=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-09-15
10b5-1 Pre-arranged Plan: Yes
--- Issuer ---
Name: DEXCOM INC (DXCM)
CIK: 0001093557
--- Reporting Owner ---
Name: Brown Michael Jon
CIK: 0001899922
Role: Officer (EVP Chief Legal Compliance Off)
--- Non-Derivative Transactions ---
[Transaction #1]
Security: Common Stock
Date: 2026-09-15 | Code: S (Open market sale)
Shares: -1,700 | Price: $84.04
Total Value: $142,868.00
Shares Owned After: 99,885 | Ownership: D (Direct)
Footnotes:
[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.
[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, 7,237 of which were granted on March 8, 2024 and shall vest through
March 8, 2027, and 83 additional shares acquired under the Issuer's Amended and Restated 2015 Employee Stock Purchase Plan.
--- Footnotes (Complete Index) ---
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.
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, 7,237 of which were granted on March 8, 2024 and shall vest through
March 8, 2027, 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 (2026-09-16)
