Standard Nuclear, Inc. ( STDN )

Aug 27, 2026Item 8.01, 9.01

Aug 27, 2026Item 2.02, 9.01

Aug 20, 2026Item 8.01, 9.01

Aug 14, 2026Item 5.02, 9.01

STDN insider trading FAQ

What is the latest insider trade for STDN?

Standard Nuclear, Inc. (STDN) had 7 insider filings in the last 90 days, with the most recent on 19 October 2026. The full record for STDN runs to 22 Form 4 filings, the earliest from 17 July 2026. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.

How many insiders are buying STDN stock?

No insider purchases of STDN were filed in the last 90 days. 1 purchase is on record for this company.

How many insiders are selling STDN stock?

No insider sales of STDN were filed in the last 90 days.

Where can I see STDN SEC filings (Form 4, 10-K, 10-Q, 8-K)?

This page collects STDN Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.

More Materials companies with insider activity

Recent insider filings

The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.

Oct 19, 2026 - Shahram Ghasemian view on EDGAR
Oct 19, 2026 - Kurt Amir Terrani view on EDGAR
Oct 19, 2026 - Keeley Rose Marrocco view on EDGAR
Oct 19, 2026 - Kevin J. Harrill view on EDGAR
Oct 19, 2026 - Thomas Edward Hendrix view on EDGAR
Aug 28, 2026 - Seth Michael Cohen view on EDGAR
Aug 14, 2026 - Seth Michael Cohen view on EDGAR
Jul 31, 2026 - Fundomo SN-001, LP view on EDGAR
Jul 23, 2026 - ST-1014 Fund I, a series of Fundomo Syndicates, LP view on EDGAR
Jul 23, 2026 - Welara Capital Partners LLC Series 3 view on EDGAR

Related companies with recent insider activity

Learn more

What the Form 4 transaction codes mean: Grants, option exercises, gifts and tax withholding are not trades on the market. The codes say which is which.
Insider activity in Materials: Where STDN's peers are being bought and sold.
Every recent Form 4: The market-wide feed, updated as filings arrive from SEC EDGAR.

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Form 4 transaction type

Transactions

Total value

Grant or award

26,510

Tax withholding / forfeiture

250,734

Traded

Insider

Transaction

Security

Price

Value

Oct 15, 2026

Shahram Ghasemian - Officer

Tax withholding / forfeiture

Class A common stock

5,016

$12.02

$60K

Oct 17, 2026

Kurt Amir Terrani - Officer

Tax withholding / forfeiture

Class A common stock

110,014

$12.17

$1.34M

Oct 17, 2026

Keeley Rose Marrocco - Officer

Tax withholding / forfeiture

Class A common stock

7,399

$12.17

$90K

Oct 17, 2026

Kevin J. Harrill - Officer

Tax withholding / forfeiture

Class A common stock

32,715

$12.17

$398K

Oct 17, 2026

Thomas Edward Hendrix - Officer

Tax withholding / forfeiture

Class A common stock

95,590

$12.17

$1.16M

Aug 12, 2026

Seth Michael Cohen - Director

Grant or award

Class A common stock

13,255^{footnote F1}

$0.00

Footnote F1 (shares): 13,255 represents shares of Class A Common Stock underlying an award of restricted stock units ("RSUs"). 100% of the RSUs will vest on the earlier of (i) the day before the Issuer's 2027 Annual Meeting of Stockholders or (ii) the one-year anniversary of the grant date, subject… Full note on SEC EDGAR

Aug 12, 2026

Seth Michael Cohen - Director

Grant or award

Class A common stock

13,255^{footnote F1}

$0.00

Footnote F1 (shares): Represents shares of Class A Common Stock underlying an award of restricted stock units ("RSUs"). 100% of the RSUs will vest on the earlier of (i) the day before the Issuer's 2027 Annual Meeting of Stockholders or (ii) the one-year anniversary of the grant date, subject to the… Full note on SEC EDGAR

