Standard Nuclear COO receives new RSU awards

Marrocco Keeley Rose reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Marrocco Keeley Rose reported acquisition or exercise transactions in this Form 4 filing.

Standard Nuclear, Inc. reported that Chief Operating Officer Marrocco Keeley Rose received two equity compensation awards in the form of restricted stock units (RSUs) tied to Class A common stock. On July 15, 2026, Rose was granted RSUs covering 200,000 shares, vesting over four years, with 25% vesting on June 1, 2027 and the remainder in equal monthly installments, subject to continued service. On July 17, 2026, Rose received additional RSUs covering 364,625 shares, vesting over three years in quarterly 1/12th installments, also subject to continued service, resulting in 3,564,625 shares of Class A common stock held directly after this award.

Insider Trade Summary

Grant/Award: 564,625 shares

Grant/Award 2 txns

Insider Marrocco Keeley Rose

Role Chief Operating Officer

Type	Security	Shares	Price	Value
Grant/Award	Class A common stock F2	364,625	$0.00	$0.00
Grant/Award	Class A common stock F1	200,000	$0.00	$0.00

Holdings After Transaction: Class A common stock — 3,564,625 shares (Direct)

Footnotes (2)

1. F1. Represents shares of Class A Common Stock underlying an award of restricted stock units ("RSUs"). The RSUs will vest over four years, with 25% vesting on June 1, 2027 and the remainder vesting in equal monthly installments thereafter, subject to the Reporting Person's continued service through each vesting date.
2. F2. Represents shares of Class A Common Stock underlying an award of RSUs. The RSUs will vest over three years in quarterly installments of 1/12th, subject to the Reporting Person's continued service through each vesting date.

Key Figures

RSUs granted July 15, 2026: 200,000 shares RSUs granted July 17, 2026: 364,625 shares Total direct holdings after July 17, 2026 award: 3,564,625 shares +2 more

5 metrics

RSUs granted July 15, 2026 200,000 shares Class A common stock underlying RSUs awarded to COO Marrocco Keeley Rose

RSUs granted July 17, 2026 364,625 shares Additional Class A common stock underlying RSUs awarded to COO

Total direct holdings after July 17, 2026 award 3,564,625 shares Class A common stock held directly by Marrocco Keeley Rose following latest grant

Initial vesting date for 200,000 RSUs June 1, 2027 25% of the July 15, 2026 RSU award vests on this date

Vesting term for second RSU award three years 364,625 RSUs vest in quarterly installments of 1/12th over this period

Key Terms

restricted stock units ("RSUs"), vesting, Class A Common Stock

3 terms

restricted stock units ("RSUs") financial

"Represents shares of Class A Common Stock underlying an award of restricted stock units ("RSUs")."

Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.

vesting financial

"The RSUs will vest over four years, with 25% vesting on June 1, 2027"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

Class A Common Stock financial

"Represents shares of Class A Common Stock underlying an award of RSUs."

Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.

FAQ

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

What insider equity awards did Standard Nuclear (STDN) disclose for its COO?

Standard Nuclear disclosed that COO Marrocco Keeley Rose received two RSU awards tied to Class A common stock, covering 200,000 and 364,625 shares, with multi‑year vesting schedules contingent on continued service with the company.

How many RSUs did STDN grant to the COO on July 15, 2026?

On July 15, 2026, STDN granted COO Marrocco Keeley Rose 200,000 shares of Class A common stock underlying RSUs. These RSUs vest over four years, with 25% vesting on June 1, 2027 and the balance vesting in equal monthly installments thereafter.

What is the vesting schedule for the July 17, 2026 RSU grant at STDN?

The July 17, 2026 award covers 364,625 shares of Class A common stock underlying RSUs. These RSUs vest over three years in quarterly installments of 1/12th of the award, conditioned on Marrocco Keeley Rose’s continued service through each vesting date.

What are Marrocco Keeley Rose’s direct share holdings in STDN after these grants?

After the July 17, 2026 RSU award, Marrocco Keeley Rose directly holds 3,564,625 shares of Standard Nuclear’s Class A common stock. This figure reflects the reported total direct holdings following the most recent RSU grant disclosed in the Form 4 filing.

Are the new RSU awards for STDN’s COO subject to continued service conditions?

Yes. Both RSU awards are explicitly subject to the COO’s continued service with Standard Nuclear. Each portion vests only if Marrocco Keeley Rose remains in service through the applicable vesting dates specified for the four‑year and three‑year schedules.

Do the RSU awards to STDN’s COO involve any cash purchase price?

No cash purchase price is involved; both RSU awards list a per‑share price of $0.0000, indicating equity compensation rather than a market purchase. The economic benefit arises as the RSUs vest into Class A common stock over time.

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

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Accepted by SEC EDGAR 07/17/2026 - 09:14 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^*

Marrocco Keeley Rose

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/15/2026

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	07/15/2026		A		200,000(1)	A	$0	3,200,000	D
Class A common stock	07/17/2026		A		364,625(2)	A	$0	3,564,625	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. Represents shares of Class A Common Stock underlying an award of restricted stock units ("RSUs"). The RSUs will vest over four years, with 25% vesting on June 1, 2027 and the remainder vesting in equal monthly installments thereafter, subject to the Reporting Person's continued service through each vesting date.

2. Represents shares of Class A Common Stock underlying an award of RSUs. The RSUs will vest over three years in quarterly installments of 1/12th, subject to the Reporting Person's continued service through each vesting date.

Remarks:

	/s/ Shahram Ghasemian, by power of attorney	07/17/2026
	** 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)