SCWO

SEC source: 0001654954-25-007400 · section16.xml · nonDerivative · entry 1

Nagar Yaacov · CIK 0001861377 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,181,237

F2 · shares: This Form 4 amends the Form 4 filed on 6/18/2025 to correct the amount of common stock sold. The number of common stock sold was inadvertently reported as 57,650 shares; the correct amount of common stock sold was 51,598.

F1 · price: This transaction was executed in multiple trades at prices ranging from $0.400 to $0.402 The price set forth above reflects the weighted-average price per share. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

SEC source: 0001654954-25-007202 · section16.xml · nonDerivative · entry 1

Nagar Yaacov · CIK 0001861377 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,232,835

SEC source: 0001654954-25-007051 · section16.xml · nonDerivative · entry 1

Nagar Yaacov · CIK 0001861377 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,238,887

F1 · price: This transaction was executed in multiple trades at prices ranging from $0.400 to $0.403. The price set forth above reflects the weighted-average price per share. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

SEC source: 0001654954-25-006640 · section16.xml · nonDerivative · entry 1

Jones Stephen J · CIK 0001412239 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 179,593

SEC source: 0001654954-25-006519 · section16.xml · nonDerivative · entry 1

Jones Stephen J · CIK 0001412239 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 139,593

F1 · price: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.42 to $0.4247, inclusive. The reporting person undertakes to provide to 374Water Inc., any security holder of 374Water Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote (1) to this Form 4.

SEC source: 0001654954-25-006140 · section16.xml · nonDerivative · entry 1

Jones Stephen J · CIK 0001412239 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 89,593

SEC source: 0001654954-25-006045 · section16.xml · nonDerivative · entry 1

Jones Stephen J · CIK 0001412239 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,593

F1 · shares: The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $0.30 to $0.32, inclusive. The reporting person undertakes to provide to 374Water Inc., any security holder of 374Water Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in footnote (1) to this Form 4.

SEC source: 0001654954-25-010347 · section16.xml · derivative · entry 2

Meyers Brad Ian · CIK 0002000149 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 115,500

Underlying: Common Stock, $0.0001 par value · 115,500 shares

Expires not disclosed

F1 · shares: The Restricted Stock Units (the "RSU") reported herein were granted to the Reporting Person May 16, 2024 (the "Effective Date") pursuant to his Employment Agreement (the "Employment Agreement"). The RSU grants consisted of an RSU for 115,500 shares that vest over time (the "Time RSU") and an RSU for 115,500 shares that vest on the achievement of certain milestones (the "Performance RSU"). 28,875 of the shares subject to the Time RSU vested on May 16, 2025, and the remaining 86,625 shares vest in equal increments on the last day of every month thereafter over the following 36 months, subject to the Reporting Person's continued employment with the Issuer on each vesting date. As of September 2, 2025, 36,093 shares subject to the Time RSU were vested, and 79,407 shares are unvested.

F3 · derivative.exercise_date: Under the Employment Agreement, the Reporting Person was granted the Performance RSU, that vest pursuant to certain milestones set forth by the Issuer.

F3 · derivative.expiration_date: Under the Employment Agreement, the Reporting Person was granted the Performance RSU, that vest pursuant to certain milestones set forth by the Issuer.

F2 · balance_after: On May 22, 2024, the Reporting Person filed a Form 4 that reported both the Time RSU and the Performance RSU in Table II. This amendment serves to remove the Time RSU from Table II and report it in Table I.

SEC source: 0001654954-25-010347 · section16.xml · nonDerivative · entry 1

Meyers Brad Ian · CIK 0002000149 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 115,500

F1 · shares: The Restricted Stock Units (the "RSU") reported herein were granted to the Reporting Person May 16, 2024 (the "Effective Date") pursuant to his Employment Agreement (the "Employment Agreement"). The RSU grants consisted of an RSU for 115,500 shares that vest over time (the "Time RSU") and an RSU for 115,500 shares that vest on the achievement of certain milestones (the "Performance RSU"). 28,875 of the shares subject to the Time RSU vested on May 16, 2025, and the remaining 86,625 shares vest in equal increments on the last day of every month thereafter over the following 36 months, subject to the Reporting Person's continued employment with the Issuer on each vesting date. As of September 2, 2025, 36,093 shares subject to the Time RSU were vested, and 79,407 shares are unvested.

