AMBAC FINANCIAL GROUP INC (AMBC) Stock Institutional Trading Activity


AMBAC FINANCIAL GROUP INC (AMBC) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Third Avenue Management, Renaissance Technologies LLC, TCI Fund Management, and Arbiter Partners Capital Management. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q4 2025Third Avenue ManagementBuy178,702782,093$6,084,684
Q4 2025Renaissance Technologies LLCSell-64,04225,158$195,729
Q3 2025Renaissance Technologies LLCSell-96,90089,200$743,928
Q2 2025Third Avenue ManagementBuy236,930603,391$4,284,076
Q2 2025Renaissance Technologies LLCBuy14,600186,100$1,321,310
Q1 2025Third Avenue ManagementBuy136,045366,461$3,206,534
Q1 2025Renaissance Technologies LLCBuy47,300171,500$1,500,625
Q4 2024Third Avenue ManagementBuy230,416230,416$2,914,762
Q4 2024Renaissance Technologies LLCSell-165,300124,200$1,571,130
Q3 2024Renaissance Technologies LLCBuy172,256289,500$3,245,295
Q2 2024Renaissance Technologies LLCSell-47,100117,244$1,503,068
Q1 2024Renaissance Technologies LLCSell-22,400164,344$2,569
Q4 2023Renaissance Technologies LLCBuy61,200186,744$3,078
Q3 2023Renaissance Technologies LLCSell-100,800125,544$1,514
Q2 2023Renaissance Technologies LLCBuy144,500226,344$3,223
Q1 2023Renaissance Technologies LLCBuy62,90081,844$1,267
Q4 2022Renaissance Technologies LLCSell-41,95618,944$330
Q3 2022Renaissance Technologies LLCBuy36,50060,900$776
Q4 2021Renaissance Technologies LLCSell-28,40024,400$392
Q3 2021Renaissance Technologies LLCSell-44,50052,800$756
Q3 2020Renaissance Technologies LLCBuy39,40097,300$1,243
Q2 2020Renaissance Technologies LLCSell-55,50057,900$829
Q1 2020Renaissance Technologies LLCSell-69,100113,400$1,399
Q4 2019Renaissance Technologies LLCBuy72,200182,500$3,937
Q3 2019Renaissance Technologies LLCSell-110,700110,300$2,156
Q2 2019Renaissance Technologies LLCSell-64,200221,000$3,724
Q1 2019Renaissance Technologies LLCSell-400285,200$5,168
Q4 2018Renaissance Technologies LLCSell-21,400285,600$4,924
Q3 2018Renaissance Technologies LLCSell-2,400307,000$6,269
Q1 2018Renaissance Technologies LLCBuy26,300309,400$4,851

Frequently asked questions about AMBC activity

  • Which institutional owners are buying AMBC?

    Institutional owners buying AMBC include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in AMBC activity?

    "Buy" means an investor increased their reported position in AMBC compared to the prior reporting period. This reflects growing exposure to AMBAC FINANCIAL GROUP INC (AMBC) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in AMBC increasing?

    Institutional interest in AMBC can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.