Nicholas Augustinos - 14 Sep 2026 Form 4 Insider Report for DEXCOM INC (DXCM)

Reporting relationship: Director
Issuer ticker: DXCM
Reported as of: 14 Sep 2026
Net transaction value: -$679,769
SEC form: 4
Accepted by SEC: 16 Sep 2026, 16:26:04 UTC
Prior SEC filing: 13 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ Jereme M. Sylvain, as Attorney-in-Fact for Nicholas Augustinos

Key filing fact

Nicholas Augustinos filed Form 4 for DEXCOM INC (DXCM) on 16 Sep 2026.

Key facts

This page summarizes Nicholas Augustinos's Form 4 filing for DEXCOM INC (DXCM).
2 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 16 Sep 2026, 16:26.

Change

Previous filing in this sequence was filed on 13 Aug 2026.
Current net transaction value: -$679,769.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001238485 Primary reporting owner

AUGUSTINOS NICHOLAS

Relationship: Director
Address: 6340 SEQUENCE DRIVE, SAN DIEGO
Signature: /s/ Jereme M. Sylvain, as Attorney-in-Fact for Nicholas Augustinos
Signature date: 16 Sep 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

DXCM transaction

Common Stock

Sale

Transaction value: $130,231
Shares: -1,550
Change %: -4.1%
Price: $84.02
Shares after: 35,832
Date: 14 Sep 2026
Ownership: by Trust
Footnotes: F1, F2

DXCM transaction

Common Stock

Sale

Transaction value: $549,538
Shares: -6,539
Change %: -18%
Price: $84.04
Shares after: 29,293
Date: 15 Sep 2026
Ownership: by Trust
Footnotes: F1, F2

DXCM holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 5,575
Date: 14 Sep 2026
Ownership: Direct
Footnotes: F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 3 footnotes

Footnote 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.

Footnote F2

Shares are held by the Kirschner/Augustinos Revocable Trust, with respect to which the Reporting Person is a trustee.

Footnote 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.