Cubist to Announce First Quarter 2013 Financial Results on Thursday, April 18th, 2013

  Cubist to Announce First Quarter 2013 Financial Results on Thursday, April
  18th, 2013

               Earnings Conference Call & Webcast at 5:00 pm ET

Business Wire

LEXINGTON, Mass. -- April 11, 2013

Cubist Pharmaceuticals, Inc. (NASDAQ: CBST) will issue its first quarter 2013
financial results at 4:00 pm ET on Thursday, April 18^th, 2013. In connection
with this announcement, Cubist will host a conference call and live audio
webcast presentation at 5:00 pm ET that same day to discuss its first quarter
financial results, business activities, and financial outlook.

The quarterly earnings call will be available via phone and webcast. The
conference call dial-in information is listed below. To access the webcast,
please log on to the site at least 15 minutes prior to the start of the call
to ensure adequate time for any software downloads that may be required.

A replay of the webcast and teleconference will be available on Cubist’s
website beginning approximately three hours after the call.

               ***********************CONFERENCE CALL & WEBCAST
                      INFORMATION***********************

                       CUBIST Q1 2013 FINANCIAL RESULTS
                    Thursday, April 18, 2013 at 5:00 pm ET

                 U.S./Canada Attendee Dial-in: (855) 319-7654
                International Attendee Dial-in: (484) 756-4327
                         Attendee Passcode: 27242301

                  24-HOUR REPLAY U.S./CANADA: (855) 859-2056
                 24-HOUR REPLAY INTERNATIONAL: (404) 537-3406
                           Conference ID: 27242301

        CALL WILL ALSO BE BROADCAST LIVE, LISTEN ONLY, VIA THE WEB AT:
    https://cubist.webex.com/cubist/onstage/g.php?t=a&d=624937217 Attendee
                               Password: 041813

            Replay will be available for 90 days at www.cubist.com

*********************************************************************************

About Cubist

Cubist Pharmaceuticals, Inc. is a biopharmaceutical company focused on the
research, development, and commercialization of pharmaceutical products that
address significant unmet medical needs in the acute care environment. Cubist
is headquartered in Lexington, Mass. Additional information can be found at
Cubist’s website at www.cubist.com.

Contact:

INVESTORS:
Cubist Pharmaceuticals, Inc.
Eileen C. McIntyre, 781-860-8533
Vice President, Investor Relations
eileen.mcintyre@cubist.com
or
MEDIA:
Cubist Pharmaceuticals, Inc.
Julie DiCarlo, 781-860-8063
Senior Director, Corporate Communications
julie.dicarlo@cubist.com