Siebert Financial Corp
Ownership
Ownership Structure
Who owns Siebert Financial Corp (SIEB)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 53.9% of the shares are freely tradable; institutional investors hold 8.0%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 1.90 | 779,586 | -1.5 | 03/31/2026 |
| Vanguard Capital Management, LLC | 1.34 | 550,619 | +0.0 | 03/31/2026 |
| Geode Capital Management, LLC | 1.06 | 435,539 | +4.1 | 03/31/2026 |
| UBS Group AG | 0.39 | 160,593 | +84.0 | 03/31/2026 |
| Cetera Investment Advisers | 0.36 | 146,459 | -3.7 | 03/31/2026 |
| State Street Corp | 0.35 | 144,234 | +0.0 | 03/31/2026 |
| Northern Trust Corp | 0.34 | 138,625 | +8.0 | 03/31/2026 |
| Millennium Management LLC | 0.30 | 121,232 | +0.0 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 0.78 | 322,275 | +0.0 | 07/31/2026 |
| Vanguard Institutional Extnd Mkt Idx Tr | 0.55 | 227,445 | +0.0 | 07/31/2026 |
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 |
|---|---|---|---|---|---|
| Gebbia John J | CEO | 9,794,994 | 23,507,986 $ | Sep 2, 2026 | indirect |
| Gebbia Gloria E | Director | 9,794,994 | 23,507,986 $ | Sep 2, 2026 | indirect |
| Gebbia Richard | Member of 10% owner group | 576,273 | 1,383,055 $ | May 28, 2026 | indirect |
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 |
|---|---|---|---|---|---|---|
| Sep 2, 2026 | Gebbia John J | CEO | Other | 10,000 | 0.00 | – |
| Sep 2, 2026 | Gebbia Gloria E | Director | Other | 10,000 | 0.00 | – |
| Aug 26, 2026 | Gebbia John J | CEO | Other | 22,500 | 0.00 | – |
| Aug 26, 2026 | Gebbia Gloria E | Director | Other | 22,500 | 0.00 | – |
| May 28, 2026 | Gebbia Richard | Member of 10% owner group | Buy | 15,000 | 1.86 | 27,900 |
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 18, 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.