Prothena Ownership | Who Owns Prothena?

Overview Forecast RevenueFinancials Chart Transcripts

Prothena Ownership Summary

Prothena is owned by 47.36% institutional investors, 13.48% insiders, and 39.16% retail investors. Ecor1 capital is the largest institutional shareholder, holding 21.54% of PRTA shares. Vanguard Health Care Inv is the top mutual fund, with 7.85% of its assets in Prothena shares.

PRTA Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Prothena	47.36%	13.48%	39.16%
Sector	Healthcare Stocks	57.39%	9.93%	32.68%
Industry	Biotech Stocks	68.48%	9.65%	21.87%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Ecor1 capital	11.58M	21.54%	$160.44M
Fmr	8.07M	15.01%	$111.79M
Wellington management group llp	5.13M	9.54%	$71.06M
Blackrock funding, inc. /de	4.12M	7.66%	$57.09M
Blackrock	3.86M	7.18%	$79.61M
Price t rowe associates inc /md/	3.69M	6.85%	$51.05M
Armistice capital	2.24M	4.16%	$30.97M
State street	1.93M	3.60%	$39.89M
Palo alto investors lp	1.74M	3.23%	$24.07M
Vanguard group	1.40M	2.61%	$19.44M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Ecor1 capital	11.58M	6.07%	$160.44M
Palo alto investors lp	1.74M	3.73%	$24.07M
Birchview capital, lp	304.57K	3.44%	$4.22M
Prosight management, lp	286.93K	1.77%	$5.92M
Boxer capital	690.00K	0.75%	$14.24M
Dcf advisers	103.50K	0.69%	$1.43M
Siren	1.10M	0.67%	$15.23M
Finepoint capital lp	657.07K	0.56%	$9.10M
Artal group	1.00M	0.53%	$20.67M
Armistice capital	2.24M	0.42%	$30.97M

Top Buyers

Holder	Shares	% Assets	Change
Wellington management group llp	5.13M	0.01%	952.09K
Armistice capital	2.24M	0.42%	586.00K
Federated hermes	746.18K	0.02%	341.27K
Ubs group	371.29K	0.00%	308.78K
Finepoint capital lp	657.07K	0.56%	223.60K

Top Sellers

Holder	Shares	% Assets	Change
State street	1.93M	0.00%	-1.54M
First light asset management	-	-	-444.95K
Granahan investment management	-	-	-312.52K
Ubs asset management americas	381.51K	0.00%	-145.24K
Deep track capital, lp	-	-	-140.00K

New Positions

Holder	Shares	% Assets	Change	Value
Susquehanna fundamental investments	80.68K	0.02%	80.68K	$1.12M
Boothbay fund management	62.00K	0.02%	62.00K	$858.73K
Norges bank	57.45K	0.00%	57.45K	$795.74K
Hennion & walsh asset management	52.28K	0.03%	52.28K	$724.13K
Massachusetts financial services co /ma/	44.81K	0.00%	44.81K	$620.69K

Sold Out

Holder	Change
Jfs wealth advisors	-2.00
Cypress capital	-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 %
Dec 31, 2024	107	-35.93%	25,474,325	-49.96%	47	0.53%	63	-12.50%	19	-57.78%
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%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Health Care Inv	4.22M	7.85%	978.33K
Fidelity Growth Compy Commingled Pl S	3.37M	6.27%	11.55K
Fidelity Growth Compy Commingled Pl O	3.28M	6.09%	1.22K
Fidelity Growth Company Fund	2.32M	4.31%	-
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	1.11M	2.06%	-9.57K
T. Rowe Price Integrated US SmCapGrEq	823.01K	1.53%	411.51K
Fidelity Growth Company K6	805.87K	1.50%	-11.55K
Fidelity Series Growth Company	758.90K	1.41%	-

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
2025 Q1	-	-
2024 Q4	-	-
2024 Q3	-	-
2024 Q2	-	-
2024 Q1	-	1

PRTA Ownership FAQ

Who Owns Prothena?

Prothena shareholders are primarily institutional investors at 47.36%, followed by 13.48% insiders and 39.16% retail investors. The average institutional ownership in Prothena's industry, Biotech Stocks , is 68.48%, which Prothena falls below.

Who owns the most shares of Prothena?

Prothena’s largest shareholders are Ecor1 capital (11.58M shares, 21.54%), Fmr (8.07M shares, 15.01%), and Wellington management group llp (5.13M shares, 9.54%). Together, they hold 46.08% 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 6.07% of its assets in 11.58M Prothena shares, valued at 160.44M$.

Who is the top mutual fund holder of Prothena shares?

Vanguard Health Care Inv is the top mutual fund holder of Prothena shares, with 7.85% of its total shares outstanding invested in 4.22M Prothena shares.

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