Who Owns OCTAVE SPECIALTY GROUP INC (AMBC)? -- Institutional Holders (2026-03-31)
181 institutions reported holding $155.7M of OCTAVE SPECIALTY GROUP INC (AMBC) in SEC 13F filings for 2026-03-31. Largest institutional holders: BlackRock, Inc. ($18.2M), Western Standard LLC ($10.5M), VANGUARD CAPITAL MANAGEMENT LLC ($9.0M), Prescott Group Capital Management, L.L.C. ($7.4M), Wolf Hill Capital Management, LP ($6.8M). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|
| 1 | BlackRock, Inc. | $18.2M | 3.9M | Trimmed |
| 2 | Western Standard LLC | $10.5M | 2.2M | Trimmed |
| 3 | VANGUARD CAPITAL MANAGEMENT LLC | $9.0M | 1.9M | New |
| 4 | Prescott Group Capital Management, L.L.C. | $7.4M | 1.6M | Added |
| 5 | Wolf Hill Capital Management, LP | $6.8M | 1.5M | Trimmed |
| 6 | GENDELL JEFFREY L | $6.6M | 1.4M | Trimmed |
| 7 | THIRD AVENUE MANAGEMENT LLC | $6.2M | 1.3M | Added |
| 8 | DIMENSIONAL FUND ADVISORS LP | $6.1M | 1.3M | Trimmed |
| 9 | Bain Capital Credit, LP | $5.2M | 1.1M | Hold |
| 10 | MARSHALL WACE, LLP | $5.0M | 1.1M | Added |
| 11 | Caption Management, LLC | $4.8M | 1.0M | Trimmed |
| 12 | GEODE CAPITAL MANAGEMENT, LLC | $4.8M | 1.0M | Trimmed |
| 13 | STATE STREET CORP | $4.4M | 941,404 | Trimmed |
| 14 | JACOBS LEVY EQUITY MANAGEMENT, INC | $4.1M | 884,272 | Added |
| 15 | Nuveen, LLC | $3.7M | 800,253 | Trimmed |
| 16 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | $3.7M | 793,293 | Added |
| 17 | JANE STREET GROUP, LLC | $3.6M | 780,484 | Trimmed |
| 18 | Bracebridge Capital, LLC | $2.7M | 579,234 | Hold |
| 19 | RIHO Partners, LLC | $2.5M | 546,569 | New |
| 20 | CITADEL ADVISORS LLC | $2.5M | 540,609 | Trimmed |
| 21 | ESSEX INVESTMENT MANAGEMENT CO LLC | $1.9M | 418,203 | Added |
| 22 | GOLDMAN SACHS GROUP INC | $1.6M | 346,293 | Trimmed |
| 23 | IPG Investment Advisors LLC | $1.5M | 325,616 | New |
| 24 | Brooklyn Investment Group | $1.5M | 325,351 | New |
| 25 | NORTHERN TRUST CORP | $1.5M | 322,348 | Trimmed |
Source: SEC Form 13F filings · as of 2026-03-31