Earnings Conference Call & Webcast at 5:00 pm ET

Cubist Pharmaceuticals, Inc. (NASDAQ: CBST) will issue its third quarter 2014 financial results at 4:00 p.m. ET on Tuesday, October 21, 2014. In connection with this announcement, Cubist will host a conference call and live audio webcast presentation at 5:00 p.m. ET that same day to discuss its third 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 Q3 2014 FINANCIAL RESULTSTuesday, October 21, 2014 at 5:00 pm ET

U.S./Canada Attendee Dial-in: (855) 319-7654International Attendee Dial-in: (484) 756-4327Conference ID: 11866394

24-HOUR REPLAY U.S./CANADA: (855) 859-205624-HOUR REPLAY INTERNATIONAL: (404) 537-3406Conference ID: 11866394

CALL WILL ALSO BE BROADCAST LIVE, LISTEN ONLY, VIA THE WEB AT:https://cubist.webex.com/cubist/onstage/g.php?t=a&d=294736098Attendee Password: 10212014

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

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About CubistCubist Pharmaceuticals, Inc. is a global 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, Massachusetts, with a central international office located in Zurich, Switzerland. Additional information can be found at Cubist’s web site at www.cubist.com. Also, connect with Cubist on Twitter @cubistbiopharma and @cubistcareers, LinkedIn, or YouTube.

Cubist Pharmaceuticals, Inc.INVESTORS:Eileen C. McIntyre, 781-860-8533Vice President, Investor Relationseileen.mcintyre@cubist.comorMEDIA:Julie DiCarlo, 781-860-8063Senior Director, Corporate Communicationsjulie.dicarlo@cubist.com