Prothena Ownership | Who Owns Prothena?

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Prothena Ownership Summary

Prothena is owned by 94.64% institutional investors, 12.47% insiders. Ecor1 capital is the largest institutional shareholder, holding 21.57% of PRTA shares. Fidelity Growth Compy Commingled Pl S is the top mutual fund, with 6.19% of its assets in Prothena shares.

PRTA Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Prothena	94.64%	12.47%	-7.10%
Sector	Healthcare Stocks	88.01%	8.90%	3.09%
Industry	Biotech Stocks	109.70%	8.77%	-18.47%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Ecor1 capital	11.58M	21.57%	$239.10M
Fmr	8.07M	15.02%	$166.48M
Price t rowe associates inc /md/	4.24M	7.89%	$87.46M
Blackrock	3.86M	7.18%	$79.61M
Wellington management group llp	3.64M	6.78%	$75.12M
State street	1.93M	3.60%	$39.89M
Palo alto investors lp	1.67M	3.10%	$34.39M
Armistice capital	1.56M	2.90%	$32.20M
Vanguard group	1.17M	2.18%	$24.18M
Janus henderson group	1.03M	1.91%	$21.19M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Ecor1 capital	11.58M	7.31%	$239.10M
Palo alto investors lp	1.67M	3.99%	$34.39M
Birchview capital, lp	203.57K	3.89%	$4.20M
Finepoint capital lp	433.47K	2.54%	$8.95M
Prosight management, lp	286.93K	1.77%	$5.92M
Dcf advisers	107.50K	1.14%	$2.22M
Boxer capital	690.00K	0.75%	$14.24M
Artal group	1.00M	0.53%	$20.67M
Armistice capital	1.56M	0.41%	$32.20M
Rock springs capital management lp	625.05K	0.39%	$12.90M

Top Buyers

Holder	Shares	% Assets	Change
Armistice capital	1.56M	0.41%	464.00K
Morgan stanley	810.70K	0.00%	158.24K
Blackrock	3.86M	0.00%	138.27K
Prosight management, lp	286.93K	1.77%	116.46K
Pdt partners	102.71K	0.20%	102.71K

Top Sellers

Holder	Shares	% Assets	Change
State street	1.93M	0.00%	-1.54M
First light asset management	-	-	-444.95K
Ubs asset management americas	43.08K	0.00%	-332.09K
Millennium management	31.29K	0.00%	-290.95K
Janus henderson group	1.03M	0.01%	-283.03K

New Positions

Holder	Shares	% Assets	Change	Value
Pdt partners	102.71K	0.20%	102.71K	$2.12M
Two sigma investments, lp	71.56K	0.00%	71.56K	$1.48M
Norges bank	57.45K	0.00%	57.45K	$1.19M
Hennion & walsh asset management	52.28K	0.03%	52.28K	$724.13K
Federated hermes	43.86K	0.00%	43.86K	$905.29K

Sold Out

Holder	Change
Cypress capital	-2.00
Jfs wealth advisors	-2.00
First manhattan co. llc.	-3.00
Register financial advisors	-4.00
Global retirement partners	-7.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Sep 30, 2024	166	0.61%	50,906,096	0.22%	94	1.06%	71	-18.39%	45	9.76%
Jun 30, 2024	165	-4.07%	50,796,433	-4.91%	94	0.96%	87	12.99%	41	-34.92%
Mar 31, 2024	172	-16.91%	53,421,456	-0.25%	99	1.00%	77	-33.04%	63	31.25%
Dec 31, 2023	207	4.02%	53,553,037	1.29%	99	1.02%	115	10.58%	48	-4.00%
Sep 30, 2023	199	-7.87%	52,870,689	1.56%	98	1.03%	104	-2.80%	50	-12.28%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Fidelity Growth Compy Commingled Pl S	3.33M	6.19%	7.17K
Fidelity Growth Compy Commingled Pl O	3.28M	6.09%	1.22K
Vanguard Health Care Inv	3.25M	6.03%	851.12K
Fidelity Growth Company Fund	2.35M	4.37%	-4.46K
US Small-Cap Growth II Equity Comp	1.89M	3.51%	-1.63K
T. Rowe Price New Horizons	1.89M	3.51%	-
iShares Russell 2000 ETF	1.14M	2.11%	-4.35K
SPDR® S&P Biotech ETF	884.76K	1.64%	-10.33K
T. Rowe Price Integrated US SmCapGrEq	823.01K	1.53%	411.51K
Fidelity Growth Company K6	817.63K	1.52%	1.24K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Jan 24, 2024	Walker Karin L	Chief Accounting Officer	Sell	$170.00K
Dec 20, 2023	Walker Karin L	Chief Accounting Officer	Sell	$124.41K
Dec 20, 2023	Walker Karin L	Chief Accounting Officer	Sell	$61.54K
Nov 30, 2023	Walker Karin L	Chief Accounting Officer	Sell	$170.00K
Oct 25, 2023	Walker Karin L	Chief Accounting Officer	Sell	$72.04K

Insider Transactions Trends

Date	Buy	Sell
2024 Q4	-	-
2024 Q3	-	-
2024 Q2	-	-
2024 Q1	-	1
2023 Q4	-	10

PRTA Ownership FAQ

Who Owns Prothena?

Prothena shareholders are primarily institutional investors at 94.64%, followed by 12.47% insiders and -7.11% retail investors. The average institutional ownership in Prothena's industry, Biotech Stocks , is 109.70%, which Prothena falls below.

Who owns the most shares of Prothena?

Prothena’s largest shareholders are Ecor1 capital (11.58M shares, 21.57%), Fmr (8.07M shares, 15.02%), and Price t rowe associates inc /md/ (4.24M shares, 7.89%). Together, they hold 44.47% of Prothena’s total shares outstanding.

Does Blackrock own Prothena?

Yes, BlackRock owns 7.18% of Prothena, totaling 3.86M shares as of Jun 2024. This represents 0.00% of BlackRock's total assets, with a market value of 79.61M$. In the last quarter, BlackRock increased its holdings by 138.27K shares, a 3.72% change.

Who is Prothena’s biggest shareholder by percentage of total assets invested?

Ecor1 capital is Prothena’s biggest shareholder by percentage of total assets invested, with 7.31% of its assets in 11.58M Prothena shares, valued at 239.1M$.

Who is the top mutual fund holder of Prothena shares?

Fidelity Growth Compy Commingled Pl S is the top mutual fund holder of Prothena shares, with 6.19% of its total shares outstanding invested in 3.33M Prothena shares.

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