related to the Revolving Loans were $0.6 million as of March 31, 2023, and $0.6 million as of December 31, 2022.

The 2022 Credit Facility is guaranteed by certain of the Company’s subsidiaries and is secured by substantially all of the assets of Holdings, the Borrower and the Borrower’s wholly owned subsidiaries, including a pledge of the stock of the Borrower, in each case, subject to customary exceptions.

The 2022 Credit Agreement contains customary covenants and restrictions, including financial and non-financial covenants. The financial covenants require the Company to maintain $30.0 million of minimum liquidity, as defined in the agreement, at each test date through the first quarter of 2024. Additionally, beginning in the second quarter of 2024, the Company must maintain a Secured Net Leverage Ratio, as defined in the agreement, not to exceed 7.00:1.00. The net leverage ratio covenant decreases in the third quarter of 2024 to 6.75:1.00 and further decreases in the first quarter of 2025 to 6.25:1.00, which remains applicable through maturity. The financial covenants are tested as of each fiscal quarter end for the respective periods. As of March 31, 2023, the Company is in compliance with its minimum liquidity financial covenant.

The 2022 Credit Facility contains customary representations and warranties, events of default, reporting and other affirmative covenants and negative covenants, including requirements related to the delivery of independent audit reports without certain going concern qualifications, limitations on indebtedness, liens, investments, negative pledges, dividends, junior debt payments, fundamental changes and asset sales and affiliate transactions. Failure to comply with the 2022 Credit Facility covenants and restrictions could result in an event of default under the 2022 Credit Facility, subject to customary cure periods. In such an event, all amounts outstanding under the 2022 Credit Facility, together with any accrued interest, could then be declared immediately due and payable.

23

Under the 2022 Credit Facility, the Company may be required to make certain mandatory prepayments upon the occurrence of certain events, including: an event of default, a prepayment asset sale or receipt of net insurance proceeds in excess of $15.0 million, or excess cash flows exceeding certain thresholds. A prepayment asset sale includes dispositions at fair market value, and net insurance proceeds is generally defined as insurance proceeds received on a covered loss or as a result of assets taken under the power of eminent domain, net of costs related to the matter.

The Company had letters of credit totaling $1.8 million and $1.8 million under the letter of credit sub-facility on the revolving credit facility as of March 31, 2023 and December 31, 2022, respectively. The letters of credit auto-renew on an annual basis and are pledged to insurance carriers as collateral.

Aggregate maturities of long-term debt at March 31, 2023 are as follows (in thousands):

2023 (remainder of year)	$	—
2024	—
2025	—
2026	—
2027	48,200
Thereafter	505,217
Total future maturities	553,417
Unamortized original issue discount and debt issuance costs	(19,280)
Total debt, net	$	534,137

Amended and Restated Transaction Support Agreement

On April 17, 2023, the Company entered into (i) an Amended and Restated Transaction Support Agreement (the "A&R TSA") to that certain Transaction Support Agreement, dated as of March 15, 2023, by and among the Company and certain of the Company’s affiliates, certain of its first lien lenders under the 2022 Credit Agreement (the “First Lien Lenders”), the administrative agent under the 2022 Credit Agreement, holders of its Series A Senior Preferred Stock (the “Preferred Equityholders”) and holders of the majority of its common stock (collectively, the “Parties”), (ii) Amendment No. 2 (the “Credit Agreement Amendment”) to the Company’s Credit Agreement, dated as of February 24, 2022, by and among the Borrower, Holdings, as loan guarantor, Barclays Bank PLC, as administrative agent and issuing bank, and the lenders party thereto (the “2022 Credit Agreement” and together with the Credit Agreement Amendment, the “Credit Agreement”), (iii) a Second Lien Note Purchase Agreement (the “Note Purchase Agreement”), by and among the Company, Wilco Holdco, Inc. (“Wilco”), Holdings, the Borrower, the purchasers from time to time party thereto (the “Purchasers”) and Wilmington Savings Fund Society, FSB, as purchaser representative and (iv) certain other definitive agreements relating to the comprehensive transaction to enhance the Company’s liquidity (the “Transaction,” and such documents referred to collectively as the “Signing Date Definitive Documents”).

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Transaction Support Agreement

The A&R TSA sets forth the principal terms of a comprehensive transaction to enhance the Company’s liquidity. Pursuant to the A&R TSA, the Company and the Parties agreed to and appended thereto substantially final forms of the remaining definitive documents (together with the Signing Date Definitive Documents, the “Definitive Documents”) and subject to the terms and conditions thereof, the Parties have agreed to support, act in good faith and take all steps reasonably necessary and desirable to consummate the transactions referenced therein by the Outside Closing Date. Specifically, the Company has agreed, subject to stockholder approval of the Transaction, to a delayed draw new money financing in which the Company (i) may cause to be issued to the Purchasers an aggregate principal amount of $25.0 million (the “Delayed Draw Amounts”) in the form of a new stapled security, comprised of (A) second lien PIK convertible notes (the “Notes”) and (B) shares of Series B Preferred Stock (the "Series B Preferred Stock"), which will provide the holder thereof with voting rights such that the holders thereof will have the right to vote on an as-converted basis as if the conversion occurred at an initial price per share equal to the average closing price for the five trading days immediately preceding the date on which the Note Purchase Agreement was signed (the “NYSE Minimum Price”), (ii) will facilitate the exchange of $100.0 million of the aggregate principal amount of the term loans under the 2022 Credit Agreement held by certain of the Preferred Equityholders for Notes and Series B Preferred Stock and (iii) will agree to certain other changes to the terms of the 2022 Credit Agreement, including modifications of the financial covenants thereunder. Holders of the Notes will also receive additional Notes upon the in-kind payment of interest on any outstanding Notes. The Notes will be convertible into shares of Class A common stock, par value $0.0001 per share, of the Company (“Common Stock”) at a fixed conversion price of $0.25 (subject to adjustment as provided in the Note Purchase Agreement, the “Conversion Price”).

In addition, as part of the Transaction, (1) the Preferred Equityholders’ preexisting rights as holders of the Company’s Series A Senior Preferred Stock to designate and elect one director to the Company’s board of directors (the “Board”) will be revised to provide that (a) the Preferred Equityholders have the right to appoint three additional directors to the Board (resulting in the right of the Preferred Equityholders to appoint a total of four directors to the Board) until such time after the closing date of the Transaction (the "Closing Date") that the Lead Purchaser (in each case, as defined in certain of the transaction agreements entered into in connection with the original issuance of the Series A Preferred Stock) ceases to hold at least 50.1% of the Series A Preferred Stock held by it as of the Closing Date, one of whom must be unaffiliated with (and independent of) the Preferred Equityholders and who must meet the definition of “independent” under the listing standards of the New York Stock Exchange, and by the SEC; and (b) all such designee directors of the Preferred Equityholders will be subject to consideration by the Board (acting in good faith and consistent with their review of other Board candidates) and (2) the provision in the certificate of designation of the Company’s Series A Senior Preferred Stock that eliminated the Preferred Equityholders’ director designation rights upon the Company’s achievement of certain amounts of EBITDA will be deleted (and the equivalent provision in that certain Investors’ Rights Agreement, dated as of February 24, 2022, by and among the Company and the Preferred Equityholders listed therein, will also be deleted).

In addition, the A&R TSA contains certain representations, warranties and other agreements by the Company and the Parties. The Company’s and the Parties’ obligations under the A&R TSA are, and the closing of the Transaction is, subject to various customary terms and conditions set forth therein, including the execution and delivery of definitive documentation and approval by the Company’s stockholders.

25

Credit Agreement Amendment

The Credit Agreement Amendment provides, among other things, (i) a reduction of the thresholds applicable to the minimum liquidity financial covenant under the 2022 Credit Agreement for certain periods, (ii) a waiver of the requirement to comply with the Secured Net Leverage Ratio financial covenant under the 2022 Credit Agreement for the fiscal quarters ending June 30, 2024, September 30, 2024 and December 31, 2024 and a modification of the levels and certain component definitions applicable thereto in the fiscal quarters ending after December 31, 2024, (iii) an extension of the minimum liquidity financial covenant for the fiscal quarters in which the Secured Net Leverage Ratio financial covenant was waived, (iv) a waiver of the requirement for the Company to deliver audited financial statements without certain going concern qualifications for the years ended December 31, 2022, December 31, 2023, and December 31, 2024, (v) an increase in the interest rate payable on the existing term loans and revolving loans until the achievement of a specified financial metric and (vi) board representation and observer rights and other changes to the governance of the Company.

Note Purchase Agreement and Series B Preferred Stock

The Note Purchase Agreement contains customary representations, warranties, conditions and indemnification obligations by each party thereto. The representation, warranties and covenants contained therein were made only for the purposes of the Note Purchase Agreement, and as of specific dates, were solely for the benefit of the parties to such agreement and are subject to certain limitations set forth therein.

Draws. Draws on the Delayed Draw Amounts will be available beginning immediately on the Closing Date and ending on the date that is 18 months after the Closing Date, the Company may request either (i) two draws in an amount of $12.5 million each, or (ii) one draw in an amount of $25.0 million, subject in each case to, (a) projected liquidity at any time during the 6-month period following the date of the relevant draw being below either (i) $20 million or (ii) the prevailing minimum liquidity covenant threshold, as determined by reference to the Credit Agreement and (b) the consent of at least a majority of the disinterested directors on our Board. The Note Purchase Agreement also provides, subject to certain conditions (including the receipt of commitments therefor) and consent rights outlined in the Note Purchase Agreement for the ability of the Company to issue up to an additional $150.0 million in Notes. Proceeds of the Notes may be used for general corporate purposes, subject to certain exceptions.

Interest. The Notes will bear interest at a rate of 8.00% per annum, payable quarterly in-kind in the form of additional Notes by capitalizing the amount of such interest on the outstanding principal balance of the Notes in arrears on each interest payment date.

Maturity. The Notes will mature on August 24, 2028, unless earlier repurchased or converted.

Conversion. The Notes may be converted, in whole or in part (if the portion to be converted is $1,000 principal amount or an integral multiple thereof), at the option of the holder, into shares of Common Stock based on the Conversion Price.

Forced Conversion. On or after the second anniversary of the Closing Date, the Company may, at its option, from time to time, elect to convert a portion of the outstanding Notes into the number of shares of Common Stock issuable upon conversion based on the Conversion Price then in effect, subject in each case to the satisfaction of the conditions contained in the Note Purchase Agreement.

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Adjustments to Conversion Price. The Conversion Price is subject to adjustment as a result of certain events including, but not limited to, certain issuances of Common Stock as a dividend or distribution, issuances of rights, options or warrants to purchase Common Stock at a price per share less than the average closing price per share of Common Stock for the ten trading days preceding the date of announcement of such issuance, effecting a share split or combination of the shares of Common Stock, issuance of a cash dividend or distribution and other issuances for a consideration per share less than the Conversion Price.

Guarantees; Collateral; Ranking. The Notes will be guaranteed by Wilco, Holdings, the Borrower, and the subsidiaries of ATI Holdings Acquisition, Inc. that guaranty the obligations under the Credit Agreement. The Notes will be secured by the same collateral that secures the obligations under the Credit Agreement.

Pursuant to the terms of an intercreditor and subordination agreement, the Notes (and the guarantees thereof) will rank junior in right of payment to the obligations under the Credit Agreement, and the liens on the collateral securing the Notes will rank junior to the liens on such collateral securing the obligations under the Credit Agreement.

Other Covenants. The Note Purchase Agreement includes affirmative and negative covenants (other than financial covenants) that are substantially consistent with the Credit Agreement, as well as customary events of default.

Voting. The Company will issue to each holder of Notes shares of Series B Preferred Stock in an amount equal to the quotient (rounded down to the nearest whole number) obtained by dividing (A) the amount paid by such holder to the Company for the Notes by (B) $1,000, resulting in more votes per share of Series B Preferred Stock than one share of Common Stock. Notwithstanding that one share of Series B Preferred Stock shall represent more votes than one share of Common Stock, the holders of shares of Series B Preferred Stock shall have full voting rights and powers equal to the voting rights and powers of the holders of Common Stock, and shall be entitled to notice of any stockholders' meeting in accordance with the bylaws of the Company, shall be entitled to vote, together with holders of Common Stock, with respect to any question upon which holders of Common Stock have the right to vote. Fractional votes shall not, however, be permitted, and any fractional voting rights available on an as-converted basis (after aggregating all shares into which shares of Series B Preferred Stock held by each holder could be converted) shall be rounded down to the nearest whole share of Series B Preferred Stock.

The Series B Preferred Stock shall not have any dividend or redemption rights and, in the event of any voluntary or involuntary liquidation, dissolution or winding up of the Company, the holders of Series B Preferred Stock shall be entitled to be paid out of the assets of the Company available for distribution to its stockholders, after satisfying any senior payment obligations and before any payment in respect of any Common Stock, an amount per share of Series B Preferred Stock equal to $0.0001.

The Series B Preferred Stock shall be governed in all respects by Delaware law.

The Transaction is subject to the execution of the Definitive Documents, as well as customary closing conditions. In addition, the closing of the Transaction and the matters contemplated by each of the A&R TSA, Credit Agreement Amendment and Note Purchase Agreement, are subject in each case to approval by the Company’s stockholders.

There is no assurance that the Transaction will be consummated on the terms as described above, on a timely basis or at all.

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Note 9. Share-Based Compensation

The Company recognizes compensation expense for all share-based compensation awarded to employees, net of forfeitures, using a fair value-based method. The grant-date fair value of each award is amortized to expense on a straight-line basis over the award’s vesting period. Compensation expense associated with share-based awards is included in salaries and related costs and selling, general and administrative expenses in the accompanying condensed consolidated statements of operations, depending on whether the award recipient is a clinic-level or corporate employee, respectively. Share-based compensation expense is adjusted for forfeitures as incurred.

ATI 2021 Equity Incentive Plan

The Company adopted the ATI Physical Therapy 2021 Equity Incentive Plan (the "2021 Plan") under which it may grant equity interests of ATI Physical Therapy, Inc., in the form of stock options, stock appreciation rights, restricted stock awards and restricted stock units, to members of management, key employees and independent directors of the Company and its subsidiaries. The Compensation Committee is authorized to make grants and to make various other decisions under the 2021 Plan. The maximum number of shares reserved for issuance under the 2021 Plan is approximately 21.3 million. The Company intends to amend, subject to stockholder approval, the 2021 Plan to increase the share reserve by 37.0 million Class A common shares. If approved, approximately 12.0 million shares would have been available for future grant as of March 31, 2023.

2023 grants

During the three months ended March 31, 2023, the Company granted restricted stock units ("RSUs") to certain employees and independent directors of the Company, which are subject to stockholder approval of an increase to the share reserve under the 2021 Plan. For the three months ended March 31, 2023, approximately 36.3 million RSUs were granted under the 2021 Plan. The weighted-average grant date fair values related to the RSUs granted were $0.34.

As of March 31, 2023, the unrecognized compensation expense related to outstanding RSUs was $16.6 million, to be recognized over a weighted-average period of 2.6 years.

Total non-cash share-based compensation expense recognized in the three months ended March 31, 2023 was approximately $1.5 million.

Note 10. Mezzanine and Stockholders' Equity

ATI Physical Therapy, Inc. Series A Senior Preferred Stock

In connection with the 2022 Debt Refinancing, the Company issued 165,000 shares of non-convertible preferred stock (the "Series A Senior Preferred Stock") plus 5.2 million warrants to purchase shares of the Company's common stock at an exercise price of $3.00 per share (the "Series I Warrants") and warrants to purchase 6.3 million shares of the Company's common stock at an exercise price equal to $0.01 per share (the "Series II Warrants"). The shares of the Series A Senior Preferred Stock have a par value of $0.0001 per share and an initial stated value of $1,000 per share, for an aggregate initial stated value of $165.0 million. The Company is authorized to issue 1.0 million shares of preferred stock per the Certificate of Designation. As of March 31, 2023, there was 0.2 million shares of Series A Senior Preferred Stock issued and outstanding.

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The gross proceeds received from the issuance of the Series A Senior Preferred Stock and the Series I and Series II Warrants were $165.0 million, which was allocated among the instruments based on the relative fair values of each instrument. Of the gross proceeds, $144.7 million was allocated to the Series A Senior Preferred Stock, $5.1 million to the Series I Warrants and $15.2 million to the Series II Warrants. The resulting discount on the Series A Senior Preferred Stock will be recognized as a deemed dividend when those shares are subsequently remeasured upon becoming redeemable or probable of becoming redeemable. The Company recognized $2.9 million in issuance costs and $1.4 million of original issue discount related to the Series A Senior Preferred Stock.

The following table reflects the components of proceeds related to the Series A Senior Preferred Stock (in thousands):

Gross proceeds allocated to Series A Senior Preferred Stock	$	144,667
Less: original issue discount	(1,447)
Less: issuance costs	(2,880)
Net proceeds received from issuance of Series A Senior Preferred Stock	$	140,340

The Series A Senior Preferred Stock has priority over the Company's Class A common stock and all other junior equity securities of the Company, and is junior to the Company's existing or future indebtedness and other liabilities (including trade payables), with respect to payment of dividends, distribution of assets, and all other liquidation, winding up, dissolution, dividend and redemption rights.

The Series A Senior Preferred Stock carries an initial dividend rate of 12.0% per annum (the "Base Dividend Rate"), payable quarterly in arrears. Dividends will be paid in-kind and added to the stated value of the Series A Senior Preferred Stock. The Company may elect to pay dividends on the Series A Senior Preferred Stock in cash beginning on the third anniversary of the Refinancing Date and, with respect to any such dividends paid in cash, the dividend rate then in effect will be decreased by 1.0%.

The Base Dividend Rate is subject to certain adjustments, including an increase of 1.0% per annum on the first day following the fifth anniversary of the Refinancing Date and on each one-year anniversary thereafter, and 2.0% per annum upon the occurrence of either an Event of Noncompliance (as defined in the Certificate of Designation) or a failure by the Company to redeem in full all Series A Senior Preferred Stock upon a Mandatory Redemption Event, which includes a change of control, liquidation, bankruptcy or certain restructurings. The paid in-kind dividends related to the Series A Preferred Stock were $5.3 million and $1.9 million for the three months ended March 31, 2023 and 2022, respectively. As of March 31, 2023, the accumulated paid in-kind dividends related to the Series A Preferred Stock were $23.2 million and the aggregate stated value was $188.2 million.

Changes in the aggregate stated value and stated value per share of the Series A Senior Preferred Stock consisted of the following (in thousands, except per share data):

	March 31, 2023		December 31, 2022
Aggregate stated value, beginning of period	$	182,876	$	165,000
Paid in-kind dividends(1)	5,303		17,876
Aggregate stated value, end of period	$	188,179	$	182,876
Preferred shares issued and outstanding, end of period	165		165
Stated value per share, end of period	$	1,140.48	$	1,108.34

(1) Changes in the stated value for the year ended December 31, 2022 represent changes since the Refinancing Date, which is when the Series A Senior Preferred Stock was issued and established.

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The Company has the right to redeem the Series A Senior Preferred Stock, in whole or in part, at any time (subject to certain limitations on partial redemptions). The Redemption Price for each share of Series A Senior Preferred Stock is equal to the stated value subject to certain price adjustments depending on when such optional redemption takes place, if at all.

The Series A Senior Preferred Stock is perpetual and is not mandatorily redeemable at the option of the holders, except upon the occurrence of a Mandatory Redemption Event. Upon the occurrence of a Mandatory Redemption Event, to the extent not prohibited by law, the Company is required to redeem all Series A Senior Preferred Stock, in cash, at a price per share equal to the then applicable Redemption Price. Because the Series A Senior Preferred Stock is mandatorily redeemable contingent on certain events outside the Company’s control, such as a change in control, the Series A Senior Preferred Stock is classified as mezzanine equity in the Company's condensed consolidated balance sheets. Based on the Company’s assessment of the conditions which would trigger the redemption of the Series A Senior Preferred Stock, the Company has determined that the Series A Senior Preferred Stock is neither currently redeemable nor probable of becoming redeemable. Because the Series A Senior Preferred Stock is classified as mezzanine equity and is not considered redeemable or probable of becoming redeemable, the paid in-kind dividends that are added to the stated value do not impact the carrying value of the Series A Senior Preferred Stock in the Company’s condensed consolidated balance sheets. Should the Series A Senior Preferred Stock become probable of becoming redeemable, the Company will recognize changes in the redemption value of the Series A Senior Preferred Stock immediately as they occur and adjust the carrying amount accordingly at the end of each reporting period. As of March 31, 2023, the redemption value of the Series A Senior Preferred Stock was $188.2 million, which is the stated value.

If an Event of Noncompliance occurs, then the holders of a majority of the then outstanding shares of Series A Senior Preferred Stock (the “Majority Holders”) have the right to demand that the Company engage in a sale/refinancing process to consummate a Forced Transaction. A Forced Transaction includes a refinancing of the Series A Senior Preferred Stock or a sale of the Company. Upon consummation of any Forced Transaction, to the extent not prohibited by law, the Company is required to redeem all Series A Senior Preferred Stock, in cash, at a price per share equal to the then applicable Redemption Price.

Holders of shares of Series A Senior Preferred Stock have no voting rights with respect to the Series A Senior Preferred Stock except as set forth in the Certificate of Designation, other documents entered into in connection with the Purchase Agreement and the transactions contemplated thereby, or as otherwise required by law. For so long as any Series A Senior Preferred Stock is outstanding, the Company is prohibited from taking certain actions without the prior consent of the Majority Holders as set forth in the Certificate of Designation which include: issuing equity securities ranking senior to or pari passu with the Series A Senior Preferred Stock, incurring indebtedness or liens, engaging in affiliate transactions, making restricted payments, consummating certain investments or asset dispositions, consummating a change of control transaction unless the Series A Senior Preferred Stock is redeemed in full, altering the Company’s organizational documents, and making material changes to the nature of the Company’s business.

Holders of Series A Senior Preferred Stock, voting as a separate class, have the right to designate and elect one director to serve on the Company’s board of directors until such time after the Refinancing Date that (i) as of any applicable fiscal quarter end, the Company’s trailing 12-month Consolidated Adjusted EBITDA (as defined in the Certificate of Designation) exceeds $100 million, or (ii) the Lead Purchaser ceases to hold at least 50.1% of the Series A Senior Preferred Stock held by it as of the Refinancing Date.

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2022 Warrants

In connection with the Preferred Stock Financing, the Company agreed to issue to the preferred stockholders the Series I Warrants entitling the holders thereof to purchase 5.2 million shares of the Company's common stock at an exercise price equal to $3.00 per share, exercisable for 5 years from the Refinancing Date; and the Series II Warrants entitling holders thereof to purchase 6.3 million shares of the Company's common stock, at an exercise price equal to $0.01 per share, exercisable for 5 years from the Refinancing Date (collectively, the "2022 Warrants"). Such number of shares of common stock purchasable pursuant to the 2022 Warrant Agreement and related exercise prices may be adjusted from time to time under certain scenarios as set forth in the 2022 Warrant Agreement, which relate to potential changes in the Company's capital structure.

The 2022 Warrants are classified as equity instruments and were initially recorded at an amount equal to the proceeds received from the Preferred Stock Financing allocated among the Series A Senior Preferred Stock, the Series I Warrants, and the Series II Warrants based upon their relative fair values. Of the gross proceeds, $5.1 million was allocated to the Series I Warrants and $15.2 million was allocated to the Series II Warrants. The Company recognized total issuance costs and original issue discount of approximately $0.2 million and $0.5 million related to the Series I Warrants and Series II Warrants, respectively.

The following table reflects the components of proceeds related to the 2022 Warrants (in thousands):

	Series I Warrants		Series II Warrants		Total
Gross proceeds allocated to 2022 Warrants	$	5,101	$	15,232	$	20,333
Less: original issue discount	(51)		(152)		(203)
Less: issuance costs	(102)		(303)		(405)
Net proceeds received from issuance of 2022 Warrants	$	4,948	$	14,777	$	19,725

Class A common stock

The Company is authorized to issue 470.0 million shares of Class A common stock with a par value of $0.0001 per share. Holders of the Company’s Class A common stock are entitled to one vote for each share on each matter on which they are entitled to vote. At March 31, 2023, there were 208.7 million shares of Class A common stock issued and 199.5 million shares outstanding.

As of March 31, 2023, shares of Class A common stock reserved for potential future issuance, on an as-if converted basis, were as follows (in thousands):

	March 31, 2023
Shares available for grant under the 2021 Plan(1)	12,041
2021 Plan share-based awards outstanding(2)	44,239
Earnout Shares reserved	15,000
2022 Warrants outstanding	11,498
IPO Warrants outstanding	9,867
Vesting Shares reserved(3)	8,625
Restricted shares(3)	364
Total shares of common stock reserved	101,634

(1) Represents shares of Class A common stock available for grant if the proposed increase to 2021 Plan share reserve and 2023 grants are approved by stockholders. Refer to Note 9 - Share-Based Compensation for further details.

(2) Represents share-based awards outstanding under the 2021 Plan if the proposed increase to 2021 Plan share reserve and 2023 grants are approved by stockholders. Refer to Note 9 - Share-Based Compensation for further details.

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(3) Represents shares of Class A common stock legally issued, but not outstanding, as of March 31, 2023.

Treasury stock

During the three months ended March 31, 2023, the Company net settled 0.16 million shares of its Class A common stock related to employee tax withholding obligations associated with the Company's share-based compensation program. These shares are reflected at cost as treasury stock in the condensed consolidated financial statements. As of March 31, 2023, there were 0.24 million shares of treasury stock totaling $0.2 million recognized in the condensed consolidated balance sheets.

Note 11. IPO Warrant Liability

The Company has outstanding public warrants to purchase an aggregate of 6.9 million shares of the Company’s Class A common stock at an exercise price of $11.50 per share ("Public Warrants") and outstanding private placement warrants to purchase an aggregate of 3.0 million shares of the Company's Class A common stock at an exercise price of $11.50 per share ("Private Placement Warrants") (collectively, the "IPO Warrants"). There were no IPO Warrants exercised during the three months ended March 31, 2023.

The Company accounts for its outstanding IPO Warrants in accordance with the guidance contained in ASC 815-40, Derivatives and Hedging - Contracts on an Entity’s Own Equity, and determined that the IPO Warrants do not meet the criteria for equity treatment thereunder. As such, each IPO Warrant must be recorded as a liability and is subject to re-measurement at each balance sheet date. Refer to Note 13 - Fair Value Measurements for further details. Changes in fair value are recognized in change in fair value of warrant liability in the Company’s condensed consolidated statements of operations.

The following table presents the change in the fair value of Private Placement Warrants that is recognized in change in fair value of warrant liability in the condensed consolidated statements of operations for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Fair value, beginning of period	$	29	$	1,305
Increase (decrease) in fair value	60		(504)
Fair value, end of period	$	89	$	801

The following table presents the changes in the fair value of the Public Warrants that is recognized in change in fair value of warrant liability in the condensed consolidated statements of operations for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Fair value, beginning of period	$	69	$	3,036
Increase (decrease) in fair value	138		(1,173)
Fair value, end of period	$	207	$	1,863

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Note 12. Contingent Common Shares Liability

Earnout Shares

Subject to the terms and conditions of the merger agreement between Wilco Holdco, Inc. and Fortress Value Acquisition Corp. II (herein referred to as "FAII" and "FVAC"), certain stockholders of Wilco Holdco, Inc. were provided the contingent right to receive, in the aggregate, up to 15.0 million shares of Class A common stock if, from the closing of the Company's business combination with FAII until the 10th anniversary thereof, the dollar volume-weighted average price (“VWAP”) of Class A common stock exceeds certain thresholds (the "Earnout Shares"). The Earnout Shares vest in three equal tranches of 5.0 million shares each if the VWAP of Class A common stock exceeds $12.00, $14.00 and $16.00 per share, respectively, over the designated period of time.

The Earnout Shares are subject to acceleration in the event of a sale or other change in control if the holders of Class A common stock would receive a per share price in excess of the applicable Earnout Shares price target. The Company accounts for the potential Earnout Shares as a liability in accordance with the guidance in ASC 480, Distinguishing Liabilities from Equity, and ASC 815, Derivatives and Hedging, and is subject to re-measurement at each balance sheet date. Changes in fair value are recognized in the Company’s condensed consolidated statements of operations. As of March 31, 2023, no Earnout Shares have been issued as none of the corresponding share price thresholds have been met.

The following table presents the changes in the fair value of the Earnout Shares that is recognized in change in fair value of contingent common shares liability in the condensed consolidated statements of operations for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Fair value, beginning of period	$	1,800	$	28,800
Decrease in fair value	(450)		(15,450)
Fair value, end of period	$	1,350	$	13,350

Refer to Note 13 - Fair Value Measurements for further details.

Vesting Shares

Subject to the terms and conditions of the sponsor letter agreement that was executed in connection with the merger agreement between Wilco Holdco, Inc. and FAII, 8.6 million shares of Class F common stock of FAII outstanding immediately prior to the Company's business combination with FAII converted to potential Class A common shares and became subject to vesting and forfeiture provisions (the "Vesting Shares"). The Vesting Shares vest in three equal tranches of 2.9 million shares each if the VWAP of Class A common stock exceeds $12.00, $14.00 and $16.00 per share, respectively, over the designated period of time. The Vesting Shares are subject to acceleration in the event of a sale or other change in control if the holders of Class A common stock would receive a per share price in excess of the applicable Vesting Shares price target.

The Company accounts for the Vesting Shares as a liability in accordance with the guidance in ASC 480, Distinguishing Liabilities from Equity, and ASC 815, Derivatives and Hedging, and is subject to re-measurement at each balance sheet date. Changes in fair value are recognized in the Company’s condensed consolidated statements of operations. As of March 31, 2023, no Vesting Shares are outstanding as none of the corresponding share price thresholds have been met.

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The following table presents the changes in the fair value of the Vesting Shares that is recognized in change in fair value of contingent common shares liability in the condensed consolidated statements of operations for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Fair value, beginning of period	$	1,035	$	16,560
Decrease in fair value	(259)		(8,884)
Fair value, end of period	$	776	$	7,676

Refer to Note 13 - Fair Value Measurements for further details.

Note 13. Fair Value Measurements

The Company determines fair value measurements used in its condensed consolidated financial statements based upon the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels, with Level 1 having the highest priority and Level 3 having the lowest.

•Level 1: Observable inputs, which include unadjusted quoted prices in active markets for identical instruments.

•Level 2: Observable inputs other than Level 1 inputs, such as quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the instruments.

•Level 3: Unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions, such as valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.

As of March 31, 2023 and December 31, 2022, respectively, the recorded values of cash and cash equivalents, accounts receivable, other current assets, accounts payable, accrued expenses and deferred revenue approximate their fair values due to the short-term nature of these items. Money market funds categorized in Level 1 of the fair value hierarchy are measured at fair value based on quoted market prices. As of March 31, 2023 and December 31, 2022, respectively, the fair value of money market fund investments included in cash and cash equivalents was zero and $30.0 million.

The Company's Senior Secured Term Loan and Revolving Loans are Level 2 fair value measures which have variable interest rates and, as of March 31, 2023, the recorded amounts approximate fair value. The Company utilizes the market approach valuation technique based on interest rates and credit data that are currently available to the Company for issuance of debt with similar terms or maturities.

Fair value measurement of share-based financial liabilities

The Company determined the fair value of the Public Warrant liability using Level 1 inputs.

The Company determined the fair value of the Private Placement Warrant liability using the price of the Public Warrants as a Level 2 input.

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The Company determined the fair value of the Earnout Shares liability and Vesting Shares liability using Level 3 inputs. The contingent common shares contain specific market conditions to determine whether the shares vest based on the Company’s common stock price over a specified measurement period. Given the path-dependent nature of the requirement in which the shares are earned, a Monte-Carlo simulation was used to estimate the fair value of the liability. The Company’s common stock price was simulated to each measurement period based on the above methodology. In each iteration, the simulated stock price was compared to the conditions under which the shares vest. In iterations where the stock price corresponded to shares vesting, the future value of the contingent common shares was discounted back to present value. The fair value of the liability was estimated based on the average of all iterations of the simulation.

