X0609 4 2026-05-20 0 0001438133 TANDEM DIABETES CARE INC TNDM 0001238935 TWOMEY CHRISTOPHER J false 12400 HIGH BLUFF DRIVE SAN DIEGO CA 92130 1 0 0 0 0 Common Stock 2026-05-21 4 M 0 8759 0 A 24434 D Common Stock 5112 I See Footnote Common Stock 7568 I See Footnotes Restricted Stock Unit 2026-05-20 4 A 0 10220 0 A Common Stock 10220 10220 D Restricted Stock Unit 2026-05-21 4 M 0 8759 0 D Common Stock 8759 0 D The securities are held by the Chris J. Twomey and Rebecca J. Twomey Family Trust UTD September 20, 2002. The securities are directly owned by Twomey Family Investments, LLC. The Reporting Person is co-manager of Twomey Family Investments, LLC and shares voting and investment power over these securities held by Twomey Family Investments, LLC and may be deemed to have indirect beneficial ownership of such shares. The Reporting Person disclaims beneficial ownership of such securities held by Twomey Family Investments, LLC, except to the extent of his proportionate pecuniary interest therein. Each restricted stock units (RSU) represents a contingent right to receive either one share of the Issuers common stock or cash in lieu thereof, at the Issuers discretion, in accordance with the terms of the Tandem Diabetes Care, Inc. 2023 Long-Term Incentive Plan, as amended, and agreements related thereto (the 2023 Plan). RSU will vest on the one-year anniversary of the grant date, subject to the terms of the 2023 Plan. On May 21, 2025, the Reporting Person was granted 8,759 RSUs, all of which vested and converted into shares of the Issuers common stock on the one-year anniversary thereof in accordance with the 2023 Plan. Ex. 24: Power of Attorney /s/ Jerilyn Laskie, Attorney-in-Fact for Christopher J. Twomey 2026-05-22