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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- AMBAC FINANCIAL GROUP INC (AMBC) stock institutional ownership
- AMBAC FINANCIAL GROUP INC (AMBC) stock insider trading activity
- Stock rankings
| Portfolio quarter | Name | Type | Quantity | Remaining | Reported stock balance |
|---|---|---|---|---|---|
| Q4 2017 | Renaissance Technologies LLC | Sell | -94,800 | 283,100 | $4,524 |
| Q3 2017 | Renaissance Technologies LLC | Sell | -125,000 | 377,900 | $6,523 |
| Q2 2017 | Renaissance Technologies LLC | Buy | 261,700 | 502,900 | $8,725 |
| Q1 2017 | Renaissance Technologies LLC | Buy | 80,400 | 241,200 | $4,549 |
| Q4 2016 | Renaissance Technologies LLC | Buy | 10,000 | 160,800 | $3,618 |
| Q3 2016 | Renaissance Technologies LLC | Buy | 85,566 | 150,800 | $2,773 |
| Q2 2016 | Renaissance Technologies LLC | Sell | -36,166 | 65,234 | $1,074 |
| Q1 2016 | Renaissance Technologies LLC | Sell | -73,100 | 101,400 | $1,602 |
| Q3 2015 | Renaissance Technologies LLC | Sell | -55,700 | 174,500 | $2,525 |
| Q2 2015 | Renaissance Technologies LLC | Buy | 3,100 | 230,200 | $3,831 |
| Q2 2015 | TCI Fund Management | Buy | 1,985,785 | 1,985,785 | $33,043 |
| Q1 2015 | Renaissance Technologies LLC | Sell | -284,400 | 227,100 | $5,496 |
| Q4 2014 | Renaissance Technologies LLC | Sell | -76,900 | 511,500 | $12,532 |
| Q3 2014 | Renaissance Technologies LLC | Sell | -15,500 | 588,400 | $13,004 |
| Q2 2014 | Arbiter Partners Capital Management | Sell | -260,730 | 292,327 | $7,983 |
| Q2 2014 | Renaissance Technologies LLC | Buy | 170,100 | 603,900 | $16,493 |
| Q1 2014 | Arbiter Partners Capital Management | Sell | -212,141 | 553,057 | $17,161 |
| Q1 2014 | Renaissance Technologies LLC | Buy | 433,800 | 433,800 | $13,461 |
| Q4 2013 | Arbiter Partners Capital Management | Sell | -796,298 | 5,000 | $123 |
| Q4 2013 | Arbiter Partners Capital Management | Buy | 760,198 | 765,198 | $18,793 |
| Q3 2013 | Arbiter Partners Capital Management | Buy | 193,000 | 801,298 | $14,536 |
| Q2 2013 | Arbiter Partners Capital Management | Buy | 608,298 | 608,298 | $14,496 |
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.