AMBAC FINANCIAL GROUP INC (AMBC) Institutional Shareholders
AMBAC FINANCIAL GROUP INC (AMBC) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $188.93M in AMBC holdings during the latest filing period.
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
144
Total Reported Value
$188.93M
Largest Holder
Blackrock, Inc.
Largest Position
$28.53M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
113
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% | |
| Prescott Group Capital Management, L.L.C. | 0.89% | 1,647,793 | $10,282,228 | $14,879,571 | +$4,597,343 | +44.71% | |
| Third Avenue Management | Marty Whitman | 1.34% | 1,341,879 | $8,373,325 | $12,117,167 | +$3,743,842 | +44.71% |
| 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% | |
| Essex Investment Management Co Llc | 0.44% | 539,289 | $3,365,163 | $4,869,780 | +$1,504,617 | +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% | |
| Ipg Investment Advisors Llc | 0.27% | 303,930 | $1,896,523 | $2,744,488 | +$847,965 | +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% | |
| 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% |
Frequently asked questions about AMBC
Who owns the most AMBC stock?
The largest holders of AMBC are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for AMBAC FINANCIAL GROUP INC (AMBC).
Is AMBC widely held by superinvestors?
Many widely followed stocks like AMBC appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly AMBC is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.