Prothena Corporation plc (PRTA)

NMS – Real Time Price. Currency in USD

9.19

-0.03 (-0.33%)

Market open: Aug 12, 2026, 10:11 AM EDT

9.22

0.00 (0.00%)

Previous after-hours: Aug 11, 2026, 7:34 PM EDT

Ownership

Breakdown
20.55%	% of Shares Held by All Insider
93.42%	% of Shares Held by Institutions
117.58%	% of Float Held by Institutions
260	Number of Institutions Holding Shares

Holder	Shares	Date Reported	% Out	Value
FMR, LLC	7.55M	2026-03-31	14.42%	$66.15M
Rubric Capital Management LP	5.00M	2026-03-31	9.55%	$43.80M
Blackrock Inc.	4.64M	2026-03-31	8.87%	$40.68M
State Street Corporation	1.94M	2026-03-31	3.70%	$16.98M
Shaw D.E. & Co., Inc.	1.76M	2026-03-31	3.37%	$15.45M
Adar1 Capital Management, LLC	1.58M	2026-03-31	3.02%	$13.85M
Acadian Asset Management. LLC	1.55M	2026-03-31	2.96%	$13.56M
Vanguard Portfolio Management LLC	1.45M	2026-03-31	2.76%	$12.67M
Morgan Stanley	1.23M	2026-03-31	2.35%	$10.78M
Palo Alto Investors Lp	1.21M	2026-03-31	2.31%	$10.59M

Holder	Shares	Date Reported	% Out	Value
Fidelity Mt. Vernon Street Trust-Fidelity Growth Company Fund	2.23M	2026-06-30	4.26%	$19.52M
SPDR SERIES TRUST-State Street SPDR S&P Biotech ETF	1.45M	2026-06-30	2.77%	$12.68M
iShares Trust-iShares Russell 2000 ETF	1.17M	2026-06-30	2.24%	$10.26M
Fidelity Mt. Vernon Street Trust-Fidelity Series Growth Company Fund	738,005	2026-06-30	1.41%	$6.46M
TIAA-CREF Funds-Nuveen Quant Small Cap Equity Fund	652,130	2026-04-30	1.25%	$5.71M
Vanguard Explorer Fund	617,222	2026-04-30	1.18%	$5.41M
VANGUARD INDEX FUNDS-Vanguard Extended Market Index Fund	483,658	2026-03-31	0.92%	$4.24M
Fidelity Select Portfolios-Select Biotechnology Portfolio	481,917	2026-06-30	0.92%	$4.22M
Fidelity Salem Street Trust-Fidelity Small Cap Index Fund	440,138	2026-05-31	0.84%	$3.86M
Fidelity Mt. Vernon Street Trust-Fidelity Growth Company K6 Fund	415,044	2026-06-30	0.79%	$3.64M