10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark one)

xQuarterly report pursuant to Section 13 or 15 (d) of the Securities Exchange Act of 1934

For the quarterly period ended July 4, 2015

Or

oTransition report pursuant to Section 13 or 15 (d) of the Securities Exchange Act of 1934

For the transition period from             to              

COMMISSION FILE NUMBER: 000-49798

THORATEC CORPORATION

(Exact name of registrant as specified in its charter)

California	94-2340464
(State or other jurisdiction of incorporation	(I.R.S. Employer Identification No.)
or organization)
6035 Stoneridge Drive, Pleasanton, California	94588
(Address of principal executive offices)	(Zip Code)

(925) 847-8600

(Registrant’s telephone number, including area code)

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 x No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes x No o

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

Large accelerated filer x	Accelerated filer o
Non-accelerated filer o	Smaller reporting company o
(Do not check if smaller reporting company)

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

As of July 31, 2015, the registrant had 54.8 million shares of common stock outstanding.

THORATEC CORPORATION

TABLE OF CONTENTS

Part I. Financial Information	3
Item 1. Unaudited Condensed Consolidated Financial Statements	3
Condensed Consolidated Balance Sheets as of July 4, 2015 and January 3, 2015	3
Condensed Consolidated Statements of Operations for the Three and Six Months Ended July 4, 2015 and June 28, 2014	4
Condensed Consolidated Statements of Comprehensive Income for the Three and Six Months Ended July 4, 2015 and June 28, 2014	5
Condensed Consolidated Statements of Cash Flows for the Six Months Ended July 4, 2015 and June 28, 2014	6
Notes to Unaudited Condensed Consolidated Financial Statements	7
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	22
Item 3. Quantitative and Qualitative Disclosures About Market Risk	28
Item 4. Controls and Procedures	29
Part II. Other Information	30
Item 1. Legal Proceedings	30
Item 1A. Risk Factors	30
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	32
Item 6. Exhibits	32
Signatures	33
Exhibits
EX-31.1
EX-31.2
EX-32.1
EX-32.2
EX-101 INSTANCE DOCUMENT
EX-101 SCHEMA DOCUMENT
EX-101 CALCULATION LINKBASE DOCUMENT
EX-101 DEFINITION LINKBASE DOCUMENT
EX-101 LABELS LINKBASE DOCUMENT
EX-101 PRESENTATION LINKBASE DOCUMENT

PART I. FINANCIAL INFORMATION

ITEM 1. UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

THORATEC CORPORATION

CONDENSED CONSOLIDATED BALANCE SHEETS

(unaudited)

(in thousands)

	July 4, 2015			January 3, 2015
ASSETS
Current assets:
Cash and cash equivalents	$	144,925		$	72,814
Short-term available-for-sale investments	129,042			157,664
Receivables, net of allowances of $1,892 in 2015 and $1,504 in 2014	79,915			72,847
Inventories	70,859			62,204
Deferred tax assets	15,782			15,727
Income tax receivable	14,476			10,778
Prepaid expenses and other assets	5,922			12,458
Total current assets	460,921			404,492
Property, plant and equipment, net	49,371			51,231
Goodwill	226,578			225,293
Purchased intangible assets, net	40,313			44,488
Long-term available-for-sale investments	4,212			4,239
Other long-term assets	35,787			34,240
Total Assets	$	817,182		$	763,983
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	20,969		$	12,662
Accrued compensation	25,472			22,836
Warranty and related accrual	8,648			10,639
Contingent liabilities, current portion	5,782			14,902
Other accrued liabilities	22,391			20,441
Total current liabilities	83,262			81,480
Long-term deferred tax liability	4,376			3,592
Other long-term liabilities	17,079			14,458
Contingent liabilities, non-current portion (Note 2)	32,237			31,656
Total Liabilities	136,954			131,186
Shareholders’ equity:
Common shares: no par, authorized 100,000; issued and outstanding 54,741 in 2015 and 54,109 in 2014	—			—
Additional paid-in capital	652,793			614,577
Retained earnings	45,335			40,242
Accumulated other comprehensive loss:	(17,900		)	(22,022		)
Total Shareholders’ Equity	680,228			632,797
Total Liabilities and Shareholders’ Equity	$	817,182		$	763,983

See notes to the unaudited condensed consolidated financial statements.

3

THORATEC CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(unaudited)

(in thousands, except per share data)

	Three Months Ended						Six Months Ended
	July 4, 2015			June 28, 2014			July 4, 2015			June 28, 2014
Product sales	$	128,692		$	118,063		$	250,000		$	243,760
Cost of product sales	39,897			34,307			77,026			74,333
Gross profit	88,795			83,756			172,974			169,427
Operating expenses:
Selling, general and administrative	43,932			35,477			84,049			70,978
Research and development	26,511			23,048			52,628			46,387
Total operating expenses	70,443			58,525			136,677			117,365
Income from operations	18,352			25,231			36,297			52,062
Other income and (expense):
Interest expense	(13		)	(2		)	(13		)	(2		)
Interest income and other	687			559			1,504			806
Income before income taxes	19,026			25,788			37,788			52,866
Income tax expense	(5,778		)	(8,375		)	(13,760		)	(17,214		)
Net income	$	13,248		$	17,413		$	24,028		$	35,652
Net Income per share:
Basic	$	0.24		$	0.31		$	0.44		$	0.63
Diluted	$	0.24		$	0.30		$	0.44		$	0.62
Shares used to compute income per share:
Basic	54,481			56,723			54,246			56,781
Diluted	55,261			57,188			55,155			57,538

See notes to the unaudited condensed consolidated financial statements.

4

THORATEC CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(unaudited)

(in thousands)

	Three Months Ended						Six Months Ended
	July 4, 2015			June 28, 2014			July 4, 2015			June 28, 2014
Net income	$	13,248		$	17,413		$	24,028		$	35,652
Unrealized gains (losses) on investments (net of taxes (benefits) of $(188) and $(2) for the three months ended July 4, 2015 and June 28, 2014, respectively, and $(183) and $(284) for the six months ended July 4, 2015 and June 28, 2014, respectively)	(282		)	4			(274		)	(1,407		)
Foreign currency translation adjustments	1,667			(781		)	4,396			678
Total other comprehensive income (loss)	1,385			(777		)	4,122			(729		)
Comprehensive income	$	14,633		$	16,636		$	28,150		$	34,923

See notes to the unaudited condensed consolidated financial statements.

5

THORATEC CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(unaudited)

(in thousands)

	Six Months Ended
	July 4, 2015			June 28, 2014
Cash flows from operating activities:
Net Income	$	24,028		$	35,652
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,943			8,207
Fixed assets write-down	172			—
Investment premium amortization, net	1,810			2,176
Allowance (reduction in) for bad debt	463			(995		)
Foreign currency re-measurement and other	5,149			232
Tax benefit related to stock options	992			875
Change in fair value of contingent consideration	818			(1,436		)
Share-based compensation expense	18,850			14,615
Excess tax benefits from share-based compensation	(1,941		)	(989		)
Loss on disposal of assets	96			613
Change in net deferred tax liability	(428		)	(226		)
Changes in assets and liabilities:
Receivables	(8,858		)	3,697
Inventories	(9,958		)	(8,104		)
Other current and non-current assets	3,136			559
Accounts payable	8,771			1,167
Income taxes, net	(11		)	(7,410		)
Other current and non-current liabilities	5,692			(7,799		)
Net cash provided by operating activities	55,724			40,834
Cash flows from investing activities:
Purchases of available-for-sale investments	(90,937		)	(86,877		)
Sales and maturities of available-for-sale investments	116,891			94,232
Purchases of property, plant and equipment	(2,820		)	(5,330		)
Note receivable from Apica	—			(2,019		)
Net cash provided by investing activities	23,134			6
Cash flows from financing activities:
Payment of contingent consideration	(7,699		)	(6,107		)
Proceeds from stock option exercises	23,463			2,867
Proceeds from stock issued under employee stock purchase plan	2,499			2,800
Excess tax benefits from share-based compensation	1,941			989
Repurchase and retirement of common shares	(32,268		)	(46,030		)
Net cash used in financing activities	(12,064		)	(45,481		)
Effect of exchange rate changes on cash and cash equivalents	5,317			271
Net increase (decrease) in cash and cash equivalents	72,111			(4,370		)
Net cash and cash equivalents at beginning of period	72,814			139,099
Net cash and cash equivalents at end of period	$	144,925		$	134,729
Supplemental disclosure of consolidated cash flow information:
Cash paid for taxes	$	13,239		$	24,206
Supplemental disclosure of consolidated non-cash investing and financing activities:
Transfers of equipment from inventory	$	605		$	1,012
Repurchases and retirement of common shares through other accrued liabilities	$	312		$	2,266
Purchases of property, plant and equipment through accounts payable and accrued liabilities	$	221		$	583

See notes to the unaudited condensed consolidated financial statements.

6

THORATEC CORPORATION

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Note 1. Operations and Significant Accounting Policies

Basis of Presentation

The interim unaudited condensed consolidated financial statements of Thoratec Corporation (“we,” “our,” “us,” or the “Company”) have been prepared and presented in accordance with accounting principles generally accepted in the U.S. (“GAAP”) and the rules and regulations of the Securities and Exchange Commission (“SEC”), without audit, and reflect all adjustments necessary (consisting only of normal recurring adjustments) to present fairly our financial position, results of operations and cash flows as of and for the periods presented. Certain information and footnote disclosures normally included in our annual financial statements, prepared in accordance with GAAP, have been condensed or omitted. The accompanying financial statements should be read in conjunction with our consolidated financial statements, and the accompanying notes thereto, filed with the SEC in our Annual Report on Form 10-K for the fiscal year ended January 3, 2015 (the “2014 Annual Report”). The operating results for any interim period are not necessarily indicative of the results that may be expected for any future period.

The preparation of our unaudited condensed consolidated financial statements necessarily requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities on the unaudited condensed consolidated balance sheet dates and the reported amounts of revenues and expenses for the periods presented. Significant items subject to management’s estimates include revenue recognition, the useful lives of property and equipment, allowance for doubtful accounts, valuation allowance for deferred tax assets, stock-based compensation, income tax uncertainties, valuation of goodwill and intangible assets, warranty accrual and contingent consideration. The actual amounts could differ from those estimated amounts.

Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606), which provides guidance for revenue recognition. This ASU affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of non-financial assets. The guidance in this ASU supersedes the revenue recognition requirements in Topic 605, Revenue Recognition, and most industry-specific guidance. This ASU also supersedes some cost guidance included in Subtopic 605-35, Revenue Recognition-Construction-Type and Production-Type Contracts. On July 9, 2015, FASB voted to defer the effective date of this standard by one year to December 15, 2017. This standard will be effective for the Company starting in the fiscal year 2018. We are currently evaluating the impact of the adoption of this ASU on our condensed consolidated financial statements.

In February 2015, the FASB issued ASU No. 2015-02, Amendments to the Consolidation Analysis. The new standard amends the guidelines for determining whether certain legal entities should be consolidated and reduces the number of consolidation models. The new standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. We are currently evaluating the impact, if any, of adopting this new accounting guidance on our condensed consolidated financial statements.

In July 2015, the FASB issued ASU No. 2015-11, Simplifying the Measurement of Inventory. The new standard amends the guidelines for the measurement of inventory from lower of cost or market to the lower of cost and net realizable value (NRV). NRV is defined as the estimated selling prices in the ordinary course of business less reasonably predictable costs of completion, disposal, and transportation. Under existing standards, inventory is measured at lower of cost or market, which requires the consideration of replacement cost, NRV, and NRV less an amount that approximates a normal profit margin. This ASU eliminates the requirement to determine and consider replacement cost or NRV less an approximately normal profit margin for inventory measurement. The new standard is effective prospectively beginning January 1, 2017, with early adoption permitted. We are currently evaluating the impact, if any, of adopting this new accounting guidance on our condensed consolidated financial statements.

Note 2. Acquisitions

We have accounted for our acquisitions as business combinations. In accordance with authoritative guidance on business combination accounting, the assets and liabilities of the acquired companies were recorded as of the acquisition date, at their respective fair values, and are consolidated within our condensed consolidated financial statements. The results of operations related to each company acquired have been included in our condensed consolidated statements of operations since the date each company was acquired. All acquisition-related costs are expensed and recorded in selling, general and administrative expenses in our condensed consolidated statement of operations for the periods presented.

7

Apica Acquisition in 2014

On July 2, 2014, we acquired all of the outstanding equity interests of Apica Cardiovascular Limited (“Apica”) and certain related subsidiaries from the former stockholders of Apica (the “Apica Acquisition”). Under the terms of the Apica Acquisition, the initial purchase consideration was approximately $35.1 million (net of acquired cash and inclusive of the settlement of existing debt and Apica’s direct acquisition-related transaction costs), and we will be obligated to make potential future milestone payments, based on regulatory approvals and commercial sales, of up to $40.0 million. Total purchase price allocation was estimated at $60.8 million at the acquisition date, including the initial purchase consideration of approximately $35.1 million and the estimated fair values for contingent consideration totaling $25.7 million, which was recorded as a non-current liability because such contingent consideration is expected to be settled no earlier than the third quarter of 2016. Prior to the acquisition, Apica was developing a surgical implantation system (“SIS”) to improve the apical access and attachment of the Left Ventricular Assist Device (“LVAD”) to the apex of the heart. We plan to couple the SIS with our HeartMate product line with the intention to obtain regional regulatory approvals for commercialization. In addition, Apica had developed the apical access, stabilization, and closure (“ASC”) device, which is commercially sold in Europe and is used for transapical valve procedures. We incurred $2.3 million of acquisition-related costs in connection with the Apica Acquisition in 2014.

The purchase price allocation as of the acquisition date (as adjusted) is summarized as follows (in thousands):

Current assets (excluding cash)	$	548
Identifiable intangible assets:
Developed technology (ASC)	5,300
IPR&D asset (SIS)	26,500
Goodwill	31,491
Total assets	63,839
Less: Liabilities assumed	463
Deferred tax liability	2,562
Total estimated purchase price consideration	60,814
Less: Contingent consideration	25,700
Cash paid or payable at the acquisition closing	$	35,114

We recorded an IPR&D asset of $26.5 million, which represents an estimate of the fair value of the in-process technology related to the SIS device. The fair value of the IPR&D asset was determined using the multi-period excess earnings method which is equal to the present value of the incremental after-tax cash flows attributable to that intangible asset, using a discount rate of 23% based on our best estimate of a market participant’s after-tax weighted average cost of capital. We also recorded an ASC intangible asset of $5.3 million, which represents the estimated fair value of the technology associated with the ASC device. The fair value of the ASC intangible asset was determined using the replacement cost method, which represents what a market participant’s estimated cost would be to obtain or develop the technology in its current state. The replacement cost method was utilized because of limited market opportunities associated with the ASC technology. In the fourth quarter of 2014, we discontinued the commercialization of the ASC device and impaired the unamortized net book value associated with the ASC intangible asset.

Goodwill is calculated as the difference between the acquisition date fair value of the consideration transferred and the fair values assigned to the assets acquired, liabilities assumed, and primarily represents the expected synergies of Apica with our technologies. The goodwill of $31.5 million was allocated to our sole operating segment (Cardiovascular group) and is not deductible for income tax purposes.

The following pro forma information presents the combined results of operations for the six months ended June 28, 2014 as if we had completed the Apica acquisition at the beginning of 2013. The pro forma financial information is provided for comparative purposes only and is not necessarily indicative of what actual results would have been had the acquisition occurred on the date indicated, nor does it give effect to synergies, cost savings, fair market value adjustments, immaterial depreciation expense and other changes expected to result from the acquisition. Accordingly, the pro forma financial results do not purport to be indicative of condensed consolidated results of operations as of the date hereof, for any period ended on the date hereof, or for any other future date or period.

	Six months Ended June 28, 2014
Product sales	$	243,760
Income before taxes	49,793
Net income	33,579

8

Contingent Consideration

Our acquisition of Apica includes payments of future contingent consideration upon the achievement of certain regulatory approvals and commercial sales milestones. We determined the initial fair value of the contingent consideration in connection with the regulatory and commercial sales milestones using various estimates, including probabilities of success, discount rates and the estimated amount of time until the conditions of the milestone payments are met. This fair value measurement was based on significant inputs not observable in the market, representing a Level 3 measurement within the fair value hierarchy (see Note 3 for more information about fair value measurements). The key assumptions used to determine the fair value of the contingent consideration associated with the regulatory milestones at the acquisition dates included a discount rate and probability-adjusted milestone payment date ranges. The key assumptions used to determine the fair value of the contingent consideration associated with the commercial sales milestones at the acquisition dates included a discount rate and probability-weighted expected milestone payment date ranges based on the aggregate number of commercial units sold.

The fair value of recorded contingent consideration is re-measured at each reporting period with the change in fair value recognized within operating expense in our condensed consolidated statements of operations. We measure the liabilities on a recurring basis using Level 3 inputs. See Note 3 for further information regarding fair value measurements.

·In the first six months of 2015, the fair value of the Apica contingent consideration increased by $0.3 million, in which $0.31 million was reported as research and development (“R&D”) expense and ($0.01) million was reported as selling, general and administrative (“SG&A”) expense. The increase was primarily a result of accretion associated with the passage of time.

·We acquired certain assets and assumed certain liabilities from Terumo Corporation related to the DuraHeart II Left Ventricular Assist System product line (“DuraHeart II”) in June 2013. Under the terms of the DuraHeart II acquisition, the initial purchase consideration was $13.0 million and we will be obligated to make potential future milestone payments, based on regulatory approvals and product sales, of up to $43.5 million. In the first six months of 2015, the fair value of the DuraHeart II contingent consideration increased by $0.3 million (primarily reported as SG&A expense) as a result of a change in the discount rate and accretion associated with the passage of time. In the first six months of 2014, the fair value decreased by $3.2 million ($2.2 million reported as a reduction to R&D expense and $1.0 million reported as a reduction to SG&A expense) as a result of the changes in the probabilities of success and timing of when milestones were expected to be met.

·Our acquisition of the medical business of Levitronix LLC (“Levitronix Medical”) in August 2011 requires payments of future contingent consideration annually through August 2015, which is calculated as 36% of annual revenues above agreed upon revenue targets. In the first six months of 2015 and 2014, we paid $9.4 million and $7.0 million, respectively, related to the Levitronix Medical contingent consideration. In the first six months of 2015 and 2014, we recorded a re-measurement adjustment (increase) of $0.2 million and $1.7 million, respectively, which was reported as SG&A expense.

Note 3. Fair Value Measurements

Our financial assets and liabilities carried at fair value are primarily comprised of investments in money market funds, certificates of deposit, municipal and corporate bonds, commercial paper, U.S. government agency securities, variable demand notes, asset-backed securities, auction rate securities, forward contracts, certain investments held as assets under the deferred compensation plan, marketable equity securities and the contingent consideration in connection with acquisitions. The fair value accounting guidance requires that assets and liabilities be carried at fair value and classified in one of the following three categories:

Level 1: Quoted prices in active markets for identical assets or liabilities that we have the ability to access

Level 2: Observable market based inputs or unobservable inputs that are corroborated by market data such as quoted prices, interest rates and yield curves

Level 3: Inputs that are unobservable data points that are not corroborated by market data

We review the fair value hierarchy classification on a quarterly basis. Changes in the ability to observe valuation inputs may result in a reclassification of levels of certain securities within the fair value hierarchy. We recognize transfers into and out of levels within the fair value hierarchy in the period in which the actual event or change in circumstances caused the transfers to occur. There were no transfers between Level 1, Level 2 and Level 3 during either of the six months ended July 4, 2015 or June 28, 2014.

9

The following table represents the fair value hierarchy for our financial assets and financial liabilities measured at fair value on a recurring basis:

	Total Fair Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(in thousands)
At July 4, 2015:
Cash equivalents:
Money market funds	$	131,198	$	131,198	$	—	$	—
Corporate bonds	2,006		—		2,006		—
Municipal bonds	3,063		—		3,063		—
Short-term investments:
Municipal bonds	86,358		—		86,358		—
U.S. government agency securities	6,900		—		6,900		—
Corporate bonds	22,419		—		22,419		—
Commercial paper	12,792		—		12,792		—
Asset-backed securities	573		—		573		—
Prepaid expenses and other assets:
Foreign exchange contracts	188		—		188		—
Long-term investments:
Auction rate securities	4,212		—		—		4,212
Other long-term assets:
Investments included in our deferred compensation plan	1,870		—		1,870		—
Marketable equity securities	1,451		1,451		—		—
Other accrued liabilities:
Foreign exchange contracts	611		—		611		—
Contingent consideration (current and long-term portions)	$	38,019	$	—	$	—	$	38,019

	Total Fair Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(in thousands)
At January 3, 2015:
Cash equivalents:
Money market funds	$	34,742	$	34,742	$	—	$	—
Commercial paper	5,000		—		5,000		—
Corporate bonds	1,006		—		1,006		—
Municipal bonds	2,691		—		2,691		—
Short-term investments:
Municipal bonds	117,681		—		117,681		—
U.S. government agency securities	8,340		—		8,340		—
Corporate bonds	19,632		—		19,632		—
Commercial paper	10,297		—		10,297		—
Asset-backed securities	1,714		—		1,714		—
Prepaid expenses and other assets:
Foreign exchange contracts	3,759		—		3,759		—
Long-term investments:
Auction rate securities	4,239		—		—		4,239
Other long-term assets:
Investments included in our deferred compensation plan	1,552		—		1,552		—
Marketable equity securities	1,836		1,836		—		—
Other accrued liabilities:
Foreign exchange contracts	913		—		913		—
Contingent consideration (current and long-term portions)	$	46,558	$	—	$	—	$	46,558

10

Financial assets and liabilities are considered Level 2 when their fair values are determined using inputs that are observable in the market or can be derived principally from or corroborated by observable market data such as pricing for similar securities, recently executed transactions, cash flow models with yield curves, and benchmark securities. Our Level 2 financial assets and liabilities include short-term investments, foreign exchange instruments and certain of our deferred compensation plan securities. In addition, Level 2 financial instruments are valued using comparisons to like-kind financial instruments and models that use readily observable market data as their basis.

Financial assets and liabilities are considered Level 3 when their fair values are determined using pricing models, discounted cash flow methodologies, or similar techniques, and at least one significant model assumption or input is unobservable. Level 3 financial assets and liabilities include the following:

Auction rate securities—Due to limited market activity the determination of fair value requires significant judgment and estimates. The auction rate securities were valued using a discounted cash flow model over a five-year period based on estimated interest rates, the present value of future principal payments, and interest payments discounted at rates considered to reflect the current market conditions and the credit quality of auction rate securities.

Contingent liabilities—The fair value of the contingent consideration related to the acquisitions of Levitronix Medical, DuraHeart II and Apica requires significant management judgment and estimates. The fair value of each contingent consideration is re-measured at the end of each reporting period with the change in fair value recorded in operating expense on our condensed consolidated statements of operations. Actual amounts paid may differ from the obligations recorded. The fair value of the Levitronix Medical contingent consideration is calculated using the income approach, using various revenue assumptions and applying a probability to each scenario. The fair value of the DuraHeart II contingent consideration is calculated using the income approach, using various estimates, including probabilities of success, discount rate and the estimated amount of time until the conditions of the milestone payments are met. Refer to Note 2 for a discussion of the fair value of the contingent consideration associated with the Apica acquisition and further information regarding fair value measurements associated with the DuraHeart II acquisition.

Available-for-sale investments are carried at fair value and are included in the tables above under short- and long-term investments. The aggregate market value, cost basis and gross unrealized gains and losses of available-for-sale investments by major security type are as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
At July 4, 2015:
Short-term investments:
Municipal bonds	$	86,339	$	49	$	(30	)	$	86,358
U.S. government agency securities	6,901		—		(1		)	6,900
Corporate bonds	22,440				(21		)	22,419
Commercial paper	12,792		—		—			12,792
Asset-backed securities	573		—		—			573
Total short-term investments	$	129,045	$	49	$	(52	)	$	129,042
Long-term investments:
Auction rate securities	$	4,900	$	—	$	(688	)	$	4,212
Other long-term assets:
Marketable equity securities	2,996		—		(1,545		)	1,451
Total long-term	$	7,896	$	—	$	(2,233	)	$	5,663
At January 3, 2015:
Short-term investments:
Municipal bonds	$	117,614	$	83	$	(16	)	$	117,681
U.S. government agency securities	8,341		—		(1		)	8,340
Corporate bonds	19,655		1		(24		)	19,632
Commercial paper	10,297		—		—			10,297
Asset-backed securities	1,715		—		(1		)	1,714
Total short-term investments	$	157,622	$	84	$	(42	)	$	157,664
Long-term investments:
Auction rate securities	$	4,900	$	—	$	(661	)	$	4,239
Other long-term assets:
Marketable equity securities	2,996		—		(1,160		)	1,836
Total long-term	$	7,896	$	—	$	(1,821	)	$	6,075

11

As of July 4, 2015, our marketable equity securities have been in a continuous unrealized loss position for more than twelve months. We believe that the decline in fair value of the marketable equity securities below our cost basis is temporary and we intend to retain the securities for a sufficient period of time to allow for recovery in the market value of these investments.