Jul 17, 2026

Fundomo SN-001, LP - 10% Owner

Other

Class A Common Stock

3,849,782

-^{footnote F1}

Jul 17, 2026

Fundomo SN-001, LP - 10% Owner

Other

Class A Common Stock

2,027,576

-^{footnote F1}

Jul 17, 2026

Fundomo SN-001, LP - 10% Owner

Other

Class A Common Stock

14,000,000

-^{footnote F1}

Jul 17, 2026

Fundomo SN-001, LP - 10% Owner

Other

Series A Preferred Stock

3,849,782

$0.00

Jul 17, 2026

Fundomo SN-001, LP - 10% Owner

Other

Series A-2 Preferred Stock

2,027,576

$0.00

Jul 17, 2026

Fundomo SN-001, LP - 10% Owner

Other

Series Seed-1 Preferred Stock

14,000,000

$0.00

Footnote F1 (price): The Series Seed-1 Preferred Stock, Series A Preferred Stock, and Series A-2 Preferred Stock automatically converted into Class A Common Stock of the Issuer on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering. The securities had no… Full note on SEC EDGAR

Jul 17, 2026

ST-1014 Fund I, a series of Fundomo Syndicates, LP - 10% Owner

Other

Class A Common Stock

14,000,000

-^{footnote F1}

Jul 17, 2026

ST-1014 Fund I, a series of Fundomo Syndicates, LP - 10% Owner

Other

Series Seed-1 Preferred Stock

14,000,000

$0.00

Footnote F1 (price): The Series Seed-1 Preferred Stock automatically converted into Class A Common Stock of the Issuer on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering. The securities had no expiration date.

Jul 17, 2026

Other

Class A Common Stock

20,243,094

-^{footnote F1}

Jul 17, 2026

Other

Series Seed-1 Preferred Stock

15,000,000

-^{footnote F1}

Jul 17, 2026

Other

Series A Preferred Stock

3,515,018

-^{footnote F1}

Jul 17, 2026

Other

Series A-2 Preferred Stock

1,728,076

-^{footnote F1}

Footnote F1 (price): Pursuant to the Issuer's Fifth Amended and Restated Certificate of Incorporation, in connection with the completion of the Issuer's initial public offering of its Class A Common Stock, each share of Series Seed-1 Preferred Stock, Series A Preferred Stock, and Series A-2… Full note on SEC EDGAR

Jul 20, 2026

Kurt Amir Terrani - Officer

Gift

Class A common stock

629,374^{footnote F1}

$0.00

Jul 20, 2026

Kurt Amir Terrani - Officer

Gift

Class A common stock

629,374^{footnote F1}

$0.00

Jul 20, 2026

Kurt Amir Terrani - Officer

Gift

Class A common stock

175,000^{footnote F1}

$0.00

Jul 20, 2026

Kurt Amir Terrani - Officer

Gift

Class A common stock

175,000^{footnote F1}

$0.00

Jul 20, 2026

Kurt Amir Terrani - Officer

Gift

Class A common stock

175,000^{footnote F1}

$0.00

Jul 20, 2026

Kurt Amir Terrani - Officer

Gift

Class A common stock

175,000^{footnote F1}

$0.00

Jul 20, 2026

Kurt Amir Terrani - Officer

Gift

Class A common stock

60,000^{footnote F1}

$0.00

Jul 20, 2026

Kurt Amir Terrani - Officer

Gift

Class A common stock

60,000^{footnote F1}

$0.00

Jul 20, 2026

Kurt Amir Terrani - Officer

Gift

Class A common stock

245,000^{footnote F1}

$0.00

Jul 20, 2026

Kurt Amir Terrani - Officer

Gift

Class A common stock

245,000^{footnote F1}

$0.00

Footnote F1 (shares): Represents a bona fide gift by the Reporting Person, for no consideration, to a trust established for the benefit of members of the Reporting Person's immediate family, as further described in the footnotes below. The Reporting Person is subject to a lock-up agreement that was… Full note on SEC EDGAR

