Dexcom officer plans sale of 1,700 shares

Rhea-AI Filing Summary

DEXCOM, INC. (DXCM) officer Michael Brown filed a notice under Rule 144 to sell up to 1,700 shares of common stock through Morgan Stanley Smith Barney, reflecting an aggregate market value of $142,868.00. Dexcom reports 377,360,765 common shares outstanding, a baseline figure separate from this planned sale.

Key Figures

Shares to be sold under Rule 144: 1,700 shares Aggregate market value of shares to be sold: $142,868.00 Shares of common stock outstanding: 377,360,765 shares +3 more

6 metrics

Shares to be sold under Rule 144 1,700 shares Planned sale of Dexcom common stock by officer Michael Brown

Aggregate market value of shares to be sold $142,868.00 Value associated with the 1,700 shares covered by the notice

Shares of common stock outstanding 377,360,765 shares Dexcom common stock outstanding as referenced in the notice

Prior sale on August 14, 2026 1,700 shares for $156,281.00 Dexcom common stock sold by Michael Brown in the past three months

Prior sale on July 15, 2026 1,700 shares for $126,514.00 Dexcom common stock sold by Michael Brown in the past three months

Acquisition date of shares to be sold March 8, 2026 Date the 1,700 shares were acquired as Restricted Stock from issuer

Key Terms

Rule 144, Restricted Stock, aggregate market value, NASDAQ

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock financial

"Common | 03/08/2026 | Restricted Stock | ISSUER"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

aggregate market value financial

"Common | Morgan Stanley Smith Barney LLC... | 1700 | 142868.00"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

NASDAQ market

"377360765 | 09/15/2026 | NASDAQ"

The Nasdaq is a stock exchange where many companies' shares are bought and sold, functioning much like a marketplace for investments. It matters to investors because it provides a platform to buy and sell ownership stakes in companies, helping them track the value of those companies and make informed decisions. As one of the largest and most technology-focused markets, it also reflects trends and developments in the business world.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filing by DXCM insider Michael Brown disclose?

It discloses that officer Michael Brown intends to sell up to 1,700 shares of Dexcom common stock under Rule 144, with an indicated aggregate market value of $142,868.00, using Morgan Stanley Smith Barney as the broker.

How many Dexcom (DXCM) shares are involved in the planned Rule 144 sale?

The planned Rule 144 sale covers 1,700 shares of Dexcom common stock. These shares are to be sold through Morgan Stanley Smith Barney LLC Executive Financial Services, with an indicated aggregate market value of $142,868.00 on the form.

How many Dexcom (DXCM) shares are outstanding according to this Form 144?

Dexcom reports 377,360,765 shares of common stock outstanding in connection with this notice. This figure serves as a baseline ownership context and is separate from the 1,700 shares covered by Michael Brown’s planned Rule 144 sale.

What is the acquisition history of the DXCM shares Michael Brown plans to sell?

The 1,700 shares to be sold were acquired on March 8, 2026 as Restricted Stock from the issuer. The form classifies the security as Dexcom common stock and identifies the nature of acquisition as an issuer grant of restricted stock.

What DXCM stock sales has Michael Brown made in the past three months?

The form lists two prior sales of Dexcom common stock: 1,700 shares on August 14, 2026 for $156,281.00 and 1,700 shares on July 15, 2026 for $126,514.00, both attributed to Michael Brown.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/15/2026 - 04:02 PM Accepted by SEC EDGAR 09/15/2026 - 04:01 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001899922
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	DEXCOM, INC.
SEC File Number	000-51222
Address of Issuer	6340 Sequence Drive San Diego CALIFORNIA 92121
Phone	(858) 200-0200
Name of Person for Whose Account the Securities are To Be Sold	MICHAEL BROWN
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	1700	142868.00	377360765	09/15/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	03/08/2026	Restricted Stock	ISSUER			1700	03/08/2026	Not Applicable

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
MICHAEL BROWN 6340 Sequence Drive San Diego CA 92121	Common	08/14/2026	1700	156281.00
MICHAEL BROWN 6340 Sequence Drive San Diego CA 92121	Common	07/15/2026	1700	126514.00

144: Remarks and Signature

Remarks
Date of Notice	09/15/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	11/26/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Michael Jon Brown
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)