InsiderCIK 1045463

William P. Scully: Insider Trades

Every open-market purchase and sale William P. Scully reported on Form 4 since Aug 13, 2026, with how the stock moved after each purchase.

PRTA PROTHENA CORP PUBLIC LTD CO · 10% owner

12Purchases

$8.65MBought

0Sales

$0Sold

Track record of purchases

Not enough time has passed, or price data is missing, to measure these purchases yet.

Change in the stock price from the price paid to the closest weekly price about 1, 3 and 6 months later, from SEC fails-to-deliver data. Dividends are not included, and purchases with a possible stock split in between are skipped. Past results do not predict future ones. How we measure this

All reported trades

Trades by William P. Scully
Filed	Traded	Ticker	Role	Type	Shares	Price ($)	Value	Holding	Filing
Oct 26	Oct 23	PRTA	10% owner	▲ BUY	50,000	8.07	$404K	+4.4%	Form 4 ↗
Oct 26	Oct 22	PRTA	10% owner	▲ BUY	100,000	8.19	$819K	+9.6%	Form 4 ↗
Oct 15	Oct 14	PRTA	10% owner	▲ BUY	10,000	8.46	$85K	+1.0%	Form 4 ↗
Oct 15	Oct 13	PRTA	10% owner	▲ BUY	100,000	8.35	$835K	+11%	Form 4 ↗
Oct 9	Oct 8	PRTA	10% owner (ind.)	▲ BUY	90,000	8.57	$771K	+21%	Form 4 ↗
Oct 9	Oct 7	PRTA	10% owner (ind.)	▲ BUY	125,000	8.40	$1.05M	+40%	Form 4 ↗
Oct 6	Oct 2	PRTA	10% owner (ind.)	▲ BUY	100,000	8.57	$857K	+47%	Form 4 ↗
Sep 30	Sep 29	PRTA	10% owner (ind.)	▲ BUY	162,000	8.68	$1.41M	+312%	Form 4 ↗
Sep 29	Sep 28	PRTA	10% owner (ind.)	▲ BUY	103,500	8.60	$890K	+124%	Form 4 ↗
Sep 21	Sep 18	PRTA	10% owner	▲ BUY	100,000	8.43	$843K	+12%	Form 4 ↗
Sep 3	Sep 2	PRTA	10% owner	▲ BUY	27,000	9.47	$256K	+3.4%	Form 4 ↗
Aug 21	Aug 20	PRTA	10% owner	▲ BUY	50,000	8.79	$439K	+6.7%	Form 4 ↗

Source: SEC Form 4 filings, retrieved Oct 28, 2026. How we read filings

Names come from the filings. Different people can share a name, so we group trades by the SEC's reporting-owner number (CIK) instead.