=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-03-08
10b5-1 Pre-arranged Plan: No
--- Issuer ---
Name: DEXCOM INC (DXCM)
CIK: 0001093557
--- Reporting Owner ---
Name: Stern Sadie
CIK: 0001797971
Role: Officer (EVP, Chief HR Officer)
--- Non-Derivative Transactions ---
[Transaction #1]
Security: Common Stock
Date: 2026-03-08 | Code: A (Grant or award)
Shares: +39,019 | Price: $0.00
Shares Owned After: 148,709 | Ownership: D (Direct)
Footnotes:
[F1] Represents a grant of restricted stock units (RSUs) that are exempt from Section 16b-3 and are subject to vesting in three equal annual installments from the date of grant. RSUs represent a contingent right to receive one share of DexCom, Inc. Common Stock.
[Transaction #2]
Security: Common Stock
Date: 2026-03-08 | Code: F (Payment of exercise/tax)
Shares: -17,199 | Price: $68.10
Total Value: $1,171,251.90
Shares Owned After: 131,510 | Ownership: D (Direct)
Footnotes:
[F2] Represents the number of shares required to be withheld by the Issuer to cover tax withholding and remittance obligations in connection with the net settlement of RSUs and does not represent a sale by the Reporting Person.
[F3] Included in this number are 77,603 unvested RSUs, 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, 11,399 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.
--- Footnotes (Complete Index) ---
F1: Represents a grant of restricted stock units (RSUs) that are exempt from Section 16b-3 and are subject to vesting in three equal annual installments from the date of grant. RSUs represent a contingent right to receive one share of DexCom, Inc. Common Stock.
F2: Represents the number of shares required to be withheld by the Issuer to cover tax withholding and remittance obligations in connection with the net settlement of RSUs and does not represent a sale by the Reporting Person.
F3: Included in this number are 77,603 unvested RSUs, 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, 11,399 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.
--- Signature ---
/s/ /s/ Jereme M. Sylvain, as Attorney-in-Fact for Sadie Stern (2026-03-10)
