DEXCOM INC — Director's Dealing 2021

Jan 6, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: DEXCOM INC (DXCM)
CIK: 0001093557
Period of Report: 2021-01-04

Reporting Person: DOUBLEDAY RICHARD (EVP Chief Commercial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2020-12-29	Common Stock	G	950	$0.0	Disposed	32549	Direct
2021-01-04	Common Stock	S	27	$362.9633	Disposed	32522	Direct
2021-01-04	Common Stock	S	28	$365.1559	Disposed	32494	Direct
2021-01-04	Common Stock	S	10970	$366.07	Disposed	21524	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	9983	Indirect

Footnotes

F1: The transaction represents a gift by the Reporting Person of 950 shares to a charitable donor advised fund.

F2: Included in this number are 3,916 unvested restricted stock units that will be forfeited to the Company on April 1, 2021 in accordance with Mr. Doubleday's Transition & Consulting Agreement.

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 RSUs. 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: This transaction was executed in multiple trades at prices ranging from $362.84 to $363.0623. 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 $365.0432 to $365.1871. 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.

F6: Shares are held by the Doubleday Living Trust U/A/D 5/26/2015, with respect to which the reporting person is a trustee.