Prothena Corp Public Ltd Co
PRTA- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001559053
In the last 90 days, Prothena Corp Public Ltd Co insiders filed 4 open-market purchases and 2 sales; 187 institutions reported holding it in 13F filings for Q2 2026, worth $465.6M in total; no superinvestor holds it.
Key figures
- Insider buysLast 90 days, $1.86M in total
- 4
- Insider sellsLast 90 days, $136.0K in total
- 2
- 13F holdersQ2 2026, +5 vs. previous quarter
- 187
- 13F valueReported value at the end of Q2 2026
- $465.6M
- Superinvestors holdingAt the end of Q2 2026
- 0
Price chart
Superinvestors holding PRTA, Q2 2026
No superinvestor reported holding PRTA at the end of Q2 2026.
Latest insider trades
Open-market purchases and sales by Prothena Corp Public Ltd Co insiders from Form 4, newest first.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Sep 21, 2026 (view filing)4:23 PM ET | Sep 18 | 3 days | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +100.0K | $8.43 | +$843.5K | +12.1%927.0K after | |
| Sep 3, 2026 (view filing)6:23 PM ET | Sep 2 | 1 day | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +27.0K | $9.47 | +$255.7K | +3.4%827.0K after | |
| Aug 21, 2026 (view filing)2:32 PM ET | Aug 20 | 1 day | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +50.0K | $8.79 | +$439.4K | +6.7%800.0K after | |
| Aug 10, 2026 (view filing)3:24 PM ET | Aug 7 | 3 days | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +34.0K | $8.62 | +$293.1K | +4.5%790.0K after | |
| Aug 10, 2026 (view filing)3:24 PM ET | Aug 7 | 3 days | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +3.50K | $8.62 | +$30.2K | +4.4%83.5K after | |
| Jul 30, 2026 (view filing)8:31 PM ET | Jul 29 | 1 day | Kingston Anne EvansChief Strategy Officer | SSaleOrdinary Shares, par value $0.01 per share | −7.66K | $8.47 | −$64.9K | −12.1%55.8K after | 10b5-1 |
| Jul 30, 2026 (view filing)8:30 PM ET | Jul 29 | 1 day | Isaacs Michael JohnGeneral Counsel & Company Sec. | SSaleOrdinary Shares, par value $0.01 per share | −8.39K | $8.47 | −$71.1K | −19.0%35.7K after | 10b5-1 |
| Jun 18, 2026 (view filing) | Jun 16 | 2 days | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +20.0K | $7.90 | +$158.0K | +2.7%756.0K after | |
| Jun 12, 2026 (view filing) | Jun 11 | 1 day | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +125.0K | $8.17 | +$1.02M | +13.4%1.06M after | |
| Jun 5, 2026 (view filing) | Jun 4 | 1 day | Scully William P10% Owner | PPurchaseOrdinary Shares, par value $0.01 per share | +50.0K | $9.31 | +$465.5K | +5.6%936.0K after |
Top 10 13F holders, Q2 2026
The largest institutional positions in Prothena Corp Public Ltd Co at the end of Q2 2026; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| FMR LLC | 7,199,218 | $70.5M | 0.00% | −352,000−4.7% | Reduced |
| Rubric Capital Management LP | 5,000,000 | $49.0M | 0.45% | 00.0% | Unchanged |
| BlackRock, Inc. | 4,867,955 | $47.7M | 0.00% | +223,795+4.8% | Added |
| State Street Corp | 2,393,424 | $23.4M | 0.00% | +454,926+23.5% | Added |
| Acadian Asset Management LLC | 2,010,645 | $19.7M | 0.02% | +463,052+29.9% | Added |
| Vanguard Portfolio Management LLC | 1,651,293 | $16.2M | 0.00% | +205,314+14.2% | Added |
| D. E. Shaw & Co., Inc. | 1,611,457 | $15.8M | 0.01% | −151,890−8.6% | Reduced |
| ADAR1 Capital Management, LLC | 1,554,535 | $15.2M | 0.72% | −26,908−1.7% | Reduced |
| Two Sigma Investments, LP | 1,264,987 | $12.4M | 0.01% | +59,009+4.9% | Added |
| Palo Alto Investors LP | 1,143,155 | $11.2M | 1.55% | −65,413−5.4% | Reduced |