Renaissance Technologies (RenTech)'s NEPH Position Overview
Renaissance Technologies (RenTech) (via Renaissance Technologies LLC) currently holds 99,400 shares of Nephros, Inc. (NEPH) worth $296,212, representing 0.00% of the portfolio. First purchased in 2020-Q2, this medium-term investment has been held for 17 quarters.
Based on 13F filings, Renaissance Technologies (RenTech) has maintained a strategic position in NEPH, demonstrating sustained confidence in this investment. Largest addition occurred in Q3 2025, adding 71,600 shares. Largest reduction occurred in Q4 2024, reducing 24,444 shares.
Analysis based on 13F filings available since 2013 Q2
Renaissance Technologies (RenTech)'s Nephros (NEPH) Holding Value Over Time
Track share changes against reported price movement
Quarterly Nephros (NEPH) Trades by Renaissance Technologies (RenTech)
| Report Date | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q1 2026 | -4,372 | Reduce 4.21% | 99,400 | $2.98 |
| Q4 2025 | +21,272 | Add 25.78% | 103,772 | $4.88 |
| Q3 2025 | +71,600 | Add 656.88% | 82,500 | $4.73 |
| Q2 2025 | +10,900 | New Buy | 10,900 | $4.09 |
| Q4 2024 | -24,444 | Sold Out | 0 | $0.00 |
| Q3 2024 | -16,556 | Reduce 40.38% | 24,444 | $1.71 |
| Q2 2024 | -200 | Reduce 0.49% | 41,000 | $2.11 |
| Q1 2024 | +41,200 | New Buy | 41,200 | $2.18 |
| Q3 2023 | -13,705 | Sold Out | 0 | $0.00 |
| Q2 2023 | -9,495 | Reduce 40.93% | 13,705 | $0.00 |
| Q1 2023 | -8,864 | Reduce 27.64% | 23,200 | $0.00 |
| Q4 2022 | +9,764 | Add 43.78% | 32,064 | $0.00 |
| Q3 2022 | +22,300 | New Buy | 22,300 | $0.90 |
| Q2 2022 | -20,317 | Sold Out | 0 | $0.00 |
| Q1 2022 | +20,317 | New Buy | 20,317 | $4.38 |
| Q3 2020 | -17,900 | Sold Out | 0 | $0.00 |
| Q2 2020 | +17,900 | New Buy | 17,900 | $8.38 |
Renaissance Technologies (RenTech)'s Nephros Investment FAQs
Renaissance Technologies (RenTech) first purchased Nephros, Inc. (NEPH) in Q2 2020, acquiring 17,900 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 Nephros, Inc. (NEPH) for 17 quarters since Q2 2020.
Renaissance Technologies (RenTech)'s largest addition to Nephros, Inc. (NEPH) was in Q3 2025, adding 82,500 shares worth $390,225.
According to the latest 13F filing for Q1 2026, Renaissance Technologies (RenTech)'s firm, Renaissance Technologies LLC, owns 99,400 shares of Nephros, Inc. (NEPH), valued at approximately $296,212.
As of the Q1 2026 filing, Nephros, Inc. (NEPH) 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 Nephros, Inc. (NEPH) was 103,772 shares, as reported at the end of Q4 2025.