UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE

SECURITIES EXCHANGE ACT OF 1934

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Tandem Diabetes Care, Inc.

(Name of Registrant as Specified In Its Charter)

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The Board of Directors recommends you vote for each to elect three class III directors for a term of either one or three years. Peyton R Howell, John F. Sheridan. The Board recommends you vote for proposals 2, 3 and 4: 2. To approve an amendment to the Company’s Amended and Restated Certificate of Incorporation to provide phased elimination of classified board structure. 3. To ratify the appointment of Ernst & Young LLP as our independent public accounting firm for the year ending December 31, 2022.

2021.

Rebecca Robertson, Dick Allen Myoungil Cha, Peyton Howell, Joao Malagueira, Kathleen McGroddy-Goetz, Rajwant Sodhi, Christopher J. Twomey, John F. Sheridan, The Board recommends you vote for proposals 1, 2, 3, 4 and 5: 2. To approve the Company’s 2013 Employee Stock Purchase Plan, as amended, to increase the number of shares under the plan. 3. To approve the Company’s 2023 Long-Term Incentive Plan, as amended, to increase the number of shares authorized for issuance under the plan. 4. To approve on a non-binding advisory basis the compensation of our named executive officers. 5. To ratify the appointment of Ernst & Young LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2024. independent