Company Profile

Patterson-UTI Energy, Inc. provides onshore contract drilling services to exploration and production companies in North America. The Company has approximately 350 marketable land-based drilling rigs that operate primarily in oil and natural gas producing regions of Texas, New Mexico, Oklahoma, Arkansas, Louisiana, Mississippi, Alabama, Colorado, Arizona, Utah, Wyoming, Montana, North Dakota, South Dakota, Pennsylvania, West Virginia and western Canada. Patterson-UTI Energy, Inc. is also engaged in the businesses of pressure pumping services and drilling and completion fluid services.

Shareholder Information Exchange NASDAQ Global Market (.O) Stock Quote (PTEN) 14.95  As of 11/20/2009 4:00 PM Minimum 20 minutes delayed Listed Security PTEN Common Shares Transfer Agent Continental Stock Transfer & Trust 2 Broadway New York, NY 10004  Phone (212) 509-4000 Corporate Counsel Fulbright & Jaworski LLP Independent Accountants PricewaterhouseCoopers