[Form 3] DEXCOM INC Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

Dexcom, Inc. (DXCM) — Initial insider ownership filing. Director Euan Ashley filed a Form 3 reporting no securities beneficially owned as of 10/24/2025. The filing is made by one reporting person and marks the initial statement of holdings for this insider role. A Power of Attorney (Exhibit 24) authorized the signature by an attorney-in-fact.

SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Ashley Euan A.

(Last) (First) (Middle)

6340 SEQUENCE DRIVE

(Street)

SAN DIEGO CA 92121

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
10/24/2025

3. Issuer Name and Ticker or Trading Symbol
DEXCOM INC [ DXCM ]

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

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

5. If Amendment, Date of Original Filed (Month/Day/Year)

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)

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

Explanation of Responses:

Remarks:

Exhibit 24 - Power of Attorney

No securities are beneficially owned.

	/s/ Jereme M. Sylvain, as Attorney-in-Fact for Euan Ashley	10/28/2025
	** 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 5 (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 Number.

FAQ

What did Dexcom (DXCM) disclose in this Form 3?

A director, Euan Ashley, filed an initial statement reporting no securities beneficially owned as of 10/24/2025.

Who is the reporting person in the DXCM Form 3?

The reporting person is Euan Ashley, identified with the relationship of Director.

What is the date of the event for this Form 3?

The event date is 10/24/2025.

How many reporting persons are included?

It is filed by one reporting person.

Does the director own any Dexcom securities?

The filing states no securities are beneficially owned.

Was a Power of Attorney used for the signature?

Yes. The remarks reference Exhibit 24 - Power of Attorney, and the form is signed by an attorney-in-fact for Euan Ashley.