Siebert Financial Corp (Nasdaq: SIEB), an SEC filer in Security Brokers, Dealers & Flotation Companies, closed at $2.19, +11.2%, on 2026-08-28, with a market cap of $81M as of 2026-08-27, a trailing P/E of 15.2, a return on equity of 5.9%, a net margin of 5.4% and 3-year sales growth of 23.4%. Institutional ownership, earnings history and filed financials are on the tabs below.
| # | Holder | Shares | Value | % of shares out | Δ QoQ |
|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 779,586779,586 | $1M | 1.90% | — |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 550,619550,619 | $1M | 1.34% | NEW |
| 3 | GEODE CAPITAL MANAGEMENT, LLC | 435,539435,539 | $836,506 | 1.06% | ADD 4% |
| 4 | UBS Group AG | 160,593160,593 | $308,339 | 0.39% | ADD 84% |
| 5 | Cetera Investment Advisers | 146,459146,459 | $281,201 | 0.36% | TRIM -4% |
| 6 | STATE STREET CORP | 144,234144,234 | $276,929 | 0.35% | — |
| 7 | NORTHERN TRUST CORP | 138,625138,625 | $266,161 | 0.34% | ADD 8% |
| 8 | VANGUARD FIDUCIARY TRUST CO | 112,895112,895 | $216,758 | 0.28% | NEW |
| 9 | STRS OHIO | 84,20084,200 | $161,664 | 0.21% | — |
| 10 | VANGUARD PORTFOLIO MANAGEMENT LLC | 80,71580,715 | $154,973 | 0.20% | NEW |
Ranked by each filer’s own reported value, not shares.
| Biggest buyers | Δ shares | Δ value | |
|---|---|---|---|
| VANGUARD CAPITAL MANAGEMENT LLC | +550,619 | $1M | OPEN |
| VANGUARD FIDUCIARY TRUST CO | +112,895 | $216,758 | OPEN |
| VANGUARD PORTFOLIO MANAGEMENT LLC | +80,715 | $154,973 | OPEN |
| UBS Group AG | +73,299 | $140,734 | ADD |
| CITADEL ADVISORS LLC | +27,345 | $52,502 | OPEN |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| VANGUARD GROUP INC | −752,586 | $1M | CLOSE |
| NAVELLIER & ASSOCIATES INC | −68,326 | $131,186 | CLOSE |
| DIMENSIONAL FUND ADVISORS LP | −27,509 | $52,817 | TRIM |
| WINTON GROUP Ltd | −19,336 | $37,125 | CLOSE |
| BARCLAYS PLC | −19,165 | $36,797 | TRIM |
Prior quarter split-rebased · 13Fs are long, US-listed only.
| Holder | 2024-Q4 | 2025-Q1 | 2025-Q2 | 2025-Q3 | 2025-Q4 | 2026-Q1 | Latest value |
|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 44K | 44K | 773K | 770K | 791K | 780K | $1M |
| VANGUARD CAPITAL MANAGEMENT LLC | — | — | — | — | — | 551K | $1M |
| GEODE CAPITAL MANAGEMENT, LLC | 217K | 220K | 400K | 417K | 418K | 436K | $836,506 |
| UBS Group AG | 2K | 405 | 265K | 223K | 87K | 161K | $308,339 |
| Cetera Investment Advisers | 162K | 161K | 152K | 152K | 152K | 146K | $281,201 |
| STATE STREET CORP | 24K | 24K | 112K | 144K | 144K | 144K | $276,929 |
| NORTHERN TRUST CORP | 41K | 41K | 117K | 141K | 128K | 139K | $266,161 |
| VANGUARD FIDUCIARY TRUST CO | — | — | — | — | — | 113K | $216,758 |
| STRS OHIO | — | — | 84K | 84K | 84K | 84K | $161,664 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | — | — | — | — | — | 81K | $154,973 |
Green = added, red = trimmed, grey = held; a dash is a quarter with no 13F on file — a gap, not an exit.
Breaks = no 13F that quarter.
Short interest has its own tab now — open SI →
SEC Form 13F · ~10,250 filers, 10y · long-only, US-listed, filed ≤45d after quarter-end.