Our deferred compensation plan includes our corporate owned life insurance policies and mutual fund investments. The underlying mutual fund investments are deemed trading securities. The mutual fund investments’ fair value and the cash surrender value of our corporate-owned life insurance policies are classified in the condensed consolidated balance sheets in “Other long-term assets.” The aggregate value of our deferred compensation plan assets as of July 4, 2015 and January 3, 2015 was $6.4 million and $6.0 million, respectively. The unrealized gain before tax from the change in the value of the deferred compensation plan was not significant in the six months ended July 4, 2015 and June 28, 2014.

The amortized cost and fair value of available-for-sale debt investments, by contractual maturity, were as follows:

	Amortized Cost		Fair Value
	(in thousands)
At July 4, 2015:
Maturing within 1 year	$	80,742	$	80,746
Maturing after 1 year through 5 years	48,303		48,296
Short-term available-for-sale investments	129,045		129,042
Maturing after 5 years	4,900		4,212
	$	133,945	$	133,254

The following table provides a roll forward of the fair value, as determined by Level 3 inputs, of the auction rate securities during the first six months of 2015:

	Auction Rate Securities
	(in thousands)
Balance as of January 3, 2015	$	4,239
Unrealized holding loss on auction rate securities, included in other comprehensive income	(27		)
Balance as of July 4, 2015	$	4,212

The following table provides a roll forward of the fair value, as determined by Level 3 inputs, of contingent consideration during the first six months of 2015:

	Contingent Consideration
	(in thousands)
Balance as of January 3, 2015	$	46,558
Payments	(9,357		)
Change in fair value	818
Balance as of July 4, 2015	$	38,019

12

The following table presents quantitative information about the inputs and valuation methodologies used for our fair value measurements classified in Level 3 of the fair value hierarchy at July 4, 2015 and January 3, 2015:

	Fair Value at July 4, 2015 (in thousands)		Valuation Methodology	Significant Unobservable Input	Weighted Average (range, if applicable)
Auction rate securities	$	4,212	Discounted cash flow	Discount rate	1.64	%
				Market credit spread	2.95	%
				Liquidity factor	0	%
Levitronix Medical Contingent consideration	$	5,782	Multiple outcome discounted cash flow	Revenue	$30.0 million
DuraHeart II Contingent consideration	$	5,501	Multiple outcome discounted cash flow	Milestone dates	2017 to 2026
				Discount rate	5.26% to 25%
				Percent probabilities assigned to scenarios	5% to 67%
Apica Contingent consideration	$	26,736	Multiple outcome discounted cash flow	Milestone dates	2016 to 2020
				Discount rate	5.26	%
				Percent probabilities assigned to scenarios	7.5% to 30%

	Fair Value at January 3, 2015 (in thousands)		Valuation Methodology	Significant Unobservable Input	Weighted Average (range, if applicable)
Auction rate securities	$	4,239	Discounted cash flow	Discount rate	1.61	%
				Market credit spread	2.83	%
				Liquidity factor	0	%
Levitronix Medical Contingent consideration	$	14,902	Multiple outcome discounted cash flow	Revenue	$29.4 million for fiscal year 2015; $50.0 million for fiscal year 2014
DuraHeart II Contingent consideration	$	5,189	Multiple outcome discounted cash flow	Milestone dates	2017 to 2026
				Discount rate	4.63% to 22.5%
				Percent probabilities assigned to scenarios	5% to 67%
Apica Contingent consideration	$	26,467	Multiple outcome discounted cash flow	Milestone dates	2016 to 2020
				Discount rate	4.63	%
				Percent probabilities assigned to scenarios	7.5% to 30%

Auction Rate Securities

The significant unobservable inputs used in the fair value measurement of the auction rate securities are the weighted average discount rate, market credit spread and liquidity factor. A significant increase (decrease) in the discount rate in isolation could result in a significantly higher (lower) fair value measurement, whereas a significant increase (decrease) in the market credit spread and liquidity factor in isolation could result in a significantly lower (higher) fair value measurement. Although the discount rate as compared to the market credit spread and liquidity factors are not directly related, they will generally move in opposite directions.

The fair value of auction rate securities is calculated on a quarterly basis by senior management based on a collaborative effort of the corporate treasury and accounting groups. To assess the reasonableness of the fair value measurement, management compares its fair value measurement to the values calculated by independent third parties.

13

Contingent Consideration

The fair values of contingent consideration are measured using projected payment dates, discount rates, probabilities of payments, and projected revenues (for revenue-based considerations). Projected contingent payment amounts are discounted back to the current period using a discounted cash flow model. A significant increase (decrease) in the projected revenue in isolation could result in a significantly higher (lower) fair value measurement; a significant delay (acceleration) in the product development (including projected regulatory milestone) achievement date in isolation could result in a significantly lower (higher) fair value measurement; a significant increase (decrease) in the discount rate in isolation could result in a significantly lower (higher) fair value measurement; and the changes in the probability of occurrence between the outcomes in isolation could result in a significant change in fair value measurement.

The fair values of the contingent consideration are calculated on a quarterly basis by management based on a collaborative effort of our regulatory, research and development, operations, finance and accounting groups, as appropriate. Potential valuation adjustments are made as additional information becomes available, including the progress toward achieving revenue and milestone targets as compared to initial projections, the impact of market competition and changes in actual and projected product mix and average selling price, with the impact of such adjustments being recorded in the consolidated statements of operations.

Assets and Liabilities That Are Measured at Fair Value on a Nonrecurring Basis

Non-marketable equity investments and non-financial assets, such as goodwill, intangible assets, and property, plant, and equipment (measured at fair value if a write-down is recognized) are evaluated for impairment annually or when indicators of impairment exist. Non-financial assets such as identified intangible assets acquired in connection with our acquisitions are measured at fair value using Level 3 inputs, which include discounted cash flow methodologies, or similar techniques, when there is limited market activity and the determination of fair value requires significant judgment and estimates. In addition, in evaluating the fair value of goodwill impairment, further corroboration is obtained using our market capitalization. No impairment was recorded in either the six months ended July 4, 2015 or June 28, 2014.

Note 4. Foreign Exchange Instruments

We utilize foreign currency forward exchange contracts and options with recognized financial institutions to manage our exposure to the impact of fluctuations in foreign currency exchange rates on certain intercompany balances and foreign currency denominated sales and purchase transactions. We do not use derivative financial instruments for speculative or trading purposes. These forward contracts are not designated as hedging instruments for accounting purposes. Principal hedged currencies include the Euro, British Pound Sterling, and U.S. Dollar. The periods of these forward contracts range up to approximately three months and the notional amounts are intended to be consistent with changes in the underlying exposures. We intend to exchange foreign currencies for U.S. Dollars at maturity.

Total gross notional amounts for outstanding derivatives instruments were as follows:

	July 4, 2015		January 3, 2015
Forward contracts:
Euro (sell)	€	11.4 million	€	15.8 million
British Pound Sterling (sell)	£	1.3 million	£	1.5 million
U.S. Dollar (sell)	$	40.8 million	$	21.2 million
U.S. Dollar (buy)	$	76.8 million	$	59.0 million

The following table shows the derivative instruments measured at gross fair value reported on the condensed consolidated balance sheets:

	As of July 4, 2015				As of January 3, 2015
	Prepaid expenses and other assets		Other accrued liabilities		Prepaid expenses and other assets		Other accrued liabilities
	(in thousands)
Derivatives not designated as hedging instruments (forward contracts)	$	188	$	611	$	3,759	$	913

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The following table shows the effect of derivative instruments not designated as hedging instruments and foreign currency transactions gains and losses which were included in “Interest income and other” in the condensed consolidated statements of operations:

	Three Months Ended						Six Months Ended
	July 4, 2015			June 28, 2014			July 4, 2015			June 28, 2014
	(in thousands)
Foreign currency exchange gain (loss) on foreign contracts	$	(1,547	)	$	(420	)	$	7,943		$	(67	)
Foreign currency transactions gain (loss)	1,887			291			(7,383		)	(119		)

Note 5. Balance Sheet and Statement of Operations Information

The following tables provide details of selected condensed consolidated balance sheets items as of the end of each period:

Inventories consisted of the following:

	July 4, 2015		January 3, 2015
	(in thousands)
Finished goods	$	27,457	$	24,871
Work in process	22,944		18,135
Raw materials	20,458		19,198
Total	$	70,859	$	62,204

Property, plant and equipment, net consisted of the following:

	July 4, 2015			January 3, 2015
	(in thousands)
Land, building and improvements	$	20,600		$	20,600
Equipment and capitalized software	57,295			56,696
Furniture and leasehold improvements	26,473			25,710
Total	104,368			103,006
Less accumulated depreciation	(54,997		)	(51,775		)
Total	$	49,371		$	51,231

As of July 4, 2015, we have $1.6 million of equipment from the DuraHeart II acquisition which is expected to be placed in service in 2015 and is included in the “Equipment and capitalized software” line in the table above.

Depreciation expense was $2.3 million and $4.6 million for the three and six months ended July 4, 2015, respectively, and $2.3 million and $4.4 million for the three and six months ended June 28, 2014, respectively.

Warranty and related costs are accrued for based on our best estimates when management determines that it is probable a charge or liability has been incurred and the amount of loss can be reasonably estimated. Warranty and related accruals and the changes in the balances for the six months ended July 4, 2015 and June 28, 2014 were as follows:

	July 4, 2015			June 28, 2014
	(in thousands)
Balance, beginning of the period	$	10,639		$	9,899
Additions	2,480			1,710
Change in estimate	614			—
Settlements	(5,085		)	(2,258		)
Balance, end of the period	$	8,648		$	9,351

Changes in Accumulated Other Comprehensive Loss by component during the six months ended July 4, 2015:

	Foreign currency items (A)			Unrealized gain (loss) on available-for-sale securities (A)			Total
	(in thousands)
Balance as of January 3, 2015	$	(20,781	)	$	(1,241	)	$	(22,022	)
Other comprehensive loss before reclassification	4,396			(274		)	4,122
Net current period other comprehensive loss	4,396			(274		)	4,122
Balance as of July 4, 2015	$	(16,385	)	$	(1,515	)	$	(17,900	)

(A)All amounts are net of tax.

15

Items included in “Other accrued liabilities” on our consolidated balance sheets that are in excess of 5% of total current liabilities are as follows:

	July 4, 2015		January 3, 2015
	(in thousands)
Deferred revenue	$	7,066	$	5,063

Interest income and other consisted of the following:

	Three Months Ended					Six Months Ended
	July 4, 2015		June 28, 2014			July 4, 2015		June 28, 2014
	(in thousands)
Interest income	$	177	$	201		$	325	$	425
Foreign currency, net	340		(130		)	560		(187		)
Other	170		488			619		568
Total interest income and other	687		559			1,504		806

Note 6. Goodwill and Purchased Intangible Assets, net

The carrying amount of goodwill and the changes in the balance for the six months ended July 4, 2015 were as follows (in thousands):

Balance as of January 3, 2015	$	225,293
Foreign currency translation impact	1,285
Balance as of July 4, 2015	$	226,578

Intangible assets (net of accumulated amortization and impairment) were as follows:

	At July 4, 2015
	Gross Amount			Accumulated Amortization			Accumulated Impairment			Net Amount
	(in thousands)
Intangible assets subject to amortization:
Patents and trademarks	$	43,532		$	(36,782	)	$	—		$	6,750
Core technology	37,180			(24,063		)	(12,642		)	475
Developed technology	133,373			(86,721		)	(42,079		)	4,573
Customer based relationships and other	7,243			(6,046		)	—			1,197
Pre-existing license agreement	2,300			(1,287		)	—			1,013
Foreign currency translation impact	95			—			—			95
	223,723			(154,899		)	(54,721		)	14,103
Intangible assets not yet subject to amortization:
DuraHeart II IPR&D	12,400			—			(7,700		)	4,700
Apica VAD Tool IPR&D	26,500			—			—			26,500
Foreign currency translation impact	(4,990		)	—			—			(4,990		)
Total intangible assets	$	257,633		$	(154,899	)	$	(62,421	)	$	40,313

	At January 3, 2015
	Gross Amount			Accumulated Amortization			Accumulated Impairment			Net Amount
Intangible assets subject to amortization:
Patents and trademarks	$	43,532		$	(36,095	)	$	—		$	7,437
Core technology	37,180			(23,854		)	(12,642		)	684
Developed technology	133,373			(85,613		)	(42,079		)	5,681
Customer based relationships and other	7,243			(5,569		)	—			1,674
Pre-existing license agreement	2,300			(1,123		)	—			1,177
Foreign currency translation impact	(411		)	—			—			(411		)
	223,217			(152,254		)	(54,721		)	16,242

16

Intangible assets not yet subject to amortization:
DuraHeart II IPR&D	12,400			—			(7,700		)	4,700
Apica VAD Tool IPR&D	26,500			—			—			26,500
Foreign currency translation impact	(2,954		)	—			—			(2,954		)
Total intangible assets	$	259,163		$	(152,254	)	$	(62,421	)	$	44,488

Amortization expense related to identifiable intangible assets was $1.2 million and $2.4 million for the three and six months ended July 4, 2015, respectively, and $1.9 million and $3.8 million for the three and six months ended June 28, 2014, respectively.

Estimated amortization expenses for the next five fiscal years and all years thereafter, excluding intangible assets not yet subject to amortization are as follows:

	(in thousands)
Fiscal year:
Remainder of 2015	$	2,306
2016	3,392
2017	2,520
2018	2,106
2019	1,712
Thereafter	2,067
Total	$	14,103

Note 7. Credit Facility

On December 19, 2011, we signed an unsecured revolving credit facility agreement that provides for up to $50.0 million revolving credit that will expire on December 19, 2016. The interest rate charged on the amounts borrowed is LIBOR plus a margin (ranging from 0.75% to 1.25%). The agreement contains financial covenants with which we were in compliance as of July 4, 2015. The credit agreement permits us to use the facility for working capital and general corporate purposes. We did not have any borrowings under this credit facility during the six months ended July 4, 2015 or June 28, 2014.

Note 8. Legal Proceeding

Legal Proceedings

From time to time we are involved in litigation arising out of claims in the normal course of business. Based on the information presently available, management believes that there are no claims or actions pending or threatened against us, the ultimate resolution of which will have a material effect on our financial position, liquidity or results of operations, although the results of litigation are inherently uncertain.

Purported Shareholder Class Action, filed January 2014

On January 24, 2014, we and three of our present and former officers were named as defendants in a putative shareholder class action entitled Cooper v. Thoratec Corp., Case No. 4:14-cv-00360, filed in the United States District Court for the Northern District of California. The action asserts violations of Section 10(b) of the Securities Exchange Act of 1934 (the “Exchange Act”), and Rule 10b-5 promulgated thereunder, as well as Section 20(a) of the Exchange Act. On April 21, 2014, the Court appointed Bradley Cooper as Lead Plaintiff. On June 20, 2014, Mr. Cooper filed an amended class action complaint (“Amended Complaint”), adding a former officer of the Company as a defendant. The Amended Complaint alleged that during proposed class period (April 29, 2010 to November 27, 2013, inclusive), Defendants made false or misleading statements in various SEC filings, press releases, earnings calls, and healthcare conferences regarding the Company’s business and outlook, focusing primarily on Defendants’ alleged failure to disclose that there was a purported, known increase in the rate of pump thrombosis for patients using the HeartMate II Left Ventricular Assist Device during the proposed class period. Plaintiff sought unspecified damages, among other relief. Defendants filed a motion to dismiss the Amended Complaint for failure to state a claim on August 19, 2014, which the Court granted in its entirety with leave to amend on November 26, 2014. Plaintiff filed a second amended complaint on January 20, 2015 (the “Second Amended Complaint”). In the Second Amended Complaint, Plaintiff amended the class period from May 11, 2011 to August 6, 2014, inclusive, dropped a former officer of the Company as a defendant, and added Plaintiff Todd Labak, who is intended to replace Mr. Cooper as the Lead Plaintiff because Mr. Cooper no longer has Thoratec stock purchases within the proposed class period, among other changes. On March 23, 2015, Defendants filed a motion to dismiss the Second Amended Complaint for failure to state a claim. The motion to dismiss is now fully briefed and the parties are awaiting a ruling by the Court.

17

Purported Shareholder Class Action Lawsuit, filed July 2015

On July 23, 2015, the Company and its directors were named as defendants in a purported class action shareholder lawsuit entitled Solak v. Grossman, which was filed in the Superior Court of California, County of Alameda in connection with our entrance into the Merger Agreement (as defined below) with St. Jude Medical, Inc. and certain other parties named therein. The lawsuit generally alleges that the members of our Board of Directors breached their fiduciary duties in negotiating and approving the Merger Agreement, that the Merger Agreement undervalues the Company, that our stockholders will not receive adequate or fair value for their common stock in the Merger (as defined below), and that the terms of the Merger Agreement impose improper deal protection terms that preclude competing offers.

Plaintiffs seek, among other things, to declare that the action is properly maintainable as a class action and to enjoin the Company from consummating the proposed Merger in the manner provided for by the Merger Agreement. Plaintiffs further seek unspecified money damages, costs and attorneys’ and experts’ fees. See also Note 14 titled “Subsequent Events” for a more detailed discussion of the Merger Agreement.

Although the results of litigation are inherently uncertain, based on the information currently available, we do not believe the ultimate resolution of the above named actions will have a material effect on our financial position, liquidity or results of operations.

Note 9. Share-Based Compensation

Our Amended and Restated 2006 Incentive Stock Plan (“2006 Plan”) permits the issuance of stock options (“options”), restricted stock units (“RSUs”), performance share units (“PSUs”) and other types of awards to employees, directors, and consultants. As of July 4, 2015, approximately 3.2 million shares remained available for future issuance under the 2006 Plan, which assumes that PSUs will convert at 100% of target.

Share-based compensation consisted of the following:

	Three Months Ended				Six Months Ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
	(in thousands)
Cost of product sales	$	675	$	756	$	1,458	$	1,377
Selling, general and administrative expenses	6,198		4,794		12,855		8,819
Research and development	2,580		2,283		4,537		4,419
Total share-based compensation expense before taxes	9,453		7,833		18,850		14,615
Tax benefit for share-based compensation expense	3,141		2,731		6,101		5,003
Total share-based compensation (net of taxes)	$	6,312	$	5,102	$	12,749	$	9,612

Stock Options

The fair value of each option is estimated at the date of grant using the Black-Scholes option-pricing model with the following assumptions:

	Three Months Ended				Six Months Ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
Risk free interest rate (weighted average)	1.50	%	2.21	%	1.52	%	2.19	%
Expected volatility	35	%	35	%	37	%	37	%
Expected option term (years)	5.60		5.88		5.14 to 5.82		4.54 to 5.04
Dividends	None		None		None		None

Stock option activity is summarized as follows:

	Number of Options (in thousands)		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contract Life (years)
Outstanding options as of January 3, 2015	2,737		$	31.04	6.95
Granted	211		41.22
Exercised	(802	)	29.25
Forfeited or expired	(62	)	35.83
Outstanding options as of July 4, 2015	2,084		32.61		7.31
Outstanding options exercisable as of July 4, 2015	933		29.82		5.77
Outstanding options vested as of July 4, 2015 and expected to vest	1,992		$	32.48	7.24

18

As of July 4, 2015, there was $8.3 million of unrecognized compensation expense, net of estimated forfeitures, related to options, which expense we expect to recognize over a weighted average period of 1.59 years. The weighted average grant-date fair value of options granted in the first six months of 2015 was $14.22 per share.

Restricted Stock Units

Restricted stock unit activity is summarized as follows:

	Number of Units (in thousands)		Weighted Average Grant-Date Fair Value		Weighted Average Remaining Contract Life (in years)
Outstanding units as of January 3, 2015	1,573		$	33.31	1.36
Granted	654		41.06
Released	(500	)	33.33
Forfeited or expired	(127	)	34.82
Outstanding units as of July 4, 2015	1,600		$	36.35	1.68

As of July 4, 2015, there was $48.8 million of unrecognized compensation expense, net of estimated forfeitures, related to RSUs, which amount we expect to recognize over 2.74 years.

Performance Share Units

We issue PSUs representing hypothetical shares of our common stock. Each PSU reflects multiple shares that may be issued to the award recipient, with the number of shares to be issued determined based on performance and market conditions (referred to as either a “Performance Condition PSU” or a “Market Condition PSU”). The actual number of shares the recipient receives at the end of a performance period may range from 0% up to 200% of the target shares granted. Recipients generally must remain employed by us on a continuous basis through the end of the applicable performance period in order to receive shares subject to that award. The stock-based compensation costs for these PSUs, net of estimated forfeitures, are recorded over the three- or four-year vesting period based on a graded accelerated vesting method.

With respect to Performance Condition PSUs, any change in estimates affecting the number of shares to be issued upon vesting of the PSUs would be accounted for as a cumulative adjustment to the compensation expense in the period in which the change occurs. In 2014, we issued approximately 69,000 Performance Condition PSUs and we expect that no shares will be issuable under such PSU’s based on a change in management’s estimate in 2014. There was no change in estimate in first six months of 2015.

On September 22, 2014, we granted approximately 188,000 Market Condition PSUs to our President and Chief Executive Officer. In the first quarter of 2015, we granted approximately 115,000 Market Condition PSUs to certain employees of the Company. Share-based compensation expense related to all Market Condition PSUs was $1.3 million and $1.9 million in the three and six months ended July 4, 2015, respectively. As of July 4, 2015, we had $9.9 million of unrecognized compensation expense, net of estimated forfeitures, which we expect to recognize over a weighted average period of 2.07 years.

Note 10. Common and Preferred Stock

On December 5, 2013, the Board of Directors authorized a program to repurchase up to $200.0 million of our shares of common stock (“December 2013 program”), which will expire on December 31, 2015. In the three and six months ended July 4, 2015, we repurchased $4.6 million and $22.9 million, respectively, of shares of our common stock under the December 2013 program, of which $0.3 million was unsettled and accrued in our condensed consolidated balance sheet as of July 4, 2015. As of July 4, 2015, $72.1 million was available for repurchases of shares of our common stock under the December 2013 program. The December 2013 program may be accelerated, suspended, delayed or discontinued at any time.

We are incorporated in California, and as California law does not recognize treasury stock, the shares repurchased decreased the common shares outstanding. We recorded the $22.9 million of shares repurchased in the six months ended July 4, 2015 by reducing the additional paid-in capital (“APIC”) balance by the average value per share reflected in the account prior to the repurchase and allocating the excess as a reduction of retained earnings. Based on this allocation, APIC decreased by $8.0 million and retained earnings decreased by $14.9 million.

19

We also purchased shares of our common stock that were not part of our publicly announced repurchase program, which represent the surrender value of shares of restricted stock units withheld in order to satisfy tax withholding obligations upon vesting. The shares purchased do not reduce the dollar value that may yet be purchased under our publicly announced repurchase programs. The aggregate value of shares purchased in the six months ended July 4, 2015 was $6.0 million, which decreased APIC and retained earnings by $1.9 million and $4.1 million, respectively, based on the same allocation methodology discussed above.

Note 11. Income Taxes

During the first quarter of fiscal 2015, we recorded a $2.3 million out-of-period adjustment to income tax expense related to the overstatement of certain tax benefits from 2011 to 2014. The adjustment was not considered material to the financial statements for the six month period ended July 4, 2015, or any previously issued interim or annual consolidated financial statements.

Our effective income tax rates for the three months ended July 4, 2015 and June 28, 2014 were 30.4% and 32.5%, respectively. Our effective income tax rates for the six months ended July 4, 2015 and June 28, 2014 were 36.4% and 32.6%, respectively. For the three months ended July 4, 2015, the decrease is primarily due to a higher mix of income generated in lower tax rate jurisdictions. For the first six months of 2015, the increase is primarily due to the out-of-period adjustment discussed above and was partially offset by a higher mix of income generated in lower tax rate jurisdictions.

During the next 12 months, it is reasonably possible that audit resolutions and the expiration of statutes of limitations could reduce our unrecognized tax benefits by up to $1.5 million. However, this amount may be subject to change as a result of final determinations by taxing authorities throughout the year.

