X0508 4 2026-01-29 0 0001093557 DEXCOM INC DXCM 0001286858 SAYER KEVIN R 6340 SEQUENCE DRIVE SAN DIEGO CA 92121 1 1 0 0 Executive Chair 0 Common Stock 2026-01-29 4 A 0 71218 0 A 443247 D Common Stock 2026-01-29 4 F 0 34257 73.36 D 408990 D Represents shares issued to the Reporting Person upon vesting of performance-based restricted stock units (PSUs) granted to the Reporting Person on March 9, 2023, resulting from achievement of performance conditions under the PSUs. Represents the number of shares required to be withheld by the Issuer to cover tax withholding and remittance obligations in connection with the net settlement of PSUs and does not represent a sale by the Reporting Person. Included in this number are 138,091 unvested restricted stock units, 85,490 of which were granted on March 8, 2025 and shall vest through March 8, 2028, 34,461 of which were granted on March 8, 2024 and shall vest through March 8, 2027, and 18,140 of which were granted on March 9, 2023 and shall vest through March 8, 2026. Exhibit 24 - Power of Attorney /s/ Jereme M. Sylvain, as Attorney-in-Fact for Kevin R. Sayer 2026-02-02