X0306 4 2020-03-08 0 0001093557 DEXCOM INC DXCM 0001681267 Sylvain Jereme M 6340 SEQUENCE DRIVE SAN DIEGO CA 92121 0 1 0 0 SVP, Finance & CAO Common Stock 2020-03-08 4 A 0 5483 0.001 A 14030 D Represents a grant of restricted stock units that are exempt from Section 16 b-3 and are subject to vesting in three equal annual installments from the date of grant. Share units represent a contingent right to receive one share of DexCom, Inc. Common Stock. Included in this number are 11,247 unvested restricted stock units, 5,483 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 3,216 of which were granted on March 8, 2019 and shall vest through March 8, 2022 and 2,548 of which were granted on November 8, 2018 and shall vest through November 8, 2021. Jereme M. Sylvain 2020-03-10