Renaissance Technologies's AMBC Position Overview
Renaissance Technologies (via Renaissance Technologies LLC) currently holds 89,200 shares of Octave Specialty Group, Inc. (AMBC) worth $743,928, representing 0.00% of the portfolio. First purchased in 2014-Q1, this long-term strategic position has been held for 47 quarters.
Based on 13F filings since 2013, Renaissance Technologies 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'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
| Period | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q1 2014 | +433,800 | New Buy | 433,800 | $31.03 |
| Q2 2014 | +170,100 | Add 39.21% | 603,900 | $27.31 |
| Q3 2014 | -15,500 | Reduce 2.57% | 588,400 | $22.10 |
| Q4 2014 | -76,900 | Reduce 13.07% | 511,500 | $24.50 |
| Q1 2015 | -284,400 | Reduce 55.60% | 227,100 | $24.20 |
| Q2 2015 | +3,100 | Add 1.37% | 230,200 | $16.64 |
| Q3 2015 | -55,700 | Reduce 24.20% | 174,500 | $14.47 |
| Q4 2015 | -174,500 | Sold Out | 174,500 | $0.00 |
| Q1 2016 | +101,400 | New Buy | 101,400 | $15.80 |
| Q2 2016 | -36,166 | Reduce 35.67% | 65,234 | $16.46 |
| Q3 2016 | +85,566 | Add 131.17% | 150,800 | $18.39 |
| Q4 2016 | +10,000 | Add 6.63% | 160,800 | $22.50 |
| Q1 2017 | +80,400 | Add 50.00% | 241,200 | $18.86 |
| Q2 2017 | +261,700 | Add 108.50% | 502,900 | $17.35 |
| Q3 2017 | -125,000 | Reduce 24.86% | 377,900 | $17.26 |
| Q4 2017 | -94,800 | Reduce 25.09% | 283,100 | $15.98 |
| Q1 2018 | +26,300 | Add 9.29% | 309,400 | $15.68 |
| Q2 2018 | +60,800 | Add 19.65% | 370,200 | $19.85 |
| Q3 2018 | -63,200 | Reduce 17.07% | 307,000 | $20.42 |
| Q4 2018 | -21,400 | Reduce 6.97% | 285,600 | $17.24 |
| Q1 2019 | -400 | Reduce 0.14% | 285,200 | $18.12 |
| Q2 2019 | -64,200 | Reduce 22.51% | 221,000 | $16.85 |
| Q3 2019 | -110,700 | Reduce 50.09% | 110,300 | $19.55 |
| Q4 2019 | +72,200 | Add 65.46% | 182,500 | $21.57 |
| Q1 2020 | -69,100 | Reduce 37.86% | 113,400 | $12.34 |
| Q2 2020 | -55,500 | Reduce 48.94% | 57,900 | $14.32 |
| Q3 2020 | +39,400 | Add 68.05% | 97,300 | $12.77 |
| Q4 2020 | -97,300 | Sold Out | 97,300 | $0.00 |
| Q3 2021 | +52,800 | New Buy | 52,800 | $14.32 |
| Q4 2021 | -28,400 | Reduce 53.79% | 24,400 | $16.07 |
| Q1 2022 | -24,400 | Sold Out | 24,400 | $0.00 |
| Q3 2022 | +60,900 | New Buy | 60,900 | $12.74 |
| Q4 2022 | -41,956 | Reduce 68.89% | 18,944 | $0.02 |
| Q1 2023 | +62,900 | Add 332.03% | 81,844 | $0.02 |
| Q2 2023 | +144,500 | Add 176.56% | 226,344 | $0.01 |
| Q3 2023 | -100,800 | Reduce 44.53% | 125,544 | $12.06 |
| Q4 2023 | +61,200 | Add 48.75% | 186,744 | $16.48 |
| Q1 2024 | -22,400 | Reduce 12.00% | 164,344 | $15.63 |
| Q2 2024 | -47,100 | Reduce 28.66% | 117,244 | $12.82 |
| Q3 2024 | +172,256 | Add 146.92% | 289,500 | $11.21 |
| Q4 2024 | -165,300 | Reduce 57.10% | 124,200 | $12.65 |
| Q1 2025 | +47,300 | Add 38.08% | 171,500 | $8.75 |
| Q2 2025 | +14,600 | Add 8.51% | 186,100 | $7.10 |
| Q3 2025 | -96,900 | Reduce 52.07% | 89,200 | $8.34 |
Renaissance Technologies's Octave Specialty Group Investment FAQs
Renaissance Technologies 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 has held Octave Specialty Group, Inc. (AMBC) for 47 quarters since Q1 2014. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
Renaissance Technologies's largest addition to Octave Specialty Group, Inc. (AMBC) was in Q1 2014, adding 433,800 shares worth $13.46 M. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
According to the latest 13F filing for Q3 2025, Renaissance Technologies's firm, Renaissance Technologies LLC, owns 89,200 shares of Octave Specialty Group, Inc. (AMBC), valued at approximately $743,928. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
As of the Q3 2025 filing, Octave Specialty Group, Inc. (AMBC) represents approximately 0.00% of Renaissance Technologies's publicly disclosed stock portfolio, making it one of their key holdings. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
Renaissance Technologies's peak holding in Octave Specialty Group, Inc. (AMBC) was 603,900 shares, as reported at the end of Q2 2014. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.