Prothena Corporation plc (PRTA) Ownership

20.56 ↓0.73 (-3.43%)

As of April 23, 2024, 3:59pm EST.

Institutions
Mutual Funds

Institutional Ownership

EcoR1 Capital, LLC is the biggest individual institutional holder of Prothena Corporation plc (PRTA), owning a total of 11.6 million shares. Combined, the top 33 institutional holders of PRTA own 96.06% of the company with a total of 51.5 million shares.

In the latest ownership report on December 31st 2023, the top 33 institutional holders increased their combined ownership of PRTA by 2.6 million shares. 15 institutions bought 3,316,707 total additional shares and increased their ownership by an average of 24.29%. However 3 institutions sold 697,538 total shares and decreased their ownership by an average of 19.96%.

Overall this is a positive sign as the number of shares owned by the top 20 institutional holders of Prothena Corporation plc increased by a net total of 2,619,169 in the latest quarter.

Institution Ownership Chart

Latest Institutional Ownership Changes

Owner	Percent Owned	Percent Change	Shares Owned	Share Change	Date Reported
EcoR1 Capital, LLC	21.564%	0.000%	11,584,280	0	2023-12-31
FMR Inc	14.985%	0.243%	8,049,796	19,506	2023-12-31
T. Rowe Price Associates, Inc.	7.888%	10.925%	4,237,351	417,338	2023-12-31
BlackRock Inc	7.019%	6.478%	3,770,650	229,406	2023-12-31
State Street Corporation	5.135%	30.723%	2,758,564	648,331	2023-12-31
Wellington Management Company LLP	4.829%	21.127%	2,594,102	452,455	2023-12-31
HHG PLC	3.790%	11.463%	2,035,984	209,375	2023-12-31
Palo Alto Investors, LLC	3.090%	0.157%	1,660,057	2,599	2023-12-31
First Light Asset Management, LLC	2.027%	-27.124%	1,088,801	-405,238	2023-12-31
Vanguard Group Inc	1.993%	3.859%	1,070,555	39,781	2023-12-31
Geode Capital Management, LLC	1.685%	5.362%	905,125	46,065	2023-12-31
Dimensional Fund Advisors, Inc.	1.615%	-21.329%	867,635	-235,227	2023-12-31
Goldman Sachs Group Inc	1.243%	166.684%	667,572	417,249	2023-12-31
Boxer Capital LLC	1.238%	6.400%	665,000	40,000	2023-12-31
Rock Springs Capital Management LP	1.164%	1.750%	625,048	10,750	2023-12-31
Artal Group S A	0.933%	0.000%	501,360	501,360	2023-12-31
Morgan Stanley - Brokerage Accounts	0.898%	79.372%	482,260	213,400	2023-12-31
Eventide Asset Management, LLC	0.829%	0.000%	445,155	0	2023-12-31
Bank of New York Mellon Corp	0.823%	-11.429%	442,309	-57,073	2023-12-31
Granahan Investment Management Inc..	0.777%	19.850%	417,157	69,092	2023-12-31

