Octave Specialty Group, Inc. (OSG) ownership: Top institutional holder: BlackRock Fund Advisors ($22.09M). Insider activity: Net Seller (3 buys, 17 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock Fund Advisors | 981687.00 | $22.09M | 2016-12-31 |
| VANGUARD GROUP INC | 2508395.00 | $19.52M | 2025-12-31 |
| BlackRock, Inc. | 3917798.00 | $18.22M | 2026-03-31 |
| Western Standard LLC | 2247591.00 | $10.45M | 2026-03-31 |
| VANGUARD CAPITAL MANAGEMENT LLC | 1945076.00 | $9.04M | 2026-03-31 |
| Prescott Group Capital Management, L.L.C. | 1592587.00 | $7.41M | 2026-03-31 |
| Wolf Hill Capital Management, LP | 1470334.00 | $6.84M | 2026-03-31 |
| GENDELL JEFFREY L | 1413212.00 | $6.57M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-04-01 | |
| Sell | null | 2026-04-01 | |
| Sell | null | 2026-04-01 | |
| Sell | null | 2026-04-01 | |
| Sell | null | 2026-04-01 | |
| Sell | null | 2026-04-01 | |
| Sell | null | 2026-03-23 | |
| Sell | null | 2026-03-23 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.