DEXCOM INC — Director's Dealing 2011

Mar 10, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: DEXCOM INC (DXCM)
CIK: 0001093557
Period of Report: 2011-03-08

Reporting Person: GREGG TERRANCE H (Director, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-03-08	Common Stock	A	182813	$0.001	Acquired	822076	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	30000	Direct
Common Stock	11461	Indirect

Footnotes

F1: Shares are restricted and subject to vesting over a 36 month period from the date of grant as follows: 1/36th shall vest each month beginning one month following the date of grant. Share units represent a contingent right to receive one share of DexCom, Inc. common stock.

F2: Included in this number are 92,213 shares restricted and subject to repurchase by DexCom, provided that DexCom's right to repurchase lapses with respect to 1/30th of the shares each month beginning one month following the grant date of January 2, 2008.
Also included in this number are 146,250 restricted stock units subject to vesting with respect to 1/36 of the units each month beginning one month following the grant date of March 12, 2010.

F3: Shares are held by the Gregg Family Trust U/A/D 12/23/1998, with respect to which the reporting person is a trustee.