Renaissance Technologies (RenTech)'s ASPN Position Overview
Renaissance Technologies (RenTech) (via Renaissance Technologies LLC) currently holds 274,392 shares of Aspen Aerogels, Inc. (ASPN) worth $1.74 M, representing 0.00% of the portfolio. First purchased in 2015-Q3, this long-term strategic position has been held for 41 quarters.
Based on 13F filings since 2013, Renaissance Technologies (RenTech) has maintained a long-term strategic position in ASPN, representing a significant commitment to this investment thesis. Largest addition occurred in Q4 2024, adding 632,500 shares. Largest reduction occurred in Q3 2025, reducing 432,300 shares.
Analysis based on 13F filings available since 2013 Q2
Renaissance Technologies (RenTech)'s Aspen Aerogels (ASPN) Holding Value Over Time
Track share changes against reported price movement
Quarterly Aspen Aerogels (ASPN) Trades by Renaissance Technologies (RenTech)
| Report Date | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q2 2026 | +274,392 | New Buy | 274,392 | $6.34 |
| Q4 2025 | -246,900 | Sold Out | 0 | $0.00 |
| Q3 2025 | -432,300 | Reduce 63.65% | 246,900 | $6.96 |
| Q2 2025 | -84,900 | Reduce 11.11% | 679,200 | $5.92 |
| Q1 2025 | -2,300 | Reduce 0.30% | 764,100 | $6.39 |
| Q4 2024 | +632,500 | Add 472.37% | 766,400 | $11.88 |
| Q3 2024 | -215,800 | Reduce 61.71% | 133,900 | $27.69 |
| Q2 2024 | +349,700 | New Buy | 349,700 | $23.85 |
| Q3 2023 | -227,400 | Sold Out | 0 | $0.00 |
| Q2 2023 | +193,900 | Add 578.81% | 227,400 | $0.01 |
| Q1 2023 | -89,200 | Reduce 72.70% | 33,500 | $0.01 |
| Q4 2022 | -37,500 | Reduce 23.41% | 122,700 | $0.01 |
| Q3 2022 | +81,900 | Add 104.60% | 160,200 | $9.22 |
| Q2 2022 | +21,600 | Add 38.10% | 78,300 | $9.89 |
| Q1 2022 | +22,549 | Add 66.03% | 56,700 | $34.48 |
| Q4 2021 | -74,600 | Reduce 68.60% | 34,151 | $49.78 |
| Q3 2021 | -136,400 | Reduce 55.64% | 108,751 | $46.01 |
| Q2 2021 | -169,800 | Reduce 40.92% | 245,151 | $29.92 |
| Q1 2021 | -151,800 | Reduce 26.78% | 414,951 | $20.34 |
| Q4 2020 | -52,000 | Reduce 8.40% | 566,751 | $16.69 |
| Q3 2020 | -72,000 | Reduce 10.42% | 618,751 | $10.95 |
| Q2 2020 | +56,600 | Add 8.93% | 690,751 | $6.58 |
| Q1 2020 | +7,821 | Add 1.25% | 634,151 | $6.14 |
| Q4 2019 | +56,799 | Add 9.97% | 626,330 | $7.76 |
| Q3 2019 | +35,200 | Add 6.59% | 569,531 | $5.92 |
| Q2 2019 | -16,470 | Reduce 2.99% | 534,331 | $7.13 |
| Q1 2019 | +44,300 | Add 8.75% | 550,801 | $2.55 |
| Q4 2018 | +37,700 | Add 8.04% | 506,501 | $2.13 |
| Q3 2018 | -14,999 | Reduce 3.10% | 468,801 | $4.57 |
| Q2 2018 | +54,100 | Add 12.59% | 483,800 | $4.90 |
| Q1 2018 | +74,700 | Add 21.04% | 429,700 | $4.27 |
| Q4 2017 | +31,800 | Add 9.84% | 355,000 | $4.88 |
| Q3 2017 | +20,500 | Add 6.77% | 323,200 | $4.35 |
| Q2 2017 | +40,200 | Add 15.31% | 302,700 | $4.45 |
| Q1 2017 | +29,200 | Add 12.52% | 262,500 | $4.15 |
| Q4 2016 | -100 | Reduce 0.04% | 233,300 | $4.13 |
| Q3 2016 | +13,900 | Add 6.33% | 233,400 | $5.96 |
| Q2 2016 | +73,000 | Add 49.83% | 219,500 | $4.97 |
| Q1 2016 | +18,400 | Add 14.36% | 146,500 | $4.50 |
| Q4 2015 | +32,142 | Add 33.50% | 128,100 | $6.07 |
| Q3 2015 | +95,958 | New Buy | 95,958 | $7.50 |
Renaissance Technologies (RenTech)'s Aspen Aerogels Investment FAQs
Renaissance Technologies (RenTech) first purchased Aspen Aerogels, Inc. (ASPN) in Q3 2015, acquiring 95,958 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 Aspen Aerogels, Inc. (ASPN) for 41 quarters since Q3 2015.
Renaissance Technologies (RenTech)'s largest addition to Aspen Aerogels, Inc. (ASPN) was in Q4 2024, adding 766,400 shares worth $9.1 M.
According to the latest 13F filing for Q2 2026, Renaissance Technologies (RenTech)'s firm, Renaissance Technologies LLC, owns 274,392 shares of Aspen Aerogels, Inc. (ASPN), valued at approximately $1.74 M.
As of the Q2 2026 filing, Aspen Aerogels, Inc. (ASPN) 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 Aspen Aerogels, Inc. (ASPN) was 766,400 shares, as reported at the end of Q4 2024.