Proved Reserves Increased 42 Percent to 364.7 Million Barrels of Oil Equivalent

Earnings Conference Call Scheduled for Thursday, Feb. 24 at 10 a.m. ET

Third Quarter Daily Production Seven Percent Higher Than Second Quarter 2010

Third Quarter Conference Call Scheduled for Thursday, November 4, 2010 at 10 a.m. ET

$1.36 Billion Capital Expenditure Budget for 2011

Company Announces Additional Strong Well Completions in North Dakota and Montana

2Q 2010 Production Increases Nine Percent Over 1Q 2010 EBITDAX Grows 99 Percent to $211.6 Million $101.7 Million in Net Income, or $0.60 Per Share Significant Confirmation Well Announced in Anadarko Woodford Play

Second Quarter Conference Call Scheduled for Thursday, August 5, 2010 at 10 a.m. ET

2010 Production Growth Guidance Raised to a Range of 15-to-17 Percent

North Dakota Bakken Estimated Reserve Model Raised 20 Percent to 518,000 Barrels Per Well ND Bakken Production More than Double First Quarter of 2009 Company Increases Bakken Lease Position to 773,053 Net Acres

First Quarter Conference Call Scheduled for Thursday, May 6, 2010 at 10 a.m. ET

Ten Early 2010 Bakken Wells Average 1,345 Boe in Initial One-Day Tests

2009 Proved Reserves Increase 62 percent, Replacing 811 Percent of 2009 Production Capital Expenditure Budget Increased 31 Percent to $850 Million to Accelerate Drilling Successful Anadarko Woodford Drilling Extends Cana Play Potential 40 Miles Northwest

Hendrickson 1-36H Sets New Company Production Record for Bakken Company-Operated 4Q09 Three Forks/Sanish Wells Average 1,242 Barrels of Oil Equivalent per Day