Cliff Asness's PRTA Position Overview
Cliff Asness (via Aqr Capital Management LLC) currently holds 204,016 shares of Prothena Corporation plc (PRTA) worth $1.98 M, representing 0.00% of the portfolio. First purchased in 2015-Q3, this long-term strategic position has been held for 26 quarters.
Based on 13F filings, Cliff Asness has maintained a strategic position in PRTA, demonstrating sustained confidence in this investment. Largest addition occurred in Q3 2025, adding 214,542 shares. Largest reduction occurred in Q4 2025, reducing 27,757 shares.
Analysis based on 13F filings available since 2013 Q2
Cliff Asness's Prothena Corporation plc (PRTA) Holding Value Over Time
Track share changes against reported price movement
Quarterly Prothena Corporation plc (PRTA) Trades by Cliff Asness
| Report Date | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q1 2026 | +17,231 | Add 9.23% | 204,016 | $9.72 |
| Q4 2025 | -27,757 | Reduce 12.94% | 186,785 | $9.55 |
| Q3 2025 | +214,542 | New Buy | 214,542 | $9.76 |
| Q1 2024 | -13,781 | Sold Out | 0 | $0.00 |
| Q4 2023 | -4,728 | Reduce 25.54% | 13,781 | $36.34 |
| Q3 2023 | -777 | Reduce 4.03% | 18,509 | $48.25 |
| Q2 2023 | +11,995 | Add 164.52% | 19,286 | $68.28 |
| Q1 2023 | +7,291 | New Buy | 7,291 | $48.47 |
| Q2 2022 | -8,363 | Sold Out | 0 | $0.00 |
| Q1 2022 | -1,554 | Reduce 15.67% | 8,363 | $36.59 |
| Q4 2021 | -3,429 | Reduce 25.69% | 9,917 | $49.41 |
| Q3 2021 | +8,429 | Add 171.43% | 13,346 | $71.26 |
| Q2 2021 | +4,917 | New Buy | 4,917 | $51.45 |
| Q3 2018 | -16,630 | Sold Out | 0 | $0.00 |
| Q2 2018 | -21,820 | Reduce 56.75% | 16,630 | $14.55 |
| Q4 2017 | -2,439 | Reduce 5.96% | 38,450 | $37.48 |
| Q3 2017 | -868 | Reduce 2.08% | 40,889 | $64.79 |
| Q2 2017 | +5,456 | Add 15.03% | 41,757 | $54.12 |
| Q1 2017 | -106 | Reduce 0.29% | 36,301 | $55.78 |
| Q4 2016 | -611 | Reduce 1.65% | 36,407 | $49.17 |
| Q3 2016 | +19,741 | Add 114.26% | 37,018 | $59.97 |
| Q2 2016 | -2,675 | Reduce 13.41% | 17,277 | $34.96 |
| Q1 2016 | -3,550 | Reduce 15.11% | 19,952 | $41.15 |
| Q4 2015 | +16,490 | Add 235.17% | 23,502 | $68.12 |
| Q3 2015 | +7,012 | New Buy | 7,012 | $45.35 |
Cliff Asness's Prothena Corporation plc Investment FAQs
Cliff Asness first purchased Prothena Corporation plc (PRTA) in Q3 2015, acquiring 7,012 shares, as reported in their 13F filing for that period. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
Cliff Asness has held Prothena Corporation plc (PRTA) for 26 quarters since Q3 2015.
Cliff Asness's largest addition to Prothena Corporation plc (PRTA) was in Q3 2025, adding 214,542 shares worth $2.09 M.
According to the latest 13F filing for Q1 2026, Cliff Asness's firm, Aqr Capital Management LLC, owns 204,016 shares of Prothena Corporation plc (PRTA), valued at approximately $1.98 M.
As of the Q1 2026 filing, Prothena Corporation plc (PRTA) represents approximately 0.00% of Cliff Asness's publicly disclosed stock portfolio, making it one of their key holdings.
Cliff Asness's peak holding in Prothena Corporation plc (PRTA) was 214,542 shares, as reported at the end of Q3 2025.