X0609 4 2026-08-15 0 0001438133 TANDEM DIABETES CARE INC TNDM 0001908267 Hansen Shannon Marie false 12400 HIGH BLUFF DRIVE SAN DIEGO CA 92130 0 1 0 0 EVP & Chief Legal Officer 0 Common Stock 2026-08-15 4 M 0 1097 0 A 31268 D Common Stock 2026-08-15 4 F 0 559 22.72 D 30709 D Common Stock 2026-08-15 4 M 0 1917 0 A 32626 D Common Stock 2026-08-15 4 F 0 976 22.72 D 31650 D Common Stock 1935 I Shannon M. Hansen Trust Restricted Stock Unit 2026-08-15 4 M 0 1097 0 D Common Stock 1097 3290 D Restricted Stock Unit 2026-08-15 4 M 0 1917 0 D Common Stock 1917 13418 D Shares withheld by the Issuer to satisfy tax withholding requirements upon the vesting of restricted stock units (RSUs). No shares were sold. The securities are held by the Shannon M. Hansen Trust dated July 8, 2003, of which Shannon M. Hansen is the Trustee. Awarded on May 23, 2024 pursuant to the Tandem Diabetes Care Inc. 2023 Long-Term Incentive Plan, as amended, and agreements related thereto (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. One-third of the RSUs granted on May 23, 2024 vested on May 15, 2025, with the remaining RSUs vesting in eight (8) equal quarterly installments thereafter, subject to the terms of the 2023 Plan. Awarded on May 30, 2025 pursuant to the 2023 Plan. One-third of the RSUs granted on May 30, 2025 vested on May 15, 2026, with the remaining RSUs vesting in eight (8) equal quarterly installments thereafter, subject to the terms of the 2023 Plan. /s/ Jerilyn Laskie, Attorney-in-Fact for Shannon M. Hansen 2026-08-18