October 3, 2005

Tulsa, Oklahoma . . . Unit Corporation (NYSE – UNT) announced today that it will participate in the Independent Petroleum Association of America’s 2005 Oil and Gas West Investment Symposium, which will be held October 5th – 7th in San Francisco. Unit’s presentation will be broadcast live on the Internet on Friday, October 7th at 9:40 a.m. Pacific Time (12:40 p.m. Eastern Time). Listeners may access the webcast via the Company’s website at www.unitcorp.com.

Unit Corporation is a Tulsa-based, publicly held energy company engaged through its
subsidiaries in oil and gas exploration, production and contract drilling. Unit’s Common Stock is listed on the New York Stock Exchange under the symbol UNT. For more information about Unit Corporation, visit our website at http://www.unitcorp.com.