Top Institutions

Owner	Percent Owned	Percent Change	Shares Owned	Share Change	Date Reported
EcoR1 Capital, LLC	21.564%	0.000%	11,584,280	0	2023-12-31
FMR Inc	14.985%	0.243%	8,049,796	19,506	2023-12-31
T. Rowe Price Associates, Inc.	7.888%	10.925%	4,237,351	417,338	2023-12-31
BlackRock Inc	7.019%	6.478%	3,770,650	229,406	2023-12-31
State Street Corporation	5.135%	30.723%	2,758,564	648,331	2023-12-31
Wellington Management Company LLP	4.829%	21.127%	2,594,102	452,455	2023-12-31
HHG PLC	3.790%	11.463%	2,035,984	209,375	2023-12-31
Palo Alto Investors, LLC	3.090%	0.157%	1,660,057	2,599	2023-12-31
First Light Asset Management, LLC	2.027%	-27.124%	1,088,801	-405,238	2023-12-31
Vanguard Group Inc	1.993%	3.859%	1,070,555	39,781	2023-12-31
Geode Capital Management, LLC	1.685%	5.362%	905,125	46,065	2023-12-31
Dimensional Fund Advisors, Inc.	1.615%	-21.329%	867,635	-235,227	2023-12-31
T. Rowe Price Investment Management,Inc.	1.590%	-2.590%	853,479	-22,691	2023-09-30
Partner Fund Management LP	1.557%	8.008%	836,571	62,025	2023-09-30
Goldman Sachs Group Inc	1.243%	166.684%	667,572	417,249	2023-12-31
Boxer Capital LLC	1.238%	6.400%	665,000	40,000	2023-12-31
Rock Springs Capital Management LP	1.164%	1.750%	625,048	10,750	2023-12-31
Bank of America Corp	1.054%	363.908%	564,441	442,770	2023-03-31
Avidity Partners Management LP	0.997%	-49.916%	535,000	-533,200	2023-06-30
Redmile Group, LLC	1.018%	-28.607%	525,575	-210,600	2022-09-30
Artal Group S A	0.933%	0.000%	501,360	501,360	2023-12-31
Morgan Stanley - Brokerage Accounts	0.898%	79.372%	482,260	213,400	2023-12-31
Two Sigma Advisers, LLC	0.925%	7.569%	447,700	31,500	2022-06-30
Prosight Management, LP	0.835%	35.482%	447,092	117,092	2023-03-31
Eventide Asset Management, LLC	0.829%	0.000%	445,155	0	2023-12-31
Bank of New York Mellon Corp	0.823%	-11.429%	442,309	-57,073	2023-12-31
Nuveen Asset Management, LLC	0.814%	-1.297%	437,270	-5,746	2023-09-30
Granahan Investment Management Inc..	0.777%	19.850%	417,157	69,092	2023-12-31
JPMorgan Chase & Co	0.772%	26.348%	414,065	86,347	2023-06-30
Northern Trust Corp	0.764%	-0.517%	409,847	-2,128	2023-09-30
Renaissance Technologies Corp	0.772%	-14.235%	407,300	-67,600	2023-03-31
Maple Rock Capital Partners, Inc.	0.760%	0.000%	399,414	0	2022-12-31
Federated Hermes Inc	0.678%	7,675.640%	350,137	345,634	2022-09-30

Mutual Fund Ownership

Fidelity Growth Compy Commingled Pl O is the biggest individual fund holder of Prothena Corporation plc (PRTA), owning a total of 3.1 million shares. Combined, the top 40 mutual fund holders of PRTA own 62.31% of the company with a total of 33.3 million shares.

In the latest ownership report on February 29th 2024, the top 40 fund holders increased their combined ownership of PRTA by 34 thousand shares. 1 funds bought 36,420 total additional shares and increased their ownership by an average of 1.90%. However 3 funds sold 2,487 total shares and decreased their ownership by an average of 0.19%.

Overall this is a positive sign as the number of shares owned by the top 20 mutual funds holding Prothena Corporation plc increased by a net total of 33,933 in the latest report.

Mutual Funds Chart

Latest Mutual Fund Ownership Changes

Owner	Percent Owned	Percent Change	Shares Owned	Share Change	Date Reported
SPDR® S&P Biotech ETF	3.629%	1.904%	1,949,518	36,420	2024-02-29
iShares Russell 2000 ETF	1.904%	-0.016%	1,022,794	-167	2024-02-29
Vanguard Institutional Extnd Mkt Idx Tr	1.068%	-0.104%	573,535	-595	2024-02-29
iShares Biotechnology ETF	0.713%	-0.449%	382,751	-1,725	2024-02-29