Inherent in a Monte-Carlo valuation model are assumptions related to expected stock-price volatility, expected term, risk-free interest rate and dividend yield. The Company estimates the volatility based on the historical volatility of certain guideline companies as of the valuation date. The risk-free interest rate is based on the U.S. Treasury zero-coupon yield curve on the grant date for a maturity similar to the expected term of the Earnout Shares and Vesting Shares. The dividend yield percentage is zero based on the Company's current expectations related to the payment of dividends during the expected term of the Earnout Shares or Vesting Shares.

The key inputs into the Monte-Carlo option pricing model were as follows as of March 31, 2023 and December 31, 2022 for the respective Level 3 instruments:

	Earnout Shares		Vesting Shares
	March 31, 2023	December 31, 2022	March 31, 2023	December 31, 2022
Risk-free interest rate	3.49%	3.88%	3.49%	3.88%
Volatility	77.30%	74.60%	77.30%	74.60%
Dividend yield	—%	—%	—%	—%
Expected term (years)	8.2	8.5	8.2	8.5
Share price	$0.25	$0.31	$0.25	$0.31

Refer to Note 12 - Contingent Common Shares Liability for further details on the change in fair value of the Earnout Shares and Vesting Shares.

Fair value measurement of interest rate derivative instruments

The Company is exposed to interest rate variability with regard to its existing variable-rate debt instrument, which exposure primarily relates to movements in various interest rates, such as SOFR. The Company utilizes interest rate cap derivative instruments for purposes of hedging exposures related to such variable-rate cash payments. The Company's interest rate caps are designated as cash flow hedging instruments.

The Company records derivatives on the balance sheet at fair value, which represents the estimated amounts it would receive or pay upon termination of the derivative prior to the scheduled expiration date. The fair value is derived from model-driven information based on observable Level 2 inputs, such as the London InterBank Offered Rate ("LIBOR") or SOFR forward rates. For derivatives designated and that qualify as cash flow hedges of interest rate risk, the gain or loss on the derivative is recorded in accumulated other comprehensive income and subsequently reclassified into interest expense in the same period(s) during which the hedged transaction affects earnings.

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The following table presents the activity of cash flow hedges included in accumulated other comprehensive income (loss) for the three months ended March 31, 2023 and 2022, respectively (in thousands):

	Cash Flow Hedges
Balance as of December 31, 2022	$	4,899
Unrealized loss recognized in other comprehensive income before reclassifications	(99)
Reclassification to interest expense, net	(3,357)
Balance as of March 31, 2023	$	1,443
Balance as of December 31, 2021	$	28
Unrealized gain recognized in other comprehensive income before reclassifications	3,681
Reclassification to interest expense, net	71
Balance as of March 31, 2022	$	3,780

The following table presents the fair value of derivative assets and liabilities within the condensed consolidated balance sheets as of March 31, 2023 and December 31, 2022 (in thousands):

	March 31, 2023				December 31, 2022
	Assets		Liabilities		Assets		Liabilities
Derivatives designated as cash flow hedging instruments:
Other current assets	$	1,708	—		$	5,028	—
Other non-current assets	—		—		—		—
Accrued expenses and other liabilities	—		—		—		—
Other non-current liabilities	—		$	237	—		$	73

Note 14. Income Taxes

The effective tax rate and income tax expense for the three months ended March 31, 2023 were (0.2)% and $0.1 million, compared to an effective tax rate and income tax benefit of 14.4% and $23.3 million for the three months ended March 31, 2022.

The effective tax rate for the three months ended March 31, 2023 was estimated based on full-year 2023 forecast. The estimated effective tax rate was different than the statutory rate primarily due to the recognition of valuation allowances against federal and state net operating losses and other tax attributes, such as interest disallowances, for which future realization is uncertain. The estimated effective tax rate applicable to year-to-date losses as adjusted for discrete items including nontaxable fair value adjustments related to liability-classified share-based instruments, resulted in a tax expense of $0.1 million for the three months ended March 31, 2023.

The effective tax rate for the three months ended March 31, 2022 was estimated based on full-year 2022 forecast. The estimated effective tax rate was different than the statutory rate primarily due to book impairment of goodwill. There was no tax basis established in a significant component of the goodwill impaired. As a result, the impairment had a substantial permanent impact on the effective tax rate. The estimated effective tax rate applicable to year-to-date losses as adjusted for discrete items resulted in a tax benefit of $23.3 million for the three months ended March 31, 2022.

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In evaluating the Company's ability to recover deferred income tax assets, all available positive and negative evidence is considered, including scheduled reversal of deferred tax liabilities, operating results and forecasts of future taxable income in each of the jurisdictions in which the Company operates. As of March 31, 2023, the Company determined that a significant portion of its federal and state net operating loss carryforwards with definite and certain indefinite carryforward periods and certain deferred tax assets are not more likely than not to be realized based on the weight of available evidence. As a result, the Company did not record a tax benefit against its current year losses due to the continued need for a valuation allowance.

Note 15. Leases

The Company leases various facilities and office equipment for its physical therapy operations and administrative support functions under operating leases. The Company’s initial operating lease terms are generally between 7 and 10 years, and typically contain options to renew for varying terms. Right-of-use ("ROU") assets and lease liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. The amortization of operating lease ROU assets and the accretion of operating lease liabilities are reported together as fixed lease expense. The fixed lease expense is recognized on a straight-line basis over the life of the lease. If the ROU asset has been impaired, lease expense is no longer recognized on a straight-line basis. The lease liability continues to amortize using the effective interest method, while the ROU asset is subsequently amortized on a straight-line basis.

Lease costs are included as components of cost of services and selling, general and administrative expenses on the condensed consolidated statements of operations. Lease charges related to ROU asset impairments are included in goodwill, intangible and other asset impairment charges on the condensed consolidated statements of operations. Lease costs incurred by lease type were as follows for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Lease cost
Operating lease cost	$	16,689	$	16,703
Variable lease cost (1)	5,362		5,205
Total lease cost (2)	$	22,051	$	21,908

(1) Includes short term lease costs, which are immaterial.

(2) Sublease income was immaterial.

During the three months ended March 31, 2023 and 2022, the Company modified the lease terms for a significant number of its real estate leases, primarily related to lease term extensions and renewals in the normal course of business. Modifications during the years ended March 31, 2023 and 2022 resulted in an increase to the Company’s operating lease ROU assets and operating lease liabilities of approximately $5.9 million and $5.7 million, respectively.

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Other supplemental quantitative disclosures were as follows for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	13,133	$	16,438
Right-of-use assets obtained in exchange for new operating lease liabilities	$	4,898	$	5,142

Average lease terms and discount rates as of March 31, 2023 and December 31, 2022 were as follows:

	March 31, 2023	December 31, 2022
Weighted-average remaining lease term:
Operating leases	5.8 years	5.9 years
Weighted-average discount rate:
Operating leases	7.1%	6.9%

Estimated undiscounted future lease payments under non-cancellable operating leases, along with a reconciliation of the undiscounted cash flows to operating lease liabilities, respectively, at March 31, 2023 were as follows (in thousands):

Year	Amount(1)
2023 (remainder of year)	$	51,578
2024	64,446
2025	54,923
2026	48,378
2027	37,201
Thereafter	73,641
Total undiscounted future cash flows	330,167
Less: Imputed Interest	(61,860)
Present value of future cash flows	$	268,307
Presentation on Balance Sheet:
Current	$	51,911
Non-current	$	216,396

(1) Excludes $0.4 million of current portion of operating lease liabilities and $1.0 million of operating lease liabilities, respectively, reclassified as held for sale as of March 31, 2023. Refer to Note 3 - Divestitures for additional information.

Note 16. Commitments and Contingencies

The Company has contractual commitments that are not required to be recognized in the condensed consolidated financial statements related to cloud computing and telecommunication services agreements. As of March 31, 2023, minimum amounts due under these agreements are approximately $15.2 million through January of 2026 subject to customary business terms and conditions.

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From time to time, the Company is a party to legal proceedings, governmental audits and investigations that arise in the ordinary course of business. Management is not aware of any legal proceedings, governmental audits and investigations of which the outcome is probable to have a material adverse effect on the Company’s results of operations, cash flows or financial condition. The outcome of any litigation and claims against the Company cannot be predicted with certainty, and the resolution of current or future claims could materially affect our future results of operations, cash flows or financial condition.

Section 205 proceeding

On March 2, 2023, we filed a petition in the Delaware Court of Chancery (the "Court of Chancery") pursuant to Section 205 of the Delaware General Corporation Law ("DGCL"), seeking validation of an amendment to our certificate of incorporation increasing the authorized shares of our Class A Common Stock (as further described below) and the shares issued pursuant thereto.

At a special meeting of the stockholders of the Company held on June 15, 2021 (the “Special Meeting”), a majority of the then-outstanding shares of the Company’s Class A Common Stock and Class F Common Stock, voting together as a single class, voted to approve the Company’s Second Amended and Restated Certificate of Incorporation, which, among other things, increased the authorized shares of the Company’s Class A Common Stock from 200,000,000 shares to 450,000,000 shares (the “Class A Increase Amendment”). Notwithstanding the fact that the proxy statement relating to the Special Meeting did not disclose that a separate vote of the Class A Common Stock was required, a majority of the then-outstanding shares of Class A Common Stock voted in favor of the Class A Increase Amendment.

A recent decision of the Court of Chancery has created uncertainty regarding the validity of the Class A Increase Amendment and whether a separate vote of the majority of the then-outstanding shares of Class A Common Stock would have been required under Section 242(b)(2) of the DGCL.

The Company continues to believe that a separate vote of Class A Common Stock was not required to approve the Class A Increase Amendment. However, in light of the recent Court of Chancery decision, the Company filed a petition in the Court of Chancery pursuant to Section 205 of the DGCL seeking validation of the Class A Increase Amendment and the shares issued pursuant thereto to resolve any uncertainty with respect to those matters. Section 205 of the DGCL permits the Court of Chancery, in its discretion, to validate potentially defective corporate acts and stock after considering a variety of factors.

On March 3, 2023, the Court of Chancery granted the motion to expedite and set a hearing date for the petition to be heard. On March 17, 2023, the Court of Chancery heard and orally granted the petition. On March 17, 2023, the Court of Chancery issued a final order granting the petition, thereby validating the Class A Increase Amendment and all shares of capital stock of the Company issued in reliance on the Class A Increase Amendment, eliminating the previous uncertainty that had been introduced by a recent decision of the Court of Chancery regarding the validity of those provisions.

Stockholder class action complaints

On August 16, 2021, two purported ATI stockholders, Kevin Burbige and Ziyang Nie, filed a putative class action complaint in the U.S. District Court for the Northern District of Illinois against ATI, Labeed Diab, Joe Jordan, and Drew McKnight (collectively, the “ATI Individual Defendants”), and Joshua Pack, Marc Furstein, Leslee Cowen, Aaron Hood, Carmen Policy, Rakefet Russak-Aminoach, and Sunil Gulati (collectively, the “FVAC Defendants”).

On October 7, 2021, another purported ATI stockholder, City of Melbourne Firefighters' Retirement System ("City of Melbourne"), filed a nearly identical putative class action complaint in the U.S. District Court for the Northern District of Illinois against ATI, the ATI Individual Defendants, and the FVAC Defendants. On November 18, 2021, the court consolidated the cases and appointed The Phoenix Insurance Company Ltd. and The Phoenix Pension & Provident Funds as lead plaintiffs (together, “Lead Plaintiffs”).

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On February 8, 2022, Lead Plaintiffs filed a consolidated amended complaint against ATI, the ATI Individual Defendants, and the FVAC Defendants, which asserts claims against (i) ATI and the ATI Individual Defendants under Section 10(b) of the Exchange Act; (ii) the ATI Individual Defendants under Section 20(a) of the Exchange Act (in connection with the Section 10(b) claim); (iii) all defendants under Section 14(a) of the Exchange Act; and (iv) the ATI Individual Defendants and the FVAC Defendants under Section 20(a) of the Exchange Act (in connection with the Section 14(a) claim). Lead Plaintiffs purport to assert these claims on behalf of those ATI stockholders who purchased or otherwise acquired their ATI shares between February 22, 2021 and October 19, 2021, inclusive, and/or held FVAC Class A common shares as of May 24, 2021 and were eligible to vote at FVAC’s June 15, 2021 special meeting. The consolidated amended complaint generally alleges that the proxy materials for the FVAC/ATI merger, as well as other ATI disclosures (including the press release announcing ATI’s financial results for the first quarter of 2021), were false and misleading (and, thus, in violation of Sections 10(b) and 14(a) of the Exchange Act) because they failed to disclose that: (i) ATI was experiencing attrition among its physical therapists; (ii) ATI faced increasing competition for clinicians in the labor market; (iii) as a result, ATI faced difficulty retaining therapists and incurred increased labor costs; (iv) also as a result, ATI would open fewer new clinics; and (v) also as a result, the defendants’ positive statements about ATI’s business, operations, and prospects were materially misleading and/or lacked a reasonable basis. Lead Plaintiffs, on behalf of themselves and the putative class, seek money damages in an unspecified amount and costs and expenses, including attorneys’ and experts’ fees. On April 11, 2022, defendants filed motions to dismiss the consolidated amended complaint, which were fully briefed as of July 25, 2022 and remain pending. The Company has determined that potential liabilities related to the consolidated amended complaint are not considered probable or reasonably estimable at this time.

On February 7, 2023, another purported ATI stockholder, Wendell Robinson, filed a putative class action complaint in the Court of Chancery of the State of Delaware against Fortress Acquisition Sponsor II, LLC, Andrew A. McKnight, Joshua A. Pack, Marc Furstein, Leslee Cowen, Aaron F. Hood, Carmen A. Policy, Rakefet Russak-Aminoach, Sunil Gulati, Daniel N. Bass, Micah B. Kaplan and Labeed Diab. The complaint asserts claims against: (i) Fortress Acquisition Sponsor II, LLC, Andrew A. McKnight, Joshua A. Pack, Marc Furstein, Leslee Cowen, Aaron F. Hood, Carmen A. Policy, Rafeket Russak-Aminoach, Sunil Gulati, Daniel N. Bass and Micah B. Kaplan for breach of fiduciary duty; and (ii) Labeed Diab for aiding and abetting breach of fiduciary duty. Plaintiff's allegations generally mirror those asserted in the federal stockholder class action described above, and Plaintiff further alleges that the alleged misrepresentations and omissions in the proxy materials for the FVAC/ATI merger prevented stockholders from making a fully informed decision on whether to approve the merger or have their shares redeemed. Defendants filed motions to dismiss on April 28, 2023, which remain pending.

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Stockholder derivative complaint

Between December 1, 2021 and September 22, 2022, five purported ATI stockholders filed four derivative actions, purportedly on behalf of ATI, in the U.S. District Court for the Northern District of Illinois. On November 21, 2022, four of these stockholder plaintiffs, Vinay Kumar, Brendan Reginbald, Ziyang Nie and Julia Chang, filed a consolidated amended complaint against Labeed Diab, Joe Jordan, John Larsen, John Maldonado, Carmine Petrone, Christopher Krubert, Joanne Burns and James Parisi (collectively, the “Legacy ATI Defendants”), Drew McKnight, Joshua Pack, Aaron Hood, Carmen Policy, Marc Furstein, Leslee Cowen, Rafeket Russak-Aminoach, and Sunil Gulati (collectively, the “FVACII Individual Defendants”), and Fortress Acquisition Sponsor II, LLC and Fortress Investment Group LLC (together, the "Fortress Entity Defendants," and together with the FVACII Individual Defendants, the “FVACII Defendants”). The consolidated amended complaint asserts claims on behalf of ATI against: (i) the FVACII Defendants for breach of fiduciary duty; (ii) Fortress Acquisition Sponsor II, LLC and the Legacy ATI Defendants for aiding and abetting breach of fiduciary duty; (iii) Labeed Diab, Joe Jordan, and Drew McKnight for contribution under Section 21D of the Exchange Act; (iv) the FVACII Defendants under Section 14(a) of the Exchange Act; (v) the Legacy ATI Defendants for unjust enrichment; and (vi) all defendants for contribution and indemnification under Delaware law. Plaintiffs' allegations generally mirror those asserted in the stockholder class action described above. On January 20, 2023, defendants filed motions to dismiss the consolidated amended complaint, which remain pending. On March 3, 2023, in lieu of filing a response to defendants' motions to dismiss, Plaintiffs filed a motion for leave to file an amended complaint, which was fully briefed as of April 7, 2023 and remains pending. The Company has determined that potential liabilities related to the consolidated amended complaint are not considered probable or reasonably estimable at this time.

Insurance coverage complaint

On March 8, 2023, the Company filed a complaint against Federal Insurance Company, U.S. Specialty Insurance Company and other insurers titled ATI Physical Therapy, Inc. v. Federal Insurance Company et. al., Case No. N23C-03-074, in the Superior Court of the State of Delaware related to a coverage dispute and those certain insurers’ denial of coverage for the stockholder class action complaints and stockholder derivative complaint discussed above. The complaint asserts claims against Federal Insurance Company for breach of contract and bad faith, and claims for declaratory judgment as to Federal Insurance Company, U.S. Specialty Insurance Company, XL Specialty Insurance Company and the Company’s excess insurance carriers, seeking coverage for the stockholder class action complaints and stockholder derivative complaint. Defendants have until May 15, 2023 to respond to the complaint.

Regulatory matters

On November 5, 2021, the Company received from the SEC a voluntary request for the production of documents relating to the earnings forecast and financial information referenced in the Company's July 26, 2021 Form 8-K and related matters. The Company has subsequently received from the SEC additional requests for documents and information related to the same matters, and is cooperating with the SEC's review and investigation of those matters.

Indemnifications

The Company has agreed to indemnify its current and former directors and executive officers for costs associated with any fees, expenses, judgments, fines and settlement amounts incurred by them in any action or proceeding to which any of them are, or are threatened to be, made a party by reason of their service as a director or officer. The Company maintains director and officer insurance coverage that would generally enable it to recover a portion of any amounts paid. The ultimate cost of current or potential future litigation may exceed the Company’s current insurance coverages and may have a material adverse impact on our results of operations, cash flows and financial condition. The Company also may be subject to indemnification obligations by law with respect to the actions of its employees under certain circumstances and in certain jurisdictions.

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Note 17. Loss per Share

Basic loss per share is computed by dividing net loss by the weighted average number of common shares outstanding during the period. For the three months ended March 31, 2023 and 2022, shares of Series A Senior Preferred stock are treated as participating securities and therefore are included in computing earnings per common share using the two-class method. The two-class method is an earnings allocation formula that calculates basic and diluted net earnings per common share for each class of common stock separately based on dividends declared and participation rights in undistributed earnings as if the earnings for the year had been distributed. For the three months ended March 31, 2023 and 2022, the income (loss) available to common stockholders is reduced by the amount of the cumulative dividend for the Series A Senior Preferred Stock that was issued as part of the 2022 Debt Refinancing.

The calculation of both basic and diluted loss per share for the periods indicated below was as follows (in thousands, except per share data):

	Three Months Ended
	March 31, 2023		March 31, 2022
Basic and diluted loss per share:
Net loss	$	(25,210)	$	(138,223)
Less: Net income (loss) attributable to non-controlling interests	1,060		(473)
Less: Series A Senior Preferred cumulative dividend	5,303		1,925
Loss available to common stockholders	$	(31,573)	$	(139,675)
Weighted average shares outstanding(1)	204,921		199,971
Basic and diluted loss per share	$	(0.15)	$	(0.70)

(1) Included within weighted average shares outstanding following the 2022 Debt Refinancing are common shares issuable upon the exercise of the Series II Warrants, as the Series II Warrants are exercisable at any time for nominal consideration. As such, the shares are considered to be outstanding for the purpose of calculating basic and diluted loss per share.

For the periods presented, the following securities were not required to be included in the computation of diluted shares outstanding, as their impact would have been anti-dilutive (in thousands):

	Three Months Ended
	March 31, 2023	March 31, 2022
Series I Warrants	5,226	5,226
IPO Warrants	9,867	9,867
Restricted shares(1)	364	1,248
Stock options	5,003	5,951
RSUs(2)	39,092	4,886
RSAs	144	366
Total	59,696	27,544

(1) Represents certain shares of Class A common stock legally issued, but not outstanding, as of March 31, 2023.

(2) Represents RSUs outstanding under the 2021 Plan if the proposed increase to 2021 Plan share reserve and 2023 grants are approved by stockholders. Refer to Note 9 - Share-Based Compensation for further details.

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As the vesting thresholds have not yet been met as of the end of the reporting period, 15.0 million Earnout Shares and 8.6 million Vesting Shares were excluded from the basic and diluted shares outstanding calculations.

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Item 2.    Management's Discussion and Analysis of Financial Condition and Results of Operations

The following discussion and analysis of ATI Physical Therapy, Inc. and its subsidiaries (herein referred to as “we,” ”us,” “the Company,” “our Company,” "ATI," or "ATIP") should be read in conjunction with the Company’s condensed consolidated financial statements and related notes thereto included elsewhere in this Quarterly Report.

We make statements in this discussion that are forward-looking and involve risks and uncertainties. These statements contain forward-looking information relating to the financial condition, results of operations, plans, objectives, future performance and business of the Company. The forward-looking statements are based on our current views and assumptions, and actual results could differ materially from those anticipated in such forward-looking statements due to factors including, but not limited to, those discussed under “Cautionary Note Regarding Forward-Looking Statements” and Part II, Item 1A. “Risk Factors.”

Many factors are beyond our control. Given these uncertainties, you should not place undue reliance on our forward-looking statements. Our forward-looking statements represent our estimates and assumptions only as of the date of this Quarterly Report. Except as required by law, we are under no obligation to update any forward-looking statement, regardless of the reason the statement may no longer be accurate.

Certain amounts in this Management's Discussion and Analysis may not add due to rounding. All percentages have been calculated using unrounded amounts for the three months ended March 31, 2023 and 2022.

All dollar amounts are presented in thousands, unless indicated otherwise.

Company Overview

We are a nationally recognized outpatient physical therapy provider in the United States specializing in outpatient rehabilitation and adjacent healthcare services, with 909 clinics located in 24 states (as well as 19 clinics under management service agreements) as of March 31, 2023. We operate with a commitment to providing our patients, medical provider partners, payors and employers with evidence-based, patient-centric care.

We offer a variety of services within our clinics, including physical therapy to treat spine, shoulder, knee and neck injuries or pain; work injury rehabilitation services, including work conditioning and work hardening; hand therapy; and other specialized treatment services. Our Company’s team of professionals is dedicated to helping return patients to optimal physical health.

Physical therapy patients receive team-based care, leading-edge techniques and individualized treatment plans in an encouraging environment. To achieve optimal results, we use an extensive array of techniques including therapeutic exercise, manual therapy and strength training, among others. Our physical therapy model aims to deliver optimized outcomes and time to recovery for patients, insights and service satisfaction for referring providers and predictable costs and measurable value for payors.

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In addition to providing services to physical therapy patients at outpatient rehabilitation clinics, we provide services through our ATI Worksite Solutions (“AWS”) program, Management Service Agreements (“MSA”) and Sports Medicine arrangements. AWS provides an on-site team of healthcare professionals at employer worksites to promote work-related injury prevention, facilitate expedient and appropriate return-to-work follow-up and maintain the health and well-being of the workforce. Our MSA arrangements typically include the Company providing management and physical therapy-related services to physician-owned physical therapy clinics. Sports Medicine arrangements provide certified healthcare professionals to various schools, universities and other institutions to perform on-site physical therapy and rehabilitation services.

2022 Debt Refinancing and Preferred Stock Financing

On February 24, 2022, the Company entered into various financing arrangements to refinance its existing long-term debt (the "2022 Debt Refinancing"). The Company entered into a new 2022 Credit Agreement which is comprised of a senior secured term loan which matures on February 24, 2028, and a "super priority" senior secured revolver, which matures on February 24, 2027. Refer to Note 8 - Borrowings in the condensed consolidated financial statements for further details.

In connection with the 2022 Debt Refinancing, the Company issued shares of non-convertible preferred stock and warrants to purchase shares of the Company's common stock (the "Preferred Stock Financing"). Refer to Note 10 - Mezzanine and Stockholders' Equity in the condensed consolidated financial statements for further details.

Trends and Factors Affecting the Company’s Future Performance and Comparability of Results

During the first quarter of 2023, we observed the following trends in our operations:

•Improved patient visit volumes relative to 2022, driven by higher clinician productivity.

•A continued tight labor market for available physical therapy and other healthcare providers in the workforce, contributing to competition in hiring, attrition, clinical staffing level challenges, continued use of contract labor and wage inflation in the physical therapy industry and at ATI.

•Modest decrease in rate per visit relative to the fourth quarter of 2022, driven by rate headwinds including general mix shifts, unfavorable state mix shifts and Medicare rate cuts that became effective on January 1, 2023, partially offset by favorable service mix shifts which are contributing to rate stabilization.

Our ability to achieve our business plan depends upon a number of factors, including, but not limited to, the success of a number of continued steps being taken related to increasing clinical staffing levels, improving and sustaining clinician productivity, controlling costs and capital expenditures, increasing visit volumes and referrals and stabilizing rate per visit.

COVID-19 pandemic and volume impacts 

The coronavirus ("COVID-19") pandemic in the United States resulted in changes to our operating environment. We continue to closely monitor the impact of COVID-19 on all aspects of our business, and our priorities remain protecting the health and safety of employees and patients, maximizing the availability of services to satisfy patient needs, and improving the operational and financial stability of our business.

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As a result of the COVID-19 pandemic, visits per day ("VPD") decreased to a low point of 12,643 during the quarter ended June 30, 2020. The Company has experienced relative increases in quarterly VPD following the low point, as local restrictions in certain markets, referral levels and individual routines evolved compared to prior periods. During the beginning of 2022, we observed volume softness caused, in part, by an increase in COVID-19 cases due to the outbreak of additional variants. Through the remainder of the first half of 2022, we experienced increases in visit volumes relative to the beginning of 2022. Additionally, while we observed volume softness during the third quarter of 2022 due, in part, to seasonality, we experienced increases in quarterly VPD through the fourth quarter of 2022 which has continued into 2023.

The chart below reflects the quarterly trend in VPD.

As demand for physical therapy services has increased in the market since its low point during the quarter ended June 30, 2020, the Company has focused on attempting to increase its clinical staffing levels by hiring clinicians, optimizing clinician hours based on available workforce and attempting to reduce levels of clinician attrition that have been elevated relative to historical levels. The elevated levels of attrition were initially caused, in part, by changes made during the COVID-19 pandemic related to compensation, staffing levels and support for clinicians. We have implemented a range of actions related to compensation, staffing levels, clinical and professional development and other initiatives in an effort to retain and attract therapists across our platform, which has increased our expectations for labor costs. While the Company has observed improvement in hiring and attrition levels since implementing these actions, attrition remains above historical levels due to a continued tight labor market for available physical therapy and other healthcare providers in the workforce which may impede our progress toward increasing visit volumes. In an effort to drive more volume and visits per day, in addition to focusing on clinical staffing levels and clinician productivity, we are working to establish relationships with new referral sources and strengthen relationships with our partner providers and existing referral sources across our geographic footprint.

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The COVID-19 pandemic is still evolving and the full extent of its future impact remains unknown and difficult to predict. The future impact of the COVID-19 pandemic on our performance will depend on certain developments, including the duration and spread of the virus and its newly identified strains, effectiveness and adoption rates of vaccines and other therapeutic remedies, the potential for continued or reinstated restrictive policies enforced by federal, state and local governments, and the impact of the virus and vaccination requirements on our workforce, all of which create uncertainty and cannot be predicted. While we expect the disruption caused by COVID-19 and resulting impacts to diminish over time, we cannot predict the length of such impacts, and if such impacts continue for an extended period, it could have a continued effect on the Company’s results of operations, financial condition and cash flows, which could be material.

CARES Act

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act") was signed into law providing reimbursement, grants, waivers and other funds to assist health care providers during the COVID-19 pandemic. The Company has realized benefits under the CARES Act including, but not limited to, the receipt of Medicare Accelerated and Advance Payment Program ("MAAPP") funds and deferral of depositing the employer portion of Social Security taxes, interest-free and penalty-free. During the year ended December 31, 2022, the remaining obligations related to these benefits were applied and repaid. During the three months ended March 31, 2022, the Company applied $4.3 million in MAAPP funds against the outstanding liability at that time.

Market and industry trends and factors

•Outpatient physical therapy services growth. Outpatient physical therapy continues to play a key role in treating musculoskeletal conditions for patients. According to the Centers for Medicare & Medicaid Services ("CMS"), musculoskeletal conditions impact individuals of all ages and include some of the most common health issues in the U.S. As healthcare trends in the U.S. continue to evolve, with a growing focus on value-based care emphasizing up-front, conservative care to deliver better outcomes, quality healthcare services addressing such conditions in lower cost outpatient settings may continue increasing in prevalence.

•U.S. population demographics. The population of adults aged 65 and older in the U.S. is expected to continue to grow and thus expand the Company’s market opportunity. According to the U.S. Census Bureau, the population of adults over the age of 65 is expected to grow 30% from 2020 through 2030.

•Federal funding for Medicare and Medicaid. Federal and state funding of Medicare and Medicaid and the terms of access to these reimbursement programs affect demand for physical therapy services. In recent years, through legislative and regulatory actions, the federal government has made substantial changes to various payment systems under the Medicare program. In July 2022, the CMS released its proposed 2023 Medicare Physician Fee Schedule which called for an approximate 4.5% reduction in the calendar year 2023 conversion factor. In December 2022, the Consolidated Appropriations Act (2023) was signed into law. The Consolidated Appropriations Act (2023) provides partial relief related to Medicare cuts including 2.5% relief in 2023 and 1.25% relief in 2024. As a result, the reimbursement rate reduction beginning in January 2023 was approximately 2.0%, and the incremental reduction expected to begin in January 2024 is 1.25% if no further modifications to the calendar year 2024 conversion factor are proposed by the CMS.

•Workers’ compensation funding. Payments received under certain workers’ compensation arrangements may be based on predetermined state fee schedules, which may be impacted by changes in state funding.

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•Number of people with private health insurance. Physical therapy services are often covered by private health insurance. Individuals covered by private health insurance may be more likely to use healthcare services because it helps offset the cost of such services. As health insurance coverage rises, demand for physical therapy services tends to also increase.

Key Components of Operating Results

Net patient revenue. Net patient revenues are recorded for physical therapy services that the Company provides to patients including physical therapy, work conditioning, hand therapy, aquatic therapy and functional capacity assessment. Net patient revenue is recognized based on contracted amounts with payors or other established rates, adjusted for the estimated effects of any variable consideration, such as contractual allowances and implicit price concessions. Visit volume is primarily driven by conversion of physician referrals and marketing efforts.

Other revenue. Other revenue consists of revenue generated by our AWS, MSA and Sports Medicine service lines.

Salaries and related costs. Salaries and related costs consist primarily of wages and benefits for our healthcare professionals engaged directly and indirectly in providing services to patients.

Rent, clinic supplies, contract labor and other. Comprised of non-salary, clinic related expenses consisting of rent, clinic supplies, contract labor and other costs including travel expenses and depreciation at our clinics.

Provision for doubtful accounts. Provision for doubtful accounts represents the Company’s estimate of accounts receivable recorded during the period that may ultimately prove uncollectible based upon several factors, including the age of outstanding receivables, the historical experience of collections, the impact of economic conditions and, in some cases, the specific customer account's ability to pay.

