Standard Nuclear, Inc.
Ownership
Ownership Structure
Who owns Standard Nuclear, Inc. (STDN)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 61.7% of the shares are freely tradable; institutional investors hold 5.7%.
Largest Shareholders
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 0.05 | 86,451 | +0.0 | 08/31/2026 |
| Portland Replacement of Fssl Ful Alt F | 0.05 | 78,500 | +0.0 | 08/31/2026 |
| Vanguard Balanced Index Inv | 0.00 | 1,463 | +0.0 | 08/31/2026 |
| Vanguard MStar Inst Ttl StkMktIdxInstlPl | 0.00 | 1,297 | +0.0 | 08/31/2026 |
| Vanguard U.S. Eq Idx £ Acc | 0.00 | 1,049 | +0.0 | 08/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Cohen Seth Michael | Director | 13,255 | 152,433 $ | Aug 12, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 12, 2026 | Cohen Seth Michael | Director | Other | 13,255 | 0.00 | – |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: September 28, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.