Note 12. Segment and Geographic Information

We have one operating segment and, and therefore, one reportable segment which develops, manufactures and markets proprietary medical devices used for mechanical circulatory support for the treatment of heart failure patients. Our chief operating decision-maker reviews financial information presented on a consolidated basis for purposes of making operating decisions and assessing financial performance, accompanied by disaggregated revenue information by product line. We do not assess the performance of our individual product lines on measures of profit or loss, or asset-based metrics. Therefore, the information below is presented only for revenues by product line, geography, and certain revenue category.

Product sales attributed to a country or region include product sales to hospitals, physicians and distributors and are based on final destinations where the products are sold. No individual customer or individual country outside of the U.S. accounted for more than 10% of product sales during the three and six months ended July 4, 2015 or during the three and six months ended June 28, 2014.

	Three Months Ended				Six Months Ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
	(in thousands)
Product sales by geographic location:
Domestic	$	104,293	$	94,172	$	200,386	$	189,777
International	24,399		23,891		49,614		53,983
Total	$	128,692	$	118,063	$	250,000	$	243,760

	Three Months Ended				Six Months Ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
	(in thousands)
Product sales by product line:
HeartMate	$	113,684	$	101,975	$	218,740	$	211,986
CentriMag	13,373		13,111		27,215		26,105
PVAD and IVAD	815		2,497		2,546		4,749
Other	820		480		1,499		920
Total	$	128,692	$	118,063	$	250,000	$	243,760

	Three Months Ended				Six Months Ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
	(in thousands)
Product sales by category:
Pump	$	93,042	$	81,583	$	179,938	$	170,883
Non-Pump	34,830		36,000		68,563		71,957
Other	820		480		1,499		920
Total	$	128,692	$	118,063	$	250,000	$	243,760

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13. Net Income Per Share

We calculate basic earnings per share (“EPS”) using net earnings and the weighted-average number of shares outstanding during the reporting period. Diluted EPS includes any dilutive effect of outstanding options and RSUs. PSUs are excluded from the shares used to compute diluted EPS until the performance conditions associated with the PSUs are met.

The reconciliations of the numerators and denominators of each of the basic and diluted EPS calculations were as follows:

	Three Months Ended				Six Months Ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
	(in thousands, except per share data)
Numerator:
Net Income	$	13,248	$	17,413	$	24,028	$	35,652
Denominator:
Weighted average shares used to compute basic EPS	54,481		56,723		54,246		56,781
Dilutive effect of share-based compensation plans	780		465		909		757
Weighted average shares used to compute diluted EPS	55,261		57,188		55,155		57,538
Net income per share:
Basic	$	0.24	$	0.31	$	0.44	$	0.63
Diluted	$	0.24	$	0.30	$	0.44	$	0.62

Potential common share equivalents excluded where the inclusion would be anti-dilutive are as follows:

	Three Months Ended		Six Months Ended
	July 4, 2015	June 28, 2014	July 4, 2015	June 28, 2014
	(in thousands)
Options to purchase shares not included in the computation of diluted net income per share because their inclusion would be anti-dilutive	184	461	257	749

14. Subsequent Event

On July 21, 2015, the Company, St. Jude Medical, Inc., a Minnesota corporation (“St. Jude Medical”), and Spyder Merger Corporation, a California corporation and a wholly-owned subsidiary of St. Jude Medical (“Merger Sub”), entered into an Agreement and Plan of Merger (the “Merger Agreement”), pursuant to which Merger Sub will, subject to the satisfaction or waiver of the conditions set forth in the Merger Agreement, merge with and into the Company, and the Company will survive the merger and continue as a wholly-owned subsidiary of St. Jude Medical (the “Merger”). All issued and outstanding shares of Company stock immediately prior to the effective time of the Merger (the “Effective Time”) will be cancelled and converted into the right to receive the merger consideration specified therein, in each case upon the terms and subject to the conditions set forth in the Merger Agreement.

Under the terms of the Merger Agreement, the Company’s shareholders will receive $63.50 in cash, without interest, for each share of the Company’s common stock they own at the Effective Time. The transaction is conditioned upon, among other things, Company shareholder approval, regulatory approvals and other customary closing conditions. The Merger Agreement includes customary representations, warranties and covenants of the Company and St. Jude Medical. The Company has agreed to operate its business and the business of its subsidiaries in the ordinary course of business consistent with past practices through the Effective Time. The transaction is expected to be completed in the fourth quarter of 2015.

The Merger Agreement includes a “go-shop” period, during which the Company will actively solicit alternative proposals from third parties for a period of 30 days from the date of the Merger Agreement continuing through August 20, 2015. The Merger Agreement provides for the Company to pay a termination fee of approximately $30 million to St. Jude Medical if the Company terminates the Merger Agreement in connection with a superior proposal that arises during the go-shop period and a termination fee of approximately $111 million if the Company terminates the Merger Agreement in connection with a superior proposal that arises following the go-shop period. See also Note 8 titled “Legal Proceedings — Purported Shareholder Class Action Lawsuit, filed July 2015” for a discussion on litigation related to the proposed Merger.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Forward-Looking Statements

This Quarterly Report on Form 10-Q includes forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. These statements can be identified by the words “expects,” “projects,” “believes,” “intends,” “should,” “estimate,” “will,” “would,” “may,” “anticipates,” “plans,” “could” and other similar words. Actual results, events or performance could differ materially from these forward-looking statements based on a variety of factors, many of which are beyond our control. Therefore, readers are cautioned not to put undue reliance on these statements. Factors that could cause actual results or conditions to differ from those anticipated by these and other forward-looking statements include those more fully described in the “Risk Factors” section of our 2014 Annual Report on Form 10-K and in other documents we file with the Securities and Exchange Commission (“SEC”). These forward-looking statements speak only as of the date hereof. We are not under any obligation, and we expressly disclaim any obligation, to publicly release any revisions or updates to these forward-looking statements that may be made to reflect events or circumstances after the date hereof, or to reflect the occurrence of unanticipated events.

The following presentation of management’s discussion and analysis of our financial condition and results of operations should be read together with our unaudited condensed consolidated financial statements included in this Quarterly Report on Form 10-Q.

OVERVIEW

Thoratec Corporation (“we,” “our,” “us,” or the “Company”) is a world leader in mechanical circulatory support with a product portfolio to treat the full range of clinical needs for advanced heart failure patients. We develop, manufacture and market proprietary medical devices used for mechanical circulatory support (“MCS”) for the treatment of heart failure (“HF”) patients. For chronic circulatory support for HF patients, our primary product lines are our ventricular assist devices (“VADs”): HeartMate II Left Ventricular Assist System (“HeartMate II”), HeartMate III Left Ventricular Assist System (“HeartMate III”), and Thoratec Paracorporeal Ventricular Assist Device (“PVAD”). We refer to HeartMate II and HeartMate III collectively as the “HeartMate product line” and PVAD as the “Thoratec product line.” For acute circulatory support, our product lines are CentriMag Acute Circulatory System (“CentriMag”) and for pediatric patients PediMag/PediVAS Acute Circulatory System (“PediMag/PediVAS”). HeartMate II, PVAD, IVAD, CentriMag and PediMag/PediVAS are approved by the U.S. Food and Drug Administration (“FDA”), and have received Conformité Européene (“CE”) Mark approval in Europe.

MCS devices supplement the pumping function of the heart in patients with HF. In most cases, a cannula connects the left ventricle of the heart to a blood pump. Blood flows from the left ventricle to the pump chamber via the cannula, powered by an electric or air driven mechanism that drives the blood through another cannula into the aorta. From the aorta, the blood then circulates throughout the body. Mechanical or tissue valves enable unidirectional flow in some devices. Currently, the power source remains outside the body for all FDA-approved MCS devices. Some of our devices can also provide support for the right side of the heart.

HeartMate III, a centrifugal-flow, chronic, left ventricular assist system, is currently in U.S. Investigational Device Exemption (“IDE”) and Conformité Européene Mark clinical trials and has not yet been approved for commercial sales. The HeartMate III U.S. clinical trial is a randomized non-inferiority study comparing HeartMate III with HeartMate II and includes a primary endpoint of survival free of device replacement and debilitating stroke. In 2014, the trial began enrollment in a safety phase under conditional approval from the FDA for 30 patients at five sites. In early 2015, enrollment broadened up to 60 sites following full approval from the FDA based on 30-day follow-up data from the initial safety phase. The trial provides that the first 294 randomized patients will be followed for six months to evaluate a short-term indication such as Bridge-to-Transplantation. The first 366 randomized patients will be followed for 24 months to evaluate a long-term indication such as Destination Therapy. The trial also allows for approximately 600 additional randomized patients to be enrolled beyond the pivotal cohort in order to assess secondary endpoints. In 2014, fifty patients were enrolled in the CE Mark trial at ten locations in Europe, Central Asia, Canada and Australia. The CE Mark trial evaluates patient six month survival, which was reached in May 2015. HeartMate III, which incorporates a fully magnetically levitated technology foundation, is designed to lower adverse event rates through improved hemocompatibility and to enhance the ease of surgical placement through a compact size.

Our product portfolio of commercially approved implantable and external MCS devices is described below.

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HeartMate II

HeartMate II is an implantable, electrically powered, continuous flow, left ventricular assist device (“LVAD”) consisting of a rotary blood pump designed to provide intermediate and long-term MCS. HeartMate II is designed to improve survival and quality of life for a broad range of advanced HF patients. Significantly smaller than our previous generation device and with only one moving part, HeartMate II is simpler and designed to operate more quietly than pulsatile devices.

HeartMate II received FDA approval in April 2008 for bridge-to-transplantation (“BTT”) and received FDA approval for use in HF patients who are not eligible for heart transplantation (“Destination Therapy” or “DT”) in January 2010. In November 2005, we completed the required conformity assessment procedure and design dossier reviews to be given authority from our Notified Body to affix the CE Mark to the HeartMate II for marketing in Europe. HeartMate II is the world’s most widely used LVAD.

CentriMag

The CentriMag is an extracorporeal circulatory support device that provides hemodynamic stabilization in patients in need of cardiopulmonary support. The CentriMag Pump is electronically driven, centrifugal pump based on bearingless motor technology. CentriMag is cleared by the FDA for use up to six hours in patients requiring short-term extracorporeal circulatory support during cardiac surgery. Additionally, CentriMag is approved under an FDA humanitarian device exemption (“HDE”) to be used as a right ventricular assist device for periods of support up to thirty days in patients in cardiogenic shock due to acute right ventricular failure. The device is marketed in Europe to provide support for up to thirty days for both cardiac and respiratory failure.

PediMag/PediVAS

PediMag and PediVAS are identical, extracorporeal full-flow acute surgical support platforms incorporating a polycarbonate pump, based on magnetically levitated bearingless motor technology, designed to provide acute surgical support to pediatric patients. The brand names differ according to indication for use, duration of support, and regulatory approval. PediMag is cleared by the FDA for use, in conjunction with the CentriMag console and motor, for support periods of up to six hours. Outside the U.S., the device is branded as PediVAS. This device has been CE Marked for marketing in Europe to provide support for up to 30 days for both cardiac and respiratory failure.

PVAD

PVAD is an external, pulsatile VAD, FDA-approved for BTT and post-cardiotomy myocardial recovery. PVAD is a paracorporeal device that is less invasive than implantable VADs since only the cannulae are implanted. The paracorporeal nature of PVAD provides several benefits including shorter implantation times and the ability to use the device in smaller patients.

PVAD is designed for short-to-intermediate duration for post-cardiotomy myocardial recovery following cardiac surgery and BTT. PVAD and IVAD, described below, offer left, right or biventricular support for use for BTT. This characteristic is significant because the vast majority of BTT patients treated with PVAD and IVAD require right as well as left-side ventricular assistance. PVAD and IVAD are also the only devices approved for both BTT and recovery following cardiac surgery. PVAD incorporates our proprietary biomaterial, Thoralon, which has high tissue and blood compatibility and is resistant to blood clots.

PVAD received FDA approval for BTT in December 1995 and for recovery (post-cardiotomy) in May 1998. In June 1998, we completed the required conformity assessment procedure and design dossier reviews to be given authority from our Notified Body to affix the CE Mark to the PVAD, allowing for its commercial sale in Europe.

Critical Accounting Policies and Estimates

Our unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America. Preparation of these statements requires management to make judgments and estimates. Some accounting policies have a significant impact on amounts reported in these financial statements. A summary of significant accounting policies and a description of accounting policies that are considered critical may be found in our 2014 Annual Report on Form 10-K, in the Notes to the Consolidated Financial Statements (Note 1) and the Critical Accounting Policies and Estimates section in Management’s Discussion and Analysis of Financial Condition and Results of Operations. There have been no changes in these significant accounting policies during the six months ended July 4, 2015.

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Results of Operations

The following table sets forth selected unaudited condensed consolidated statements of operations data for the periods indicated and as a percentage of total product sales:

	Three Months Ended										Six Months Ended
	July 4, 2015					June 28, 2014					July 4, 2015					June 28, 2014
	(in thousands, except for percentage data)
Product sales	$	128,692		100.0	%	118,063			100.0	%	$	250,000		100.0	%	$	243,760		100.0	%
Cost of product sales	39,897			31.0		34,307			29.1		77,026			30.8		74,333			30.5
Gross profit	88,795			69.0		83,756			70.9		172,974			69.2		169,427			69.5
Operating expenses:
Selling, general and administrative	43,932			34.1		35,477			30.1		84,049			33.6		70,978			29.1
Research and development	26,511			20.6		23,048			19.5		52,628			21.1		46,387			19.0
Total operating expenses	70,443			54.7		58,525			49.6		136,677			54.7		117,365			48.1
Income from operations	18,352			14.3		25,231			21.3		36,297			14.5		52,062			21.4
Other income and (expense):
Interest expense	(13		)	—		(2		)	—		(13		)	—		(2		)	—
Interest income and other	687			0.5		559			0.5		1,504			0.6		806			0.3
Income before income taxes	19,026			14.8		25,788			21.8		37,788			15.1		52,866			21.7
Income tax expense	(5,778		)	(4.5	)	(8,375		)	(7.1	)	(13,760		)	(5.5	)	(17,214		)	(7.1	)
Net income	$	13,248		10.3		$	17,413		14.7		$	24,028		9.6		$	35,652		14.6

Three and six months ended July 4, 2015 and June 28, 2014

Product Sales

Product sales consisted of the following:

	Three Months Ended						Six Months Ended
	July 4, 2015		June 28, 2014		% Change		July 4, 2015		June 28, 2014		% Change
	(in thousands)						(in thousands)
Total product sales	$	128,692	$	118,063	9.0	%	$	250,000	$	243,760	2.6	%

In the second quarter of 2015 as compared to the second quarter of 2014, product sales increased by $10.6 million or 9.0%, driven by increased sales volume of our HeartMate II, which was partially offset by a decrease in sales volume of our PVAD products. HeartMate II contributed $11.7 million to the increase due primarily to higher sales activity in the U.S. We also experienced an increase of $0.6 million in sales of the CentriMag and other product lines, while the PVAD product line declined by $1.7 million. From a regional perspective, U.S. sales increased by $10.1 million and international sales increased by $0.5 million in 2015 as compared to 2014, respectively.

In the first six months of 2015 as compared to the first six months of 2014, product sales increased by $6.2 million or 2.6%, driven by increased sales volume of our HeartMate II and our CentriMag products. HeartMate II contributed $6.7 million to the increase due primarily to higher sales activity in the U.S. We also experienced an increase of $1.7 million in sales of the CentriMag and other product lines, while the PVAD product line declined by $2.2 million. From a regional perspective, U.S. sales increased by $10.6 million and international sales decreased by $4.4 million in 2015 as compared to 2014, respectively.

Sales originating outside of the U.S. and U.S. export sales collectively accounted for approximately 19% and 20% of our total product sales for each of the second quarter of 2015 and the second quarter of 2014, respectively, and approximately 20% and 22% of our total product sales for each of the first six months of 2015 and the first six months of 2014, respectively.

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Gross Profit

Gross profit and gross margin were as follows:

	Three Months Ended						Six Months Ended
	July 4, 2015			June 28, 2014			July 4, 2015			June 28, 2014
	(in thousands, except percentages)
Total gross profit	$	88,795		$	83,756		$	172,974		$	169,427
Total gross margin	69.0		%	70.9		%	69.2		%	69.5		%

In the second quarter of 2015 as compared to the second quarter of 2014, gross margin percentage decreased by 1.9 percentage points primarily due to unfavorable manufacturing variances, higher inventory reserve charges, and unfavorable foreign exchange rate fluctuation, in part offset by lower intangible amortization expense. During the first six months of 2015 as compared to the first six months of 2014, gross margin percentage was relatively unchanged.

Selling, General and Administrative Expenses

Selling, general and administrative expenses were as follows:

	Three Months Ended						Six Months Ended
	July 4, 2015		June 28, 2014		% Change		July 4, 2015		June 28, 2014		% Change
	(in thousands)						(in thousands)
Total selling, general and administrative expenses	$	43,932	$	35,477	23.8	%	$	84,049	$	70,978	18.4	%

In the second quarter of 2015 as compared to the second quarter of 2014, selling, general and administrative expenses (SG&A) increased by $8.5 million primarily due to $6.5 million of higher personnel and stock-based compensation expenses and $1.5 million of incremental legal expenses. The increase of $13.1 million in SG&A expense in the first six months of 2015 as compared to the first six months of 2014 was primarily due to $12.3 million of higher personnel and stock-based compensation expenses and $0.8 million in other administrative expenses.

Research and Development Expenses

Research and development expenses were as follows:

	Three Months Ended						Six Months Ended
	July 4, 2015		June 28, 2014		% Change		July 4, 2015		June 28, 2014		% Change
	(in thousands)						(in thousands)
Total research and development expenses	$	26,511	$	23,048	15.0	%	$	52,628	$	46,387	13.5	%

Research and development (“R&D”) expenses are largely project-driven, and fluctuate based on the level of project activity planned and subsequently approved and conducted.

In the second quarter of 2015 as compared to the second quarter of 2014, R&D expenses increased by $3.5 million primarily due to $2.3 million of higher personnel and stock-based compensation expenses, the remeasurement of our estimated contingent consideration of $0.4 million associated with our acquisitions, and other expenses of $0.8 million. In the first six months of 2015 as compared to the first six months of 2014, R&D expenses increased by $6.2 million primarily due to $3.1 million of higher personnel and stock-based compensation expenses, the remeasurement of our estimated contingent consideration of $2.5 million associated with our acquisitions, and other expenses of $0.6 million.

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Interest Income and Other

Interest income and other consisted of the following:

	Three Months Ended							Six Months Ended
	July 4, 2015		June 28, 2014			% Change		July 4, 2015		June 28, 2014			% Change
	(in thousands)							(in thousands)
Interest income	$	177	$	201		(11.9	)%	$	325	$	425		(23.5	)%
Foreign currency, net	340		(130		)	361.5	%	560		(187		)	399.5	%
Other	170		488			(65.2	)%	619		568			9.0	%
Total interest income and other	$	687	$	559				$	1,504	$	806

Interest income and Other were relatively unchanged in the second quarter and first six months of 2015 as compared to the same periods in 2014. The change in foreign currency, net was primarily driven by changes in foreign exchange rates and favorable foreign currency re-measurement related to the Apica contingent consideration in the second quarter and first six months of 2015 as compared to same periods in 2014.

Income Taxes

During the first quarter of fiscal 2015, we recorded a $2.3 million out-of-period adjustment to income tax expense related to the overstatement of certain tax benefits from 2011 to 2014. The adjustment was not considered material to the interim period ended July 4, 2015, or any previously issued interim or annual consolidated financial statements.

Our effective income tax rates for the three months ended July 4, 2015 and June 28, 2014 were 30.4% and 32.5%, respectively. Our effective income tax rates for the six months ended July 4, 2015 and June 28, 2014 were 36.4% and 32.6%, respectively. For the three months ended July 4, 2015, the decrease is primarily due to a higher mix of income generated in lower tax rate jurisdictions. For the first six months of 2015, the increase is primarily due to the out-of-period adjustment discussed above and was partially offset by a higher mix of income generated in lower tax rate jurisdictions.

Our effective tax rate is calculated based on the statutory tax rates imposed on projected annual pre-tax income or loss in various jurisdictions. Because changes in our forecasted earnings for 2015 can significantly affect our projected annual effective tax rate, our quarterly tax rate could fluctuate significantly depending on our profitability.

Liquidity and Capital Resources

Cash, Cash Equivalents and Investments

Cash and cash equivalents include highly liquid financial instruments that are readily convertible to cash and have maturities of 90 days or less from the date of purchase.

Investments classified as short-term consist of various financial instruments such as municipal bonds, corporate bonds, variable demand notes, commercial paper, certificates of deposit, and asset-backed securities. Bonds with high credit quality with maturities of greater than 90 days when purchased are classified as short-term available-for-sale investments. Investments classified as long-term consist of our investments in auction rate securities.

Following is a summary of our cash, cash equivalents and investments:

	July 4, 2015		January 3, 2015
	(in thousands)
Cash and cash equivalents	$	144,925	$	72,814
Short-term investments	129,042		157,664
Long-term investments	4,212		4,239
Total cash, cash equivalents and investments	$	278,179	$	234,717

We believe that cash and cash equivalents, short-term available-for-sale investments on hand and expected cash flows from operations will be sufficient to fund our operations, capital requirements, and share repurchase programs for at least the next 12 months.

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Cash Flow Activities

	July 4, 2015			June 28, 2014
	(in thousands)
Net cash provided by operating activities	$	55,724		$	40,834
Net cash provided by investing activities	23,134			6
Net cash used in financing activities	(12,064		)	(45,481		)
Effect of exchange rate changes on cash and cash equivalents	5,317			271
Net increase (decrease) in cash and cash equivalents	72,111			(4,370		)

Cash Provided by Operating Activities

Cash provided by operating activities in the first six months of 2015 was $55.7 million and consisted of net income of $24.0 million, adjustments for non-cash items of $32.9 million, and cash used in working capital of $1.2 million. Adjustments for non-cash items primarily consisted of $18.9 million of stock-based compensation expense, $5.1 million of foreign currency remeasurement, $6.9 million of depreciation and amortization expense, and the remeasurement of the contingent consideration of $0.8 million. The decrease in cash from the changes in working capital activities primarily consisted of increases in inventory and accounts receivable totaling $18.8 million, offset by decreases in other current and non-current assets, accounts payable and other liabilities totaling $17.6 million.

Cash provided by operating activities in the first six months of 2014 was $40.8 million and consisted of net income of $35.7 million, adjustments for non-cash items of $23.1 million, and cash used in working capital of $17.9 million. Adjustments for non-cash items primarily consisted of $14.6 million of stock-based compensation expense and $8.2 million of depreciation and amortization expense, offset in part by $1.0 million for excess tax benefits from stock-based compensation. The decrease in cash from the changes in working capital activities primarily consisted of an increase in inventory of $8.1 million primarily from higher HeartMate product line inventory, offset in part by a decrease in accounts receivable of $3.7 million from higher collections in the first six months of 2014. Decreases to accounts payable and other liabilities totaling $14.0 million also contributed to cash provided by operating activities.

Cash Provided by Investing Activities

Cash provided by investing activities in the first six months of 2015 of $23.1 million was primarily attributable to maturities and sales of available for sale investments of $116.9 million, which was offset by the purchase of available for sale investments of $91.0 million and capital expenditures of $2.8 million to support our manufacturing facilities and administration growth.

Cash provided by investing activities in the first six months of 2014 was primarily attributable to sales and maturities of available for sale investments of $94.2 million, which was offset by purchases of available for sale investments of $86.9 million, capital expenditures of $5.3 million to support our manufacturing facilities and administration growth, and a note receivable from Apica of $2.0 million.

Cash Used in Financing Activities

Cash used in financing activities in the first six months of 2015 of $12.1 million was primarily comprised of $26.3 million used to repurchase shares of our common stock under the stock repurchase programs authorized, $6.0 million used to repurchase vested restricted stock units for settlement of income tax withholding liabilities and $7.7 million paid in contingent consideration. This amount was offset in part by $23.5 million of proceeds related to stock option exercises, $2.5 million of proceeds from stock issued under the employee stock purchase plan, and $1.9 million from excess tax benefits for share-based compensation.