Selling, general and administrative expenses. Selling, general and administrative expenses consist primarily of wages and benefits for corporate personnel, corporate outside services, marketing costs, depreciation of corporate fixed assets, amortization of intangible assets and certain corporate level professional fees, including those related to legal, accounting and payroll.

Goodwill, intangible and other asset impairment charges. Goodwill, intangible and other asset impairment charges represent non-cash charges associated with the write-down of goodwill, trade name indefinite-lived intangible and other assets.

Change in fair value of warrant liability. Represents non-cash amounts related to the change in the estimated fair value of the IPO Warrants.

Change in fair value of contingent common shares liability. Represents non-cash amounts related to the change in the estimated fair value of Earnout Shares and Vesting Shares.

Interest expense, net. Interest expense includes the cost of borrowing under the Company’s credit facility and amortization of deferred financing costs.

Other expense, net. Other expense, net is comprised of income statement activity not related to the core operations of the Company.

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Key Business Metrics

When evaluating the results of operations, management has identified a number of metrics that allow for specific evaluation of performance on a more detailed basis. See “Results of Operations” for further discussion on financial statement metrics such as net revenue, net income, EBITDA and Adjusted EBITDA.

Patient visits

As the main operations of the Company are driven by physical therapy services provided to patients, management considers total patient visits to be a key volume measure of such services. In addition to total patient visits, management analyzes (1) average VPD calculated as total patient visits divided by business days for the period, as this allows for comparability between time periods with an unequal number of business days, and (2) average VPD per clinic, calculated as average VPD divided by the average number of clinics open during the period (excluding clinics under management service agreements).

Net patient revenue ("NPR") per visit

The Company calculates net patient revenue per visit, its most significant reimbursement metric, by dividing net patient revenue in a period by total patient visits in the same period.

Clinics

To better understand geographical and location-based trends, the Company evaluates metrics based on the 909 clinics (excluding clinics under management service agreements) and 19 managed clinic locations as of March 31, 2023. De novo clinics represent organic new clinics opened during the current period based on sophisticated site selection analytics. Acqui-novo clinics represent new clinics opened during the current period, that were existing clinic operations not previously owned by the Company, in a target geography that provides the Company with an immediate presence, available staff and referral relationships of the former owner within the surrounding areas. Acquired clinics represent new clinics from purchases of physical therapy practices. Same clinic revenue growth rate identifies revenue growth year over year on clinics that have been owned and operating for over one year. This metric is determined by isolating the population of clinics that have been open for at least 12 months and calculating the percentage change in revenue of this population between the current and prior comparable periods.

The following table presents selected operating and financial data that we believe are key indicators of our operating performance:

	Three Months Ended
	March 31, 2023			March 31, 2022
Number of clinics (end of period)	909			922
Number of clinics managed (end of period)	19			20
New clinics during the period	4			12
Business days	64			64
Average visits per day	22,701			21,062
Average visits per day per clinic	25.0			22.9
Total patient visits	1,452,848			1,347,978
Net patient revenue per visit	$	103.76		$	103.06
Same clinic revenue growth rate	8.7		%	4.3		%

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The following table provides a rollforward of activity related to the number of clinics during the corresponding periods:

	Three Months Ended
	March 31, 2023	March 31, 2022
Number of clinics (beginning of period)	923	910
Add: New clinics opened during the period	4	12
Less: Clinics closed/sold during the period	18	—
Number of clinics (end of period)	909	922

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Results of Operations

Three months ended March 31, 2023 compared to three months ended March 31, 2022

The following table summarizes the Company’s consolidated results of operations for the three months ended March 31, 2023 and 2022:

	Three Months Ended March 31,
	2023				2022				Increase/(Decrease)
($ in thousands, except percentages)	$		% of Revenue		$		% of Revenue		$		%
Net patient revenue	$	150,754	90.3	%	$	138,925	90.3	%	$	11,829	8.5	%
Other revenue	16,178		9.7	%	14,897		9.7	%	1,281		8.6	%
Net revenue	166,932		100.0	%	153,822		100.0	%	13,110		8.5	%
Cost of services:
Salaries and related costs	90,703		54.3	%	87,415		56.8	%	3,288		3.8	%
Rent, clinic supplies, contract labor and other	52,878		31.7	%	51,615		33.6	%	1,263		2.4	%
Provision for doubtful accounts	4,125		2.5	%	5,105		3.3	%	(980)		(19.2)	%
Total cost of services	147,706		88.5	%	144,135		93.7	%	3,571		2.5	%
Selling, general and administrative expenses	30,595		18.3	%	30,024		19.5	%	571		1.9	%
Goodwill, intangible and other asset impairment charges	—		—	%	155,741		101.2	%	(155,741)		n/m
Operating loss	(11,369)		(6.8)	%	(176,078)		(114.5)	%	164,709		n/m
Change in fair value of warrant liability	198		0.1	%	(1,677)		(1.1)	%	1,875		(111.8)	%
Change in fair value of contingent common shares liability	(709)		(0.4)	%	(24,334)		(15.8)	%	23,625		(97.1)	%
Interest expense, net	13,936		8.3	%	8,656		5.6	%	5,280		61.0	%
Other expense, net	354		0.2	%	2,781		1.8	%	(2,427)		(87.3)	%
Loss before taxes	(25,148)		(15.1)	%	(161,504)		(105.0)	%	136,356		(84.4)	%
Income tax expense (benefit)	62		—	%	(23,281)		(15.1)	%	23,343		(100.3)	%
Net loss	$	(25,210)	(15.1)	%	$	(138,223)	(89.9)	%	$	113,013	(81.8)	%

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Net patient revenue. Net patient revenue for the three months ended March 31, 2023 was $150.8 million compared to $138.9 million for the three months ended March 31, 2022, an increase of approximately $11.8 million or 8.5%.

The increase in net patient revenue was primarily driven by increased visit volumes as a result of higher clinician productivity in the current period, as well as favorable net patient revenue per visit in the current period. Furthermore, visit volumes during the three months ended March 31, 2022 were negatively impacted by an increase in COVID-19 cases due to the outbreak of additional variants. Total patient visits increased by approximately 0.1 million visits, or 7.8%, driving an increase in average visits per day of 1,639, or 7.8%. Net patient revenue per visit increased $0.70, or 0.7%, to $103.76 for the three months ended March 31, 2023 compared to $103.06 for the three months ended March 31, 2022. The increase in net patient revenue per visit during the three months ended March 31, 2023 compared to the three months ended March 31, 2022 was primarily driven by favorable service mix shift, partially offset by unfavorable mix shifts related to payor classes and states.

The following chart reflects additional detail with respect to drivers of the change in year-to-date net patient revenue (in millions):

Other revenue. Other revenue for the three months ended March 31, 2023 was $16.2 million compared to $14.9 million for the three months ended March 31, 2022, an increase of $1.3 million or 8.6%. The increase in other revenue was primarily driven by higher AWS and MSA revenues.

Salaries and related costs. Salaries and related costs for the three months ended March 31, 2023 were $90.7 million compared to $87.4 million for the three months ended March 31, 2022, an increase of approximately $3.3 million or 3.8%. Salaries and related costs as a percentage of net revenue was 54.3% and 56.8% for the three months ended March 31, 2023 and 2022, respectively. The increase of $3.3 million was primarily driven by higher compensation due to wage inflation for clinic labor, partially offset by lower cost per visit due to higher clinician productivity. The decrease as a percentage of net revenue was primarily driven by higher clinician productivity and higher net patient revenue per visit during the three months ended March 31, 2023.

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Rent, clinic supplies, contract labor and other. Rent, clinic supplies, contract labor and other costs for the three months ended March 31, 2023 were $52.9 million compared to $51.6 million for the three months ended March 31, 2022, an increase of approximately $1.3 million or 2.4%. Rent, clinic supplies, contract labor and other costs as a percentage of net revenue was 31.7% and 33.6% for the three months ended March 31, 2023 and 2022, respectively. The increase of $1.3 million was primarily driven by higher employee relations costs, partially offset by lower contract labor costs during the three months ended March 31, 2023, and the decrease as a percentage of net revenue was primarily driven by higher net revenue and lower contract labor costs during the three months ended March 31, 2023.

Provision for doubtful accounts. Provision for doubtful accounts for the three months ended March 31, 2023 was $4.1 million compared to $5.1 million for the three months ended March 31, 2022, a decrease of $1.0 million or 19.2%. Provision for doubtful accounts as a percentage of net revenue was 2.5% and 3.3% for the three months ended March 31, 2023 and 2022, respectively. The decrease of $1.0 million and decrease as a percentage of net revenue was primarily driven by favorable cash collections during the three months ended March 31, 2023.

Selling, general and administrative expenses. Selling, general and administrative expenses for the three months ended March 31, 2023 were $30.6 million compared to $30.0 million for the three months ended March 31, 2022, an increase of $0.6 million or 1.9%. Selling, general and administrative expenses as a percentage of net revenue was 18.3% and 19.5% for the three months ended March 31, 2023 and 2022, respectively. The increase of $0.6 million was primarily due to higher transaction costs, partially offset by lower non-ordinary legal and regulatory costs and other professional fees during the three months ended March 31, 2023. The decrease as a percentage of net revenue was primarily driven by higher net revenue, lower non-ordinary legal and regulatory costs and other professional fees during the three months ended March 31, 2023.

Goodwill, intangible and other asset impairment charges. Goodwill, intangible and other asset impairment charges for the three months ended March 31, 2022 was $155.7 million. The amount primarily relates to the non-cash write-down of goodwill and the trade name indefinite-lived intangible asset as a result of factors including increases in discount rates and lower public company comparative multiples during the three months ended March 31, 2022. There were no goodwill, intangible and other asset impairment charges during the three months ended March 31, 2023.

Change in fair value of warrant liability. Change in fair value of warrant liability for the three months ended March 31, 2023 was a loss of $0.2 million compared to a gain of $1.7 million for the three months ended March 31, 2022. The loss relates to the increase in the estimated fair value of the Company's IPO Warrants, primarily driven by increases in price of the Company's Public Warrants during the three months ended March 31, 2023, and the gain relates to the decrease in the estimated fair value of the Company’s IPO Warrants, primarily driven by decreases in price of the Company's Public Warrants during the three months ended March 31, 2022.

Change in fair value of contingent common shares liability. Change in fair value of contingent common shares liability for the three months ended March 31, 2023 was a gain of $0.7 million compared to a gain of $24.3 million for the three months ended March 31, 2022. The gain in each period relates to the decrease in the estimated fair value of the Company’s Earnout Shares and Vesting Shares, primarily driven by decreases in the Company's share price during the three months ended March 31, 2023 and 2022, respectively.

Interest expense, net. Interest expense, net for the three months ended March 31, 2023 was $13.9 million compared to $8.7 million for the three months ended March 31, 2022, an increase of approximately $5.3 million or 61.0%. The increase in interest expense was primarily driven by higher interest rates under the Company's credit agreement, partially offset by higher cash flow hedge benefits recognized during the three months ended March 31, 2023.

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Other expense, net. Other expense, net for the three months ended March 31, 2023 was $0.4 million compared to $2.8 million for the three months ended March 31, 2022, a decrease of approximately $2.4 million. The decrease was driven by $2.8 million in loss on debt extinguishment related to the derecognition of the unamortized deferred financing costs and original issuance discount associated with the full repayment of the 2016 first lien term loan during the three months ended March 31, 2022 that did not recur in 2023.

Income tax expense (benefit). Income tax expense for the three months ended March 31, 2023 was approximately $0.1 million compared to income tax benefit of $23.3 million for the three months ended March 31, 2022, a decrease in benefit of approximately $23.3 million. The decrease was primarily driven by the difference in the effective tax rate for the respective periods. The effective tax rate was different between the respective periods primarily due to the recognition of valuation allowances against federal and state net operating losses and other tax attributes, such as interest disallowances, for which future realization is uncertain during the three months ended March 31, 2023.

Net loss. Net loss for the three months ended March 31, 2023 was $25.2 million compared to $138.2 million for the three months ended March 31, 2022, a decrease in loss of approximately $113.0 million. The comparatively lower loss was primarily driven by the absence of goodwill, intangible and other asset impairment charges, partially offset by lower net gains related to changes in fair value of warrant liability and contingent common shares liability during the three months ended March 31, 2023 as compared to the three months ended March 31, 2022.

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Non-GAAP Financial Measures

The following table reconciles the supplemental non-GAAP financial measures, as defined under the rules of the U.S. Securities and Exchange Commission ("SEC"), presented herein to the most directly comparable financial measures calculated and presented in accordance with U.S. generally accepted accounting principles ("GAAP"). The Company has provided the non-GAAP financial measures, which are not calculated or presented in accordance with GAAP, as supplemental information and in addition to the financial measures that are calculated and presented in accordance with GAAP. EBITDA and Adjusted EBITDA are defined as net income from continuing operations calculated in accordance with GAAP, less net income attributable to non-controlling interests, plus the sum of income tax expense, interest expense, net, depreciation and amortization (“EBITDA”) and further adjusted to exclude certain items of a significant or unusual nature, including but not limited to, goodwill, intangible and other asset impairment charges, changes in fair value of warrant liability and contingent common shares liability, transaction and integration costs, non-ordinary legal and regulatory matters, share-based compensation, business optimization costs, pre-opening de novo costs, reorganization and severance costs, loss on debt extinguishment, and gain on sale of Home Health service line (“Adjusted EBITDA”).

We present EBITDA and Adjusted EBITDA because they are key measures used by our management team to evaluate our operating performance, generate future operating plans and make strategic decisions. The Company believes EBITDA and Adjusted EBITDA are useful to investors for the purposes of comparing our results period-to-period and alongside peers and understanding and evaluating our operating results in the same manner as our management team and board of directors.

These supplemental measures should not be considered superior to, as a substitute for or as an alternative to, and should be considered in conjunction with, the GAAP financial measures presented. In addition, since these non-GAAP measures are not determined in accordance with GAAP, they are susceptible to varying calculations and may not be comparable to other similarly titled non-GAAP measures of other companies.

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EBITDA and Adjusted EBITDA (Non-GAAP Financial Measures)

The following is a reconciliation of net loss, the most directly comparable GAAP financial measure, to EBITDA and Adjusted EBITDA (each of which is a non-GAAP financial measure) for each of the periods indicated. For additional information on these non-GAAP financial measures, see “Non-GAAP Financial Measures” above.

	Three Months Ended
($ in thousands)	March 31, 2023		March 31, 2022
Net loss	$	(25,210)	$	(138,223)
Plus (minus):
Net (income) loss attributable to non-controlling interests	(1,060)		473
Interest expense, net	13,936		8,656
Income tax expense (benefit)	62		(23,281)
Depreciation and amortization expense	9,564		9,900
EBITDA	$	(2,708)	$	(142,475)
Goodwill, intangible and other asset impairment charges(1)	—		155,741
Goodwill, intangible and other asset impairment charges attributable to non-controlling interests(1)	—		(940)
Changes in fair value of warrant liability and contingent common shares liability(2)	(511)		(26,011)
Transaction and integration costs(3)	5,408		1,538
Non-ordinary legal and regulatory matters(4)	1,523		2,497
Share-based compensation	1,478		1,964
Business optimization costs(5)	(702)		—
Pre-opening de novo costs(6)	172		381
Reorganization and severance costs(7)	130		—
Loss on debt extinguishment(8)	—		2,809
Gain on sale of Home Health service line, net	—		(199)
Adjusted EBITDA	$	4,790	$	(4,695)

(1)Represents non-cash charges related to the write-down of goodwill, trade name indefinite-lived intangible and other assets.

(2)Represents non-cash amounts related to the change in the estimated fair value of IPO Warrants, Earnout Shares and Vesting Shares. Refer to Notes 11 and 12 of the accompanying condensed consolidated financial statements for further details.

(3)Represents non-capitalizable debt and capital transaction costs.

(4)Represents non-ordinary course legal costs related to the previously disclosed ATIP stockholder class action complaints, derivative complaint and SEC matter. Refer to Note 16 of the accompanying condensed consolidated financial statements for further details.

(5)Represents realized benefit of labor related CARES Act credit that was not previously considered probable and relates to prior years.

(6)Represents expenses associated with renovation, equipment and marketing costs relating to the start-up and launch of new locations incurred prior to opening.

(7)Represents severance costs related to discrete initiatives focused on reorganization and delayering of the Company’s labor model, management structure and support functions.

(8)Represents charges related to the derecognition of the unamortized deferred financing costs and original issuance discount associated with the full repayment of the 2016 first lien term loan. Refer to Note 8 of the accompanying condensed consolidated financial statements for further details.

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Liquidity and Capital Resources

Our principal sources of liquidity are borrowings under our credit agreement and proceeds from equity issuances. We have used these funds for our short-term and long-term capital needs, which include salaries, benefits and other employee-related expenses, rent, clinical supplies, outside services, capital expenditures, acquisitions, de novos, acqui-novos and debt service. Our capital expenditure, acquisition, de novo and acqui-novo spend will depend on many factors, including, but not limited to, the targeted number of new clinic openings, patient volumes, clinician labor market, revenue growth rates and level of operating cash flows.

As of March 31, 2023 and December 31, 2022, we had $63.1 million and $83.1 million in cash and cash equivalents, respectively. As of March 31, 2023, we had no available capacity under our revolving credit facility.

For the three months ended March 31, 2023, we had operating cash outflows of $14.2 million driven by items including net losses and payments related to operating lease liabilities, accounts payable, accrued expenses and other liabilities. Our ability to generate future operating cash flows depends on many factors, including clinical staffing levels and productivity, costs and capital expenditures, patient volumes, referrals and revenue growth rates.

We make reasonable and appropriate efforts to collect accounts receivable, including payor amounts and applicable patient deductibles, co-payments and co-insurance, in a consistent manner for all payor types. Claims are submitted to payors daily, weekly or monthly in accordance with our policy or payor’s requirements. When possible, we submit our claims electronically. The collection process is time consuming and typically involves the submission of claims to multiple payors whose payment of claims may be dependent upon the payment of another payor. Claims under litigation and vehicular incidents can take a year or longer to collect.

Liquidity and going concern

The accompanying unaudited condensed consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business within twelve months after the date that these condensed consolidated financial statements are issued.

As of March 31, 2023, the Company had $63.1 million in cash and cash equivalents and no available capacity under its revolving credit facility. The Company was in compliance with its minimum liquidity covenant under the 2022 Credit Agreement as of March 31, 2023.

The Company has negative operating cash flows, operating losses and net losses. For the three months ended March 31, 2023, the Company had cash flows used in operating activities of $14.2 million, operating loss of $11.4 million and net loss of $25.2 million. These results are, in part, due to recent trends experienced by the Company including a tight labor market for available physical therapy and other healthcare providers in the workforce, visit volume softness, decreases in rate per visit and increases in interest costs.

Further, based on current liquidity and projected cash use, the Company anticipates violation of its minimum liquidity covenant under its 2022 Credit Agreement (as defined in Note 8) within the next twelve months following the issuance date of the condensed consolidated financial statements as of and for the period ended March 31, 2023 (refer to Note 8 - Borrowings for further discussion of the 2022 Credit Agreement and related covenants).

These conditions and events raise substantial doubt about the Company's ability to continue as a going concern.

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In addition, the report of the Independent Registered Public Accounting Firm accompanying the consolidated financial statements for the year ended December 31, 2022 contains an explanatory paragraph expressing substantial doubt about our ability to continue as a going concern. Absent an amendment or waiver, the 2022 Credit Agreement provides that the receipt of a report of the Independent Registered Public Accounting Firm containing an explanatory paragraph expressing substantial doubt about our ability to continue as a going concern could be an event of default, subject to certain exceptions. Pursuant to the Transaction Support Agreement, dated as of March 15, 2023, the First Lien Lenders have agreed that, prior to June 15, 2023 (the “Outside Closing Date”), they will forbear in the exercise of any rights, remedies, powers, privileges and defenses under the 2022 Credit Agreement arising on account of a default, alleged default or event of default (if any) resulting from the going concern explanatory paragraph in the report of the Independent Registered Public Accounting Firm accompanying the consolidated financial statements for the year ended December 31, 2022. However, if the Transaction (as defined and for which the terms are further described in Note 8) is not consummated on its terms or at all, the First Lien Lenders could claim that a default or event of default has occurred under the 2022 Credit Agreement. If such claim is not waived by the First Lien Lenders and the Company is unsuccessful in disputing any such claims (including with respect to the applicability of one of the enumerated exceptions to the 2022 Credit Agreement requirement), the Company could be considered to have an event of default after the expiration of the applicable cure periods.

In the event of a default, all amounts outstanding under the 2022 Credit Facility, together with any accrued interest, could then be declared immediately due and payable and could be reclassified to current in the Company's condensed consolidated financial statements for the period. A default on our obligations and an acceleration of our indebtedness by our lenders would have a material adverse impact on our business, financial condition, results of operations and cash flows, and may lead to events including bankruptcy, reorganization or insolvency.

In response to these conditions, management plans include improving operating results and cash flows and refinancing the Company's debt under its 2022 Credit Agreement.

The Company's plan to improve operating results and cash flow is dependent upon its ability to achieve its business plan to increase clinical staffing levels, improve clinician productivity, control costs and capital expenditures, increase patient visit volumes and referrals and stabilize rate per visit. There can be no assurance that it will be successful in any of these respects.

In order to refinance the Company’s debt under its 2022 Credit Agreement, the Company has agreed, subject to stockholder approval of the Transaction (as defined and for which the terms are further described in Note 8), to (i) a delayed draw new money financing in an aggregate principal amount of $25.0 million, comprised of (A) second lien PIK convertible notes (the “Notes”) and (B) shares of Series B Preferred Stock (as defined in Note 8), which will provide the holder thereof with voting rights such that the holders thereof will have the right to vote on an as-converted basis, (ii) facilitate the exchange of $100.0 million of the aggregate principal amount of the term loans under the 2022 Credit Agreement held by certain of the Preferred Equityholders for Notes and Series B preferred Stock and (iii) agree to certain other changes to the terms of the 2022 Credit Agreement, including modifications of the financial covenants thereunder. Holders of the Notes will also receive additional Notes upon the in-kind payment of interest on any outstanding Notes. The Notes will be convertible into shares of Class A common stock at a fixed conversion price.

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If the Company does not consummate the Transaction on a timely basis as further described in Note 8 or otherwise access additional financing, the Company will need to consider other alternatives, including pursuing separate amendments to or waivers of the minimum liquidity covenant, the requirement to deliver audited financial statements without certain going concern qualifications, and other requirements under the 2022 Credit Agreement, as well as raising funds from other sources, obtaining alternate financing, disposal of assets, or pursuing other strategic alternatives to improve its liquidity position and business results. There can be no assurance that the Company will be successful in completing the Transaction or accessing such alternative options or financing when needed. Failure to do so could have a material adverse impact on our business, financial condition, results of operations and cash flows, and may lead to events including bankruptcy, reorganization or insolvency.

Management plans have not been fully implemented and, as a result, the Company has concluded that management’s plans do not alleviate substantial doubt about the Company’s ability to continue as a going concern.

The condensed consolidated financial statements do not include any adjustments relating to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that might result from the outcome of this uncertainty.

Amended and Restated Transaction Support Agreement

On April 17, 2023, the Company entered into (i) an Amended and Restated Transaction Support Agreement (the "A&R TSA") to that certain Transaction Support Agreement, dated as of March 15, 2023, by and among the Company and certain of the Company’s affiliates, certain of its first lien lenders under the 2022 Credit Agreement (the “First Lien Lenders”), the administrative agent under the 2022 Credit Agreement, holders of its Series A Senior Preferred Stock (the “Preferred Equityholders”) and holders of the majority of its common stock (collectively, the “Parties”), (ii) Amendment No. 2 (the “Credit Agreement Amendment”) to the Company’s Credit Agreement, dated as of February 24, 2022, by and among ATI Holdings Acquisition, Inc. (the "Borrower"), Wilco Intermediate Holdings, Inc. (“Holdings”), as loan guarantor, Barclays Bank PLC, as administrative agent and issuing bank, and the lenders party thereto (the “2022 Credit Agreement” and together with the Credit Agreement Amendment, the “Credit Agreement”), (iii) a Second Lien Note Purchase Agreement (the “Note Purchase Agreement”), by and among the Company, Wilco Holdco, Inc. (“Wilco”), Holdings, the Borrower, the purchasers from time to time party thereto (the “Purchasers”) and Wilmington Savings Fund Society, FSB, as purchaser representative and (iv) certain other definitive agreements relating to the comprehensive transaction to enhance the Company’s liquidity (the “Transaction,” and such documents referred to collectively as the “Signing Date Definitive Documents”).

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Transaction Support Agreement

The A&R TSA sets forth the principal terms of a comprehensive transaction to enhance the Company’s liquidity. Pursuant to the A&R TSA, the Company and the Parties agreed to and appended thereto substantially final forms of the remaining definitive documents (together with the Signing Date Definitive Documents, the “Definitive Documents”) and subject to the terms and conditions thereof, the Parties have agreed to support, act in good faith and take all steps reasonably necessary and desirable to consummate the transactions referenced therein by the Outside Closing Date. Specifically, the Company has agreed, subject to stockholder approval of the Transaction, to a delayed draw new money financing in which the Company (i) may cause to be issued to the Purchasers an aggregate principal amount of $25.0 million (the “Delayed Draw Amounts”) in the form of a new stapled security, comprised of (A) second lien PIK convertible notes (the “Notes”) and (B) shares of Series B Preferred Stock (the "Series B Preferred Stock"), which will provide the holder thereof with voting rights such that the holders thereof will have the right to vote on an as-converted basis as if the conversion occurred at an initial price per share equal to the average closing price for the five trading days immediately preceding the date on which the Note Purchase Agreement was signed (the “NYSE Minimum Price”), (ii) will facilitate the exchange of $100.0 million of the aggregate principal amount of the term loans under the 2022 Credit Agreement held by certain of the Preferred Equityholders for Notes and Series B Preferred Stock and (iii) will agree to certain other changes to the terms of the 2022 Credit Agreement, including modifications of the financial covenants thereunder. Holders of the Notes will also receive additional Notes upon the in-kind payment of interest on any outstanding Notes. The Notes will be convertible into shares of Class A common stock, par value $0.0001 per share, of the Company (“Common Stock”) at a fixed conversion price of $0.25 (subject to adjustment as provided in the Note Purchase Agreement, the “Conversion Price”).

In addition, as part of the Transaction, (1) the Preferred Equityholders’ preexisting rights as holders of the Company’s Series A Senior Preferred Stock to designate and elect one director to the Company’s board of directors (the “Board”) will be revised to provide that (a) the Preferred Equityholders have the right to appoint three additional directors to the Board (resulting in the right of the Preferred Equityholders to appoint a total of four directors to the Board) until such time after the closing date of the Transaction (the "Closing Date") that the Lead Purchaser (in each case, as defined in certain of the transaction agreements entered into in connection with the original issuance of the Series A Preferred Stock) ceases to hold at least 50.1% of the Series A Preferred Stock held by it as of the Closing Date, one of whom must be unaffiliated with (and independent of) the Preferred Equityholders and who must meet the definition of “independent” under the listing standards of the New York Stock Exchange, and by the SEC; and (b) all such designee directors of the Preferred Equityholders will be subject to consideration by the Board (acting in good faith and consistent with their review of other Board candidates) and (2) the provision in the certificate of designation of the Company’s Series A Senior Preferred Stock that eliminated the Preferred Equityholders’ director designation rights upon the Company’s achievement of certain amounts of EBITDA will be deleted (and the equivalent provision in that certain Investors’ Rights Agreement, dated as of February 24, 2022, by and among the Company and the Preferred Equityholders listed therein, will also be deleted).

In addition, the A&R TSA contains certain representations, warranties and other agreements by the Company and the Parties. The Company’s and the Parties’ obligations under the A&R TSA are, and the closing of the Transaction is, subject to various customary terms and conditions set forth therein, including the execution and delivery of definitive documentation and approval by the Company’s stockholders.

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Credit Agreement Amendment

The Credit Agreement Amendment provides, among other things, (i) a reduction of the thresholds applicable to the minimum liquidity financial covenant under the 2022 Credit Agreement for certain periods, (ii) a waiver of the requirement to comply with the Secured Net Leverage Ratio financial covenant under the 2022 Credit Agreement for the fiscal quarters ending June 30, 2024, September 30, 2024 and December 31, 2024 and a modification of the levels and certain component definitions applicable thereto in the fiscal quarters ending after December 31, 2024, (iii) an extension of the minimum liquidity financial covenant for the fiscal quarters in which the Secured Net Leverage Ratio financial covenant was waived, (iv) a waiver of the requirement for the Company to deliver audited financial statements without certain going concern qualifications for the years ended December 31, 2022, December 31, 2023, and December 31, 2024, (v) an increase in the interest rate payable on the existing term loans and revolving loans until the achievement of a specified financial metric and (vi) board representation and observer rights and other changes to the governance of the Company.

Note Purchase Agreement and Series B Preferred Stock

The Note Purchase Agreement contains customary representations, warranties, conditions and indemnification obligations by each party thereto. The representation, warranties and covenants contained therein were made only for the purposes of the Note Purchase Agreement, and as of specific dates, were solely for the benefit of the parties to such agreement and are subject to certain limitations set forth therein.

Draws. Draws on the Delayed Draw Amounts will be available beginning immediately on the Closing Date and ending on the date that is 18 months after the Closing Date, the Company may request either (i) two draws in an amount of $12.5 million each, or (ii) one draw in an amount of $25.0 million, subject in each case to, (a) projected liquidity at any time during the 6-month period following the date of the relevant draw being below either (i) $20 million or (ii) the prevailing minimum liquidity covenant threshold, as determined by reference to the Credit Agreement and (b) the consent of at least a majority of the disinterested directors on our Board. The Note Purchase Agreement also provides, subject to certain conditions (including the receipt of commitments therefor) and consent rights outlined in the Note Purchase Agreement for the ability of the Company to issue up to an additional $150.0 million in Notes. Proceeds of the Notes may be used for general corporate purposes, subject to certain exceptions.

Interest. The Notes will bear interest at a rate of 8.00% per annum, payable quarterly in-kind in the form of additional Notes by capitalizing the amount of such interest on the outstanding principal balance of the Notes in arrears on each interest payment date.

Maturity. The Notes will mature on August 24, 2028, unless earlier repurchased or converted.

Conversion. The Notes may be converted, in whole or in part (if the portion to be converted is $1,000 principal amount or an integral multiple thereof), at the option of the holder, into shares of Common Stock based on the Conversion Price.

Forced Conversion. On or after the second anniversary of the Closing Date, the Company may, at its option, from time to time, elect to convert a portion of the outstanding Notes into the number of shares of Common Stock issuable upon conversion based on the Conversion Price then in effect, subject in each case to the satisfaction of the conditions contained in the Note Purchase Agreement.

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Adjustments to Conversion Price. The Conversion Price is subject to adjustment as a result of certain events including, but not limited to, certain issuances of Common Stock as a dividend or distribution, issuances of rights, options or warrants to purchase Common Stock at a price per share less than the average closing price per share of Common Stock for the ten trading days preceding the date of announcement of such issuance, effecting a share split or combination of the shares of Common Stock, issuance of a cash dividend or distribution and other issuances for a consideration per share less than the Conversion Price.

Guarantees; Collateral; Ranking. The Notes will be guaranteed by Wilco, Holdings, the Borrower, and the subsidiaries of ATI Holdings Acquisition, Inc. that guaranty the obligations under the Credit Agreement. The Notes will be secured by the same collateral that secures the obligations under the Credit Agreement.

Pursuant to the terms of an intercreditor and subordination agreement, the Notes (and the guarantees thereof) will rank junior in right of payment to the obligations under the Credit Agreement, and the liens on the collateral securing the Notes will rank junior to the liens on such collateral securing the obligations under the Credit Agreement.