Jul 17, 2026

Fundomo SN-001, LP - 10% Owner

Other

Series A Preferred Stock

3,849,782

$0.00

Jul 17, 2026

Fundomo SN-001, LP - 10% Owner

Other

Series A-2 Preferred Stock

2,027,576

$0.00

Jul 17, 2026

Fundomo SN-001, LP - 10% Owner

Other

Series Seed-1 Preferred Stock

14,000,000

$0.00

Jul 17, 2026

Fundomo SN-001, LP - 10% Owner

Other

Class A Common Stock

2,027,576

-^{footnote F1}

Jul 17, 2026

Fundomo SN-001, LP - 10% Owner

Other

Class A Common Stock

3,849,782

-^{footnote F1}

Jul 17, 2026

Fundomo SN-001, LP - 10% Owner

Other

Class A Common Stock

14,000,000

-^{footnote F1}

Jul 17, 2026

Fundomo SN-001, LP - 10% Owner

Other

Series A Preferred Stock

3,849,782

$0.00

Jul 17, 2026

Fundomo SN-001, LP - 10% Owner

Other

Series A-2 Preferred Stock

2,027,576

$0.00

Jul 17, 2026

Fundomo SN-001, LP - 10% Owner

Other

Series Seed-1 Preferred Stock

14,000,000

$0.00

Footnote F1 (price): The Series Seed-1 Preferred Stock, Series A Preferred Stock, and Series A-2 Preferred Stock automatically converted into Class A Common Stock of the Issuer on a 1-for-1 basis immediately prior to the closing of the Issuer's initial public offering. The securities had no… Full note on SEC EDGAR

Jul 15, 2026

Keeley Rose Marrocco - Officer

Grant or award

Class A common stock

200,000^{footnote F1}

$0.00

Jul 17, 2026

Keeley Rose Marrocco - Officer

Grant or award

Class A common stock

364,625^{footnote F2}

$0.00

Footnote F1 (shares): 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… Full note on SEC EDGAR
Footnote F2 (shares): 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.

Jul 15, 2026

Donald A. Moul - Director

Grant or award

Class A common stock

10,964^{footnote F1}

$0.00

Footnote F1 (shares): Represents shares of Class A Common Stock underlying an award of restricted stock units ("RSUs"). 100% of the RSUs will vest on the earlier of (i) the day before the Issuer's 2027 Annual Meeting of Stockholders or (ii) the one-year anniversary of the grant date, subject to the… Full note on SEC EDGAR

Jul 15, 2026

Austin Scott Miller - Director

Grant or award

Class A common stock

11,436^{footnote F1}

$0.00

Footnote F1 (shares): 1. Represents shares of Class A Common Stock underlying an award of restricted stock units ("RSUs"). 100% of the RSUs will vest on the earlier of (i) the day before the Issuer's 2027 Annual Meeting of Stockholders or (ii) the one-year anniversary of the grant date, subject to… Full note on SEC EDGAR

Jul 17, 2026

Alexander C. Matina - Director

Grant or award

Class A common stock

16,667^{footnote F1}

$0.00

Footnote F1 (shares): Represents shares of Class A Common Stock underlying an award of restricted stock units ("RSUs"). The RSUs will vest in quarterly installments of 1/12th over three years, subject to the Reporting Person's continued service through each vesting date.

Jul 15, 2026

Kurt Amir Terrani - Officer

Grant or award

Class A common stock

200,000^{footnote F1}

$0.00

Jul 17, 2026

Kurt Amir Terrani - Officer

Grant or award

Class A common stock

3,646,250^{footnote F2}

$0.00

Footnote F1 (shares): 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… Full note on SEC EDGAR
Footnote F2 (shares): 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.

