X0508 4 2026-02-17 0 0001438133 TANDEM DIABETES CARE INC TNDM 0001513889 Carpenter Rick 12400 HIGH BLUFF DRIVE SAN DIEGO CA 92130 0 1 0 0 Chief Technology Officer 0 Common Stock 2026-02-17 4 M 0 1437 0 A 25689 D Common Stock 2026-02-17 4 F 0 808 18.95 D 24881 D Common Stock 2026-02-17 4 M 0 897 0 A 25778 D Common Stock 2026-02-17 4 F 0 504 18.95 D 25274 D Restricted Stock Unit 2026-02-17 4 M 0 1437 0 D Common Stock 1437 1437 D Restricted Stock Unit 2026-02-17 4 M 0 897 0 D Common Stock 897 4487 D Shares withheld by Tandem Diabetes Care Inc. (the Company) to satisfy tax withholding requirements on vesting of restricted stock units (RSU). No shares were sold. Awarded on May 25, 2023 pursuant to the Tandem Diabetes Care, Inc. 2023 Long-Term Incentive Plan (the 2023 Plan). Each RSU represents a contingent right to receive either one share of common stock of the Issuer or cash in lieu thereof, at the Issuer's discretion, in accordance with the terms of the 2023 Plan. RSU vest as to thirty-three percent (33%) of the total number of shares subject to the RSU on 5/15/2024, and the remaining shares shall vest in eight (8) equal quarterly installments thereafter. Awarded on May 23, 2024 pursuant to the 2023 Plan. RSU vest as to thirty-three percent (33%) of the total number of shares subject to the RSU on 5/15/2025, and the remaining shares shall vest in eight (8) equal quarterly installments thereafter. /s/ Shannon M. Hansen, Attorney-in-Fact for Rick A. Carpenter 2026-02-19