Other Covenants. The Note Purchase Agreement includes affirmative and negative covenants (other than financial covenants) that are substantially consistent with the Credit Agreement, as well as customary events of default.

Voting. The Company will issue to each holder of Notes shares of Series B Preferred Stock in an amount equal to the quotient (rounded down to the nearest whole number) obtained by dividing (A) the amount paid by such holder to the Company for the Notes by (B) $1,000, resulting in more votes per share of Series B Preferred Stock than one share of Common Stock. Notwithstanding that one share of Series B Preferred Stock shall represent more votes than one share of Common Stock, the holders of shares of Series B Preferred Stock shall have full voting rights and powers equal to the voting rights and powers of the holders of Common Stock, and shall be entitled to notice of any stockholders' meeting in accordance with the bylaws of the Company, shall be entitled to vote, together with holders of Common Stock, with respect to any question upon which holders of Common Stock have the right to vote. Fractional votes shall not, however, be permitted, and any fractional voting rights available on an as-converted basis (after aggregating all shares into which shares of Series B Preferred Stock held by each holder could be converted) shall be rounded down to the nearest whole share of Series B Preferred Stock.

The Series B Preferred Stock shall not have any dividend or redemption rights and, in the event of any voluntary or involuntary liquidation, dissolution or winding up of the Company, the holders of Series B Preferred Stock shall be entitled to be paid out of the assets of the Company available for distribution to its stockholders, after satisfying any senior payment obligations and before any payment in respect of any Common Stock, an amount per share of Series B Preferred Stock equal to $0.0001.

The Series B Preferred Stock shall be governed in all respects by Delaware law.

The Transaction is subject to the execution of the Definitive Documents, as well as customary closing conditions. In addition, the closing of the Transaction and the matters contemplated by each of the A&R TSA, Credit Agreement Amendment and Note Purchase Agreement, are subject in each case to approval by the Company’s stockholders.

There is no assurance that the Transaction will be consummated on the terms as described above, on a timely basis or at all.

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2022 Credit Agreement

On February 24, 2022 (the "Refinancing Date"), the Company entered into various financing arrangements to refinance its previous long-term debt, which consisted of $555.0 million in principal under the Company's previous term loan (the "2016 first lien term loan"), which was repaid in full on the Refinancing Date. As part of the 2022 Debt Refinancing, ATI Holdings Acquisition, Inc., an indirect subsidiary of ATI Physical Therapy, Inc., entered into a credit agreement among the Borrower, Wilco Intermediate Holdings, Inc., as loan guarantor, Barclays Bank PLC, as administrative agent and issuing bank, and a syndicate of lenders. The 2022 Credit Agreement provides a $550.0 million credit facility (the "2022 Credit Facility") that is comprised of a $500.0 million senior secured term loan (the "Senior Secured Term Loan") which was fully funded at closing and a $50.0 million "super priority" senior secured revolver (the "Revolving Loans") with a $10.0 million letter of credit sublimit. The 2022 Credit Facility refinanced and replaced the Company's prior credit facility for which Barclays Bank PLC served as administrative agent for a syndicate of lenders.

The Company recognized $2.8 million in loss on debt extinguishment related to the derecognition of the remaining unamortized deferred financing costs and unamortized original issue discount in conjunction with the repayment of the 2016 first lien term loan. The Company capitalized debt issuance costs totaling $12.5 million related to the 2022 Credit Facility as well as an original issue discount of $10.0 million. The Company capitalized issuance costs of $0.5 million related to the Revolving Loans.

The Senior Secured Term Loan matures on February 24, 2028 and bears interest, at the Company's election, at a base interest rate of the Alternate Base Rate ("ABR"), as defined in the agreement, plus an applicable credit spread, or the Adjusted Term Secured Overnight Financing Rate ("SOFR"), as defined in the agreement, plus an applicable credit spread. The credit spread is determined based on a pricing grid and the Company's Secured Net Leverage Ratio. The Company may elect to pay 2.0% interest in-kind at a 0.5% premium during the first year under the agreement. The Company elected to pay a portion of its interest in-kind beginning in the third quarter of 2022. As of March 31, 2023, borrowings on the Senior Secured Term Loan bear interest at 3-month SOFR, subject to a 1.0% floor, plus 7.25% plus the 0.5% paid-in-kind interest premium. As of March 31, 2023, the interest rate on the Senior Secured Term Loan was 12.6% and the effective interest rate was 13.7%. As of March 31, 2023, the outstanding principal amount under the Senior Secured Term Loan was $505.2 million.

The Revolving Loans are subject to a maximum borrowing capacity of $50.0 million and mature on February 24, 2027. Borrowings on the Revolving Loans bear interest, at the Company's election, at a base interest rate of the ABR, as defined in the agreement, plus an applicable credit spread, or the Adjusted Term SOFR Rate, as defined in the agreement, plus an applicable credit spread. The credit spread is determined based on a pricing grid and the Company's Secured Net Leverage Ratio. Commitment fees on the Revolving Loans are payable quarterly at 0.5% per annum on the daily average undrawn portion for the quarter and are expensed as incurred. In December 2022, the Company drew $48.2 million in Revolving Loans. As of March 31, 2023, $48.2 million in Revolving Loans were outstanding and bearing interest at a rate of 8.8%.

The 2022 Credit Facility is guaranteed by certain of the Company’s subsidiaries and is secured by substantially all of the assets of Holdings, the Borrower and the Borrower’s wholly owned subsidiaries, including a pledge of the stock of the Borrower, in each case, subject to customary exceptions.

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The 2022 Credit Agreement contains customary covenants and restrictions, including financial and non-financial covenants. The financial covenants require the Company to maintain $30.0 million of minimum liquidity, as defined in the agreement, at each test date through the first quarter of 2024. Additionally, beginning in the second quarter of 2024, the Company must maintain a Secured Net Leverage Ratio, as defined in the agreement, not to exceed 7.00:1.00. The net leverage ratio covenant decreases in the third quarter of 2024 to 6.75:1.00 and further decreases in the first quarter of 2025 to 6.25:1.00, which remains applicable through maturity. The financial covenants are tested as of each fiscal quarter end for the respective periods. As of March 31, 2023, the Company is in compliance with its minimum liquidity financial covenant.

The 2022 Credit Facility contains customary representations and warranties, events of default, reporting and other affirmative covenants and negative covenants, including requirements related to the delivery of independent audit reports without certain going concern qualifications, limitations on indebtedness, liens, investments, negative pledges, dividends, junior debt payments, fundamental changes and asset sales and affiliate transactions. Failure to comply with the 2022 Credit Facility covenants and restrictions could result in an event of default under the 2022 Credit Facility, subject to customary cure periods. In such an event, all amounts outstanding under the 2022 Credit Facility, together with any accrued interest, could then be declared immediately due and payable.

Under the 2022 Credit Facility, the Company may be required to make certain mandatory prepayments upon the occurrence of certain events, including: an event of default, a prepayment asset sale or receipt of net insurance proceeds (as defined in the 2022 Credit Agreement) in excess of $15.0 million, or excess cash flows exceeding certain thresholds (as defined in the 2022 Credit Agreement).

Preferred Stock Financing

In connection with the 2022 Debt Refinancing, the Company issued 165,000 shares of non-convertible preferred stock (the "Series A Senior Preferred Stock") plus 5.2 million warrants to purchase shares of the Company's common stock at an exercise price of $3.00 per share (the "Series I Warrants") and warrants to purchase 6.3 million shares of the Company's common stock at an exercise price equal to $0.01 per share (the "Series II Warrants"). The shares of the Series A Senior Preferred Stock have a par value of $0.0001 per share and an initial stated value of $1,000 per share, for an aggregate initial stated value of $165.0 million. The Series I and Series II Warrants are exercisable for 5 years from the Refinancing Date.

The gross proceeds received from the issuance of the Series A Senior Preferred Stock and the Series I and Series II Warrants were $165.0 million, which was allocated among the instruments based on the relative fair values of each instrument. Of the gross proceeds, $144.7 million was allocated to the Series A Senior Preferred Stock, $5.1 million to the Series I Warrants and $15.2 million to the Series II Warrants. The resulting discount on the Series A Senior Preferred Stock will be recognized as a deemed dividend when those shares are subsequently remeasured upon becoming redeemable or probable of becoming redeemable. The Company recognized $2.9 million in issuance costs and $1.4 million of original issue discount related to the Series A Senior Preferred Stock. The Company recognized total issuance costs and original issue discount of approximately $0.2 million and $0.5 million related to the Series I Warrants and Series II Warrants, respectively.

The Series A Senior Preferred Stock has priority over the Company's Class A common stock and all other junior equity securities of the Company, and is junior to the Company's existing or future indebtedness and other liabilities (including trade payables), with respect to payment of dividends, distribution of assets, and all other liquidation, winding up, dissolution, dividend and redemption rights.

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The Series A Senior Preferred Stock carries an initial dividend rate of 12.0% per annum (the "Base Dividend Rate"), payable quarterly in arrears. Dividends will be paid in-kind and added to the stated value of the Series A Senior Preferred Stock. The Company may elect to pay dividends on the Series A Senior Preferred Stock in cash beginning on the third anniversary of the Refinancing Date and, with respect to any such dividends paid in cash, the dividend rate then in effect will be decreased by 1.0%.

The Base Dividend Rate is subject to certain adjustments, including an increase of 1.0% per annum on the first day following the fifth anniversary of the Refinancing Date and on each one-year anniversary thereafter, and 2.0% per annum upon the occurrence of either an Event of Noncompliance (as defined in the Certificate of Designation) or a failure by the Company to redeem in full all Series A Senior Preferred Stock upon a Mandatory Redemption Event, which includes a change of control, liquidation, bankruptcy or certain restructurings. The paid in-kind dividends related to the Series A Preferred Stock were $5.3 million and $1.9 million for the three months ended March 31, 2023 and 2022, respectively. As of March 31, 2023, the accumulated paid in-kind dividends related to the Series A Preferred Stock were $23.2 million and the aggregate stated value was $188.2 million.

The Company has the right to redeem the Series A Senior Preferred Stock, in whole or in part, at any time (subject to certain limitations on partial redemptions). The Redemption Price for each share of Series A Senior Preferred Stock is equal to the stated value subject to certain price adjustments depending on when such optional redemption takes place, if at all.

The Series A Senior Preferred Stock is perpetual and is not mandatorily redeemable at the option of the holders, except upon the occurrence of a Mandatory Redemption Event. Upon the occurrence of a Mandatory Redemption Event, to the extent not prohibited by law, the Company is required to redeem all Series A Senior Preferred Stock, in cash, at a price per share equal to the then applicable Redemption Price. Based on the Company’s assessment of the conditions which would trigger the redemption of the Series A Senior Preferred Stock, the Company has determined that the Series A Senior Preferred Stock is neither currently redeemable nor probable of becoming redeemable. Because the Series A Senior Preferred Stock is classified as mezzanine equity and is not considered redeemable or probable of becoming redeemable, the paid in-kind dividends that are added to the stated value do not impact the carrying value of the Series A Senior Preferred Stock in the Company’s condensed consolidated balance sheets. Should the Series A Senior Preferred Stock become probable of becoming redeemable, the Company will recognize changes in the redemption value of the Series A Senior Preferred Stock immediately as they occur and adjust the carrying amount accordingly at the end of each reporting period. As of March 31, 2023, the redemption value of the Series A Senior Preferred Stock was $188.2 million, which is the stated value.

If an Event of Noncompliance occurs, then the holders of a majority of the then outstanding shares of Series A Senior Preferred Stock (the “Majority Holders”) have the right to demand that the Company engage in a sale/refinancing process to consummate a Forced Transaction. A Forced Transaction includes a refinancing of the Series A Senior Preferred Stock or a sale of the Company. Upon consummation of any Forced Transaction, to the extent not prohibited by law, the Company is required to redeem all Series A Senior Preferred Stock, in cash, at a price per share equal to the then applicable Redemption Price.

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Holders of shares of Series A Senior Preferred Stock have no voting rights with respect to the Series A Senior Preferred Stock except as set forth in the Certificate of Designation, other documents entered into in connection with the Purchase Agreement and the transactions contemplated thereby, or as otherwise required by law. For so long as any Series A Senior Preferred Stock is outstanding, the Company is prohibited from taking certain actions without the prior consent of the Majority Holders as set forth in the Certificate of Designation which include: issuing equity securities ranking senior to or pari passu with the Series A Senior Preferred Stock, incurring indebtedness or liens, engaging in affiliate transactions, making restricted payments, consummating certain investments or asset dispositions, consummating a change of control transaction unless the Series A Senior Preferred Stock is redeemed in full, altering the Company’s organizational documents, and making material changes to the nature of the Company’s business.

Holders of Series A Senior Preferred Stock, voting as a separate class, have the right to designate and elect one director to serve on the Company’s board of directors until such time after the Refinancing Date that (i) as of any applicable fiscal quarter end, the Company’s trailing 12-month Consolidated Adjusted EBITDA (as defined in the Certificate of Designation) exceeds $100 million, or (ii) the Lead Purchaser ceases to hold at least 50.1% of the Series A Senior Preferred Stock held by it as of the Refinancing Date.

As a result of the 2022 Debt Refinancing and the Preferred Stock Financing, the Company added approximately $77.3 million of cash to its balance sheet.

Consolidated Cash Flows

The following table presents selected data from our condensed consolidated statements of cash flows:

	Three Months Ended
($ in thousands)	March 31, 2023		March 31, 2022
Net cash used in operating activities	$	(14,224)	$	(26,731)
Net cash used in investing activities	(5,079)		(8,658)
Net cash (used in) provided by financing activities	(761)		81,570
Net (decrease) increase in cash and cash equivalents	(20,064)		46,181
Cash and cash equivalents at beginning of period	83,139		48,616
Cash and cash equivalents at end of period	$	63,075	$	94,797

Three months ended March 31, 2023 compared to three months ended March 31, 2022

Net cash used in operating activities for the three months ended March 31, 2023 was $14.2 million compared to $26.7 million for the three months ended March 31, 2022, a decrease in cash used of $12.5 million. The decrease was primarily the result of approximately $4.1 million higher net losses as adjusted for non-cash items such as goodwill, intangible and other asset impairment charges and changes in fair value of warrant liability and contingent common shares liability during the three months ended March 31, 2022, $3.3 million lower cash outflows from operating leases during the three months ended March 31, 2023 and $4.3 million of partial application of MAAPP funds during the three months ended March 31, 2022 not recurring in 2023.

Net cash used in investing activities for the three months ended March 31, 2023 was $5.1 million compared to $8.7 million for the three months ended March 31, 2022, a decrease of approximately $3.6 million. The decrease was driven by lower capital expenditures during the three months ended March 31, 2023 primarily due to fewer clinic openings.

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Net cash used in financing activities for the three months ended March 31, 2023 was $0.8 million compared to $81.6 million of cash provided by financing activities for the three months ended March 31, 2022, a decrease in cash provided of approximately $82.3 million. The change was primarily driven by net cash inflows related to the 2022 Debt Refinancing (refer to Note 8 - Borrowings for further details) during the three months ended March 31, 2022.

Commitments and Contingencies

The Company may be subject to loss contingencies, such as legal proceedings and claims arising out of its business. The Company records accruals for such loss contingencies when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated. As of March 31, 2023, the Company did not record any accruals related to the outcomes of the legal matters described in Note 16 - Commitments and Contingencies. Refer to Note 16 to our condensed consolidated financial statements included elsewhere in this Quarterly Report for further information.

We enter into contractual obligations and commitments from time to time in the normal course of business, primarily related to our debt financing and operating leases. Refer to Notes 8 and 15 to our condensed consolidated financial statements included elsewhere in this Quarterly Report for further information. Additionally, the Company has contractual commitments related to cloud computing and telecommunication service agreements. Refer to Note 16 to our condensed consolidated financial statements included elsewhere in this Quarterly Report for further information.

Off-Balance Sheet Arrangements

As of March 31, 2023 and December 31, 2022, the Company did not have any off-balance sheet arrangements.

Critical Accounting Estimates

The discussion and analysis of the Company’s financial condition and results of operations is based upon the Company’s condensed consolidated financial statements, which have been prepared in accordance with U.S. GAAP. The preparation of the Company’s condensed consolidated financial statements requires its management to make estimates and judgments that affect the reported amounts of assets, liabilities, revenue and expenses and related disclosures. The Company’s management bases its estimates, assumptions and judgments on historical experience and various other factors that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Different assumptions and judgments would change the estimates used in the preparation of the Company’s condensed consolidated financial statements which, in turn, could change the results from those reported. In addition, actual results may differ from these estimates and such differences could be material to the Company’s financial position and results of operations.

Critical accounting estimates are those that the Company’s management considers the most important to the portrayal of the Company’s financial condition and results of operations because they require management's most difficult, subjective or complex judgments, often as a result of the need to make estimates about the effect of matters that are inherently uncertain. The Company’s critical accounting estimates in relation to its condensed consolidated financial statements include those related to:

•Patient revenue recognition and allowance for doubtful accounts

•Realization of deferred tax assets

•Goodwill and intangible assets

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Additional information related to our critical accounting estimates can be found in Note 2 - Basis of Presentation and Summary of Significant Accounting Policies of our audited consolidated financial statements and Part II, Item 7 included in our Annual Report on Form 10-K filed with the SEC on March 16, 2023.

Recent Accounting Pronouncements

For information regarding recent accounting pronouncements, refer to Note 2 - Basis of Presentation and Recent Accounting Standards in the accompanying condensed consolidated financial statements.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

As of March 31, 2023, the Company is exposed to interest rate variability with regard to its existing variable-rate debt instrument, which exposure primarily relates to movements in various interest rates, such as SOFR. The Company utilizes interest rate cap derivative instruments for purposes of hedging exposures related to such variable-rate cash payments. Based on our current hedging instruments as of March 31, 2023, a hypothetical increase of interest rates by 100 basis points would increase our annual cash interest expense by approximately $4.1 million and a hypothetical decrease of interest rates by 100 basis points would decrease our annual cash interest expense by approximately $4.3 million. As of March 31, 2023, the fair value of the Company’s derivative instruments consisted of assets of $1.7 million and liabilities of $0.2 million. As of December 31, 2022, the fair value of the Company’s derivative instruments consisted of assets of $5.0 million and liabilities of $0.1 million.

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Item 4. Controls and Procedures

Disclosure Controls and Procedures

Disclosure controls and procedures are controls and other procedures that are designed to ensure that information required to be disclosed in our reports filed or submitted under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed in our reports filed or submitted under the Exchange Act is accumulated and communicated to management to allow timely decisions regarding required disclosure.

We do not expect that our disclosure controls and procedures will prevent all errors and all instances of fraud. Disclosure controls and procedures, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the disclosure controls and procedures are met. Further, the design of disclosure controls and procedures must reflect the fact that there are resource constraints, and the benefits must be considered relative to their costs. Because of the inherent limitations in all disclosure controls and procedures, no evaluation of disclosure controls and procedures can provide absolute assurance that we have detected all control deficiencies and instances of fraud, if any. The design of disclosure controls and procedures also is based partly on certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions.

As required by Rules 13a-15 and 15d-15 under the Exchange Act, our Principal Executive Officer and our Principal Financial Officer carried out an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures as of March 31, 2023. Based upon their evaluation, our Principal Executive Officer and our Principal Financial Officer concluded that our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) were not effective as of March 31, 2023 due to the previously reported material weaknesses in internal control over financial reporting described below.

Management concluded that notwithstanding the existence of the material weaknesses, the condensed consolidated financial statements included in this Quarterly Report on Form 10-Q present fairly, in all material respects, the Company's financial position, results of operations and cash flows for the periods presented in conformity with U.S. GAAP.

Remediation Efforts with Respect to the Material Weaknesses

The Company's management, under the oversight of the Audit Committee, has continued the process of executing its remediation plan. Management has executed on the following measures in its remediation plan:

•revised the Company's tax staffing model, and implemented technology to assist in the income tax provision processes, in order to better position the capabilities and capacity of the Company's in-house tax department based on tax reporting requirements;

•refined the scope of the Company's external tax advisors to provide advice related to complex or unusual items, as well as advise on end-to-end corporate tax accounting matters;

•enhanced the design and precision of the Company's controls related to the income tax provision calculations and documentation, including controls related to the valuation allowance assessment.

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We believe the measures described above will contribute to remediating the control deficiencies we have identified and strengthen our internal control over financial reporting. We are committed to continuing to improve our internal control processes and will continue to review, optimize and enhance our financial reporting controls and procedures. As we continue to evaluate and work to improve our internal control over the income tax provision, we may take additional measures to address control deficiencies, or we may modify, or in appropriate circumstances not complete, certain of the remediation measures described above. These material weaknesses will not be considered remediated until the applicable controls operate for a sufficient period of time and management has concluded, through testing, that these controls are operating effectively.

Changes in Internal Control over Financial Reporting

Other than the changes related to the material weaknesses above, there have been no changes in our internal control over financial reporting during the fiscal quarter ended March 31, 2023 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II

Item 1. Legal Proceedings

From time to time, the Company may be involved in legal proceedings or subject to claims arising in the ordinary course of business. The outcome of any litigation and claims against the Company cannot be predicted with certainty, and the resolution of these matters could materially affect our future results of operations, cash flows, or financial condition. Refer to Note 16 - Commitments and Contingencies in the condensed consolidated financial statements included in Part I, Item 1, of this Form 10-Q for further details.

Item 1A. Risk Factors

There have been no material changes from the Risk Factors previously disclosed in our Annual Report on Form 10-K filed with the U.S. Securities and Exchange Commission on March 16, 2023.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Recent Sales of Unregistered Securities

During the quarter ended March 31, 2023, the Company did not have any sales of equity securities in transactions that were not registered under the Securities Act.

Issuer Purchases of Equity Securities

During the three months ended March 31, 2023, the Company withheld shares of our common stock in connection with employee minimum statutory tax withholding obligations payable upon the vesting of restricted stock, as follows:

	Total Number of Shares Purchased(1)	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Maximum Number of Shares that May Yet Be Purchased Under the Plans of Programs
January 1 - January 31, 2023	—	$	—	—	—
February 1 - February 28, 2023	—	$	—	—	—
March 1 - March 31, 2023	158,079	$	0.32	—	—
Total	158,079	$	0.32	—	—

(1) Represents shares delivered to or withheld by us in connection with employee minimum tax withholding obligations upon exercise or vesting of stock awards. No shares were purchased in the open market pursuant to a repurchase program.

Item 3. Defaults Upon Senior Securities

Not applicable.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information

None.

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Item 6. Exhibits

Exhibit Number	Description
10.1	Amended and Restated Transaction Support Agreement, dated April 17, 2023, by and among ATI Physical Therapy, Inc., ATI Holdings Acquisition, Inc., Wilco Intermediate Holdings, and other parties thereto (filed as exhibit 10.1 to the Current Report on Form 8-K of the Company on April 21, 2023 and incorporated herein by reference)
10.2	Amendment No. 2 to Credit Agreement, dated April 17, 2023, by and among ATI Holdings Acquisition, Inc., Wilco Intermediate Holdings, Inc., HPS Investment Partners, LLC, as Lender Representative and Barclays Bank PLC, as Administrative Agent (filed as exhibit 10.2 to the Current Report on Form 8-K of the Company on April 21, 2023 and incorporated herein by reference)
10.3	Second Lien Note Purchase Agreement, dated April 17, 2023, by and among ATI Physical Therapy, Inc., Wilco Holdco, Inc., Wilco Intermediate Holdings, Inc., ATI Holdings Acquisition, Inc., the Purchasers party thereto and Wilmington Savings Fund Society, FSB (filed as exhibit 10.3 to the Current Report on Form 8-K of the Company on April 21, 2023 and incorporated herein by reference)
31.1*	Certification of Principal Executive Officer pursuant to Rules 13a-14(a) and 15(d)-14(a) under the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*	Certification of Principal Financial Officer pursuant to Rules 13a-14(a) and 15(d)-14(a) under the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32*	Certification of Principal Executive Officer and Principal Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS*	XBRL Instance Document
101.SCH*	XBRL Taxonomy Extension Schema Document
101.CAL*	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF*	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB*	XBRL Taxonomy Extension Label Linkbase Document
101.PRE*	XBRL Taxonomy Extension Presentation Linkbase Document

* Filed or furnished herewith

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on our behalf by the undersigned thereunto duly authorized.

ATI PHYSICAL THERAPY, INC.

Date: May 8, 2023

/s/ JOSEPH JORDAN

Joseph Jordan

Chief Financial Officer

(Duly Authorized Officer and Principal Financial Officer)

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EX-31.1

EXHIBIT 31.1

 CERTIFICATION

I, Sharon Vitti, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of ATI Physical Therapy, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/ SHARON VITTI

Sharon Vitti

Chief Executive Officer
(Principal Executive Officer)

Date: May 8, 2023

EX-31.2

EXHIBIT 31.2

 CERTIFICATION

I, Joseph Jordan, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of ATI Physical Therapy, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/ JOSEPH JORDAN

Joseph Jordan

Chief Financial Officer

(Principal Financial Officer)

Date: May 8, 2023

EX-32

EXHIBIT 32

 CERTIFICATION OF PERIODIC REPORT

In connection with the Quarterly Report on Form 10-Q of ATI Physical Therapy, Inc. (the “Company”) for the quarterly period ended March 31, 2023, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Sharon Vitti, Chief Executive Officer of the Company, and Joseph Jordan, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

(1) the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ SHARON VITTI

Sharon Vitti

Chief Executive Officer
(Principal Executive Officer)

/s/ JOSEPH JORDAN

Joseph Jordan

Chief Financial Officer

(Principal Financial Officer)

May 8, 2023

This certification accompanies the Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not, except to the extent required by the Sarbanes-Oxley Act of 2002, be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.

A signed original of this written statement required by Section 906 of the Sarbanes-Oxley Act of 2002 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Cover - shares	3 Months Ended
	Mar. 31, 2023	May 03, 2023
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Transition Report	false
Entity File Number	001-39439
Entity Registrant Name	ATI Physical Therapy, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	85-1408039
Entity Address, Address Line One	790 Remington Boulevard
Entity Address, City or Town	Bolingbrook
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60440
City Area Code	630
Local Phone Number	296-2223
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		208,495,548
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001815849
Current Fiscal Year End Date	--12-31
Common Class A
Document Information [Line Items]
Title of 12(b) Security	Class A common stock, $0.0001 par value
Trading Symbol	ATIP
Security Exchange Name	NYSE
Redeemable Warrants, each whole warrant exercisable for one share of Class A common stock at an exercise price of $11.50 per share
Document Information [Line Items]
Title of 12(b) Security	Redeemable Warrants, each whole warrant exercisable for one share of Class A common stock at an exercise price of $11.50 per share
Trading Symbol	ATIP WS
Security Exchange Name	NYSE

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 63,075	$ 83,139
Accounts receivable (net of allowance for doubtful accounts of $52,549 and $47,620 at March 31, 2023 and December 31, 2022, respectively)	82,210	80,673
Prepaid expenses	9,373	13,526
Other current assets	6,722	10,040
Assets held for sale	5,469	6,755
Total current assets	166,849	194,133
Property and equipment, net	119,508	123,690
Operating lease right-of-use assets	224,725	226,092
Goodwill, net	286,458	286,458
Trade name and other intangible assets, net	246,398	246,582
Other non-current assets	1,823	2,030
Total assets	1,045,761	1,078,985
Current liabilities:
Accounts payable	10,245	12,559
Accrued expenses and other liabilities	47,564	53,672
Current portion of operating lease liabilities	51,911	47,676
Liabilities held for sale	1,503	2,614
Total current liabilities	111,223	116,521
Long-term debt, net	534,137	531,600
Warrant liability	296	98
Contingent common shares liability	2,126	2,835
Deferred income tax liabilities	18,948	18,886
Operating lease liabilities	216,396	218,424
Other non-current liabilities	1,821	1,834
Total liabilities	884,947	890,198
Commitments and contingencies (Note 16)
Mezzanine equity:
Series A Senior Preferred Stock, $0.0001 par value; 1.0 million shares authorized; 0.2 million shares issued and outstanding; $1,140.48 stated value per share at March 31, 2023; $1,108.34 stated value per share at December 31, 2022	140,340	140,340
Stockholders' equity:
Class A common stock, $0.0001 par value; 470.0 million shares authorized; 208.7 million shares issued, 199.5 million shares outstanding at March 31, 2023; 207.5 million shares issued, 198.4 million shares outstanding at December 31, 2022	20	20
Treasury stock, at cost, 0.24 million shares and 0.08 million shares at March 31, 2023 and December 31, 2022, respectively	(197)	(146)
Additional paid-in capital	1,380,150	1,378,696
Accumulated other comprehensive income	1,443	4,899
Accumulated deficit	(1,365,781)	(1,339,511)
Total ATI Physical Therapy, Inc. equity	15,635	43,958
Non-controlling interests	4,839	4,489
Total stockholders' equity	20,474	48,447
Total liabilities, mezzanine equity and stockholders' equity	$ 1,045,761	$ 1,078,985
Preferred stock, shares issued (in shares)	200,000	200,000
Preferred stock, shares outstanding (in shares)	200,000	200,000

XML

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 52,549	$ 47,620
Preferred stock, par value (dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	200,000	200,000
Preferred stock, shares outstanding (in shares)	200,000	200,000
Preferred stock, stated value (dollars per share)	$ 1,140.48	$ 1,108.34
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	470,000,000	470,000,000
Common stock, shares Issued (in shares)	208,700,000	207,500,000
Common stock, shares outstanding (in shares)	199,500,000	198,400,000
Treasury stock (in shares)	240,000	80,000.00

XML

Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net revenue	$ 166,932	$ 153,822
Cost of services:
Salaries and related costs	90,703	87,415
Rent, clinic supplies, contract labor and other	52,878	51,615
Provision for doubtful accounts	4,125	5,105
Total cost of services	147,706	144,135
Selling, general and administrative expenses	30,595	30,024
Goodwill, intangible and other asset impairment charges	0	155,741
Operating loss	(11,369)	(176,078)
Change in fair value of warrant liability	198	(1,677)
Change in fair value of contingent common shares liability	(709)	(24,334)
Interest expense, net	13,936	8,656
Other expense, net	354	2,781
Loss before taxes	(25,148)	(161,504)
Income tax expense (benefit)	62	(23,281)
Net loss	(25,210)	(138,223)
Net income (loss) attributable to non-controlling interests	1,060	(473)
Net loss attributable to ATI Physical Therapy, Inc.	$ (26,270)	$ (137,750)
Loss per share of Class A common stock:
Basic (in dollars per share)	$ (0.15)	$ (0.70)
Diluted (in dollars per share)	$ (0.15)	$ (0.70)
Weighted average shares outstanding:
Basic (in shares)	204,921	199,971
Diluted (in shares)	204,921	199,971
Net patient revenue
Net revenue	$ 150,754	$ 138,925
Other revenue
Net revenue	$ 16,178	$ 14,897

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Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net loss	$ (25,210)	$ (138,223)
Other comprehensive (loss) income:
Cash flow hedges	(3,456)	3,752
Comprehensive loss	(28,666)	(134,471)
Net income (loss) attributable to non-controlling interests	1,060	(473)
Comprehensive loss attributable to ATI Physical Therapy, Inc.	$ (29,726)	$ (133,998)

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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Non-Controlling Interests
Beginning balance (in shares) at Dec. 31, 2021		197,409,964
Beginning balance at Dec. 31, 2021	$ 511,507	$ 20	$ (95)	$ 1,351,597	$ 28	$ (847,132)	$ 7,089
Beginning balance (in shares) at Dec. 31, 2021			29,791
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of 2022 Warrants	19,725			19,725
Vesting of restricted shares distributed to holders of ICUs (in shares)		75,497
Issuance of common stock upon vesting of restricted stock units and awards (in shares)		40,613
Tax withholdings related to net share settlement of restricted stock awards (in shares)		(12,824)	12,824
Tax withholdings related to net share settlement of restricted stock units and awards	(22)		$ (22)
Non-cash share-based compensation	1,960			1,960
Other comprehensive income (loss)	3,752				3,752
Distribution to non-controlling interest holders	(473)						(473)
Net income (loss) attributable to non-controlling interests	(473)						(473)
Net loss attributable to ATI Physical Therapy, Inc.	(137,750)					(137,750)
Ending balance (in shares) at Mar. 31, 2022		197,513,250
Ending balance at Mar. 31, 2022	$ 398,226	$ 20	$ (117)	1,373,282	3,780	(984,882)	6,143
Ending balance (in shares) at Mar. 31, 2022			42,615
Beginning balance (in shares) at Dec. 31, 2022	198,400,000	198,357,356
Beginning balance at Dec. 31, 2022	$ 48,447	$ 20	$ (146)	1,378,696	4,899	(1,339,511)	4,489
Beginning balance (in shares) at Dec. 31, 2022	80,000.00		77,026
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted shares distributed to holders of ICUs (in shares)		37,545
Issuance of common stock upon vesting of restricted stock units and awards (in shares)		1,269,367
Tax withholdings related to net share settlement of restricted stock awards (in shares)	160,000	(158,079)	158,079
Tax withholdings related to net share settlement of restricted stock units and awards	$ (51)		$ (51)
Non-cash share-based compensation	1,454			1,454
Other comprehensive income (loss)	(3,456)				(3,456)
Distribution to non-controlling interest holders	(710)						(710)
Net income (loss) attributable to non-controlling interests	1,060						1,060
Net loss attributable to ATI Physical Therapy, Inc.	$ (26,270)					(26,270)
Ending balance (in shares) at Mar. 31, 2023	199,500,000	199,506,189
Ending balance at Mar. 31, 2023	$ 20,474	$ 20	$ (197)	$ 1,380,150	$ 1,443	$ (1,365,781)	$ 4,839
Ending balance (in shares) at Mar. 31, 2023	240,000		235,105

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Operating activities:
Net loss		$ (25,210)	$ (138,223)
Adjustments to reconcile net loss to net cash used in operating activities:
Goodwill, intangible and other asset impairment charges		0	155,741
Depreciation and amortization		9,691	10,111
Provision for doubtful accounts		4,125	5,105
Deferred income tax provision		62	(23,281)
Amortization of right-of-use assets		11,850	11,807
Non-cash share-based compensation		1,454	1,960
Amortization of debt issuance costs and original issue discount		838	660
Non-cash interest expense		1,736	0
Loss on extinguishment of debt		0	2,809
Loss (gain) on disposal and sale of assets		489	(219)
Increase (decrease) in fair value		198	(1,677)
Change in fair value of contingent common shares liability		(709)	(24,334)
Changes in:
Accounts receivable, net		(5,770)	(10,459)
Prepaid expenses and other current assets		4,073	588
Other non-current assets		33	14
Accounts payable		(2,439)	(928)
Accrued expenses and other liabilities		(6,168)	(544)
Operating lease liabilities		(8,476)	(11,555)
Other non-current liabilities		(1)	(37)
Medicare Accelerated and Advance Payment Program Funds		0	(4,269)
Net cash used in operating activities		(14,224)	(26,731)
Investing activities:
Purchases of property and equipment		(5,434)	(8,772)
Proceeds from sale of property and equipment		0	114
Net cash used in investing activities		(5,079)	(8,658)
Financing activities:
Proceeds from long-term debt		0	500,000
Deferred financing costs		0	(12,952)
Original issue discount		0	(10,000)
Principal payments on long-term debt		0	(555,048)
Proceeds from issuance of Series A Senior Preferred Stock		0	144,667
Proceeds from issuance of 2022 Warrants		0	20,333
Equity issuance costs and original issue discount		0	(4,935)
Taxes paid on behalf of employees for shares withheld		(51)	(22)
Distribution to non-controlling interest holders		(710)	(473)
Net cash (used in) provided by financing activities		(761)	81,570
Changes in cash and cash equivalents:
Net (decrease) increase in cash and cash equivalents		(20,064)	46,181
Cash and cash equivalents at beginning of period		83,139	48,616
Cash and cash equivalents at end of period		63,075	94,797
Supplemental noncash disclosures:
Derivative changes in fair value (1)	[1]	3,456	(3,752)
Purchases of property and equipment in accounts payable		1,771	2,223
Other supplemental disclosures:
Cash paid for interest		9,563	3,932
Cash received from hedging activities		3,418	0
Cash paid for taxes		0	35
Clinics
Investing activities:
Proceeds from sale of clinics		$ 355	$ 0

[1] Derivative changes in fair value related to unrealized loss (gain) on cash flow hedges, including the impact of reclassifications.

