Additional Information and Where to Find It

In connection with the proposed merger, Ameristar plans to file a definitive proxy statement with the SEC and mail the proxy statement to its stockholders. INVESTORS AND STOCKHOLDERS ARE URGED TO READ THE PROXY STATEMENT AND OTHER PROXY MATERIALS WHEN THEY BECOME AVAILABLE AS THEY WILL CONTAIN IMPORTANT INFORMATION ABOUT PINNACLE, AMERISTAR, THE PROPOSED MERGER AND RELATED MATTERS. The proxy statement, as well as other filings containing information about Pinnacle and Ameristar will be available, free of charge, from the SEC's web site ( www.sec.gov). Pinnacle's SEC filings in connection with the transaction also may be obtained, free of charge, from Pinnacle's website ( www.pnkinc.com) under the tab "Investor Relations" and then under the heading "SEC Filings," or by directing a request to Pinnacle, 8918 Spanish Ridge Ave., Las Vegas, Nevada, 89148, Attention: Investor Relations or (702) 541-7777. Ameristar's SEC filings in connection with the transaction also may be obtained, free of charge, from Ameristar's website ( www.ameristar.com) under the tab "About Us," "Investor Relations" and then under the heading "Ameristar Casinos SEC Reports & Filings," or by directing a request to Ameristar, 3773 Howard Hughes Parkway, Suite 490 South, Las Vegas, Nevada, 89169, Attention: Investor Relations or (702) 567-7000.

Participants in the Merger Solicitation

Pinnacle and Ameristar and their respective directors and executive officers and other persons may be deemed to be participants in the solicitation of proxies in connection with the proposed merger. Information about Pinnacle's directors and executive officers is included in Pinnacle's Annual Report on Form 10-K/A for the year ended December 31, 2011, filed with the SEC on May 16, 2012 and the proxy statement for Pinnacle's 2012 Annual Meeting of Stockholders, filed with the SEC on April 9, 2012. Information about Ameristar's directors and executive officers is included in Ameristar's Annual Report on Form 10-K for the year ended December 31, 2011, filed with the SEC on February 28, 2012 and the proxy statement for Ameristar's 2012 Annual Meeting of Stockholders, filed with the SEC on April 30, 2012. Additional information regarding these persons and their interests in the merger will be included in the definitive proxy statement relating to the merger when it is filed with the SEC. These documents can be obtained free of charge from the sources indicated above.
CONTACT: Pinnacle Entertainment Contacts:                  Investor Relations         Vincent J. Zahn, CFA         Vice President, Finance and Investor Relations         702/541-7777 or investors@pnkmail.com                  Media Relations         Kerry Andersen         Director, Public Relations         337/395-7631 or kandersen@pnkmail.com                  Ameristar Casinos Contacts:                  Investor Relations         Thomas Steinbauer         Senior Vice President, Chief Financial Officer         (702) 567-7030 or tom.steinbauer@ameristar.com                  Media Relations         Roxann M. Kinkade, APR         Director of Communications         (816) 414-7007 or roxann.kinkade@ameristar.com

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