Cash used in financing activities in the first six months of 2014 of $45.5 million was primarily comprised of $39.1 million used for repurchases of 1.1 million shares of our common stock under the stock repurchase programs authorized, $6.9 million used to repurchase vested restricted stock units for settlement of income tax withholding liabilities and $6.1 million paid in contingent consideration. This amount was offset in part by $2.9 million of proceeds related to stock option exercises, $2.8 million of proceeds from stock issued under the employee stock purchase plan, and $1.0 million from excess tax benefits for share-based compensation.

Stock Repurchase Program

On December 5, 2013, the Board of Directors authorized a program to repurchase up to $200.0 million of our shares of common stock (“December 2013 program”), which will expire on December 31, 2015. In the three and six months ended July 4, 2015, we repurchased $4.6 million and $22.9 million, respectively, of shares of our common stock under the December 2013 program, of which $0.3 million was unsettled and accrued in our condensed consolidated balance sheet as of July 4, 2015. As of July 4, 2015, $72.1 million was available for repurchases of shares of our common stock under the December 2013 program. The December 2013 program may be accelerated, suspended, delayed or discontinued at any time.

27

We are incorporated in California, and as California law does not recognize treasury stock, the shares repurchased decreased the common shares outstanding. We recorded the $22.9 million of shares repurchased in the six months ended July 4, 2015 by reducing the additional paid-in capital (“APIC”) balance by the average value per share reflected in the account prior to the repurchase and allocating the excess as a reduction of retained earnings. Based on this allocation, APIC decreased by $8.0 million and retained earnings decreased by $14.9 million.

We also purchased shares of our common stock that were not part of our publicly announced repurchase program, which represent the surrender value of shares of restricted stock units withheld in order to satisfy tax withholding obligations upon vesting. The shares purchased do not reduce the dollar value that may yet be purchased under our publicly announced repurchase programs. The aggregate value of shares purchased in the six months ended July 4, 2015 was $6.0 million, which decreased APIC and retained earnings by $1.9 million and $4.1 million, respectively, based on the same allocation methodology discussed above.

Credit Facility

On December 19, 2011, we signed an unsecured revolving credit facility agreement that provides for up to $50.0 million revolving credit that will expire on December 19, 2016. The interest rate charged on the amounts borrowed is LIBOR plus a margin (ranging from 0.75% to 1.25%). The agreement contains financial covenants with which we were in compliance as of July 4, 2015. The credit agreement permits us to use the facility for working capital and general corporate purposes. We did not have any borrowings under this credit facility during the six months ended July 4, 2015 or June 28, 2014.

Contractual Obligations

As of July 4, 2015, the liability for uncertain tax positions was $13.5 million, including interest and penalties. Due to the high degree of uncertainty regarding the timing of potential future cash flows associated with these liabilities, we are unable to make a reasonably reliable estimate of the amount and period in which these liabilities might be paid.

During the six months ended July 4, 2015, there were no material changes to our contractual obligations reported in our 2014 Annual Report on Form 10-K.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Interest Rate Risk

A 50 basis point reduction in interest rates on our investment portfolio and cash equivalents that bear variable interest would have an immaterial impact to interest income on the consolidated statements of operations. In addition, if interest rates were to rise, the market value of our investment portfolio would decline, which could result in a loss if we were to choose or be forced to sell an investment before its scheduled maturity. If interest rates were to rise or fall from current levels by 100 basis points, the change in our net unrealized loss on our short and long-term investments would be $1.0 million. We do not utilize derivative financial instruments to manage interest rate risks.

Foreign Currency Rate Fluctuations

The fair value of our forward currency-exchange contracts is sensitive to changes in currency exchange rates and is estimated based on the amount that we would pay or receive upon termination of the contracts, taking into account the change in currency exchange rates. A 10% directional change in the non-functional currency exchange rates as of July 4, 2015 related to our contracts would result in an increase in the unrealized gain or loss on forward currency-exchange contracts of $11.6 million. The unrealized gains or losses on forward currency-exchange contracts resulting from changes in currency exchange rates are expected to approximately offset losses or gains on the currency exposures resulting from our operations.

28

ITEM 4. CONTROLS AND PROCEDURES

Attached as exhibits to this Form 10-Q are certifications of our Chief Executive Officer and Chief Financial Officer, which are required in accordance with Rule 13a-14 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). This “Controls and Procedures” section includes information concerning the controls and controls evaluation referred to in the certifications.

Disclosure Controls and Procedures

An evaluation was performed under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Exchange Act, as of July 4, 2015. The evaluation of our disclosure controls and procedures included a review of our processes and implementation and the effect on the information generated for use in this Quarterly Report on Form 10-Q. In the course of this evaluation, we sought to identify any significant deficiencies or material weaknesses in our disclosure controls and procedures to determine whether we had identified any acts of fraud involving personnel who have a significant role in our disclosure controls and procedures, and to confirm that necessary corrective action, including process improvements, was taken. This type of evaluation is done quarterly so that our conclusions concerning the effectiveness of these controls can be reported in our periodic reports filed with the SEC. The overall goals of these evaluation activities are to monitor our disclosure controls and procedures and to make modifications as necessary. We intend to maintain these disclosure controls and procedures, modifying them as circumstances warrant.

Based on that evaluation, our management, including the Chief Executive Officer and Chief Financial Officer, concluded that as of July 4, 2015, the Company’s disclosure controls and procedures, as defined in Rule 13a-15(e) under the Exchange Act, were effective to provide reasonable assurance that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and to provide reasonable assurance that such information is accumulated and communicated to our management, including our principal executive officer, as appropriate to allow timely decisions regarding required disclosures.

Changes in Internal Control over Financial Reporting

There have been no changes in our internal controls over financial reporting during the six months ended July 4, 2015 that have materially affected or are reasonably likely to materially affect our internal control over financial reporting.

Inherent Limitations on Controls and Procedures

Our management, including the Chief Executive Officer and the Chief Financial Officer, does not expect that our disclosure controls and procedures and our internal controls will prevent all error and all fraud. A control system, no matter how well designed and operated, can only provide reasonable assurances that the objectives of the control system are met. The design of a control system reflects resource constraints; the benefits of controls must be considered relative to their costs. Because there are inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within the Company have been or will be detected. As these inherent limitations are known features of the financial reporting process, it is possible to design into the process safeguards to reduce, though not eliminate, these risks. These inherent limitations include the realities that judgments in decision-making can be faulty and that breakdowns occur because of simple error or mistake. Controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the control. The design of any system of controls is based in part upon certain assumptions about the likelihood of future events. While our disclosure controls and procedures are designed to provide reasonable assurance of achieving their objectives, there can be no assurance that any design will succeed in achieving its stated goals under all future conditions. Over time, controls may become inadequate because of changes in conditions or deterioration in the degree of compliance with the policies or procedures. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected.

We intend to review and evaluate the design and effectiveness of our disclosure controls and procedures on an ongoing basis and to improve our controls and procedures over time and to correct any deficiencies that we may discover in the future. While our Chief Executive Officer and Chief Financial Officer have concluded that, as of July 4, 2015, the design of our disclosure controls and procedures, as defined in Rule 13a-15(e) under the Exchange Act, was effective, future events affecting our business may cause us to significantly modify our disclosure controls and procedures.

29

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

From time to time we are involved in litigation arising out of claims in the normal course of business. Based on the information presently available, management believes that there are no claims or actions pending or threatened against us, the ultimate resolution of which will have a material effect on our financial position, liquidity or results of operations, although the results of litigation are inherently uncertain.

Purported Shareholder Class Action Lawsuit, filed January 2014

On January 24, 2014, we and three of our present and former officers were named as defendants in a putative shareholder class action entitled Cooper v. Thoratec Corp., Case No. 4:14-cv-00360, filed in the United States District Court for the Northern District of California. The action asserts violations of Section 10(b) of the Exchange Act, and Rule 10b-5 promulgated thereunder, as well as Section 20(a) of the Exchange Act. On April 21, 2014, the Court appointed Bradley Cooper as Lead Plaintiff. On June 20, 2014, Mr. Cooper filed an amended class action complaint (“Amended Complaint”), adding a former officer of the Company as a defendant. The Amended Complaint alleged that during proposed class period (April 29, 2010 to November 27, 2013, inclusive), Defendants made false or misleading statements in various SEC filings, press releases, earnings calls, and healthcare conferences regarding the Company’s business and outlook, focusing primarily on Defendants’ alleged failure to disclose that there was a purported, known increase in the rate of pump thrombosis for patients using the HeartMate II Left Ventricular Assist Device during the proposed class period. Plaintiff sought unspecified damages, among other relief. Defendants filed a motion to dismiss the Amended Complaint for failure to state a claim on August 19, 2014, which the Court granted in its entirety with leave to amend on November 26, 2014. Plaintiff filed a second amended complaint on January 20, 2015 (the “Second Amended Complaint”). In the Second Amended Complaint, Plaintiff amended the class period from May 11, 2011 to August 6, 2014, inclusive, dropped a former officer of the Company as a defendant, and added Plaintiff Todd Labak, who is intended to replace Mr. Cooper as the Lead Plaintiff because Mr. Cooper no longer has Thoratec stock purchases within the proposed class period, among other changes. On March 23, 2015, Defendants filed a motion to dismiss the Second Amended Complaint for failure to state a claim. The motion to dismiss is now fully briefed and the parties are awaiting a ruling by the Court.

Purported Shareholder Class Action Lawsuit, filed July 2015

On July 23, 2015, the Company and its directors were named as defendants in a purported class action shareholder lawsuit entitled Solak v. Grossman, which was filed in the Superior Court of California, County of Alameda in connection with our entrance into the Merger Agreement. The lawsuit generally alleges that the members of our Board of Directors breached their fiduciary duties in negotiating and approving the Merger Agreement, that the Merger Agreement undervalues the Company, that our stockholders will not receive adequate or fair value for their common stock in the Merger and that the terms of the Merger Agreement impose improper deal protection terms that preclude competing offers.

Plaintiffs seek, among other things, to declare that the action is properly maintainable as a class action and to enjoin the Company from consummating the proposed Merger in the manner provided for by the Merger Agreement. Plaintiffs further seek unspecified money damages, costs and attorneys’ and experts’ fees.

Although the results of litigation are inherently uncertain, based on the information currently available, we do not believe the ultimate resolution of the above named actions will have a material effect on our financial position, liquidity or results of operations.

ITEM 1A. RISK FACTORS

You should carefully consider the factors discussed in Part I, “Item 1A. Risk Factors” in our 2014 Annual Report on Form 10-K, which could materially affect our business, financial condition or future operating results. The risks described in our 2014 Annual Report on Form 10-K are not the only risks facing us. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial condition and/or operating results.  In addition to those factors and other information in this Form 10-Q, the following updates to the risk factors should be considered carefully while evaluating the Company and our business.

30

Risks Related to Our Pending Acquisition by St. Jude Medical

The announcement and pendency of our proposed acquisition by St. Jude Medical could have an adverse effect on our stock price, business, financial condition, results of operations or business prospects.

The announcement and pendency of the Merger could disrupt our business in the following ways, among others:

·our customers and other third-party business partners may determine to delay or defer purchase decisions with regards to our product or seek to terminate and/or renegotiate their relationships with us as a result of the Merger, whether pursuant to the terms of their existing agreements with us or otherwise;

·the attention of our management may be directed toward the completion of the Merger and related matters and may be diverted from the day-to-day business operations, including from other opportunities that might otherwise be beneficial to us; and

·current and prospective employees may experience uncertainty regarding their future roles with St. Jude Medical, which might adversely affect our ability to retain, recruit and motivate key personnel and may adversely affect the focus of our employees on sales of our product.

Should they occur, any of these matters could adversely affect our stock price or harm our financial condition, results of operations or business prospects.

Failure to complete the proposed acquisition by St. Jude Medical could negatively impact our business, financial condition, results of operations or stock price.

The completion of the Merger is subject to a number of conditions and there can be no assurance that the conditions to the completion of the Merger will be satisfied. The Merger Agreement may also be terminated by us and St. Jude Medical in certain specified circumstances, including, subject to compliance with the terms of the Merger Agreement, by us in order to accept a third-party acquisition proposal that our Board of Directors determines constitutes a superior offer upon payment of a termination fee to St. Jude Medical If the Merger is not completed, we will be subject to several risks, including:

·the current price of our common stock may reflect a market assumption that the Merger will occur, meaning that a failure to complete the Merger could result in a decline in the price of our common stock;

·we may be required to pay a termination fee to St. Jude Medical if the Merger Agreement is terminated under certain circumstances;

·we expect to incur substantial transaction costs in connection with the Merger whether or not the proposed acquisition is completed; and

·under the Merger Agreement, we are subject to certain restrictions on the conduct of our business prior to completing the Merger, which restrictions could adversely affect our ability to realize certain of our business strategies.

If the proposed acquisition by St. Jude Medical is not completed, these risks may materialize and materially and adversely affect our business, financial condition, results of operations or stock price.

31

ITEM 2. UNREGISTERED SALE OF EQUITY SECURITIES AND USE OF PROCEEDS

There were no unregistered sales of our equity securities during the three months ended July 4, 2015.

The following table sets forth certain information about our common stock repurchased during the three months ended July 4, 2015:

	Total number of shares purchased(1)	Average price paid per share		Total number of shares purchased as part of publicly announced plans or programs(2)	Approximate dollar value of shares that may yet be purchased under the plans or programs(2)
April 5, 2015 to April 30, 2015	59,735	$	41.13	57,196	$	74.4 million
May 1, 2015 to May 31, 2015	53,161	$	40.70	49,236	$	72.4 million
June 1, 2015 to July 4, 2015	14,091	$	44.69	7,059	$	72.1 million
Total	126,987	$	41.34	113,491	$	72.1 million

(1)Includes 13,496 shares purchased at an average price of $44.79 that were not part of our publicly announced repurchase programs for the three months ending July 4, 2015. These shares represent the surrender value of restricted stock units used to pay income taxes due upon vesting, and do not reduce the dollar value that may yet be purchased under our publicly announced repurchase programs.

(2)Cumulative amounts through each respective month of the quarter ended July 4, 2015.

On December 5, 2013, the Board of Directors authorized a new program to repurchase up to $200.0 million of our shares of common stock (“December 2013 program”), which will expire on December 31, 2015. In the three months ended July 4, 2015, we repurchased $4.6 million worth of shares of our common stock on the open market under the December 2013 program, of which $0.3 million was unsettled and accrued on our condensed consolidated balance sheet as of July 4, 2015. As of July 4, 2015, $72.1 million was available for repurchases of shares of our common stock under the December 2013 program. The December 2013 program may be accelerated, suspended, delayed or discontinued at any time.

ITEM 6. EXHIBITS

2.1	Agreement and Plan of Merger between St. Jude Medical Inc. and Thoratec Corporation dated July 21, 2015.(1)
10.1	Amended and Restated 2006 Incentive Plan.(2)
10.2	Amended and Restated 2002 Employee Stock Purchase Plan.(2)
3.1	Third Amended and Restated Bylaws of Thoratec Corporation, as amended and restated July 21, 2015.(1)
31.1	Section 302 Certification of Chief Executive Officer.
31.2	Section 302 Certification of Chief Financial Officer.
32.1*	Section 906 Certification of Chief Executive Officer.
32.2*	Section 906 Certification of Chief Financial Officer.
101	The following materials from Registrant’s Quarterly Report on Form 10-Q for the six months ended July 4, 2015, formatted in Extensible Business Reporting Language (XBRL) includes: (i) Unaudited Condensed Consolidated Balance Sheets as of July 4, 2015 and January 3, 2015, (ii) Unaudited Condensed Consolidated Statements of Operations for the Three and Six Months Ended July 4, 2015 and June 28, 2014, (iii) Unaudited Condensed Consolidated Statements of Comprehensive Income for the Three and Six Months Ended July 4, 2015 and June 28, 2014, (iv) Unaudited Condensed Consolidated Statements of Cash Flows for the Six Months Ended July 4, 2015 and June 28, 2014, and (v) Notes to Unaudited Condensed Consolidated Financial Statements.

*Furnished herewith.

(1)Filed as an Exhibit to Thoratec’s Form 8-K filed with the SEC on July 22, 2015, and incorporated by reference herein.

(2)Filed as an Appendix to Thoratec’s Definitive Proxy Statement filed with the SEC on March 24, 2015.

32

SIGNATURES

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

	THORATEC CORPORATION
Date: August 5, 2015	/s/ Taylor C. Harris
	Taylor C. Harris
	Chief Financial Officer and Principal Accounting Officer

33

EXHIBIT INDEX

2.1	Agreement and Plan of Merger between St. Jude Medical Inc. and Thoratec Corporation dated July 21, 2015.(1)
10.1	Amended and Restated 2006 Incentive Stock Plan.(2)
10.2	Amended and Restated 2002 Employee Stock Purchase Plan.(2)
3.1	Third Amended and Restated Bylaws of Thoratec Corporation, as amended and restated July 21, 2015.(1)
31.1	Section 302 Certification of Chief Executive Officer.
31.2	Section 302 Certification of Chief Financial Officer.
32.1*	Section 906 Certification of Chief Executive Officer.
32.2*	Section 906 Certification of Chief Financial Officer.
101	The following materials from Registrant’s Quarterly Report on Form 10-Q for the six months ended July 4, 2015, formatted in Extensible Business Reporting Language (XBRL) includes: (i) Unaudited Condensed Consolidated Balance Sheets as of July 4, 2015 and January 3, 2015, (ii) Unaudited Condensed Consolidated Statements of Operations for the Three and Six Months Ended July 4, 2015 and June 28, 2014, (iii) Unaudited Condensed Consolidated Statements of Comprehensive Income for the Three and Six Months Ended July 4, 2015 and June 28, 2014, (iv) Unaudited Condensed Consolidated Statements of Cash Flows for the Six Months Ended July 4, 2015 and June 28, 2014, and (v) Notes to Unaudited Condensed Consolidated Financial Statements.

*Furnished herewith.

(1)Filed as an Exhibit to Thoratec’s Form 8-K filed with the SEC on July 22, 2015, and incorporated by reference herein.

(2)Filed as an Appendix to Thoratec’s Definitive Proxy Statement filed with the SEC on March 24, 2015.

34

EX-31.1

EXHIBIT 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO EXCHANGE ACT RULES13a-14(a) and 15d-14(a),

AS ADOPTED PURSUANT TO SECTION 302 OF

THE SARBANES-OXLEY ACT OF 2002

I, D. Keith Grossman, certify that:

1. I have reviewed this report on Form 10-Q of Thoratec Corporation;

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 condensed 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/ D. Keith Grossman

D. Keith Grossman

Chief Executive Officer

August 5, 2015

EX-31.2

EXHIBIT 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO EXCHANGE ACT RULES 13a-14(a) and 15d-14(a),

AS ADOPTED PURSUANT TO SECTION 302 OF

THE SARBANES-OXLEY ACT OF 2002

I, Taylor C. Harris, certify that:

1. I have reviewed this report on Form 10-Q of Thoratec Corporation;

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 condensed 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/ Taylor C. Harris

Taylor C. Harris

Chief Financial Officer

August 5, 2015

EX-32.1

EXHIBIT 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER
PURSUANT TO 18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO SECTION 906
OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q for the fiscal quarter ended July 4, 2015 of Thoratec Corporation (the “Company”) as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, D. Keith Grossman, Chief Executive 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:

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/ D. Keith Grossman

D. Keith Grossman

Chief Executive Officer

Date: August 5, 2015

A signed original of this written statement required by Section 906 has been provided to Thoratec Corporation and will be retained by Thoratec and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

EXHIBIT 32.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER
PURSUANT TO 18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO SECTION 906
OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q for the fiscal quarter ended July 4, 2015 of Thoratec Corporation (the “Company”) as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Taylor C. Harris, 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:

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/ Taylor C. Harris

Taylor C. Harris

Chief Financial Officer

Date: August 5, 2015

A signed original of this written statement required by Section 906 has been provided to Thoratec Corporation and will be retained by Thoratec and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Balance Sheet and Statement of Operations Information (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014	Jan. 03, 2015
Changes in the warranty provision
Balance, beginning of the fiscal year			$ 10,639	$ 9,899
Additions			2,480	1,710
Change in estimate			614
Settlements			(5,085)	(2,258)
Balance, end of the period	$ 8,648	$ 9,351	8,648	9,351
Changes in accumulated other comprehensive loss
Balance at the beginning of the period			(22,022)
Other comprehensive loss before reclassification			4,122
Total other comprehensive income (loss)	1,385	(777)	4,122	(729)
Balance at the end of the period	$ (17,900)		$ (17,900)
Other accrued liabilities
Minimum percentage of other accrued liabilities to total current liabilities	5.00%		5.00%
Deferred revenue	$ 7,066		$ 7,066		$ 5,063
Interest Income and other
Interest income	177	201	325	425
Foreign currency, net	340	(130)	560	(187)
Other	170	488	619	568
Total interest income and other	687	$ 559	1,504	$ 806
Foreign currency items
Changes in accumulated other comprehensive loss
Balance at the beginning of the period			(20,781)
Other comprehensive loss before reclassification			4,396
Total other comprehensive income (loss)			4,396
Balance at the end of the period	(16,385)		(16,385)
Unrealized gain (loss) on available-for-sale securities
Changes in accumulated other comprehensive loss
Balance at the beginning of the period			(1,241)
Other comprehensive loss before reclassification			(274)
Total other comprehensive income (loss)			(274)
Balance at the end of the period	$ (1,515)		$ (1,515)

XML

Segment and Geographic Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015 USD ($)	Jun. 28, 2014 USD ($)	Jul. 04, 2015 USD ($) segment	Jun. 28, 2014 USD ($)
Segment and Geographic Information
Number of operating and reporting segment | segment			1
Segment information
Product sales	$ 128,692	$ 118,063	$ 250,000	$ 243,760
HeartMate
Segment information
Product sales	113,684	101,975	218,740	211,986
CentriMag
Segment information
Product sales	13,373	13,111	27,215	26,105
PVAD and IVAD
Segment information
Product sales	815	2,497	2,546	4,749
Other
Segment information
Product sales	820	480	1,499	920
Pump
Segment information
Product sales	93,042	81,583	179,938	170,883
Non-Pump
Segment information
Product sales	34,830	36,000	68,563	71,957
Other
Segment information
Product sales	820	480	1,499	920
Domestic (i.e. United States)
Segment information
Product sales	104,293	94,172	200,386	189,777
International
Segment information
Product sales	$ 24,399	$ 23,891	$ 49,614	$ 53,983

XML

Common and Preferred Stock (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 04, 2015	Jul. 04, 2015	Jan. 03, 2015	Dec. 05, 2013
Common and Preferred Stock
Unsettled and accrued liability	$ 22,391	$ 22,391	$ 20,441
Aggregate amount of common stock agreed to be repurchased		6,000
Decrease in additional-paid-in-capital		1,900
Decrease in retained earnings		4,100
December 2013 program
Common and Preferred Stock
Maximum amount for repurchase of common stock				$ 200,000
Repurchases of shares of our common stock under stock repurchase programs	4,600	22,900
Unsettled and accrued liability	300	300
Repurchased shares of common stock accrued on the consolidated balance sheet	72,100	72,100
Repurchases of shares of our common stock under stock repurchase programs	$ 22,900	22,900
Decrease in additional-paid-in-capital		8,000
Decrease in retained earnings		$ 14,900

