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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1093557	Dexcom Inc	DXCM	Surgical & Medical Instruments & Apparatus (3841)	330857544

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1236388	H Terrance Gregg	6340 Sequence Drive San Diego CA 92121	Executive Chairman	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2015-05-04	20,000	$8.95	450,626	No	4	M	Direct
Common Stock	Disposition	2015-05-04	20,000	$68.06	430,626	No	4	S	Direct
Common Stock	Disposition	2015-04-30	14,250	$67.13	522,139	No	4	S	Indirect	by Trust

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct
No	4	S	Indirect	by Trust

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Non-Qualified Stock Option (right to buy)	Disposition	2015-05-04	20,000	$68.06	20,000	$8.95

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
20,000	2009-01-02	2018-01-02	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	11,461	Indirect	by IRA

Footnotes

This transaction was executed in multiple trades at prices ranging from $68.02 to $68.13. 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.
Included in this number are 207,658 unvested restricted stock units, 35,000 of which were granted on March 8, 2015 and will vest on March 8, 2016, 116,798 unvested restricted stock units granted on March 8, 2014, 5,078 of which shall vest each month through March 8, 2017, and 55,860 unvested restricted stock units granted on March 11, 2013, 5,078 of which shall vest each month through March 11, 2016.
The reporting person contributed Dexcom, Inc. Common Stock to an exchange fund, pursuant to an agreement dated March 5, 2015 to contribute shares of DexCom, Inc. Common Stock in exchange for shares of the exchange fund. The Dexcom, Inc. Common Stock was valued at $67.13 per share for the purposes of determining the number of shares of the exchange fund issuable to the reporting person with respect to the April 30, 2015 closing of the exchange fund.
Shares are held by the Gregg Family Trust U/A/D 12/23/1998, with respect to which the reporting person is a trustee.