Insider Transaction Report for 374Water Inc.

Charles Maurice Weiser, Chief Financial Officer and Director of 374Water Inc., reported a significant transaction on July 1, 2026. Weiser acquired 150,000 stock options, exercisable at $0.00, with an underlying value tied to 150,000 shares of Common Stock. These options, granted under the 374Water Inc. 2021 Equity Incentive Plan, vest over time, with 25% vesting immediately and the remainder vesting in 12 quarterly installments starting October 1, 2026. Additionally, Weiser was granted 125,000 Restricted Stock Units (RSUs) with a $0.00 price per share, also linked to Common Stock. The RSUs follow a similar vesting schedule: 25% on the grant date and the rest in 12 quarterly installments beginning October 1, 2026. The exercise price for the stock options is noted as $2.16, and the RSUs have an exercise price of $0.00. These transactions were reported on July 8, 2026.