X0306 4 2013-02-28 0000798949 UNIT CORP UNT 0001391171 Parks Robert 7130 SOUTH LEWIS, SUITE 1000 TULSA OK 74136 1 President, Superior Pipeline Common Stock 2013-02-28 4 S 0 5960.0000 45.2094 D 33279.0000 D Common Stock 2659.0000 I By 401(k) Common Stock 100.0000 I By Spouse This transaction was executed in multiple trades at prices ranging from $45.12 - $45.30, inclusive. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide Unit Corporation, any security holder of Unit Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the stated range. This information is based on a plan statement dated February 28, 2013. By April Adler under POA 2013-03-01