Dexcom (DXCM)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-09-28 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: DEXCOM INC (DXCM) CIK: 0001093557 --- Reporting Owner --- Name: Stern Sadie CIK: 0001797971 Role: Officer (EVP Chief People & Culture Off) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-09-28 | Code: S (Open market sale) Shares: -2,565 | Price: $86.15 Total Value: $220,974.75 Shares Owned After: 123,478 | Ownership: D (Direct) Footnotes: [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. [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. --- Footnotes (Complete Index) --- 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. 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. --- Signature --- /s/ /s/ Jereme M. Sylvain, as Attorney-in-Fact for Sadie Stern (2026-09-30)