Insiders who reported open-market trades in the last 12 months at the companies William P. Scully files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
Michael John Isaacs - $71K in PRTA purchases and sales in the last 12 months
Anne Evans Kingston - $65K in PRTA purchases and sales in the last 12 months
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William P. Scully is a corporate insider, tracked as 10% Owner of PROTHENA CORP PUBLIC LTD CO (PRTA). InsiderAlpha holds 17 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
How many SEC Form 4 filings has William P. Scully submitted recently?
10 primary Form 4 filings in the last 90 days, covering 1 company.
Has William P. Scully been buying or selling stock?
Recorded transactions: 21 open-market purchases ($12.68M) and 0 open-market sales across all tracked filings.
William P. Scully is 10% Owner of PROTHENA CORP PUBLIC LTD CO (PRTA). 17 SEC Form 4 filings on record going back to 2025, most recently on 9 October 2026. Most recent open-market trade: bought $771K of PRTA on 9 October 2026. Lifetime open-market purchases: $12.68M.
Recent transactions
20
The latest 20 SEC Form 4 transactions reported by William P. Scully.
InsiderAlpha's records for William P. Scully go back to 2025: 17 primary Form 4 filings, an average of 8.5 per year. The typical open-market purchase is $604K (21 buys totaling $12.68M). The largest single buy on record is $1.41M of PRTA in 2026. No recorded transaction carries a Rule 10b5-1 plan flag. An absent flag does not establish whether a transaction was pre-arranged or discretionary.
