X0609 4 2026-09-10 0 0001093557 DEXCOM INC DXCM 0001681267 Sylvain Jereme M false 6340 SEQUENCE DRIVE SAN DIEGO CA 92121 0 1 0 0 EVP, Chief Financal Officer 1 Common Stock 2026-09-10 4 S 0 3638 83.27 D 146828 D On June 10, 2026, Mr. Sylvain adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sylvain. The shares set forth above were sold pursuant to the 10b5-1 Plan. Included in this number are 87,094 unvested restricted stock units, 48,774 of which were granted on March 8, 2026 and shall vest through March 8, 2029, 23,937 of which were granted on March 8, 2025 and shall vest through March 8, 2028, 5,699 of which were granted on March 8, 2025 and shall vest through March 8, 2027, 8,684 of which were granted on March 8, 2024 and shall vest through March 8, 2027, and 76 additional shares acquired under the Issuer's Amended and Restated 2015 Employee Stock Purchase Plan. /s/ Jereme M. Sylvain 2026-09-14