DEXCOM INC — Director's Dealing 2018

Oct 3, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: DEXCOM INC (DXCM)
CIK: 0001093557
Period of Report: 2018-10-01

Reporting Person: ALTMAN STEVEN R (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-10-01	Common Stock	S	350	$132.6814	Disposed	57505	Indirect
2018-10-01	Common Stock	S	700	$133.5321	Disposed	56805	Indirect
2018-10-01	Common Stock	S	300	$135.815	Disposed	56505	Indirect
2018-10-01	Common Stock	S	650	$137.0069	Disposed	55855	Indirect
2018-10-01	Common Stock	S	300	$138.075	Disposed	55555	Indirect
2018-10-01	Common Stock	S	100	$139.14	Disposed	55455	Indirect
2018-10-01	Common Stock	S	100	$140.875	Disposed	55355	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	3449	Direct

Footnotes

F1: On August 6, 2018, Mr. Altman adopted a 10b5-1 Plan. This 10b5-1 Plan allows the orderly disposition of shares owned by Mr. Altman. 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 $132.14 to $133.06. 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 Steven R. and Lisa J. Altman, TTEE's Altman Family Trust DTD 8/21/92, with respect to which the reporting person is a trustee.

F4: This transaction was executed in multiple trades at prices ranging from $133.21 to $133.90. 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 $135.37 to $136.07. 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.

F6: This transaction was executed in multiple trades at prices ranging from $136.72 to $137.41. 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 $137.80 to $138.24. 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.