BlackRock, Inc. Amends Schedule 13G/A for Prothena Corporation

BlackRock, Inc. has filed an amendment to its Schedule 13G/A for Prothena Corporation, reporting a 5.7% ownership of the company's common stock as of September 30, 2025. The filing indicates that BlackRock beneficially owns 3,092,261 shares, with sole voting power over 3,023,604 shares and sole dispositive power over all 3,092,261 shares. The filing also notes that various persons have the right to receive dividends or proceeds from the sale of the common stock, but no single person's interest exceeds 5% of the total outstanding shares. The amendment was signed by Spencer Fleming, Managing Director of BlackRock, Inc.