WDC: Financial results

Item 2.02 Results of Operations and Financial Condition. On October 22, 2026 , Western Digital Corporation (the “Company”) announced financial results for the first quarter of fiscal 2027, ended October 2, 2026. A copy of the press release making this announcement is attached hereto as Exhibit 99.1 and is incorporated herein by reference. In accordance with General Instruction B.2 of Form 8-K, the information in this Item 2.02, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing. Item 9.01 Financial Statements and Exhibits. (d) Exhibits 99. 1 Press Release issued by Western Digital Corporation on October 22 , 2026 announcing financial results for the fiscal first quarter ended October 2 , 2026. 104 Cover Page Interactive Data File (embedded within the Inline XBRL document). SIGNATURE 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. Western Digital Corporation (Registrant) By: /s/ Cynthia Tregillis Cynthia Tregillis Executive Vice President, Chief Legal Officer and Secretary Date: October 22, 2026