DEXCOM INC — Director's Dealing 2019

May 30, 2019

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: DEXCOM INC (DXCM)
CIK: 0001093557
Period of Report: 2019-05-29

Reporting Person: Blackford Quentin S. (EVP Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2019-05-29	Common Stock	S	5498	$118.7278	Disposed	95116	Direct
2019-05-29	Common Stock	S	3376	$119.3014	Disposed	91740	Direct

Footnotes

F1: On February 27, 2019 Mr. Blackford adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Blackford. The shares set forth above were sold pursuant to the 10b5-1 Plan.

F2: This transaction was executed in multiple trades at prices ranging from $118.18 to $119.15. 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 90,869 unvested restricted stock units, 18,432 of which were granted on March 8, 2019 and shall vest through March 8, 2022, 25,668 of which were granted on March 8, 2018 and shall vest through March 8, 2021 and 46,769 of which were granted on September 7, 2017 and shall vest through September 7, 2021.

F4: This transaction was executed in multiple trades at prices ranging from $119.18 to $119.50. 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.