UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

(Mark One)

For the transition period from ________to _________

Commission file number 0-12933

LAM RESEARCH CORPORATION

4650 Cushing Parkway
Fremont, California 94538

(510) 572-0200

     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 [ ]

     Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Exchange Act). YES [X] NO [ ]

     As of April 27, 2004, there were 134,011,598 shares of Registrant’s Common Stock outstanding.

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

LAM RESEARCH CORPORATION

(1)

Derived from June 29, 2003 audited financial statements.

See Notes to Condensed Consolidated Financial Statements

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LAM RESEARCH CORPORATION

See Notes to Condensed Consolidated Financial Statements.

4

LAM RESEARCH CORPORATION

See Notes to Condensed Consolidated Financial Statements.

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LAM RESEARCH CORPORATION

NOTE 1 — BASIS OF PRESENTATION

     The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting only of normal recurring adjustments) considered necessary for a fair presentation have been included. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements of Lam Research Corporation (the Company or Lam) for the fiscal year ended June 29, 2003, which are included in the Annual Report on Form 10-K, File Number 0-12933. The Company’s Form 10-K, Forms 10-Q and Forms 8-K are available online at the Securities and Exchange Commission website on the Internet. The address of that site is http://www.sec.gov. The Company also posts the Form 10-K, Forms 10-Q and Forms 8-K on the corporate website at http://www.lamrc.com.

     The Company’s reporting period is a 52/53-week fiscal year. The Company’s current fiscal year will end June 27, 2004 and includes 52 weeks. The quarter ended March 28, 2004 and the quarter ended March 30, 2003 both included 13 weeks.

     Reclassifications: Certain amounts presented in the comparative financial statements for prior years have been reclassified to conform to the fiscal 2004 presentation.

NOTE 2 — RECENT ACCOUNTING PRONOUNCEMENTS

     Accounting for Revenue Arrangements with Multiple Deliverables: In November 2002, the Financial Accounting Standards Board’s (FASB) Emerging Issues Task Force (EITF) reached a consensus on EITF Issue No. 00-21, “Accounting for Revenue Arrangements with Multiple Deliverables” (EITF 00-21). EITF 00-21 provides guidance on how to account for arrangements that involve the delivery or performance of multiple deliverables (products, services, and/or rights to use assets). The provisions of EITF 00-21 are applicable for revenue arrangements entered into in fiscal periods beginning after June 15, 2003. The adoption of EITF 00-21 did not have a material impact on the Company’s financial position or results of operations.

     Amendment of Statement 133, “Accounting for Derivative Instruments and Hedging Activities” (SFAS 133), on Derivative Instruments and Hedging Activities: In April 2003, the FASB issued Statement of Financial Accounting Standards (SFAS) No. 149, “Amendment of Statement 133 on Derivative Instruments and Hedging Activities”, (SFAS 149). SFAS 149 amends SFAS 133 for decisions made as part of the Derivatives Implementation Group (DIG) and changes financial reporting by requiring that contracts with comparable characteristics be accounted for similarly. Specifically, SFAS 149 (1) clarifies under what circumstances a contract with an initial net investment meets the characteristic of a derivative as discussed in SFAS 133, (2) clarifies when a derivative contains a financing component that requires reporting as cash flows from financing activities in the statement of cash flows and (3) amends the definition of an “underlying” to correspond to the language in FASB Interpretation (FIN) Number 45, “Guarantor’s Accounting and Disclosure Requirements for Guarantees, Including

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Indirect Indebtedness of Others.” These changes will result in more consistent reporting of contracts that are derivatives in their entirety or that contain embedded derivatives that require separate accounting. SFAS 149 is effective for contracts entered into or modified after June 30, 2003, and for hedging relationships designated after June 30, 2003. However, the provisions of SFAS 149 that codify the previous decisions made by the DIG are already effective and should continue to be applied in accordance with their prior respective effective dates. The adoption of SFAS 149 did not have a material impact on the Company’s financial position or results of operations.