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Fair Value Measurements (Details 2) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 04, 2015	Jan. 03, 2015
Available-for-sale investments by major security type:
Total Amortized Cost	$ 133,945
Other long-term assets - investments - deferred compensation plan
Deferred compensation plan assets	6,400	$ 6,000
Contractual maturities of available-for-sale investments, Amortized Cost
Total Amortized Cost	133,945
Contractual maturities of available-for-sale investments, Fair Value
Total Fair Value	133,254
Short-term investments
Available-for-sale investments by major security type:
Total Amortized Cost	129,045	157,622
Gross Unrealized Gains	49	84
Gross Unrealized Losses	(52)	(42)
Fair Value	129,042	157,664
Contractual maturities of available-for-sale investments, Amortized Cost
Maturing within 1 year	80,742
Maturing after 1 year through 5 years	48,303
Total Amortized Cost	129,045	157,622
Maturing after 5 years	4,900
Contractual maturities of available-for-sale investments, Fair Value
Maturing within 1 year	80,746
Maturing after 1 year through 5 years	48,296
Total Fair Value	129,042
Maturing after 5 years	4,212
Municipal bonds
Available-for-sale investments by major security type:
Total Amortized Cost	86,339	117,614
Gross Unrealized Gains	49	83
Gross Unrealized Losses	(30)	(16)
Fair Value	86,358	117,681
Contractual maturities of available-for-sale investments, Amortized Cost
Total Amortized Cost	86,339	117,614
U.S. government agency securities
Available-for-sale investments by major security type:
Total Amortized Cost	6,901	8,341
Gross Unrealized Losses	(1)	(1)
Fair Value	6,900	8,340
Contractual maturities of available-for-sale investments, Amortized Cost
Total Amortized Cost	6,901	8,341
Corporate bonds
Available-for-sale investments by major security type:
Total Amortized Cost	22,440	19,655
Gross Unrealized Gains		1
Gross Unrealized Losses	(21)	(24)
Fair Value	22,419	19,632
Contractual maturities of available-for-sale investments, Amortized Cost
Total Amortized Cost	22,440	19,655
Commercial Paper
Available-for-sale investments by major security type:
Total Amortized Cost	12,792	10,297
Fair Value	12,792	10,297
Contractual maturities of available-for-sale investments, Amortized Cost
Total Amortized Cost	12,792	10,297
Asset-backed securities
Available-for-sale investments by major security type:
Total Amortized Cost	573	1,715
Gross Unrealized Losses		(1)
Fair Value	573	1,714
Contractual maturities of available-for-sale investments, Amortized Cost
Total Amortized Cost	573	1,715
Long-term investments
Available-for-sale investments by major security type:
Total Amortized Cost	7,896	7,896
Gross Unrealized Losses	(2,233)	(1,821)
Fair Value	5,663	6,075
Contractual maturities of available-for-sale investments, Amortized Cost
Total Amortized Cost	7,896	7,896
Auction rate securities
Available-for-sale investments by major security type:
Total Amortized Cost	4,900	4,900
Gross Unrealized Losses	(688)	(661)
Fair Value	4,212	4,239
Contractual maturities of available-for-sale investments, Amortized Cost
Total Amortized Cost	4,900	4,900
Marketable equity securities
Available-for-sale investments by major security type:
Total Amortized Cost	2,996	2,996
Gross Unrealized Losses	(1,545)	(1,160)
Fair Value	1,451	1,836
Contractual maturities of available-for-sale investments, Amortized Cost
Total Amortized Cost	$ 2,996	$ 2,996

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Foreign Exchange Instruments (Tables)

6 Months Ended

Jul. 04, 2015

Foreign Exchange Instruments

Schedule of notional amount of foreign currency contracts, which do not qualify for hedge accounting

	July 4, 2015		January 3, 2015
Forward contracts:
Euro (sell)	€	11.4 million	€	15.8 million
British Pound Sterling (sell)	£	1.3 million	£	1.5 million
U.S. Dollar (sell)	$	40.8 million	$	21.2 million
U.S. Dollar (buy)	$	76.8 million	$	59.0 million

Schedule of derivative instruments measured at gross fair value reported on the consolidated balance sheets

	As of July 4, 2015				As of January 3, 2015
	Prepaid expenses and other assets		Other accrued liabilities		Prepaid expenses and other assets		Other accrued liabilities
	(in thousands)
Derivatives not designated as hedging instruments (forward contracts)	$	188	$	611	$	3,759	$	913

Schedule of effect of derivative instruments not designated as hedging instruments and foreign currency transactions gains and losses

	Three Months Ended						Six Months Ended
	July 4, 2015			June 28, 2014			July 4, 2015			June 28, 2014
	(in thousands)
Foreign currency exchange gain (loss) on foreign contracts	$	(1,547	)	$	(420	)	$	7,943		$	(67	)
Foreign currency transactions gain (loss)	1,887			291			(7,383		)	(119		)

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Subsequent Event (Details) - Jul. 21, 2015 - Subsequent events - Merger Sub - USD ($) $ / shares in Units, $ in Millions	Total
Subsequent Event
Share price as payable consideration (in dollars per share)	$ 63.50
Number of days in go-shop period	30 days
Events occurring during Go-shop Period
Subsequent Event
Termination costs	$ 30
Events occurring after the Go-shop period
Subsequent Event
Termination costs	$ 111

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Legal Proceeding (Details)	Jan. 24, 2014 item
Legal Proceeding
Number of present and former officers named as defendants in a complaint filed in the United States District Court	3

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Foreign Exchange Instruments (Details) $ in Thousands, € in Millions, £ in Millions	3 Months Ended		6 Months Ended
	Jul. 04, 2015 USD ($)	Jun. 28, 2014 USD ($)	Jul. 04, 2015 USD ($)	Jun. 28, 2014 USD ($)	Jul. 04, 2015 GBP (£)	Jul. 04, 2015 EUR (€)	Jul. 04, 2015 USD ($)	Jan. 03, 2015 GBP (£)	Jan. 03, 2015 EUR (€)	Jan. 03, 2015 USD ($)
Foreign currency forward exchange details
Foreign currency exchange gain (loss) on foreign contracts	$ (1,547)	$ (420)	$ 7,943	$ (67)
Foreign currency transactions gain (loss)	$ 1,887	$ 291	$ (7,383)	$ (119)
Prepaid expenses and other assets
Foreign currency forward exchange details
Gross fair value of Derivatives not designated as hedging instruments (forward contracts)							$ 188			$ 3,759
Other accrued liabilities
Foreign currency forward exchange details
Gross fair value of Derivatives not designated as hedging instruments (forward contracts)							611			913
Not Designated | Maximum
Foreign currency forward exchange details
Approximate period forward contracts			3 months
Foreign Currency Derivatives, Hedge Term			3 months
Not Designated | Euro (sell)
Foreign currency forward exchange details
Gross notional amounts for outstanding derivatives | €						€ 11.4			€ 15.8
Not Designated | British Pound Sterling (sell)
Foreign currency forward exchange details
Gross notional amounts for outstanding derivatives | £					£ 1.3			£ 1.5
Not Designated | U.S. Dollar (sell)
Foreign currency forward exchange details
Gross notional amounts for outstanding derivatives							40,800			21,200
Not Designated | U.S. Dollar (buy) 1
Foreign currency forward exchange details
Gross notional amounts for outstanding derivatives							$ 76,800			$ 59,000

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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jul. 04, 2015	Apr. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Income Taxes
Income tax expense out of period adjustment		$ 2.3
Effective Income Tax Rate Reconciliation, Percent	30.40%		32.50%	36.40%	32.60%
Reasonably possible potential reduction in unrecognized tax benefits over the next 12 months	$ 1.5			$ 1.5

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Acquisitions

6 Months Ended

Jul. 04, 2015

Acquisitions

Acquisitions

Note 2. Acquisitions

We have accounted for our acquisitions as business combinations. In accordance with authoritative guidance on business combination accounting, the assets and liabilities of the acquired companies were recorded as of the acquisition date, at their respective fair values, and are consolidated within our condensed consolidated financial statements. The results of operations related to each company acquired have been included in our condensed consolidated statements of operations since the date each company was acquired. All acquisition-related costs are expensed and recorded in selling, general and administrative expenses in our condensed consolidated statement of operations for the periods presented.

Apica Acquisition in 2014

On July 2, 2014, we acquired all of the outstanding equity interests of Apica Cardiovascular Limited (“Apica”) and certain related subsidiaries from the former stockholders of Apica (the “Apica Acquisition”). Under the terms of the Apica Acquisition, the initial purchase consideration was approximately $35.1 million (net of acquired cash and inclusive of the settlement of existing debt and Apica’s direct acquisition-related transaction costs), and we will be obligated to make potential future milestone payments, based on regulatory approvals and commercial sales, of up to $40.0 million. Total purchase price allocation was estimated at $60.8 million at the acquisition date, including the initial purchase consideration of approximately $35.1 million and the estimated fair values for contingent consideration totaling $25.7 million, which was recorded as a non-current liability because such contingent consideration is expected to be settled no earlier than the third quarter of 2016. Prior to the acquisition, Apica was developing a surgical implantation system (“SIS”) to improve the apical access and attachment of the Left Ventricular Assist Device (“LVAD”) to the apex of the heart. We plan to couple the SIS with our HeartMate product line with the intention to obtain regional regulatory approvals for commercialization. In addition, Apica had developed the apical access, stabilization, and closure (“ASC”) device, which is commercially sold in Europe and is used for transapical valve procedures. We incurred $2.3 million of acquisition-related costs in connection with the Apica Acquisition in 2014.

The purchase price allocation as of the acquisition date (as adjusted) is summarized as follows (in thousands):

Current assets (excluding cash)	$	548
Identifiable intangible assets:
Developed technology (ASC)	5,300
IPR&D asset (SIS)	26,500
Goodwill	31,491
Total assets	63,839
Less: Liabilities assumed	463
Deferred tax liability	2,562
Total estimated purchase price consideration	60,814
Less: Contingent consideration	25,700
Cash paid or payable at the acquisition closing	$	35,114

We recorded an IPR&D asset of $26.5 million, which represents an estimate of the fair value of the in-process technology related to the SIS device. The fair value of the IPR&D asset was determined using the multi-period excess earnings method which is equal to the present value of the incremental after-tax cash flows attributable to that intangible asset, using a discount rate of 23% based on our best estimate of a market participant’s after-tax weighted average cost of capital. We also recorded an ASC intangible asset of $5.3 million, which represents the estimated fair value of the technology associated with the ASC device. The fair value of the ASC intangible asset was determined using the replacement cost method, which represents what a market participant’s estimated cost would be to obtain or develop the technology in its current state. The replacement cost method was utilized because of limited market opportunities associated with the ASC technology. In the fourth quarter of 2014, we discontinued the commercialization of the ASC device and impaired the unamortized net book value associated with the ASC intangible asset.

Goodwill is calculated as the difference between the acquisition date fair value of the consideration transferred and the fair values assigned to the assets acquired, liabilities assumed, and primarily represents the expected synergies of Apica with our technologies. The goodwill of $31.5 million was allocated to our sole operating segment (Cardiovascular group) and is not deductible for income tax purposes.

The following pro forma information presents the combined results of operations for the six months ended June 28, 2014 as if we had completed the Apica acquisition at the beginning of 2013. The pro forma financial information is provided for comparative purposes only and is not necessarily indicative of what actual results would have been had the acquisition occurred on the date indicated, nor does it give effect to synergies, cost savings, fair market value adjustments, immaterial depreciation expense and other changes expected to result from the acquisition. Accordingly, the pro forma financial results do not purport to be indicative of condensed consolidated results of operations as of the date hereof, for any period ended on the date hereof, or for any other future date or period.

	Six months Ended June 28, 2014
Product sales	$	243,760
Income before taxes	49,793
Net income	33,579

Contingent Consideration

Our acquisition of Apica includes payments of future contingent consideration upon the achievement of certain regulatory approvals and commercial sales milestones. We determined the initial fair value of the contingent consideration in connection with the regulatory and commercial sales milestones using various estimates, including probabilities of success, discount rates and the estimated amount of time until the conditions of the milestone payments are met. This fair value measurement was based on significant inputs not observable in the market, representing a Level 3 measurement within the fair value hierarchy (see Note 3 for more information about fair value measurements). The key assumptions used to determine the fair value of the contingent consideration associated with the regulatory milestones at the acquisition dates included a discount rate and probability-adjusted milestone payment date ranges. The key assumptions used to determine the fair value of the contingent consideration associated with the commercial sales milestones at the acquisition dates included a discount rate and probability-weighted expected milestone payment date ranges based on the aggregate number of commercial units sold.

The fair value of recorded contingent consideration is re-measured at each reporting period with the change in fair value recognized within operating expense in our condensed consolidated statements of operations. We measure the liabilities on a recurring basis using Level 3 inputs. See Note 3 for further information regarding fair value measurements.

· In the first six months of 2015, the fair value of the Apica contingent consideration increased by $0.3 million, in which $0.31 million was reported as research and development (“R&D”) expense and ($0.01) million was reported as selling, general and administrative (“SG&A”) expense. The increase was primarily a result of accretion associated with the passage of time.

· We acquired certain assets and assumed certain liabilities from Terumo Corporation related to the DuraHeart II Left Ventricular Assist System product line (“DuraHeart II”) in June 2013. Under the terms of the DuraHeart II acquisition, the initial purchase consideration was $13.0 million and we will be obligated to make potential future milestone payments, based on regulatory approvals and product sales, of up to $43.5 million. In the first six months of 2015, the fair value of the DuraHeart II contingent consideration increased by $0.3 million (primarily reported as SG&A expense) as a result of a change in the discount rate and accretion associated with the passage of time. In the first six months of 2014, the fair value decreased by $3.2 million ($2.2 million reported as a reduction to R&D expense and $1.0 million reported as a reduction to SG&A expense) as a result of the changes in the probabilities of success and timing of when milestones were expected to be met.

· Our acquisition of the medical business of Levitronix LLC (“Levitronix Medical”) in August 2011 requires payments of future contingent consideration annually through August 2015, which is calculated as 36% of annual revenues above agreed upon revenue targets. In the first six months of 2015 and 2014, we paid $9.4 million and $7.0 million, respectively, related to the Levitronix Medical contingent consideration. In the first six months of 2015 and 2014, we recorded a re-measurement adjustment (increase) of $0.2 million and $1.7 million, respectively, which was reported as SG&A expense.

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Share-Based Compensation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014	Jan. 03, 2015
Share-based compensation
Share-based compensation cost	$ 9,453	$ 7,833	$ 18,850	$ 14,615
Tax benefit for share-based compensation expense	3,141	2,731	6,101	5,003
Total share-based compensation (net of taxes)	$ 6,312	$ 5,102	$ 12,749	$ 9,612
Options
Share-based compensation
Remaining shares available for future issuance	3,200		3,200
Percentage of conversion target			100.00%
Method and assumptions on valuation of stock options
Risk free interest rate (weighted average)	1.50%	2.21%	1.52%	2.19%
Expected volatility (as a percent)	35.00%	35.00%	37.00%	37.00%
Expected option term (years)	5 years 7 months 6 days	5 years 10 months 17 days
Dividends (as a percent)	0.00%	0.00%	0.00%	0.00%
Number of options
Outstanding options at the beginning of the period (in shares)			2,737
Granted (in shares)			211
Exercised (in shares)			(802)
Forfeited or expired (in shares)			(62)
Outstanding options at the end of the period (in shares)	2,084		2,084		2,737
Outstanding options exercisable at the end of the period (in shares)	933		933
Outstanding options vested and expected to vest	1,992		1,992
Stock options, Weighted-Average Exercise Price Per Share
Outstanding options at the beginning of the period (in dollars per share)			$ 31.04
Granted (in dollars per share)			41.22
Exercised (in dollars per share)			29.25
Forfeited or expired (in dollars per share)			35.83
Outstanding options at the end of the period (in dollars per share)	$ 32.61		32.61		$ 31.04
Outstanding options exercisable at the end of the period (in dollars per share)	29.82		29.82
Outstanding options vested as of July 4, 2015 and expected	$ 32.48		$ 32.48
Weighted Average Remaining Contract Life (years)
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2			7 years 3 months 22 days		6 years 11 months 12 days
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2			7 years 3 months 22 days		6 years 11 months 12 days
Outstanding options exercisable			5 years 9 months 7 days
Outstanding options vested or expected			7 years 2 months 27 days
Unrecognized compensation expenses, net of estimated forfeitures	$ 8,300		$ 8,300
Weighted average period for unrecognized compensation cost expected to be recognized			1 year 7 months 2 days
Weighted average grant-date fair value (in dollars per share)			$ 14.22
Options | Minimum
Method and assumptions on valuation of stock options
Expected option term (years)			5 years 1 month 21 days	4 years 6 months 15 days
Options | Maximum
Method and assumptions on valuation of stock options
Expected option term (years)			5 years 9 months 26 days	5 years 15 days
Cost of product sales
Share-based compensation
Share-based compensation cost	675	$ 756	$ 1,458	$ 1,377
Selling, general and administrative expenses
Share-based compensation
Share-based compensation cost	6,198	4,794	12,855	8,819
Research and development
Share-based compensation
Share-based compensation cost	$ 2,580	$ 2,283	$ 4,537	$ 4,419

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Segment and Geographic Information (Tables)

6 Months Ended

Jul. 04, 2015

Segment and Geographic Information

Schedule of product sales by geographic location

	Three Months Ended				Six Months Ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
	(in thousands)
Product sales by geographic location:
Domestic	$	104,293	$	94,172	$	200,386	$	189,777
International	24,399		23,891		49,614		53,983
Total	$	128,692	$	118,063	$	250,000	$	243,760

Schedule of product sales by product line

	Three Months Ended				Six Months Ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
	(in thousands)
Product sales by product line:
HeartMate	$	113,684	$	101,975	$	218,740	$	211,986
CentriMag	13,373		13,111		27,215		26,105
PVAD and IVAD	815		2,497		2,546		4,749
Other	820		480		1,499		920
Total	$	128,692	$	118,063	$	250,000	$	243,760

Schedule of product sales by category

	Three Months Ended				Six Months Ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
	(in thousands)
Product sales by category:
Pump	$	93,042	$	81,583	$	179,938	$	170,883
Non-Pump	34,830		36,000		68,563		71,957
Other	820		480		1,499		920
Total	$	128,692	$	118,063	$	250,000	$	243,760

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Share-Based Compensation (Tables)

6 Months Ended

Jul. 04, 2015

Share-Based Compensation

Schedule of share-based compensation

	Three Months Ended				Six Months Ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
	(in thousands)
Cost of product sales	$	675	$	756	$	1,458	$	1,377
Selling, general and administrative expenses	6,198		4,794		12,855		8,819
Research and development	2,580		2,283		4,537		4,419
Total share-based compensation expense before taxes	9,453		7,833		18,850		14,615
Tax benefit for share-based compensation expense	3,141		2,731		6,101		5,003
Total share-based compensation (net of taxes)	$	6,312	$	5,102	$	12,749	$	9,612

Schedule of assumptions used to estimate the grant date fair value of options

	Three Months Ended				Six Months Ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
Risk free interest rate (weighted average)	1.50	%	2.21	%	1.52	%	2.19	%
Expected volatility	35	%	35	%	37	%	37	%
Expected option term (years)	5.60		5.88		5.14 to 5.82		4.54 to 5.04
Dividends	None		None		None		None

Summary of stock option activity

	Number of Options (in thousands)		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contract Life (years)
Outstanding options as of January 3, 2015	2,737		$	31.04	6.95
Granted	211		41.22
Exercised	(802	)	29.25
Forfeited or expired	(62	)	35.83
Outstanding options as of July 4, 2015	2,084		32.61		7.31
Outstanding options exercisable as of July 4, 2015	933		29.82		5.77
Outstanding options vested as of July 4, 2015 and expected to vest	1,992		$	32.48	7.24

Summary of restricted stock unit activity

	Number of Units (in thousands)		Weighted Average Grant-Date Fair Value		Weighted Average Remaining Contract Life (in years)
Outstanding units as of January 3, 2015	1,573		$	33.31	1.36
Granted	654		41.06
Released	(500	)	33.33
Forfeited or expired	(127	)	34.82
Outstanding units as of July 4, 2015	1,600		$	36.35	1.68

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Share-Based Compensation (Details 2) - Restricted stock units - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	6 Months Ended	12 Months Ended
	Jul. 04, 2015	Jan. 03, 2015
Number of units
Outstanding unvested restricted stock at the beginning of the period (in shares)	1,573
Granted (in shares)	654
Released (in shares)	(500)
Forfeited or expired (in shares)	(127)
Outstanding unvested restricted stock at the end of the period (in shares)	1,600	1,573
Weighted Average Grant-Date fair Value
Outstanding unvested restricted stock at the beginning of the year (in dollars per share)	$ 33.31
Granted (in dollars per share)	41.06
Released (in dollars per share)	33.33
Forfeited or expired (in dollars per share)	34.82
Outstanding unvested restricted stock at the end of the year (in dollars per share)	$ 36.35	$ 33.31
Weighted Average Remaining Contract Life (in years)
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms	1 year 8 months 5 days	1 year 4 months 10 days
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms	1 year 8 months 5 days	1 year 4 months 10 days
Unrecognized compensation expenses, net of estimated forfeitures	$ 48.8
Weighted average period for unrecognized compensation cost expected to be recognized	2 years 8 months 27 days

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Net Income Per Share (Tables)

6 Months Ended

Jul. 04, 2015

Net Income Per Share

Schedule of Basic and diluted income per common share attributable to common shareholders under the two-class method

	Three Months Ended				Six Months Ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
	(in thousands, except per share data)
Numerator:
Net Income	$	13,248	$	17,413	$	24,028	$	35,652
Denominator:
Weighted average shares used to compute basic EPS	54,481		56,723		54,246		56,781
Dilutive effect of share-based compensation plans	780		465		909		757
Weighted average shares used to compute diluted EPS	55,261		57,188		55,155		57,538
Net income per share:
Basic	$	0.24	$	0.31	$	0.44	$	0.63
Diluted	$	0.24	$	0.30	$	0.44	$	0.62

Schedule of potential common share equivalents excluded where the inclusion would be anti-dilutive

	Three Months Ended		Six Months Ended
	July 4, 2015	June 28, 2014	July 4, 2015	June 28, 2014
	(in thousands)
Options to purchase shares not included in the computation of diluted net income per share because their inclusion would be anti-dilutive	184	461	257	749

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Acquisitions (Details) - USD ($) $ in Thousands		1 Months Ended		6 Months Ended
	Jul. 02, 2014	Jun. 29, 2013	Aug. 27, 2011	Jul. 04, 2015	Jun. 28, 2014	Jan. 03, 2015
Summary of purchase price allocation
Goodwill				$ 226,578		$ 225,293
Pro forma financial information
Increase( decrease ) in fair value of contingent consideration				818	$ (1,436)
Apica Acquisition
Acquisition
Cash paid	$ 35,100
Acquisition-related costs	2,300
Summary of purchase price allocation
Current assets (excluding cash)	548
Goodwill	31,491
Total assets	63,839
Less: Liabilities assumed	463
Deferred tax liability	2,562
Total estimated purchase price consideration	60,814
Less: Contingent consideration	25,700
Cash paid or payable at the acquisition closing	$ 35,114
Discount rate (as a percent)	23.00%
Pro forma financial information
Product sales					243,760
Income before taxes					49,793
Net income					33,579
Increase( decrease ) in fair value of contingent consideration				300
Apica Acquisition | Research and development
Pro forma financial information
Increase( decrease ) in fair value of contingent consideration				310
Apica Acquisition | Selling, general and administrative expenses
Pro forma financial information
Increase( decrease ) in fair value of contingent consideration				(10)
Apica Acquisition | IPR&D asset
Summary of purchase price allocation
Identifiable intangible assets	$ 26,500
Apica Acquisition | Developed technology
Summary of purchase price allocation
Finite-lived identifiable intangible assets	5,300
Apica Acquisition | Contingent consideration payable upon reaching commercial sales milestone
Acquisition
Potential future milestone payments	$ 40,000
DuraHeart II Acquisition
Acquisition
Cash paid		$ 13,000
Potential future milestone payments		$ 43,500
Pro forma financial information
Increase( decrease ) in fair value of contingent consideration				300	(3,200)
DuraHeart II Acquisition | Research and development
Pro forma financial information
Increase( decrease ) in fair value of contingent consideration					(2,200)
DuraHeart II Acquisition | Selling, general and administrative expenses
Pro forma financial information
Increase( decrease ) in fair value of contingent consideration					(1,000)
Levitronix Medical
Pro forma financial information
Percentage of sales above threshold for earn-out payments			36.00%
Contingent Consideration paid				9,400	7,000
Levitronix Medical | Selling, general and administrative expenses
Pro forma financial information
Increase( decrease ) in fair value of contingent consideration				$ 200	$ 1,700

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Operations and Significant Accounting Policies

6 Months Ended

Jul. 04, 2015

Operations and Significant Accounting Policies

Operations and Significant Accounting Policies

Note 1. Operations and Significant Accounting Policies

Basis of Presentation

The interim unaudited condensed consolidated financial statements of Thoratec Corporation (“we,” “our,” “us,” or the “Company”) have been prepared and presented in accordance with accounting principles generally accepted in the U.S. (“GAAP”) and the rules and regulations of the Securities and Exchange Commission (“SEC”), without audit, and reflect all adjustments necessary (consisting only of normal recurring adjustments) to present fairly our financial position, results of operations and cash flows as of and for the periods presented. Certain information and footnote disclosures normally included in our annual financial statements, prepared in accordance with GAAP, have been condensed or omitted. The accompanying financial statements should be read in conjunction with our consolidated financial statements, and the accompanying notes thereto, filed with the SEC in our Annual Report on Form 10-K for the fiscal year ended January 3, 2015 (the “2014 Annual Report”). The operating results for any interim period are not necessarily indicative of the results that may be expected for any future period.

