Exhibit 99.1 Media Contact: Investor Contact: 858-366-6900 IR@tandemdiabetes.com FOR IMMEDIATE RELEASE Tandem Diabetes Care Announces Third Quarter 2025 Financial Results San Diego, November 6, 2025 - Tandem Diabetes Care, Inc. (Nasdaq: TNDM), a global insulin delivery and diabetes technology company, today reported its financial results for the quarter ended September 30, 2025 and reaffirmed full year 2025 guidance. Third Quarter 2025 and Recent Highlights "Tandem delivered a strong third quarter performan ...