PRTA PROTHENA CORP PUBLIC LTD CO: institutional ownership and insider trading
205 funds reported holding $499M of PROTHENA CORP PUBLIC LTD CO in their latest 13F filings; in Q2 2026 funds net bought $5.43M, with 27 new positions and 22 funds selling out; over the last 12 months insiders bought $10.9M and sold $136K on the open market; over its last four quarters it reported revenue of $54.5M and net income of −$44.0M.
PRTA revenue and earnings
- Quarter ended Jun 30, 2026: revenue $1.01M, net income −$18.6M, EPS -0.36
- Quarter ended Mar 31, 2026: revenue $51.1M, net income $32.7M, EPS 0.60
- Quarter ended Dec 31, 2025: revenue $21.0K, net income −$21.6M, EPS -0.39
- Quarter ended Sep 30, 2025: revenue $2.42M, net income −$36.5M, EPS -0.68
Famous investors holding PRTA
- D. E. Shaw (D. E. Shaw & Co.): $15.8M, 0.0% of the portfolio
- Two Sigma (Two Sigma Investments): $12.4M, 0.0% of the portfolio
- Renaissance Technologies (Renaissance Technologies): $6.83M, 0.0% of the portfolio
- Ken Griffin (Citadel Advisors): $5.85M, 0.0% of the portfolio
- Izzy Englander (Millennium Management): $1.47M, 0.0% of the portfolio
Largest institutional holders of PRTA
- FMR LLC — $70.5M
- Rubric Capital Management LP — $49.0M
- BlackRock, Inc. (BLK) — $47.7M
- STATE STREET CORP (STT, STT-PG) — $23.4M
- VANGUARD GROUP INC — $20.4M
- ACADIAN ASSET MANAGEMENT LLC — $19.7M
- VANGUARD PORTFOLIO MANAGEMENT LLC — $16.2M
- D. E. Shaw & Co., Inc. — $15.8M
- ADAR1 Capital Management, LLC — $15.2M
- TWO SIGMA INVESTMENTS, LP — $12.4M
Recent PRTA insider trades
- Oct 14, 2026: Scully William P bought 110,000 shares ($920K)
- Oct 8, 2026: Scully William P bought 215,000 shares ($1.82M)
- Oct 2, 2026: Scully William P bought 100,000 shares ($857K)
- Sep 29, 2026: Scully William P bought 162,000 shares ($1.41M)
5%+ owners
- FMR LLC: 13.8% (Schedule 13G/A, filed Aug 6, 2026)
- SCULLY WILLIAM P: 10.3% (Schedule 13G/A, filed May 11, 2026)
- Fennell Todd W.: 10.2% (Schedule 13G/A, filed Aug 19, 2026)
- Rubric Capital Management LP: 9.3% (Schedule 13G/A, filed May 15, 2026)
- BlackRock, Inc.: 6.9% (Schedule 13G/A, filed Jul 29, 2026)
Who owns the most PRTA stock?
The largest institutional holders of PROTHENA CORP PUBLIC LTD CO in the latest 13F filings are FMR LLC ($70.5M), Rubric Capital Management LP ($49.0M), BlackRock, Inc. (BLK) ($47.7M).
Are insiders buying or selling PRTA?
Over the last 12 months insiders bought $10.9M and sold $136K of PROTHENA CORP PUBLIC LTD CO stock on the open market (SEC Form 4).
Which famous investors own PRTA?
D. E. Shaw, Two Sigma, Renaissance Technologies, Ken Griffin, Izzy Englander.
What was PRTA's revenue last quarter?
PROTHENA CORP PUBLIC LTD CO reported revenue of $1.01M for the quarter ended June 30, 2026, with net income of −$18.6M.
Which ETFs hold PRTA?
2 ETFs and mutual funds hold it among their top 100 positions, including QQQS, IBRN.