# EDGAR Filing Document

**Accession Number:** 0000933972
**File Stem:** 0001654954-26-001681
**Filing Date:** 2026-2
**Character Count:** 8637
**Document Hash:** 112da1cfdf0cfadad9b61d172d31ec47
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001654954-26-001681.hdr.sgml**: 20260227

**ACCESSION NUMBER**: 0001654954-26-001681

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20260209

**FILED AS OF DATE**: 20260227

**DATE AS OF CHANGE**: 20260227

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** McKnight Stephen H.
- **CENTRAL INDEX KEY:** 0002114378

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-41420
- **FILM NUMBER:** 26701600

**MAIL ADDRESS:**
- **STREET 1:** 100 SOUTHCENTER COURT
- **STREET 2:** SUITE 2000
- **CITY:** MORRISVILLE
- **STATE:** NC
- **ZIP:** 27560
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** 374Water Inc.
- **CENTRAL INDEX KEY:** 0000933972
- **STANDARD INDUSTRIAL CLASSIFICATION:** MOTORS & GENERATORS [3621]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 880271109
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 701 W. MAIN STREET
- **STREET 2:** SUITE 410
- **CITY:** DURHAM
- **STATE:** NC
- **ZIP:** 27701
- **BUSINESS PHONE:** 440-609-9677

**MAIL ADDRESS:**
- **STREET 1:** 3710 SHANNON RD #51877
- **STREET 2:** SUITE 410
- **CITY:** DURHAM
- **STATE:** NC
- **ZIP:** 27717

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** POWERVERDE, INC.
- **DATE OF NAME CHANGE:** 20080820

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** VYREX CORP
- **DATE OF NAME CHANGE:** 19951206

## Ex-24

**POWER OF ATTORNEY**

The undersigned, as a Section 16 reporting person of 374Water Inc. (the "Company"), hereby constitutes and appoints each of Russell Kline, Meaghan Nelson and Sabina Wahl, or any of them acting singly, and with full power of substitution and re-substitution, the undersigned's true and lawful attorney-in-fact (each of such persons and their substitutes being referred to herein as the "Attorney-in-Fact") to:

(1) execute,
deliver and file for and on behalf of the undersigned, in the
undersigned's capacity as an officer and/or director of the
Company, Forms 3, 4, and 5 in accordance with
Section 16(a) of the Securities Exchange Act of 1934 (the
"Exchange Act");

(2) do and
perform any and all acts for and on behalf of the undersigned which
may be necessary or desirable to complete and execute any such
Form 3, 4, or 5, complete and execute any amendment or
amendments thereto, and timely file such form with the Securities
and Exchange Commission ("SEC") and any stock exchange
or similar authority;

(3) seek or
obtain, as the undersigned's representative and on the
undersigned's behalf, information on transactions in the
Company's securities from any third party, including brokers,
employee benefit plan administrators and trustees, and the
undersigned hereby authorizes any such person to release any such
information to the undersigned and approves and ratifies any such
release of information; and

(4) take
any other action of any type whatsoever in connection with the
foregoing which, in the opinion of such Attorney-in-Fact, may be of
benefit to, in the best interest of, or legally required by, the
undersigned, it being understood that the documents executed by
such Attorney-in-Fact on behalf of the undersigned pursuant to this
Power of Attorney shall be in such form and shall contain such
terms and conditions as such Attorney-in-Fact may approve in such
Attorney-in-Fact's discretion.

The undersigned hereby grants to each such Attorney-in-Fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such Attorney-in-Fact shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers herein granted. The undersigned acknowledges that the foregoing Attorneys-in-Fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigned's responsibilities to comply with Section 16 of the Exchange Act. The undersigned further acknowledges and agrees that the Attorney-in-Fact and the Company are relying on written and oral information provided by the undersigned to complete such forms and the undersigned is responsible for reviewing the completed forms prior to their filing. The Attorney-in-Fact and the Company are not responsible for any errors or omissions in such filings. The Attorney-in-Fact and the Company are not responsible for determining whether or not the transactions reported could be matched with any other transactions for the purpose of determining liability for short-swing profits under Section 16(b).

This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4, and 5 with respect to the undersigned's holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the Company and the foregoing Attorneys-in-Fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 18th day of February, 2026.

---

| |
|:---|
| /s/ Stephen H. McKnight |
| Signature<br>|
| Stephen H. McKnight |
| Print Name |

---

152179423.1 0085180-00001

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

## FORM 3

### INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

[ ] 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**<sup>*</sup><br>McKnight Stephen H.<br><sub>(Last) (First) (Middle)</sub><br>C/O 374WATER INC.<br>100 SOUTHCENTER COURT, SUITE 200<br><sub>(Street)</sub><br>MORRISVILLE, NC 27560<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>374Water Inc. [ SCWO ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2026-02-09 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director   [ ] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities Beneficially Owned

---

|  |  |  |  |
| --- | --- | --- | --- |
| 1. Title of Security | 2. Amount of Securities Beneficially Owned | 3. Ownership Form | 4. Nature of Indirect Beneficial Ownership |
| Common Stock | 190000 | D |  |
| Common Stock | 1500 | I | By the Stephen H. McKnight Revocable Trust, of which the Reporting Person is the sole trustee. |

---

## Table II - Derivative Securities Beneficially Owned

---

|  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Underlying Securities | 3. Title and Amount of Underlying Securities | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| Warrants (right to buy) | 2024-11-18 | 2029-11-17 | Common Stock | 12000 | $1.9352 | D |  |

---

**Remarks:**
Exhibit 24.1 Power of Attorney

**Signature:** /s/ Stephen H. McKnight  
**Date:** 2026-02-18

### Remarks:

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.**