[Form 4] 374Water Inc. Insider Trading Activity

Rhea-AI Filing Summary

Peter Mandel, General Counsel of 374Water Inc. (SCWO), reported purchases of common stock on 08/18/2025 and 08/19/2025. The filings show he acquired 20 shares at $0.248 and 4,980 shares at $0.2498, totaling 5,000 shares purchased, resulting in 263,575 shares beneficially owned after the transactions.

Insights

Financial Analyst

TL;DR: Insider purchases of 5,000 shares by General Counsel, modest in size, signal personal buying but are not clearly material.

The Form 4 discloses two purchase transactions totaling 5,000 common shares on consecutive days at prices of $0.248 and $0.2498, increasing reported beneficial ownership to 263,575 shares. No derivative transactions or dispositions are reported. This is a straightforward disclosure of insider buying activity with no additional context on volume relative to float or timing.

Corporate Governance Expert

TL;DR: Officer reported routine insider purchases and properly filed a signed Form 4.

The filing identifies the reporting person as an officer (General Counsel) and is signed and dated 08/20/2025. Transaction codes indicate purchases on 08/18/2025 and 08/19/2025, and the form shows direct ownership. No amendments or complex arrangements are disclosed.

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
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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).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Mandel Peter

(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)
	General Counsel

3. Date of Earliest Transaction (Month/Day/Year)
08/18/2025

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
Common Stock	08/18/2025		P		20	A	$0.248	258,595	D
Common Stock	08/19/2025		P		4,980	A	$0.2498	263,575	D

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

Explanation of Responses:

	/s/ Peter Mandel	08/20/2025
	** 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

Who filed the Form 4 for 374Water Inc. (SCWO)?

The Form 4 was filed by Peter Mandel, who is identified as General Counsel and an officer of 374Water Inc.

How many shares did Peter Mandel purchase and on what dates?

He purchased a total of 5,000 common shares: 20 shares on 08/18/2025 at $0.248 and 4,980 shares on 08/19/2025 at $0.2498.

What was Peter Mandel's total beneficial ownership after the transactions?

Following the reported transactions, he beneficially owned 263,575 shares of 374Water Inc. common stock.

Were any derivative securities reported on this Form 4?

No. Table II for derivative securities contains no reported transactions or holdings in this filing.

When was the Form 4 signed?

The Form 4 was signed by Peter Mandel on 08/20/2025.