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: Leach Jacob Steven (Director, President, CEO, and Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-01-29	Common Stock	A	8310	—	Acquired	340109	Direct
2026-01-29	Common Stock	F	3058	$73.36	Disposed	337051	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	47296	Indirect

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 8, 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 84,537 unvested restricted stock units, 35,906 of which were granted on March 8, 2025 and shall vest through March 8, 2028, 22,798 of which were granted on March 8,
2025 and shall vest through March 8, 2027, 17,368 of which were granted on March 8, 2024 and shall vest through March 8, 2027, 8,465 of which were granted on March 8, 2023 and shall vest through
March 8, 2026, and 102 additional shares acquired under the Issuer's Amended and Restated 2015 Employee Stock Purchase Plan.

F4: Shares are held by the Gregg Family Grandchildren's Trust UAD 12/30/2010, with respect to which the Reporting Person's spouse is a trustee.