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)

4/9/2015
(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   4/9/2015     M    16423.0   A $20.65   265069   D    
Common Stock   4/9/2015     S    16423.0   (1) D $65.0244   (2) 248646   (3) D    
Common Stock   4/9/2015     M    3577.0   A $11.33   252223   D    
Common Stock   4/9/2015     S    3577.0   (1) D $65.0309   (4) 248646   (3) 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
Non-Qualified Stock Option (right to buy)   $11.33   4/9/2015     M         3577.0    8/8/2007   8/8/2016   Common Stock   3577   $65.0309   6419   D    
Non-Qualified Stock Option (right to buy)   $20.65   4/9/2015     M         16423.0    4/17/2007   4/17/2016   Common Stock   16423   $65.0244   39709   D    

Explanation of Responses:
( 1)  On December 11, 2014 Mr. Pacelli adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Pacelli. The shares set forth above were sold pursuant to the 10b5-1 Plan.
( 2)  This transaction was executed in multiple trades at prices ranging from $65.00 to $65.18. 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.
( 3)  Included in this number are 116,207 unvested restricted stock units, 45,000 of which were granted on March 8, 2015 and shall vest through March 8, 2018, 47,333 of which were granted on March 8, 2014 and shall vest through March 8, 2017, and 23,874 of which were granted on March 11, 2013 and shall vest through March 11, 2016.
( 4)  This transaction was executed in multiple trades at prices ranging from $65.00 to $65.18. 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.

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: Jess Roper For: Steven R. Pacelli 4/10/2015
** 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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