DEXCOM INC — Director's Dealing 2013

May 17, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: DEXCOM INC (DXCM)
CIK: 0001093557
Period of Report: 2013-05-15

Reporting Person: MOY JEFFREY (SVP, Operations)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-05-15	Common Stock	M	5000	$3.19	Acquired	199248	Direct
2013-05-15	Common Stock	S	5000	$19.9745	Disposed	194248	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-05-15	Non-Qualified Stock Option (right to buy)	$3.19	M	5000	Disposed	2018-12-11	Common Stock (5000)	Direct

Footnotes

F1: Included in this number are 104,291 unvested restricted stock units, 50,000 of which were granted on March 11, 2013 and shall vest through March 11, 2016, 29,166 of which were granted on March 8, 2012 and shall vest through March 8, 2015, and 25,125 of which were granted on March 8, 2011 and shall vest through March 8, 2014.