DEXCOM INC — Director's Dealing 2013

Dec 13, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: DEXCOM INC (DXCM)
CIK: 0001093557
Period of Report: 2013-12-11

Reporting Person: GREGG TERRANCE H (Director, CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-12-11	Common Stock	M	10000.0	$7.31	Acquired	222813	Direct
2013-12-11	Common Stock	S	10000.0	$33.5	Disposed	212813	Direct
2013-12-12	Common Stock	M	35000.0	$3.19	Acquired	247813	Direct
2013-12-12	Common Stock	S	35000.0	$34.6504	Disposed	212813	Direct
2013-12-13	Common Stock	M	5000.0	$13.99	Acquired	217813	Direct
2013-12-13	Common Stock	S	5000.0	$34.5	Disposed	212813	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-12-12	Non-Qualified Stock Option (right to buy)	$3.19	M	35000.0	Disposed	2018-12-11	Common Stock (35000)	Direct
2013-12-11	Non-Qualified Stock Option (right to buy)	$7.31	M	10000.0	Disposed	2017-05-23	Common Stock (10000)	Direct
2013-12-13	Non-Qualified Stock Option (right to buy)	$13.99	M	5000.0	Disposed	2015-05-19	Common Stock (5000)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	11461	Indirect
Common Stock	732889	Indirect

Footnotes

F1: Included in this number are 137,110 unvested restricted stock units granted on March 11, 2013, 5,078 of which shall vest each month through March 11, 2016.

F2: This transaction was executed in multiple trades at prices ranging from $34.50 to $34.885. 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 issurer full information regarding the number of shares and prices at which the transactions were effected.

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.