PRTA insider trading

Prothena Corp Public Ltd Co

In the past 36 days, 1 insider bought $6.7M of Prothena Corp Public Ltd Co stock in 6 open-market purchases. The largest purchase was $1.8M by William P Scully (10% owner) on Oct 7, 2026.

Insider purchases

Insider	Value	Holdings	Signal	Traded / filed
William P Scully 10% owner	$920K 110,000 sh @ $8.36	+11.9%	Low Sizable purchase ($920K)	Oct 13, 2026 Filed Oct 15, 2026
William P Scully 10% owner	$1.8M 215,000 sh @ $8.47	+68.5%	Medium Large purchase ($1.8M) Raises holdings 68% Held indirectly (trust, fund or family)	Oct 7, 2026 Filed Oct 9, 2026
William P Scully 10% owner	$857K 100,000 sh @ $8.57	+46.7%	Low Sizable purchase ($857K) Raises holdings 47% Held indirectly (trust, fund or family)	Oct 2, 2026 Filed Oct 6, 2026
William P Scully 10% owner	$1.4M 162,000 sh @ $8.68	+311.5%	Medium Large purchase ($1.4M) More than doubles holdings (+312%) Held indirectly (trust, fund or family)	Sep 29, 2026 Filed Sep 30, 2026
William P Scully 10% owner	$890K 103,500 sh @ $8.60	+124.0%	Medium Sizable purchase ($890K) More than doubles holdings (+124%) Held indirectly (trust, fund or family)	Sep 28, 2026 Filed Sep 29, 2026
William P Scully 10% owner	$843K 100,000 sh @ $8.43	+12.1%	Low Sizable purchase ($843K)	Sep 18, 2026 Filed Sep 21, 2026

Insider sales

No open-market sales by insiders in this period.