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Overview of the Company

3 Months Ended

Mar. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Overview of the Company

Overview of the Company

ATI Physical Therapy, Inc., together with its subsidiaries (herein referred to as “we,” “the Company,” “ATI Physical Therapy” and “ATI”), is a nationally recognized healthcare company, specializing in outpatient rehabilitation and adjacent healthcare services. The Company provides outpatient physical therapy services under the name ATI Physical Therapy and, as of March 31, 2023, had 909 clinics located in 24 states (as well as 19 clinics under management service agreements). The Company offers a variety of services within its clinics, including physical therapy to treat spine, shoulder, knee and neck injuries or pain; work injury rehabilitation services, including work conditioning and work hardening; hand therapy; and other specialized treatment services. The Company’s direct and indirect wholly-owned subsidiaries include, but are not limited to, Wilco Holdco, Inc., ATI Holdings Acquisition, Inc. and ATI Holdings, LLC.

Impact of COVID-19 and CARES Act

The coronavirus ("COVID-19") pandemic in the United States resulted in changes to our operating environment. We continue to closely monitor the impact of COVID-19 on all aspects of our business, and our priorities remain protecting the health and safety of employees and patients, maximizing the availability of services to satisfy patient needs and improving the operational and financial stability of our business. While we expect the disruption caused by COVID-19 and resulting impacts to diminish over time, we cannot predict the length of such impacts, and if such impacts continue for an extended period, it could have a continued effect on the Company’s results of operations, financial condition and cash flows, which could be material.

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) was signed into law providing reimbursement, grants, waivers and other funds to assist health care providers during the COVID-19 pandemic. The Company realized benefits under the CARES Act including, but not limited to, the receipt of Medicare Accelerated and Advance Payment Program ("MAAPP") funds and deferral of depositing the employer portion of Social Security taxes, interest-free and penalty-free. During the year ended December 31, 2022, the remaining obligations related to these benefits were applied and repaid. During the three months ended March 31, 2022, the Company applied $4.3 million in MAAPP funds against the outstanding liability at that time.

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Basis of Presentation and Recent Accounting Standards

3 Months Ended

Mar. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation and Recent Accounting Standards

Basis of Presentation and Recent Accounting Standards

Basis of presentation

The accompanying unaudited condensed consolidated financial statements of the Company were prepared in accordance with U.S. generally accepted accounting principles ("GAAP") for interim financial information and in accordance with the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations, although the Company believes that the disclosures are adequate to make the information presented not misleading.

Management believes the unaudited condensed consolidated financial statements for interim periods presented contain all necessary adjustments to state fairly, in all material respects, the Company's financial position, results of operations and cash flows for the interim periods presented.

Operating results for the three months ended March 31, 2023 are not necessarily indicative of the results the Company expects for the entire year. In addition, the influence of seasonality, changes in payor contracts, changes in rate per visit, changes in referral and visit volumes, strategic transactions, labor market dynamics and wage inflation, changes in laws and general economic conditions in the markets in which the Company operates and other factors impacting the Company's operations may result in any period not being comparable to the same period in previous years.

For further information regarding the Company's accounting policies and other information, the condensed consolidated financial statements should be read in conjunction with our audited consolidated financial statements and notes thereto for the year ended December 31, 2022 included in our Annual Report on Form 10-K filed with the SEC on March 16, 2023.

Liquidity and going concern

The accompanying unaudited condensed consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business within twelve months after the date that these condensed consolidated financial statements are issued.

The Company has negative operating cash flows, operating losses and net losses. For the three months ended March 31, 2023, the Company had cash flows used in operating activities of $14.2 million, operating loss of $11.4 million and net loss of $25.2 million. These results are, in part, due to recent trends experienced by the Company including a tight labor market for available physical therapy and other healthcare providers in the workforce, visit volume softness, decreases in rate per visit and increases in interest costs.

Further, based on current liquidity and projected cash use, the Company anticipates violation of its minimum liquidity covenant under its 2022 Credit Agreement (as defined in Note 8) within the next twelve months following the issuance date of the condensed consolidated financial statements as of and for the period ended March 31, 2023 (refer to Note 8 - Borrowings for further discussion of the 2022 Credit Agreement and related covenants).

These conditions and events raise substantial doubt about the Company's ability to continue as a going concern.

In addition, the report of the Independent Registered Public Accounting Firm accompanying the consolidated financial statements for the year ended December 31, 2022 contains an explanatory paragraph expressing substantial doubt about our ability to continue as a going concern. Absent an amendment or waiver, the 2022 Credit Agreement provides that the receipt of a report of the Independent Registered Public Accounting Firm containing an explanatory paragraph expressing substantial doubt about our ability to continue as a going concern could be an event of default, subject to certain exceptions. Pursuant to the Transaction Support Agreement, dated as of March 15, 2023, the First Lien Lenders have agreed that, prior to June 15, 2023 (the “Outside Closing Date”), they will forbear in the exercise of any rights, remedies, powers, privileges and defenses under the 2022 Credit Agreement arising on account of a default, alleged default or event of default (if any) resulting from the going concern explanatory paragraph in the report of the Independent Registered Public Accounting Firm accompanying the consolidated financial statements for the year ended December 31, 2022. However, if the Transaction (as defined and for which the terms are further described in Note 8) is not consummated on its terms or at all, the First Lien Lenders could claim that a default or event of default has occurred under the 2022 Credit Agreement. If such claim is not waived by the First Lien Lenders and the Company is unsuccessful in disputing any such claims (including with respect to the applicability of one of the enumerated exceptions to the 2022 Credit Agreement requirement), the Company could be considered to have an event of default after the expiration of the applicable cure periods.

In the event of a default, all amounts outstanding under the 2022 Credit Facility, together with any accrued interest, could then be declared immediately due and payable and could be reclassified to current in the Company's condensed consolidated financial statements for the period. A default on our obligations and an acceleration of our indebtedness by our lenders would have a material adverse impact on our business, financial condition, results of operations and cash flows, and may lead to events including bankruptcy, reorganization or insolvency.

In response to these conditions, management plans include improving operating results and cash flows and refinancing the Company's debt under its 2022 Credit Agreement.

The Company's plan to improve operating results and cash flow is dependent upon its ability to achieve its business plan to increase clinical staffing levels, improve clinician productivity, control costs and capital expenditures, increase patient visit volumes and referrals and stabilize rate per visit. There can be no assurance that it will be successful in any of these respects.

In order to refinance the Company’s debt under its 2022 Credit Agreement, the Company has agreed, subject to stockholder approval of the Transaction (as defined and for which the terms are further described in Note 8), to (i) a delayed draw new money financing in an aggregate principal amount of $25.0 million, comprised of (A) second lien PIK convertible notes (the “Notes”) and (B) shares of Series B Preferred Stock (as defined in Note 8), which will provide the holder thereof with voting rights such that the holders thereof will have the right to vote on an as-converted basis, (ii) facilitate the exchange of $100.0 million of the aggregate principal amount of the term loans under the 2022 Credit Agreement held by certain of the Preferred Equityholders for Notes and Series B preferred Stock and (iii) agree to certain other changes to the terms of the 2022 Credit Agreement, including modifications of the financial covenants thereunder. Holders of the Notes will also receive additional Notes upon the in-kind payment of interest on any outstanding Notes. The Notes will be convertible into shares of Class A common stock at a fixed conversion price.

If the Company does not consummate the Transaction on a timely basis as further described in Note 8 or otherwise access additional financing, the Company will need to consider other alternatives, including pursuing separate amendments to or waivers of the minimum liquidity covenant, the requirement to deliver audited financial statements without certain going concern qualifications, and other requirements under the 2022 Credit Agreement, as well as raising funds from other sources, obtaining alternate financing, disposal of assets, or pursuing other strategic alternatives to improve its liquidity position and business results. There can be no assurance that the Company will be successful in completing the Transaction or accessing such alternative options or financing when needed. Failure to do so could have a material adverse impact on our business, financial condition, results of operations and cash flows, and may lead to events including bankruptcy, reorganization or insolvency.

Management plans have not been fully implemented and, as a result, the Company has concluded that management’s plans do not alleviate substantial doubt about the Company’s ability to continue as a going concern.

The condensed consolidated financial statements do not include any adjustments relating to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that might result from the outcome of this uncertainty.

Use of estimates

The preparation of the condensed consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. The effect of any change in estimates will be recognized in the current period of the change.

Segment reporting

The Company reports segment information based on the management approach. The management approach designates the internal reporting used by management for making decisions and assessing performance as the source of the Company’s reportable segments. All of the Company’s operations are conducted within the United States. Our chief operating decision maker is our Chief Executive Officer, who reviews financial information presented on a consolidated basis for purposes of making decisions, assessing financial performance and allocating resources. We operate our business as one operating segment and therefore we have one reportable segment.

Cash, cash equivalents and restricted cash

Cash and cash equivalents include all cash balances and highly liquid investments with original maturities of three months or less when issued. Restricted cash consists of cash held as collateral in relation to the Company's corporate card agreement. Restricted cash included within cash and cash equivalents as presented within our condensed consolidated balance sheets as of March 31, 2023 and December 31, 2022, and our condensed consolidated statements of cash flows for the three months ended March 31, 2023 was $0.8 million.

Recently adopted accounting guidance

In October 2021, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Liabilities from Contracts with Customers, which provides guidance to improve the accounting for acquired revenue contracts with customers in a business combination by addressing diversity in practice. This ASU is effective for the Company on January 1, 2023, with early adoption permitted, and shall be applied on a prospective basis to business combinations that occur on or after the adoption date. The Company adopted this new accounting standard effective January 1, 2023. The adoption of this standard did not have a material impact on the Company's condensed consolidated financial statements.

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Divestitures

3 Months Ended

Mar. 31, 2023

Discontinued Operations and Disposal Groups [Abstract]

Divestitures

Divestitures

Clinics held for sale

During the fourth quarter of 2022, the Company classified the assets and liabilities of certain clinics as held for sale as a result of the Company's decision to sell the clinics. The divestiture transactions are anticipated to be completed within twelve months. The clinics did not meet the criteria to be classified as discontinued operations. During the first quarter of 2023, the Company completed a portion of its anticipated divestiture transactions, which were immaterial.

Major classes of assets and liabilities classified as held for sale as of March 31, 2023 and December 31, 2022 were as follows (in thousands):

	March 31, 2023		December 31, 2022
Accounts receivable, net	$	594	$	486
Prepaid expenses	20		23
Property and equipment, net	403		1,113
Operating lease right-of-use assets	1,251		1,929
Goodwill, net	3,192		3,192
Other non-current assets	9		12
Total assets held for sale	$	5,469	$	6,755
Accounts payable	$	8	$	22
Accrued expenses and other liabilities	80		201
Current portion of operating lease liabilities	376		685
Operating lease liabilities	1,039		1,706
Total liabilities held for sale	$	1,503	$	2,614

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Revenue from Contracts with Customers

3 Months Ended

Mar. 31, 2023

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Customers

Revenue from Contracts with Customers

The following table disaggregates net revenue by major service line for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Net patient revenue	$	150,754	$	138,925
ATI Worksite Solutions (1)	9,201		8,651
Management Service Agreements (1)	3,725		3,155
Other revenue (1)	3,252		3,091
	$	166,932	$	153,822

(1)ATI Worksite Solutions, Management Service Agreements and Other revenue are included within other revenue on the face of the condensed consolidated statements of operations.

The following table disaggregates net patient revenue for each associated payor class as a percentage of total net patient revenue for the periods indicated below:

	Three Months Ended
	March 31, 2023		March 31, 2022
Commercial	58.1	%	56.8	%
Government	23.6	%	23.6	%
Workers’ compensation	12.0	%	13.2	%
Other (1)	6.3	%	6.4	%
	100.0	%	100.0	%

(1) Other is primarily comprised of net patient revenue related to auto personal injury.

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Goodwill, Trade Name and Other Intangible Assets

3 Months Ended

Mar. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill, Trade Name and Other Intangible Assets

Goodwill, Trade Name and Other Intangible Assets

Changes in the carrying amount of goodwill consisted of the following (in thousands):

Goodwill at December 31, 2022 (1)	$	286,458
Impairment charges (2)	—
Goodwill at March 31, 2023	$	286,458

(1) Net of accumulated impairment losses of $1,045.7 million.

(2) The Company did not note any triggering events during the three months ended March 31, 2023 that resulted in the recording of an impairment loss.

The table below summarizes the Company’s carrying amount of trade name and other intangible assets at March 31, 2023 and December 31, 2022 (in thousands):

	March 31, 2023		December 31, 2022
Gross intangible assets:
ATI trade name (1)	$	245,000	$	245,000
Non-compete agreements	2,395		2,395
Other intangible assets	640		640
Accumulated amortization:
Accumulated amortization – non-compete agreements	(1,299)		(1,126)
Accumulated amortization – other intangible assets	(338)		(327)
Total trade name and other intangible assets, net	$	246,398	$	246,582

(1) Not subject to amortization.

Amortization expense for the three months ended March 31, 2023 and 2022 was immaterial. The Company estimates that amortization expense related to intangible assets is expected to be immaterial over the next five fiscal years and thereafter.

Interim impairment testing during 2022

During the quarter ended March 31, 2022, the Company identified an interim triggering event as a result of factors including potential changes in discount rates and decreases in share price. The Company determined that the combination of these factors constituted an interim triggering event that required further analysis with respect to potential impairment to goodwill, trade name indefinite-lived intangible and other assets.

As it was determined that it was more likely than not that the fair value of our trade name indefinite-lived intangible asset was below its carrying value, the Company performed an interim quantitative impairment test as of the March 31, 2022 balance sheet date. The Company utilized the relief from royalty method to estimate the fair value of the trade name indefinite-lived intangible asset. The key assumptions associated with determining the estimated fair value included projected revenue growth rates, the royalty rate, the discount rate and the terminal growth rate. As a result of the analysis, during the three months ended March 31, 2022, the Company recognized a $39.4 million non-cash interim impairment in goodwill, intangible and other asset impairment charges in its condensed consolidated statements of operations, which represented the difference between the estimated fair value of the Company’s trade name indefinite-lived intangible asset and its carrying value.

The Company evaluated its long-lived asset groups, including operating lease right-of-use assets that were evaluated based on clinic-specific cash flows and clinic-specific market factors, noting no material impairment.

As it was determined that it was more likely than not that the fair value of our single reporting unit was below its carrying value, the Company performed an interim quantitative impairment test with respect to goodwill. In order to determine the fair value of our single reporting unit, the Company utilized an average of a discounted cash flow analysis and comparable public company analysis. The key assumptions associated with determining the estimated fair value included projected revenue growth rates, earnings before interest, taxes, depreciation and amortization ("EBITDA") margins, the terminal growth rate, the discount rate and relevant market multiples. As a result of the analysis, during the three months ended March 31, 2022, the Company recognized a $116.3 million non-cash interim impairment in goodwill, intangible and other asset impairment charges in its condensed consolidated statements of operations, which represented the difference between the estimated fair value of the Company’s single reporting unit and its carrying value.

Fair value determinations require considerable judgment and are sensitive to changes in underlying assumptions, estimates and market factors. Estimating the fair value of the Company’s reporting unit and the indefinite-lived intangible asset requires us to make assumptions and estimates regarding our future plans, as well as industry, economic, and regulatory conditions. These assumptions and estimates include projected revenue growth rates, EBITDA margins, terminal growth rates, discount rates, relevant market multiples, royalty rates and other market factors. If current expectations of future growth rates, margins and cash flows are not met, or if market factors outside of our control change significantly, including discount rates, relevant market multiples, company share price and other market factors, then our reporting unit or the indefinite-lived intangible asset might become impaired in the future, negatively impacting our operating results and financial position. As the carrying amounts of goodwill and the Company’s trade name indefinite-lived intangible asset were impaired as of December 31, 2022 and written down to fair value, those amounts are more susceptible to an impairment risk if there are unfavorable changes in assumptions and estimates.

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Property and Equipment

3 Months Ended

Mar. 31, 2023

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and Equipment

Property and equipment consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):

	March 31, 2023		December 31, 2022
Equipment	$	38,170	$	38,102
Furniture and fixtures	17,334		17,215
Leasehold improvements	192,162		191,182
Automobiles	19		19
Computer equipment and software	103,954		102,651
Construction-in-progress	4,021		3,727
	355,660		352,896
Accumulated depreciation and amortization	(236,152)		(229,206)
Property and equipment, net (1)	$	119,508	$	123,690

(1) Excludes $0.4 million and $1.1 million reclassified as held for sale as of March 31, 2023 and December 31, 2022, respectively. Refer to Note 3 - Divestitures for additional information.

The following table presents the amount of depreciation and amortization expense related to property and equipment recorded in rent, clinic supplies, contract labor and other and selling, general and administrative expenses in the Company’s condensed consolidated statements of operations for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Rent, clinic supplies, contract labor and other	$	6,458	$	7,086
Selling, general and administrative expenses	3,049		2,835
Total depreciation expense	$	9,507	$	9,921

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Accrued Expenses and Other Liabilities

3 Months Ended

Mar. 31, 2023

Payables and Accruals [Abstract]

Accrued Expenses and Other Liabilities

Accrued Expenses and Other Liabilities

Accrued expenses and other liabilities consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):

	March 31, 2023		December 31, 2022
Salaries and related costs	$	16,786	$	28,949
Accrued professional fees	7,948		5,551
Credit balances due to patients and payors	6,734		6,117
Accrued interest	6,089		762
Accrued contract labor	2,685		4,483
Accrued occupancy costs	2,350		2,410
Other payables and accrued expenses	4,972		5,400
Total	$	47,564	$	53,672

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Borrowings

3 Months Ended

Mar. 31, 2023

Debt Disclosure [Abstract]

Borrowings

Borrowings

Long-term debt consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):

	March 31, 2023		December 31, 2022
Senior Secured Term Loan (1, 2) (due February 24, 2028)	$	505,217	$	503,481
Revolving Loans (3) (due February 24, 2027)	48,200		48,200
Less: unamortized debt issuance costs	(10,693)		(11,137)
Less: unamortized original issue discount	(8,587)		(8,944)
Total debt, net	534,137		531,600
Less: current portion of long-term debt	—		—
Long-term debt, net	$	534,137	$	531,600

(1) Interest rate of 12.6% and 12.1% at March 31, 2023 and December 31, 2022, respectively, with interest payable in designated installments at a variable interest rate. The effective interest rate for the Senior Secured Term Loan was 13.7% and 13.1% at March 31, 2023 and December 31, 2022, respectively.

(2) Beginning in the third quarter of 2022, the Company elected to pay a portion of its interest in-kind on its Senior Secured Term Loan by capitalizing and adding such interest to the principal amount of the debt. As of March 31, 2023, the Company recognized paid in-kind interest in the amount of $5.2 million.

(3) Interest rate of 8.8% and 8.3% at March 31, 2023 and December 31, 2022, respectively, with interest payable in designated installments at a variable interest rate.

2022 Credit Agreement

On February 24, 2022 (the "Refinancing Date"), the Company entered into various financing arrangements to refinance its previous long-term debt (the "2022 Debt Refinancing"). As part of the 2022 Debt Refinancing, ATI Holdings Acquisition, Inc. (the "Borrower"), an indirect subsidiary of ATI Physical Therapy, Inc., entered into a credit agreement among the Borrower, Wilco Intermediate Holdings, Inc. ("Holdings"), as loan guarantor, Barclays Bank PLC, as administrative agent and issuing bank, and a syndicate of lenders (the "2022 Credit Agreement"). The 2022 Credit Agreement provides a $550.0 million credit facility (the "2022 Credit Facility") that is comprised of a $500.0 million senior secured term loan (the "Senior Secured Term Loan") which was fully funded at closing and a $50.0 million "super priority" senior secured revolver (the "Revolving Loans") with a $10.0 million letter of credit sublimit.

The 2022 Credit Facility refinanced and replaced the Company's prior credit facility for which Barclays Bank PLC served as administrative agent for a syndicate of lenders. The Company paid $555.0 million to settle its previous term loan (the "2016 first lien term loan"). The Company accounted for the transaction as a debt extinguishment and recognized $2.8 million in loss on debt extinguishment during the three months ended March 31, 2022 related to the derecognition of the remaining unamortized deferred financing costs and unamortized original issue discount in conjunction with the debt repayment. The loss on debt extinguishment associated with the repayment of the 2016 first lien term loan has been reflected in other expense (income), net in the condensed consolidated statements of operations.

In connection with the 2022 Debt Refinancing, the Company also entered into a preferred stock purchase agreement, consisting of senior preferred stock with detachable warrants to purchase common stock for an aggregate stated value of $165.0 million (collectively, the “Preferred Stock Financing”). See Note 10 - Mezzanine and Stockholders' Equity for further information regarding the Preferred Stock Financing.

The Company capitalized debt issuance costs totaling $12.5 million related to the 2022 Credit Facility as well as an original issue discount of $10.0 million, which are amortized over the terms of the respective financing arrangements.

The Senior Secured Term Loan matures on February 24, 2028 and bears interest, at the Company's election, at a base interest rate of the Alternate Base Rate ("ABR"), as defined in the agreement, plus an applicable credit spread, or the Adjusted Term Secured Overnight Financing Rate ("SOFR"), as defined in the agreement, plus an applicable credit spread. The credit spread is determined based on a pricing grid and the Company's Secured Net Leverage Ratio. The Company may elect to pay 2.0% interest in-kind at a 0.5% premium during the first year under the agreement. The Company elected to pay a portion of its interest in-kind beginning in the third quarter of 2022. As of March 31, 2023, borrowings on the Senior Secured Term Loan bear interest at 3-month SOFR, subject to a 1.0% floor, plus 7.25% plus the 0.5% paid-in-kind interest premium.

The Revolving Loans are subject to a maximum borrowing capacity of $50.0 million and mature on February 24, 2027. Borrowings on the Revolving Loans bear interest, at the Company's election, at a base interest rate of the ABR, as defined in the agreement, plus an applicable credit spread, or the Adjusted Term SOFR Rate, as defined in the agreement, plus an applicable credit spread. The credit spread is determined based on a pricing grid and the Company's Secured Net Leverage Ratio. In December 2022, the Company drew $48.2 million in Revolving Loans. As of March 31, 2023, $48.2 million in Revolving Loans were outstanding and bearing interest at 3-month SOFR plus a credit spread of 4.1%.

The Company capitalized issuance costs of $0.5 million related to the Revolving Loans. Unamortized issuance costs of $0.2 million related to the revolving loans under the 2016 credit agreement were added to the balance of unamortized issuance costs to be amortized over the term of the Revolving Loans pursuant to debt extinguishment accounting guidance. Commitment fees on the Revolving Loans are payable quarterly at 0.5% per annum on the daily average undrawn portion for the quarter and are expensed as incurred. The balances of unamortized issuance costs related to the Revolving Loans were $0.6 million as of March 31, 2023, and $0.6 million as of December 31, 2022.

The 2022 Credit Facility is guaranteed by certain of the Company’s subsidiaries and is secured by substantially all of the assets of Holdings, the Borrower and the Borrower’s wholly owned subsidiaries, including a pledge of the stock of the Borrower, in each case, subject to customary exceptions.

The 2022 Credit Agreement contains customary covenants and restrictions, including financial and non-financial covenants. The financial covenants require the Company to maintain $30.0 million of minimum liquidity, as defined in the agreement, at each test date through the first quarter of 2024. Additionally, beginning in the second quarter of 2024, the Company must maintain a Secured Net Leverage Ratio, as defined in the agreement, not to exceed 7.00:1.00. The net leverage ratio covenant decreases in the third quarter of 2024 to 6.75:1.00 and further decreases in the first quarter of 2025 to 6.25:1.00, which remains applicable through maturity. The financial covenants are tested as of each fiscal quarter end for the respective periods. As of March 31, 2023, the Company is in compliance with its minimum liquidity financial covenant.

The 2022 Credit Facility contains customary representations and warranties, events of default, reporting and other affirmative covenants and negative covenants, including requirements related to the delivery of independent audit reports without certain going concern qualifications, limitations on indebtedness, liens, investments, negative pledges, dividends, junior debt payments, fundamental changes and asset sales and affiliate transactions. Failure to comply with the 2022 Credit Facility covenants and restrictions could result in an event of default under the 2022 Credit Facility, subject to customary cure periods. In such an event, all amounts outstanding under the 2022 Credit Facility, together with any accrued interest, could then be declared immediately due and payable.

Under the 2022 Credit Facility, the Company may be required to make certain mandatory prepayments upon the occurrence of certain events, including: an event of default, a prepayment asset sale or receipt of net insurance proceeds in excess of $15.0 million, or excess cash flows exceeding certain thresholds. A prepayment asset sale includes dispositions at fair market value, and net insurance proceeds is generally defined as insurance proceeds received on a covered loss or as a result of assets taken under the power of eminent domain, net of costs related to the matter.

The Company had letters of credit totaling $1.8 million and $1.8 million under the letter of credit sub-facility on the revolving credit facility as of March 31, 2023 and December 31, 2022, respectively. The letters of credit auto-renew on an annual basis and are pledged to insurance carriers as collateral.

Aggregate maturities of long-term debt at March 31, 2023 are as follows (in thousands):

2023 (remainder of year)	$	—
2024	—
2025	—
2026	—
2027	48,200
Thereafter	505,217
Total future maturities	553,417
Unamortized original issue discount and debt issuance costs	(19,280)
Total debt, net	$	534,137

Amended and Restated Transaction Support Agreement

On April 17, 2023, the Company entered into (i) an Amended and Restated Transaction Support Agreement (the "A&R TSA") to that certain Transaction Support Agreement, dated as of March 15, 2023, by and among the Company and certain of the Company’s affiliates, certain of its first lien lenders under the 2022 Credit Agreement (the “First Lien Lenders”), the administrative agent under the 2022 Credit Agreement, holders of its Series A Senior Preferred Stock (the “Preferred Equityholders”) and holders of the majority of its common stock (collectively, the “Parties”), (ii) Amendment No. 2 (the “Credit Agreement Amendment”) to the Company’s Credit Agreement, dated as of February 24, 2022, by and among the Borrower, Holdings, as loan guarantor, Barclays Bank PLC, as administrative agent and issuing bank, and the lenders party thereto (the “2022 Credit Agreement” and together with the Credit Agreement Amendment, the “Credit Agreement”), (iii) a Second Lien Note Purchase Agreement (the “Note Purchase Agreement”), by and among the Company, Wilco Holdco, Inc. (“Wilco”), Holdings, the Borrower, the purchasers from time to time party thereto (the “Purchasers”) and Wilmington Savings Fund Society, FSB, as purchaser representative and (iv) certain other definitive agreements relating to the comprehensive transaction to enhance the Company’s liquidity (the “Transaction,” and such documents referred to collectively as the “Signing Date Definitive Documents”).

