Material Agreement (Form 8-K)

Item 1.01. Entry into a Material Definitive Agreement.

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On September 15, 2025 (the "Effective Date") Amphastar Pharmaceuticals, Inc. (the "Company"), entered into a contract research agreement (the "Agreement") with Nanjing Hanxin Pharmaceutical Technology Co., Ltd. ("Hanxin"). Pursuant to the Agreement, Hanxin will develop Recombinant Peptide Research Cell Banks ("RCBs") for the Company and license the RCBs to the Company subject to a fully paid, exclusive, perpetual, transferable, sub-licensable license worldwide (the "Transaction"). The RCBs will be used by the Company to make Master Cell Banks for one of its product candidates, AMP-107. Hanxin is obligated to keep the Company informed of progress of development and research as set forth in the Scope of Work, which is incorporated as Appendix A to the Agreement (the "Scope of Work"). Per the terms of the Agreement, all title to the RCBs developed, prepared and produced by Hanxin in conducting research and development will belong to the Company. The Company will also own any confidential and proprietary information, technology regarding development and manufacturing of the RCBs, which include, but are not limited to, engineering, scientific and practical information and formula, research data, design, and procedures to develop and manufacture the RCBs, in use or developed by Hanxin. Each of the Company and Hanxin have made customary representations, warranties and covenants in the Agreement. The term of the Agreement is three years from the Effective Date.

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Payments under the agreement will be made in Chinese yuan. The total cost of the Agreement to the Company will not exceed approximately $2.8 million, with payments adjusted based on actually currency exchange rates. The Company will pay Hanxin approximately $0.3 million on the Effective Date. Any additional work or changes to the Scope of Work requested by the Company will be charged by Hanxin to the Company on a cost plus basis, plus any applicable taxes. Any additional cost must be provided to the Company for approval prior to the work being performed.

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As previously disclosed in the Definitive Proxy Statement for the Company's 2025 Annual Meeting of Stockholders, as filed with the Securities and Exchange Commission (the "SEC") on Schedule 14A on April 14, 2025, Dr. Jack Zhang, the Company's Chief Executive Officer, President, and Director; and Dr. Mary Luo, the Company's Chairman, Chief Operating Officer, and Director; and certain members of their family beneficially own a majority of the equity interest in Hanxin. Accordingly, the independent and disinterested members of the Audit Committee of the Board of Directors of the Company evaluated and approved entry into the Agreement following their review of applicable considerations.

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The foregoing is a brief description of the material terms of the Agreement, does not purport to be a complete description of the rights and obligations of the parties thereunder, and is qualified in its entirety by reference to the copy of the Agreement that will be filed as an exhibit to the Company's Quarterly Report on Form 10-Q to be filed with the SEC for the fiscal quarter ending September 30, 2025, and is incorporated herein by reference.

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