The preparation of our unaudited condensed consolidated financial statements necessarily requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities on the unaudited condensed consolidated balance sheet dates and the reported amounts of revenues and expenses for the periods presented. Significant items subject to management’s estimates include revenue recognition, the useful lives of property and equipment, allowance for doubtful accounts, valuation allowance for deferred tax assets, stock-based compensation, income tax uncertainties, valuation of goodwill and intangible assets, warranty accrual and contingent consideration. The actual amounts could differ from those estimated amounts.

Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606), which provides guidance for revenue recognition. This ASU affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of non-financial assets. The guidance in this ASU supersedes the revenue recognition requirements in Topic 605, Revenue Recognition, and most industry-specific guidance. This ASU also supersedes some cost guidance included in Subtopic 605-35, Revenue Recognition-Construction-Type and Production-Type Contracts. On July 9, 2015, FASB voted to defer the effective date of this standard by one year to December 15, 2017. This standard will be effective for the Company starting in the fiscal year 2018. We are currently evaluating the impact of the adoption of this ASU on our condensed consolidated financial statements.

In February 2015, the FASB issued ASU No. 2015-02, Amendments to the Consolidation Analysis. The new standard amends the guidelines for determining whether certain legal entities should be consolidated and reduces the number of consolidation models. The new standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. We are currently evaluating the impact, if any, of adopting this new accounting guidance on our condensed consolidated financial statements.

In July 2015, the FASB issued ASU No. 2015-11, Simplifying the Measurement of Inventory. The new standard amends the guidelines for the measurement of inventory from lower of cost or market to the lower of cost and net realizable value (NRV). NRV is defined as the estimated selling prices in the ordinary course of business less reasonably predictable costs of completion, disposal, and transportation. Under existing standards, inventory is measured at lower of cost or market, which requires the consideration of replacement cost, NRV, and NRV less an amount that approximates a normal profit margin. This ASU eliminates the requirement to determine and consider replacement cost or NRV less an approximately normal profit margin for inventory measurement. The new standard is effective prospectively beginning January 1, 2017, with early adoption permitted. We are currently evaluating the impact, if any, of adopting this new accounting guidance on our condensed consolidated financial statements.

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Fair Value Measurements (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jan. 03, 2015
Financial assets and liabilities measured at fair value on a recurring basis
Transfers between the levels within the fair value hierarchy	$ 0	$ 0
Liabilities:
Cash flow model discount period	5 years
Commercial Paper
Assets:
Investments	$ 12,792		$ 10,297
Corporate bonds
Assets:
Investments	22,419		19,632
Municipal bonds
Assets:
Investments	86,358		117,681
U.S. government agency securities
Assets:
Investments	6,900		8,340
Asset-backed securities
Assets:
Investments	573		1,714
Auction rate securities
Assets:
Investments	4,212		4,239
Marketable equity securities
Assets:
Investments	1,451		1,836
Recurring basis | Total fair value
Assets:
Prepaid expenses and other assets - Foreign exchange contracts	188		3,759
Other long term assets: Investments included in our deferred compensation plan	1,870		1,552
Liabilities:
Other accrued liabilities - Foreign exchange contracts	611		913
Contingent consideration (current and long-term portions)	38,019		46,558
Recurring basis | Total fair value | Money market funds
Assets:
Cash equivalents	131,198		34,742
Recurring basis | Total fair value | Commercial Paper
Assets:
Cash equivalents			5,000
Investments	12,792		10,297
Recurring basis | Total fair value | Corporate bonds
Assets:
Cash equivalents	2,006		1,006
Investments	22,419		19,632
Recurring basis | Total fair value | Municipal bonds
Assets:
Cash equivalents	3,063		2,691
Investments	86,358		117,681
Recurring basis | Total fair value | U.S. government agency securities
Assets:
Investments	6,900		8,340
Recurring basis | Total fair value | Asset-backed securities
Assets:
Investments	573		1,714
Recurring basis | Total fair value | Auction rate securities
Assets:
Investments	4,212		4,239
Recurring basis | Total fair value | Marketable equity securities
Assets:
Investments	1,451		1,836
Recurring basis | Quoted prices in active markets for identical assets (Level 1) | Money market funds
Assets:
Cash equivalents	131,198		34,742
Recurring basis | Quoted prices in active markets for identical assets (Level 1) | Marketable equity securities
Assets:
Investments	1,451		1,836
Recurring basis | Significant other observable inputs (Level 2)
Assets:
Prepaid expenses and other assets - Foreign exchange contracts	188		3,759
Other long term assets: Investments included in our deferred compensation plan	1,870		1,552
Liabilities:
Other accrued liabilities - Foreign exchange contracts	611		913
Recurring basis | Significant other observable inputs (Level 2) | Commercial Paper
Assets:
Cash equivalents			5,000
Investments	12,792		10,297
Recurring basis | Significant other observable inputs (Level 2) | Corporate bonds
Assets:
Cash equivalents	2,006		1,006
Investments	22,419		19,632
Recurring basis | Significant other observable inputs (Level 2) | Municipal bonds
Assets:
Cash equivalents	3,063		2,691
Investments	86,358		117,681
Recurring basis | Significant other observable inputs (Level 2) | U.S. government agency securities
Assets:
Investments	6,900		8,340
Recurring basis | Significant other observable inputs (Level 2) | Asset-backed securities
Assets:
Investments	573		1,714
Recurring basis | Significant unobservable inputs (Level 3)
Liabilities:
Contingent consideration (current and long-term portions)	38,019		46,558
Recurring basis | Significant unobservable inputs (Level 3) | Auction rate securities
Assets:
Investments	$ 4,212		$ 4,239

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Goodwill and Intangible Assets, net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014	Jan. 03, 2015
Changes in carrying amount of goodwill
Balance, beginning of the period			$ 225,293
Foreign currency translation impact			1,285
Balance, end of period	$ 226,578		226,578		$ 225,293
Intangible assets subject to amortization:
Accumulated amortization before adjustments	(154,899)		(154,899)		(152,254)
Accumulated impairment before adjustments	(54,721)		(54,721)		(54,721)
Foreign currency translation adjustments, gross	95		95		(411)
Foreign currency translation adjustments, net	95		95		(411)
Gross Carrying Amount	223,723		223,723		223,217
Accumulated Amortization	(154,899)		(154,899)		(152,254)
Total	14,103		14,103		16,242
Accumulated impairment after adjustments	(62,421)		(62,421)		(62,421)
Total purchased intangible assets, gross	257,633		257,633		259,163
Total purchased intangible assets, net	40,313		40,313		44,488
Foreign currency translation adjustments			(4,990)		(2,954)
Amortization expense related to identifiable intangible assets (subject to amortization)	1,200	$ 1,900	2,400	$ 3,800
Estimated amortization expense for the next five fiscal years and all years thereafter
Remainder of 2015	2,306		2,306
2016	3,392		3,392
2017	2,520		2,520
2018	2,106		2,106
2019	1,712		1,712
Thereafter	2,067		2,067
Total	14,103		14,103		16,242
IPR&D asset | Apica Acquisition
Intangible assets subject to amortization:
Gross carrying amount before adjustments	26,500		26,500		26,500
Net carrying amount before adjustments	26,500		26,500		26,500
IPR&D asset | DuraHeart II Acquisition
Intangible assets subject to amortization:
Gross carrying amount before adjustments	12,400		12,400		12,400
Accumulated impairment before adjustments	(7,700)		(7,700)		(7,700)
Net carrying amount before adjustments	4,700		4,700		4,700
Patents and trademarks
Intangible assets subject to amortization:
Gross carrying amount before adjustments	43,532		43,532		43,532
Accumulated amortization before adjustments	(36,782)		(36,782)		(36,095)
Net carrying amount before adjustments	6,750		6,750		7,437
Core technology
Intangible assets subject to amortization:
Gross carrying amount before adjustments	37,180		37,180		37,180
Accumulated amortization before adjustments	(24,063)		(24,063)		(23,854)
Accumulated impairment before adjustments	(12,642)		(12,642)		(12,642)
Net carrying amount before adjustments	475		475		684
Developed technology
Intangible assets subject to amortization:
Gross carrying amount before adjustments	133,373		133,373		133,373
Accumulated amortization before adjustments	(86,721)		(86,721)		(85,613)
Accumulated impairment before adjustments	(42,079)		(42,079)		(42,079)
Net carrying amount before adjustments	4,573		4,573		5,681
Customer based relationships and other
Intangible assets subject to amortization:
Gross carrying amount before adjustments	7,243		7,243		7,243
Accumulated amortization before adjustments	(6,046)		(6,046)		(5,569)
Net carrying amount before adjustments	1,197		1,197		1,674
Pre-existing license agreements
Intangible assets subject to amortization:
Gross carrying amount before adjustments	2,300		2,300		2,300
Accumulated amortization before adjustments	(1,287)		(1,287)		(1,123)
Net carrying amount before adjustments	$ 1,013		$ 1,013		$ 1,177

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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jul. 04, 2015	Jan. 03, 2015
Current assets:
Cash and cash equivalents	$ 144,925	$ 72,814
Short-term available-for-sale investments	129,042	157,664
Receivables, net of allowances of $1,892 in 2015 and $1,504 in 2014	79,915	72,847
Inventories	70,859	62,204
Deferred tax assets	15,782	15,727
Income tax receivable	14,476	10,778
Prepaid expenses and other assets	5,922	12,458
Total current assets	460,921	404,492
Property, plant and equipment, net	49,371	51,231
Goodwill	226,578	225,293
Purchased intangible assets, net	40,313	44,488
Long-term available-for-sale investments	4,212	4,239
Other long-term assets	35,787	34,240
Total Assets	817,182	763,983
Current liabilities:
Accounts payable	20,969	12,662
Accrued compensation	25,472	22,836
Warranty and related accrual	8,648	10,639
Contingent liabilities, current portion	5,782	14,902
Other accrued liabilities	22,391	20,441
Total current liabilities	83,262	81,480
Long-term deferred tax liability	4,376	3,592
Other long-term liabilities	17,079	14,458
Contingent liabilities, non-current portion (Notes 2)	32,237	31,656
Total Liabilities	$ 136,954	$ 131,186
Shareholders' equity:
Common shares: no par, authorized 100,000; issued and outstanding 54,741 in 2015 and 54,109 in 2014
Additional paid-in-capital	$ 652,793	$ 614,577
Retained earnings	45,335	40,242
Accumulated other comprehensive loss:	(17,900)	(22,022)
Total Shareholders' Equity	680,228	632,797
Total Liabilities and Shareholders' Equity	$ 817,182	$ 763,983

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Share-Based Compensation (Details 3) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended		12 Months Ended
	Sep. 22, 2014	Jul. 04, 2015	Apr. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014	Jan. 03, 2015
Share-Based Compensation
Share-based compensation cost		$ 9,453		$ 7,833	$ 18,850	$ 14,615
Performance share units
Share-Based Compensation
Shares of common stock issued							69,000
Granted (in shares)	188,000		115,000
Share-based compensation cost		1,300			$ 1,900
Number of shares issuable upon vesting					0
Change in estimate of shares					0
Unrecognized compensation expenses, net of estimated forfeitures		$ 9,900			$ 9,900
Weighted average period for unrecognized compensation cost expected to be recognized					2 years 26 days
Performance share units | Minimum
Share-Based Compensation
Percentage range of shares of common stock issued		0.00%			0.00%
Vesting period					3 years
Performance share units | Maximum
Share-Based Compensation
Percentage range of shares of common stock issued		200.00%			200.00%
Vesting period					4 years

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Unrealized gains (losses) on investments, taxes	$ (188)	$ (2)	$ (183)	$ (284)

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Fair Value Measurements (Details 4) - Auction rate securities - Discounted cash flow - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 04, 2015	Jan. 03, 2015
Quantitative information for Level 3 Fair Value Measurements Assets
Fair value Assets	$ 4,212	$ 4,239
Discount rate (as a percent)	1.64%	1.61%
Market credit spread (as a percent)	2.95%	2.83%
Liquidity factor (as a percent)	0.00%	0.00%

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Operations and Significant Accounting Policies (Policies)

6 Months Ended

Jul. 04, 2015

Operations and Significant Accounting Policies

Basis of Presentation

Basis of Presentation

The interim unaudited condensed consolidated financial statements of Thoratec Corporation (“we,” “our,” “us,” or the “Company”) have been prepared and presented in accordance with accounting principles generally accepted in the U.S. (“GAAP”) and the rules and regulations of the Securities and Exchange Commission (“SEC”), without audit, and reflect all adjustments necessary (consisting only of normal recurring adjustments) to present fairly our financial position, results of operations and cash flows as of and for the periods presented. Certain information and footnote disclosures normally included in our annual financial statements, prepared in accordance with GAAP, have been condensed or omitted. The accompanying financial statements should be read in conjunction with our consolidated financial statements, and the accompanying notes thereto, filed with the SEC in our Annual Report on Form 10-K for the fiscal year ended January 3, 2015 (the “2014 Annual Report”). The operating results for any interim period are not necessarily indicative of the results that may be expected for any future period.

The preparation of our unaudited condensed consolidated financial statements necessarily requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent liabilities on the unaudited condensed consolidated balance sheet dates and the reported amounts of revenues and expenses for the periods presented. Significant items subject to management’s estimates include revenue recognition, the useful lives of property and equipment, allowance for doubtful accounts, valuation allowance for deferred tax assets, stock-based compensation, income tax uncertainties, valuation of goodwill and intangible assets, warranty accrual and contingent consideration. The actual amounts could differ from those estimated amounts.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (Topic 606), which provides guidance for revenue recognition. This ASU affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of non-financial assets. The guidance in this ASU supersedes the revenue recognition requirements in Topic 605, Revenue Recognition, and most industry-specific guidance. This ASU also supersedes some cost guidance included in Subtopic 605-35, Revenue Recognition-Construction-Type and Production-Type Contracts. On July 9, 2015, FASB voted to defer the effective date of this standard by one year to December 15, 2017. This standard will be effective for the Company starting in the fiscal year 2018. We are currently evaluating the impact of the adoption of this ASU on our condensed consolidated financial statements.

In February 2015, the FASB issued ASU No. 2015-02, Amendments to the Consolidation Analysis. The new standard amends the guidelines for determining whether certain legal entities should be consolidated and reduces the number of consolidation models. The new standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. We are currently evaluating the impact, if any, of adopting this new accounting guidance on our condensed consolidated financial statements.

In July 2015, the FASB issued ASU No. 2015-11, Simplifying the Measurement of Inventory. The new standard amends the guidelines for the measurement of inventory from lower of cost or market to the lower of cost and net realizable value (NRV). NRV is defined as the estimated selling prices in the ordinary course of business less reasonably predictable costs of completion, disposal, and transportation. Under existing standards, inventory is measured at lower of cost or market, which requires the consideration of replacement cost, NRV, and NRV less an amount that approximates a normal profit margin. This ASU eliminates the requirement to determine and consider replacement cost or NRV less an approximately normal profit margin for inventory measurement. The new standard is effective prospectively beginning January 1, 2017, with early adoption permitted. We are currently evaluating the impact, if any, of adopting this new accounting guidance on our condensed consolidated financial statements.

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Fair Value Measurements (Details 5) - USD ($) $ in Thousands		6 Months Ended		12 Months Ended
	Jul. 02, 2014	Jul. 04, 2015	Jun. 28, 2014	Jan. 03, 2015
Quantitative information for Level 3 Fair Value Measurements Liabilities
Impairment charge related to intangible assets		$ 0	$ 0
Apica Acquisition
Quantitative information for Level 3 Fair Value Measurements Liabilities
Discount rate (as a percent)	23.00%
Multiple outcome discounted cash flow | Levitronix Medical
Quantitative information for Level 3 Fair Value Measurements Liabilities
Fair value Liabilities		5,782		$ 14,902
Revenue		30,000		50,000
Multiple outcome discounted cash flow | DuraHeart II Acquisition
Quantitative information for Level 3 Fair Value Measurements Liabilities
Fair value Liabilities		5,501		5,189
Multiple outcome discounted cash flow | Apica Acquisition
Quantitative information for Level 3 Fair Value Measurements Liabilities
Fair value Liabilities		$ 26,736		$ 26,467
Discount rate (as a percent)		5.26%		4.63%
Multiple outcome discounted cash flow | Minimum | DuraHeart II Acquisition
Quantitative information for Level 3 Fair Value Measurements Liabilities
Probability of occurrence (as a percent)		5.00%		5.00%
Discount rate (as a percent)		5.26%		4.63%
Multiple outcome discounted cash flow | Minimum | Apica Acquisition
Quantitative information for Level 3 Fair Value Measurements Liabilities
Probability of occurrence (as a percent)		7.50%		7.50%
Multiple outcome discounted cash flow | Maximum | DuraHeart II Acquisition
Quantitative information for Level 3 Fair Value Measurements Liabilities
Probability of occurrence (as a percent)		67.00%		67.00%
Discount rate (as a percent)		25.00%		22.50%
Multiple outcome discounted cash flow | Maximum | Apica Acquisition
Quantitative information for Level 3 Fair Value Measurements Liabilities
Probability of occurrence (as a percent)		30.00%		30.00%

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Fair Value Measurements (Tables)

6 Months Ended

Jul. 04, 2015

Fair Value Measurements

Financial assets and financial liabilities measured at fair value on a recurring basis

	Total Fair Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(in thousands)
At July 4, 2015:
Cash equivalents:
Money market funds	$	131,198	$	131,198	$	—	$	—
Corporate bonds	2,006		—		2,006		—
Municipal bonds	3,063		—		3,063		—
Short-term investments:
Municipal bonds	86,358		—		86,358		—
U.S. government agency securities	6,900		—		6,900		—
Corporate bonds	22,419		—		22,419		—
Commercial paper	12,792		—		12,792		—
Asset-backed securities	573		—		573		—
Prepaid expenses and other assets:
Foreign exchange contracts	188		—		188		—
Long-term investments:
Auction rate securities	4,212		—		—		4,212
Other long-term assets:
Investments included in our deferred compensation plan	1,870		—		1,870		—
Marketable equity securities	1,451		1,451		—		—
Other accrued liabilities:
Foreign exchange contracts	611		—		611		—
Contingent consideration (current and long-term portions)	$	38,019	$	—	$	—	$	38,019

	Total Fair Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(in thousands)
At January 3, 2015:
Cash equivalents:
Money market funds	$	34,742	$	34,742	$	—	$	—
Commercial paper	5,000		—		5,000		—
Corporate bonds	1,006		—		1,006		—
Municipal bonds	2,691		—		2,691		—
Short-term investments:
Municipal bonds	117,681		—		117,681		—
U.S. government agency securities	8,340		—		8,340		—
Corporate bonds	19,632		—		19,632		—
Commercial paper	10,297		—		10,297		—
Asset-backed securities	1,714		—		1,714		—
Prepaid expenses and other assets:
Foreign exchange contracts	3,759		—		3,759		—
Long-term investments:
Auction rate securities	4,239		—		—		4,239
Other long-term assets:
Investments included in our deferred compensation plan	1,552		—		1,552		—
Marketable equity securities	1,836		1,836		—		—
Other accrued liabilities:
Foreign exchange contracts	913		—		913		—
Contingent consideration (current and long-term portions)	$	46,558	$	—	$	—	$	46,558

Summary of aggregate market value, cost basis and gross unrealized gains and losses for available-for-sale investments

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
At July 4, 2015:
Short-term investments:
Municipal bonds	$	86,339	$	49	$	(30	)	$	86,358
U.S. government agency securities	6,901		—		(1		)	6,900
Corporate bonds	22,440				(21		)	22,419
Commercial paper	12,792		—		—			12,792
Asset-backed securities	573		—		—			573
Total short-term investments	$	129,045	$	49	$	(52	)	$	129,042
Long-term investments:
Auction rate securities	$	4,900	$	—	$	(688	)	$	4,212
Other long-term assets:
Marketable equity securities	2,996		—		(1,545		)	1,451
Total long-term	$	7,896	$	—	$	(2,233	)	$	5,663
At January 3, 2015:
Short-term investments:
Municipal bonds	$	117,614	$	83	$	(16	)	$	117,681
U.S. government agency securities	8,341		—		(1		)	8,340
Corporate bonds	19,655		1		(24		)	19,632
Commercial paper	10,297		—		—			10,297
Asset-backed securities	1,715		—		(1		)	1,714
Total short-term investments	$	157,622	$	84	$	(42	)	$	157,664
Long-term investments:
Auction rate securities	$	4,900	$	—	$	(661	)	$	4,239
Other long-term assets:
Marketable equity securities	2,996		—		(1,160		)	1,836
Total long-term	$	7,896	$	—	$	(1,821	)	$	6,075

Schedule of amortized cost and fair value of available-for-sale debt investments, by contractual maturity

	Amortized Cost		Fair Value
	(in thousands)
At July 4, 2015:
Maturing within 1 year	$	80,742	$	80,746
Maturing after 1 year through 5 years	48,303		48,296
Short-term available-for-sale investments	129,045		129,042
Maturing after 5 years	4,900		4,212
	$	133,945	$	133,254

Schedule of roll forward of fair value, as determined by Level 3 inputs, of auction rate securities and contingent consideration (current and long-term portions)

The following table provides a roll forward of the fair value, as determined by Level 3 inputs, of the auction rate securities during the first six months of 2015:

	Auction Rate Securities
	(in thousands)
Balance as of January 3, 2015	$	4,239
Unrealized holding loss on auction rate securities, included in other comprehensive income	(27		)
Balance as of July 4, 2015	$	4,212

The following table provides a roll forward of the fair value, as determined by Level 3 inputs, of contingent consideration during the first six months of 2015:

	Contingent Consideration
	(in thousands)
Balance as of January 3, 2015	$	46,558
Payments	(9,357		)
Change in fair value	818
Balance as of July 4, 2015	$	38,019

Schedule of quantitative information for Level 3 Fair Value Measurements

	Fair Value at July 4, 2015 (in thousands)		Valuation Methodology	Significant Unobservable Input	Weighted Average (range, if applicable)
Auction rate securities	$	4,212	Discounted cash flow	Discount rate	1.64	%
				Market credit spread	2.95	%
				Liquidity factor	0	%
Levitronix Medical Contingent consideration	$	5,782	Multiple outcome discounted cash flow	Revenue	$30.0 million
DuraHeart II Contingent consideration	$	5,501	Multiple outcome discounted cash flow	Milestone dates	2017 to 2026
				Discount rate	5.26% to 25%
				Percent probabilities assigned to scenarios	5% to 67%
Apica Contingent consideration	$	26,736	Multiple outcome discounted cash flow	Milestone dates	2016 to 2020
				Discount rate	5.26	%
				Percent probabilities assigned to scenarios	7.5% to 30%

	Fair Value at January 3, 2015 (in thousands)		Valuation Methodology	Significant Unobservable Input	Weighted Average (range, if applicable)
Auction rate securities	$	4,239	Discounted cash flow	Discount rate	1.61	%
				Market credit spread	2.83	%
				Liquidity factor	0	%
Levitronix Medical Contingent consideration	$	14,902	Multiple outcome discounted cash flow	Revenue	$29.4 million for fiscal year 2015; $50.0 million for fiscal year 2014
DuraHeart II Contingent consideration	$	5,189	Multiple outcome discounted cash flow	Milestone dates	2017 to 2026
				Discount rate	4.63% to 22.5%
				Percent probabilities assigned to scenarios	5% to 67%
Apica Contingent consideration	$	26,467	Multiple outcome discounted cash flow	Milestone dates	2016 to 2020
				Discount rate	4.63	%
				Percent probabilities assigned to scenarios	7.5% to 30%

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014
Cash flows from operating activities:
Net Income	$ 24,028	$ 35,652
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,943	8,207
Fixed assets write-down	172
Investment premium amortization, net	1,810	2,176
Allowance (reduction in ) for bad debt	463	(995)
Foreign currency re-measurement and other	5,149	232
Tax benefit related to stock plans	992	875
Change in fair value of contingent consideration	818	(1,436)
Share-based compensation expense	18,850	14,615
Excess tax benefits from share based compensation	(1,941)	(989)
Loss on disposal of assets	96	613
Change in net deferred tax liability	(428)	(226)
Changes in assets and liabilities:
Receivables	(8,858)	3,697
Inventories	(9,958)	(8,104)
Other current and non-current assets	3,136	559
Accounts payable	8,771	1,167
Income taxes, net	(11)	(7,410)
Other current and non-current liabilities	5,692	(7,799)
Net cash provided by operating activities	55,724	40,834
Cash flows from investing activities:
Purchases of available-for-sale investments	(90,937)	(86,877)
Sales and maturities of available-for-sale investments	116,891	94,232
Purchases of property, plant and equipment	(2,820)	(5,330)
Note receivable from Apica		(2,019)
Net cash provided by investing activities	23,134	6
Cash flows from financing activities:
Payment of contingent consideration	(7,699)	(6,107)
Proceeds from stock option exercises	23,463	2,867
Proceeds from stock issued under employee stock purchase plan	2,499	2,800
Excess tax benefits from share based compensation	1,941	989
Repurchase and retirement of common shares	(32,268)	(46,030)
Net cash used in financing activities	(12,064)	(45,481)
Effect of exchange rate changes on cash and cash equivalents	5,317	271
Net increase (decrease) in cash and cash equivalents	72,111	(4,370)
Net cash and cash equivalents at beginning of period	72,814	139,099
Net cash and cash equivalents at end of period	144,925	134,729
Supplemental disclosure of consolidated cash flow information:
Cash paid for taxes	13,239	24,206
Supplemental disclosure of consolidated non-cash investing and financing activities:
Transfers of equipment from inventory	605	1,012
Repurchases and retirement of common shares through other accrued liabilities	312	2,266
Purchases of property, plant and equipment through accounts payable and accrued liabilities	$ 221	$ 583

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Jul. 04, 2015	Jan. 03, 2015
CONDENSED CONSOLIDATED BALANCE SHEETS
Receivables, allowances (in dollars)	$ 1,892	$ 1,504
Common shares, par value (in dollars per share)	$ 0.00	$ 0.00
Common shares, authorized	100,000	100,000
Common shares, issued	54,741	54,109
Common shares, outstanding	54,741	54,109

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Common and Preferred Stock

6 Months Ended

Jul. 04, 2015

Common and Preferred Stock

Common and Preferred Stock

Note 10. Common and Preferred Stock

On December 5, 2013, the Board of Directors authorized a program to repurchase up to $200.0 million of our shares of common stock (“December 2013 program”), which will expire on December 31, 2015. In the three and six months ended July 4, 2015, we repurchased $4.6 million and $22.9 million, respectively, of shares of our common stock under the December 2013 program, of which $0.3 million was unsettled and accrued in our condensed consolidated balance sheet as of July 4, 2015. As of July 4, 2015, $72.1 million was available for repurchases of shares of our common stock under the December 2013 program. The December 2013 program may be accelerated, suspended, delayed or discontinued at any time.

