X0609 4 2026-08-22 0 0001093557 DEXCOM INC DXCM 0001700255 Leach Jacob Steven false 6340 SEQUENCE DRIVE SAN DIEGO CA 92121 1 1 0 0 President, CEO, and Director 0 Common Stock 2026-08-22 4 F 0 1451 92.34 D 418908 D Common Stock 47296 I Family Holdings 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 restricted stock units and does not represent a sale by the Reporting Person. Included in this number are 142,836 unvested restricted stock units, 104,516 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, and 8,684 of which were granted on March 8, 2024 and shall vest through March 8, 2027. Shares are held by the Gregg Family Grandchildren's Trust UAD 12/30/2010, with respect to which the Reporting Person's spouse is a trustee. /s/ Jereme M. Sylvain, as Attorney-in-Fact for Jacob Steven Leach 2026-08-25