X0206 3 2022-06-13 0 0000933972 374Water Inc. SCWO 0001673602 Penn Buddie J C/O 374WATER INC. 701 W. MAIN STREET, SUITE 410 DURHAM NC 27701 true Option to Purchase Common Stock 3 Common Stock 20000 D This option to purchase common stock was granted on June 13, 2022 and vests in four equal quarterly share installments. Reporting Person must be a member of the Board of Directors of the Issuer as of each vesting date. This option expires on June 12, 2032. /s/ B.J. Penn 2022-06-23