We are incorporated in California, and as California law does not recognize treasury stock, the shares repurchased decreased the common shares outstanding. We recorded the $22.9 million of shares repurchased in the six months ended July 4, 2015 by reducing the additional paid-in capital (“APIC”) balance by the average value per share reflected in the account prior to the repurchase and allocating the excess as a reduction of retained earnings. Based on this allocation, APIC decreased by $8.0 million and retained earnings decreased by $14.9 million.

We also purchased shares of our common stock that were not part of our publicly announced repurchase program, which represent the surrender value of shares of restricted stock units withheld in order to satisfy tax withholding obligations upon vesting. The shares purchased do not reduce the dollar value that may yet be purchased under our publicly announced repurchase programs. The aggregate value of shares purchased in the six months ended July 4, 2015 was $6.0 million, which decreased APIC and retained earnings by $1.9 million and $4.1 million, respectively, based on the same allocation methodology discussed above.

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Document and Entity Information - shares shares in Millions	6 Months Ended
	Jul. 04, 2015	Jul. 31, 2015
Document and Entity Information
Entity Registrant Name	THORATEC CORP
Entity Central Index Key	0000350907
Document Type	10-Q
Document Period End Date	Jul. 04, 2015
Amendment Flag	false
Current Fiscal Year End Date	--01-02
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		54.8
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2

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Income Taxes

6 Months Ended

Jul. 04, 2015

Income Taxes

Income Taxes

Note 11. Income Taxes

During the first quarter of fiscal 2015, we recorded a $2.3 million out-of-period adjustment to income tax expense related to the overstatement of certain tax benefits from 2011 to 2014. The adjustment was not considered material to the financial statements for the six month period ended July 4, 2015, or any previously issued interim or annual consolidated financial statements.

Our effective income tax rates for the three months ended July 4, 2015 and June 28, 2014 were 30.4% and 32.5%, respectively. Our effective income tax rates for the six months ended July 4, 2015 and June 28, 2014 were 36.4% and 32.6%, respectively. For the three months ended July 4, 2015, the decrease is primarily due to a higher mix of income generated in lower tax rate jurisdictions. For the first six months of 2015, the increase is primarily due to the out-of-period adjustment discussed above and was partially offset by a higher mix of income generated in lower tax rate jurisdictions.

During the next 12 months, it is reasonably possible that audit resolutions and the expiration of statutes of limitations could reduce our unrecognized tax benefits by up to $1.5 million. However, this amount may be subject to change as a result of final determinations by taxing authorities throughout the year.

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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Product sales	$ 128,692	$ 118,063	$ 250,000	$ 243,760
Cost of product sales	39,897	34,307	77,026	74,333
Gross profit	88,795	83,756	172,974	169,427
Operating expenses:
Selling, general and administrative	43,932	35,477	84,049	70,978
Research and development	26,511	23,048	52,628	46,387
Total operating expenses	70,443	58,525	136,677	117,365
Income from operations	18,352	25,231	36,297	52,062
Other income and ( expense ):
Interest expense	(13)	(2)	(13)	(2)
Interest income and other	687	559	1,504	806
Income before income taxes	19,026	25,788	37,788	52,866
Income tax expense	(5,778)	(8,375)	(13,760)	(17,214)
Net income	$ 13,248	$ 17,413	$ 24,028	$ 35,652
Net income per share:
Basic (in dollars per share)	$ 0.24	$ 0.31	$ 0.44	$ 0.63
Diluted (in dollars per share)	$ 0.24	$ 0.30	$ 0.44	$ 0.62
Shares used to compute net income per share:
Basic (in shares)	54,481	56,723	54,246	56,781
Diluted (in shares)	55,261	57,188	55,155	57,538

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Balance Sheet and Statement of Operations Information

6 Months Ended

Jul. 04, 2015

Balance Sheet and Statement of Operations Information

Balance Sheet and Statement of Operations Information

Note 5. Balance Sheet and Statement of Operations Information

The following tables provide details of selected condensed consolidated balance sheets items as of the end of each period:

Inventories consisted of the following:

	July 4, 2015		January 3, 2015
	(in thousands)
Finished goods	$	27,457	$	24,871
Work in process	22,944		18,135
Raw materials	20,458		19,198
Total	$	70,859	$	62,204

Property, plant and equipment, net consisted of the following:

	July 4, 2015			January 3, 2015
	(in thousands)
Land, building and improvements	$	20,600		$	20,600
Equipment and capitalized software	57,295			56,696
Furniture and leasehold improvements	26,473			25,710
Total	104,368			103,006
Less accumulated depreciation	(54,997		)	(51,775		)
Total	$	49,371		$	51,231

As of July 4, 2015, we have $1.6 million of equipment from the DuraHeart II acquisition which is expected to be placed in service in 2015 and is included in the “Equipment and capitalized software” line in the table above.

Depreciation expense was $2.3 million and $4.6 million for the three and six months ended July 4, 2015, respectively, and $2.3 million and $4.4 million for the three and six months ended June 28, 2014, respectively.

Warranty and related costs are accrued for based on our best estimates when management determines that it is probable a charge or liability has been incurred and the amount of loss can be reasonably estimated. Warranty and related accruals and the changes in the balances for the six months ended July 4, 2015 and June 28, 2014 were as follows:

	July 4, 2015			June 28, 2014
	(in thousands)
Balance, beginning of the period	$	10,639		$	9,899
Additions	2,480			1,710
Change in estimate	614			—
Settlements	(5,085		)	(2,258		)
Balance, end of the period	$	8,648		$	9,351

Changes in Accumulated Other Comprehensive Loss by component during the six months ended July 4, 2015:

	Foreign currency items (A)			Unrealized gain (loss) on available-for-sale securities (A)			Total
	(in thousands)
Balance as of January 3, 2015	$	(20,781	)	$	(1,241	)	$	(22,022	)
Other comprehensive loss before reclassification	4,396			(274		)	4,122
Net current period other comprehensive loss	4,396			(274		)	4,122
Balance as of July 4, 2015	$	(16,385	)	$	(1,515	)	$	(17,900	)

(A) All amounts are net of tax.

Items included in “Other accrued liabilities” on our consolidated balance sheets that are in excess of 5% of total current liabilities are as follows:

	July 4, 2015		January 3, 2015
	(in thousands)
Deferred revenue	$	7,066	$	5,063

Interest income and other consisted of the following:

	Three Months Ended					Six Months Ended
	July 4, 2015		June 28, 2014			July 4, 2015		June 28, 2014
	(in thousands)
Interest income	$	177	$	201		$	325	$	425
Foreign currency, net	340		(130		)	560		(187		)
Other	170		488			619		568
Total interest income and other	687		559			1,504		806

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Foreign Exchange Instruments

6 Months Ended

Jul. 04, 2015

Foreign Exchange Instruments

Foreign Exchange Instruments

Note 4. Foreign Exchange Instruments

We utilize foreign currency forward exchange contracts and options with recognized financial institutions to manage our exposure to the impact of fluctuations in foreign currency exchange rates on certain intercompany balances and foreign currency denominated sales and purchase transactions. We do not use derivative financial instruments for speculative or trading purposes. These forward contracts are not designated as hedging instruments for accounting purposes. Principal hedged currencies include the Euro, British Pound Sterling, and U.S. Dollar. The periods of these forward contracts range up to approximately three months and the notional amounts are intended to be consistent with changes in the underlying exposures. We intend to exchange foreign currencies for U.S. Dollars at maturity.

Total gross notional amounts for outstanding derivatives instruments were as follows:

	July 4, 2015		January 3, 2015
Forward contracts:
Euro (sell)	€	11.4 million	€	15.8 million
British Pound Sterling (sell)	£	1.3 million	£	1.5 million
U.S. Dollar (sell)	$	40.8 million	$	21.2 million
U.S. Dollar (buy)	$	76.8 million	$	59.0 million

The following table shows the derivative instruments measured at gross fair value reported on the condensed consolidated balance sheets:

	As of July 4, 2015				As of January 3, 2015
	Prepaid expenses and other assets		Other accrued liabilities		Prepaid expenses and other assets		Other accrued liabilities
	(in thousands)
Derivatives not designated as hedging instruments (forward contracts)	$	188	$	611	$	3,759	$	913

The following table shows the effect of derivative instruments not designated as hedging instruments and foreign currency transactions gains and losses which were included in “Interest income and other” in the condensed consolidated statements of operations:

	Three Months Ended						Six Months Ended
	July 4, 2015			June 28, 2014			July 4, 2015			June 28, 2014
	(in thousands)
Foreign currency exchange gain (loss) on foreign contracts	$	(1,547	)	$	(420	)	$	7,943		$	(67	)
Foreign currency transactions gain (loss)	1,887			291			(7,383		)	(119		)

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Acquisitions (Tables) - Apica Acquisition

6 Months Ended

Jul. 04, 2015

Summary of purchase price allocation as of the acquisition date

The purchase price allocation as of the acquisition date (as adjusted) is summarized as follows (in thousands):

Current assets (excluding cash)	$	548
Identifiable intangible assets:
Developed technology (ASC)	5,300
IPR&D asset (SIS)	26,500
Goodwill	31,491
Total assets	63,839
Less: Liabilities assumed	463
Deferred tax liability	2,562
Total estimated purchase price consideration	60,814
Less: Contingent consideration	25,700
Cash paid or payable at the acquisition closing	$	35,114

Schedule of pro forma financial information

	Six months Ended June 28, 2014
Product sales	$	243,760
Income before taxes	49,793
Net income	33,579

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Segment and Geographic Information

6 Months Ended

Jul. 04, 2015

Segment and Geographic Information

Segment and Geographic Information.

Note 12. Segment and Geographic Information

We have one operating segment and, and therefore, one reportable segment which develops, manufactures and markets proprietary medical devices used for mechanical circulatory support for the treatment of heart failure patients. Our chief operating decision-maker reviews financial information presented on a consolidated basis for purposes of making operating decisions and assessing financial performance, accompanied by disaggregated revenue information by product line. We do not assess the performance of our individual product lines on measures of profit or loss, or asset-based metrics. Therefore, the information below is presented only for revenues by product line, geography, and certain revenue category.

Product sales attributed to a country or region include product sales to hospitals, physicians and distributors and are based on final destinations where the products are sold. No individual customer or individual country outside of the U.S. accounted for more than 10% of product sales during the three and six months ended July 4, 2015 or during the three and six months ended June 28, 2014.

	Three Months Ended				Six Months Ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
	(in thousands)
Product sales by geographic location:
Domestic	$	104,293	$	94,172	$	200,386	$	189,777
International	24,399		23,891		49,614		53,983
Total	$	128,692	$	118,063	$	250,000	$	243,760

	Three Months Ended				Six Months Ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
	(in thousands)
Product sales by product line:
HeartMate	$	113,684	$	101,975	$	218,740	$	211,986
CentriMag	13,373		13,111		27,215		26,105
PVAD and IVAD	815		2,497		2,546		4,749
Other	820		480		1,499		920
Total	$	128,692	$	118,063	$	250,000	$	243,760

	Three Months Ended				Six Months Ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
	(in thousands)
Product sales by category:
Pump	$	93,042	$	81,583	$	179,938	$	170,883
Non-Pump	34,830		36,000		68,563		71,957
Other	820		480		1,499		920
Total	$	128,692	$	118,063	$	250,000	$	243,760

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Legal Proceeding

6 Months Ended

Jul. 04, 2015

Legal Proceeding

Legal Proceeding

Note 8. Legal Proceeding

Legal Proceedings

From time to time we are involved in litigation arising out of claims in the normal course of business. Based on the information presently available, management believes that there are no claims or actions pending or threatened against us, the ultimate resolution of which will have a material effect on our financial position, liquidity or results of operations, although the results of litigation are inherently uncertain.

Purported Shareholder Class Action, filed January 2014

On January 24, 2014, we and three of our present and former officers were named as defendants in a putative shareholder class action entitled Cooper v. Thoratec Corp., Case No. 4:14-cv-00360, filed in the United States District Court for the Northern District of California. The action asserts violations of Section 10(b) of the Securities Exchange Act of 1934 (the “Exchange Act”), and Rule 10b-5 promulgated thereunder, as well as Section 20(a) of the Exchange Act. On April 21, 2014, the Court appointed Bradley Cooper as Lead Plaintiff. On June 20, 2014, Mr. Cooper filed an amended class action complaint (“Amended Complaint”), adding a former officer of the Company as a defendant. The Amended Complaint alleged that during proposed class period (April 29, 2010 to November 27, 2013, inclusive), Defendants made false or misleading statements in various SEC filings, press releases, earnings calls, and healthcare conferences regarding the Company’s business and outlook, focusing primarily on Defendants’ alleged failure to disclose that there was a purported, known increase in the rate of pump thrombosis for patients using the HeartMate II Left Ventricular Assist Device during the proposed class period. Plaintiff sought unspecified damages, among other relief. Defendants filed a motion to dismiss the Amended Complaint for failure to state a claim on August 19, 2014, which the Court granted in its entirety with leave to amend on November 26, 2014. Plaintiff filed a second amended complaint on January 20, 2015 (the “Second Amended Complaint”). In the Second Amended Complaint, Plaintiff amended the class period from May 11, 2011 to August 6, 2014, inclusive, dropped a former officer of the Company as a defendant, and added Plaintiff Todd Labak, who is intended to replace Mr. Cooper as the Lead Plaintiff because Mr. Cooper no longer has Thoratec stock purchases within the proposed class period, among other changes. On March 23, 2015, Defendants filed a motion to dismiss the Second Amended Complaint for failure to state a claim. The motion to dismiss is now fully briefed and the parties are awaiting a ruling by the Court.

Purported Shareholder Class Action Lawsuit, filed July 2015

On July 23, 2015, the Company and its directors were named as defendants in a purported class action shareholder lawsuit entitledSolak v. Grossman, which was filed in the Superior Court of California, County of Alameda in connection with our entrance into the Merger Agreement (as defined below) with St. Jude Medical, Inc. and certain other parties named therein. The lawsuit generally alleges that the members of our Board of Directors breached their fiduciary duties in negotiating and approving the Merger Agreement, that the Merger Agreement undervalues the Company, that our stockholders will not receive adequate or fair value for their common stock in the Merger (as defined below), and that the terms of the Merger Agreement impose improper deal protection terms that preclude competing offers.

Plaintiffs seek, among other things, to declare that the action is properly maintainable as a class action and to enjoin the Company from consummating the proposed Merger in the manner provided for by the Merger Agreement. Plaintiffs further seek unspecified money damages, costs and attorneys’ and experts’ fees. See also Note 14 titled “Subsequent Events” for a more detailed discussion of the Merger Agreement.

Although the results of litigation are inherently uncertain, based on the information currently available, we do not believe the ultimate resolution of the above named actions will have a material effect on our financial position, liquidity or results of operations.

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Goodwill and Purchased Intangible Assets, net

6 Months Ended

Jul. 04, 2015

Goodwill and Purchased Intangible Assets, net

Goodwill and Purchased Intangible Assets, net

Note 6. Goodwill and Purchased Intangible Assets, net

The carrying amount of goodwill and the changes in the balance for the six months ended July 4, 2015 were as follows (in thousands):

Balance as of January 3, 2015	$	225,293
Foreign currency translation impact	1,285
Balance as of July 4, 2015	$	226,578

Intangible assets (net of accumulated amortization and impairment) were as follows:

	At July 4, 2015
	Gross Amount			Accumulated Amortization			Accumulated Impairment			Net Amount
	(in thousands)
Intangible assets subject to amortization:
Patents and trademarks	$	43,532		$	(36,782	)	$	—		$	6,750
Core technology	37,180			(24,063		)	(12,642		)	475
Developed technology	133,373			(86,721		)	(42,079		)	4,573
Customer based relationships and other	7,243			(6,046		)	—			1,197
Pre-existing license agreement	2,300			(1,287		)	—			1,013
Foreign currency translation impact	95			—			—			95
	223,723			(154,899		)	(54,721		)	14,103
Intangible assets not yet subject to amortization:
DuraHeart II IPR&D	12,400			—			(7,700		)	4,700
Apica VAD Tool IPR&D	26,500			—			—			26,500
Foreign currency translation impact	(4,990		)	—			—			(4,990		)
Total intangible assets	$	257,633		$	(154,899	)	$	(62,421	)	$	40,313

	At January 3, 2015
	Gross Amount			Accumulated Amortization			Accumulated Impairment			Net Amount
Intangible assets subject to amortization:
Patents and trademarks	$	43,532		$	(36,095	)	$	—		$	7,437
Core technology	37,180			(23,854		)	(12,642		)	684
Developed technology	133,373			(85,613		)	(42,079		)	5,681
Customer based relationships and other	7,243			(5,569		)	—			1,674
Pre-existing license agreement	2,300			(1,123		)	—			1,177
Foreign currency translation impact	(411		)	—			—			(411		)
	223,217			(152,254		)	(54,721		)	16,242
Intangible assets not yet subject to amortization:
DuraHeart II IPR&D	12,400			—			(7,700		)	4,700
Apica VAD Tool IPR&D	26,500			—			—			26,500
Foreign currency translation impact	(2,954		)	—			—			(2,954		)
Total intangible assets	$	259,163		$	(152,254	)	$	(62,421	)	$	44,488

Amortization expense related to identifiable intangible assets was $1.2 million and $2.4 million for the three and six months ended July 4, 2015, respectively, and $1.9 million and $3.8 million for the three and six months ended June 28, 2014, respectively.

Estimated amortization expenses for the next five fiscal years and all years thereafter, excluding intangible assets not yet subject to amortization are as follows:

	(in thousands)
Fiscal year:
Remainder of 2015	$	2,306
2016	3,392
2017	2,520
2018	2,106
2019	1,712
Thereafter	2,067
Total	$	14,103

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Credit Facility

6 Months Ended

Jul. 04, 2015

Credit Facility.

Credit Facility

Note 7. Credit Facility

On December 19, 2011, we signed an unsecured revolving credit facility agreement that provides for up to $50.0 million revolving credit that will expire on December 19, 2016. The interest rate charged on the amounts borrowed is LIBOR plus a margin (ranging from 0.75% to 1.25%). The agreement contains financial covenants with which we were in compliance as of July 4, 2015. The credit agreement permits us to use the facility for working capital and general corporate purposes. We did not have any borrowings under this credit facility during the six months ended July 4, 2015 or June 28, 2014.

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Share-Based Compensation

6 Months Ended

Jul. 04, 2015

Share-Based Compensation

Share-Based Compensation

Note 9. Share-Based Compensation

Our Amended and Restated 2006 Incentive Stock Plan (“2006 Plan”) permits the issuance of stock options (“options”), restricted stock units (“RSUs”), performance share units (“PSUs”) and other types of awards to employees, directors, and consultants. As of July 4, 2015, approximately 3.2 million shares remained available for future issuance under the 2006 Plan, which assumes that PSUs will convert at 100% of target.

Share-based compensation consisted of the following:

	Three Months Ended				Six Months Ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
	(in thousands)
Cost of product sales	$	675	$	756	$	1,458	$	1,377
Selling, general and administrative expenses	6,198		4,794		12,855		8,819
Research and development	2,580		2,283		4,537		4,419
Total share-based compensation expense before taxes	9,453		7,833		18,850		14,615
Tax benefit for share-based compensation expense	3,141		2,731		6,101		5,003
Total share-based compensation (net of taxes)	$	6,312	$	5,102	$	12,749	$	9,612

Stock Options

The fair value of each option is estimated at the date of grant using the Black-Scholes option-pricing model with the following assumptions:

	Three Months Ended				Six Months Ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
Risk free interest rate (weighted average)	1.50	%	2.21	%	1.52	%	2.19	%
Expected volatility	35	%	35	%	37	%	37	%
Expected option term (years)	5.60		5.88		5.14 to 5.82		4.54 to 5.04
Dividends	None		None		None		None

Stock option activity is summarized as follows:

	Number of Options (in thousands)		Weighted Average Exercise Price Per Share		Weighted Average Remaining Contract Life (years)
Outstanding options as of January 3, 2015	2,737		$	31.04	6.95
Granted	211		41.22
Exercised	(802	)	29.25
Forfeited or expired	(62	)	35.83
Outstanding options as of July 4, 2015	2,084		32.61		7.31
Outstanding options exercisable as of July 4, 2015	933		29.82		5.77
Outstanding options vested as of July 4, 2015 and expected to vest	1,992		$	32.48	7.24

As of July 4, 2015, there was $8.3 million of unrecognized compensation expense, net of estimated forfeitures, related to options, which expense we expect to recognize over a weighted average period of 1.59 years. The weighted average grant-date fair value of options granted in the first six months of 2015 was $14.22 per share.

Restricted Stock Units

Restricted stock unit activity is summarized as follows:

	Number of Units (in thousands)		Weighted Average Grant-Date Fair Value		Weighted Average Remaining Contract Life (in years)
Outstanding units as of January 3, 2015	1,573		$	33.31	1.36
Granted	654		41.06
Released	(500	)	33.33
Forfeited or expired	(127	)	34.82
Outstanding units as of July 4, 2015	1,600		$	36.35	1.68

As of July 4, 2015, there was $48.8 million of unrecognized compensation expense, net of estimated forfeitures, related to RSUs, which amount we expect to recognize over 2.74 years.

Performance Share Units

We issue PSUs representing hypothetical shares of our common stock. Each PSU reflects multiple shares that may be issued to the award recipient, with the number of shares to be issued determined based on performance and market conditions (referred to as either a “Performance Condition PSU” or a “Market Condition PSU”). The actual number of shares the recipient receives at the end of a performance period may range from 0% up to 200% of the target shares granted. Recipients generally must remain employed by us on a continuous basis through the end of the applicable performance period in order to receive shares subject to that award. The stock-based compensation costs for these PSUs, net of estimated forfeitures, are recorded over the three- or four-year vesting period based on a graded accelerated vesting method.

With respect to Performance Condition PSUs, any change in estimates affecting the number of shares to be issued upon vesting of the PSUs would be accounted for as a cumulative adjustment to the compensation expense in the period in which the change occurs. In 2014, we issued approximately 69,000 Performance Condition PSUs and we expect that no shares will be issuable under such PSU’s based on a change in management’s estimate in 2014. There was no change in estimate in first six months of 2015.

