AMBC Institutional Ownership & Shareholders
AMBAC FINANCIAL GROUP INC (AMBC) is currently held by 143 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $182.10M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of AMBC tracked by InsiderSet, reporting ownership valued at approximately $28.53M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $41.29M, representing an estimated gain of +44.71% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 54% of the total disclosed AMBC value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Western Standard Llc, Vanguard Capital Management Llc, and several other long-term asset managers with concentrated positions in AMBAC FINANCIAL GROUP INC (AMBC).
This page ranks the largest institutional AMBC shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
143
Total Reported Value
$182.10M
Largest Holder
Blackrock, Inc.
Largest Position
$28.53M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
98
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 4,572,516 | $28,532,501 | $41,289,819 | +$12,757,318 | +44.71% | |
| Western Standard Llc | 4.75% | 2,247,591 | $14,024,968 | $20,295,747 | +$6,270,779 | +44.71% | |
| Vanguard Capital Management Llc | 0.00% | 1,972,619 | $12,309,143 | $17,812,750 | +$5,503,607 | +44.71% | |
| Third Avenue Management | Marty Whitman | 1.34% | 1,341,879 | $8,373,325 | $12,117,167 | +$3,743,842 | +44.71% |
| Prescott Group Capital Management, L.L.C. | 0.72% | 1,930,145 | $7,990,800 | $17,429,209 | +$9,438,409 | +118.12% | |
| Bain Capital Credit, Lp | 1.88% | 1,108,012 | $6,913,995 | $10,005,348 | +$3,091,353 | +44.71% | |
| Geode Capital Management, Llc | 0.00% | 1,106,335 | $6,905,205 | $9,990,205 | +$3,085,000 | +44.68% | |
| State Street Corp | 0.00% | 898,673 | $5,607,720 | $8,115,017 | +$2,507,297 | +44.71% | |
| Dimensional Fund Advisors Lp | 0.00% | 716,947 | $4,474,177 | $6,474,031 | +$1,999,854 | +44.70% | |
| Jacobs Levy Equity Management, Inc | 0.01% | 649,530 | $4,053,067 | $5,865,256 | +$1,812,189 | +44.71% | |
| Marshall Wace, Llp | 0.00% | 601,796 | $3,755,206 | $5,434,218 | +$1,679,012 | +44.71% | |
| Zacks Investment Management | 0.03% | 590,370 | $3,683,920 | $5,331,041 | +$1,647,121 | +44.71% | |
| Bracebridge Capital, Llc | 0.78% | 579,234 | $3,614,420 | $5,230,483 | +$1,616,063 | +44.71% | |
| Morgan Stanley | 0.00% | 569,563 | $3,554,074 | $5,143,154 | +$1,589,080 | +44.71% | |
| Goldman Sachs Group Inc | 0.00% | 560,756 | $3,499,118 | $5,063,627 | +$1,564,509 | +44.71% | |
| Riho Partners, Llc | 1.95% | 554,818 | $3,462,064 | $5,010,007 | +$1,547,943 | +44.71% | |
| Gendell Jeffrey L | 0.03% | 494,092 | $3,083,134 | $4,461,651 | +$1,378,517 | +44.71% | |
| Wolf Hill Capital Management, Lp | 0.29% | 480,187 | $2,996,367 | $4,336,089 | +$1,339,722 | +44.71% | |
| Nuveen, Llc | 0.00% | 428,165 | $2,671,751 | $3,866,330 | +$1,194,579 | +44.71% | |
| Citadel Advisors Llc | 0.00% | 422,777 | $2,638,128 | $3,817,676 | +$1,179,548 | +44.71% | |
| Caption Management, Llc | 0.09% | 419,136 | $2,615,409 | $3,784,798 | +$1,169,389 | +44.71% | |
| Vanguard Portfolio Management Llc | 0.00% | 392,350 | $2,448,264 | $3,542,920 | +$1,094,656 | +44.71% | |
| Charles Schwab Investment Management Inc | 0.00% | 377,869 | $2,357,903 | $3,412,157 | +$1,054,254 | +44.71% | |
| Northern Trust Corp | 0.00% | 352,680 | $2,200,723 | $3,184,700 | +$983,977 | +44.71% | |
| Connor, Clark & Lunn Investment Management Ltd. | 0.00% | 302,913 | $1,890,177 | $2,735,304 | +$845,127 | +44.71% | |
| Vanguard Fiduciary Trust Co | 0.00% | 295,841 | $1,846,048 | $2,671,444 | +$825,396 | +44.71% | |
| Ayal Capital Advisors Ltd | 0.89% | 280,000 | $1,747,200 | $2,528,400 | +$781,200 | +44.71% | |
| Jane Street Group, Llc | 0.00% | 278,731 | $1,739,281 | $2,516,941 | +$777,660 | +44.71% | |
