LTBR CEO Seth Grae executes 10b5-1 sale after exercising 20,600 options

Rhea-AI Filing Summary

Lightbridge Corporation (LTBR) President & CEO and Director Seth Grae reported an insider transaction. On October 13, 2025, he exercised 20,600 stock options at $10.80 per share and sold 20,600 shares at a $26.01 weighted average price under a Rule 10b5-1 trading plan adopted on September 12, 2024.

The sale occurred in multiple trades between $25.80 and $26.58. Following these transactions, Grae beneficially owns 753,316 shares directly. The exercised option (20,600 shares at $10.80) is now fully settled; other vested options remain outstanding with stated exercise prices and expirations.

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

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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^*

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)
10/13/2025

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	10/13/2025		M		20,600(1)	A	$10.8	773,916	D
Common Stock	10/13/2025		S		20,600(1)	D	$26.01(2)	753,316	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)	$10.8	10/13/2025		M			20,600(1)	(3)	08/06/2028	Common Stock	20,600	$0	0	D
Employee Stock Option (right to buy)	$12.6							(3)	10/26/2027	Common Stock	40,233		40,233	D
Employee Stock Option (right to buy)	$18.48							(3)	11/09/2026	Common Stock	18,199		18,199	D
Employee Stock Option (right to buy)	$55.2							(3)	11/20/2025	Common Stock	17,430		17,430	D

Explanation of Responses:

1. The reported exercise of 20,600 employee stock options and sale of 20,600 shares of common stock were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 12, 2024.

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.80 to $26.58, inclusive. The reporting person undertakes to provide to Lightbridge Corporation, any security holder of Lightbridge Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

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

	/s/ Seth Grae	10/14/2025
	** 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.
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FAQ

What insider transaction did LTBR’s CEO report?

Seth Grae exercised 20,600 options at $10.80 and sold 20,600 shares at a $26.01 weighted average on 10/13/2025.

Was the LTBR share sale under a trading plan?

Yes. The transactions were effected under a Rule 10b5-1 trading plan adopted on September 12, 2024.

What price range were the LTBR shares sold at?

Multiple transactions occurred between $25.80 and $26.58; the weighted average price was $26.01.

How many LTBR shares does the CEO own after the transactions?

Following the reported trades, Seth Grae beneficially owns 753,316 shares directly.

Which option grant did the CEO exercise?

An employee stock option for 20,600 shares at an exercise price of $10.80, expiring on 08/06/2028.

What other vested LTBR options remain for the CEO?

Remaining options include: 40,233 at $12.60 (exp. 10/26/2027), 18,199 at $18.48 (exp. 11/09/2026), and 17,430 at $55.20 (exp. 11/20/2025).