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)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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Tandem Diabetes, Inc. Proxy Voting Instructions May 27, 2020, 1. To elect two Class I directors for a three-year term to expire at the 2023 annual meeting of stockholders. Kim D. Blickenstaff Christopher J. Twomey. 2. To ratify the appointment of Ernst & Young LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2020. 3. To approve, on a non-binding, advisory basis, the compensation of our named executive officers. 4. To transact such other business as may properly be brought before the Annual Meeting or at any adjournment or postponement thereof.