Dexcom (DXCM)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-09-14 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: DEXCOM INC (DXCM) CIK: 0001093557 --- Reporting Owner --- Name: AUGUSTINOS NICHOLAS CIK: 0001238485 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Common Stock Date: 2026-09-14 | Code: S (Open market sale) Shares: -1,550 | Price: $84.02 Total Value: $130,231.00 Shares Owned After: 35,832 | Ownership: I (Indirect) | Nature: by Trust Footnotes: [F1] On June 10, 2026, Mr. Augustinos adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Augustinos. The shares set forth above were sold pursuant to the 10b5-1 Plan. [F2] Shares are held by the Kirschner/Augustinos Revocable Trust, with respect to which the Reporting Person is a trustee. [Transaction #2] Security: Common Stock Date: 2026-09-15 | Code: S (Open market sale) Shares: -6,539 | Price: $84.04 Total Value: $549,537.56 Shares Owned After: 29,293 | Ownership: I (Indirect) | Nature: by Trust Footnotes: [F1] On June 10, 2026, Mr. Augustinos adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Augustinos. The shares set forth above were sold pursuant to the 10b5-1 Plan. [F2] Shares are held by the Kirschner/Augustinos Revocable Trust, with respect to which the Reporting Person is a trustee. --- Holdings --- [Holding #1] Security: Common Stock Ownership: D (Direct) Footnotes: [F3] Represents unvested restricted stock units which were granted on May 28, 2026 and will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders. --- Footnotes (Complete Index) --- F1: On June 10, 2026, Mr. Augustinos adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Augustinos. The shares set forth above were sold pursuant to the 10b5-1 Plan. F2: Shares are held by the Kirschner/Augustinos Revocable Trust, with respect to which the Reporting Person is a trustee. F3: Represents unvested restricted stock units which were granted on May 28, 2026 and will vest on the earlier of the one year anniversary of the grant date or the date of DexCom, Inc.'s 2027 Annual Meeting of Stockholders. --- Signature --- /s/ /s/ Jereme M. Sylvain, as Attorney-in-Fact for Nicholas Augustinos (2026-09-16)