SEC source: 0001654954-25-005061 · section16.xml · derivative · entry 2

Melkote Rajesh Ramaswamy · CIK 0002064133 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 757,756

Underlying: Common Stock · 757,576 shares

Expires 2035-04-29

F1 · shares: Vesting commencement date is March 31, 2025. 25% of the shares vest and become exercisable on the first annual anniversary of the vesting commencement date and the balance vest and become exercisable equally on the last day of every month thereafter over the following 36 months, subject to the Reporting Person's continuous service through each vesting date.

F1 · derivative.exercise_date: Vesting commencement date is March 31, 2025. 25% of the shares vest and become exercisable on the first annual anniversary of the vesting commencement date and the balance vest and become exercisable equally on the last day of every month thereafter over the following 36 months, subject to the Reporting Person's continuous service through each vesting date.

SEC source: 0001654954-25-005061 · section16.xml · nonDerivative · entry 1

Melkote Rajesh Ramaswamy · CIK 0002064133 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 757,756

F1 · shares: Vesting commencement date is March 31, 2025. 25% of the shares vest and become exercisable on the first annual anniversary of the vesting commencement date and the balance vest and become exercisable equally on the last day of every month thereafter over the following 36 months, subject to the Reporting Person's continuous service through each vesting date.

SEC source: 0001654954-25-003564 · section16.xml · nonDerivative · entry 2

Nagar Yaacov · CIK 0001861377 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,281,237

SEC source: 0001654954-25-003564 · section16.xml · nonDerivative · entry 1

Nagar Yaacov · CIK 0001861377 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,342,462

SEC source: 0001654954-25-001360 · section16.xml · nonDerivative · entry 1

Nagar Yaacov · CIK 0001861377 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,388,460

SEC source: 0001654954-25-001255 · section16.xml · nonDerivative · entry 1

Nagar Yaacov · CIK 0001861377 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,400,896

SEC source: 0001654954-25-001175 · section16.xml · nonDerivative · entry 2

Nagar Yaacov · CIK 0001861377 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,545,756

SEC source: 0001654954-25-001175 · section16.xml · nonDerivative · entry 1

Nagar Yaacov · CIK 0001861377 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,561,675

SEC source: 0001654954-25-000768 · section16.xml · nonDerivative · entry 2

Nagar Yaacov · CIK 0001861377 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,773,795

SEC source: 0001654954-25-000768 · section16.xml · nonDerivative · entry 1

Nagar Yaacov · CIK 0001861377 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,774,695

SEC source: 0001654954-25-000660 · section16.xml · nonDerivative · entry 2

Nagar Yaacov · CIK 0001861377 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,805,720

SEC source: 0001654954-25-000660 · section16.xml · nonDerivative · entry 1

Nagar Yaacov · CIK 0001861377 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,825,492

SEC source: 0001654954-25-000553 · section16.xml · nonDerivative · entry 2

Nagar Yaacov · CIK 0001861377 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,861,882

F1 · price: This transaction was executed in multiple trades at prices ranging from $0.606 to $0.593. The price set forth above reflects the weighted-average price per share. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected

SEC source: 0001654954-25-000553 · section16.xml · nonDerivative · entry 1

Nagar Yaacov · CIK 0001861377 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,976,880

SEC source: 0001654954-25-000492 · section16.xml · nonDerivative · entry 2

Nagar Yaacov · CIK 0001861377 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,977,180

SEC source: 0001654954-25-000547 · section16.xml · derivative · entry 2

Russell Kline · CIK 0002049257 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 308,642

Underlying: Common Stock · 308,642 shares

Expires 2025-01-14

F1 · shares: Vesting commencement date is December 16, 2024. 25% of the shares vest and become exercisable on the first annual anniversary of the vesting commencement date and the balance vest and become exercisable equally on the last day of every month thereafter over the following 36 months, subject to the Reporting Person's continuous service through each vesting date.

F1 · derivative.exercise_date: Vesting commencement date is December 16, 2024. 25% of the shares vest and become exercisable on the first annual anniversary of the vesting commencement date and the balance vest and become exercisable equally on the last day of every month thereafter over the following 36 months, subject to the Reporting Person's continuous service through each vesting date.

