X0306 4 2020-02-24 0 0001093557 DEXCOM INC DXCM 0001359098 Pacelli Steven Robert 6340 SEQUENCE DRIVE SAN DIEGO CA 92121 0 1 0 0 EVP Strategy and Corporate Dev Common Stock 2020-02-24 4 S 0 370 275.7647 D 75785 D Common Stock 2020-02-24 4 S 0 540 277.406 D 75245 D Common Stock 2020-02-24 4 S 0 483 278.3194 D 74762 D Common Stock 2020-02-24 4 S 0 138 283.0633 D 74624 D On June 11, 2019, Mr. Pacelli adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Pacelli. The shares set forth above were sold pursuant to the 10b5-1 Plan. This transaction was executed in multiple trades at prices ranging from $275.585 to $275.97. 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 38,823 unvested restricted stock units, 14,987 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 19,251 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 4,585 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 $277.025 to $277.62. 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 $278.19 to $278.71. 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 issurer 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 $282.73 to $283.19. 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: Jereme Sylvain For: Steven R Pacelli 2020-02-26