DEXCOM INC — Director's Dealing 2026

Feb 2, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: DEXCOM INC (DXCM)
CIK: 0001093557
Period of Report: 2026-01-29

Reporting Person: SAYER KEVIN R (Director, Executive Chair)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-01-29	Common Stock	A	71218	—	Acquired	443247	Direct
2026-01-29	Common Stock	F	34257	$73.36	Disposed	408990	Direct

Footnotes

F1: Represents shares issued to the Reporting Person upon vesting of performance-based restricted stock units (PSUs) granted to the Reporting Person on March 9, 2023, resulting from achievement of performance conditions under the PSUs.

F2: Represents the number of shares required to be withheld by the Issuer to cover tax withholding and remittance obligations in connection with the net settlement of PSUs and does not represent a sale by the Reporting Person.

F3: Included in this number are 138,091 unvested restricted stock units, 85,490 of which were granted on March 8, 2025 and shall vest through March 8, 2028, 34,461 of which were granted on March 8,
2024 and shall vest through March 8, 2027, and 18,140 of which were granted on March 9, 2023 and shall vest through March 8, 2026.