Steven Cohen's PRTA Position Overview
Steven Cohen (via Point72 Asset Management, L.P.) currently holds 399,830 shares of Prothena Corporation plc (PRTA) worth $3.89 M, representing 0.00% of the portfolio. First purchased in 2015-Q2, this long-term strategic position has been held for 21 quarters.
Based on 13F filings, Steven Cohen has maintained a strategic position in PRTA, demonstrating sustained confidence in this investment. Largest addition occurred in Q3 2025, adding 646,746 shares. Largest reduction occurred in Q1 2026, reducing 460,188 shares.
Analysis based on 13F filings available since 2013 Q2
Steven Cohen's Prothena Corporation plc (PRTA) Holding Value Over Time
Track share changes against reported price movement
Quarterly Prothena Corporation plc (PRTA) Trades by Steven Cohen
| Report Date | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q1 2026 | -460,188 | Reduce 53.51% | 399,830 | $9.72 |
| Q4 2025 | +213,272 | Add 32.98% | 860,018 | $9.55 |
| Q3 2025 | +646,746 | New Buy | 646,746 | $9.76 |
| Q4 2023 | -219,623 | Sold Out | 0 | $0.00 |
| Q3 2023 | +821 | Add 0.38% | 219,623 | $48.25 |
| Q2 2023 | -116,191 | Reduce 34.68% | 218,802 | $68.28 |
| Q1 2023 | +23,493 | Add 7.54% | 334,993 | $48.47 |
| Q4 2022 | +143,100 | Add 84.98% | 311,500 | $60.25 |
| Q3 2022 | +68,500 | Add 68.57% | 168,400 | $60.63 |
| Q2 2022 | -73,100 | Reduce 42.25% | 99,900 | $27.15 |
| Q1 2022 | -20,200 | Reduce 10.46% | 173,000 | $36.57 |
| Q4 2021 | +31,300 | Add 19.33% | 193,200 | $49.40 |
| Q3 2021 | -6,900 | Reduce 4.09% | 161,900 | $71.23 |
| Q2 2021 | +168,800 | New Buy | 168,800 | $51.41 |
| Q3 2020 | -265,573 | Sold Out | 0 | $0.00 |
| Q2 2020 | -250,470 | Reduce 48.54% | 265,573 | $10.46 |
| Q1 2020 | +193,743 | Add 60.11% | 516,043 | $10.70 |
| Q4 2019 | +322,300 | New Buy | 322,300 | $15.83 |
| Q4 2015 | -16,900 | Sold Out | 0 | $0.00 |
| Q3 2015 | -45,100 | Reduce 72.74% | 16,900 | $45.33 |
| Q2 2015 | +62,000 | New Buy | 62,000 | $52.68 |
Steven Cohen's Prothena Corporation plc Investment FAQs
Steven Cohen first purchased Prothena Corporation plc (PRTA) in Q2 2015, acquiring 62,000 shares, as reported in their 13F filing for that period. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
Steven Cohen has held Prothena Corporation plc (PRTA) for 21 quarters since Q2 2015.
Steven Cohen's largest addition to Prothena Corporation plc (PRTA) was in Q3 2025, adding 646,746 shares worth $6.31 M.
According to the latest 13F filing for Q1 2026, Steven Cohen's firm, Point72 Asset Management, L.P., owns 399,830 shares of Prothena Corporation plc (PRTA), valued at approximately $3.89 M.
As of the Q1 2026 filing, Prothena Corporation plc (PRTA) represents approximately 0.00% of Steven Cohen's publicly disclosed stock portfolio, making it one of their key holdings.
Steven Cohen's peak holding in Prothena Corporation plc (PRTA) was 860,018 shares, as reported at the end of Q4 2025.