Assumes a 20% tax rate (per the Company), a seven-year life because there is a put/call feature at year seven, an 8% high-yield coupon (which was 63 basis points higher than the average high-yield transaction in Q42012), and a starting stock price of $12.12, which was the closing price on October 10, 2013, the day before the transaction was priced. Source: CapitalIQ and Clinton Group analysis, including all acquisitions with a purchase price of at least $60 million. The other two transactions were the purchase of Nextwave Wireless by AT&T in 2012 and the acquisition of OneSource Services Inc. by ABM Industries in 2007. CLINTON RELATIONAL OPPORTUNITY MASTER FUND, L.P., CLINTON MAGNOLIA MASTER FUND, LTD., CLINTON SPOTLIGHT MASTER FUND, L.P., CLINTON RETAIL OPPORTUNITY PARTNERSHIP, L.P., CLINTON RELATIONAL OPPORTUNITY, LLC, CLINTON GROUP, INC. AND GEORGE E. HALL (COLLECTIVELY, " CLINTON") AND CHARLES R. ENGLES, SETH E. GARDNER, MICHAEL MCMULLEN, MICHAEL MCNAMARA, PATRICE E. MERRIN, BRIAN SCHWEITZER AND GREGORY P. TAXIN (TOGETHER WITH CLINTON, THE "PARTICIPANTS") HAVE FILED WITH THE SECURITIES AND EXCHANGE COMMISSION (THE "SEC") A DEFINITIVE PROXY STATEMENT AND ACCOMPANYING FORM OF PROXY CARD TO BE USED IN CONNECTION WITH THE PARTICIPANTS' SOLICITATION OF PROXIES FROM THE STOCKHOLDERS OF STILLWATER MINING COMPANY (THE "COMPANY") FOR USE AT THE COMPANY'S 2013 ANNUAL MEETING OF STOCKHOLDERS (THE "PROXY SOLICITATION"). ALL STOCKHOLDERS OF THE COMPANY ARE ADVISED TO READ THE DEFINITIVE PROXY STATEMENT AND OTHER DOCUMENTS RELATED TO THE PROXY SOLICITATION BY THE PARTICIPANTS BECAUSE THEY CONTAIN IMPORTANT INFORMATION, INCLUDING ADDITIONAL INFORMATION RELATED TO THE PARTICIPANTS. THE DEFINITIVE PROXY STATEMENT AND ACCOMPANYING PROXY CARD HAVE BEEN FURNISHED TO SOME OR ALL OF THE COMPANY'S STOCKHOLDERS AND ARE, ALONG WITH OTHER RELEVANT DOCUMENTS, AVAILABLE AT NO CHARGE ON THE SEC'S WEB SITE AT HTTP://WWW.SEC.GOV/. IN ADDITION, OKAPI PARTNERS LLC, CLINTON'S PROXY SOLICITOR, WILL PROVIDE COPIES OF THE DEFINITIVE PROXY STATEMENT AND ACCOMPANYING PROXY CARD WITHOUT CHARGE UPON REQUEST BY CALLING (212) 297-0720 OR TOLL-FREE AT (855) 305-0857. INFORMATION ABOUT THE PARTICIPANTS AND A DESCRIPTION OF THEIR DIRECT OR INDIRECT INTERESTS BY SECURITY HOLDINGS IS CONTAINED IN THE DEFINITIVE PROXY STATEMENT ON SCHEDULE 14A FILED BY CLINTON WITH THE SEC ON MARCH 26, 2013. THIS DOCUMENT CAN BE OBTAINED FREE OF CHARGE FROM THE SOURCES INDICATED ABOVE.