SEC FORM 3

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Leach Jacob Steven

(Last)

(First)

(Middle)

6340 SEQUENCE DRIVE

(Street)

SAN DIEGO

92121

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
03/09/2017

3. Issuer Name and Ticker or Trading Symbol
DEXCOM INC [ DXCM ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	SVP, Research & Development

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	105,933⁽¹⁾	D
Common Stock	12,000	I	Family Holdings⁽²⁾
Common Stock	50,100	I	by Spouse⁽³⁾

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Incentive Stock Option (right to buy)	⁽⁴⁾	12/11/2018	Common Stock	10,577	$3.19	D
Incentive Stock Option (right to buy)	⁽⁴⁾	10/02/2018	Common Stock	25,000	$5.92	D
Incentive Stock Option (right to buy)	⁽⁴⁾	11/20/2019	Common Stock	4,797	$7.27	D
Incentive Stock Option (right to buy)	⁽⁴⁾	05/19/2018	Common Stock	7,500	$7.63	D
Incentive Stock Option (right to buy)	⁽⁴⁾	02/18/2020	Common Stock	11,458	$9.78	D
Non-Qualified Stock Option (right to buy)	⁽⁴⁾	12/11/2018	Common Stock	1,923	$3.19	D
Non-Qualified Stock Option (right to buy)	⁽⁴⁾	11/20/2019	Common Stock	203	$7.27	D
Non-Qualified Stock Option (right to buy)	⁽⁴⁾	02/18/2020	Common Stock	8,542	$9.78	D

Explanation of Responses:

1. Included in this number are 57,800 unvested restricted stock units, 23,134 of which were granted on March 8, 2017 and shall vest through March 8, 2020, 21,333 of which were granted on March 8, 2016 shall vest through March 8, 2019 and 13,333 of which were granted on March 8, 2015 and shall vest through March 8, 2018.

2. Shares are held by the Gregg Family Grandchildren's Trust UAD 12/30/2010, with respect to which the reporting person's spouse is a trustee.

3. Shares are held by the Kyndra S. Leach Trust UAD 12/12/2012, with respect to which the reporting person's spouse is a trustee.

4. Shares subject to the option are fully vested and immediately exercisable.

Remarks:

CONFIRMING STATEMENT: This Statement confirms that the undersigned Jacob Leach, has authorized and designated Steve Pacelli, Kevin Sun, Patrick Murphy and Timothy O'Brien to execute and file on the undersigned's behalf all Forms 3, 4, and 5 (including any amendments thereto) that the undersigned may be required to file with the U.S. Securities and Exchange Commission as a result of the undersigned's ownership of or transactions in securities of DexCom, Inc. The authority of Steve Pacelli, Kevin Sun, Patrick Murphy and Timothy O'Brien under this Statement shall continue until the undersigned is no longer required to file Forms 3, 4, and 5 with regard to the undersigned's ownership of or transactions in securities of DexCom, Inc., unless earlier revoked in writing. The undersigned acknowledges that Steve Pacelli, Kevin Sun, Patrick Murphy and Timothy O'Brien are not assuming any of the undersigned's responsibilities to comply with Section 16 of the Securities Exchange Act of 1934. Date: March 14, 2017 /s/ JACOB LEACH Jacob Leach

	By: Timothy O'Brien For: Jacob Leach	03/15/2017
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.