Jul 17, 2026

Thomas Edward Hendrix - Officer

Grant or award

Class A common stock

2,734,687^{footnote F1}

$0.00

Jul 17, 2026

Thomas Edward Hendrix - Officer

Other

Class A common stock

50,000^{footnote F3}

$0.00

Jul 17, 2026

Thomas Edward Hendrix - Officer

Other

Class A common stock

20,308^{footnote F3}

$0.00

Jul 17, 2026

Thomas Edward Hendrix - Officer

Other

Class A common stock

5,824,308^{footnote F4}

$0.00

Jul 17, 2026

Thomas Edward Hendrix - Officer

Other

Class B Common Stock

5,824,308

-^{footnote F4}

Footnote F1 (shares): Represents shares of Class A Common Stock underlying an award of restricted stock units ("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. Each share of Class A Common… Full note on SEC EDGAR
Footnote F3 (shares): In connection with the completion of the Issuer's initial public offering of its Class A Common Stock (the "IPO"), each share of Series Seed Preferred, Series Seed-1 Preferred, Series A Preferred, and Series A-2 Preferred was automatically converted into shares of Class A Common… Full note on SEC EDGAR
Footnote F4 (shares, price): Pursuant to an Exchange Agreement entered into between the Issuer and the trust, all 5,824,308 shares of Class A Common Stock held by the trust after giving effect to the Preferred Conversion were exchanged for an equivalent number of newly issued shares of Class B Common Stock… Full note on SEC EDGAR

Jul 15, 2026

Shahram Ghasemian - Officer

Grant or award

Class A common stock

40,000^{footnote F1}

$0.00

Jul 15, 2026

Shahram Ghasemian - Officer

Grant or award

Class A common stock

360,000^{footnote F2}

$0.00

Jul 15, 2026

Shahram Ghasemian - Officer

Grant or award

Class A common stock

100,000^{footnote F3}

$0.00

Jul 15, 2026

Shahram Ghasemian - Officer

Grant or award

Class A common stock

100,000^{footnote F4}

$0.00

Footnote F1 (shares): Represents shares of Class A Common Stock underlying an award of restricted stock units ("RSUs"). The RSUs vested in full upon pricing of the Issuer's initial public offering.
Footnote F2 (shares): Represents shares of Class A Common Stock underlying an award of RSUs. The RSUs will vest over four years with 25% vesting on May 4, 2027 and the remainder vesting in equal quarterly installments thereafter, subject to the Reporting Persons continued service through each vesting… Full note on SEC EDGAR
Footnote F3 (shares): 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 Person's continued service through each vesting date.
Footnote F4 (shares): Represents shares of Class A Common Stock underlying an award of 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… Full note on SEC EDGAR

Jul 15, 2026

Kevin J. Harrill - Officer

Grant or award

Class A common stock

100,000^{footnote F1}

$0.00

Jul 17, 2026

Kevin J. Harrill - Officer

Grant or award

Class A common stock

546,937^{footnote F2}

$0.00

Footnote F1 (shares): 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… Full note on SEC EDGAR
Footnote F2 (shares): 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.

Jul 16, 2026

Open-market purchase

Class A Common Stock

1,275,496

$15.00^{footnote F1}

$19.13M

Jul 17, 2026

Other

Class A Common Stock

505,478

-^{footnote F3}

Jul 17, 2026

Other

Class A Common Stock

5,800,000

-^{footnote F3}

Jul 17, 2026

Other

Class A Common Stock

4,000,000

-^{footnote F3}

Jul 17, 2026

Other

Class A Common Stock

1,154,934

-^{footnote F3}

Jul 17, 2026

Other

Class A Common Stock

506,894

-^{footnote F3}

Jul 17, 2026

Other

Class A Common Stock

2,451,678

-^{footnote F3}

Jul 17, 2026

Other

Class A Common Stock

2,242,330

-^{footnote F3}

Jul 17, 2026

Other

Series Seed-1 Preferred

5,800,000

-^{footnote F3}

Jul 17, 2026

Other

Series Seed-1 Preferred

4,000,000

-^{footnote F3}

Jul 17, 2026

Other

Series Seed Preferred

2,451,678

-^{footnote F3}

Jul 17, 2026

Other

Series A Preferred

1,154,934

-^{footnote F3}

Jul 17, 2026

Other

Series A Preferred

2,242,330

-^{footnote F3}

Jul 17, 2026

Other

Series A-2 Preferred

505,478

-^{footnote F3}

Jul 17, 2026