=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-01-29
10b5-1 Pre-arranged Plan: No
--- Issuer ---
Name: DEXCOM INC (DXCM)
CIK: 0001093557
--- Reporting Owner ---
Name: Brown Michael Jon
CIK: 0001899922
Role: Officer (EVP, Chief Legal Officer)
--- Non-Derivative Transactions ---
[Transaction #1]
Security: Common Stock
Date: 2026-01-29 | Code: A (Grant or award)
Shares: +7,123 | Price: $0.00
Shares Owned After: 101,308 | Ownership: D (Direct)
Footnotes:
[F1] Represents shares issued to the Reporting Person upon vesting of performance-based restricted stock units (PSUs) granted to the Reporting Person on March 8, 2023, resulting from achievement of performance conditions under the PSUs.
[Transaction #2]
Security: Common Stock
Date: 2026-01-29 | Code: F (Payment of exercise/tax)
Shares: -2,653 | Price: $73.36
Total Value: $194,624.08
Shares Owned After: 98,655 | 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 PSUs and does not represent a sale by the Reporting Person.
[F3] Included in this number are 86,490 unvested restricted stock units, 29,922 of which were granted on March 8, 2025 and shall vest through March 8, 2028, 22,798 of which were granted on March 8,
2025 and shall vest through March 8, 2027, 14,474 of which were granted on March 8, 2024 and shall vest through March 8, 2027, 7,256 of which were granted on March 8, 2023 and shall vest through
March 8, 2026, 12,040 of which were granted on March 8, 2022 and shall vest through March 8, 2026, and 83 additional shares acquired under the Issuer's Amended and Restated 2015 Employee Stock Purchase Plan.
--- Footnotes (Complete Index) ---
F1: Represents shares issued to the Reporting Person upon vesting of performance-based restricted stock units (PSUs) granted to the Reporting Person on March 8, 2023, resulting from achievement of performance conditions under the PSUs.
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 PSUs and does not represent a sale by the Reporting Person.
F3: Included in this number are 86,490 unvested restricted stock units, 29,922 of which were granted on March 8, 2025 and shall vest through March 8, 2028, 22,798 of which were granted on March 8,
2025 and shall vest through March 8, 2027, 14,474 of which were granted on March 8, 2024 and shall vest through March 8, 2027, 7,256 of which were granted on March 8, 2023 and shall vest through
March 8, 2026, 12,040 of which were granted on March 8, 2022 and shall vest through March 8, 2026, and 83 additional shares acquired under the Issuer's Amended and Restated 2015 Employee Stock Purchase Plan.
--- Signature ---
/s/ /s/ Jereme M. Sylvain, as Attorney-in-Fact for Michael Jon Brown (2026-02-02)
