Dexcom (DXCM)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-08-14 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: 2026-08-14 | Code: S (Open market sale) Shares: -1,700 | Price: $91.93 Total Value: $156,281.00 Shares Owned After: 102,953 | 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 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, 7,237 of which were granted on March 8, 2024 and shall vest through March 8, 2027. --- 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 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, 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 Michael Jon Brown (2026-08-17)