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Debt
 12 Months Ended
Dec. 29, 2024
Debt Disclosure [Abstract]  
Debt Debt
Debt at December 29, 2024 and December 31, 2023 was as follows:
Fiscal Year
(In millions)20242023
ATI Inc. 7.25% Notes due 2030
$425.0 $425.0 
ATI Inc. 5.875% Senior Notes due 2027
350.0 350.0 
ATI Inc. 5.125% Senior Notes due 2031
350.0 350.0 
ATI Inc. 4.875% Notes due 2029
325.0 325.0 
ATI Inc. 3.5% Convertible Senior Notes due 2025
— 291.4 
Allegheny Ludlum 6.95% Debentures due 2025 (a)
150.0 150.0 
ABL Term Loan 200.0 200.0 
U.S. revolving credit facility— — 
Foreign credit agreements— 5.0 
Finance leases and other109.5 102.8 
Debt issuance costs(14.2)(19.6)
Total short-term and long-term debt1,895.3 2,179.6 
Short-term debt and current portion of long-term debt180.4 31.9 
Total long-term debt$1,714.9 $2,147.7 
(a)The payment obligations of these debentures issued by Allegheny Ludlum, LLC are fully and unconditionally guaranteed by ATI.
Interest expense was $124.2 million in fiscal year 2024, $105.8 million in fiscal year 2023, and $92.1 million in fiscal year 2022. Interest expense was reduced by $11.8 million, $13.5 million, and $5.1 million, in fiscal years 2024, 2023, and 2022, respectively, from interest capitalization on capital projects. Interest and commitment fees paid were $131.4 million in fiscal year 2024, $114.7 million in fiscal year 2023, and $92.8 million in fiscal year 2022. Net interest expense includes interest income of $16.0 million in fiscal year 2024, $13.0 million in fiscal year 2023, and $4.7 million in fiscal year 2022.

Scheduled principal payments during the next five fiscal years are $180.5 million in 2025, $25.0 million in 2026, $572.2 million in 2027, $16.7 million in 2028, and $335.8 million in 2029. See Note 11, Leases, for the portion of these scheduled principal payments that are related to finance leases.
2030 Notes
In August 2023, ATI issued $425 million aggregate principal amount of 7.25% Senior Notes due 2030 (2030 Notes). Interest on the 2030 Notes is payable semi-annually in arrears at a rate of 7.25% per year. The 2030 Notes will mature on August 15, 2030. Net proceeds were $418.8 million from this issuance, of which $222 million was used to fund ATI’s U.S. qualified defined benefit pension plan in order to facilitate a pension derisking strategy (see Note 14), and the remaining proceeds were
used for liquidity and general corporate purposes. Underwriting fees and other third-party expenses for the issuance of the 2030 Notes were $6.2 million, and are being amortized to interest expense over the 7-year term of the 2030 Notes. The 2030 Notes are unsecured and unsubordinated obligations of the Company and equally ranked with all of its existing and future senior unsecured debt. The 2030 Notes restrict the Company’s ability to create certain liens, to enter into sale leaseback transactions, guarantee indebtedness and to consolidate or merge all, or substantially all, of its assets. The Company has the option to redeem the 2030 Notes, as a whole or in part, at any time or from time to time, on at least 15 days, but not more than 60 days, prior notice to the holders of the Notes at redemption prices specified in the 2030 Notes. The 2030 Notes are subject to repurchase upon the occurrence of a change in control repurchase event (as defined in the 2030 Notes) at a repurchase price in cash equal to 101% of the aggregate principal amount of the Notes repurchased, plus any accrued and unpaid interest on the 2030 Notes repurchased.
2025 Convertible Notes
During the third quarter of 2024, the Company notified holders of the $291.4 million outstanding principal amount of its 3.5% Convertible Notes due 2025 (2025 Convertible Notes) that they would be redeemed prior to their maturity date. The holders of any outstanding 2025 Convertible Notes had the right to convert the principal amount of such notes into shares of ATI’s common stock prior to the redemption date. Any 2025 Convertible Notes not tendered for conversion prior to the redemption date were redeemed in cash at a redemption price equal to the principal amount, plus accrued and unpaid interest.
As a result, $291.0 million principal amount of the outstanding notes was converted at a rate of 64.7178 shares of ATI common stock per $1,000 principal amount, equivalent to a conversion price of $15.45 per share or 18.8 million shares of ATI common stock. Due to the early redemption of the 2025 Convertible Notes, the conversion rate was a premium to the conversion rate of 64.5745 shares of ATI common stock per $1,000 principal amount, or approximately $15.49 per share, that would have been due at maturity. The remaining $0.4 million of outstanding principal balance were not tendered for conversion and, as a result, the Company redeemed those for cash.
For those holders who exercised the conversion rights, the terms of the 2025 Convertible Notes provided that any accrued but unpaid interest at the date of conversion was forfeited. As a result, accrued interest from the last interest payment date of June 15, 2024 through the date of conversion, totaling $2.3 million, was credited to additional paid-in capital. In addition, the remaining unamortized deferred issuance costs of $1.6 million at the date of conversion were charged to additional paid-in capital.
Coincident with its redemption of the 2025 Convertible Notes, the Company also settled the capped call transactions initiated as part of the issuance of the 2025 Convertible Notes. The capped call transactions included a cap price of $19.76 per share and were settled for $76.1 million in cash, which is recorded as additional paid-in capital on the consolidated balance sheet and as a financing activity on the consolidated statement of cash flows.
