Prothena Corporation plc (PRTA) ownership: Top institutional holder: BlackRock Fund Advisors ($74.53M). Insider activity: Net Seller (4 buys, 16 sells). SEC EDGAR first-party data.
| Holder | Shares | Market Value | Reported |
|---|---|---|---|
| BlackRock Fund Advisors | 1515241.00 | $74.53M | 2016-12-31 |
| FMR LLC | 7551218.00 | $73.40M | 2026-03-31 |
| Rubric Capital Management LP | 5000000.00 | $48.60M | 2026-03-31 |
| BlackRock, Inc. | 4644160.00 | $45.14M | 2026-03-31 |
| VANGUARD GROUP INC | 2140909.00 | $20.45M | 2025-12-31 |
| STATE STREET CORP | 1938498.00 | $18.84M | 2026-03-31 |
| D. E. Shaw & Co., Inc. | 1763347.00 | $17.14M | 2026-03-31 |
| ADAR1 Capital Management, LLC | 1581443.00 | $15.37M | 2026-03-31 |
| Insider | Transaction | Value | Date |
|---|---|---|---|
| Sell | null | 2026-06-15 | |
| Buy | null | 2026-06-11 | |
| Buy | null | 2026-06-04 | |
| Sell | null | 2026-06-02 | |
| Buy | null | 2026-06-02 | |
| Sell | null | 2026-05-22 | |
| Buy | null | 2026-05-22 | |
| Sell | null | 2026-05-15 |
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Institutional data from SEC Form 13F. Insider data from SEC Form 4. Congressional data from STOCK Act disclosures. Not personalized investment advice.