X0303 4 2010-08-10 0 0001034755 BRIGHAM EXPLORATION CO BEXP 0001238743 LARSON JEFFREY E 6300 BRIDGE POINT PARKWAY BLDG 2 SUITE 500 AUSTIN TX 78730 0 1 0 0 Executive V.P. Exploration Common stock, par value $.01 2010-08-10 4 M 0 32275 5.955 A 74972 D Common stock, par value $.01 2010-08-10 4 S 0 32275 16.9903 D 42697 D Incentive Stock Options (right to buy) 5.955 2010-08-10 4 M 0 32275 0 A 2010-08-10 2019-08-10 Common Stock, par value $.01 per share 32275 129100 D Exercise of employee stock option to purchase 32,275 shares of common stock pursuant to reporting person's existing 10b5-1 trading plan. Sale of common stock acquired as a result of the exercise of an employee stock option pursuant to the reporting person's existing 10b5-1 trading plan. $16.9903 was the weighted average sales price for the transaction reported. The sales prices ranged from a low of $16.90 to a high of $17.23. Upon request, the reporting person will provide to the SEC staff, the issuer or any security holder of the issuer full information regarding the number of shares sold at each separate price. /s/ Jeffery E. Larson 2010-08-12