On September 22, 2014, we granted approximately 188,000 Market Condition PSUs to our President and Chief Executive Officer. In the first quarter of 2015, we granted approximately 115,000 Market Condition PSUs to certain employees of the Company. Share-based compensation expense related to all Market Condition PSUs was $1.3 million and $1.9 million in the three and six months ended July 4, 2015, respectively. As of July 4, 2015, we had $9.9 million of unrecognized compensation expense, net of estimated forfeitures, which we expect to recognize over a weighted average period of 2.07 years.

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Fair Value Measurements (Details 3) $ in Thousands	6 Months Ended
	Jul. 04, 2015 USD ($)
Auction rate securities
Reconciliation of the beginning and ending balances for the assets measured as fair value using significant unobservable inputs (Level 3):
Balance, beginning of the fiscal year	$ 4,239
Unrealized holding loss on auction rate securities, included in other comprehensive income	(27)
Balance, end of the fiscal year	4,212
Contingent consideration
Changes in liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance, beginning of the fiscal year	46,558
Payments	(9,357)
Change in fair value	818
Balance, end of the fiscal year	$ 38,019

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Subsequent Event

6 Months Ended

Jul. 04, 2015

Subsequent Event

Subsequent Event

14. Subsequent Event

On July 21, 2015, the Company, St. Jude Medical, Inc., a Minnesota corporation (“St. Jude Medical”), and Spyder Merger Corporation, a California corporation and a wholly-owned subsidiary of St. Jude Medical (“Merger Sub”), entered into an Agreement and Plan of Merger (the “Merger Agreement”), pursuant to which Merger Sub will, subject to the satisfaction or waiver of the conditions set forth in the Merger Agreement, merge with and into the Company, and the Company will survive the merger and continue as a wholly-owned subsidiary of St. Jude Medical (the “Merger”). All issued and outstanding shares of Company stock immediately prior to the effective time of the Merger (the “Effective Time”) will be cancelled and converted into the right to receive the merger consideration specified therein, in each case upon the terms and subject to the conditions set forth in the Merger Agreement.

Under the terms of the Merger Agreement, the Company’s shareholders will receive $63.50 in cash, without interest, for each share of the Company’s common stock they own at the Effective Time. The transaction is conditioned upon, among other things, Company shareholder approval, regulatory approvals and other customary closing conditions. The Merger Agreement includes customary representations, warranties and covenants of the Company and St. Jude Medical. The Company has agreed to operate its business and the business of its subsidiaries in the ordinary course of business consistent with past practices through the Effective Time. The transaction is expected to be completed in the fourth quarter of 2015.

The Merger Agreement includes a “go-shop” period, during which the Company will actively solicit alternative proposals from third parties for a period of 30 days from the date of the Merger Agreement continuing through August 20, 2015. The Merger Agreement provides for the Company to pay a termination fee of approximately $30 million to St. Jude Medical if the Company terminates the Merger Agreement in connection with a superior proposal that arises during the go-shop period and a termination fee of approximately $111 million if the Company terminates the Merger Agreement in connection with a superior proposal that arises following the go-shop period. See also Note 8 titled “Legal Proceedings — Purported Shareholder Class Action Lawsuit, filed July 2015” for a discussion on litigation related to the proposed Merger.

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Balance Sheet and Statement of Operations Information (Tables)

6 Months Ended

Jul. 04, 2015

Balance Sheet and Statement of Operations Information

Schedule of Inventories

	July 4, 2015		January 3, 2015
	(in thousands)
Finished goods	$	27,457	$	24,871
Work in process	22,944		18,135
Raw materials	20,458		19,198
Total	$	70,859	$	62,204

Schedule of Property, Plant and Equipment, net

	July 4, 2015			January 3, 2015
	(in thousands)
Land, building and improvements	$	20,600		$	20,600
Equipment and capitalized software	57,295			56,696
Furniture and leasehold improvements	26,473			25,710
Total	104,368			103,006
Less accumulated depreciation	(54,997		)	(51,775		)
Total	$	49,371		$	51,231

Changes in the warranty provision

	July 4, 2015			June 28, 2014
	(in thousands)
Balance, beginning of the period	$	10,639		$	9,899
Additions	2,480			1,710
Change in estimate	614			—
Settlements	(5,085		)	(2,258		)
Balance, end of the period	$	8,648		$	9,351

Schedule of changes in accumulated other comprehensive losses by component

	Foreign currency items (A)			Unrealized gain (loss) on available-for-sale securities (A)			Total
	(in thousands)
Balance as of January 3, 2015	$	(20,781	)	$	(1,241	)	$	(22,022	)
Other comprehensive loss before reclassification	4,396			(274		)	4,122
Net current period other comprehensive loss	4,396			(274		)	4,122
Balance as of July 4, 2015	$	(16,385	)	$	(1,515	)	$	(17,900	)

(A) All amounts are net of tax.

Schedule of accrued liabilities

	July 4, 2015		January 3, 2015
	(in thousands)
Deferred revenue	$	7,066	$	5,063

Summary of Interest income and other income

	Three Months Ended					Six Months Ended
	July 4, 2015		June 28, 2014			July 4, 2015		June 28, 2014
	(in thousands)
Interest income	$	177	$	201		$	325	$	425
Foreign currency, net	340		(130		)	560		(187		)
Other	170		488			619		568
Total interest income and other	687		559			1,504		806

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Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Numerator:
Net income	$ 13,248	$ 17,413	$ 24,028	$ 35,652
Denominator:
Weighted average shares used to compute basis EPS	54,481	56,723	54,246	56,781
Dilutive effect of share-based compensation plans	780	465	909	757
Weighted average shares used to compute diluted EPS	55,261	57,188	55,155	57,538
Net income per share:
Basic (in dollars per share)	$ 0.24	$ 0.31	$ 0.44	$ 0.63
Diluted (in dollars per share)	$ 0.24	$ 0.30	$ 0.44	$ 0.62
Options
Potential common share equivalents excluded
Options to purchase shares not included in the computation of diluted net income per share because their inclusion would be anti-dilutive	184	461	257	749

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Credit Facility (Details) - Credit Facility - USD ($) $ in Millions	6 Months Ended
	Jul. 04, 2015	Dec. 19, 2011
Credit facility
Maximum borrowing capacity		$ 50.0
Minimum | LIBOR
Credit facility
Margin rate (as a percent)	0.75%
Maximum | LIBOR
Credit facility
Margin rate (as a percent)	1.25%

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 13,248	$ 17,413	$ 24,028	$ 35,652
Unrealized gains (losses) on investments (net of taxes (benefits) of $(188) and $(2) for the three months ended July 4, 2015 and June 28, 2014, respectively, and $(183) and $(284) for the six months ended July 4, 2015 and June 28, 2014, respectively)	(282)	4	(274)	(1,407)
Foreign currency translation adjustments	1,667	(781)	4,396	678
Total other comprehensive income (loss)	1,385	(777)	4,122	(729)
Comprehensive income	$ 14,633	$ 16,636	$ 28,150	$ 34,923

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Fair Value Measurements

6 Months Ended

Jul. 04, 2015

Fair Value Measurements

Fair Value Measurements

Note 3. Fair Value Measurements

Our financial assets and liabilities carried at fair value are primarily comprised of investments in money market funds, certificates of deposit, municipal and corporate bonds, commercial paper, U.S. government agency securities, variable demand notes, asset-backed securities, auction rate securities, forward contracts, certain investments held as assets under the deferred compensation plan, marketable equity securities and the contingent consideration in connection with acquisitions. The fair value accounting guidance requires that assets and liabilities be carried at fair value and classified in one of the following three categories:

Level 1: Quoted prices in active markets for identical assets or liabilities that we have the ability to access

Level 2: Observable market based inputs or unobservable inputs that are corroborated by market data such as quoted prices, interest rates and yield curves

Level 3: Inputs that are unobservable data points that are not corroborated by market data

We review the fair value hierarchy classification on a quarterly basis. Changes in the ability to observe valuation inputs may result in a reclassification of levels of certain securities within the fair value hierarchy. We recognize transfers into and out of levels within the fair value hierarchy in the period in which the actual event or change in circumstances caused the transfers to occur. There were no transfers between Level 1, Level 2 and Level 3 during either of the six months ended July 4, 2015 or June 28, 2014.

The following table represents the fair value hierarchy for our financial assets and financial liabilities measured at fair value on a recurring basis:

	Total Fair Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(in thousands)
At July 4, 2015:
Cash equivalents:
Money market funds	$	131,198	$	131,198	$	—	$	—
Corporate bonds	2,006		—		2,006		—
Municipal bonds	3,063		—		3,063		—
Short-term investments:
Municipal bonds	86,358		—		86,358		—
U.S. government agency securities	6,900		—		6,900		—
Corporate bonds	22,419		—		22,419		—
Commercial paper	12,792		—		12,792		—
Asset-backed securities	573		—		573		—
Prepaid expenses and other assets:
Foreign exchange contracts	188		—		188		—
Long-term investments:
Auction rate securities	4,212		—		—		4,212
Other long-term assets:
Investments included in our deferred compensation plan	1,870		—		1,870		—
Marketable equity securities	1,451		1,451		—		—
Other accrued liabilities:
Foreign exchange contracts	611		—		611		—
Contingent consideration (current and long-term portions)	$	38,019	$	—	$	—	$	38,019

	Total Fair Value		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(in thousands)
At January 3, 2015:
Cash equivalents:
Money market funds	$	34,742	$	34,742	$	—	$	—
Commercial paper	5,000		—		5,000		—
Corporate bonds	1,006		—		1,006		—
Municipal bonds	2,691		—		2,691		—
Short-term investments:
Municipal bonds	117,681		—		117,681		—
U.S. government agency securities	8,340		—		8,340		—
Corporate bonds	19,632		—		19,632		—
Commercial paper	10,297		—		10,297		—
Asset-backed securities	1,714		—		1,714		—
Prepaid expenses and other assets:
Foreign exchange contracts	3,759		—		3,759		—
Long-term investments:
Auction rate securities	4,239		—		—		4,239
Other long-term assets:
Investments included in our deferred compensation plan	1,552		—		1,552		—
Marketable equity securities	1,836		1,836		—		—
Other accrued liabilities:
Foreign exchange contracts	913		—		913		—
Contingent consideration (current and long-term portions)	$	46,558	$	—	$	—	$	46,558

Financial assets and liabilities are considered Level 2 when their fair values are determined using inputs that are observable in the market or can be derived principally from or corroborated by observable market data such as pricing for similar securities, recently executed transactions, cash flow models with yield curves, and benchmark securities. Our Level 2 financial assets and liabilities include short-term investments, foreign exchange instruments and certain of our deferred compensation plan securities. In addition, Level 2 financial instruments are valued using comparisons to like-kind financial instruments and models that use readily observable market data as their basis.

Financial assets and liabilities are considered Level 3 when their fair values are determined using pricing models, discounted cash flow methodologies, or similar techniques, and at least one significant model assumption or input is unobservable. Level 3 financial assets and liabilities include the following:

Auction rate securities—Due to limited market activity the determination of fair value requires significant judgment and estimates. The auction rate securities were valued using a discounted cash flow model over a five-year period based on estimated interest rates, the present value of future principal payments, and interest payments discounted at rates considered to reflect the current market conditions and the credit quality of auction rate securities.

Contingent liabilities—The fair value of the contingent consideration related to the acquisitions of Levitronix Medical, DuraHeart II and Apica requires significant management judgment and estimates. The fair value of each contingent consideration is re-measured at the end of each reporting period with the change in fair value recorded in operating expense on our condensed consolidated statements of operations. Actual amounts paid may differ from the obligations recorded. The fair value of the Levitronix Medical contingent consideration is calculated using the income approach, using various revenue assumptions and applying a probability to each scenario. The fair value of the DuraHeart II contingent consideration is calculated using the income approach, using various estimates, including probabilities of success, discount rate and the estimated amount of time until the conditions of the milestone payments are met. Refer to Note 2 for a discussion of the fair value of the contingent consideration associated with the Apica acquisition and further information regarding fair value measurements associated with the DuraHeart II acquisition.

Available-for-sale investments are carried at fair value and are included in the tables above under short- and long-term investments. The aggregate market value, cost basis and gross unrealized gains and losses of available-for-sale investments by major security type are as follows:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
At July 4, 2015:
Short-term investments:
Municipal bonds	$	86,339	$	49	$	(30	)	$	86,358
U.S. government agency securities	6,901		—		(1		)	6,900
Corporate bonds	22,440				(21		)	22,419
Commercial paper	12,792		—		—			12,792
Asset-backed securities	573		—		—			573
Total short-term investments	$	129,045	$	49	$	(52	)	$	129,042
Long-term investments:
Auction rate securities	$	4,900	$	—	$	(688	)	$	4,212
Other long-term assets:
Marketable equity securities	2,996		—		(1,545		)	1,451
Total long-term	$	7,896	$	—	$	(2,233	)	$	5,663
At January 3, 2015:
Short-term investments:
Municipal bonds	$	117,614	$	83	$	(16	)	$	117,681
U.S. government agency securities	8,341		—		(1		)	8,340
Corporate bonds	19,655		1		(24		)	19,632
Commercial paper	10,297		—		—			10,297
Asset-backed securities	1,715		—		(1		)	1,714
Total short-term investments	$	157,622	$	84	$	(42	)	$	157,664
Long-term investments:
Auction rate securities	$	4,900	$	—	$	(661	)	$	4,239
Other long-term assets:
Marketable equity securities	2,996		—		(1,160		)	1,836
Total long-term	$	7,896	$	—	$	(1,821	)	$	6,075

As of July 4, 2015, our marketable equity securities have been in a continuous unrealized loss position for more than twelve months. We believe that the decline in fair value of the marketable equity securities below our cost basis is temporary and we intend to retain the securities for a sufficient period of time to allow for recovery in the market value of these investments.

Our deferred compensation plan includes our corporate owned life insurance policies and mutual fund investments. The underlying mutual fund investments are deemed trading securities. The mutual fund investments’ fair value and the cash surrender value of our corporate-owned life insurance policies are classified in the condensed consolidated balance sheets in “Other long-term assets.” The aggregate value of our deferred compensation plan assets as of July 4, 2015 and January 3, 2015 was $6.4 million and $6.0 million, respectively. The unrealized gain before tax from the change in the value of the deferred compensation plan was not significant in the six months ended July 4, 2015 and June 28, 2014.

The amortized cost and fair value of available-for-sale debt investments, by contractual maturity, were as follows:

	Amortized Cost		Fair Value
	(in thousands)
At July 4, 2015:
Maturing within 1 year	$	80,742	$	80,746
Maturing after 1 year through 5 years	48,303		48,296
Short-term available-for-sale investments	129,045		129,042
Maturing after 5 years	4,900		4,212
	$	133,945	$	133,254

The following table provides a roll forward of the fair value, as determined by Level 3 inputs, of the auction rate securities during the first six months of 2015:

	Auction Rate Securities
	(in thousands)
Balance as of January 3, 2015	$	4,239
Unrealized holding loss on auction rate securities, included in other comprehensive income	(27		)
Balance as of July 4, 2015	$	4,212

The following table provides a roll forward of the fair value, as determined by Level 3 inputs, of contingent consideration during the first six months of 2015:

	Contingent Consideration
	(in thousands)
Balance as of January 3, 2015	$	46,558
Payments	(9,357		)
Change in fair value	818
Balance as of July 4, 2015	$	38,019

The following table presents quantitative information about the inputs and valuation methodologies used for our fair value measurements classified in Level 3 of the fair value hierarchy at July 4, 2015 and January 3, 2015:

	Fair Value at July 4, 2015 (in thousands)		Valuation Methodology	Significant Unobservable Input	Weighted Average (range, if applicable)
Auction rate securities	$	4,212	Discounted cash flow	Discount rate	1.64	%
				Market credit spread	2.95	%
				Liquidity factor	0	%
Levitronix Medical Contingent consideration	$	5,782	Multiple outcome discounted cash flow	Revenue	$30.0 million
DuraHeart II Contingent consideration	$	5,501	Multiple outcome discounted cash flow	Milestone dates	2017 to 2026
				Discount rate	5.26% to 25%
				Percent probabilities assigned to scenarios	5% to 67%
Apica Contingent consideration	$	26,736	Multiple outcome discounted cash flow	Milestone dates	2016 to 2020
				Discount rate	5.26	%
				Percent probabilities assigned to scenarios	7.5% to 30%

	Fair Value at January 3, 2015 (in thousands)		Valuation Methodology	Significant Unobservable Input	Weighted Average (range, if applicable)
Auction rate securities	$	4,239	Discounted cash flow	Discount rate	1.61	%
				Market credit spread	2.83	%
				Liquidity factor	0	%
Levitronix Medical Contingent consideration	$	14,902	Multiple outcome discounted cash flow	Revenue	$29.4 million for fiscal year 2015; $50.0 million for fiscal year 2014
DuraHeart II Contingent consideration	$	5,189	Multiple outcome discounted cash flow	Milestone dates	2017 to 2026
				Discount rate	4.63% to 22.5%
				Percent probabilities assigned to scenarios	5% to 67%
Apica Contingent consideration	$	26,467	Multiple outcome discounted cash flow	Milestone dates	2016 to 2020
				Discount rate	4.63	%
				Percent probabilities assigned to scenarios	7.5% to 30%

Auction Rate Securities

The significant unobservable inputs used in the fair value measurement of the auction rate securities are the weighted average discount rate, market credit spread and liquidity factor. A significant increase (decrease) in the discount rate in isolation could result in a significantly higher (lower) fair value measurement, whereas a significant increase (decrease) in the market credit spread and liquidity factor in isolation could result in a significantly lower (higher) fair value measurement. Although the discount rate as compared to the market credit spread and liquidity factors are not directly related, they will generally move in opposite directions.

The fair value of auction rate securities is calculated on a quarterly basis by senior management based on a collaborative effort of the corporate treasury and accounting groups. To assess the reasonableness of the fair value measurement, management compares its fair value measurement to the values calculated by independent third parties.

Contingent Consideration

The fair values of contingent consideration are measured using projected payment dates, discount rates, probabilities of payments, and projected revenues (for revenue-based considerations). Projected contingent payment amounts are discounted back to the current period using a discounted cash flow model. A significant increase (decrease) in the projected revenue in isolation could result in a significantly higher (lower) fair value measurement; a significant delay (acceleration) in the product development (including projected regulatory milestone) achievement date in isolation could result in a significantly lower (higher) fair value measurement; a significant increase (decrease) in the discount rate in isolation could result in a significantly lower (higher) fair value measurement; and the changes in the probability of occurrence between the outcomes in isolation could result in a significant change in fair value measurement.

The fair values of the contingent consideration are calculated on a quarterly basis by management based on a collaborative effort of our regulatory, research and development, operations, finance and accounting groups, as appropriate. Potential valuation adjustments are made as additional information becomes available, including the progress toward achieving revenue and milestone targets as compared to initial projections, the impact of market competition and changes in actual and projected product mix and average selling price, with the impact of such adjustments being recorded in the consolidated statements of operations.

Assets and Liabilities That Are Measured at Fair Value on a Nonrecurring Basis

Non-marketable equity investments and non-financial assets, such as goodwill, intangible assets, and property, plant, and equipment (measured at fair value if a write-down is recognized) are evaluated for impairment annually or when indicators of impairment exist. Non-financial assets such as identified intangible assets acquired in connection with our acquisitions are measured at fair value using Level 3 inputs, which include discounted cash flow methodologies, or similar techniques, when there is limited market activity and the determination of fair value requires significant judgment and estimates. In addition, in evaluating the fair value of goodwill impairment, further corroboration is obtained using our market capitalization. No impairment was recorded in either the six months ended July 4, 2015 or June 28, 2014.

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Goodwill and Purchased Intangible Assets, net (Tables)

6 Months Ended

Jul. 04, 2015

Goodwill and Purchased Intangible Assets, net

Schedule of changes in carrying amount of goodwill

The carrying amount of goodwill and the changes in the balance for the six months ended July 4, 2015 were as follows (in thousands):

Balance as of January 3, 2015	$	225,293
Foreign currency translation impact	1,285
Balance as of July 4, 2015	$	226,578

Schedule of intangible assets on the condensed consolidated balance sheets

	At July 4, 2015
	Gross Amount			Accumulated Amortization			Accumulated Impairment			Net Amount
	(in thousands)
Intangible assets subject to amortization:
Patents and trademarks	$	43,532		$	(36,782	)	$	—		$	6,750
Core technology	37,180			(24,063		)	(12,642		)	475
Developed technology	133,373			(86,721		)	(42,079		)	4,573
Customer based relationships and other	7,243			(6,046		)	—			1,197
Pre-existing license agreement	2,300			(1,287		)	—			1,013
Foreign currency translation impact	95			—			—			95
	223,723			(154,899		)	(54,721		)	14,103
Intangible assets not yet subject to amortization:
DuraHeart II IPR&D	12,400			—			(7,700		)	4,700
Apica VAD Tool IPR&D	26,500			—			—			26,500
Foreign currency translation impact	(4,990		)	—			—			(4,990		)
Total intangible assets	$	257,633		$	(154,899	)	$	(62,421	)	$	40,313

	At January 3, 2015
	Gross Amount			Accumulated Amortization			Accumulated Impairment			Net Amount
Intangible assets subject to amortization:
Patents and trademarks	$	43,532		$	(36,095	)	$	—		$	7,437
Core technology	37,180			(23,854		)	(12,642		)	684
Developed technology	133,373			(85,613		)	(42,079		)	5,681
Customer based relationships and other	7,243			(5,569		)	—			1,674
Pre-existing license agreement	2,300			(1,123		)	—			1,177
Foreign currency translation impact	(411		)	—			—			(411		)
	223,217			(152,254		)	(54,721		)	16,242
Intangible assets not yet subject to amortization:
DuraHeart II IPR&D	12,400			—			(7,700		)	4,700
Apica VAD Tool IPR&D	26,500			—			—			26,500
Foreign currency translation impact	(2,954		)	—			—			(2,954		)
Total intangible assets	$	259,163		$	(152,254	)	$	(62,421	)	$	44,488

Schedule of estimated amortization expense for the next five fiscal years and all years thereafter

	(in thousands)
Fiscal year:
Remainder of 2015	$	2,306
2016	3,392
2017	2,520
2018	2,106
2019	1,712
Thereafter	2,067
Total	$	14,103

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Balance Sheet and Statement of Operations Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014	Jan. 03, 2015
Inventories
Finished goods	$ 27,457		$ 27,457		$ 24,871
Work-in-process	22,944		22,944		18,135
Raw materials	20,458		20,458		19,198
Total inventories	70,859		70,859		62,204
Property, plant and equipment, gross	104,368		104,368		103,006
Less accumulated depreciation and amortization	(54,997)		(54,997)		(51,775)
Total	49,371		49,371		51,231
Depreciation expense	2,300	$ 2,300	4,600	$ 4,400
Land, building and improvements
Inventories
Property, plant and equipment, gross	20,600		20,600		20,600
Equipment and capitalized software
Inventories
Property, plant and equipment, gross	57,295		57,295		56,696
Equipment and capitalized software | DuraHeart II Acquisition
Inventories
Property, plant and equipment, gross	1,600		1,600
Furniture and leasehold improvements
Inventories
Property, plant and equipment, gross	$ 26,473		$ 26,473		$ 25,710

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Net Income Per Share

6 Months Ended

Jul. 04, 2015

Net Income Per Share

Net Income Per Share

13. Net Income Per Share

We calculate basic earnings per share (“EPS”) using net earnings and the weighted-average number of shares outstanding during the reporting period. Diluted EPS includes any dilutive effect of outstanding options and RSUs. PSUs are excluded from the shares used to compute diluted EPS until the performance conditions associated with the PSUs are met.

The reconciliations of the numerators and denominators of each of the basic and diluted EPS calculations were as follows:

	Three Months Ended				Six Months Ended
	July 4, 2015		June 28, 2014		July 4, 2015		June 28, 2014
	(in thousands, except per share data)
Numerator:
Net Income	$	13,248	$	17,413	$	24,028	$	35,652
Denominator:
Weighted average shares used to compute basic EPS	54,481		56,723		54,246		56,781
Dilutive effect of share-based compensation plans	780		465		909		757
Weighted average shares used to compute diluted EPS	55,261		57,188		55,155		57,538
Net income per share:
Basic	$	0.24	$	0.31	$	0.44	$	0.63
Diluted	$	0.24	$	0.30	$	0.44	$	0.62

Potential common share equivalents excluded where the inclusion would be anti-dilutive are as follows:

	Three Months Ended		Six Months Ended
	July 4, 2015	June 28, 2014	July 4, 2015	June 28, 2014
	(in thousands)
Options to purchase shares not included in the computation of diluted net income per share because their inclusion would be anti-dilutive	184	461	257	749