Item 7.01 Regulation FD Disclosure.
On April 16, 2009, Southwest Bancorp, Inc. issued a press release regarding its results of operations and financial condition for the quarter ended March 31, 2009. The text of the press release is included as Exhibit 99 to this report. Southwest Bancorp will include final financial statements and additional analyses as part of its Quarterly Report on Form 10-Q for the quarter ended March 31, 2009.
Item 9.01 Financial Statements and Exhibits.
(a) Financial statements of businesses acquired. Not applicable.
(b) Pro forma financial information. Not applicable.
(c) Exhibits. Exhibit 99-Press Release dated April 16, 2009.
Signatures Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

SOUTHWEST BANCORP, INC.

By: /s/ Kerby E. Crowell
Kerby E. Crowell
Executive Vice President, Chief Financial Officer and Secretary

Dated: April 16, 2009