Who's buying Prothena Corp. Public Ltd. Co.?

PRTA insider buying, 13F and 13D filings

• Oct 26, 2026Form 4 · 10% owner
  SCULLY WILLIAM P: Bought $2.1M on the open market in 2 filings
  2 purchases filed 2026-10-15 to 2026-10-26. Latest: 150.0K shares at ~$8.15, traded 2026-10-22 to 2026-10-23. Now holds 1.19M shares (stake up 14%).
  View the filing on SEC EDGAR ↗

Signals come from SEC filings: Form 4 (insiders, filed within 2 business days), 13F (fund holdings, up to 45 days after quarter end) and Schedule 13D (5%+ activist stakes). This page reports what the filings show; it is not investment advice.