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  4. [Form 4] DEXCOM INC Insider Trading Activity

Dexcom (DXCM) HR chief cashes out 2,565 company shares

Filing Impact
(Moderate)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

DEXCOM INC (DXCM) executive Sadie Stern, EVP Chief People & Culture Officer, reported selling 2,565 shares of Common Stock on August 27, 2026 at $88.37 per share in an open-market transaction. The sale was executed under a pre-established Rule 10b5-1 trading plan adopted on May 28, 2026. After this sale, Stern holds 126,043 shares directly, including 71,903 unvested restricted stock units that are scheduled to vest in tranches through March 8, 2029.

Positive

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Negative

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Insider Stern Sadie
Role EVP Chief People & Culture Off
Sold 2,565 shs ($227K)
Type Security Shares Price Value
Sale Common Stock F1, F2 2,565 $88.37 $227K
Holdings After Transaction: Common Stock — 126,043 shares (Direct)
Footnotes (2)
  1. F1. On May 28, 2026, Ms. Stern adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Ms. Stern. The shares set forth above were sold pursuant to the 10b5-1 Plan.
  2. F2. Included in this number are 71,903 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, 5,699 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.
Shares sold 2,565 shares of Common Stock Sale on August 27, 2026
Sale price per share $88.37 per share Open-market or private transaction on August 27, 2026
Shares held after transaction 126,043 shares Direct ownership following August 27, 2026 sale
Unvested restricted stock units 71,903 RSUs Included within 126,043 shares held following the transaction
RSUs granted March 8, 2026 39,019 RSUs Unvested, scheduled to vest through March 8, 2029
RSUs granted March 8, 2025 (2028 vesting) 19,948 RSUs Unvested, scheduled to vest through March 8, 2028
RSUs granted March 8, 2025 (2027 vesting) 5,699 RSUs Unvested, scheduled to vest through March 8, 2027
RSUs granted March 8, 2024 7,237 RSUs Unvested, scheduled to vest through March 8, 2027
Rule 10b5-1 Plan regulatory
"This 10b5-1 Plan allows the orderly disposition of shares"
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.
restricted stock units financial
"Included in this number are 71,903 unvested restricted stock units"
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.
vest financial
"shall vest through March 8, 2029"
A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.
open market or private transaction financial
"Sale in open market or private transaction"

FAQ

What insider transaction did DXCM executive Sadie Stern report?
Sadie Stern reported a sale of 2,565 shares of Dexcom common stock on August 27, 2026 at $88.37 per share in an open-market or private transaction. The transaction was reported as a disposition of directly owned shares.

Was the DXCM insider sale by Sadie Stern under a Rule 10b5-1 plan?
Yes. The filing states that on May 28, 2026 Sadie Stern adopted a Rule 10b5-1 Plan that allows orderly disposition of shares, and the August 27, 2026 sale of 2,565 shares was executed pursuant to that plan.

How many DXCM shares does Sadie Stern hold after the reported sale?
After the August 27, 2026 sale, Sadie Stern directly holds 126,043 shares of Dexcom common stock. This total includes 71,903 unvested restricted stock units that are scheduled to vest over time through March 8, 2029.

What unvested RSUs in DXCM stock does Sadie Stern report holding?
Sadie Stern reports holding 71,903 unvested restricted stock units, including 39,019 RSUs granted March 8, 2026 vesting through March 8, 2029; 19,948 RSUs granted March 8, 2025 vesting through March 8, 2028; 5,699 RSUs granted March 8, 2025 vesting through March 8, 2027; and 7,237 RSUs granted March 8, 2024 vesting through March 8, 2027.

What is Sadie Stern’s role at DXCM mentioned in the Form 4?
The reporting person, Sadie Stern, is identified as an officer of Dexcom Inc. with the title EVP Chief People & Culture Officer. The Form 4 reflects her transactions and holdings in Dexcom common stock in that capacity.

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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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*
Stern Sadie
(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)
Director10% Owner
XOfficer (give title below)Other (specify below)
EVP Chief People & Culture Off
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/27/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock08/27/2026S2,565(1)D$88.37126,043(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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. On May 28, 2026, Ms. Stern adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Ms. Stern. The shares set forth above were sold pursuant to the 10b5-1 Plan.
2. Included in this number are 71,903 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, 5,699 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 Sadie Stern08/28/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR