# EDGAR Filing Document

**Accession Number:** 0002108547
**File Stem:** 0001213900-26-054607
**Filing Date:** 2026-5
**Character Count:** 7042
**Document Hash:** a67a2068d470a5732d03588648d68bb7
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001213900-26-054607.hdr.sgml**: 20260511

**ACCESSION NUMBER**: 0001213900-26-054607

**CONFORMED SUBMISSION TYPE**: 3/A

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260205

**FILED AS OF DATE**: 20260511

**DATE AS OF CHANGE**: 20260511

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Mahrer Thomas
- **CENTRAL INDEX KEY:** 0002108547

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-41903
- **FILM NUMBER:** 26964707

**MAIL ADDRESS:**
- **STREET 1:** 1211 E 4TH STREET
- **CITY:** AUSTIN
- **STATE:** TX
- **ZIP:** 78702

**FORMER NAME:**
- **FORMER CONFORMED NAME:** Thomas Mahrer
- **DATE OF NAME CHANGE:** 20260130
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** T1 Energy Inc.
- **CENTRAL INDEX KEY:** 0001992243
- **STANDARD INDUSTRIAL CLASSIFICATION:** SEMICONDUCTORS & RELATED DEVICES [3674]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 933205861
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 1211 E 4TH ST.
- **CITY:** AUSTIN
- **STATE:** TX
- **ZIP:** 78702
- **BUSINESS PHONE:** 409-599-5706

**MAIL ADDRESS:**
- **STREET 1:** 1211 E 4TH ST.
- **CITY:** AUSTIN
- **STATE:** TX
- **ZIP:** 78702

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** FREYR Battery, Inc. /DE/
- **DATE OF NAME CHANGE:** 20230901

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

## FORM 3/A

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] 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**<sup>*</sup><br>Mahrer Thomas<br><sub>(Last) (First) (Middle)</sub><br>1211 E 4TH ST.<br><sub>(Street)</sub><br>AUSTIN, TX 78702<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-02-05 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_Chief Accounting Officer_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>T1 Energy Inc. [ TE ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<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

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |  |  |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Restricted Stock Units (RSUs) | 0<sup>(3)</sup> |  |  |  |  |  |  | <sup>(1)</sup> | <sup>(1)</sup> | Common Stock | 75000 |  |  | D |  |
| Restricted Stock Units (RSUs) | 0<sup>(3)</sup> |  |  |  |  |  |  | <sup>(2)</sup> | <sup>(2)</sup> | Common Stock | 12670 |  |  | D |  |

---

### Footnotes:

(1) Consists of restricted stock units ("RSUs") granted on November 4, 2025 under the T1 Energy 2021 Equity Incentive Plan (amended and restated as of April 22, 2024, the "Plan")). The RSUs vest in three equal annual installments, one-third (1/3) on November 4, 2026, one-third (1/3) on November 4, 2027 and one-third (1/3) on November 4, 2028. The RSUs are net settled in shares of Common Stock.

(2) Consists of RSUs granted on January 29, 2026 under the Plan. The RSUs vest in three equal annual installments, one-third (1/3) on January 29, 2027, one-third (1/3) on January 29, 2028 and one-third (1/3) on January 29, 2029. The RSUs are net settled in shares of Common Stock.

(3) Each RSU represents a right to receive one share of Common Stock upon settlement.

**Remarks:**
Relationship of Reporting Person to Issuer - Chief Accounting Officer and Corporate Controller. This Amendment No. 1 to the Form 3 originally filed on February 13, 2026 is being filed to report an additional grant of 12,670 restricted stock units beneficially owned by the Reporting Person as of February 5, 2026, that was inadvertently omitted from the original Form 3. Exhibit List: Exhibit 24.1 - Power of Attorney.

**Signature:** /s/ Harold Callo Sanchez, as Attorney-in-Fact  
**Date:** 2026-05-11

### 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.**