X0508 4 2026-02-12 0 0001093557 DEXCOM INC DXCM 0001485616 Heller Bridgette P 6340 SEQUENCE DRIVE SAN DIEGO CA 92121 1 0 0 0 1 Common Stock 2026-02-12 4 S 0 1012 68.01 D 26019 D On August 14, 2025, Ms. Heller adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Ms. Heller. The shares set forth above were sold pursuant to the 10b5-1 Plan. Included in this number are 5,046 unvested restricted stock units which were granted on May 8, 2025 and will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2026 Annual Meeting of Stockholders. /s/ Jereme M. Sylvain, as Attorney-in-Fact for Bridgette P. Heller 2026-02-17