DEXCOM INC — Director's Dealing 2025

Jan 31, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: DEXCOM INC (DXCM)
CIK: 0001093557
Period of Report: 2025-01-28

Reporting Person: Leach Jacob Steven (EVP, Chief Operating Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-01-28	Common Stock	A	7107	—	Acquired	271278	Direct
2025-01-29	Common Stock	S	2634	$86.9142	Disposed	268644	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	47296	Indirect

Footnotes

F1: Represents performance stock units ("PSUs") granted to the reporting person on March 8, 2022 that vested on January 28, 2025.

F2: Included in this number are 51,972 unvested restricted stock units, 26,053 of which were granted on March 8, 2024 and shall vest through March 8, 2027, 16,931 of which were granted on March 8,
2023 and shall vest through March 8, 2026, and 8,988 of which were granted on March 8, 2022 and shall vest through March 8, 2025.

F3: Represents the number of shares required to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of PSUs. This sale is mandated by the Issuer's election
under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the reporting person.

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.