| Brooklyn Investment Group | 0.05% | 325,351 | $1,512,883 | $2,937,920 | +$1,425,037 | +94.19% | |
| Raymond James Financial Inc | 0.00% | 239,680 | $1,495,604 | $2,164,310 | +$668,706 | +44.71% | |
| Aqr Capital Management Llc | 0.00% | 229,890 | $1,434,513 | $2,075,907 | +$641,394 | +44.71% | |
| Prudential Financial Inc | 0.00% | 226,010 | $1,410,302 | $2,040,870 | +$630,568 | +44.71% | |
| Tudor Investment Corp Et Al | 0.01% | 216,362 | $1,350,099 | $1,953,749 | +$603,650 | +44.71% | |
| Ipg Investment Advisors Llc | 0.18% | 299,427 | $1,239,628 | $2,703,826 | +$1,464,198 | +118.12% | |
| Harbor Advisors Llc | 0.15% | 196,382 | $1,225,424 | $1,773,329 | +$547,905 | +44.71% | |
| Russell Investments Group, Ltd. | 0.00% | 195,046 | $1,217,090 | $1,761,265 | +$544,175 | +44.71% | |
| Quantinno Capital Management Lp | 0.00% | 190,283 | $1,187,366 | $1,718,255 | +$530,889 | +44.71% | |
| Legato Capital Management Llc | 0.09% | 181,037 | $1,129,671 | $1,634,764 | +$505,093 | +44.71% | |
| Ubs Group Ag | 0.00% | 147,197 | $918,509 | $1,329,189 | +$410,680 | +44.71% | |
| Gsa Capital Partners Llp | 0.06% | 143,566 | $896,000 | $1,296,401 | +$400,401 | +44.69% | |
| Susquehanna International Group, Llp | 0.00% | 136,692 | $852,958 | $1,234,329 | +$381,371 | +44.71% | |
| Bank Of New York Mellon Corp | 0.00% | 134,966 | $842,185 | $1,218,743 | +$376,558 | +44.71% | |
| Bank Of America Corp | 0.00% | 131,360 | $819,686 | $1,186,181 | +$366,495 | +44.71% | |
| Invesco Ltd. | 0.00% | 127,868 | $797,896 | $1,154,648 | +$356,752 | +44.71% | |
| Bridgeway Capital Management, Llc | 0.01% | 122,504 | $764,425 | $1,106,211 | +$341,786 | +44.71% | |
| Diametric Capital, Lp | 0.08% | 118,364 | $738,591 | $1,068,827 | +$330,236 | +44.71% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 117,200 | $731,328 | $1,058,316 | +$326,988 | +44.71% |
| Wells Fargo & Company/Mn | 0.00% | 116,707 | $728,250 | $1,053,864 | +$325,614 | +44.71% | |
| Price T Rowe Associates Inc | 0.00% | 116,612 | $728,000 | $1,053,006 | +$325,006 | +44.64% | |
| Hsbc Holdings Plc | 0.00% | 114,498 | $723,547 | $1,033,917 | +$310,370 | +42.90% |
Frequently asked questions about AMBC
Who are the largest institutional holders of AMBC?
The largest institutional holders of AMBC reported in the latest SEC Form 13F filings include Blackrock, Inc., Western Standard Llc, Vanguard Capital Management Llc, Third Avenue Management, and Prescott Group Capital Management, L.L.C.. InsiderSet ranks institutional holders by their latest reported AMBC position.
What is AMBC institutional ownership?
This page tracks AMBC positions reported by institutional investment managers through SEC Form 13F. AMBAC FINANCIAL GROUP INC (AMBC) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own AMBC?
InsiderSet currently tracks 143 institutional managers reporting AMBC holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of AMBC shareholders.
How much AMBC stock do institutions own?
Institutional investment managers disclosed approximately $182.10M in AMBC holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was AMBC institutional ownership last updated?
The latest AMBC institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional AMBC holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its AMBC position after the reporting date.
Are institutions buying or selling AMBC?
Institutional buying and selling can be analyzed by comparing AMBC positions across consecutive 13F reporting periods. InsiderSet's AMBC Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View AMBC ownership changes.
How has AMBC institutional ownership changed over time?
InsiderSet tracks AMBC institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.