D Charles Davidson

Insider Trading: Sales
Company Symbol Price Amount Relationship Remaining Holdings Date Form 4
NBL $74.10 37,500 337,218 2010-09-03 Filing
NBL $69.08 37,500 314,718 2010-08-09 Filing
NBL $80.19 400 292,218 2010-04-23 Filing
NBL $80.18 3,374 292,618 2010-04-23 Filing
NBL $80.13 2,200 295,992 2010-04-23 Filing
NBL $80.11 5,000 298,192 2010-04-23 Filing
NBL $80.09 234 303,192 2010-04-23 Filing
NBL $80.07 9,334 303,426 2010-04-23 Filing
NBL $80.06 3,300 312,760 2010-04-23 Filing
NBL $80.03 4,403 316,060 2010-04-23 Filing
NBL $80.02 2,988 320,463 2010-04-23 Filing
NBL $80.01 1,894 323,451 2010-04-23 Filing
NBL $80.00 16,873 325,345 2010-04-23 Filing
NBL $75.02 700 243,725 2010-01-05 Filing
NBL $75.00 49,300 244,425 2010-01-05 Filing