OKSB Southwest Bancorp, Inc.

Southwest Bancorp, Inc. (Nasdaq:OKSB) (Nasdaq:OKSBP), ("Southwest"), will be presenting at Keefe Bruyette & Woods 2013 Community Bank Investor Conference in New York City, New York, on July 31, 2013, at 1:30 p.m. EDT.

Interested investors may access a live broadcast of the presentation through Keefe Bruyette & Woods' website, www.wsw.com/webcast/kbw12/oksb, or through the Company's website at www.oksb.com. A replay of the presentation will be available through the Company's website for thirty days after the event.

Southwest Bancorp and Subsidiaries

Southwest is the bank holding company for Stillwater National Bank and Trust Company ("Stillwater National") and Bank of Kansas. Through its subsidiaries, commercial and consumer lending, deposit and investment services, specialized cash management, and other financial services are offered from offices in Oklahoma, Texas, and Kansas. Stillwater National was chartered in 1894 and Southwest was organized in 1981 as the holding company. At June 30, 2013, Southwest had total assets of $2.0 billion, deposits of $1.6 billion, and shareholders' equity of $249.4 million.

Southwest's common stock is traded on the NASDAQ Global Select Market under the symbol OKSB. Southwest's public trust preferred securities are traded on the NASDAQ Global Select Market under the symbol OKSBP.

CONTACT: For additional information:
         Mark W. Funke
         President & CEO
         Joe T. Shockley, Jr.
         EVP & CFO
         (405) 372-2230