Prothena (PRTA) Ownership - Who Owns Prothena?

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Prothena (PRTA) Ownership Overview

3.30% Insiders

20.06% Mutual Funds

23.70% Other Institutional Investors

9.59% ETFs

43.35% Public Companies and

Individual Investors

The ownership structure of Prothena (PRTA) stock is a mix of institutional, retail, and individual investors. Approximately 53.35% of the company’s stock is owned by Institutional Investors, 3.30% is owned by Insiders, and 43.35% is owned by Public Companies and Individual Investors.

The ownership structure of Prothena (PRTA) stock is a mix of institutional, retail, and individual investors. Approximately 43.76% of the company’s stock is owned by Institutional Investors, 3.30% is owned by Insiders, and 9.59% is owned by Public Companies and Individual Investors.

Recent Insider Trading Activity

Date	Name	Activity	Value
Jun 05, 2026	William Scully	xxxxxxxxxxxxx	$465000
Jun 03, 2026	William Scully	xxxxxxxxxxxxx	$471000
May 26, 2026	William Scully	xxxxxxxxxxxxx	$981000

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Recent Hedge Fund Trading Activity

Date	Firm	Activity	Value
Dec 31, 2023	Graham Capital Management, L.p.	xxxxxxxxxxxxx	$124610

Show More Hedge Fund Trading Activity >

Top Shareholders

# of Shares	Type	% Holding	Value
3,482,656	Institution	6.65%	30,612,546
1,883,268	Institution	3.60%	16,553,926
1,186,220	Institution	2.27%	10,426,874
1,068,000	Insider	2.04%	9,387,720
900,608	Institution	1.72%	7,916,344
887,002	Institution	1.69%	7,796,748
643,917	Institution	1.23%	5,660,030
617,222	Institution	1.18%	5,425,381
534,244	Institution	1.02%	4,696,005
484,194	Institution	0.92%	4,256,065

Top Mutual Fund Holders

# of Shares	Type	% Holding	Value
3,482,656	Institution	6.65%	30,612,546
887,002	Institution	1.69%	7,796,748
643,917	Institution	1.23%	5,660,030
617,222	Institution	1.18%	5,425,381
534,244	Institution	1.02%	4,696,005
484,194	Institution	0.92%	4,256,065
483,658	Institution	0.92%	4,251,354
456,369	Institution	0.87%	4,011,484
433,516	Institution	0.83%	3,810,606
333,148	Institution	0.64%	2,928,371

Top ETF Holders

Holder	# of Shares	Type	% Holding	Value
SPDR S&P BIOTECH ETF	1,085,714	Institution	2.07%	10,042,855
iShares Russell 2000 ETF	1,036,262	Institution	1.98%	9,108,743
Vanguard Extended Market ETF	502,743	Institution	0.96%	5,560,338
iShares Russell 2000 Value ETF	349,873	Institution	0.67%	3,075,384
iShares Biotechnology ETF	320,163	Institution	0.61%	2,814,233
Vanguard Russell 2000 ETF	222,947	Institution	0.43%	2,465,794
Schwab U.S. Small-Cap ETF	204,750	Institution	0.39%	1,893,938
U.S. Micro Cap Portfolio ETF	174,964	Institution	0.33%	1,700,650
Dimensional U.S. Small Cap ETF	158,718	Institution	0.30%	1,468,142
Vanguard Health Care ETF	136,660	Institution	0.26%	1,511,460

FAQ

Who Owns Prothena (PRTA)?

According to the latest TipRanks data, approximately 23.70% of the company's stock is held by institutional investors, 3.30% is held by insiders, and 43.35% is held by retail investors.

What percentage of Prothena (PRTA) stock is held by institutional investors?

According to the latest TipRanks data, approximately 23.70% of Prothena (PRTA) stock is held by institutional investors.

What percentage of Prothena (PRTA) stock is held by retail investors?

According to the latest TipRanks data, approximately 43.35% of Prothena (PRTA) stock is held by retail investors.

Who owns the most shares of Prothena (PRTA)?

Fidelity Mt. Vernon Street Trust owns the most shares of Prothena (PRTA).

What is the significance of the ownership structure for a publicly traded company?

The ownership structure can impact the company's decision making, as large institutional investors may exert influence on the company's management and can also affect the company's stock price with their buying and selling patterns.