EX-10.3 — xenetic_ex1003.htm
Xenetic Biosciences, Inc.
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Form of Santersus Stockholder Lock-Up Agreement
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_________, 2026
Xenetic Biosciences, Inc.
945 Concord Street
Framingham, MA 01701
Ladies and Gentlemen:
The undersigned (the “Stockholder”) understands that Xenetic Biosciences, Inc., a Nevada corporation (the “Company”), has entered into a Share Exchange Agreement, dated as of September 14, 2026 (the “Share Exchange Agreement”), with Santersus AG, a Swiss corporation (Aktiengesellschaft) (“Santersus”), the persons listed on Schedule I thereto (the “Sellers”), and Santersus, as representative of the Sellers, pursuant to which among other things, and subject to the terms and conditions set forth therein, the Sellers will sell, transfer and convey to the Company, and the Company will purchase from Sellers, in exchange for shares of Company Common Stock (as defined below), all of the issued and outstanding capital stock of Santersus (the “Acquisition”). Capitalized terms used but not otherwise defined herein shall have the respective meanings ascribed to such te
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