DEXCOM INC — Director's Dealing 2018

May 26, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: DEXCOM INC (DXCM)
CIK: 0001093557
Period of Report: 2018-05-23

Reporting Person: DOUBLEDAY RICHARD (EVP, Chief Commercial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-05-23	Common Stock	S	2581	$85.9987	Disposed	6229	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	94429	Direct

Footnotes

F1: On May 16, 2017 Mr. Doubleday adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Doubleday. 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 $85.76 to $86.37. 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: Shares are held by the Doubleday Living Trust U/A/D 5/26/2015, with respect to which the reporting person is a trustee.