STOCK TITAN

Standard Nuclear (STDN) CFO reports 941,222 restricted shares and options

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
3

Rhea-AI Filing Summary

Standard Nuclear, Inc. Chief Financial Officer Kevin J. Harrill reports beneficial ownership of 941,222 shares of Class A common stock held pursuant to restricted stock awards.

He also directly holds incentive stock options to purchase 244,628 and 61,162 Class A shares at an exercise price of $1.635 per share, expiring 2036-04-19, with vesting based on continued service and the issuer's initial public offering.

Positive

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Negative

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Insider HARRILL KEVIN J
Role Chief Financial Officer
Type Security Shares Price Value
holding Incentive stock options -- -- --
holding Incentive stock options -- -- --
holding Class A common stock -- -- --
Holdings After Transaction: Incentive stock options — 244,628 shares (Direct); Class A common stock — 941,222 shares (Direct)
Footnotes (1)
  1. Represents 941,222 shares of Class A Common Stock pursuant to restricted stock awards Represents a stock option to purchase 244,628 shares of Class A Common Stock granted on April 20, 2026 with an exercise price of $1.635 per share, which will vest which vests as follows: 25% vests on March 9, 2027, with an additional 3/48th vesting quarterly thereafter, subject to the Reporting Person's continued service. Represents a stock option to purchase 61,162 shares of Class A Common Stock granted on April 20, 2026 with an exercise price of $1.635 per share, which will vest upon the consummation of the Issuer's initial public offering, subject to the Reporting Person's continued service.
Restricted Class A shares 941,222 shares Beneficial ownership of Class A common stock pursuant to restricted stock awards
Option underlying shares (grant 1) 244,628 shares Stock option to purchase 244,628 Class A shares granted on April 20, 2026
Option underlying shares (grant 2) 61,162 shares Stock option to purchase 61,162 Class A shares granted on April 20, 2026
Exercise price $1.635 per share Exercise price for both incentive stock option grants
Option expiration 2036-04-19 Expiration date for both incentive stock option grants
Initial vesting tranche 25% Portion of 244,628-share option vesting on March 9, 2027, subject to continued service
restricted stock awards financial
"Represents 941,222 shares of Class A Common Stock pursuant to 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.
Incentive stock options financial
"Incentive stock options with an exercise price of $1.635 per share"
Incentive stock options are a type of employee stock option that gives eligible workers the right to buy company shares at a fixed price later on, often below future market value. They matter to investors because they align employee incentives with company performance, can dilute existing ownership when exercised, and create potential tax advantages for option holders if certain holding-time rules are met — think of them as a coupon to buy stock at today’s price with extra tax rules attached.
exercise price financial
"with an exercise price of $1.635 per share"
The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.
initial public offering regulatory
"which will vest upon the consummation of the Issuer's initial public offering"
An initial public offering (IPO) is when a private company first sells its shares to the public and becomes a stock-listed company. It matters because it allows the company to raise money from a wide range of investors, helping it grow, while giving early shareholders a way to sell some of their ownership.

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

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FAQ

What equity does STDN CFO Kevin J. Harrill report owning in this Form 3?

Kevin J. Harrill reports beneficial ownership of 941,222 Class A shares via restricted stock awards, plus incentive stock options over 244,628 and 61,162 additional Class A shares, all held directly.

How many restricted Class A shares does STDN's CFO hold?

The CFO reports holding 941,222 shares of Standard Nuclear, Inc. Class A common stock. These shares are described as being held pursuant to restricted stock awards, reflecting equity-based compensation rather than open-market purchases.

What stock options in STDN does Kevin J. Harrill hold and at what exercise price?

He holds incentive stock options over 244,628 and 61,162 Class A shares. Both option grants carry an exercise price of $1.635 per share and share the same stated expiration date of 2036-04-19.

When do the STDN stock options reported by the CFO vest?

The 244,628-share option grant vests 25% on March 9, 2027, with an additional 3/48th vesting quarterly thereafter, subject to continued service. The 61,162-share option vests upon consummation of the issuer's initial public offering, also subject to continued service.

Are Kevin J. Harrill’s reported STDN holdings direct or indirect?

All reported positions are listed as direct ownership. This includes the 941,222 restricted Class A shares and both incentive stock option grants, indicating they are held in his own name rather than through an intermediary entity.
SEC Form 3
FORM 3UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:3235-0104
Estimated average burden
hours per response:0.5
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. Date of Event Requiring Statement (Month/Day/Year)
07/15/2026
3. Issuer Name and Ticker or Trading Symbol
Standard Nuclear, Inc. [ STDN ]
3a. Foreign Trading Symbol
5. If Amendment, Date of Original Filed (Month/Day/Year)
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Financial Officer
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Class A common stock941,222(1)D
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year)3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date ExercisableExpiration DateTitleAmount or Number of Shares
Incentive stock options (2)04/19/2036Class A common stock244,628$1.635D
Incentive stock options (3)04/19/2036Class A common stock61,162$1.635D
Explanation of Responses:
1. Represents 941,222 shares of Class A Common Stock pursuant to restricted stock awards
2. Represents a stock option to purchase 244,628 shares of Class A Common Stock granted on April 20, 2026 with an exercise price of $1.635 per share, which will vest which vests as follows: 25% vests on March 9, 2027, with an additional 3/48th vesting quarterly thereafter, subject to the Reporting Person's continued service.
3. Represents a stock option to purchase 61,162 shares of Class A Common Stock granted on April 20, 2026 with an exercise price of $1.635 per share, which will vest upon the consummation of the Issuer's initial public offering, subject to the Reporting Person's continued service.
Remarks:
/s/ Kevin J. Harrill07/15/2026
** 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 5 (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 3: SEC 1473 (03-26)