DXCM DexCom Inc

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 * Leach Jacob Steven	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 Chief Technology Officer
(Last)          (First)          (Middle) 6340 SEQUENCE DRIVE	3. Date of Earliest Transaction (MM/DD/YYYY) 12/15/2021
(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	12/15/2021		A		2925 (1)	A	$0.001	72247 (2)	D
Common Stock								11824	I	Family Holdings (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)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:
(1)	Represents a grant of restricted stock units that are exempt from Section 16 b-3 and are subject to vesting over a 36 month period from the date of grant as follows: 1/2 shall vest 24 months from the Grant Date, 1/8 shall vest 27 months from the Grant Date, 1/8 shall vest 30 months from the grant date, 1/8 shall vest 33 months from the Grant Date, and the remaining balance shall vest 36 months from the Grant Date. Share units represent a contingent right to receive one share of DexCom Inc. Common Stock.
(2)	Included in this number are 20,426 unvested restricted stock units, 2,925 of which were granted on December 15, 2021 and shall vest through December 15, 2024, 7,171 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 7,832 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 2,498 of which were granted on March 8, 2019 and shall vest through March 8, 2022.
(3)	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.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Leach Jacob Steven 6340 SEQUENCE DRIVE SAN DIEGO, CA 92121			EVP Chief Technology Officer

Signatures
By: Jereme Sylvain For: Jacob S Leach		12/17/2021
**Signature of Reporting Person		Date