     Accounting for Certain Financial Instruments with Characteristics of both Liabilities and Equity: In May 2003, the FASB issued Statement of Financial Accounting Standards No. 150, “Accounting for Certain Financial Instruments with Characteristics of both Liabilities and Equity”, (SFAS 150). SFAS 150 establishes standards for how an issuer classifies and measures certain financial instruments with characteristics of both liabilities and equity. SFAS 150 represents a significant change in practice in the accounting for a number of financial instruments including mandatorily redeemable equity instruments and certain equity derivatives that frequently are used in connection with share repurchase programs. SFAS 150 generally requires liability classification for two broad classes of financial instruments: (1) instruments that represent, or are indexed to, an obligation to buy back the issuer’s shares, regardless of whether the instrument is settled on a net-cash or gross physical basis, (2) obligations that can be settled in shares but meet one of the following conditions: (a) derive their value predominately from some other underlying, or (b) have a fixed value, or have a value to the counterparty that moves in the opposite direction as the issuer’s shares. Many of the instruments within the scope of SFAS 150 were previously classified by the issuer as equity or temporary equity. SFAS 150 is effective for financial instruments entered into or modified after May 31, 2003 and otherwise is effective the first quarter of fiscal 2004. The adoption of SFAS 150 did not have a material impact on the Company’s financial position or results of operations.

     Revenue Recognition: In December 2003, the Securities and Exchange Commission (SEC) issued Staff Accounting Bulletin (SAB) No. 104, “Revenue Recognition” (SAB 104). SAB 104 updates portions of the interpretive guidance included in Topic 13 of the codification of the Staff Accounting Bulletins in order to make this interpretive guidance consistent with current authoritative accounting and auditing guidance and SEC rules and regulations. The Company believes it is following the guidance of SAB 104, and the issuance of SAB 104 did not have a material impact on the Company’s financial position or results of operations.

NOTE 3 — STOCK-BASED COMPENSATION PLANS

     The Company has adopted stock option plans that provide for the grant to employees of various equity incentive awards, including options to purchase shares of Lam common stock. In addition, the plans permit the grant of nonstatutory stock options to paid consultants and employees, and provide for the automatic grant of nonstatutory stock options to outside directors. The Company also has an employee stock purchase plan (ESPP) that allows employees to purchase its common stock.

     The Company accounts for its stock option plans and stock purchase plan under the provisions of Accounting Principles Board (APB) Opinion No. 25, “Accounting for Stock Issued to Employees” (APB 25) and Financial Accounting Standards Board Interpretation (FIN) 44, “Accounting for Certain Transactions Involving Stock Compensation — an Interpretation of APB Opinion No. 25” (FIN 44). Pro forma information regarding net income (loss) and net income (loss) per share is required by SFAS No. 123, “Accounting for Stock-Based

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Compensation” (SFAS 123), as amended by SFAS No. 148, “Accounting for Stock-Based Compensation-Transition and Disclosure” (SFAS 148) as if the Company had accounted for its stock option and stock purchase plans under the fair value method of SFAS 123 and SFAS 148. The following table illustrates the effect on net income (loss) and net income (loss) per share if the Company had accounted for its stock option and stock purchase plans under the fair value method of accounting under SFAS 123 and SFAS 148:

     For pro forma purposes, the estimated fair value of the Company’s stock-based awards is amortized over the options’ vesting period (for options) and the respective four, six, twelve, or fifteen-month purchase periods (for stock purchases under the employee stock purchase plan). The fair value of the Company’s stock options and stock purchase plans was estimated using a Black-Scholes option valuation model, which was developed for use in estimating the fair value of traded options which have no vesting restrictions and which are fully transferable. The model requires the input of highly subjective assumptions, including expected stock price volatility and the estimated life of each option. The fair value of the Company’s stock-based awards granted in the three and nine-month periods of fiscal 2004 and fiscal 2003 was estimated assuming no expected dividends and the following weighted-average assumptions:

NOTE 4 — INVENTORIES

     Inventories are stated at the lower of cost (first-in, first-out method) or market. Inventories consist of the following:

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NOTE 5 — PROPERTY AND EQUIPMENT

