X0508 4 2025-03-14 0001274494 FIRST SOLAR, INC. FSLR 0002052277 Theurer Nathan B. C/O FIRST SOLAR, INC. 350 WEST WASHINGTON STREET, SUITE 600 TEMPE AZ 85288 1 VP - Global Controller and CAO 0 Common Stock 2025-03-14 4 M 0 131 0 A 342 D Common Stock 2025-03-17 4 S 0 35 133.75 D 307 D Restricted Stock Units 2025-03-14 4 M 0 131 0 D Common Stock 131 261 D Represents shares of common stock issued upon vesting of 20% of the restricted stock units granted on March 15, 2022. Represents shares of common stock sold by the Issuer to satisfy certain tax withholding obligations with the vesting of the restricted stock units. Each restricted stock unit represents the right to receive, upon vesting, one share of the Issuer's common stock in accordance with the Issuer's 2020 Omnibus Incentive Compensation Plan. The restricted stock units were granted on March 15, 2022 as part of the Issuer's annual equity grant to certain associates. The restricted stock units granted on March 15, 2022 vest annually at a rate of 20% on each anniversary of the grant date, commencing on the first anniversary of the grant date. /s/ Jason E. Dymbort, attorney-in-fact 2025-03-18