DEXCOM INC — Director's Dealing 2013

May 13, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: DEXCOM INC (DXCM)
CIK: 0001093557
Period of Report: 2013-05-09

Reporting Person: DOUBLEDAY RICHARD (SVP, Worldwide Sales)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-05-09	Common Stock	S	692	$19.5536	Disposed	92553	Direct
2013-05-09	Common Stock	S	580	$19.5588	Disposed	91973	Direct

Footnotes

F1: Included in this number are 75,667 unvested restricted stock units, 50,000 of which were granted on March 11, 2013 and shall vest through March 11, 2016, 17,083 of which were granted on March 8, 2012 and shall vest through March 8, 2015, and 8,584 of which were granted on March 8, 2011 and shall vest through March 8, 2014.