X0306 4 2020-02-10 0 0001093557 DEXCOM INC DXCM 0001286858 SAYER KEVIN R 6340 SEQUENCE DRIVE SAN DIEGO CA 92121 1 1 0 0 President, CEO and Chairman Common Stock 2020-02-10 4 S 0 1160 240.9749 D 195777 D Common Stock 2020-02-10 4 S 0 1901 242.357 D 193876 D Common Stock 2020-02-10 4 S 0 2865 242.9536 D 191011 D Common Stock 2020-02-10 4 S 0 74 243.97 D 190937 D On May 15, 2019, Mr. Sayer adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sayer. The shares set forth above were sold pursuant to the 10b5-1 Plan. This transaction was executed in multiple trades at prices ranging from $240.59 to $241.30. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected. Included in this number are 89,648 unvested restricted stock units, 35,829 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 40,272 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 13,547 of which were granted on March 8, 2017 and shall vest through March 8, 2020. This transaction was executed in multiple trades at prices ranging from $241.64 to $242.50. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected. This transaction was executed in multiple trades at prices ranging from $242.636 to $243.33. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected. By: Nicole Greene For: Kevin R Sayer 2020-02-11