SEC source: 0001654954-25-000547 · section16.xml · nonDerivative · entry 1

Russell Kline · CIK 0002049257 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 348,642

F1 · shares: Vesting commencement date is December 16, 2024. 25% of the shares vest and become exercisable on the first annual anniversary of the vesting commencement date and the balance vest and become exercisable equally on the last day of every month thereafter over the following 36 months, subject to the Reporting Person's continuous service through each vesting date.

SEC source: 0001654954-25-000492 · section16.xml · nonDerivative · entry 1

Nagar Yaacov · CIK 0001861377 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,989,484

SEC source: 0001654954-25-000375 · section16.xml · nonDerivative · entry 1

Nagar Yaacov · CIK 0001861377 · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,050,752

F1 · price: This transaction was executed in multiple trades at prices ranging from $0.673 to $0.697. The price set forth above reflects the weighted-average price per share. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected

SEC source: 0001654954-25-000063 · section16.xml · derivative · entry 5

DAVIS RICHARD H · CIK 0001429114 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,700,000

Underlying: Common Stock · 1,000,000 shares

Expires 2026-06-30

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001654954-25-000063 · section16.xml · nonDerivative · entry 2

DAVIS RICHARD H · CIK 0001429114 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,143,793

SEC source: 0001654954-25-000063 · section16.xml · nonDerivative · entry 1

DAVIS RICHARD H · CIK 0001429114 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,322,898

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: Represents a fully vested stock option, which was exercised in connection with tax planning purposes and for which the exercise price was paid through the withholding of exercised shares. The Reporting Person intends to hold the shares until at least May 2025 pursuant to a lock-up agreement and the Issuer's insider trading policy.

SEC source: 0000950170-24-128992 · ownership.xml · derivative · entry 2

Deshusses Marc · CIK 0001860685 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 48,000

Underlying: Common Stock · 48,000 shares

Expires 2029-11-17

F1 · price: The purchase price for each share of Common Stock reported in Table I and the accompanying warrants was $1.25.

SEC source: 0000950170-24-128992 · ownership.xml · nonDerivative · entry 1

Deshusses Marc · CIK 0001860685 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,652,451

F1 · price: The purchase price for each share of Common Stock reported in Table I and the accompanying warrants was $1.25.

SEC source: 0000950170-24-128990 · ownership.xml · derivative · entry 3

Penn Buddie J · CIK 0001673602 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,000

Underlying: Common Stock · 30,000 shares

Expires 2029-11-17

F2 · price: The purchase price for each share of the 20,000 shares of Common Stock reported in Table I and the accompanying warrants was $1.25.

SEC source: 0000950170-24-128990 · ownership.xml · nonDerivative · entry 2

Penn Buddie J · CIK 0001673602 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 60,000

F2 · price: The purchase price for each share of the 20,000 shares of Common Stock reported in Table I and the accompanying warrants was $1.25.

SEC source: 0000950170-24-128981 · ownership.xml · derivative · entry 5

Anderson Adrienne · CIK 0001962594 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,000

Underlying: Common Stock · 15,000 shares

Expires 2029-11-17

F3 · price: The purchase price for each share of the 10,000 shares of Common Stock reported in Table I and the accompanying warrants was $1.25.

SEC source: 0000950170-24-128981 · ownership.xml · nonDerivative · entry 3

Anderson Adrienne · CIK 0001962594 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 71,762

F3 · price: The purchase price for each share of the 10,000 shares of Common Stock reported in Table I and the accompanying warrants was $1.25.

SEC source: 0000950170-24-128979 · ownership.xml · derivative · entry 3

Vanderhider James Michael · CIK 0001935169 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 375,000

Underlying: Common Stock · 375,000 shares

Expires 2029-11-17

F2 · price: The purchase price for each share of the 250,000 shares of Common Stock reported in Table I and the accompanying warrants was $1.25.

F3 · ownership.nature: All 1,420,000 shares and the warrant to purchase 375,000 shares are owned and held by Aspen View LP. The Reporting Person has sole voting and dispositive power over the securities held by Aspen View LP.

