Termination of Material Definitive Agreement

On September 12, 2023, Harpoon Therapeutics, Inc. (the "Company") received a Notice of Termination (the "Notice") from AbbVie Biotechnology Ltd ("AbbVie") terminating the Development and Option Agreement, dated November 20, 2019, by and between the Company and AbbVie (the "Agreement") (Filing, 8-K, Harpoon Therapeutics, SEP 12, 2023, View Source [SID1234635137]). AbbVie stated in the Notice that it will not exercise the exclusive license option under the Agreement, which granted AbbVie an option to a worldwide, exclusive license to the Company’s HPN217 program, which targets B cell maturation antigen. In accordance with the Agreement and the Notice and by mutual agreement of the Company and AbbVie, the termination of the Agreement will be effective on October 13, 2023. The aforementioned HPN217 program has been and will remain exclusively owned by the Company, and the Company plans to complete the ongoing Phase 1 clinical trial with data to support the next phase of development.

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