Lightbridge CEO has 10,930 shares withheld for taxes

LIGHTBRIDGE Corp (LTBR) reported that President and CEO Seth Grae had 10,930 shares of common stock withheld on 2026-08-28 to pay tax liabilities upon vesting of restricted stock awards at a reference value of $7.55 per share.

Rhea-AI Filing Summary

LIGHTBRIDGE Corp (LTBR) reported that President and CEO Seth Grae had 10,930 shares of common stock withheld on 2026-08-28 to pay tax liabilities upon vesting of restricted stock awards at a reference value of $7.55 per share. A footnote states that no shares were sold in the market, and his directly owned common stock holdings after this withholding were 872,084 shares. He also holds fully vested employee stock options covering 7,937 shares at an exercise price of $12.60 per share expiring on 2027-10-26 and options covering 18,199 shares at an exercise price of $18.48 per share expiring on 2026-11-09.

Insider Trade Summary

Tax Withholding: 10,930 shares

Tax Withholding 3 txns

Insider GRAE SETH

Role President and CEO

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock F1	10,930	$7.55	$83K
holding	Employee Stock Option (right to buy) F2	--	--	--
holding	Employee Stock Option (right to buy) F2	--	--	--

Holdings After Transaction: Common Stock — 872,084 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.

Key Figures

Shares withheld for taxes: 10,930 shares Reference value per share for tax withholding: $7.55 per share Shares owned after transaction: 872,084 shares +4 more

7 metrics

Shares withheld for taxes 10,930 shares Shares of common stock withheld on 2026-08-28 to cover taxes on vesting of restricted stock awards

Reference value per share for tax withholding $7.55 per share Value used for the 10,930 shares withheld to cover taxes

Shares owned after transaction 872,084 shares Total common shares beneficially owned directly by Seth Grae following the 2026-08-28 withholding

Option exercise price $12.60 per share Exercise price for fully vested employee stock options on 7,937 underlying LTBR common shares

Underlying shares for $12.60 options 7,937 shares Underlying common shares for options expiring 2027-10-26

Option exercise price $18.48 per share Exercise price for fully vested employee stock options on 18,199 underlying LTBR common shares

Underlying shares for $18.48 options 18,199 shares Underlying common shares for options expiring 2026-11-09

Key Terms

Employee Stock Option (right to buy), restricted stock awards, withheld to cover taxes, fully vested

4 terms

Employee Stock Option (right to buy) financial

"security_title: "Employee Stock Option (right to buy)" with an exercise price"

restricted stock awards financial

"Shares withheld to cover taxes upon vesting of restricted stock awards."

Restricted stock awards are company shares given to employees or executives that cannot be sold or transferred until certain conditions — like staying with the company for a set time or meeting performance targets — are met, like a gift that is locked in a safe until rules are satisfied. Investors care because these awards tie management’s pay to company performance, can increase the number of shares outstanding when they become tradable (dilution), and may signal expected future selling pressure or commitment to long-term growth.

withheld to cover taxes financial

"Shares withheld to cover taxes upon vesting of restricted stock awards."

fully vested financial

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

FAQ

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

What insider transaction did LTBR CEO Seth Grae report on this Form 4?

Seth Grae reported that 10,930 shares of LIGHTBRIDGE Corp common stock were withheld to cover taxes upon vesting of restricted stock awards on 2026-08-28 at a reference value of $7.55 per share. A footnote clarifies that no shares were sold in the market.

How many LTBR shares does CEO Seth Grae directly own after the tax withholding?

After the tax-withholding transaction, President and CEO Seth Grae directly owns 872,084 shares of LIGHTBRIDGE Corp common stock. This figure is reported as the total shares of common stock beneficially owned following the 10,930-share tax withholding on 2026-08-28.

What stock options on LTBR common stock does Seth Grae hold and at what prices?

Seth Grae holds fully vested employee stock options on LTBR common stock, including options for 7,937 shares at an exercise price of $12.60 per share and options for 18,199 shares at an exercise price of $18.48 per share, as reported in the filing.

When do Seth Grae’s reported LTBR stock options expire?

The reported employee stock options for LIGHTBRIDGE Corp held by Seth Grae expire on two dates: options on 7,937 shares at $12.60 per share expire on 2027-10-26, and options on 18,199 shares at $18.48 per share expire on 2026-11-09.

Was the LTBR CEO’s Form 4 transaction a market sale of shares?

No. A footnote states that the 10,930 shares reported were withheld to cover taxes upon vesting of restricted stock awards and that no shares were sold. This represents a tax-withholding disposition rather than an open-market sale.

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

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Available on EDGAR 08/28/2026 - 04:17 PM EDT Accepted by SEC EDGAR 08/28/2026 - 04:16 PM EDT 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 VIRGINIA 20190

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/28/2026

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	08/28/2026		F		10,930(1)	D	$7.55	872,084	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/ Larry Goldman, Attorney-in-Fact for Seth Grae	08/28/2026
	** 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)