Renaissance Technologies (RenTech)'s PRTA Position Overview
Renaissance Technologies (RenTech) (via Renaissance Technologies LLC) currently holds 607,515 shares of Prothena Corporation plc (PRTA) worth $5.91 M, representing 0.01% of the portfolio. First purchased in 2013-Q4, 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 PRTA, representing a significant commitment to this investment thesis. Largest addition occurred in Q2 2020, adding 303,062 shares. Largest reduction occurred in Q4 2022, reducing 162,000 shares.
Analysis based on 13F filings available since 2013 Q2
Renaissance Technologies (RenTech)'s Prothena Corporation plc (PRTA) Holding Value Over Time
Track share changes against reported price movement
Quarterly Prothena Corporation plc (PRTA) Trades by Renaissance Technologies (RenTech)
| Report Date | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q1 2026 | +172,000 | Add 39.49% | 607,515 | $9.72 |
| Q4 2025 | +64,215 | Add 17.29% | 435,515 | $9.55 |
| Q3 2025 | +281,100 | Add 311.64% | 371,300 | $9.76 |
| Q2 2025 | -149,700 | Reduce 62.40% | 90,200 | $6.07 |
| Q1 2025 | +38,000 | Add 18.82% | 239,900 | $12.38 |
| Q4 2024 | +19,100 | Add 10.45% | 201,900 | $13.85 |
| Q3 2024 | -146,700 | Reduce 44.52% | 182,800 | $16.73 |
| Q2 2024 | -60,200 | Reduce 15.45% | 329,500 | $20.64 |
| Q1 2024 | +53,900 | Add 16.05% | 389,700 | $24.77 |
| Q4 2023 | +75,200 | Add 28.86% | 335,800 | $36.34 |
| Q3 2023 | -63,200 | Reduce 19.52% | 260,600 | $48.25 |
| Q2 2023 | -83,500 | Reduce 20.50% | 323,800 | $0.07 |
| Q1 2023 | -67,600 | Reduce 14.23% | 407,300 | $0.05 |
| Q4 2022 | -162,000 | Reduce 25.44% | 474,900 | $0.06 |
| Q3 2022 | -49,100 | Reduce 7.16% | 636,900 | $60.63 |
| Q2 2022 | +291,800 | Add 74.02% | 686,000 | $27.15 |
| Q1 2022 | +127,400 | Add 47.75% | 394,200 | $36.57 |
| Q4 2021 | +9,600 | Add 3.73% | 266,800 | $49.40 |
| Q3 2021 | +18,900 | Add 7.93% | 257,200 | $71.23 |
| Q2 2021 | -50,700 | Reduce 17.54% | 238,300 | $51.41 |
| Q1 2021 | -25,000 | Reduce 7.96% | 289,000 | $25.12 |
| Q4 2020 | +48,800 | Add 18.40% | 314,000 | $12.01 |
| Q3 2020 | -122,762 | Reduce 31.64% | 265,200 | $9.99 |
| Q2 2020 | +303,062 | Add 356.96% | 387,962 | $10.46 |
| Q1 2020 | +15,800 | Add 22.87% | 84,900 | $10.69 |
| Q4 2019 | +24,100 | Add 53.56% | 69,100 | $15.83 |
| Q3 2019 | +45,000 | New Buy | 45,000 | $7.84 |
| Q2 2019 | -12,800 | Sold Out | 0 | $0.00 |
| Q1 2019 | +12,800 | New Buy | 12,800 | $12.11 |
| Q4 2018 | -57,400 | Sold Out | 0 | $0.00 |
| Q3 2018 | +57,400 | New Buy | 57,400 | $13.08 |
| Q1 2018 | -42,700 | Sold Out | 0 | $0.00 |
| Q4 2017 | +42,700 | New Buy | 42,700 | $37.49 |
| Q1 2016 | -90,600 | Sold Out | 0 | $0.00 |
| Q4 2015 | +54,200 | Add 148.90% | 90,600 | $68.11 |
| Q3 2015 | +36,400 | New Buy | 36,400 | $45.33 |
| Q4 2014 | -17,300 | Sold Out | 0 | $0.00 |
| Q3 2014 | -34,600 | Reduce 66.67% | 17,300 | $22.14 |
| Q2 2014 | -27,212 | Reduce 34.40% | 51,900 | $22.54 |
| Q1 2014 | +14,512 | Add 22.46% | 79,112 | $38.31 |
| Q4 2013 | +64,600 | New Buy | 64,600 | $26.52 |
Renaissance Technologies (RenTech)'s Prothena Corporation plc Investment FAQs
Renaissance Technologies (RenTech) first purchased Prothena Corporation plc (PRTA) in Q4 2013, acquiring 64,600 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 Prothena Corporation plc (PRTA) for 41 quarters since Q4 2013.
Renaissance Technologies (RenTech)'s largest addition to Prothena Corporation plc (PRTA) was in Q2 2020, adding 387,962 shares worth $4.06 M.
According to the latest 13F filing for Q1 2026, Renaissance Technologies (RenTech)'s firm, Renaissance Technologies LLC, owns 607,515 shares of Prothena Corporation plc (PRTA), valued at approximately $5.91 M.
As of the Q1 2026 filing, Prothena Corporation plc (PRTA) represents approximately 0.01% of Renaissance Technologies (RenTech)'s publicly disclosed stock portfolio, making it one of their key holdings.
Renaissance Technologies (RenTech)'s peak holding in Prothena Corporation plc (PRTA) was 686,000 shares, as reported at the end of Q2 2022.