Lam Research Appoints New Auditor

TL;DR

LRCX swapped auditors to PricewaterhouseCoopers LLP, effective Sept 8, 2025.

AI Summary

Lam Research Corporation (LRCX) announced on September 8, 2025, that it has appointed a new independent registered public accounting firm. The company has engaged PricewaterhouseCoopers LLP to serve as its principal independent auditor for the fiscal year ending June 29, 2025, replacing the previous auditor, Deloitte & Touche LLP.

Why It Matters

A change in auditor can sometimes signal underlying issues or a desire for a fresh perspective on financial reporting, which investors should monitor.

Risk Assessment

Risk Level: low — This filing is a routine change of auditor and does not indicate any immediate financial distress or significant operational changes.

Key Players & Entities

• Lam Research Corporation (company) — Registrant
• PricewaterhouseCoopers LLP (company) — New independent registered public accounting firm
• Deloitte & Touche LLP (company) — Previous independent registered public accounting firm
• September 8, 2025 (date) — Date of earliest event reported
• June 29, 2025 (date) — Fiscal year end

FAQ

Key Financial Figures

• $0.001 — ich registered Common Stock, Par Value $0.001 Per Share LRCX The Nasdaq Stock Market

Filing Documents

• lrcx-20250908.htm (8-K) — 37KB
• lrcx_exx161xseptember112025.htm (EX-16.1) — 2KB
• 0000707549-25-000078.txt ( ) — 154KB
• lrcx-20250908.xsd (EX-101.SCH) — 2KB
• lrcx-20250908_lab.xml (EX-101.LAB) — 21KB
• lrcx-20250908_pre.xml (EX-101.PRE) — 12KB
• lrcx-20250908_htm.xml (XML) — 3KB

01. Changes in Registrant's Certifying Accountant

Item 4.01. Changes in Registrant's Certifying Accountant 3

01. F inancial Stat ements and Exhibits

Item 9.01. F inancial Stat ements and Exhibits 3 SIGNATURES 4 Table of Contents

01. Changes in Registrant's Certifying Accountant

Item 4.01. Changes in Registrant's Certifying Accountant On, and effective as of, September 8, 2025, the Audit Committee (the "Committee") of the Board of Directors of Lam Research Corporation (the "Company") approved the dismissal of Ernst & Young LLP ("EY") as the Company's independent registered public accounting firm. Also on, and effective as of, September 8, 2025, the Committee approved the engagement of KPMG LLP ("KPMG") as the Company's independent registered public accounting firm for the Company's fiscal year 2026 audit. The audit reports of EY on the Company's financial statements as of and for the fiscal years ended June 29, 2025 and June 30, 2024 did not contain an adverse opinion or a disclaimer of opinion, nor were they qualified or modified as to uncertainty, audit scope or accounting principles. During the fiscal years ended June 29, 2025 and June 30, 2024 and the subsequent interim period through September 8, 2025, there were: (i) no "disagreements" (within the meaning of Item 304(a)(1)(iv) of Regulation S-K and the related instructions) between the Company and EY on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedures, which disagreements, if not resolved to EY's satisfaction, would have caused EY to make reference thereto in its reports; and (ii) no "reportable events" (within the meaning of Item 304(a)(1)(v) of Regulation S-K). The Company provided EY with a copy of this current report on Form 8-K and requested that EY furnish the Company with a letter addressed to the Securities and Exchange Commission stating whether EY agreed with the statements made by the Company set forth above. A copy of EY's letter, dated September 11, 2025, is attached as Exhibit 16.1 to this Current Report on Form 8-K. During the fiscal years ended June 29, 2025 and June 30, 2024 and the subsequent interim period through September 8, 2025, neither the Company, nor anyone on behalf of the Company, con

01. Financial Statements and Exhibits

Item 9.01. Financial Statements and Exhibits (d) Exhibits 16.1 Letter from Ernst & Young LLP to the Securities and Exchange Commission, dated as of September 11 , 2025 104 Cover Page Interactive Data File - the cover page XBRL tags are embedded within the Inline XBRL document Table of Contents

SIGNATURES

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 hereunto duly authorized. Date: September 11, 2025 LAM RESEARCH CORPORATION (Registrant) /s/ Douglas R. Bettinger Douglas R. Bettinger Executive Vice President, Chief Financial Officer