[Form 4] 374Water Inc. Insider Trading Activity

Rhea-AI Filing Summary

374Water Inc. (SCWO) reported a Form 4 showing its Chief Operating Officer received a grant of 500,000 stock options on 10/09/2025 at an exercise price of $0.60 per share.

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. The options have a 10-year term from the grant date, with acceleration upon involuntary termination without cause.

Following the transaction, the reporting person beneficially owned 731,000 derivative securities, held directly.

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

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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^*

Meyers Brad Ian

(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 Operating 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	731,000	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 Operating 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/ Brad Ian Meyers	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 this Form 4?

A grant of 500,000 stock options to the Chief Operating Officer on 10/09/2025 at an exercise price of $0.60 per share.

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

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

What is the term of the newly granted options at 374Water?

The options expire 10 years from the grant date, unless terminated earlier under the grant agreement.

Is there any acceleration feature for the SCWO options?

Yes. If involuntarily terminated without cause, all remaining unvested options vest immediately.

How many derivative securities does the reporting person hold after this grant?

The reporting person beneficially owned 731,000 derivative securities following the transaction.

Who signed the Form 4 for 374Water (SCWO)?

The form was signed by /s/ Brad Ian Meyers.