of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, and shall not be incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, and shall not be incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, and shall not be incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Other Events On March 1, 2026, the Company announced positive results from its Phase 1 clinical trial evaluating SEP-631, a potent and selective oral negative allosteric modulator (“NAM”) of Mas-related G protein-coupled receptor X2 (“MRGPRX2”), and outlined initial Phase 2 development strategy. Phase 1 Results SEP-631 was evaluated in a randomized, double-blind, placebo-controlled Phase 1 trial in healthy volunteers, including single-ascending dose, multiple-ascending dose and food-effect co…

of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, and shall not be incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Director and Chair of the R&D Committee — Keith Gottesdiener, M.D.: Dr. Keith Gottesdiener was appointed as a new director and chair of the R&D Committee.

of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, and shall not be incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

President and COO — Liz Bhatt, M.S., M.B.A.: Liz Bhatt was promoted to President while retaining her role as Chief Operating Officer.

Other Events. On July 1, 2025, the previously announced Collaboration and License Agreement, dated as of May 13, 2025 (the “Collaboration Agreement”), by and between Septerna, Inc. (the “Company”) and Novo Nordisk A/S, became effective following the early termination of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended. A summary of the terms of the Collaboration Agreement is set forth in the Company’s Current Report on Form 8-K filed with the Secur…

of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, and shall not be incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Regulation FD Disclosure. On May 14, 2025, the Company issued a press release entitled “Septerna and Novo Nordisk to collaborate on oral small molecule medicines for obesity and other cardiometabolic diseases.” A copy of the press release is furnished as Exhibit 99.1 to this Current Report on the Form 8-K. In a separate business update, the Company now anticipates initiating a Phase 1 clinical trial to assess safety, tolerability, pharmacokinetics and pharmacodynamics (through an icatibant sk…

Entry into a Material Definitive Agreement. On May 13, 2025, Septerna, Inc. (the “Company”) and Novo Nordisk A/S (“Novo”) entered into a global Collaboration and License Agreement (the “Collaboration Agreement”). Under the Collaboration Agreement, the Company and Novo will exclusively collaborate to leverage the Company’s proprietary Native Complex Platform ™ to discover, develop and commercialize multiple potential oral small molecule therapies for metabolic-related disease s based on certai…

of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, and shall not be incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.

Chief Financial Officer — Gil M. Labrucherie: Appointment of a new Chief Financial Officer with significant industry experience.

of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, and shall not be incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such filing.