X0202 4 2007-03-28 0 0001093557 DEXCOM INC DXCM 0001236386 SKYLER JAY S 5555 OBERLIN DRIVE SAN DIEGO CA 92121 1 0 0 0 Common Stock 2007-03-28 4 A 0 1089 7.25 A 96025 I by Trust Common Stock 9950 D Common Stock 10000 I by Daughter Common Stock 10000 I by Spouse The number of shares was calculated based on the closing price of DexCom's stock on the day of the board and committee meetings attended between February 12, 2007 and March 15, 2007. Shares are held by Jennifer Skyler Living Trust, with respect to which the Reporting Person is a trustee. The reporting person disclaims beneficial ownership of these securities and this report shall not be deemed an admission that the reporting person is the beneficial owner of the securities for purposes of Section 16 or for any other purpose. By: Jess Roper For: Jay S. Skyler 2007-03-30