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 *

SAYER KEVIN R
2. Issuer Name and Ticker or Trading Symbol

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

__X__ Director                    _____ 10% Owner
__X__ Officer (give title below)    _____ Other (specify below)
President, CEO and Chairman
(Last)          (First)          (Middle)

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

6/1/2020
(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 6/1/2020  S  250 (1)D$372.466 (2)164292 (3)D  
Common Stock 6/1/2020  S  400 (1)D$373.8663 (4)163892 (3)D  
Common Stock 6/1/2020  S  1418 (1)D$374.9072 (5)162474 (3)D  
Common Stock 6/1/2020  S  1400 (1)D$375.9318 (6)161074 (3)D  
Common Stock 6/1/2020  S  1058 (1)D$376.9257 (7)160016 (3)D  
Common Stock 6/1/2020  S  400 (1)D$378.0725 (8)159616 (3)D  
Common Stock 6/1/2020  S  374 (1)D$379.492 (9)159242 (3)D  
Common Stock 6/1/2020  S  500 (1)D$381.0145 (10)158742 (3)D  
Common Stock 6/1/2020  S  200 (1)D$381.8 (11)158542 (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 Security3. Trans. Date3A. Deemed Execution Date, if any4. 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 Date7. 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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares

Explanation of Responses:
(1) On May 15, 2019, Mr. Sayer adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sayer. 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 $372.04 to $372.58. 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 76,187 unvested restricted stock units, 25,453 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 23,886 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 26,848 of which were granted on March 8, 2018 and shall vest through March 8, 2021.
(4) This transaction was executed in multiple trades at prices ranging from $373.31 to $374.02. 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.
(5) This transaction was executed in multiple trades at prices ranging from $374.515 to $375.37. 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.
(6) This transaction was executed in multiple trades at prices ranging from $375.53 to $376.50. 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.
(7) This transaction was executed in multiple trades at prices ranging from $376.55 to $377.33. 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.
(8) This transaction was executed in multiple trades at prices ranging from $377.945 to $378.23. 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.
(9) This transaction was executed in multiple trades at prices ranging from $379.15 to $380.00. 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.
(10) This transaction was executed in multiple trades at prices ranging from $380.44 to $381.20. 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.
(11) This transaction was executed in multiple trades at prices ranging from $381.61 to $381.99. 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
Director10% OwnerOfficerOther
SAYER KEVIN R
6340 SEQUENCE DRIVE
SAN DIEGO, CA 92121
X
President, CEO and Chairman

Signatures
By: Jereme Sylvain For: Kevin R Sayer6/2/2020
**Signature of Reporting PersonDate

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