LITE: Financial results

Item 2.02. Results of Operations and Financial Condition. On August 11, 2026 , Lumentum Holdings Inc. (the “Company”) reported results for its fourth quarter and full fiscal year ended June 27, 2026. The Company also posted a slide presentation entitled “Q4 FY26 Conference Call” dated August 11, 2026 on the “Events and Presentations” investor section of its website (www.lumentum.com). A copy of the Company’s press release is furnished herewith as Exhibit 99.1. Information on the Company’s website is not, and will not be deemed to be, a part of this Current Report on Form 8-K or incorporated into any other filings the Company may make with the Securities and Exchange Commission. The information in this Current Report on Form 8-K, including Exhibit 99.1, is intended to be furnished and shall not be deemed “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, nor shall it be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing. Item 9.01. Financial Statements and Exhibits. (d) Exhibits. Exhibit No. Description 99.1 Press release entitled “Lumentum Announces Fourth Quarter and Full Fiscal Year 2026 Results” dated August 11, 2026. 104 Cover Page Interactive Data File (formatted as Inline XBRL) 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 hereunto duly authorized. LUMENTUM HOLDINGS INC. By: /s/ Wajid Ali Name: Wajid Ali Title: Chief Financial Officer August 11, 2026