Director William P. Scully filed a Form 4 with the U.S. Securities and Exchange Commission on October 29, 2026, reporting a gift acquisition of 566,444 ordinary shares of Prothena Corp Public Ltd Co (NASDAQ:PRTA) on October 27, 2026.

Key Highlights

  • Transaction type: Scully acquired 566,444 ordinary shares (par value $0.01 per share) via a gift transaction, coded "G," at a price of $0.
  • Direct ownership following transaction: Scully directly holds 1,753,444 ordinary shares following the reported acquisition.
  • Indirect holdings by spouse: An additional 529,000 ordinary shares are held indirectly by Scully's spouse.
  • Indirect holdings via Manatee Equity Fund LLC: A further 187,000 ordinary shares are held indirectly through Manatee Equity Fund LLC, with a disclaimer of beneficial ownership except to the extent of pecuniary interest.
  • Reporting person's role: Scully is identified as a Director of Prothena Corp Public Ltd Co.
  • Filing signed by proxy: The form was signed by Reid E. Buchanan by power of attorney from William P. Scully.

Director Scully's October 2026 Gift Acquisition and Beneficial Ownership at Prothena

According to the Form 4 filing, William P. Scully, a director of Prothena Corp Public Ltd Co, reported a transaction dated October 27, 2026, in which he acquired 566,444 ordinary shares, par value $0.01 per share, with a transaction code of "G," indicating a gift. The stated price for the acquisition was $0. No derivative securities were reported in connection with this transaction.

Following the reported transaction, the filing discloses that Scully directly owns 1,753,444 ordinary shares. In addition, the filing reports two categories of indirect beneficial ownership: 529,000 ordinary shares held by his spouse, and 187,000 ordinary shares held through Manatee Equity Fund LLC. With respect to the Manatee Equity Fund LLC shares, the filing states that "the reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein."

The Form 4 was filed on October 29, 2026, with October 27, 2026 identified as the date of earliest transaction. The form was executed by Reid E. Buchanan acting under a power of attorney from William P. Scully. No Table II derivative securities were reported in the filing.

What Was Disclosed

Director William P. Scully reported a gift acquisition of 566,444 ordinary shares of Prothena Corp Public Ltd Co at $0, bringing his direct beneficial ownership to 1,753,444 shares, with additional indirect holdings of 529,000 shares via spouse and 187,000 shares via Manatee Equity Fund LLC.