DEXCOM INC — Director's Dealing 2020

May 7, 2020

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: DEXCOM INC (DXCM)
CIK: 0001093557
Period of Report: 2020-05-04

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2020-05-04	Common Stock	S	500	$340.802	Disposed	170042	Direct
2020-05-04	Common Stock	S	300	$341.7133	Disposed	169742	Direct
2020-05-04	Common Stock	S	1219	$343.4557	Disposed	168523	Direct
2020-05-04	Common Stock	S	1587	$344.5055	Disposed	166936	Direct
2020-05-04	Common Stock	S	794	$345.4572	Disposed	166142	Direct
2020-05-04	Common Stock	S	1200	$346.7333	Disposed	164942	Direct
2020-05-04	Common Stock	S	400	$347.675	Disposed	164542	Direct

Footnotes

F1: On May 15, 2019, Mr. Sayer adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Sayer. 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 $340.43 to $341.07. 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 76,187 unvested restricted stock units, 25,453 of which were granted on March 8, 2020 and shall vest through March 8, 2023, 23,886 of which were granted on March 8, 2019 and shall vest through March 8, 2022, and 26,848 of which were granted on March 8, 2018 and shall vest through March 8, 2021.

F4: This transaction was executed in multiple trades at prices ranging from $341.58 to $341.98. 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 $342.98 to $343.86. 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: This transaction was executed in multiple trades at prices ranging from $343.99 to $344.96. 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.

F7: This transaction was executed in multiple trades at prices ranging from $344.99 to $345.82. 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.

F8: This transaction was executed in multiple trades at prices ranging from $346.40 to $347.04. 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.

F9: This transaction was executed in multiple trades at prices ranging from $347.49 to $347.86. 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.