Institutional Ownership
Ambac Finl Group Inc
CUSIP 023139884COM NEWOSGQ1 2026
13D / 13G Filings
28
Schedule 13D/13G on record
Beneficial Filers
12
Distinct reporting persons
Largest Stake
16.1%
Max % of class reported
Institutional Holders
144
13F filers (latest quarter)
Beneficial Owners — Schedule 13D / 13G
28 filings · latest Feb 12, 2026
| # | Filed | Reporting Person | Form | % of Class | Shares | Filing |
|---|---|---|---|---|---|---|
| 1 | Feb 12, 2026 | Western Standard LLC | 13G | 5.9% | 2.57M | SEC |
| 2 | Feb 11, 2026 | Jane Street Group, LLC | 13G | 5.4% | 2.38M | SEC |
| 3 | Nov 13, 2025 | G1 Execution Services, LLC | 13G/A | 2.2% | 1.02M | SEC |
| 4 | Oct 17, 2025 | Blackrock, Inc. | 13G/A | 7.6% | 3.54M | SEC |
| 5 | Oct 9, 2025 | Dimensional Fund Advisors LP | 13G/A | 4.6% | 2.14M | SEC |
| 6 | Aug 14, 2025 | Sig Brokerage, LP | 13G | 5.1% | 2.38M | SEC |
| 7 | Apr 30, 2025 | The Vanguard Group | 13G/A | 5.8% | 2.66M | SEC |
| 8 | Apr 3, 2025 | Blackrock, Inc. | 13G/A | 8.7% | 4.00M | SEC |
| 9 | Jan 30, 2025 | The Vanguard Group | 13G/A | 6.8% | 3.22M | SEC |
| 10 | Nov 12, 2024 | Vanguard Group Inc | 13G/A | 8.7% | 4.12M | SEC |
18 more beneficial-ownership filings on Premium
See the full Schedule 13D/13G history for Ambac Finl Group Inc.
Unlock full historyTop Institutional Holders (13F)
Largest reported positions · latest quarter
| # | Fund | Shares | Value |
|---|---|---|---|
| 1 | Blackrock, Inc. | 3.92M | $18.22M |
| 2 | Western Standard LLC | 2.25M | $10.45M |
| 3 | Prescott Group Capital Management, L.L.C. | 1.59M | $7.41M |
| 4 | Wolf Hill Capital Management, LP | 1.47M | $6.84M |
| 5 | Gendell Jeffrey L | 1.41M | $6.57M |
| 6 | Third Avenue Management LLC | 1.34M | $6.24M |
| 7 | Dimensional Fund Advisors LP | 1.31M | $6.09M |
| 8 | Bain Capital Credit, LP | 1.11M | $5.15M |
| 9 | Marshall Wace, LLP | 1.07M | $4.95M |
| 10 | Geode Capital Management, LLC | 1.02M | $4.76M |