Renaissance Technologies's ERII Position Overview
Renaissance Technologies (via Renaissance Technologies LLC) currently holds 102,985 shares of Energy Recovery, Inc. (ERII) worth $1.39 M, representing 0.00% of the portfolio. First purchased in 2013-Q2, this long-term strategic position has been held for 34 quarters.
Based on 13F filings, Renaissance Technologies has maintained a strategic position in ERII, demonstrating sustained confidence in this investment. Largest addition occurred in Q1 2017, adding 425,500 shares. Largest reduction occurred in Q4 2017, reducing 278,700 shares.
Analysis based on 13F filings available since 2013 Q2
Renaissance Technologies's Energy Recovery (ERII) Holding Value Over Time
Track share changes against reported price movement
Quarterly Energy Recovery (ERII) Trades by Renaissance Technologies
| Report Date | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q4 2025 | +47,385 | Add 85.22% | 102,985 | $13.49 |
| Q3 2025 | -85,500 | Reduce 60.60% | 55,600 | $15.42 |
| Q2 2025 | -100,400 | Reduce 41.57% | 141,100 | $12.78 |
| Q1 2025 | +51,100 | Add 26.84% | 241,500 | $15.89 |
| Q4 2024 | +190,400 | New Buy | 190,400 | $14.70 |
| Q2 2024 | -162,000 | Sold Out | 0 | $0.00 |
| Q1 2024 | +62,700 | Add 63.14% | 162,000 | $15.79 |
| Q4 2023 | +99,300 | New Buy | 99,300 | $18.84 |
| Q4 2022 | -49,500 | Sold Out | 0 | $0.00 |
| Q3 2022 | -40,200 | Reduce 44.82% | 49,500 | $21.74 |
| Q2 2022 | -49,300 | Reduce 35.47% | 89,700 | $19.42 |
| Q1 2022 | +139,000 | New Buy | 139,000 | $20.14 |
| Q4 2021 | -25,100 | Sold Out | 0 | $0.00 |
| Q3 2021 | +25,100 | New Buy | 25,100 | $19.04 |
| Q2 2021 | -15,400 | Sold Out | 0 | $0.00 |
| Q1 2021 | +15,400 | New Buy | 15,400 | $18.31 |
| Q3 2020 | -33,700 | Sold Out | 0 | $0.00 |
| Q2 2020 | -34,400 | Reduce 50.51% | 33,700 | $7.60 |
| Q1 2020 | -8,200 | Reduce 10.75% | 68,100 | $7.44 |
| Q4 2019 | -22,900 | Reduce 23.08% | 76,300 | $9.79 |
| Q3 2019 | +99,200 | New Buy | 99,200 | $9.26 |
| Q2 2019 | -40,800 | Sold Out | 0 | $0.00 |
| Q1 2019 | +40,800 | New Buy | 40,800 | $8.73 |
| Q4 2017 | -278,700 | Sold Out | 0 | $0.00 |
| Q3 2017 | -128,600 | Reduce 31.57% | 278,700 | $7.90 |
| Q2 2017 | -34,600 | Reduce 7.83% | 407,300 | $8.29 |
| Q1 2017 | +425,500 | Add 2594.51% | 441,900 | $8.32 |
| Q4 2016 | -7,500 | Reduce 31.38% | 16,400 | $10.37 |
| Q3 2016 | -244,200 | Reduce 91.09% | 23,900 | $15.98 |
| Q2 2016 | +126,300 | Add 89.07% | 268,100 | $8.89 |
| Q1 2016 | -13,900 | Reduce 8.93% | 141,800 | $10.34 |
| Q4 2015 | +155,700 | New Buy | 155,700 | $7.07 |
| Q3 2013 | -141,100 | Sold Out | 0 | $0.00 |
| Q2 2013 | +141,100 | Add 0.00% | 141,100 | $4.13 |
Renaissance Technologies's Energy Recovery Investment FAQs
Renaissance Technologies first purchased Energy Recovery, Inc. (ERII) in Q2 2013, acquiring 141,100 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 Energy Recovery, Inc. (ERII) for 34 quarters since Q2 2013.
Renaissance Technologies's largest addition to Energy Recovery, Inc. (ERII) was in Q1 2017, adding 441,900 shares worth $3.68 M.
According to the latest 13F filing for Q4 2025, Renaissance Technologies's firm, Renaissance Technologies LLC, owns 102,985 shares of Energy Recovery, Inc. (ERII), valued at approximately $1.39 M.
As of the Q4 2025 filing, Energy Recovery, Inc. (ERII) represents approximately 0.00% of Renaissance Technologies's publicly disclosed stock portfolio, making it one of their key holdings.
Renaissance Technologies's peak holding in Energy Recovery, Inc. (ERII) was 441,900 shares, as reported at the end of Q1 2017.