Renaissance Technologies (RenTech)'s AMBC Position Overview
Renaissance Technologies (RenTech) (via Renaissance Technologies LLC) currently holds 227,726 shares of Octave Specialty Group, Inc. (AMBC) worth $1.06 M, representing 0.00% of the portfolio. First purchased in 2014-Q1, this long-term strategic position has been held for 46 quarters.
Based on 13F filings since 2013, Renaissance Technologies (RenTech) has maintained a long-term strategic position in AMBC, representing a significant commitment to this investment thesis. Largest addition occurred in Q2 2017, adding 261,700 shares. Largest reduction occurred in Q1 2015, reducing 284,400 shares.
Analysis based on 13F filings available since 2013 Q2
Renaissance Technologies (RenTech)'s Octave Specialty Group (AMBC) Holding Value Over Time
Track share changes against reported price movement
Quarterly Octave Specialty Group (AMBC) Trades by Renaissance Technologies (RenTech)
| Report Date | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q1 2026 | +202,568 | Add 805.18% | 227,726 | $4.65 |
| Q4 2025 | -64,042 | Reduce 71.80% | 25,158 | $7.78 |
| Q3 2025 | -96,900 | Reduce 52.07% | 89,200 | $8.34 |
| Q2 2025 | +14,600 | Add 8.51% | 186,100 | $7.10 |
| Q1 2025 | +47,300 | Add 38.08% | 171,500 | $8.75 |
| Q4 2024 | -165,300 | Reduce 57.10% | 124,200 | $12.65 |
| Q3 2024 | +172,256 | Add 146.92% | 289,500 | $11.21 |
| Q2 2024 | -47,100 | Reduce 28.66% | 117,244 | $12.82 |
| Q1 2024 | -22,400 | Reduce 12.00% | 164,344 | $15.63 |
| Q4 2023 | +61,200 | Add 48.75% | 186,744 | $16.48 |
| Q3 2023 | -100,800 | Reduce 44.53% | 125,544 | $12.06 |
| Q2 2023 | +144,500 | Add 176.56% | 226,344 | $0.01 |
| Q1 2023 | +62,900 | Add 332.03% | 81,844 | $0.02 |
| Q4 2022 | -41,956 | Reduce 68.89% | 18,944 | $0.02 |
| Q3 2022 | +60,900 | New Buy | 60,900 | $12.74 |
| Q1 2022 | -24,400 | Sold Out | 0 | $0.00 |
| Q4 2021 | -28,400 | Reduce 53.79% | 24,400 | $16.07 |
| Q3 2021 | +52,800 | New Buy | 52,800 | $14.32 |
| Q4 2020 | -97,300 | Sold Out | 0 | $0.00 |
| Q3 2020 | +39,400 | Add 68.05% | 97,300 | $12.77 |
| Q2 2020 | -55,500 | Reduce 48.94% | 57,900 | $14.32 |
| Q1 2020 | -69,100 | Reduce 37.86% | 113,400 | $12.34 |
| Q4 2019 | +72,200 | Add 65.46% | 182,500 | $21.57 |
| Q3 2019 | -110,700 | Reduce 50.09% | 110,300 | $19.55 |
| Q2 2019 | -64,200 | Reduce 22.51% | 221,000 | $16.85 |
| Q1 2019 | -400 | Reduce 0.14% | 285,200 | $18.12 |
| Q4 2018 | -21,400 | Reduce 6.97% | 285,600 | $17.24 |
| Q3 2018 | -63,200 | Reduce 17.07% | 307,000 | $20.42 |
| Q2 2018 | +60,800 | Add 19.65% | 370,200 | $19.85 |
| Q1 2018 | +26,300 | Add 9.29% | 309,400 | $15.68 |
| Q4 2017 | -94,800 | Reduce 25.09% | 283,100 | $15.98 |
| Q3 2017 | -125,000 | Reduce 24.86% | 377,900 | $17.26 |
| Q2 2017 | +261,700 | Add 108.50% | 502,900 | $17.35 |
| Q1 2017 | +80,400 | Add 50.00% | 241,200 | $18.86 |
| Q4 2016 | +10,000 | Add 6.63% | 160,800 | $22.50 |
| Q3 2016 | +85,566 | Add 131.17% | 150,800 | $18.39 |
| Q2 2016 | -36,166 | Reduce 35.67% | 65,234 | $16.46 |
| Q1 2016 | +101,400 | New Buy | 101,400 | $15.80 |
| Q4 2015 | -174,500 | Sold Out | 0 | $0.00 |
| Q3 2015 | -55,700 | Reduce 24.20% | 174,500 | $14.47 |
| Q2 2015 | +3,100 | Add 1.37% | 230,200 | $16.64 |
| Q1 2015 | -284,400 | Reduce 55.60% | 227,100 | $24.20 |
| Q4 2014 | -76,900 | Reduce 13.07% | 511,500 | $24.50 |
| Q3 2014 | -15,500 | Reduce 2.57% | 588,400 | $22.10 |
| Q2 2014 | +170,100 | Add 39.21% | 603,900 | $27.31 |
| Q1 2014 | +433,800 | New Buy | 433,800 | $31.03 |
Renaissance Technologies (RenTech)'s Octave Specialty Group Investment FAQs
Renaissance Technologies (RenTech) first purchased Octave Specialty Group, Inc. (AMBC) in Q1 2014, acquiring 433,800 shares, as reported in their 13F filing for that period. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
Renaissance Technologies (RenTech) has held Octave Specialty Group, Inc. (AMBC) for 46 quarters since Q1 2014.
Renaissance Technologies (RenTech)'s largest addition to Octave Specialty Group, Inc. (AMBC) was in Q1 2014, adding 433,800 shares worth $13.46 M.
According to the latest 13F filing for Q1 2026, Renaissance Technologies (RenTech)'s firm, Renaissance Technologies LLC, owns 227,726 shares of Octave Specialty Group, Inc. (AMBC), valued at approximately $1.06 M.
As of the Q1 2026 filing, Octave Specialty Group, Inc. (AMBC) represents approximately 0.00% of Renaissance Technologies (RenTech)'s publicly disclosed stock portfolio, making it one of their key holdings.
Renaissance Technologies (RenTech)'s peak holding in Octave Specialty Group, Inc. (AMBC) was 603,900 shares, as reported at the end of Q2 2014.