Transaction Support Agreement

The A&R TSA sets forth the principal terms of a comprehensive transaction to enhance the Company’s liquidity. Pursuant to the A&R TSA, the Company and the Parties agreed to and appended thereto substantially final forms of the remaining definitive documents (together with the Signing Date Definitive Documents, the “Definitive Documents”) and subject to the terms and conditions thereof, the Parties have agreed to support, act in good faith and take all steps reasonably necessary and desirable to consummate the transactions referenced therein by the Outside Closing Date. Specifically, the Company has agreed, subject to stockholder approval of the Transaction, to a delayed draw new money financing in which the Company (i) may cause to be issued to the Purchasers an aggregate principal amount of $25.0 million (the “Delayed Draw Amounts”) in the form of a new stapled security, comprised of (A) second lien PIK convertible notes (the “Notes”) and (B) shares of Series B Preferred Stock (the "Series B Preferred Stock"), which will provide the holder thereof with voting rights such that the holders thereof will have the right to vote on an as-converted basis as if the conversion occurred at an initial price per share equal to the average closing price for the five trading days immediately preceding the date on which the Note Purchase Agreement was signed (the “NYSE Minimum Price”), (ii) will facilitate the exchange of $100.0 million of the aggregate principal amount of the term loans under the 2022 Credit Agreement held by certain of the Preferred Equityholders for Notes and Series B Preferred Stock and (iii) will agree to certain other changes to the terms of the 2022 Credit Agreement, including modifications of the financial covenants thereunder. Holders of the Notes will also receive additional Notes upon the in-kind payment of interest on any outstanding Notes. The Notes will be convertible into shares of Class A common stock, par value $0.0001 per share, of the Company (“Common Stock”) at a fixed conversion price of $0.25 (subject to adjustment as provided in the Note Purchase Agreement, the “Conversion Price”).

In addition, as part of the Transaction, (1) the Preferred Equityholders’ preexisting rights as holders of the Company’s Series A Senior Preferred Stock to designate and elect one director to the Company’s board of directors (the “Board”) will be revised to provide that (a) the Preferred Equityholders have the right to appoint three additional directors to the Board (resulting in the right of the Preferred Equityholders to appoint a total of four directors to the Board) until such time after the closing date of the Transaction (the "Closing Date") that the Lead Purchaser (in each case, as defined in certain of the transaction agreements entered into in connection with the original issuance of the Series A Preferred Stock) ceases to hold at least 50.1% of the Series A Preferred Stock held by it as of the Closing Date, one of whom must be unaffiliated with (and independent of) the Preferred Equityholders and who must meet the definition of “independent” under the listing standards of the New York Stock Exchange, and by the SEC; and (b) all such designee directors of the Preferred Equityholders will be subject to consideration by the Board (acting in good faith and consistent with their review of other Board candidates) and (2) the provision in the certificate of designation of the Company’s Series A Senior Preferred Stock that eliminated the Preferred Equityholders’ director designation rights upon the Company’s achievement of certain amounts of EBITDA will be deleted (and the equivalent provision in that certain Investors’ Rights Agreement, dated as of February 24, 2022, by and among the Company and the Preferred Equityholders listed therein, will also be deleted).

In addition, the A&R TSA contains certain representations, warranties and other agreements by the Company and the Parties. The Company’s and the Parties’ obligations under the A&R TSA are, and the closing of the Transaction is, subject to various customary terms and conditions set forth therein, including the execution and delivery of definitive documentation and approval by the Company’s stockholders.

Credit Agreement Amendment

The Credit Agreement Amendment provides, among other things, (i) a reduction of the thresholds applicable to the minimum liquidity financial covenant under the 2022 Credit Agreement for certain periods, (ii) a waiver of the requirement to comply with the Secured Net Leverage Ratio financial covenant under the 2022 Credit Agreement for the fiscal quarters ending June 30, 2024, September 30, 2024 and December 31, 2024 and a modification of the levels and certain component definitions applicable thereto in the fiscal quarters ending after December 31, 2024, (iii) an extension of the minimum liquidity financial covenant for the fiscal quarters in which the Secured Net Leverage Ratio financial covenant was waived, (iv) a waiver of the requirement for the Company to deliver audited financial statements without certain going concern qualifications for the years ended December 31, 2022, December 31, 2023, and December 31, 2024, (v) an increase in the interest rate payable on the existing term loans and revolving loans until the achievement of a specified financial metric and (vi) board representation and observer rights and other changes to the governance of the Company.

Note Purchase Agreement and Series B Preferred Stock

The Note Purchase Agreement contains customary representations, warranties, conditions and indemnification obligations by each party thereto. The representation, warranties and covenants contained therein were made only for the purposes of the Note Purchase Agreement, and as of specific dates, were solely for the benefit of the parties to such agreement and are subject to certain limitations set forth therein.

Draws. Draws on the Delayed Draw Amounts will be available beginning immediately on the Closing Date and ending on the date that is 18 months after the Closing Date, the Company may request either (i) two draws in an amount of $12.5 million each, or (ii) one draw in an amount of $25.0 million, subject in each case to, (a) projected liquidity at any time during the 6-month period following the date of the relevant draw being below either (i) $20 million or (ii) the prevailing minimum liquidity covenant threshold, as determined by reference to the Credit Agreement and (b) the consent of at least a majority of the disinterested directors on our Board. The Note Purchase Agreement also provides, subject to certain conditions (including the receipt of commitments therefor) and consent rights outlined in the Note Purchase Agreement for the ability of the Company to issue up to an additional $150.0 million in Notes. Proceeds of the Notes may be used for general corporate purposes, subject to certain exceptions.

Interest. The Notes will bear interest at a rate of 8.00% per annum, payable quarterly in-kind in the form of additional Notes by capitalizing the amount of such interest on the outstanding principal balance of the Notes in arrears on each interest payment date.

Maturity. The Notes will mature on August 24, 2028, unless earlier repurchased or converted.

Conversion. The Notes may be converted, in whole or in part (if the portion to be converted is $1,000 principal amount or an integral multiple thereof), at the option of the holder, into shares of Common Stock based on the Conversion Price.

Forced Conversion. On or after the second anniversary of the Closing Date, the Company may, at its option, from time to time, elect to convert a portion of the outstanding Notes into the number of shares of Common Stock issuable upon conversion based on the Conversion Price then in effect, subject in each case to the satisfaction of the conditions contained in the Note Purchase Agreement.

Adjustments to Conversion Price. The Conversion Price is subject to adjustment as a result of certain events including, but not limited to, certain issuances of Common Stock as a dividend or distribution, issuances of rights, options or warrants to purchase Common Stock at a price per share less than the average closing price per share of Common Stock for the ten trading days preceding the date of announcement of such issuance, effecting a share split or combination of the shares of Common Stock, issuance of a cash dividend or distribution and other issuances for a consideration per share less than the Conversion Price.

Guarantees; Collateral; Ranking. The Notes will be guaranteed by Wilco, Holdings, the Borrower, and the subsidiaries of ATI Holdings Acquisition, Inc. that guaranty the obligations under the Credit Agreement. The Notes will be secured by the same collateral that secures the obligations under the Credit Agreement.

Pursuant to the terms of an intercreditor and subordination agreement, the Notes (and the guarantees thereof) will rank junior in right of payment to the obligations under the Credit Agreement, and the liens on the collateral securing the Notes will rank junior to the liens on such collateral securing the obligations under the Credit Agreement.

Other Covenants. The Note Purchase Agreement includes affirmative and negative covenants (other than financial covenants) that are substantially consistent with the Credit Agreement, as well as customary events of default.

Voting. The Company will issue to each holder of Notes shares of Series B Preferred Stock in an amount equal to the quotient (rounded down to the nearest whole number) obtained by dividing (A) the amount paid by such holder to the Company for the Notes by (B) $1,000, resulting in more votes per share of Series B Preferred Stock than one share of Common Stock. Notwithstanding that one share of Series B Preferred Stock shall represent more votes than one share of Common Stock, the holders of shares of Series B Preferred Stock shall have full voting rights and powers equal to the voting rights and powers of the holders of Common Stock, and shall be entitled to notice of any stockholders' meeting in accordance with the bylaws of the Company, shall be entitled to vote, together with holders of Common Stock, with respect to any question upon which holders of Common Stock have the right to vote. Fractional votes shall not, however, be permitted, and any fractional voting rights available on an as-converted basis (after aggregating all shares into which shares of Series B Preferred Stock held by each holder could be converted) shall be rounded down to the nearest whole share of Series B Preferred Stock.

The Series B Preferred Stock shall not have any dividend or redemption rights and, in the event of any voluntary or involuntary liquidation, dissolution or winding up of the Company, the holders of Series B Preferred Stock shall be entitled to be paid out of the assets of the Company available for distribution to its stockholders, after satisfying any senior payment obligations and before any payment in respect of any Common Stock, an amount per share of Series B Preferred Stock equal to $0.0001.

The Series B Preferred Stock shall be governed in all respects by Delaware law.

The Transaction is subject to the execution of the Definitive Documents, as well as customary closing conditions. In addition, the closing of the Transaction and the matters contemplated by each of the A&R TSA, Credit Agreement Amendment and Note Purchase Agreement, are subject in each case to approval by the Company’s stockholders.

There is no assurance that the Transaction will be consummated on the terms as described above, on a timely basis or at all.

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Share-Based Compensation

3 Months Ended

Mar. 31, 2023

Share-Based Payment Arrangement [Abstract]

Share-Based Compensation

Share-Based Compensation

The Company recognizes compensation expense for all share-based compensation awarded to employees, net of forfeitures, using a fair value-based method. The grant-date fair value of each award is amortized to expense on a straight-line basis over the award’s vesting period. Compensation expense associated with share-based awards is included in salaries and related costs and selling, general and administrative expenses in the accompanying condensed consolidated statements of operations, depending on whether the award recipient is a clinic-level or corporate employee, respectively. Share-based compensation expense is adjusted for forfeitures as incurred.

ATI 2021 Equity Incentive Plan

The Company adopted the ATI Physical Therapy 2021 Equity Incentive Plan (the "2021 Plan") under which it may grant equity interests of ATI Physical Therapy, Inc., in the form of stock options, stock appreciation rights, restricted stock awards and restricted stock units, to members of management, key employees and independent directors of the Company and its subsidiaries. The Compensation Committee is authorized to make grants and to make various other decisions under the 2021 Plan. The maximum number of shares reserved for issuance under the 2021 Plan is approximately 21.3 million. The Company intends to amend, subject to stockholder approval, the 2021 Plan to increase the share reserve by 37.0 million Class A common shares. If approved, approximately 12.0 million shares would have been available for future grant as of March 31, 2023.

2023 grants

During the three months ended March 31, 2023, the Company granted restricted stock units ("RSUs") to certain employees and independent directors of the Company, which are subject to stockholder approval of an increase to the share reserve under the 2021 Plan. For the three months ended March 31, 2023, approximately 36.3 million RSUs were granted under the 2021 Plan. The weighted-average grant date fair values related to the RSUs granted were $0.34.

As of March 31, 2023, the unrecognized compensation expense related to outstanding RSUs was $16.6 million, to be recognized over a weighted-average period of 2.6 years.

Total non-cash share-based compensation expense recognized in the three months ended March 31, 2023 was approximately $1.5 million.

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Mezzanine and Stockholders' Equity

3 Months Ended

Mar. 31, 2023

Equity [Abstract]

Mezzanine and Stockholders' Equity

Mezzanine and Stockholders' Equity

ATI Physical Therapy, Inc. Series A Senior Preferred Stock

In connection with the 2022 Debt Refinancing, the Company issued 165,000 shares of non-convertible preferred stock (the "Series A Senior Preferred Stock") plus 5.2 million warrants to purchase shares of the Company's common stock at an exercise price of $3.00 per share (the "Series I Warrants") and warrants to purchase 6.3 million shares of the Company's common stock at an exercise price equal to $0.01 per share (the "Series II Warrants"). The shares of the Series A Senior Preferred Stock have a par value of $0.0001 per share and an initial stated value of $1,000 per share, for an aggregate initial stated value of $165.0 million. The Company is authorized to issue 1.0 million shares of preferred stock per the Certificate of Designation. As of March 31, 2023, there was 0.2 million shares of Series A Senior Preferred Stock issued and outstanding.

The gross proceeds received from the issuance of the Series A Senior Preferred Stock and the Series I and Series II Warrants were $165.0 million, which was allocated among the instruments based on the relative fair values of each instrument. Of the gross proceeds, $144.7 million was allocated to the Series A Senior Preferred Stock, $5.1 million to the Series I Warrants and $15.2 million to the Series II Warrants. The resulting discount on the Series A Senior Preferred Stock will be recognized as a deemed dividend when those shares are subsequently remeasured upon becoming redeemable or probable of becoming redeemable. The Company recognized $2.9 million in issuance costs and $1.4 million of original issue discount related to the Series A Senior Preferred Stock.

The following table reflects the components of proceeds related to the Series A Senior Preferred Stock (in thousands):

Gross proceeds allocated to Series A Senior Preferred Stock	$	144,667
Less: original issue discount	(1,447)
Less: issuance costs	(2,880)
Net proceeds received from issuance of Series A Senior Preferred Stock	$	140,340

The Series A Senior Preferred Stock has priority over the Company's Class A common stock and all other junior equity securities of the Company, and is junior to the Company's existing or future indebtedness and other liabilities (including trade payables), with respect to payment of dividends, distribution of assets, and all other liquidation, winding up, dissolution, dividend and redemption rights.

The Series A Senior Preferred Stock carries an initial dividend rate of 12.0% per annum (the "Base Dividend Rate"), payable quarterly in arrears. Dividends will be paid in-kind and added to the stated value of the Series A Senior Preferred Stock. The Company may elect to pay dividends on the Series A Senior Preferred Stock in cash beginning on the third anniversary of the Refinancing Date and, with respect to any such dividends paid in cash, the dividend rate then in effect will be decreased by 1.0%.

The Base Dividend Rate is subject to certain adjustments, including an increase of 1.0% per annum on the first day following the fifth anniversary of the Refinancing Date and on each one-year anniversary thereafter, and 2.0% per annum upon the occurrence of either an Event of Noncompliance (as defined in the Certificate of Designation) or a failure by the Company to redeem in full all Series A Senior Preferred Stock upon a Mandatory Redemption Event, which includes a change of control, liquidation, bankruptcy or certain restructurings. The paid in-kind dividends related to the Series A Preferred Stock were $5.3 million and $1.9 million for the three months ended March 31, 2023 and 2022, respectively. As of March 31, 2023, the accumulated paid in-kind dividends related to the Series A Preferred Stock were $23.2 million and the aggregate stated value was $188.2 million.

Changes in the aggregate stated value and stated value per share of the Series A Senior Preferred Stock consisted of the following (in thousands, except per share data):

	March 31, 2023		December 31, 2022
Aggregate stated value, beginning of period	$	182,876	$	165,000
Paid in-kind dividends(1)	5,303		17,876
Aggregate stated value, end of period	$	188,179	$	182,876
Preferred shares issued and outstanding, end of period	165		165
Stated value per share, end of period	$	1,140.48	$	1,108.34

(1) Changes in the stated value for the year ended December 31, 2022 represent changes since the Refinancing Date, which is when the Series A Senior Preferred Stock was issued and established.

The Company has the right to redeem the Series A Senior Preferred Stock, in whole or in part, at any time (subject to certain limitations on partial redemptions). The Redemption Price for each share of Series A Senior Preferred Stock is equal to the stated value subject to certain price adjustments depending on when such optional redemption takes place, if at all.

The Series A Senior Preferred Stock is perpetual and is not mandatorily redeemable at the option of the holders, except upon the occurrence of a Mandatory Redemption Event. Upon the occurrence of a Mandatory Redemption Event, to the extent not prohibited by law, the Company is required to redeem all Series A Senior Preferred Stock, in cash, at a price per share equal to the then applicable Redemption Price. Because the Series A Senior Preferred Stock is mandatorily redeemable contingent on certain events outside the Company’s control, such as a change in control, the Series A Senior Preferred Stock is classified as mezzanine equity in the Company's condensed consolidated balance sheets. Based on the Company’s assessment of the conditions which would trigger the redemption of the Series A Senior Preferred Stock, the Company has determined that the Series A Senior Preferred Stock is neither currently redeemable nor probable of becoming redeemable. Because the Series A Senior Preferred Stock is classified as mezzanine equity and is not considered redeemable or probable of becoming redeemable, the paid in-kind dividends that are added to the stated value do not impact the carrying value of the Series A Senior Preferred Stock in the Company’s condensed consolidated balance sheets. Should the Series A Senior Preferred Stock become probable of becoming redeemable, the Company will recognize changes in the redemption value of the Series A Senior Preferred Stock immediately as they occur and adjust the carrying amount accordingly at the end of each reporting period. As of March 31, 2023, the redemption value of the Series A Senior Preferred Stock was $188.2 million, which is the stated value.

If an Event of Noncompliance occurs, then the holders of a majority of the then outstanding shares of Series A Senior Preferred Stock (the “Majority Holders”) have the right to demand that the Company engage in a sale/refinancing process to consummate a Forced Transaction. A Forced Transaction includes a refinancing of the Series A Senior Preferred Stock or a sale of the Company. Upon consummation of any Forced Transaction, to the extent not prohibited by law, the Company is required to redeem all Series A Senior Preferred Stock, in cash, at a price per share equal to the then applicable Redemption Price.

Holders of shares of Series A Senior Preferred Stock have no voting rights with respect to the Series A Senior Preferred Stock except as set forth in the Certificate of Designation, other documents entered into in connection with the Purchase Agreement and the transactions contemplated thereby, or as otherwise required by law. For so long as any Series A Senior Preferred Stock is outstanding, the Company is prohibited from taking certain actions without the prior consent of the Majority Holders as set forth in the Certificate of Designation which include: issuing equity securities ranking senior to or pari passu with the Series A Senior Preferred Stock, incurring indebtedness or liens, engaging in affiliate transactions, making restricted payments, consummating certain investments or asset dispositions, consummating a change of control transaction unless the Series A Senior Preferred Stock is redeemed in full, altering the Company’s organizational documents, and making material changes to the nature of the Company’s business.

Holders of Series A Senior Preferred Stock, voting as a separate class, have the right to designate and elect one director to serve on the Company’s board of directors until such time after the Refinancing Date that (i) as of any applicable fiscal quarter end, the Company’s trailing 12-month Consolidated Adjusted EBITDA (as defined in the Certificate of Designation) exceeds $100 million, or (ii) the Lead Purchaser ceases to hold at least 50.1% of the Series A Senior Preferred Stock held by it as of the Refinancing Date.

2022 Warrants

In connection with the Preferred Stock Financing, the Company agreed to issue to the preferred stockholders the Series I Warrants entitling the holders thereof to purchase 5.2 million shares of the Company's common stock at an exercise price equal to $3.00 per share, exercisable for 5 years from the Refinancing Date; and the Series II Warrants entitling holders thereof to purchase 6.3 million shares of the Company's common stock, at an exercise price equal to $0.01 per share, exercisable for 5 years from the Refinancing Date (collectively, the "2022 Warrants"). Such number of shares of common stock purchasable pursuant to the 2022 Warrant Agreement and related exercise prices may be adjusted from time to time under certain scenarios as set forth in the 2022 Warrant Agreement, which relate to potential changes in the Company's capital structure.

The 2022 Warrants are classified as equity instruments and were initially recorded at an amount equal to the proceeds received from the Preferred Stock Financing allocated among the Series A Senior Preferred Stock, the Series I Warrants, and the Series II Warrants based upon their relative fair values. Of the gross proceeds, $5.1 million was allocated to the Series I Warrants and $15.2 million was allocated to the Series II Warrants. The Company recognized total issuance costs and original issue discount of approximately $0.2 million and $0.5 million related to the Series I Warrants and Series II Warrants, respectively.

The following table reflects the components of proceeds related to the 2022 Warrants (in thousands):

	Series I Warrants		Series II Warrants		Total
Gross proceeds allocated to 2022 Warrants	$	5,101	$	15,232	$	20,333
Less: original issue discount	(51)		(152)		(203)
Less: issuance costs	(102)		(303)		(405)
Net proceeds received from issuance of 2022 Warrants	$	4,948	$	14,777	$	19,725

Class A common stock

The Company is authorized to issue 470.0 million shares of Class A common stock with a par value of $0.0001 per share. Holders of the Company’s Class A common stock are entitled to one vote for each share on each matter on which they are entitled to vote. At March 31, 2023, there were 208.7 million shares of Class A common stock issued and 199.5 million shares outstanding.

As of March 31, 2023, shares of Class A common stock reserved for potential future issuance, on an as-if converted basis, were as follows (in thousands):

	March 31, 2023
Shares available for grant under the 2021 Plan(1)	12,041
2021 Plan share-based awards outstanding(2)	44,239
Earnout Shares reserved	15,000
2022 Warrants outstanding	11,498
IPO Warrants outstanding	9,867
Vesting Shares reserved(3)	8,625
Restricted shares(3)	364
Total shares of common stock reserved	101,634

(1) Represents shares of Class A common stock available for grant if the proposed increase to 2021 Plan share reserve and 2023 grants are approved by stockholders. Refer to Note 9 - Share-Based Compensation for further details.

(2) Represents share-based awards outstanding under the 2021 Plan if the proposed increase to 2021 Plan share reserve and 2023 grants are approved by stockholders. Refer to Note 9 - Share-Based Compensation for further details.

(3) Represents shares of Class A common stock legally issued, but not outstanding, as of March 31, 2023.

Treasury stock

During the three months ended March 31, 2023, the Company net settled 0.16 million shares of its Class A common stock related to employee tax withholding obligations associated with the Company's share-based compensation program. These shares are reflected at cost as treasury stock in the condensed consolidated financial statements. As of March 31, 2023, there were 0.24 million shares of treasury stock totaling $0.2 million recognized in the condensed consolidated balance sheets.

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IPO Warrant Liability

3 Months Ended

Mar. 31, 2023

Other Liabilities Disclosure [Abstract]

IPO Warrant Liability

IPO Warrant Liability

The Company has outstanding public warrants to purchase an aggregate of 6.9 million shares of the Company’s Class A common stock at an exercise price of $11.50 per share ("Public Warrants") and outstanding private placement warrants to purchase an aggregate of 3.0 million shares of the Company's Class A common stock at an exercise price of $11.50 per share ("Private Placement Warrants") (collectively, the "IPO Warrants"). There were no IPO Warrants exercised during the three months ended March 31, 2023.

The Company accounts for its outstanding IPO Warrants in accordance with the guidance contained in ASC 815-40, Derivatives and Hedging - Contracts on an Entity’s Own Equity, and determined that the IPO Warrants do not meet the criteria for equity treatment thereunder. As such, each IPO Warrant must be recorded as a liability and is subject to re-measurement at each balance sheet date. Refer to Note 13 - Fair Value Measurements for further details. Changes in fair value are recognized in change in fair value of warrant liability in the Company’s condensed consolidated statements of operations.

The following table presents the change in the fair value of Private Placement Warrants that is recognized in change in fair value of warrant liability in the condensed consolidated statements of operations for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Fair value, beginning of period	$	29	$	1,305
Increase (decrease) in fair value	60		(504)
Fair value, end of period	$	89	$	801

The following table presents the changes in the fair value of the Public Warrants that is recognized in change in fair value of warrant liability in the condensed consolidated statements of operations for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Fair value, beginning of period	$	69	$	3,036
Increase (decrease) in fair value	138		(1,173)
Fair value, end of period	$	207	$	1,863

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Contingent Common Shares Liability

3 Months Ended

Mar. 31, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Contingent Common Shares Liability

Contingent Common Shares Liability

Earnout Shares

Subject to the terms and conditions of the merger agreement between Wilco Holdco, Inc. and Fortress Value Acquisition Corp. II (herein referred to as "FAII" and "FVAC"), certain stockholders of Wilco Holdco, Inc. were provided the contingent right to receive, in the aggregate, up to 15.0 million shares of Class A common stock if, from the closing of the Company's business combination with FAII until the 10th anniversary thereof, the dollar volume-weighted average price (“VWAP”) of Class A common stock exceeds certain thresholds (the "Earnout Shares"). The Earnout Shares vest in three equal tranches of 5.0 million shares each if the VWAP of Class A common stock exceeds $12.00, $14.00 and $16.00 per share, respectively, over the designated period of time.

The Earnout Shares are subject to acceleration in the event of a sale or other change in control if the holders of Class A common stock would receive a per share price in excess of the applicable Earnout Shares price target. The Company accounts for the potential Earnout Shares as a liability in accordance with the guidance in ASC 480, Distinguishing Liabilities from Equity, and ASC 815, Derivatives and Hedging, and is subject to re-measurement at each balance sheet date. Changes in fair value are recognized in the Company’s condensed consolidated statements of operations. As of March 31, 2023, no Earnout Shares have been issued as none of the corresponding share price thresholds have been met.

The following table presents the changes in the fair value of the Earnout Shares that is recognized in change in fair value of contingent common shares liability in the condensed consolidated statements of operations for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Fair value, beginning of period	$	1,800	$	28,800
Decrease in fair value	(450)		(15,450)
Fair value, end of period	$	1,350	$	13,350

Refer to Note 13 - Fair Value Measurements for further details.

Vesting Shares

Subject to the terms and conditions of the sponsor letter agreement that was executed in connection with the merger agreement between Wilco Holdco, Inc. and FAII, 8.6 million shares of Class F common stock of FAII outstanding immediately prior to the Company's business combination with FAII converted to potential Class A common shares and became subject to vesting and forfeiture provisions (the "Vesting Shares"). The Vesting Shares vest in three equal tranches of 2.9 million shares each if the VWAP of Class A common stock exceeds $12.00, $14.00 and $16.00 per share, respectively, over the designated period of time. The Vesting Shares are subject to acceleration in the event of a sale or other change in control if the holders of Class A common stock would receive a per share price in excess of the applicable Vesting Shares price target.

The Company accounts for the Vesting Shares as a liability in accordance with the guidance in ASC 480, Distinguishing Liabilities from Equity, and ASC 815, Derivatives and Hedging, and is subject to re-measurement at each balance sheet date. Changes in fair value are recognized in the Company’s condensed consolidated statements of operations. As of March 31, 2023, no Vesting Shares are outstanding as none of the corresponding share price thresholds have been met.

The following table presents the changes in the fair value of the Vesting Shares that is recognized in change in fair value of contingent common shares liability in the condensed consolidated statements of operations for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Fair value, beginning of period	$	1,035	$	16,560
Decrease in fair value	(259)		(8,884)
Fair value, end of period	$	776	$	7,676

Refer to Note 13 - Fair Value Measurements for further details.

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Fair Value Measurements

3 Months Ended

Mar. 31, 2023

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The Company determines fair value measurements used in its condensed consolidated financial statements based upon the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels, with Level 1 having the highest priority and Level 3 having the lowest.

•Level 1: Observable inputs, which include unadjusted quoted prices in active markets for identical instruments.

•Level 2: Observable inputs other than Level 1 inputs, such as quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the instruments.

•Level 3: Unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions, such as valuations derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.

As of March 31, 2023 and December 31, 2022, respectively, the recorded values of cash and cash equivalents, accounts receivable, other current assets, accounts payable, accrued expenses and deferred revenue approximate their fair values due to the short-term nature of these items. Money market funds categorized in Level 1 of the fair value hierarchy are measured at fair value based on quoted market prices. As of March 31, 2023 and December 31, 2022, respectively, the fair value of money market fund investments included in cash and cash equivalents was zero and $30.0 million.

The Company's Senior Secured Term Loan and Revolving Loans are Level 2 fair value measures which have variable interest rates and, as of March 31, 2023, the recorded amounts approximate fair value. The Company utilizes the market approach valuation technique based on interest rates and credit data that are currently available to the Company for issuance of debt with similar terms or maturities.

Fair value measurement of share-based financial liabilities

The Company determined the fair value of the Public Warrant liability using Level 1 inputs.

The Company determined the fair value of the Private Placement Warrant liability using the price of the Public Warrants as a Level 2 input.

The Company determined the fair value of the Earnout Shares liability and Vesting Shares liability using Level 3 inputs. The contingent common shares contain specific market conditions to determine whether the shares vest based on the Company’s common stock price over a specified measurement period. Given the path-dependent nature of the requirement in which the shares are earned, a Monte-Carlo simulation was used to estimate the fair value of the liability. The Company’s common stock price was simulated to each measurement period based on the above methodology. In each iteration, the simulated stock price was compared to the conditions under which the shares vest. In iterations where the stock price corresponded to shares vesting, the future value of the contingent common shares was discounted back to present value. The fair value of the liability was estimated based on the average of all iterations of the simulation.

Inherent in a Monte-Carlo valuation model are assumptions related to expected stock-price volatility, expected term, risk-free interest rate and dividend yield. The Company estimates the volatility based on the historical volatility of certain guideline companies as of the valuation date. The risk-free interest rate is based on the U.S. Treasury zero-coupon yield curve on the grant date for a maturity similar to the expected term of the Earnout Shares and Vesting Shares. The dividend yield percentage is zero based on the Company's current expectations related to the payment of dividends during the expected term of the Earnout Shares or Vesting Shares.

The key inputs into the Monte-Carlo option pricing model were as follows as of March 31, 2023 and December 31, 2022 for the respective Level 3 instruments:

	Earnout Shares		Vesting Shares
	March 31, 2023	December 31, 2022	March 31, 2023	December 31, 2022
Risk-free interest rate	3.49%	3.88%	3.49%	3.88%
Volatility	77.30%	74.60%	77.30%	74.60%
Dividend yield	—%	—%	—%	—%
Expected term (years)	8.2	8.5	8.2	8.5
Share price	$0.25	$0.31	$0.25	$0.31

Refer to Note 12 - Contingent Common Shares Liability for further details on the change in fair value of the Earnout Shares and Vesting Shares.

Fair value measurement of interest rate derivative instruments

The Company is exposed to interest rate variability with regard to its existing variable-rate debt instrument, which exposure primarily relates to movements in various interest rates, such as SOFR. The Company utilizes interest rate cap derivative instruments for purposes of hedging exposures related to such variable-rate cash payments. The Company's interest rate caps are designated as cash flow hedging instruments.

The Company records derivatives on the balance sheet at fair value, which represents the estimated amounts it would receive or pay upon termination of the derivative prior to the scheduled expiration date. The fair value is derived from model-driven information based on observable Level 2 inputs, such as the London InterBank Offered Rate ("LIBOR") or SOFR forward rates. For derivatives designated and that qualify as cash flow hedges of interest rate risk, the gain or loss on the derivative is recorded in accumulated other comprehensive income and subsequently reclassified into interest expense in the same period(s) during which the hedged transaction affects earnings.

The following table presents the activity of cash flow hedges included in accumulated other comprehensive income (loss) for the three months ended March 31, 2023 and 2022, respectively (in thousands):

	Cash Flow Hedges
Balance as of December 31, 2022	$	4,899
Unrealized loss recognized in other comprehensive income before reclassifications	(99)
Reclassification to interest expense, net	(3,357)
Balance as of March 31, 2023	$	1,443
Balance as of December 31, 2021	$	28
Unrealized gain recognized in other comprehensive income before reclassifications	3,681
Reclassification to interest expense, net	71
Balance as of March 31, 2022	$	3,780

The following table presents the fair value of derivative assets and liabilities within the condensed consolidated balance sheets as of March 31, 2023 and December 31, 2022 (in thousands):

	March 31, 2023				December 31, 2022
	Assets		Liabilities		Assets		Liabilities
Derivatives designated as cash flow hedging instruments:
Other current assets	$	1,708	—		$	5,028	—
Other non-current assets	—		—		—		—
Accrued expenses and other liabilities	—		—		—		—
Other non-current liabilities	—		$	237	—		$	73

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Income Taxes

3 Months Ended

Mar. 31, 2023

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The effective tax rate and income tax expense for the three months ended March 31, 2023 were (0.2)% and $0.1 million, compared to an effective tax rate and income tax benefit of 14.4% and $23.3 million for the three months ended March 31, 2022.

The effective tax rate for the three months ended March 31, 2023 was estimated based on full-year 2023 forecast. The estimated effective tax rate was different than the statutory rate primarily due to the recognition of valuation allowances against federal and state net operating losses and other tax attributes, such as interest disallowances, for which future realization is uncertain. The estimated effective tax rate applicable to year-to-date losses as adjusted for discrete items including nontaxable fair value adjustments related to liability-classified share-based instruments, resulted in a tax expense of $0.1 million for the three months ended March 31, 2023.

