DexCom EVP sells 1,700 shares under 10b5-1 plan

DexCom Inc. executive Michael Jon Brown, EVP and Chief Legal Compliance Officer, reported an open-market sale of 1,700 shares of common stock at $75.55 per share on June 15, 2026.

Rhea-AI Filing Summary

DexCom Inc. executive Michael Jon Brown, EVP and Chief Legal Compliance Officer, reported an open-market sale of 1,700 shares of common stock at $75.55 per share on June 15, 2026. After the sale, he directly holds 106,353 shares, including 74,753 unvested restricted stock units that vest over multiple dates through March 8, 2029. The transaction was executed under a pre-arranged Rule 10b5-1 trading plan adopted on November 26, 2025, indicating it was scheduled in advance as part of an orderly disposition program.

Insider Trade Summary 10b5-1

Net Seller: 1,700 shares

Net Sell 1 txn

Insider Brown Michael Jon

Role EVP Chief Legal Compliance Off

Sold 1,700 shs ($128K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,700	$75.55	$128K

Holdings After Transaction: Common Stock — 106,353 shares (Direct)

Footnotes (2)

1. F1. On November 26, 2025, Mr. Brown adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Brown. The shares set forth above were sold pursuant to the 10b5- 1 Plan.
2. F2. Included in this number are 74,753 unvested restricted stock units, 39,019 of which were granted on March 8, 2026 and shall vest through March 8, 2029, 19,948 of which were granted on March 8, 2025 and shall vest through March 8, 2028, 8,549 of which were granted on March 8, 2025 and shall vest through March 8, 2027, and 7,237 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

Key Figures

Shares sold: 1,700 shares Sale price: $75.55 per share Shares held after transaction: 106,353 shares +5 more

8 metrics

Shares sold 1,700 shares Open-market sale on June 15, 2026

Sale price $75.55 per share Price for common stock sold

Shares held after transaction 106,353 shares Direct holdings following sale

Unvested RSUs 74,753 units Included in post-transaction holdings

RSUs granted March 8, 2026 39,019 units Vest through March 8, 2029

RSUs granted March 8, 2025 (2028 vesting) 19,948 units Vest through March 8, 2028

RSUs granted March 8, 2025 (2027 vesting) 8,549 units Vest through March 8, 2027

RSUs granted March 8, 2024 7,237 units Vest through March 8, 2027

Key Terms

Rule 10b5-1 Plan, open-market sale, restricted stock units, unvested

4 terms

Rule 10b5-1 Plan financial

"This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Brown."

A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.

open-market sale financial

"transaction_action: open-market sale of common stock at $75.55 per share."

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

restricted stock units financial

"Included in this number are 74,753 unvested restricted stock units, granted on several dates."

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

unvested financial

"Included in this number are 74,753 unvested restricted stock units that will vest through 2029."

FAQ

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

What did DexCom (DXCM) executive Michael Jon Brown do in this Form 4?

Michael Jon Brown sold 1,700 shares of DexCom common stock in an open-market transaction. The sale was reported on Form 4 and reflects a pre-planned trade under an established Rule 10b5-1 plan adopted in November 2025.

At what price did Michael Jon Brown sell DexCom (DXCM) shares?

He sold 1,700 DexCom common shares at a price of $75.55 per share. This was an open-market sale executed as part of a Rule 10b5-1 trading plan, designed to allow orderly, pre-scheduled share dispositions over time.

How many DexCom (DXCM) shares does Michael Jon Brown hold after this sale?

After the transaction, Michael Jon Brown directly holds 106,353 DexCom common shares. This total includes both vested shares and 74,753 unvested restricted stock units scheduled to vest between March 2024 and March 2029, according to the filing footnote.

What is the Rule 10b5-1 plan mentioned in Michael Jon Brown’s DexCom (DXCM) filing?

The filing notes that Brown adopted a Rule 10b5-1 trading plan on November 26, 2025. Under this pre-arranged plan, specified amounts of his DexCom shares can be sold automatically over time, reducing the significance of the exact sale timing.

How many unvested DexCom (DXCM) restricted stock units does Michael Jon Brown have?

The Form 4 states that 74,753 of Brown’s reported holdings are unvested restricted stock units. These RSUs were granted on several dates and are scheduled to vest in tranches through March 8, 2029, subject to the company’s vesting terms.

Is Michael Jon Brown’s DexCom (DXCM) share sale a discretionary trade?

According to the footnote, the sale was made under a Rule 10b5-1 plan adopted on November 26, 2025. Such plans pre-schedule trades, so the transaction is characterized as part of an orderly disposition rather than a spontaneous discretionary decision.

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

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Accepted by SEC EDGAR 06/17/2026 - 04:32 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Brown Michael Jon

(Last) (First) (Middle)

6340 SEQUENCE DRIVE

(Street)

SAN DIEGO CALIFORNIA 92121

(City) (State) (Zip)

UNITED STATES

(Country)

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 Legal Compliance Off

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/15/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction 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	06/15/2026		S		1,700(1)	D	$75.55	106,353(2)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction 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 (Month/Day/Year)		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: 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. On November 26, 2025, Mr. Brown adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Brown. The shares set forth above were sold pursuant to the 10b5- 1 Plan.

2. Included in this number are 74,753 unvested restricted stock units, 39,019 of which were granted on March 8, 2026 and shall vest through March 8, 2029, 19,948 of which were granted on March 8, 2025 and shall vest through March 8, 2028, 8,549 of which were granted on March 8, 2025 and shall vest through March 8, 2027, and 7,237 of which were granted on March 8, 2024 and shall vest through March 8, 2027.

Remarks:

	/s/ Jereme M. Sylvain, as Attorney-in-Fact for Michael Jon Brown	06/17/2026
	** 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 4 (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.
* Form 4: SEC 1474 (03-26)