Standard Nuclear chairman surrenders 95,590 shares for tax

After the withholding, the executive chairman reported direct holdings of 2,639,097 Class A common shares.

Rhea-AI Filing Summary

Standard Nuclear, Inc. (STDN) Executive Chairman Thomas Edward Hendrix disposed of 95,590 Class A common shares by surrendering them to the company for tax withholding upon vesting of restricted stock units on October 17, 2026. The reported $12.17 per-share figure was the closing price on the vesting date. Hendrix reported direct holdings of 2,639,097 shares after the transaction.

Insider Trade Summary

Tax Withholding: 95,590 shares

Tax Withholding 1 txn

Insider Hendrix Thomas Edward

Role Executive Chairman

Type	Security	Shares	Price	Value
Tax Withholding	Class A common stock F1	95,590	$12.17	$1.16M

Holdings After Transaction: Class A common stock — 2,639,097 shares (Direct)

Footnotes (1)

1. F1. Shares surrendered to the Company to satisfy tax withholding upon vesting of restricted stock units. Price is the closing price of the Class A common stock on the vesting date.

Key Figures

Shares surrendered for tax withholding: 95,590 shares Closing price: $12.17 per share Direct shares held after transaction: 2,639,097 shares

3 metrics

Shares surrendered for tax withholding 95,590 shares Upon vesting of restricted stock units on October 17, 2026

Closing price $12.17 per share On the vesting date

Direct shares held after transaction 2,639,097 shares Thomas Edward Hendrix's reported holdings after the transaction

Key Terms

restricted stock units, tax withholding, Rule 10b5-1 plan

3 terms

restricted stock units financial

"upon vesting of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding financial

"surrendering them to the company for tax withholding"

Tax withholding is the practice of taking a portion of a payment—such as wages, dividends, or sale proceeds—before it reaches the recipient and sending that portion to the tax authority as an advance on the recipient’s eventual tax bill. For investors it matters because withholding reduces immediate cash received and affects after‑tax returns, estimated tax payments, and whether you may owe more or receive a refund when taxes are finally calculated, like having a small automatic savings set aside for your tax bill.

Rule 10b5-1 plan regulatory

"no Rule 10b5-1 plan is reported"

A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.

FAQ

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

How many shares did Standard Nuclear (STDN) Executive Chairman Thomas Edward Hendrix surrender?

Thomas Edward Hendrix surrendered 95,590 Class A common shares to satisfy tax withholding upon vesting of restricted stock units on October 17, 2026. The reported $12.17 per-share figure was the closing price on the vesting date; no Rule 10b5-1 plan is reported.

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

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Available on EDGAR 10/19/2026 - 07:45 AM EDT Accepted by SEC EDGAR 10/19/2026 - 07:45 AM 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^*

Hendrix Thomas Edward

(Last) (First) (Middle)

C/O STANDARD NUCLEAR, INC.

200 EUROPIA AVE

(Street)

OAK RIDGE TENNESSEE 37830

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Standard Nuclear, Inc. [ STDN ]

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

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Executive Chairman

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/17/2026

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
Class A common stock	10/17/2026		F(1)		95,590	D	$12.17	2,639,097	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

Explanation of Responses:

1. Shares surrendered to the Company to satisfy tax withholding upon vesting of restricted stock units. Price is the closing price of the Class A common stock on the vesting date.

Remarks:

	/s/ Shahram Ghasemian, Attorney-in-fact for Thomas Edward Hendrix	10/19/2026
	** 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)