The effective tax rate for the three months ended March 31, 2022 was estimated based on full-year 2022 forecast. The estimated effective tax rate was different than the statutory rate primarily due to book impairment of goodwill. There was no tax basis established in a significant component of the goodwill impaired. As a result, the impairment had a substantial permanent impact on the effective tax rate. The estimated effective tax rate applicable to year-to-date losses as adjusted for discrete items resulted in a tax benefit of $23.3 million for the three months ended March 31, 2022.

In evaluating the Company's ability to recover deferred income tax assets, all available positive and negative evidence is considered, including scheduled reversal of deferred tax liabilities, operating results and forecasts of future taxable income in each of the jurisdictions in which the Company operates. As of March 31, 2023, the Company determined that a significant portion of its federal and state net operating loss carryforwards with definite and certain indefinite carryforward periods and certain deferred tax assets are not more likely than not to be realized based on the weight of available evidence. As a result, the Company did not record a tax benefit against its current year losses due to the continued need for a valuation allowance.

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Leases

3 Months Ended

Mar. 31, 2023

Leases [Abstract]

Leases

Leases

The Company leases various facilities and office equipment for its physical therapy operations and administrative support functions under operating leases. The Company’s initial operating lease terms are generally between 7 and 10 years, and typically contain options to renew for varying terms. Right-of-use ("ROU") assets and lease liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. The amortization of operating lease ROU assets and the accretion of operating lease liabilities are reported together as fixed lease expense. The fixed lease expense is recognized on a straight-line basis over the life of the lease. If the ROU asset has been impaired, lease expense is no longer recognized on a straight-line basis. The lease liability continues to amortize using the effective interest method, while the ROU asset is subsequently amortized on a straight-line basis.

Lease costs are included as components of cost of services and selling, general and administrative expenses on the condensed consolidated statements of operations. Lease charges related to ROU asset impairments are included in goodwill, intangible and other asset impairment charges on the condensed consolidated statements of operations. Lease costs incurred by lease type were as follows for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Lease cost
Operating lease cost	$	16,689	$	16,703
Variable lease cost (1)	5,362		5,205
Total lease cost (2)	$	22,051	$	21,908

(1) Includes short term lease costs, which are immaterial.

(2) Sublease income was immaterial.

During the three months ended March 31, 2023 and 2022, the Company modified the lease terms for a significant number of its real estate leases, primarily related to lease term extensions and renewals in the normal course of business. Modifications during the years ended March 31, 2023 and 2022 resulted in an increase to the Company’s operating lease ROU assets and operating lease liabilities of approximately $5.9 million and $5.7 million, respectively.

Other supplemental quantitative disclosures were as follows for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	13,133	$	16,438
Right-of-use assets obtained in exchange for new operating lease liabilities	$	4,898	$	5,142

Average lease terms and discount rates as of March 31, 2023 and December 31, 2022 were as follows:

	March 31, 2023	December 31, 2022
Weighted-average remaining lease term:
Operating leases	5.8 years	5.9 years
Weighted-average discount rate:
Operating leases	7.1%	6.9%

Estimated undiscounted future lease payments under non-cancellable operating leases, along with a reconciliation of the undiscounted cash flows to operating lease liabilities, respectively, at March 31, 2023 were as follows (in thousands):

Year	Amount(1)
2023 (remainder of year)	$	51,578
2024	64,446
2025	54,923
2026	48,378
2027	37,201
Thereafter	73,641
Total undiscounted future cash flows	330,167
Less: Imputed Interest	(61,860)
Present value of future cash flows	$	268,307
Presentation on Balance Sheet:
Current	$	51,911
Non-current	$	216,396

(1) Excludes $0.4 million of current portion of operating lease liabilities and $1.0 million of operating lease liabilities, respectively, reclassified as held for sale as of March 31, 2023. Refer to Note 3 - Divestitures for additional information.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and ContingenciesThe Company has contractual commitments that are not required to be recognized in the condensed consolidated financial statements related to cloud computing and telecommunication services agreements. As of March 31, 2023, minimum amounts due under these agreements are approximately $15.2 million through January of 2026 subject to customary business terms and conditions.

From time to time, the Company is a party to legal proceedings, governmental audits and investigations that arise in the ordinary course of business. Management is not aware of any legal proceedings, governmental audits and investigations of which the outcome is probable to have a material adverse effect on the Company’s results of operations, cash flows or financial condition. The outcome of any litigation and claims against the Company cannot be predicted with certainty, and the resolution of current or future claims could materially affect our future results of operations, cash flows or financial condition.

Section 205 proceeding

On March 2, 2023, we filed a petition in the Delaware Court of Chancery (the "Court of Chancery") pursuant to Section 205 of the Delaware General Corporation Law ("DGCL"), seeking validation of an amendment to our certificate of incorporation increasing the authorized shares of our Class A Common Stock (as further described below) and the shares issued pursuant thereto.

At a special meeting of the stockholders of the Company held on June 15, 2021 (the “Special Meeting”), a majority of the then-outstanding shares of the Company’s Class A Common Stock and Class F Common Stock, voting together as a single class, voted to approve the Company’s Second Amended and Restated Certificate of Incorporation, which, among other things, increased the authorized shares of the Company’s Class A Common Stock from 200,000,000 shares to 450,000,000 shares (the “Class A Increase Amendment”). Notwithstanding the fact that the proxy statement relating to the Special Meeting did not disclose that a separate vote of the Class A Common Stock was required, a majority of the then-outstanding shares of Class A Common Stock voted in favor of the Class A Increase Amendment.

A recent decision of the Court of Chancery has created uncertainty regarding the validity of the Class A Increase Amendment and whether a separate vote of the majority of the then-outstanding shares of Class A Common Stock would have been required under Section 242(b)(2) of the DGCL.

The Company continues to believe that a separate vote of Class A Common Stock was not required to approve the Class A Increase Amendment. However, in light of the recent Court of Chancery decision, the Company filed a petition in the Court of Chancery pursuant to Section 205 of the DGCL seeking validation of the Class A Increase Amendment and the shares issued pursuant thereto to resolve any uncertainty with respect to those matters. Section 205 of the DGCL permits the Court of Chancery, in its discretion, to validate potentially defective corporate acts and stock after considering a variety of factors.

On March 3, 2023, the Court of Chancery granted the motion to expedite and set a hearing date for the petition to be heard. On March 17, 2023, the Court of Chancery heard and orally granted the petition. On March 17, 2023, the Court of Chancery issued a final order granting the petition, thereby validating the Class A Increase Amendment and all shares of capital stock of the Company issued in reliance on the Class A Increase Amendment, eliminating the previous uncertainty that had been introduced by a recent decision of the Court of Chancery regarding the validity of those provisions.

Stockholder class action complaints

On August 16, 2021, two purported ATI stockholders, Kevin Burbige and Ziyang Nie, filed a putative class action complaint in the U.S. District Court for the Northern District of Illinois against ATI, Labeed Diab, Joe Jordan, and Drew McKnight (collectively, the “ATI Individual Defendants”), and Joshua Pack, Marc Furstein, Leslee Cowen, Aaron Hood, Carmen Policy, Rakefet Russak-Aminoach, and Sunil Gulati (collectively, the “FVAC Defendants”).

On October 7, 2021, another purported ATI stockholder, City of Melbourne Firefighters' Retirement System ("City of Melbourne"), filed a nearly identical putative class action complaint in the U.S. District Court for the Northern District of Illinois against ATI, the ATI Individual Defendants, and the FVAC Defendants. On November 18, 2021, the court consolidated the cases and appointed The Phoenix Insurance Company Ltd. and The Phoenix Pension & Provident Funds as lead plaintiffs (together, “Lead Plaintiffs”).

On February 8, 2022, Lead Plaintiffs filed a consolidated amended complaint against ATI, the ATI Individual Defendants, and the FVAC Defendants, which asserts claims against (i) ATI and the ATI Individual Defendants under Section 10(b) of the Exchange Act; (ii) the ATI Individual Defendants under Section 20(a) of the Exchange Act (in connection with the Section 10(b) claim); (iii) all defendants under Section 14(a) of the Exchange Act; and (iv) the ATI Individual Defendants and the FVAC Defendants under Section 20(a) of the Exchange Act (in connection with the Section 14(a) claim). Lead Plaintiffs purport to assert these claims on behalf of those ATI stockholders who purchased or otherwise acquired their ATI shares between February 22, 2021 and October 19, 2021, inclusive, and/or held FVAC Class A common shares as of May 24, 2021 and were eligible to vote at FVAC’s June 15, 2021 special meeting. The consolidated amended complaint generally alleges that the proxy materials for the FVAC/ATI merger, as well as other ATI disclosures (including the press release announcing ATI’s financial results for the first quarter of 2021), were false and misleading (and, thus, in violation of Sections 10(b) and 14(a) of the Exchange Act) because they failed to disclose that: (i) ATI was experiencing attrition among its physical therapists; (ii) ATI faced increasing competition for clinicians in the labor market; (iii) as a result, ATI faced difficulty retaining therapists and incurred increased labor costs; (iv) also as a result, ATI would open fewer new clinics; and (v) also as a result, the defendants’ positive statements about ATI’s business, operations, and prospects were materially misleading and/or lacked a reasonable basis. Lead Plaintiffs, on behalf of themselves and the putative class, seek money damages in an unspecified amount and costs and expenses, including attorneys’ and experts’ fees. On April 11, 2022, defendants filed motions to dismiss the consolidated amended complaint, which were fully briefed as of July 25, 2022 and remain pending. The Company has determined that potential liabilities related to the consolidated amended complaint are not considered probable or reasonably estimable at this time.

On February 7, 2023, another purported ATI stockholder, Wendell Robinson, filed a putative class action complaint in the Court of Chancery of the State of Delaware against Fortress Acquisition Sponsor II, LLC, Andrew A. McKnight, Joshua A. Pack, Marc Furstein, Leslee Cowen, Aaron F. Hood, Carmen A. Policy, Rakefet Russak-Aminoach, Sunil Gulati, Daniel N. Bass, Micah B. Kaplan and Labeed Diab. The complaint asserts claims against: (i) Fortress Acquisition Sponsor II, LLC, Andrew A. McKnight, Joshua A. Pack, Marc Furstein, Leslee Cowen, Aaron F. Hood, Carmen A. Policy, Rafeket Russak-Aminoach, Sunil Gulati, Daniel N. Bass and Micah B. Kaplan for breach of fiduciary duty; and (ii) Labeed Diab for aiding and abetting breach of fiduciary duty. Plaintiff's allegations generally mirror those asserted in the federal stockholder class action described above, and Plaintiff further alleges that the alleged misrepresentations and omissions in the proxy materials for the FVAC/ATI merger prevented stockholders from making a fully informed decision on whether to approve the merger or have their shares redeemed. Defendants filed motions to dismiss on April 28, 2023, which remain pending.

Stockholder derivative complaint

Between December 1, 2021 and September 22, 2022, five purported ATI stockholders filed four derivative actions, purportedly on behalf of ATI, in the U.S. District Court for the Northern District of Illinois. On November 21, 2022, four of these stockholder plaintiffs, Vinay Kumar, Brendan Reginbald, Ziyang Nie and Julia Chang, filed a consolidated amended complaint against Labeed Diab, Joe Jordan, John Larsen, John Maldonado, Carmine Petrone, Christopher Krubert, Joanne Burns and James Parisi (collectively, the “Legacy ATI Defendants”), Drew McKnight, Joshua Pack, Aaron Hood, Carmen Policy, Marc Furstein, Leslee Cowen, Rafeket Russak-Aminoach, and Sunil Gulati (collectively, the “FVACII Individual Defendants”), and Fortress Acquisition Sponsor II, LLC and Fortress Investment Group LLC (together, the "Fortress Entity Defendants," and together with the FVACII Individual Defendants, the “FVACII Defendants”). The consolidated amended complaint asserts claims on behalf of ATI against: (i) the FVACII Defendants for breach of fiduciary duty; (ii) Fortress Acquisition Sponsor II, LLC and the Legacy ATI Defendants for aiding and abetting breach of fiduciary duty; (iii) Labeed Diab, Joe Jordan, and Drew McKnight for contribution under Section 21D of the Exchange Act; (iv) the FVACII Defendants under Section 14(a) of the Exchange Act; (v) the Legacy ATI Defendants for unjust enrichment; and (vi) all defendants for contribution and indemnification under Delaware law. Plaintiffs' allegations generally mirror those asserted in the stockholder class action described above. On January 20, 2023, defendants filed motions to dismiss the consolidated amended complaint, which remain pending. On March 3, 2023, in lieu of filing a response to defendants' motions to dismiss, Plaintiffs filed a motion for leave to file an amended complaint, which was fully briefed as of April 7, 2023 and remains pending. The Company has determined that potential liabilities related to the consolidated amended complaint are not considered probable or reasonably estimable at this time.

Insurance coverage complaint

On March 8, 2023, the Company filed a complaint against Federal Insurance Company, U.S. Specialty Insurance Company and other insurers titled ATI Physical Therapy, Inc. v. Federal Insurance Company et. al., Case No. N23C-03-074, in the Superior Court of the State of Delaware related to a coverage dispute and those certain insurers’ denial of coverage for the stockholder class action complaints and stockholder derivative complaint discussed above. The complaint asserts claims against Federal Insurance Company for breach of contract and bad faith, and claims for declaratory judgment as to Federal Insurance Company, U.S. Specialty Insurance Company, XL Specialty Insurance Company and the Company’s excess insurance carriers, seeking coverage for the stockholder class action complaints and stockholder derivative complaint. Defendants have until May 15, 2023 to respond to the complaint.

Regulatory matters

On November 5, 2021, the Company received from the SEC a voluntary request for the production of documents relating to the earnings forecast and financial information referenced in the Company's July 26, 2021 Form 8-K and related matters. The Company has subsequently received from the SEC additional requests for documents and information related to the same matters, and is cooperating with the SEC's review and investigation of those matters.

Indemnifications

The Company has agreed to indemnify its current and former directors and executive officers for costs associated with any fees, expenses, judgments, fines and settlement amounts incurred by them in any action or proceeding to which any of them are, or are threatened to be, made a party by reason of their service as a director or officer. The Company maintains director and officer insurance coverage that would generally enable it to recover a portion of any amounts paid. The ultimate cost of current or potential future litigation may exceed the Company’s current insurance coverages and may have a material adverse impact on our results of operations, cash flows and financial condition. The Company also may be subject to indemnification obligations by law with respect to the actions of its employees under certain circumstances and in certain jurisdictions.

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Loss per Share

3 Months Ended

Mar. 31, 2023

Earnings Per Share [Abstract]

Loss per Share

Loss per Share

Basic loss per share is computed by dividing net loss by the weighted average number of common shares outstanding during the period. For the three months ended March 31, 2023 and 2022, shares of Series A Senior Preferred stock are treated as participating securities and therefore are included in computing earnings per common share using the two-class method. The two-class method is an earnings allocation formula that calculates basic and diluted net earnings per common share for each class of common stock separately based on dividends declared and participation rights in undistributed earnings as if the earnings for the year had been distributed. For the three months ended March 31, 2023 and 2022, the income (loss) available to common stockholders is reduced by the amount of the cumulative dividend for the Series A Senior Preferred Stock that was issued as part of the 2022 Debt Refinancing.

The calculation of both basic and diluted loss per share for the periods indicated below was as follows (in thousands, except per share data):

	Three Months Ended
	March 31, 2023		March 31, 2022
Basic and diluted loss per share:
Net loss	$	(25,210)	$	(138,223)
Less: Net income (loss) attributable to non-controlling interests	1,060		(473)
Less: Series A Senior Preferred cumulative dividend	5,303		1,925
Loss available to common stockholders	$	(31,573)	$	(139,675)
Weighted average shares outstanding(1)	204,921		199,971
Basic and diluted loss per share	$	(0.15)	$	(0.70)

(1) Included within weighted average shares outstanding following the 2022 Debt Refinancing are common shares issuable upon the exercise of the Series II Warrants, as the Series II Warrants are exercisable at any time for nominal consideration. As such, the shares are considered to be outstanding for the purpose of calculating basic and diluted loss per share.

For the periods presented, the following securities were not required to be included in the computation of diluted shares outstanding, as their impact would have been anti-dilutive (in thousands):

	Three Months Ended
	March 31, 2023	March 31, 2022
Series I Warrants	5,226	5,226
IPO Warrants	9,867	9,867
Restricted shares(1)	364	1,248
Stock options	5,003	5,951
RSUs(2)	39,092	4,886
RSAs	144	366
Total	59,696	27,544

(1) Represents certain shares of Class A common stock legally issued, but not outstanding, as of March 31, 2023.

(2) Represents RSUs outstanding under the 2021 Plan if the proposed increase to 2021 Plan share reserve and 2023 grants are approved by stockholders. Refer to Note 9 - Share-Based Compensation for further details.

As the vesting thresholds have not yet been met as of the end of the reporting period, 15.0 million Earnout Shares and 8.6 million Vesting Shares were excluded from the basic and diluted shares outstanding calculations.

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Basis of Presentation and Recent Accounting Standards (Policies)

3 Months Ended

Mar. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of presentation

Basis of presentation

The accompanying unaudited condensed consolidated financial statements of the Company were prepared in accordance with U.S. generally accepted accounting principles ("GAAP") for interim financial information and in accordance with the rules and regulations of the U.S. Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations, although the Company believes that the disclosures are adequate to make the information presented not misleading.

Management believes the unaudited condensed consolidated financial statements for interim periods presented contain all necessary adjustments to state fairly, in all material respects, the Company's financial position, results of operations and cash flows for the interim periods presented.

Operating results for the three months ended March 31, 2023 are not necessarily indicative of the results the Company expects for the entire year. In addition, the influence of seasonality, changes in payor contracts, changes in rate per visit, changes in referral and visit volumes, strategic transactions, labor market dynamics and wage inflation, changes in laws and general economic conditions in the markets in which the Company operates and other factors impacting the Company's operations may result in any period not being comparable to the same period in previous years.

For further information regarding the Company's accounting policies and other information, the condensed consolidated financial statements should be read in conjunction with our audited consolidated financial statements and notes thereto for the year ended December 31, 2022 included in our Annual Report on Form 10-K filed with the SEC on March 16, 2023.

Liquidity and going concern

Liquidity and going concern

The accompanying unaudited condensed consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business within twelve months after the date that these condensed consolidated financial statements are issued.

The Company has negative operating cash flows, operating losses and net losses. For the three months ended March 31, 2023, the Company had cash flows used in operating activities of $14.2 million, operating loss of $11.4 million and net loss of $25.2 million. These results are, in part, due to recent trends experienced by the Company including a tight labor market for available physical therapy and other healthcare providers in the workforce, visit volume softness, decreases in rate per visit and increases in interest costs.

Further, based on current liquidity and projected cash use, the Company anticipates violation of its minimum liquidity covenant under its 2022 Credit Agreement (as defined in Note 8) within the next twelve months following the issuance date of the condensed consolidated financial statements as of and for the period ended March 31, 2023 (refer to Note 8 - Borrowings for further discussion of the 2022 Credit Agreement and related covenants).

These conditions and events raise substantial doubt about the Company's ability to continue as a going concern.

Use of estimates

Use of estimates

The preparation of the condensed consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. The effect of any change in estimates will be recognized in the current period of the change.

Segment reporting

Segment reporting

The Company reports segment information based on the management approach. The management approach designates the internal reporting used by management for making decisions and assessing performance as the source of the Company’s reportable segments. All of the Company’s operations are conducted within the United States. Our chief operating decision maker is our Chief Executive Officer, who reviews financial information presented on a consolidated basis for purposes of making decisions, assessing financial performance and allocating resources. We operate our business as one operating segment and therefore we have one reportable segment.

Cash, cash equivalents and restricted cash

Cash, cash equivalents and restricted cash

Cash and cash equivalents include all cash balances and highly liquid investments with original maturities of three months or less when issued. Restricted cash consists of cash held as collateral in relation to the Company's corporate card agreement. Restricted cash included within cash and cash equivalents as presented within our condensed consolidated balance sheets as of March 31, 2023 and December 31, 2022, and our condensed consolidated statements of cash flows for the three months ended March 31, 2023 was $0.8 million.

Recently adopted accounting guidance

Recently adopted accounting guidance

In October 2021, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Liabilities from Contracts with Customers, which provides guidance to improve the accounting for acquired revenue contracts with customers in a business combination by addressing diversity in practice. This ASU is effective for the Company on January 1, 2023, with early adoption permitted, and shall be applied on a prospective basis to business combinations that occur on or after the adoption date. The Company adopted this new accounting standard effective January 1, 2023. The adoption of this standard did not have a material impact on the Company's condensed consolidated financial statements.

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Divestitures (Tables)

3 Months Ended

Mar. 31, 2023

Discontinued Operations and Disposal Groups [Abstract]

Schedule of Disposal Groups, Including Discontinued Operations

Major classes of assets and liabilities classified as held for sale as of March 31, 2023 and December 31, 2022 were as follows (in thousands):

	March 31, 2023		December 31, 2022
Accounts receivable, net	$	594	$	486
Prepaid expenses	20		23
Property and equipment, net	403		1,113
Operating lease right-of-use assets	1,251		1,929
Goodwill, net	3,192		3,192
Other non-current assets	9		12
Total assets held for sale	$	5,469	$	6,755
Accounts payable	$	8	$	22
Accrued expenses and other liabilities	80		201
Current portion of operating lease liabilities	376		685
Operating lease liabilities	1,039		1,706
Total liabilities held for sale	$	1,503	$	2,614

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Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2023

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Net Operating Revenue By Major Service Line and Associated Payor Class

The following table disaggregates net revenue by major service line for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Net patient revenue	$	150,754	$	138,925
ATI Worksite Solutions (1)	9,201		8,651
Management Service Agreements (1)	3,725		3,155
Other revenue (1)	3,252		3,091
	$	166,932	$	153,822

(1)ATI Worksite Solutions, Management Service Agreements and Other revenue are included within other revenue on the face of the condensed consolidated statements of operations.

The following table disaggregates net patient revenue for each associated payor class as a percentage of total net patient revenue for the periods indicated below:

	Three Months Ended
	March 31, 2023		March 31, 2022
Commercial	58.1	%	56.8	%
Government	23.6	%	23.6	%
Workers’ compensation	12.0	%	13.2	%
Other (1)	6.3	%	6.4	%
	100.0	%	100.0	%

(1) Other is primarily comprised of net patient revenue related to auto personal injury.

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Goodwill, Trade Name and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in The Carrying Amount of Goodwill

Changes in the carrying amount of goodwill consisted of the following (in thousands):

Goodwill at December 31, 2022 (1)	$	286,458
Impairment charges (2)	—
Goodwill at March 31, 2023	$	286,458

(1) Net of accumulated impairment losses of $1,045.7 million.

(2) The Company did not note any triggering events during the three months ended March 31, 2023 that resulted in the recording of an impairment loss.

Schedule of Carrying Amounts of Indefinite-Lived Intangible Assets

The table below summarizes the Company’s carrying amount of trade name and other intangible assets at March 31, 2023 and December 31, 2022 (in thousands):

	March 31, 2023		December 31, 2022
Gross intangible assets:
ATI trade name (1)	$	245,000	$	245,000
Non-compete agreements	2,395		2,395
Other intangible assets	640		640
Accumulated amortization:
Accumulated amortization – non-compete agreements	(1,299)		(1,126)
Accumulated amortization – other intangible assets	(338)		(327)
Total trade name and other intangible assets, net	$	246,398	$	246,582

(1) Not subject to amortization.

Schedule of Carrying Amounts of Finite-Lived Intangible Assets

The table below summarizes the Company’s carrying amount of trade name and other intangible assets at March 31, 2023 and December 31, 2022 (in thousands):

	March 31, 2023		December 31, 2022
Gross intangible assets:
ATI trade name (1)	$	245,000	$	245,000
Non-compete agreements	2,395		2,395
Other intangible assets	640		640
Accumulated amortization:
Accumulated amortization – non-compete agreements	(1,299)		(1,126)
Accumulated amortization – other intangible assets	(338)		(327)
Total trade name and other intangible assets, net	$	246,398	$	246,582

(1) Not subject to amortization.

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Property and Equipment (Tables)

3 Months Ended

Mar. 31, 2023

Property, Plant and Equipment [Abstract]

Schedule of Property and Equipment and Depreciation Expense

Property and equipment consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):

	March 31, 2023		December 31, 2022
Equipment	$	38,170	$	38,102
Furniture and fixtures	17,334		17,215
Leasehold improvements	192,162		191,182
Automobiles	19		19
Computer equipment and software	103,954		102,651
Construction-in-progress	4,021		3,727
	355,660		352,896
Accumulated depreciation and amortization	(236,152)		(229,206)
Property and equipment, net (1)	$	119,508	$	123,690

(1) Excludes $0.4 million and $1.1 million reclassified as held for sale as of March 31, 2023 and December 31, 2022, respectively. Refer to Note 3 - Divestitures for additional information.

The following table presents the amount of depreciation and amortization expense related to property and equipment recorded in rent, clinic supplies, contract labor and other and selling, general and administrative expenses in the Company’s condensed consolidated statements of operations for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Rent, clinic supplies, contract labor and other	$	6,458	$	7,086
Selling, general and administrative expenses	3,049		2,835
Total depreciation expense	$	9,507	$	9,921

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Accrued Expenses and Other Liabilities (Tables)

3 Months Ended

Mar. 31, 2023

Payables and Accruals [Abstract]

Summary of Accrued Expenses and Other Liabilities

Accrued expenses and other liabilities consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):

	March 31, 2023		December 31, 2022
Salaries and related costs	$	16,786	$	28,949
Accrued professional fees	7,948		5,551
Credit balances due to patients and payors	6,734		6,117
Accrued interest	6,089		762
Accrued contract labor	2,685		4,483
Accrued occupancy costs	2,350		2,410
Other payables and accrued expenses	4,972		5,400
Total	$	47,564	$	53,672

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Borrowings (Tables)

3 Months Ended

Mar. 31, 2023

Debt Disclosure [Abstract]

Summary of Long-Term Debt

Long-term debt consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):

	March 31, 2023		December 31, 2022
Senior Secured Term Loan (1, 2) (due February 24, 2028)	$	505,217	$	503,481
Revolving Loans (3) (due February 24, 2027)	48,200		48,200
Less: unamortized debt issuance costs	(10,693)		(11,137)
Less: unamortized original issue discount	(8,587)		(8,944)
Total debt, net	534,137		531,600
Less: current portion of long-term debt	—		—
Long-term debt, net	$	534,137	$	531,600

(1) Interest rate of 12.6% and 12.1% at March 31, 2023 and December 31, 2022, respectively, with interest payable in designated installments at a variable interest rate. The effective interest rate for the Senior Secured Term Loan was 13.7% and 13.1% at March 31, 2023 and December 31, 2022, respectively.

(2) Beginning in the third quarter of 2022, the Company elected to pay a portion of its interest in-kind on its Senior Secured Term Loan by capitalizing and adding such interest to the principal amount of the debt. As of March 31, 2023, the Company recognized paid in-kind interest in the amount of $5.2 million.

(3) Interest rate of 8.8% and 8.3% at March 31, 2023 and December 31, 2022, respectively, with interest payable in designated installments at a variable interest rate.

Schedule of Aggregate Maturities of Long-Term Debt

Aggregate maturities of long-term debt at March 31, 2023 are as follows (in thousands):

2023 (remainder of year)	$	—
2024	—
2025	—
2026	—
2027	48,200
Thereafter	505,217
Total future maturities	553,417
Unamortized original issue discount and debt issuance costs	(19,280)
Total debt, net	$	534,137

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Mezzanine and Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2023

Equity [Abstract]

Schedule of Temporary Equity

The following table reflects the components of proceeds related to the Series A Senior Preferred Stock (in thousands):

Gross proceeds allocated to Series A Senior Preferred Stock	$	144,667
Less: original issue discount	(1,447)
Less: issuance costs	(2,880)
Net proceeds received from issuance of Series A Senior Preferred Stock	$	140,340

Changes in the aggregate stated value and stated value per share of the Series A Senior Preferred Stock consisted of the following (in thousands, except per share data):

	March 31, 2023		December 31, 2022
Aggregate stated value, beginning of period	$	182,876	$	165,000
Paid in-kind dividends(1)	5,303		17,876
Aggregate stated value, end of period	$	188,179	$	182,876
Preferred shares issued and outstanding, end of period	165		165
Stated value per share, end of period	$	1,140.48	$	1,108.34

(1) Changes in the stated value for the year ended December 31, 2022 represent changes since the Refinancing Date, which is when the Series A Senior Preferred Stock was issued and established.

Schedule of Components Of Proceeds Related to Warrants

The following table reflects the components of proceeds related to the 2022 Warrants (in thousands):

	Series I Warrants		Series II Warrants		Total
Gross proceeds allocated to 2022 Warrants	$	5,101	$	15,232	$	20,333
Less: original issue discount	(51)		(152)		(203)
Less: issuance costs	(102)		(303)		(405)
Net proceeds received from issuance of 2022 Warrants	$	4,948	$	14,777	$	19,725

Schedule of Shares of Class A Common Stock Reserved for Potential Future Issuance

As of March 31, 2023, shares of Class A common stock reserved for potential future issuance, on an as-if converted basis, were as follows (in thousands):

	March 31, 2023
Shares available for grant under the 2021 Plan(1)	12,041
2021 Plan share-based awards outstanding(2)	44,239
Earnout Shares reserved	15,000
2022 Warrants outstanding	11,498
IPO Warrants outstanding	9,867
Vesting Shares reserved(3)	8,625
Restricted shares(3)	364
Total shares of common stock reserved	101,634

(1) Represents shares of Class A common stock available for grant if the proposed increase to 2021 Plan share reserve and 2023 grants are approved by stockholders. Refer to Note 9 - Share-Based Compensation for further details.

(2) Represents share-based awards outstanding under the 2021 Plan if the proposed increase to 2021 Plan share reserve and 2023 grants are approved by stockholders. Refer to Note 9 - Share-Based Compensation for further details.

(3) Represents shares of Class A common stock legally issued, but not outstanding, as of March 31, 2023.

