Tandem Diabetes shareholders approve charter amendments and equity plan increase at annual meeting

Proposal 3 : To approve the Amended Plan to, among other things, increase the number of shares authorized for issuance under the plan. This proposal was approved and the voting results were as follows: For Against Abstain Broker Non-Votes 53,846,696 1,108,529 30,069 2,979,081

Proposal 5 : To approve an amendment to the Company’s Amended and Restated Certificate of Incorporation to, among other things, (i) limit the liability of officers of the Company to the maximum extent permitted by law as permitted pursuant to Section 102(b)(7) of the DGCL, and (ii) implement certain other changes based on updates to the DGCL. This proposal was approved and the voting results were as follows: For Against Abstain Broker Non-Votes 45,926,405 9,043,831 15,058 2,979,081

Proposal 6 : To ratify the appointment of Ernst & Young LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2026. This proposal was approved and the voting results were as follows: For Against Abstain Broker Non-Votes 57,493,084 454,735 16,556 0

Proposal 1 : To elect nine directors for a one-year term expiring at the 2027 annual meeting of stockholders. The stockholders elected nine directors by the following votes: Name of Director For Against Abstain Broker Non-Votes Rebecca Robertson 54,160,282 799,310 25,702 2,979,081 Sandra Beaver 54,607,191 348,050 30,053 2,979,081 Myoungil Cha 54,456,358 502,290 26,646 2,979,081 Peyton Howell 54,179,597 773,220 32,477 2,979,081 Joao Malagueira 54,454,159 499,747 31,388 2,979,081 Kathleen McGroddy-Goetz 54,312,399 641,726 31,169 2,979,081 John Sheridan 54,432,569 536,164 16,561 2,979,081 2 Rajwant Sodhi 54,328,131 621,295 35,868 2,979,081 Christopher Twomey 47,921,655 7,034,208 29,431 2,979,081

Proposal 2 : To approve, on a non-binding, advisory basis, the compensation of the Company’s named executive officers as described in the Proxy Statement. This proposal was approved and the voting results were as follows: For Against Abstain Broker Non-Votes 53,460,747 1,481,027 43,520 2,979,081

Proposal 4 : To approve an amendment to the Company’s Amended and Restated Certificate of Incorporation to provide for removal of directors with or without cause, as required by Section 141(k) of the DGCL. This proposal was approved and the voting results were as follows: For Against Abstain Broker Non-Votes 57,818,029 126,025 20,321 0