Lumentum Holdings Inc. announced that on December 29, 2025, Matthew Sepe, Chief Accounting Officer and Senior Vice President, Finance, informed the Company of his planned retirement from the Company. Mr. Sepe will serve as the Company's Senior Vice President, Finance until his retirement in fall 2026 and will step down as the Company's Chief Accounting Officer effective as of the later of February 6, 2026 and the date upon which the Company files its Quarterly Report on Form 10-Q for the three months ended December 27, 2025. In connection with Mr. Sepe's retirement, the Board has appointed Eric Chang, who recently joined the Company as Senior Vice President, Finance, as Chief Accounting Officer effective upon the Effective Date.

Mr. Chang, age 52, the Company's Senior Vice President, Finance, most recently served as Chief Financial Officer of Digilens Inc., from July 2025 until November 2025. Prior to joining Digilens, Mr. Chang served as VP, Chief Accounting Officer of Edgio Inc. from October 2022 until June 2025. Prior to Edgio, Mr. Chang served as VP, Finance and Accounting of Summit Interconnect Inc. from January 2022 until October 2022.

Prior to joining Summit Interconnect, Mr. Chang served as Senior Vice President, Chief Financial Officer and Principal Accounting Officer of Aviat Networks Inc. from February 2016 until October 2021. Mr. Chang also served as Senior Director, Corporate Controller at Micrel, Incorporated, from November 2013 to February 2016, and as Senior Director, Assistant Corporate Controller and Memory Business Unit Controller at Atmel Corporation, from June 2007 to November 2013. Earlier in his career, Mr. Chang served as a Senior Manager at Ernst & Young LLP and as a Senior Associate at PricewaterhouseCoopers LLP, planning, administering and managing audit engagements of public companies in the high-tech industry and performing technical research of accounting, Sarbanes-Oxley Section 404, financial statements presentation and disclosure issues in accordance with US GAAP and SEC requirements.

Mr. Chang holds a B.S. in Accounting and Computer Information Systems from Indiana University and is a certified public accountant.