Prothena Corp Ownership & Insider Activity

Prothena Corp (PRTA) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 0.8% of shares outstanding. Institutional investors hold 42.2%. Over the past 90 days, insiders made 6 purchases worth $4.2M and 2 sales worth $206K.

Shares Outstanding

52.353M

Shares Float

43.643M

Insider Shares Owned

423.900K

Insider % Owned

0.8%

Institutional Shares Held

21.644M

Institutional % Held

42.2%

Ownership Breakdown

Net Insider Activity by Month

Purchases (90d)

$4.2M total

Sales (90d)

$206K total

Net Activity

Net Buying

Net Value (90d)

$4.0M

Prothena Corp Insider Transactions (Last 6 Months)

See all insider trades →

Date	Insider	Title	Type	Shares	Price	Value
Sep 29, 2026	William P Scully	10% OWNER	BUY	162.000K	$8.68	$1.4M
Sep 28, 2026	William P Scully	10% OWNER	BUY	103.500K	$8.60	$890K
Sep 18, 2026	William P Scully	10% OWNER	BUY	100.000K	$8.43	$843K
Sep 2, 2026	William P Scully	10% OWNER	BUY	27.000K	$9.47	$256K
Aug 20, 2026	William P Scully	10% OWNER	BUY	50.000K	$8.79	$439K
Aug 7, 2026	William P Scully	10% OWNER	BUY	37.500K	$8.62	$323K
Jul 28, 2026	Anne E. Kingston	CHIEF STRATEGY OFFICER	SELL	11.160K	$8.50	$95K
Jul 28, 2026	Michael J. Isaacs	GENERAL COUNSEL & COMPANY SEC.	SELL	13.080K	$8.50	$111K
Jun 16, 2026	William P Scully	10% OWNER	BUY	20.000K	$7.90	$158K
Jun 11, 2026	William P Scully	10% OWNER	BUY	125.000K	$8.17	$1.0M
Jun 4, 2026	William P Scully	10% OWNER	BUY	50.000K	$9.31	$465K
Jun 2, 2026	William P Scully	10% OWNER	BUY	50.000K	$9.43	$471K
May 22, 2026	William P Scully	10% OWNER	BUY	100.000K	$9.81	$981K

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Prothena Corp Ownership & Insider Activity

Prothena Corp Insider Transactions (Last 6 Months)

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