As of December 31, 2023, the fair value of the 2025 Convertible Notes was $864 million based on the quoted market price, which is classified in Level 1 of the fair value hierarchy. The 2025 Convertible Notes had a 3.5% cash coupon rate that was payable semi-annually in arrears on each June 15 and December 15. Including amortization of deferred issuance costs, the effective interest rate up to the time of conversion was 4.2% for the fiscal years ended December 29, 2024, December 31, 2023 and January 1, 2023. Remaining deferred issuance costs were $2.9 million at December 31, 2023. Interest expense on the 2025 Convertible Notes was as follows:
Fiscal Year
(in millions)202420232022
Contractual coupon rate$7.2 $10.2 $10.2 
Amortization of debt issuance costs1.3 1.9 1.8 
   Total interest expense$8.5 $12.1 $12.0 
2022 Convertible Notes
In fiscal year 2022, $82.5 million of the 2022 Convertible Senior Notes were converted into 5.7 million shares of ATI common stock, with the remaining $1.7 million of outstanding principal balance paid in cash for notes that were not converted at the July 1, 2022 maturity date. The conversion rate for the 2022 Convertible Notes was 69.2042 shares of ATI common stock per $1,000 principal amount of the 2022 Convertible Notes, equivalent to a conversion price of $14.45 per share.
Interest on the 2022 Convertible Notes at the 4.75% cash coupon rate was payable semi-annually in arrears on each January 1 and July 1. Including amortization of deferred issuance costs, the effective interest rate was 5.4% for the fiscal year ended January 1, 2023. Interest expense on the 2022 Convertible Notes was as follows:
Fiscal Year
(in millions)2022
Contractual coupon rate$2.0 
Amortization of debt issuance costs0.3 
   Total interest expense$2.3 
Credit Agreements
The Company has an Asset Based Lending (ABL) credit facility, which is collateralized by the accounts receivable and inventory of the Company’s operations. The ABL credit facility also provides the Company with the option of including certain machinery and equipment as additional collateral for purposes of determining availability under the facility. The ABL credit facility, which matures in September 2027, includes a $600 million revolving credit facility, a letter of credit sub-facility of up to $200 million, a $200 million term loan (ABL Term Loan), and a swing loan facility of up to $60 million. The ABL Term Loan has an interest rate of 2.0% above adjusted Secured Overnight Financing Rate (SOFR) and can be prepaid in increments of $25 million if certain minimum liquidity conditions are satisfied. In addition, the Company has the right to request an increase of up to $300 million under the revolving credit facility for the duration of the ABL. The Company previously maintained a $50 million floating-for-fixed interest rate swap which converted a portion of the ABL Term Loan to a 4.21% fixed interest rate that matured in June 2024.

The applicable interest rate for revolving credit borrowings under the ABL credit facility includes interest rate spreads based on available borrowing capacity that range between 1.25% and 1.75% for SOFR-based borrowings and between 0.25% and 0.75% for base rate borrowings. The ABL credit facility contains a financial covenant whereby the Company must maintain a fixed charge coverage ratio of not less than 1.00:1.00 after an event of default has occurred and is continuing or if the undrawn availability under the ABL revolving credit portion of the facility is less than the greater of (i) 10% of the then applicable maximum loan amount under the revolving credit portion of the ABL and the outstanding ABL Term Loan balance, or (ii) $60.0 million. The Company was in compliance with the fixed charge coverage ratio as of December 29, 2024. Additionally, the Company must demonstrate minimum liquidity specified by the facility during the 90-day period immediately preceding the stated maturity date of its 6.95% Debentures due 2025 issued by the Company’s wholly owned subsidiary, Allegheny Ludlum LLC. The ABL also contains customary affirmative and negative covenants for credit facilities of this type, including limitations on the Company’s ability to incur additional indebtedness or liens or to enter into investments, mergers and acquisitions, dispositions of assets and transactions with affiliates, some of which are more restrictive, at any time during the term of the ABL when the Company’s fixed charge coverage ratio is less than 1.00:1.00 and its undrawn availability under the revolving portion of the ABL is less than the greater of (a) $120 million or (b) 20% of the sum of the maximum loan amount under the revolving credit portion of the ABL and the outstanding ABL Term Loan balance. On September 9, 2022, the Company amended and restated the ABL and costs associated with entering into this amendment were $2.4 million, and are being amortized to interest expense over the term of the facility ending September 2027, along with $1.7 million of unamortized deferred costs previously recorded for the ABL.
As of December 29, 2024, there were no outstanding borrowings under the revolving portion of the ABL, and $30.5 million was utilized to support the issuance of letters of credit. There were no revolving credit borrowings under the ABL during fiscal year 2024. There were average revolving credit borrowings of $13 million bearing an average annual interest rate of 6.5% under the ABL during fiscal year 2023. The Company also has foreign credit facilities, primarily in China, that total $70 million based on December 29, 2024 foreign exchange rates, none of which was drawn as of December 29, 2024 and $5.0 million of which was drawn as of December 31, 2023.
The Company has no off-balance sheet financing relationships as defined in Item 303(a)(4) of SEC Regulation S-K, with variable interest entities, structured finance entities, or any other unconsolidated entities. At December 29, 2024, the Company had not guaranteed any third-party indebtedness.