FORM 3
        
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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 *

Selvaraj Shelly Ramasamy
2. Date of Event Requiring Statement (MM/DD/YYYY)
3/6/2020 

3. Issuer Name and Ticker or Trading Symbol

DEXCOM INC [DXCM]
(Last)        (First)        (Middle)

6340 SEQUENCE DRIVE
4. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                          _____ 10% Owner
___X___ Officer (give title below)        _____ Other (specify below)
SVP Information Technology /
(Street)

SAN DIEGO, CA 92121      

(City)              (State)              (Zip)
5. 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 Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 25351 (1)D  

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(MM/DD/YYYY)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date ExercisableExpiration DateTitleAmount or Number of Shares

Explanation of Responses:
(1) Included in this number are 21,726 unvested restricted stock units, 8,269 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 8,852 of which were granted on March 8, 2018 and shall vest through March 8, 2021, 1605 of which were granted on March 8, 2017 and shall vest through March 8, 2020 and 3,000 of which of were granted on May 22, 2016 and shall vest through May 22, 2020.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director10% OwnerOfficerOther
Selvaraj Shelly Ramasamy
6340 SEQUENCE DRIVE
SAN DIEGO, CA 92121


SVP Information Technology

Signatures
By: Jereme Sylvain For: Shelly Selvaraj3/10/2020
**Signature of Reporting PersonDate

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