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IPO Warrant Liability (Tables)

3 Months Ended

Mar. 31, 2023

Other Liabilities Disclosure [Abstract]

Summary of Warrant Liability

The following table presents the change in the fair value of Private Placement Warrants that is recognized in change in fair value of warrant liability in the condensed consolidated statements of operations for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Fair value, beginning of period	$	29	$	1,305
Increase (decrease) in fair value	60		(504)
Fair value, end of period	$	89	$	801

The following table presents the changes in the fair value of the Public Warrants that is recognized in change in fair value of warrant liability in the condensed consolidated statements of operations for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Fair value, beginning of period	$	69	$	3,036
Increase (decrease) in fair value	138		(1,173)
Fair value, end of period	$	207	$	1,863

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Contingent Common Shares Liability (Tables)

3 Months Ended

Mar. 31, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Change in Fair Value of Earn Out Shares

The following table presents the changes in the fair value of the Earnout Shares that is recognized in change in fair value of contingent common shares liability in the condensed consolidated statements of operations for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Fair value, beginning of period	$	1,800	$	28,800
Decrease in fair value	(450)		(15,450)
Fair value, end of period	$	1,350	$	13,350

The following table presents the changes in the fair value of the Vesting Shares that is recognized in change in fair value of contingent common shares liability in the condensed consolidated statements of operations for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Fair value, beginning of period	$	1,035	$	16,560
Decrease in fair value	(259)		(8,884)
Fair value, end of period	$	776	$	7,676

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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2023

Fair Value Disclosures [Abstract]

Schedule of Key Fair Value Measurement Inputs

The key inputs into the Monte-Carlo option pricing model were as follows as of March 31, 2023 and December 31, 2022 for the respective Level 3 instruments:

	Earnout Shares		Vesting Shares
	March 31, 2023	December 31, 2022	March 31, 2023	December 31, 2022
Risk-free interest rate	3.49%	3.88%	3.49%	3.88%
Volatility	77.30%	74.60%	77.30%	74.60%
Dividend yield	—%	—%	—%	—%
Expected term (years)	8.2	8.5	8.2	8.5
Share price	$0.25	$0.31	$0.25	$0.31

Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)

The following table presents the activity of cash flow hedges included in accumulated other comprehensive income (loss) for the three months ended March 31, 2023 and 2022, respectively (in thousands):

	Cash Flow Hedges
Balance as of December 31, 2022	$	4,899
Unrealized loss recognized in other comprehensive income before reclassifications	(99)
Reclassification to interest expense, net	(3,357)
Balance as of March 31, 2023	$	1,443
Balance as of December 31, 2021	$	28
Unrealized gain recognized in other comprehensive income before reclassifications	3,681
Reclassification to interest expense, net	71
Balance as of March 31, 2022	$	3,780

Schedule of Fair Value of Derivative Assets and Liabilities

The following table presents the fair value of derivative assets and liabilities within the condensed consolidated balance sheets as of March 31, 2023 and December 31, 2022 (in thousands):

	March 31, 2023				December 31, 2022
	Assets		Liabilities		Assets		Liabilities
Derivatives designated as cash flow hedging instruments:
Other current assets	$	1,708	—		$	5,028	—
Other non-current assets	—		—		—		—
Accrued expenses and other liabilities	—		—		—		—
Other non-current liabilities	—		$	237	—		$	73

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Leases (Tables)

3 Months Ended

Mar. 31, 2023

Leases [Abstract]

Schedule of Lease Cost, Supplemental Cash Flow, and Other Information Related to Leases

Lease costs incurred by lease type were as follows for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Lease cost
Operating lease cost	$	16,689	$	16,703
Variable lease cost (1)	5,362		5,205
Total lease cost (2)	$	22,051	$	21,908

(1) Includes short term lease costs, which are immaterial.

(2) Sublease income was immaterial.

Other supplemental quantitative disclosures were as follows for the periods indicated below (in thousands):

	Three Months Ended
	March 31, 2023		March 31, 2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	13,133	$	16,438
Right-of-use assets obtained in exchange for new operating lease liabilities	$	4,898	$	5,142

Average lease terms and discount rates as of March 31, 2023 and December 31, 2022 were as follows:

	March 31, 2023	December 31, 2022
Weighted-average remaining lease term:
Operating leases	5.8 years	5.9 years
Weighted-average discount rate:
Operating leases	7.1%	6.9%

Schedule of Estimated Undiscounted Future Lease Payments

Estimated undiscounted future lease payments under non-cancellable operating leases, along with a reconciliation of the undiscounted cash flows to operating lease liabilities, respectively, at March 31, 2023 were as follows (in thousands):

Year	Amount(1)
2023 (remainder of year)	$	51,578
2024	64,446
2025	54,923
2026	48,378
2027	37,201
Thereafter	73,641
Total undiscounted future cash flows	330,167
Less: Imputed Interest	(61,860)
Present value of future cash flows	$	268,307
Presentation on Balance Sheet:
Current	$	51,911
Non-current	$	216,396

(1) Excludes $0.4 million of current portion of operating lease liabilities and $1.0 million of operating lease liabilities, respectively, reclassified as held for sale as of March 31, 2023. Refer to Note 3 - Divestitures for additional information.

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Loss per Share (Tables)

3 Months Ended

Mar. 31, 2023

Earnings Per Share [Abstract]

Schedule of Calculation of Both Basic and Diluted Loss Per Share

The calculation of both basic and diluted loss per share for the periods indicated below was as follows (in thousands, except per share data):

	Three Months Ended
	March 31, 2023		March 31, 2022
Basic and diluted loss per share:
Net loss	$	(25,210)	$	(138,223)
Less: Net income (loss) attributable to non-controlling interests	1,060		(473)
Less: Series A Senior Preferred cumulative dividend	5,303		1,925
Loss available to common stockholders	$	(31,573)	$	(139,675)
Weighted average shares outstanding(1)	204,921		199,971
Basic and diluted loss per share	$	(0.15)	$	(0.70)

(1) Included within weighted average shares outstanding following the 2022 Debt Refinancing are common shares issuable upon the exercise of the Series II Warrants, as the Series II Warrants are exercisable at any time for nominal consideration. As such, the shares are considered to be outstanding for the purpose of calculating basic and diluted loss per share.

Schedule of Antidilutive Securities Excluded From Computation of Diluted Shares Outstanding

For the periods presented, the following securities were not required to be included in the computation of diluted shares outstanding, as their impact would have been anti-dilutive (in thousands):

	Three Months Ended
	March 31, 2023	March 31, 2022
Series I Warrants	5,226	5,226
IPO Warrants	9,867	9,867
Restricted shares(1)	364	1,248
Stock options	5,003	5,951
RSUs(2)	39,092	4,886
RSAs	144	366
Total	59,696	27,544

(1) Represents certain shares of Class A common stock legally issued, but not outstanding, as of March 31, 2023.

(2) Represents RSUs outstanding under the 2021 Plan if the proposed increase to 2021 Plan share reserve and 2023 grants are approved by stockholders. Refer to Note 9 - Share-Based Compensation for further details.

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Overview of the Company (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2023 clinic state
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of stores		909
Number of states in which entity operates | state		24
Number of stores under management service agreements		19
CARES Act, MAAPP Funds
Unusual or Infrequent Item, or Both [Line Items]
Proceeds from sale of Home Health service line | $	$ 4.3

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Basis of Presentation and Recent Accounting Standards - Narrative (Details)	3 Months Ended
	Mar. 31, 2023 USD ($) segment	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Feb. 24, 2022 USD ($)
Finite-Lived Intangible Assets [Line Items]
Net cash used in operating activities	$ (14,224,000)	$ (26,731,000)
Operating loss	(11,369,000)	(176,078,000)
Net loss	(25,210,000)	$ (138,223,000)
Accumulated deficit	$ (1,365,781,000)		$ (1,339,511,000)
Number of operating segments | segment	1
Number of reportable segments | segment	1
Restricted cash included within cash and cash equivalents	$ 800,000
2022 Credit Agreement
Finite-Lived Intangible Assets [Line Items]
Debt amount				$ 550,000,000

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Divestitures - Assets and Liabilities Classified as Held For Sale (Details) - Disposal Group, Held-for-sale, Not Discontinued Operations - 2022 Clinics Held for Sale - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable, net	$ 594	$ 486
Prepaid expenses	20	23
Property and equipment, net	403	1,113
Operating lease right-of-use assets	1,251	1,929
Goodwill, net	3,192	3,192
Other non-current assets	9	12
Total assets held for sale	5,469	6,755
Accounts payable	8	22
Accrued expenses and other liabilities	80	201
Current portion of operating lease liabilities	376	685
Operating lease liabilities	1,039	1,706
Total liabilities held for sale	$ 1,503	$ 2,614

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Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Net revenue	$ 166,932	$ 153,822
Net patient revenue
Disaggregation of Revenue [Line Items]
Net revenue	$ 150,754	$ 138,925
Net operating revenue (as percent)	100.00%	100.00%
Net patient revenue | Commercial
Disaggregation of Revenue [Line Items]
Net operating revenue (as percent)	58.10%	56.80%
Net patient revenue | Government
Disaggregation of Revenue [Line Items]
Net operating revenue (as percent)	23.60%	23.60%
Net patient revenue | Workers’ compensation
Disaggregation of Revenue [Line Items]
Net operating revenue (as percent)	12.00%	13.20%
Net patient revenue | Other
Disaggregation of Revenue [Line Items]
Net operating revenue (as percent)	6.30%	6.40%
ATI Worksite Solutions
Disaggregation of Revenue [Line Items]
Net revenue	$ 9,201	$ 8,651
Management Service Agreements
Disaggregation of Revenue [Line Items]
Net revenue	3,725	3,155
Other revenue
Disaggregation of Revenue [Line Items]
Net revenue	$ 3,252	$ 3,091

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Goodwill, Trade Name and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 286,458
Impairment charges	0	$ (116,300)
Goodwill, Ending Balance	$ 286,458
Accumulated goodwill impairment loss			$ 1,045,700

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Goodwill, Trade Name and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Trade name and other intangible assets, net	$ 246,398	$ 246,582
ATI trade name
Indefinite-lived Intangible Assets [Line Items]
Gross intangible assets	245,000	245,000
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets:	2,395	2,395
Accumulated amortization:	(1,299)	(1,126)
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets:	640	640
Accumulated amortization:	$ (338)	$ (327)

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Goodwill, Trade Name and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Indefinite-lived Intangible Assets [Line Items]
Goodwill impairment loss	$ 0	$ 116,300
ATI trade name
Indefinite-lived Intangible Assets [Line Items]
Impairment of indefinite lived intangible assets		$ 39,400

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Property and Equipment - Carrying Amount (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 355,660	$ 352,896
Accumulated depreciation and amortization	(236,152)	(229,206)
Property and equipment, net	119,508	123,690
Disposal Group, Held-for-sale, Not Discontinued Operations | 2022 Clinics Held for Sale
Property, Plant and Equipment [Line Items]
Disposal group, including discontinued operation, property, plant and equipment	403	1,113
Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	38,170	38,102
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	17,334	17,215
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	192,162	191,182
Automobiles
Property, Plant and Equipment [Line Items]
Property and equipment, gross	19	19
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	103,954	102,651
Construction-in-progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 4,021	$ 3,727

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Property and Equipment - Depreciation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Property, Plant and Equipment [Line Items]
Total depreciation expense	$ 9,507	$ 9,921
Rent, clinic supplies, contract labor and other
Property, Plant and Equipment [Line Items]
Total depreciation expense	6,458	7,086
Selling, general and administrative expenses
Property, Plant and Equipment [Line Items]
Total depreciation expense	$ 3,049	$ 2,835

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Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Payables and Accruals [Abstract]
Salaries and related costs	$ 16,786	$ 28,949
Accrued professional fees	7,948	5,551
Credit balances due to patients and payors	6,734	6,117
Accrued interest	6,089	762
Accrued contract labor	2,685	4,483
Accrued occupancy costs	2,350	2,410
Other payables and accrued expenses	4,972	5,400
Accrued expenses and other liabilities	$ 47,564	$ 53,672

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Borrowings - Long-Term Debt (Details) - USD ($) $ in Thousands		3 Months Ended
	Mar. 31, 2023	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Debt Instrument [Line Items]
Total future maturities	$ 553,417	$ 553,417
Less: unamortized debt issuance costs	(10,693)	(10,693)		$ (11,137)
Less: unamortized original issue discount	(8,587)	(8,587)		(8,944)
Total debt, net	534,137	534,137		531,600
Less: current portion of long-term debt	0	0		0
Long-term debt, net	$ 534,137	534,137		$ 531,600
Paid in-kind interest amount		$ 1,736	$ 0
Senior Secured Term Loan (due February 24, 2028)
Debt Instrument [Line Items]
State interest rate (in percent)	12.60%	12.60%		12.10%
Effective interest rate (in percent)	13.70%	13.70%		13.10%
Senior Secured Term Loan (due February 24, 2028) | Secured Debt
Debt Instrument [Line Items]
Total future maturities	$ 505,217	$ 505,217		$ 503,481
Paid in-kind interest amount	5,200
2022 Credit Agreement | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Total future maturities	48,200	48,200		$ 48,200
Less: unamortized debt issuance costs	$ (600)	$ (600)
State interest rate (in percent)	8.80%	8.80%		8.30%

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Borrowings - Narrative (Details)				3 Months Ended		12 Months Ended
	Jun. 15, 2023 USD ($) director draw $ / shares	Mar. 31, 2023 USD ($) $ / shares	Feb. 24, 2022 USD ($) segment	Mar. 31, 2023 USD ($) $ / shares	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) $ / shares
Debt Instrument [Line Items]
Principal payments on long-term debt				$ 0	$ 555,048,000
Loss on extinguishment of debt				0	2,809,000
Warrants purchase common stock aggregate stated value			$ 165,000,000
Balance of unamortized issuance costs		$ 10,693,000		$ 10,693,000		$ 11,137,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.0001		$ 0.0001		$ 0.0001
Common Class A
Debt Instrument [Line Items]
Common stock, par value (in dollars per share) | $ / shares		$ 0.0001		$ 0.0001
Series A Preferred
Debt Instrument [Line Items]
Number of directors equity holders can elect | segment			1
Change in voting rights, change in ownership percent			50.10%
Series A Senior Preferred Stock | Forecast
Debt Instrument [Line Items]
Number of additional directors electable by holders | director	3
Number of total directors electable by holders | director	4
Number of unaffiliated directors | director	1
Series B Preferred Stock | Forecast
Debt Instrument [Line Items]
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.0001
2022 Credit Agreement
Debt Instrument [Line Items]
Debt amount			$ 550,000,000
Debt issuance costs, gross			12,500,000
Original issuance discount			10,000,000
Minimum liquidity amount			30,000,000
Prepayment upon insurance proceeds in excess of			$ 15,000,000
2022 Credit Agreement | Forecast
Debt Instrument [Line Items]
Trading days, conversion price adjustment period	5 days
Conversion of convertible notes to common stock	$ 100,000,000
2022 Credit Agreement | Beginning in the second quarter of 2024
Debt Instrument [Line Items]
Maximum debt to EBITDA ratio allowed			7.00
2022 Credit Agreement | In third quarter of 2024
Debt Instrument [Line Items]
Maximum debt to EBITDA ratio allowed			6.75
2022 Credit Agreement | First quarter of 2025
Debt Instrument [Line Items]
Maximum debt to EBITDA ratio allowed			6.25
2022 Credit Agreement | Secured Debt
Debt Instrument [Line Items]
Debt amount			$ 500,000,000
Interest in-kind interest to pay			2.00%
Premium rate		0.50%	0.50%	0.50%
2022 Credit Agreement | Secured Debt | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Floor rate (as a percent)		1.00%
Basis spread on variable rate (as a percent)		7.25%
2022 Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage			0.50%
2022 Credit Agreement | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 50,000,000
Debt issuance costs, gross			500,000
Proceeds from revolving line of credit						$ 48,200,000
Borrowings outstanding		$ 48,200,000		$ 48,200,000
Balance of unamortized issuance costs		$ 600,000		$ 600,000
State interest rate (in percent)		8.80%		8.80%		8.30%
2022 Credit Agreement | Line of Credit | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)		4.10%
2022 Credit Agreement | Line of Credit | Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			10,000,000
Letters of credit outstanding		$ 1,800,000		$ 1,800,000		$ 1,800,000
2016 first lien term loan
Debt Instrument [Line Items]
Principal payments on long-term debt			555,000,000
Loss on extinguishment of debt					$ 2,800,000
First lien credit agreement | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Debt issuance costs, gross			$ 200,000
Balance of unamortized issuance costs						$ 600,000
Transaction Support Agreement | Convertible Debt | Forecast
Debt Instrument [Line Items]
Debt amount	25,000,000
Minimum liquidity amount	$ 20,000,000
Trading days, conversion price adjustment period	10 days
Debt instrument, conversion ratio	0.25
Draw period	18 months
Liquidity period	6 months
Maximum amount of issuable notes	$ 150,000,000
State interest rate (in percent)	8.00%
Transaction Support Agreement | Convertible Debt | Forecast | Two Draws Option
Debt Instrument [Line Items]
Debt amount	$ 12,500,000
Number of draws | draw	2
Transaction Support Agreement | Convertible Debt | Forecast | One Draw Option
Debt Instrument [Line Items]
Debt amount	$ 25,000,000
Number of draws | draw	1

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Borrowings - Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt Disclosure [Abstract]
2023 (remainder of year)	$ 0
2024	0
2025	0
2026	0
2027	48,200
Thereafter	505,217
Total future maturities	553,417
Unamortized original issue discount and debt issuance costs	(19,280)
Total debt, net	$ 534,137	$ 531,600

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Share-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	101,634
Non-cash share-based compensation	$ 1,454	$ 1,960
RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	364
2021 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance ( in shares)	21,300
Increase in number of shares reserved (in shares)	37,000
Common stock, capital shares reserved for future issuance (in shares)	12,000
2021 Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in period (in shares)	36,300
Granted (in usd per share)	$ 0.34
Non-vested awards, cost not yet recognized	$ 16,600
Period of recognition	2 years 7 months 6 days

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Mezzanine and Stockholders' Equity - Narrative (Details)			3 Months Ended		10 Months Ended
	Mar. 31, 2023 USD ($) vote $ / shares shares	Feb. 24, 2022 USD ($) segment $ / shares shares	Mar. 31, 2023 USD ($) vote $ / shares shares	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) $ / shares shares	Jun. 16, 2021 shares	Jun. 15, 2021 shares
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	200,000		200,000		200,000
Exercise price of warrant (in dollars per share) | $ / shares	$ 11.50		$ 11.50
Preferred stock, par value (dollars per share) | $ / shares	0.0001		0.0001		$ 0.0001
Preferred stock, stated value (dollars per share) | $ / shares	$ 1,140.48		$ 1,140.48		$ 1,108.34
Warrants purchase common stock aggregate stated value | $		$ 165,000,000
Preferred stock, shares authorized (in shares)	1,000,000		1,000,000		1,000,000
Preferred stock, shares outstanding (in shares)	200,000		200,000		200,000
Proceeds from issuance of Series A Senior Preferred Stock | $			$ 0	$ 144,667,000
Proceeds from issuance of warrants | $		$ 20,333,000	$ 0	20,333,000
Common stock, shares authorized (in shares)	470,000,000		470,000,000		470,000,000	450,000,000	200,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.0001		$ 0.0001		$ 0.0001
Common stock, shares Issued (in shares)	208,700,000		208,700,000		207,500,000
Common stock, shares outstanding (in shares)	199,500,000		199,500,000		198,400,000
Tax withholdings related to net share settlement of restricted stock awards (in shares)			160,000
Treasury stock (in shares)	240,000		240,000		80,000.00
Treasury Stock, Common, Value | $	$ 197,000		$ 197,000		$ 146,000
Series I Warrants
Class of Stock [Line Items]
Number of outstanding warrants (in shares)		5,200,000
Exercise price of warrant (in dollars per share) | $ / shares		$ 3.00
Proceeds from issuance of warrants | $		$ 5,101,000
Issuance discount | $		$ 200,000
Series II Warrants
Class of Stock [Line Items]
Number of outstanding warrants (in shares)		6,300,000
Exercise price of warrant (in dollars per share) | $ / shares		$ 0.01
Proceeds from issuance of warrants | $		$ 15,232,000
Issuance discount | $		$ 500,000
Series A Preferred
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)	165,000	165,000	165,000		165,000
Preferred stock, par value (dollars per share) | $ / shares		$ 0.0001
Preferred stock, stated value (dollars per share) | $ / shares		$ 1,000
Preferred stock, shares authorized (in shares)		1,000,000
Preferred stock, shares outstanding (in shares)	165,000		165,000		165,000
Proceeds from issuance of Series A Senior Preferred Stock | $		$ 144,667,000
Issuance costs | $		2,880,000
Issuance discount | $		$ 1,447,000
Annual dividend rate		12.00%
Discount on dividends		1.00%
In-kind increasing percentage		1.00%
Dividend rate, occurrence, increase percent		2.00%
Dividends, preferred stock, paid-in-kind | $			$ 5,303,000	$ 1,900,000	$ 17,876,000
Accumulated paid in-kind dividends | $	$ 23,200,000
Redemption value | $	$ 188,179,000	$ 165,000,000	$ 188,179,000		$ 182,876,000
Number of directors equity holders can elect | segment		1
Change in voting rights, ADBITDA threshold | $		$ 100,000,000
Change in voting rights, change in ownership percent		50.10%
Class A Common Stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	470,000,000		470,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.0001		$ 0.0001
Common stock voting rights | vote	1		1
Common stock, shares Issued (in shares)	208,700,000		208,700,000
Common stock, shares outstanding (in shares)	199,500,000		199,500,000
Class A Common Stock | Series I Warrants
Class of Stock [Line Items]
Exercise period		5 years
Class A Common Stock | Series II Warrants
Class of Stock [Line Items]
Exercise period		5 years

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Mezzanine and Stockholders' Equity - Components of Proceeds Related to the Series A Senior Preferred Stock (Details) - USD ($) $ in Thousands		3 Months Ended
	Feb. 24, 2022	Mar. 31, 2023	Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Gross proceeds allocated to Series A Senior Preferred Stock		$ 0	$ 144,667
Series A Preferred
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Gross proceeds allocated to Series A Senior Preferred Stock	$ 144,667
Less: original issue discount	(1,447)
Less: issuance costs	(2,880)
Net proceeds received from issuance of Series A Senior Preferred Stock	$ 140,340

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Mezzanine and Stockholders' Equity - Aggregate Stated Value Of Series A Senior Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		10 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Feb. 24, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Preferred stock, shares issued (in shares)	200,000		200,000
Preferred stock, shares outstanding (in shares)	200,000		200,000
Stated value (dollars per share)	$ 1,140.48		$ 1,108.34
Series A Preferred
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Aggregate stated value, beginning	$ 182,876		$ 165,000
Dividends, preferred stock, paid-in-kind	5,303	$ 1,900	17,876
Aggregate stated value, ending	$ 188,179		$ 182,876
Preferred stock, shares issued (in shares)	165,000		165,000	165,000
Preferred stock, shares outstanding (in shares)	165,000		165,000
Stated value (dollars per share)				$ 1,000

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Mezzanine and Stockholders' Equity - Components of Proceeds Related to the Warrants (Details) - USD ($) $ in Thousands		3 Months Ended
	Feb. 24, 2022	Mar. 31, 2023	Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Gross proceeds allocated to 2022 Warrants	$ 20,333	$ 0	$ 20,333
Less: original issue discount	(203)
Less: issuance costs	(405)
Net proceeds received from issuance of 2022 Warrants	19,725		$ 19,725
Series I Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Gross proceeds allocated to 2022 Warrants	5,101
Less: original issue discount	(51)
Less: issuance costs	(102)
Net proceeds received from issuance of 2022 Warrants	4,948
Series II Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Gross proceeds allocated to 2022 Warrants	15,232
Less: original issue discount	(152)
Less: issuance costs	(303)
Net proceeds received from issuance of 2022 Warrants	$ 14,777

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Mezzanine and Stockholders' Equity - Reserved Shares (Details) shares in Thousands	Mar. 31, 2023 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	101,634
Shares available for grant under the 2021 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	12,041
Earnout Shares reserved
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	15,000
2022 Warrants outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	11,498
IPO Warrants outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	9,867
Vesting Shares reserved
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	8,625
Restricted shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	364
2021 Plan | Shares available for grant under the 2021 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (in shares)	44,239

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IPO Warrant Liability - Narrative (Details) shares in Millions	Mar. 31, 2023 $ / shares shares
Class of Warrant or Right [Line Items]
Exercise price of warrant (in dollars per share) | $ / shares	$ 11.50
Public Warrant
Class of Warrant or Right [Line Items]
Number of shares called by each warrant	6.9
Private Placement Warrant
Class of Warrant or Right [Line Items]
Number of shares called by each warrant	3.0

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IPO Warrant Liability - Warrant Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	$ 98
Increase (decrease) in fair value	198	$ (1,677)
Fair value, end of period	296
Private Placement Warrant
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	29	1,305
Increase (decrease) in fair value	60	(504)
Fair value, end of period	89	801
Public Warrant
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	69	3,036
Increase (decrease) in fair value	138	(1,173)
Fair value, end of period	$ 207	$ 1,863

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Contingent Common Shares Liability - Narrative (Details)	Jun. 16, 2021 tranche $ / shares shares
Earnout Shares
Derivative [Line Items]
Contingent consideration liability (in shares)	15,000,000
Number of tranches | tranche	3
First Issuance, Earnout Shares
Derivative [Line Items]
Contingent consideration liability (in shares)	5,000,000
First Issuance, Earnout Shares | Weighted Average
Derivative [Line Items]
Stock price trigger (in dollars per share) | $ / shares	$ 12.00
Second Issuance, Earnout Shares
Derivative [Line Items]
Contingent consideration liability (in shares)	5,000,000
Second Issuance, Earnout Shares | Weighted Average
Derivative [Line Items]
Stock price trigger (in dollars per share) | $ / shares	$ 14.00
Third Issuance, Earnout Shares
Derivative [Line Items]
Contingent consideration liability (in shares)	5,000,000
Third Issuance, Earnout Shares | Weighted Average
Derivative [Line Items]
Stock price trigger (in dollars per share) | $ / shares	$ 16.00
Vesting Shares
Derivative [Line Items]
Contingent consideration liability (in shares)	8,600,000
Number of tranches | tranche	3
First Issuance, Vesting Shares
Derivative [Line Items]
Contingent consideration liability (in shares)	2,900,000
First Issuance, Vesting Shares | Weighted Average
Derivative [Line Items]
Stock price trigger (in dollars per share) | $ / shares	$ 12.00
Second Issuance, Vesting Shares
Derivative [Line Items]
Contingent consideration liability (in shares)	2,900,000
Second Issuance, Vesting Shares | Weighted Average
Derivative [Line Items]
Stock price trigger (in dollars per share) | $ / shares	$ 14.00
Third Issuance, Vesting Shares
Derivative [Line Items]
Contingent consideration liability (in shares)	2,900,000
Third Issuance, Vesting Shares | Weighted Average
Derivative [Line Items]
Stock price trigger (in dollars per share) | $ / shares	$ 16.00

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Contingent Common Shares Liability - Derivatives and Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Schedule of Changes in Fair Value
Fair value, beginning of period	$ 2,835
Fair value, end of period	2,126
Earnout Shares
Schedule of Changes in Fair Value
Fair value, beginning of period	1,800	$ 28,800
Decrease in fair value	(450)	(15,450)
Fair value, end of period	1,350	13,350
Vesting Shares
Schedule of Changes in Fair Value
Fair value, beginning of period	1,035	16,560
Decrease in fair value	(259)	(8,884)
Fair value, end of period	$ 776	$ 7,676

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Fair Value Measurements - Narrative (Details) $ in Millions	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Fair Value, Inputs, Level 3 | Dividend yield
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Vesting Shares	0	0
Earnout Shares	0	0
Money Market Funds | Fair Value, Inputs, Level 1
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Cash and cash equivalent, fair value disclosure	$ 0.0	$ 30.0

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Fair Value Measurements - Measurement Inputs (Details) - Fair Value, Inputs, Level 3	Mar. 31, 2023 $ / shares	Dec. 31, 2022 $ / shares
Risk-free interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earnout Shares	0.0349	0.0388
Vesting Shares	0.0349	0.0388
Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earnout Shares	0.7730	0.7460
Vesting Shares	0.7730	0.7460
Dividend yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earnout Shares	0	0
Vesting Shares	0	0
Expected term (years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earnout Share, Term	8 years 2 months 12 days	8 years 6 months
Vesting Shares, Term	8 years 2 months 12 days	8 years 6 months
Share price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Earnout Shares	0.25	0.31
Vesting Shares	0.25	0.31

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Fair Value Measurements - Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash Flow Hedges
Beginning balance	$ 48,447	$ 511,507
Unrealized gain (loss) recognized in other comprehensive income before reclassifications	(99)	3,681
Reclassification to interest expense, net	(3,357)	71
Ending balance	20,474	398,226
Cash Flow Hedges
Cash Flow Hedges
Beginning balance	4,899	28
Ending balance	$ 1,443	$ 3,780

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Fair Value Measurements - Schedule of Fair Value of Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Other current assets
Derivatives designated as cash flow hedging instruments:
Assets	$ 1,708	$ 5,028
Other non-current assets
Derivatives designated as cash flow hedging instruments:
Assets	0	0
Accrued expenses and other liabilities
Derivatives designated as cash flow hedging instruments:
Liabilities	0	0
Other non-current liabilities
Derivatives designated as cash flow hedging instruments:
Liabilities	$ 237	$ 73

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Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Effect income tax rate (in percent)	(0.20%)	14.40%
Income tax expense (benefit)	$ 62	$ (23,281)

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Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Lessee, Lease, Description [Line Items]
Operating lease assets additions	$ 5.9	$ 5.7
Operating lease liabilities, additions	$ 5.9	$ 5.7
Minimum
Lessee, Lease, Description [Line Items]
Initial operating lease term	7 years
Maximum
Lessee, Lease, Description [Line Items]
Initial operating lease term	10 years

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Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Leases [Abstract]
Operating lease cost	$ 16,689	$ 16,703
Variable lease cost	5,362	5,205
Total lease cost	$ 22,051	$ 21,908

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Leases - Supplemental Cash Flow (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 13,133	$ 16,438
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 4,898	$ 5,142

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Leases - Other Information (Details)	Mar. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Weighted-average remaining lease term: Operating leases	5 years 9 months 18 days	5 years 10 months 24 days
Weighted-average discount rate: Operating leases	710.00%	690.00%

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Leases - Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
2023 (remainder of year)	$ 51,578
2024	64,446
2025	54,923
2026	48,378
2027	37,201
Thereafter	73,641
Total undiscounted future cash flows	330,167
Less: Imputed Interest	(61,860)
Present value of future cash flows	268,307
Presentation on Balance Sheet:
Current	51,911	$ 47,676
Non-current	216,396	218,424
Disposal Group, Held-for-sale, Not Discontinued Operations | 2022 Clinics Held for Sale
Presentation on Balance Sheet:
Current portion of operating lease liabilities	376	685
Operating lease liabilities	$ 1,039	$ 1,706

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Commitments and Contingencies (Details) $ in Millions		10 Months Ended
	Aug. 16, 2021 plaintiff	Sep. 22, 2022 plaintiff	Mar. 31, 2023 USD ($) shares	Dec. 31, 2022 shares	Nov. 21, 2022 segment	Jun. 16, 2021 shares	Jun. 15, 2021 shares
Loss Contingencies [Line Items]
Contractual obligation | $			$ 15.2
Common stock, shares authorized (in shares) | shares			470,000,000	470,000,000		450,000,000	200,000,000
Number of plaintiffs who filed consolidated amended complaint | segment					4
ATI Shareholders vs ATI Individual Defendants
Loss Contingencies [Line Items]
Number of plaintiffs	2
Derivative Action
Loss Contingencies [Line Items]
Number of plaintiffs		5
Claims filed		4

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Loss per Share - Loss per Share Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Basic and diluted loss per share:
Net loss	$ (25,210)	$ (138,223)
Less: Net income (loss) attributable to non-controlling interests	1,060	(473)
Less: Series A Senior Preferred cumulative dividend	5,303	1,925
Loss available to common stockholders, basic	(31,573)	(139,675)
Loss available to common stockholders, diluted	$ (31,573)	$ (139,675)
Weighted average shares outstanding, basic (in shares)	204,921	199,971
Weighted average shares outstanding, diluted (in shares)	204,921	199,971
Basic loss per share (in dollars per share)	$ (0.15)	$ (0.70)
Diluted loss per share (in dollars per share)	$ (0.15)	$ (0.70)

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Loss per Share - Antidilutive Securities (Details) - shares		3 Months Ended
	Jun. 16, 2021	Mar. 31, 2023	Mar. 31, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities (in shares)		59,696,000	27,544,000
Earnout Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Contingent consideration liability (in shares)	15,000,000
Vesting Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Contingent consideration liability (in shares)	8,600,000
Series I Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities (in shares)		5,226,000	5,226,000
IPO Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities (in shares)		9,867,000	9,867,000
Restricted shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities (in shares)		144,000	366,000
Restricted shares | Wilco Holdco, Inc.
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities (in shares)		364,000	1,248,000
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities (in shares)		5,003,000	5,951,000
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total antidilutive securities (in shares)		39,092,000	4,886,000