BlackRock, Inc. Increases Stake in Amphastar Pharmaceuticals, Inc.

BlackRock, Inc. has filed a Schedule 13G/A amendment with the SEC, disclosing an increased ownership in Amphastar Pharmaceuticals, Inc. As of September 30, 2025, BlackRock beneficially owns 5,333,463 shares of Amphastar's common stock, representing 11.5% of the total outstanding shares. This marks a significant increase from previous filings, with a value change of $5,640,952,437.12 and a shares change of 4,858,032. The filing indicates that BlackRock acquired these shares in the ordinary course of business and not with the intent to influence control of the issuer. The filing also includes certifications and exhibits, such as a Power of Attorney and details on subsidiary identification.