     Property and equipment, net, consist of the following:

NOTE 6 — LONG-TERM DEBT AND OTHER LONG-TERM LIABILITIES

     Long-term debt and other long-term liabilities consist of the following:

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     At March 28, 2004, obligations under debt financing consist of the Company’s 4% convertible subordinated notes (4% Notes). Details of the 4% Notes are:

     The carrying value of the 4% Notes has been adjusted to reflect changes in fair value attributable to changes in the benchmark interest rate in connection with the Company’s fair value hedge accomplished through the interest rate swap agreement (the swap) discussed in Note 12. At March 28, 2004, the carrying value of the 4% Notes was $312.8 million as compared to $319.3 million at June 29, 2003. The corresponding gain of $6.5 million was recorded in other income (expense), offset by a recorded loss of $6.6 million on the carrying value of the swap during the nine months ended March 28, 2004.

     Under the terms of the agreement, the Company must provide a minimum of $6.0 million of collateral plus an amount equal to the unfavorable mark-to-market exposure (fair value) on the swap. Therefore, the amount of cash collateral the Company will have to post in the future will fluctuate from quarter to quarter commensurate with the unfavorable mark-to-market exposure on the swap instrument. Generally, the required collateral will rise as interest rates rise. The Company had $6.0 million of collateral (reflected as restricted cash) recorded on the consolidated balance sheet related to this agreement as of March 28, 2004 and June 29, 2003.

     In April, 2004, the Company settled its interest rate swap agreement and announced plans to repay in full its 4% Notes in June 2004, two years prior to their maturity. Please see Note 16 for additional information.

     The Company’s 5% Convertible Subordinated Notes matured on September 2, 2002 and were repaid in full. This resulted in a cash outlay of approximately $309.8 million in the September 2002 quarter.

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NOTE 7 — DEFERRED STOCK-BASED COMPENSATION

     During the quarter ended December 29, 2002, the Company recorded $3.4 million of deferred stock-based compensation in stockholders’ equity, which was offset by a corresponding entry to additional paid-in capital in stockholders’ equity, in connection with the modification of terms of a fixed stock option award previously issued to the Company’s Chairman and Chief Executive Officer. The modification extended the contractual life of the stock option for a period of three years and modified the vesting requirements. However, no changes were made to either the number of shares of the Company’s stock subject to the option, or the option’s exercise price. Accordingly, the modification resulted in the remeasurement of compensation expense based on the option’s intrinsic value on the date of modification in accordance with the provisions of APB 25 and FIN 44. The deferred stock-based compensation balance of $3.4 million was being amortized ratably over the vesting period of the modified options, or 16 quarters. Under the terms of this modification, if the Nasdaq National Market closing price of the Company’s common stock reached or exceeded $20.00 per share, all unvested shares would immediately vest and become exercisable. In the event of such accelerated vesting, all remaining deferred compensation would immediately be recognized as compensation expense.

     During the quarter ended September 28, 2003, the Company added a second condition to the accelerated vesting provision contained in this stock option award. The second condition required the Company’s fiscal quarter net income, based on U.S. generally accepted accounting principles, to exceed $2.5 million after deducting any incremental amortization expense that resulted from acceleration of these same options. The two conditions needed not to be met simultaneously nor in a specific order. Both conditions were met during the quarter ended September 28, 2003 and, as a result, all options under this arrangement were immediately vested in full. Accordingly, the Company recognized the remaining deferred stock-based compensation balance of $2.8 million as compensation expense within selling, general and administrative expenses in the Company’s condensed consolidated statement of operations for the three months ended September 28, 2003.

NOTE 8 — OTHER INCOME (EXPENSE), NET

     The significant components of other income (expense), net, are as follow:

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NOTE 9 — NET INCOME (LOSS) PER SHARE

     Basic net income (loss) per share is computed by dividing net income (loss) by the weighted-average number of common shares outstanding during the period. Diluted net income (loss) per share is computed as though all potential common shares that are dilutive were outstanding during the period. The following table provides a reconciliation of the numerators and denominators of the basic and diluted computations for net income (loss) per share.