DEXCOM INC — Director's Dealing 2017

May 26, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: DEXCOM INC (DXCM)
CIK: 0001093557
Period of Report: 2017-05-24

Reporting Person: GREGG TERRANCE H (Director, Executive Chairman)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-05-24	Common Stock	M	30000	$6.85	Acquired	484559	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-05-24	Incentive Stock Option (right to buy)	$6.85	M	30000	Disposed	2017-06-19	Common Stock (30000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	11461	Indirect
Common Stock	40882	Indirect

Footnotes

F1: Included in this number are 30,877 unvested restricted stock units which were granted on March 8, 2017 and shall vest on March 8, 2018.

F2: Shares are held by the Gregg Family Trust U/A/D 12/23/1998, with respect to which the reporting person is a trustee.