DEXCOM INC — Director's Dealing 2021

May 5, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: DEXCOM INC (DXCM)
CIK: 0001093557
Period of Report: 2021-05-03

Reporting Person: SAYER KEVIN R (Director, Chairman, CEO & President)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-03	Common Stock	S	2543	$376.3328	Disposed	108714	Direct
2021-05-03	Common Stock	S	487	$376.9818	Disposed	108227	Direct
2021-05-03	Common Stock	S	248	$377.971	Disposed	107979	Direct
2021-05-03	Common Stock	S	126	$378.99	Disposed	107853	Direct
2021-05-03	Common Stock	S	500	$382.48	Disposed	107353	Direct
2021-05-03	Common Stock	S	300	$384.91	Disposed	107053	Direct
2021-05-03	Common Stock	S	1331	$386.04	Disposed	105722	Direct

Footnotes

F1: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on July 31, 2020, and amended effective December 16, 2020. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sayer.

F2: This transaction was executed in multiple trades at prices ranging from $375.80 to $376.74. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

F3: Included in this number are 42,356 unvested restricted stock units, 13,445 of which were granted on March 8, 2021 and shall vest through March 8, 2024, 16,968 of which were granted on March 8, 2020 and shall vest through March 8, 2023, and 11,943 of which were granted on March 8, 2019 and shall vest through March 8, 2022.

F4: This transaction was executed in multiple trades at prices ranging from $376.850 to $377.374. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.

F5: This transaction was executed in multiple trades at prices ranging from $377.85 to $378.00. The price above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected.