FORM 4
[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

Pacelli Steven Robert 		2. Issuer Name and Ticker or Trading Symbol

DEXCOM INC [ DXCM ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
EVP, Strategy & Corp. Dev.
(Last)          (First)          (Middle)

6340 SEQUENCE DRIVE 		3. Date of Earliest Transaction (MM/DD/YYYY)

11/10/2015
(Street)

SAN DIEGO, CA 92121
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
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 Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock   11/10/2015     M    14000.0   A $20.65   230214   D    
Common Stock   11/10/2015     S    14000.0   D $84.7291   216214   (1) D    
Common Stock   11/10/2015     M    7562.0   A $7.63   223776   D    
Common Stock   11/10/2015     S    7562.0   D $84.6965   216214   (1) D    
Common Stock   11/10/2015     M    3438.0   A $7.25   219652   D    
Common Stock   11/10/2015     S    3438.0   D $84.6965   216214   (1) D    

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Incentive Stock Option (right to buy)   $7.25   11/10/2015     M         3438.0    3/9/2008   3/9/2017   Common Stock   3438   $84.6965   0   D    
Incentive Stock Option (right to buy)   $7.63   11/10/2015     M         7562.0    5/19/2009   5/19/2018   Common Stock   7562   $84.6965   2855   D    
Non-Qualified Stock Option (right to buy)   $20.65   11/10/2015     M         14000.0    4/17/2007   4/17/2016   Common Stock   14000   $84.7291   0   D    

Explanation of Responses:
( 1)  Included in this number are 92,437 unvested restricted stock units, 45,000 of which were granted on March 8, 2015 and shall vest through March 8, 2018, 35,500 of which were granted on March 8, 2014 and shall vest through March 8, 2017, and 11,937 of which were granted on March 11, 2013 and shall vest through March 11, 2016.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
Pacelli Steven Robert
6340 SEQUENCE DRIVE
SAN DIEGO, CA 92121

EVP, Strategy & Corp. Dev.

Signatures
By: John Lister For: Steven R. Pacelli 11/12/2015
** 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 4(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 control number.
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