T1 Energy's Thomas Mahrer receives 25,000 shares

The first installment came from a 75,000-RSU award scheduled to vest in three equal annual installments.

Available on EDGAR 11/06/2026 - 06:27 PM EST Accepted by SEC EDGAR 11/06/2026 - 06:26 PM EST Learn about SEC filing dates

Rhea-AI Filing Summary

T1 Energy Inc. Chief Accounting Officer Thomas Mahrer had 25,000 RSUs vest and settle in common shares on November 4, 2026. Of those shares, 6,088 were withheld for tax obligations; Mahrer beneficially owned 18,912 common shares following the reported transactions. Another 50,000 RSUs remain outstanding, scheduled to vest in equal installments on November 4, 2027 and November 4, 2028.

Insider Trade Summary

25,000 shares exercised/converted

Exercise 3 txns

Insider Mahrer Thomas

Role Chief Accounting Officer

Type	Security	Shares	Price	Value
Exercise	Restricted Stock Units (RSUs) F1, F4	25,000	--	--
Exercise	Common Stock F1	25,000	$2.73	$68K
Tax Withholding	Common Stock F2, F3	6,088	$2.73	$17K

Holdings After Transaction: Restricted Stock Units (RSUs) — 50,000 contracts (Direct); Common Stock — 18,912 shares (Direct)

Footnotes (4)

1. F1. This transaction represents the vesting on November 4, 2026 of 25,000 Restricted Stock Units ("RSUs") granted on November 4, 2025 under the Company's 2021 Equity Incentive Plan (as amended and restated on April 22, 2024) and reported on the Form 3 filed February 13, 2026, as amended pursuant to Form 3/A filed on May 11, 2026. This relates to the vesting of the first of three equal annual installments (further details in Note 4 below). Each RSU represents the right to receive one share of Common Stock. These 25,000 RSUs were settled in shares of Common Stock on November 4, 2026.
2. F2. This transaction represents 6,088 shares of Common Stock withheld for tax obligations in connection with the settlement on November 4, 2026 of 25,000 RSUs that vested on November 4, 2026 (the first of three equal annual installments). The vesting of those 25,000 RSUs is described in Note 1 above.
3. F3. The 18,912 shares of Common Stock beneficially owned following the reported transactions reflects: (i) 25,000 shares acquired upon vesting of RSUs on November 4, 2026 (Note 1 above); less (v) 6,088 shares withheld for tax upon settlement of RSUs on November 4, 2026 (Note 2 above).
4. F4. The RSUs reported on the Form 3 filed February 13, 2026, as amended pursuant to Form 3/A filed on May 11, 2026, were granted for a total of 75,000 RSUs vesting in three equal annual installments: one-third vested on November 4, 2026; one-third will vest on November 4, 2027; and the remaining one-third will vest on November 4, 2028. Following the vesting and settlement of the first installment reported herein, 50,000 RSUs remain outstanding.

Key Figures

RSUs vested: 25,000 RSUs Shares withheld for tax obligations: 6,088 shares Common shares beneficially owned after reported transactions: 18,912 shares +2 more

5 metrics

RSUs vested 25,000 RSUs November 4, 2026

Shares withheld for tax obligations 6,088 shares Upon settlement of the RSUs on November 4, 2026

Common shares beneficially owned after reported transactions 18,912 shares Following the November 4, 2026 transactions

RSUs remaining outstanding 50,000 RSUs After the November 4, 2026 vesting and settlement

Reported price per share $2.73 per share Common-stock acquisition and tax-withholding transaction rows dated November 4, 2026

Key Terms

Restricted Stock Units (RSUs), settled in shares, beneficially owned

3 terms

Restricted Stock Units (RSUs) financial

"25,000 Restricted Stock Units (RSUs) granted"

Restricted stock units (RSUs) are a type of company promise to give employees shares of stock in the future, usually after certain conditions like working for a set time. They are like a gift promised today that you receive later, which can become valuable if the company's stock price goes up. RSUs matter because they are a way companies reward employees and can be a significant part of compensation.

settled in shares financial

"These 25,000 RSUs were settled in shares of Common Stock"

beneficially owned financial

"shares of Common Stock beneficially owned following the reported transactions"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

When do Thomas Mahrer's remaining TE RSUs vest?

The remaining 50,000 RSUs are scheduled to vest in two installments: one-third on November 4, 2027, and the remaining one-third on November 4, 2028. The original 75,000-RSU award was structured in three equal annual installments.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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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).

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^*

Mahrer Thomas

(Last) (First) (Middle)

1211 E 4TH ST.

(Street)

AUSTIN TEXAS 78702

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
T1 Energy Inc. [ TE ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
11/04/2026

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

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

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

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	11/04/2026		M		25,000(1)	A	$2.73	25,000	D
Common Stock	11/04/2026		F		6,088(2)	D	$2.73	18,912(3)	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
Restricted Stock Units (RSUs)	(1)	11/04/2026		M			25,000(4)	11/04/2026	(4)	Common Stock	25,000	(1)	50,000	D

Explanation of Responses:

1. This transaction represents the vesting on November 4, 2026 of 25,000 Restricted Stock Units ("RSUs") granted on November 4, 2025 under the Company's 2021 Equity Incentive Plan (as amended and restated on April 22, 2024) and reported on the Form 3 filed February 13, 2026, as amended pursuant to Form 3/A filed on May 11, 2026. This relates to the vesting of the first of three equal annual installments (further details in Note 4 below). Each RSU represents the right to receive one share of Common Stock. These 25,000 RSUs were settled in shares of Common Stock on November 4, 2026.

2. This transaction represents 6,088 shares of Common Stock withheld for tax obligations in connection with the settlement on November 4, 2026 of 25,000 RSUs that vested on November 4, 2026 (the first of three equal annual installments). The vesting of those 25,000 RSUs is described in Note 1 above.

3. The 18,912 shares of Common Stock beneficially owned following the reported transactions reflects: (i) 25,000 shares acquired upon vesting of RSUs on November 4, 2026 (Note 1 above); less (v) 6,088 shares withheld for tax upon settlement of RSUs on November 4, 2026 (Note 2 above).

4. The RSUs reported on the Form 3 filed February 13, 2026, as amended pursuant to Form 3/A filed on May 11, 2026, were granted for a total of 75,000 RSUs vesting in three equal annual installments: one-third vested on November 4, 2026; one-third will vest on November 4, 2027; and the remaining one-third will vest on November 4, 2028. Following the vesting and settlement of the first installment reported herein, 50,000 RSUs remain outstanding.

Remarks:

	/s/ Harold Callo Sanchez, as Attorney-in-Fact	11/05/2026
	** 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.
* Form 4: SEC 1474 (03-26)