X0508 4 2025-11-10 0 0001093557 DEXCOM INC DXCM 0001700619 Collins Richard Alexander 6340 SEQUENCE DRIVE SAN DIEGO CA 92121 1 0 0 0 1 Common Stock 2025-11-10 4 S 0 3948 55.17 D 37994 I by Trust Common Stock 5074 D On August 7, 2025, the Richard A. Collins Revocable Trust (the "Trust") adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by the Trust. The shares set forth above were sold pursuant to the 10b5-1 Plan. Shares are held by the Richard A. Collins Revocable Trust, with respect to which the reporting person is a trustee. Represents unvested restricted stock units which were granted on May 8, 2025 and shall 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. Exhibit 24 - Power of Attorney /s/ Jereme M. Sylvain, as Attorney-in-Fact for Richard Alexander Collins 2025-11-10