SEC source: 0000950170-24-128979 · ownership.xml · nonDerivative · entry 2

Vanderhider James Michael · CIK 0001935169 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 1,420,000

F2 · price: The purchase price for each share of the 250,000 shares of Common Stock reported in Table I and the accompanying warrants was $1.25.

F3 · ownership.nature: All 1,420,000 shares and the warrant to purchase 375,000 shares are owned and held by Aspen View LP. The Reporting Person has sole voting and dispositive power over the securities held by Aspen View LP.

SEC source: 0000950170-24-128978 · ownership.xml · derivative · entry 3

Estes Deanna Rene · CIK 0001935149 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,000

Underlying: Common Stock · 36,000 shares

Expires 2029-11-17

F2 · price: The purchase price for each share of the 24,000 shares of Common Stock reported in Table I and the accompanying warrants was $1.25.

SEC source: 0000950170-24-128978 · ownership.xml · nonDerivative · entry 2

Estes Deanna Rene · CIK 0001935149 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 76,500

F2 · price: The purchase price for each share of the 24,000 shares of Common Stock reported in Table I and the accompanying warrants was $1.25.

SEC source: 0000950170-24-128977 · ownership.xml · derivative · entry 4

Mandel Peter · CIK 0002035922 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,200

Underlying: Common Stock · 16,200 shares

Expires 2029-11-17

F2 · price: The purchase price for each share of the 10,800 shares of Common Stock reported in Table I and the accompanying warrants was $1.25.

SEC source: 0000950170-24-128977 · ownership.xml · derivative · entry 3

Mandel Peter · CIK 0002035922 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 247,775

Underlying: Common Stock · 247,775 shares

Expires 2034-11-17

F1 · shares: Vesting commencement date is August 19, 2024. 25% of the shares vest and become exercisable on the first annual anniversary of the vesting commencement date and the balance vest and become exercisable equally on the last day of every month thereafter over the following 36 months, subject to the Reporting Person's continuous service through each vesting date.

F1 · derivative.exercise_date: Vesting commencement date is August 19, 2024. 25% of the shares vest and become exercisable on the first annual anniversary of the vesting commencement date and the balance vest and become exercisable equally on the last day of every month thereafter over the following 36 months, subject to the Reporting Person's continuous service through each vesting date.

SEC source: 0000950170-24-128977 · ownership.xml · nonDerivative · entry 2

Mandel Peter · CIK 0002035922 · General Counsel

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 258,575

F2 · price: The purchase price for each share of the 10,800 shares of Common Stock reported in Table I and the accompanying warrants was $1.25.

SEC source: 0000950170-24-129140 · ownership.xml · derivative · entry 2

Gannon Chris M · CIK 0001645284 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 180,000

Underlying: Common Stock · 180,000 shares

Expires 2029-11-17

F1 · price: The purchase price for each share of Common Stock reported in Table I and the accompanying warrants was $1.25.

SEC source: 0000950170-24-129140 · ownership.xml · nonDerivative · entry 1

Gannon Chris M · CIK 0001645284 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 120,000

F1 · price: The purchase price for each share of Common Stock reported in Table I and the accompanying warrants was $1.25.

SEC source: 0000950170-24-130713 · ownership.xml · derivative · entry 4

DAVIS RICHARD H · CIK 0001429114 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By spouse

Disclosed balance after: 60,000

Underlying: Common Stock · 60,000 shares

Expires 2029-11-17

F2 · price: The purchase price for each share of the 40,000 shares of Common Stock reported in Table I and the accompanying warrants was $1.25

SEC source: 0000950170-24-130713 · ownership.xml · nonDerivative · entry 2

DAVIS RICHARD H · CIK 0001429114 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By spouse

Disclosed balance after: 160,533

F2 · price: The purchase price for each share of the 40,000 shares of Common Stock reported in Table I and the accompanying warrants was $1.25

SEC source: 0000950170-24-128990 · ownership.xml · nonDerivative · entry 1

Penn Buddie J · CIK 0001673602 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,000

F1 · shares: Fully vested on date of grant.

SEC source: 0000950170-24-128989 · ownership.xml · nonDerivative · entry 1

Merrell Terry · CIK 0001890572 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,000

F1 · shares: Fully vested on date of grant.