X0609 4 2026-08-25 1 0001633978 Lumentum Holdings Inc. LITE 0001648256 Retort Vincent false C/O LUMENTUM HOLDINGS INC. 1001 RIDDER PARK DRIVE SAN JOSE CA 95131 false true false false SEE REMARKS 1 Common Stock 2026-08-25 4 S 0 360 842.2161 D 116743 D Common Stock 2026-08-25 4 S 0 1213 843.6014 D 115530 D Common Stock 2026-08-25 4 S 0 1053 844.6082 D 114477 D Common Stock 2026-08-25 4 S 0 631 845.6299 D 113846 D Common Stock 2026-08-25 4 S 0 2073 846.4448 D 111773 D Common Stock 2026-08-25 4 S 0 2121 847.516 D 109652 D Common Stock 2026-08-25 4 S 0 1102 848.6576 D 108550 D Common Stock 2026-08-25 4 S 0 1528 849.7055 D 107022 D Common Stock 2026-08-25 4 S 0 3017 850.6556 D 104005 D Common Stock 2026-08-25 4 S 0 4426 851.6762 D 99579 D Common Stock 2026-08-25 4 S 0 3711 852.6005 D 95868 D Common Stock 2026-08-25 4 S 0 2465 853.6179 D 93403 D Common Stock 2026-08-25 4 S 0 3486 854.8859 D 89917 D Common Stock 2026-08-25 4 S 0 800 855.8411 D 89117 D Common Stock 2026-08-25 4 S 0 4676 856.7089 D 84441 D Common Stock 2026-08-25 4 S 0 3511 857.95 D 80930 D Common Stock 2026-08-25 4 S 0 188 858.8163 D 80742 D Common Stock 2026-08-25 4 S 0 2302 860.052 D 78440 D These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 13, 2025. These sales were executed in multiple trades at prices ranging from $841.745 to $842.695. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide full information regarding the number of shares sold at each separate price, within the ranges set forth in footnotes (2) through (19) to this Form 4, upon request, to the staff of the Securities and Exchange Commission, the Issuer or a security holder of the Issuer. These sales were executed in multiple trades at prices ranging from $843.00 to $843.93. These sales were executed in multiple trades at prices ranging from $844.00 to $844.93. These sales were executed in multiple trades at prices ranging from $845.00 to $845.99. These sales were executed in multiple trades at prices ranging from $846.00 to $846.99. These sales were executed in multiple trades at prices ranging from $847.00 to $847.99. These sales were executed in multiple trades at prices ranging from $848.075 to $849.05. These sales were executed in multiple trades at prices ranging from $849.08 to $850.03. These sales were executed in multiple trades at prices ranging from $850.17 to $851.04. These sales were executed in multiple trades at prices ranging from $851.175 to $852.17. These sales were executed in multiple trades at prices ranging from $852.175 to $853.17. These sales were executed in multiple trades at prices ranging from $853.18 to $854.17. These sales were executed in multiple trades at prices ranging from $854.295 to $855.17. These sales were executed in multiple trades at prices ranging from $855.41 to $856.2725. These sales were executed in multiple trades at prices ranging from $856.46 to $857.43. These sales were executed in multiple trades at prices ranging from $857.53 to $858.51. These sales were executed in multiple trades at prices ranging from $858.595 to $859.42. These sales were executed in multiple trades at prices ranging from $859.99 to $860.83. Officer title: Executive Vice President, Global Reliability & Quality /s/ Jae Kim as Attorney-in-Fact 2026-08-27