DEXCOM INC — Director's Dealing 2016

May 17, 2016

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: DEXCOM INC (DXCM)
CIK: 0001093557
Period of Report: 2016-05-16

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2016-05-16	Common Stock	S	20000.0	$62.718	Disposed	237464	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	472991	Direct
Common Stock	11461	Indirect

Footnotes

F1: This transaction was executed in multiple trades at prices ranging from $62.58 to $62.92. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

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.