Exhibit 99.1 Media Contact: 858-366-6900 media@tandemdiabetes.com Investor Contact: 858-366-6900 IR@tandemdiabetes.com FOR IMMEDIATE RELEASE Tandem Diabetes Care Announces First Quarter 2024 Financial Results and Updates Full Year 2024 Financial Guidance San Diego, May 2, 2024 - Tandem Diabetes Care, Inc. (NASDAQ: TNDM), a global insulin delivery and diabetes technology company, today reported its financial results for the quarter ended March 31, 2024 and increased sales guidance for the year ending Decembe ...