Who Owns AMBAC FINANCIAL GROUP INC (OSG)? -- Institutional Holders (2026-06-30)

181 institutions reported holding $200.2M of AMBAC FINANCIAL GROUP INC (OSG) in SEC 13F filings for 2026-06-30. Largest institutional holders: BlackRock, Inc. ($28.5M), VANGUARD GROUP INC ($17.0M), Western Standard LLC ($14.0M), Prescott Group Capital Management, L.L.C. ($10.3M), THIRD AVENUE MANAGEMENT LLC ($8.4M). Source: SEC Form 13F.

Rank	Institution	Value	Shares	Change
1	BlackRock, Inc.	$28.5M	4.6M	Added
2	VANGUARD GROUP INC	$17.0M	2.7M	Added
3	Western Standard LLC	$14.0M	2.2M	Hold
4	Prescott Group Capital Management, L.L.C.	$10.3M	1.6M	Added
5	THIRD AVENUE MANAGEMENT LLC	$8.4M	1.3M	Added
6	Bain Capital Credit, LP	$6.9M	1.1M	Hold
7	GEODE CAPITAL MANAGEMENT, LLC	$6.9M	1.1M	Added
8	SUSQUEHANNA INTERNATIONAL GROUP, LLP	$6.8M	1.1M	Added
9	Caption Management, LLC	$5.6M	901,436	Trimmed
10	STATE STREET CORP	$5.6M	898,673	Trimmed
11	DIMENSIONAL FUND ADVISORS LP	$4.5M	716,947	Trimmed
12	JACOBS LEVY EQUITY MANAGEMENT, INC	$4.1M	649,530	Trimmed
13	MARSHALL WACE, LLP	$3.8M	601,796	Trimmed
14	ZACKS INVESTMENT MANAGEMENT	$3.7M	590,370	New
15	Bracebridge Capital, LLC	$3.6M	579,234	Hold
16	MORGAN STANLEY	$3.6M	569,563	Added
17	GOLDMAN SACHS GROUP INC	$3.5M	560,756	Added
18	RIHO Partners, LLC	$3.5M	554,818	Added
19	ESSEX INVESTMENT MANAGEMENT CO LLC	$3.4M	539,289	Added
20	CITADEL ADVISORS LLC	$3.3M	530,477	Trimmed
21	GENDELL JEFFREY L	$3.1M	494,092	Trimmed
22	Wolf Hill Capital Management, LP	$3.0M	480,187	Trimmed
23	Nuveen, LLC	$2.7M	428,165	Trimmed
24	Sixth Street Partners Management Company, L.P.	$2.4M	377,869	New
25	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	$2.4M	377,869	Added

Source: SEC Form 13F filings · as of 2026-06-30