Form 4: 374Water CFO option grant; total derivatives now 808,642

Rhea-AI Filing Summary

374Water (SCWO) reported a Form 4 for its Chief Financial Officer, showing a grant of 500,000 stock options on 10/09/2025 at an exercise price of $0.6 per share. The filing lists 808,642 derivative securities beneficially owned after the transaction.

According to the award terms, 50% of the options vest on the first anniversary of the grant date and the remaining 50% vest on the second anniversary, subject to continued service. Unvested options fully vest upon an involuntary termination without cause. The options expire ten years from the grant date, unless terminated earlier under the grant agreement.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Russell Kline

Role Chief Financial Officer

Type	Security	Shares	Price	Value
Grant/Award	Stock options (right to buy)	500,000	$0.00	--

Holdings After Transaction: Stock options (right to buy) — 808,642 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person^*

Russell Kline

(Last) (First) (Middle)

C/O 374 WATER INC.

100 SOUTHCENTER COURT SUITE 200

(Street)

MORRISVILLE NC 27560

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
374Water Inc. [ SCWO ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
10/09/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock options (right to buy)(1)	$0.6	10/09/2025		A		500,000(1)		(1)	(1)	Common Stock	500,000(1)	$0	808,642	D

Explanation of Responses:

1. . Represents stock options granted to the Reporting Person as a special retention incentive award in connection with his continued service as Chief Financial Officer of 374Water Inc. (the "Company"). 50% of the stock options vest and become exercisable on the first anniversary of the grant date and the remaining 50% of the stock options vest and become exercisable on the second anniversary of the grant date, subject to the Reporting Person's continuous service through each vesting date. In the event of an involuntary termination of the Reporting Person without cause, all remaining unvested stock options will vest and become exercisable immediately. Upon vesting, each stock option gives the Reporting Person the right to purchase one share of the Company's Common Stock at the exercise price. The stock options expire on the date which is ten years from the grant date, unless earlier terminated in accordance with the stock option grant agreement.

	/s/ Russell Kline	10/14/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did 374Water (SCWO) disclose in the Form 4?

A grant of 500,000 stock options to the Chief Financial Officer on 10/09/2025 at an exercise price of $0.6 per share.

What is the vesting schedule for the SCWO CFO’s options?

50% vest on the first anniversary of the grant date and the remaining 50% on the second anniversary, subject to continued service.

Do the options have acceleration provisions?

Yes. Upon an involuntary termination without cause, all remaining unvested options vest immediately.

When do the options expire?

They expire ten years from the grant date, unless earlier terminated under the grant agreement.

How many derivative securities does the CFO hold after this grant?

The filing lists 808,642 derivative securities beneficially owned after the reported transaction.

What ownership form is shown for the reported derivatives?

The options are reported as Direct (D) ownership.