Lightbridge CEO reports tax-withholding share transaction

Lightbridge Corporation President and CEO Seth Grae reported a tax‑withholding transaction involving 12,993 shares of common stock on December 15, 2025.

Rhea-AI Filing Summary

Lightbridge Corporation President and CEO Seth Grae reported a tax‑withholding transaction involving 12,993 shares of common stock on December 15, 2025. The shares were withheld to cover taxes due upon the vesting of restricted stock awards, and the company notes that no shares were sold in the market.

After this transaction, Grae directly beneficially owns 791,270 shares of Lightbridge common stock. He also holds fully vested employee stock options to purchase 7,937 shares at an exercise price of $12.60 per share expiring on October 26, 2027, and options for 18,199 shares at an exercise price of $18.48 per share expiring on November 9, 2026.

Insider Trade Summary

Exercise Price or Tax Liability: 12,993 shares

Exercise Price or Tax Liability 3 txns

Insider GRAE SETH

Role President and CEO

Type	Security	Shares	Price	Value
Exercise Price or Tax Liability	Common Stock	12,993	$14.49	$188K
holding	Employee Stock Option (right to buy)	--	--	--
holding	Employee Stock Option (right to buy)	--	--	--

Holdings After Transaction: Common Stock — 791,270 shares (Direct); Employee Stock Option (right to buy) — 26,136 contracts (Direct)

Footnotes (2)

1. F1. Shares withheld to cover taxes upon vesting of restricted stock awards. No shares were sold.
2. F2. This option is fully vested as of the date of this report.

FAQ

What insider transaction did Lightbridge (LTBR) CEO Seth Grae report on December 15, 2025?

On December 15, 2025, Seth Grae had 12,993 shares of Lightbridge common stock withheld to cover taxes upon the vesting of restricted stock awards.

How many Lightbridge (LTBR) shares does CEO Seth Grae own after this Form 4 transaction?

Following the reported transaction, Seth Grae directly beneficially owns 791,270 shares of Lightbridge common stock.

Were any Lightbridge (LTBR) shares sold in Seth Graes latest Form 4 filing?

No. The filing explains that the 12,993 shares were withheld to cover taxes when restricted stock awards vested, and that no shares were sold.

What stock options in Lightbridge (LTBR) does CEO Seth Grae hold?

Seth Grae holds fully vested employee stock options to buy 7,937 shares at $12.60 per share expiring on October 26, 2027, and 18,199 shares at $18.48 per share expiring on November 9, 2026.

Why were 12,993 Lightbridge (LTBR) shares withheld from Seth Grae?

The 12,993 shares were withheld to cover taxes due upon the vesting of restricted stock awards granted to Seth Grae.

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

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Accepted by SEC EDGAR 12/16/2025 - 04:31 PM Learn about SEC filing dates

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^*

GRAE SETH

(Last) (First) (Middle)

C/O LIGHTBRIDGE CORPORATION

11710 PLAZA AMERICA DRIVE, SUITE 2000

(Street)

RESTON VA 20190

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
LIGHTBRIDGE Corp [ LTBR ]

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

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President and CEO

3. Date of Earliest Transaction (Month/Day/Year)
12/15/2025

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	12/15/2025		F		12,993(1)	D	$14.49	791,270	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
Employee Stock Option (right to buy)	$12.6							(2)	10/26/2027	Common Stock	7,937		7,937	D
Employee Stock Option (right to buy)	$18.48							(2)	11/09/2026	Common Stock	18,199		18,199	D

Explanation of Responses:

1. Shares withheld to cover taxes upon vesting of restricted stock awards. No shares were sold.

2. This option is fully vested as of the date of this report.

	/s/ Seth Grae	12/16/2025
	** 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.