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  4. [Form 4] Standard Nuclear, Inc. Insider Trading Activity

Standard Nuclear grants CFO 546,937 RSUs

HARRILL KEVIN J reported acquisition or exercise transactions in this Form 4 filing.

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

HARRILL KEVIN J reported acquisition or exercise transactions in this Form 4 filing.

Standard Nuclear, Inc. reported equity compensation awards to Chief Financial Officer Kevin J. Harrill. He received 100,000 shares of Class A common stock underlying restricted stock units on July 15, 2026 and 546,937 RSU-based shares on July 17, 2026, bringing his direct holdings to 1,588,159 shares. The 100,000-share grant vests over four years, with 25% vesting on June 1, 2027 and the balance in equal monthly installments, while the 546,937-share grant vests over 18 months in quarterly installments of one-sixth, all contingent on continued service.

Positive

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Negative

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Insider HARRILL KEVIN J
Role Chief Financial Officer
Type Security Shares Price Value
Grant/Award Class A common stock F2 546,937 $0.00 $0.00
Grant/Award Class A common stock F1 100,000 $0.00 $0.00
Holdings After Transaction: Class A common stock — 1,588,159 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 18 months in quarterly installments of 1/6th, subject to the Reporting Persons continued service through each vesting date.
RSU award shares (July 17, 2026) 546937.0000 shares Class A common stock underlying RSUs granted to CFO on 2026-07-17
RSU award shares (July 15, 2026) 100000.0000 shares Class A common stock underlying RSUs granted to CFO on 2026-07-15
Holdings after latest grant 1588159.0000 shares Direct Class A common stock held by CFO following 2026-07-17 award
Holdings after earlier grant 1041222.0000 shares Direct Class A common stock held by CFO following 2026-07-15 award
Initial cliff vesting portion 25% Portion of 100,000-share RSU award vesting on June 1, 2027
Second award vesting period 18 months Duration over which 546,937-share RSU award vests in quarterly installments
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.
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.
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.

FAQ

What equity awards did STDN CFO Kevin J. Harrill receive in July 2026?
Kevin J. Harrill received two RSU-based equity awards: 100,000 shares of Class A common stock underlying RSUs on July 15, 2026 and 546,937 RSU-based Class A shares on July 17, 2026, both structured as stock unit grants rather than open-market purchases.

How many Standard Nuclear (STDN) shares does the CFO hold after these awards?
Following the July 17, 2026 RSU-based grant, Kevin J. Harrill directly holds 1,588,159 shares of Standard Nuclear Class A common stock. This figure reflects the cumulative position reported after the latest award, including the previously granted RSU-based shares.

What is the vesting schedule for Kevin Harrill’s 100,000-share RSU grant at STDN?
The 100,000-share RSU award vests over four years, with 25% vesting on June 1, 2027 and the remaining 75% vesting in equal monthly installments thereafter, conditioned on Kevin Harrill’s continued service through each vesting date.

How will the 546,937 RSU-based shares granted to STDN’s CFO vest?
The 546,937 RSU-based Class A shares vest over an 18-month period in quarterly installments of one-sixth of the award each quarter. Vesting at each installment is contingent on the reporting person’s continued service through the applicable vesting date.

Were Kevin Harrill’s recent STDN share acquisitions open-market purchases?
No. Both reported acquisitions are restricted stock unit (RSU) awards representing shares of Class A common stock. They are equity compensation grants that vest over time, rather than open-market stock purchases at a cash price per share.

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

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SEC Form 4
FORM 4UNITED 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*
HARRILL KEVIN J
(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)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Financial 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)
XForm 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)
CodeVAmount(A) or (D)Price
Class A common stock07/15/2026A100,000(1)A$01,041,222D
Class A common stock07/17/2026A546,937(2)A$01,588,159D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount 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 18 months in quarterly installments of 1/6th, subject to the Reporting Persons continued service through each vesting date.
Remarks:
/s/ Shahram Ghasemian, by power of attorney07/17/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR