Which hedge funds own PRTA? PROTHENA CORP PLC, Q2 2026 13F holders
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28 of the hedge funds tracked by WhaleCreep disclosed a position in PRTA (PROTHENA CORP PLC) in their Q2 2026 13F filings, worth $139.9m in total. The largest holder by portfolio weight is Rangeley Capital, LLC at 3.8% of its book. 6 managers opened a new position this quarter: Diadema Partners LP, Persistent Asset Partners LTD, Aquatic Capital Management LLC, Engineers Gate Manager LP. 5 exited: Armistice Capital, LLC, Fox Run Management, L.L.C., Gsa Capital Partners LLP.
Who discovered PRTA first?
Earliest meaningful positions among the 12 tracked managers we observed opening PRTA since Q2 2013.
1 RA Capital Management, L.P. First reported Q2 2013 High conviction 1.0%initial weight · $6.4m Exitedby Q2 2014 · held 4q +197%stock since Q2 2013
Weight of RA Capital Management, L.P.'s 13F book in PRTA, by quarter
- 6.7% peak weight, Q4 2013
- $59.6m peak reported value
- 4 quarters held
- 50q before the median tracked entry
The stock's split-adjusted price moved +197% between Q2 2013 and Q1 2014, the last quarter this manager reported the position.
2 Scopia Capital Management LP First reported Q2 2018 1.0%initial weight · $51.2m Exitedby Q2 2019 · held 4q -17%stock since Q2 2018
Weight of Scopia Capital Management LP's 13F book in PRTA, by quarter
- 1.6% peak weight, Q4 2018
- $51.2m peak reported value
- 4 quarters held
- 30q before the median tracked entry
The stock's split-adjusted price moved -17% between Q2 2018 and Q1 2019, the last quarter this manager reported the position.
3 Avidity Partners Management LP First reported Q2 2021 · ≥1% from Q3 2022 0.3%initial weight · $9.4m Exitedby Q4 2023 · held 6q –stock change
Weight of Avidity Partners Management LP's 13F book in PRTA, by quarter
- 4.2% peak weight, Q4 2022
- $177.9m peak reported value
- 6 quarters held, in 2 separate spells
- 18q before the median tracked entry
27 managers already held PRTA when our coverage of them began
Holocene Advisors, LP (Q4 2017), Woodline Partners LP (Q4 2019), Rangeley Capital, LLC (Q1 2026), Birchview Capital, LP (Q1 2026), Palo Alto Investors LP (Q1 2026), Monimus Capital Management, LP (Q1 2026), Adar1 Capital Management, LLC (Q1 2026), Seven Fleet Capital Management LP (Q1 2026), Campbell & CO Investment Adviser LLC (Q1 2026), Quinn Opportunity Partners LLC (Q1 2026), D. E. Shaw & Co., Inc. (Q1 2026), Two Sigma Investments, LP (Q1 2026), Qube Research & Technologies LTD (Q1 2026), ExodusPoint Capital Management, LP (Q1 2026), Graham Capital Management, L.P. (Q1 2026), Trexquant Investment LP (Q1 2026), Squarepoint Ops LLC (Q1 2026), Schonfeld Strategic Advisors LLC (Q1 2026), Citadel Advisors LLC (Q1 2026), Marshall Wace, LLP (Q1 2026), Aqr Capital Management LLC (Q1 2026), Cva Family Office, LLC (Q1 2026), Armistice Capital, LLC (Q1 2026), Fox Run Management, L.L.C. (Q1 2026) and 3 more.
Their first filing on record already includes PRTA, so when they first bought it is unknown. They are not ranked above.
View discovery timeline
- Early holdersQ2 2013 – Q3 20225 new tracked holders · 2.8% of tracked managers holding at the end
- Emerging interestQ4 2022 – Q4 20251 new tracked holder · 2.9% of tracked managers holding at the end
- Established ownershipQ1 2026 – now6 new tracked holders · 2.4% of tracked managers holding now
Dots mark the ranked managers' first reported quarters. Price is the quarter-end price implied by 13F filings, split-adjusted, shown from Q4 2023 where the series is continuous. Coverage widened in Q1 2026 from about a hundred managers to over a thousand, so holders and new holders are shown relative to the managers filing each quarter.
How this is calculated
13F filings are quarterly snapshots of long US-listed equity positions. They do not show exact purchase dates, intra-quarter trading, short positions, most derivatives, or a manager's actual performance. "First reported" is the first quarter-end filing that shows the position.
A manager is ranked only if we observed it filing, without PRTA, within two quarters before its first position. Ranking is by the first quarter the position reached 1% of the manager's 13F book in a run of at least 2 filings, then by peak weight. "High conviction" means a peak weight of at least 5%.
Stock changes are the split-adjusted change in the quarter-end price implied by 13F filings, excluding dividends. They describe the stock over the period, not the return any manager earned. Phases are cut where the share of tracked managers holding PRTA passed one third and two thirds of its peak.
Which hedge funds hold PRTA? Current holders by portfolio weight
| Manager | As of | Weight of book | Value | Shares | Δ shares | Action |
|---|---|---|---|---|---|---|
| Rangeley Capital, LLC | Q2 2026 | 3.8% | $4.1m | 417,270 | -7% | reduced |
| Birchview Capital, LP | Q2 2026 | 2.1% | $4.4m | 449,019 | 0% | held |
| Palo Alto Investors LP | Q2 2026 | 1.5% | $11.2m | 1,143,155 | -5% | reduced |
| Monimus Capital Management, LP | Q2 2026 | 0.8% | $3.2m | 329,052 | -32% | reduced |
| Adar1 Capital Management, LLC | Q2 2026 | 0.7% | $15.2m | 1,554,535 | -2% | reduced |
| Diadema Partners LP | Q2 2026 | 0.5% | $1.5m | 149,482 | – | new |
| Rubric Capital Management LP | Q2 2026 | 0.4% | $49.0m | 5,000,000 | 0% | held |
| Persistent Asset Partners LTD | Q2 2026 | 0.1% | $373.0k | 38,100 | – | new |
| Seven Fleet Capital Management LP | Q2 2026 | 0.1% | $423.9k | 43,300 | 0% | held |
| Campbell & CO Investment Adviser LLC | Q2 2026 | 0.0% | $669.1k | 68,345 | -52% | reduced |
| Quinn Opportunity Partners LLC | Q2 2026 | 0.0% | $489.5k | 50,000 | 0% | held |
| D. E. Shaw & Co., Inc. | Q2 2026 | 0.0% | $15.8m | 1,611,457 | -9% | reduced |
| Two Sigma Investments, LP | Q2 2026 | 0.0% | $12.4m | 1,264,987 | 5% | added |
| Qube Research & Technologies LTD | Q2 2026 | 0.0% | $7.7m | 791,169 | 29% | added |
| Aquatic Capital Management LLC | Q2 2026 | 0.0% | $248.9k | 25,419 | – | new |
| ExodusPoint Capital Management, LP | Q2 2026 | 0.0% | $803.0k | 82,023 | 634% | added |
| Engineers Gate Manager LP | Q2 2026 | 0.0% | $404.0k | 41,270 | – | new |
| Graham Capital Management, L.P. | Q2 2026 | 0.0% | $181.1k | 18,496 | 44% | added |
| Trexquant Investment LP | Q2 2026 | 0.0% | $751.2k | 76,731 | 213% | added |
| Squarepoint Ops LLC | Q2 2026 | 0.0% | $2.2m | 223,971 | -3% | reduced |
| Schonfeld Strategic Advisors LLC | Q2 2026 | 0.0% | $492.9k | 50,350 | 306% | added |
| Citadel Advisors LLC | Q2 2026 | 0.0% | $3.3m | 338,810 | -22% | reduced |
| Marshall Wace, LLP | Q2 2026 | 0.0% | $1.9m | 190,834 | 328% | added |
| Aqr Capital Management LLC | Q2 2026 | 0.0% | $3.0m | 302,572 | 48% | added |
| Tudor Investment Corp ET AL | Q2 2026 | 0.0% | $239.3k | 24,445 | -0% | held |
| Quantbot Technologies LP | Q2 2026 | 0.0% | $15.8k | 1,611 | – | new |
| Quarry LP | Q2 2026 | 0.0% | $881 | 90 | – | new |
| Cva Family Office, LLC | Q2 2026 | 0.0% | $1.1k | 109 | 0% | held |
Exited since the previous quarter
| Manager | Prior weight | Prior value |
|---|---|---|
| Armistice Capital, LLC | 1.6% | $4.3m |
| Fox Run Management, L.L.C. | 0.1% | $324.2k |
| Gsa Capital Partners LLP | 0.1% | $316.0k |
| Walleye Capital LLC | 0.4% | $2.7m |
| Y-Intercept (Hong Kong) LTD | 0.1% | $979.8k |
Held in a manager's last filing on record
These managers have not filed for the latest quarter; their last disclosure is dated.
| Manager | Last filing | Weight |
|---|---|---|
| renaissance | Q2 2026 | 0.0% |
How has hedge fund ownership of PRTA changed?
| Quarter | Managers holding | Combined value |
|---|---|---|
| Q2 2026 | 29 | $146.7m |
| Q1 2026 | 29 | $154.4m |
| Q4 2025 | 4 | $47.7m |
| Q3 2025 | 4 | $25.2m |
| Q2 2025 | 2 | $717.5k |
| Q1 2025 | 1 | $3.0m |
| Q4 2024 | 2 | $3.2m |
| Q3 2024 | 2 | $3.5m |
| Q2 2024 | 2 | $7.4m |
| Q1 2024 | 2 | $9.7m |
| Q4 2023 | 2 | $13.2m |
| Q3 2023 | 3 | $41.6m |
| Q2 2023 | 5 | $76.4m |
| Q1 2023 | 5 | $89.2m |
| Q4 2022 | 6 | $245.2m |
| Q3 2022 | 4 | $187.3m |
Counts every tracked manager that disclosed PRTA in that quarter's filing, including managers that have since stopped filing.