BlackRock, Inc. Reports Decreased Ownership in Prothena Corporation

BlackRock, Inc. has filed a Schedule 13G/A amendment indicating a significant decrease in its ownership of Prothena Corporation Public Limited Company. As of September 30, 2025, BlackRock owns 3,092,261 shares, representing a 5.7% ownership stake, down from previous filings. The filing highlights that BlackRock's ownership is held through various business units and does not include securities owned by other disaggregated business units. The filing also certifies that the securities were acquired and are held in the ordinary course of business, not for the purpose of influencing control of the issuer. The amendment includes updated power of attorney and subsidiary identification details.