Top Mutual Funds

Owner	Percent Owned	Percent Change	Shares Owned	Share Change	Date Reported
Fidelity Growth Compy Commingled Pl O	5.818%	2.110%	3,125,259	64,581	2024-01-31
Fidelity Growth Compy Commingled Pl 3	5.239%	0.104%	2,804,494	2,900	2023-07-31
Fidelity® Growth Company	4.323%	2.960%	2,320,145	66,700	2023-11-30
Fidelity Growth Company Fund	4.274%	-0.790%	2,295,765	-18,271	2024-01-31
SPDR® S&P Biotech ETF	3.629%	1.904%	1,949,518	36,420	2024-02-29
Vanguard Health Care Inv	3.318%	37.768%	1,782,583	488,685	2023-12-31
US Small-Cap Growth II Equity Comp	3.284%	3.744%	1,763,914	63,661	2023-12-31
T. Rowe Price New Horizons	3.284%	3.744%	1,763,914	63,661	2023-12-31
iShares Russell 2000 ETF	1.904%	-0.016%	1,022,794	-167	2024-02-29
Fidelity® Growth Company K6	1.605%	0.736%	861,531	6,290	2023-11-30
T. Rowe Price Health Sciences	1.578%	-3.778%	847,697	-33,286	2023-12-31
Fidelity Growth Company K6	1.517%	-2.291%	815,160	-19,110	2024-01-31
Fidelity Select Biotechnology	1.492%	0.000%	801,417	0	2024-01-31
Fidelity® Select Biotechnology	1.493%	-2.684%	801,417	-22,100	2023-11-30
Fidelity Series Growth Company	1.381%	0.014%	741,805	100	2024-01-31
Fidelity® Series Growth Company	1.382%	0.000%	741,705	0	2023-11-30
Janus Henderson Global Life Sciences	1.087%	24.151%	583,761	113,558	2023-12-31
Janus Henderson Global Life Sciences D	1.087%	24.151%	583,761	113,558	2023-12-31
Vanguard Institutional Extnd Mkt Idx Tr	1.068%	-0.104%	573,535	-595	2024-02-29
Vanguard Extended Market Index Investor	1.055%	-0.018%	564,975	-102	2023-08-31
Eventide Healthcare & Life Sciences I	0.829%	0.000%	445,155	0	2023-12-31
Janus Selection Global Life Science AUSD	0.821%	21.745%	441,067	78,780	2023-12-31
Janus Henderson Glb Life Scn I2 USD	0.798%	-2.844%	428,525	-12,542	2024-01-31
Fidelity Small Cap Index	0.782%	3.065%	420,059	12,492	2023-12-31
T. Rowe Price Integrated US Sm Gr Eq	0.779%	10.459%	418,230	39,600	2023-12-31
Fidelity® Small Cap Index	0.745%	2.767%	399,752	10,764	2023-10-31
iShares Biotechnology ETF	0.713%	-0.449%	382,751	-1,725	2024-02-29
TRP Integrated US Small-Cap Gr Eq	0.706%	22.681%	378,630	70,000	2023-09-30
iShares Russell 2000 Growth ETF	0.694%	0.000%	372,585	0	2023-12-29
Janus Global Life Science A USD	0.671%	0.000%	352,984	352,984	2022-12-31
DFA US Small Cap I	0.621%	0.000%	332,659	0	2023-07-31
T. Rowe Price Small-Cap Stock	0.629%	-0.300%	331,907	-1,000	2023-03-31
T. Rowe Price US Small-Cap Core Equity	0.629%	-0.300%	331,907	-1,000	2023-03-31
T. Rowe Price QM US Small-Cap Gr Eq	0.589%	0.000%	304,130	0	2022-12-31
T. Rowe Price New Horizons Tr-Z	0.457%	11.619%	236,143	24,582	2022-12-31
DFA US Micro Cap I	0.433%	0.000%	223,432	0	2022-11-30
Fidelity Advisor® Biotechnology I	0.418%	0.000%	202,400	0	2022-09-30
UBS (Lux) EF Biotech (USD) P-acc	0.390%	-8.319%	201,331	-18,269	2022-10-31
Federated Hermes MDT SCC Institutional	0.394%	0.000%	190,759	190,759	2022-09-30
Federated Hermes MDT Small Cap Core IS	0.394%	0.000%	190,759	190,759	2022-09-30