(a) DexCom, Inc. ("DexCom") held its Annual Meeting of Shareholders on May 31, 2012 (the "Annual Meeting"). Proxies for the Annual Meeting were solicited pursuant to Regulation 14A of the Securities Exchange Act of 1934, as amended.

(b) The matters described below were voted on at the Annual Meeting and the number of votes cast with respect to each matter was as indicated:

(1) Holders of DexCom's common stock voted to elect three directors, each to serve until his successor has been elected and qualified or until his earlier resignation or removal as follows:

 Name                      For            Against        Abstentions       Broker Non-Votes
 Terrence H. Gregg       56,282,268       2,224,917             7,880              6,342,886
 Kevin Sayer             55,246,695       3,260,290             8,080              6,342,886
 Nicholas Augustinos     56,263,055       2,243,715             8,295              6,342,886

(2) Holders of DexCom's common stock voted to ratify the appointment of Ernst & Young LLP as its independent registered public accounting firm for the fiscal year ending December 31, 2012:

                      Shares Voted in Favor:     64,479,282
                      Shares Voted Against:         372,783
                      Shares Abstaining:              5,886

(3) Holders of DexCom's common stock voted to approve the non-binding advisory resolution on compensation paid to DexCom's named executive officers, as disclosed pursuant to Item 402 of Regulation S-K, including compensation discussion and analysis, compensation tables and narrative discussion:

                      Shares Voted in Favor:     57,841,502
                      Shares Voted Against:         488,109
                      Shares Abstaining:            185,454
                      Broker Non-Votes:           6,342,886