X0306 4 2020-03-11 0 0001093557 DEXCOM INC DXCM 0001700255 Leach Jacob Steven 6340 SEQUENCE DRIVE SAN DIEGO CA 92121 0 1 0 0 EVP Chief Technology Officer Common Stock 2020-03-11 4 S 0 192 245.6705 D 134215 D Common Stock 2020-03-11 4 S 0 84 250.2028 D 134131 D Common Stock 2020-03-11 4 S 0 6633 265.426 D 127498 D Common Stock 2020-03-12 4 G 0 1000 0.0 D 126498 D Common Stock 11824 I Family Holdings Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the reporting person. This transaction was executed in multiple trades at prices ranging from $245.62 to $246.3456. 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 31,770 unvested restricted stock units, 11,748 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 9,991 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 10,031 of which were granted on March 8, 2018 and shall vest through March 8, 2021. This transaction represents a gift of securities made by the reporting person's spouse. This is not a market transaction, thus no price has been reported. 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. By: Jereme Sylvain For: Jacob S Leach 2020-03-13