Director William P. Scully filed a Form 4 with the SEC on November 10, 2026, disclosing two transactions in ordinary shares of Prothena Corp Public Ltd Co (NASDAQ:PRTA) dated November 6 and November 9, 2026.

Key Highlights

  • Gift disposition: Scully disposed of 916,444 ordinary shares on November 6, 2026, via a gift transaction (code G) at a price of $0.
  • Open-market purchase: Scully acquired 140,000 ordinary shares on November 9, 2026, at a weighted average price of $8.5297 per share.
  • Price range: The November 9 purchase was executed in multiple transactions at prices ranging from $8.2250 to $8.8000 per share, inclusive.
  • Direct ownership after transactions: Scully directly holds 977,000 ordinary shares following the reported transactions.
  • Indirect holdings: An additional 529,000 shares are held indirectly by spouse, and 187,000 shares are held indirectly through Manatee Equity Fund LLC.
  • Disclaimer of beneficial ownership: According to the filing, Scully disclaims beneficial ownership of the Manatee Equity Fund LLC shares except to the extent of his pecuniary interest therein.

Scully's November Transactions in Prothena Ordinary Shares

According to the Form 4 filed on November 10, 2026, William P. Scully, identified as a director of Prothena Corp Public Ltd Co (NASDAQ:PRTA), reported two transactions in the company's ordinary shares, par value $0.01 per share. On November 6, 2026, Scully disposed of 916,444 shares via a gift (transaction code G) at $0, reducing his directly held position before the subsequent purchase.

On November 9, 2026, Scully acquired 140,000 ordinary shares through an open-market purchase (transaction code P) at a weighted average price of $8.5297 per share. The filing notes that these shares were purchased in multiple transactions at prices ranging from $8.2250 to $8.8000, inclusive, and states that full information regarding the number of shares purchased at each separate price is available upon request to Prothena, any security holder, or SEC staff.

Following both reported transactions, the filing states that Scully directly owns 977,000 ordinary shares. He also holds 529,000 shares indirectly through his spouse and 187,000 shares indirectly through Manatee Equity Fund LLC, with a disclaimer of beneficial ownership for the latter except to the extent of his pecuniary interest. The Form 4 was signed by Reid E. Buchanan by power of attorney from William P. Scully on November 10, 2026.

What Was Disclosed

The filing disclosed a gift disposal of 916,444 shares and an open-market purchase of 140,000 shares by Prothena director William P. Scully during November 6-9, 2026, leaving him with direct beneficial ownership of 977,000 ordinary shares.