William P. Scully Insider Trades

10% owner

10% owner at Prothena Corp Public LTD Co. 3 significant open-market trades reported on SEC Form 4 in the last 180 days.

On EDGAR, this filer has 23 Form 4 filings on record since 2014, the latest on Sep 3, 2026. Full history on sec.gov

$1.0M

Bought

Sold

3 / 0

Buys / Sells

Companies

PRTA10% owner
Prothena Corp Public LTD Co
3 buys, $1.0M · 3 graded alerts

Reported Trades

Open-market transactions only (code P and S), outside any 10b5-1 plan, dated by the day the filing reached EDGAR. Each row links to the filing.

Filed	Company	Trade	Value	Shares	Source
Sep 3, 2026	PRTA10% owner	buy	$256K	27,000	Form 4
Aug 21, 2026	PRTA10% owner	buy	$439K	50,000	Form 4
Aug 10, 2026	PRTA10% owner	buy	$323K	37,500	Form 4

How to Read This Page

These are the trades an insider chose to make with their own money, not grants, option exercises or tax withholding. A purchase is the stronger signal (why buys carry more information than sales), and an insider who buys is locked out of selling for six months by the short-swing rule. Several insiders buying at the same company in the same week is cluster buying, the pattern the research literature rates highest. The window here is 180 days; the full filing history lives on EDGAR.

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Every call scored in public, misses included.