Statement of Changes in Beneficial Ownership (4)

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 ^* MOY JEFFREY	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 Operations
(Last) (First) (Middle) 6340 SEQUENCE DRIVE	3. Date of Earliest Transaction (MM/DD/YYYY) 2/18/2020
(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)
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	9/11/2019		J	V	4461 ⁽¹⁾	D	$0.0	30408 ⁽²⁾	D
Common Stock	9/11/2019		J	V	4461 ⁽¹⁾	A	$0.0	31819	I	by Trust ⁽³⁾
Common Stock	2/18/2020		S		610 ⁽⁴⁾	D	$283.369 ⁽⁵⁾	31209	I	by Trust ⁽³⁾
Common Stock	2/18/2020		S		1694 ⁽⁴⁾	D	$284.2265 ⁽⁶⁾	29515	I	by Trust ⁽³⁾
Common Stock	2/18/2020		S		800 ⁽⁴⁾	D	$286.545 ⁽⁷⁾	28715	I	by Trust ⁽³⁾
Common Stock	2/18/2020		S		400 ⁽⁴⁾	D	$287.4125 ⁽⁸⁾	28315	I	by Trust ⁽³⁾
Common Stock	2/18/2020		S		2795 ⁽⁴⁾	D	$288.9863 ⁽⁹⁾	25520	I	by Trust ⁽³⁾
Common Stock	2/18/2020		S		200 ⁽⁴⁾	D	$289.84	25320	I	by Trust ⁽³⁾
Common Stock	2/18/2020		S		100 ⁽⁴⁾	D	$290.98	25220	I	by Trust ⁽³⁾

*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)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)			11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:
(1)	Shares were transferred from direct ownership to ownership under the Moy Family Trust upon vesting of previously awarded restricted stock units.
(2)	Included in this number are 30,408 unvested restricted stock units, 11,714 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 15,047 of which were granted on March 8, 2018 and shall vest through March 8, 2021 and 3,647 of which were granted on March 8, 2017 and shall vest through March 8, 2020.
(3)	Shares are held by the Moy Family Trust U/A/D 12/09/2013, with respect to which the reporting person is a trustee.
(4)	On November 20, 2019, Mr. Moy adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Moy. The shares set forth above were sold pursuant to the 10b5-1 Plan.
(5)	This transaction was executed in multiple trades at prices ranging from $282.99 to $283.81. 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 $283.99 to $284.44. 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 $286.03 to $287.00. 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.
(8)	This transaction was executed in multiple trades at prices ranging from $287.39 to $287.42. 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 $288.71 to $289.70. 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
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
MOY JEFFREY 6340 SEQUENCE DRIVE SAN DIEGO, CA 92121			EVP Operations