X0303 4 2011-06-06 0 0000072020 NICOR INC GAS 0001205607 DALESSANDRO ROCCO J NICOR INC. 1844 FERRY ROAD NAPERVILLE IL 60563 0 1 0 0 EVP - Nicor Gas Company Common Stock 2011-06-06 4 M 0 4725 37.23 A 8635.77 D Common Stock 2011-06-06 4 S 0 725 53.81 D 7910.77 D Common Stock 2011-06-06 4 S 0 800 53.951 D 7110.77 D Common Stock 2011-06-06 4 S 0 200 53.96 D 6910.77 D Common Stock 2011-06-06 4 S 0 1000 53.993 D 5910.77 D Common Stock 2011-06-06 4 S 0 1000 54.041 D 4910.77 D Common Stock 2011-06-06 4 S 0 1000 54.10 D 3910.77 D Common Stock 2011-06-07 4 M 0 4725 37.23 A 8635.77 D Common Stock 2011-06-07 4 S 0 100 53.91 D 8535.77 D Common Stock 2011-06-07 4 S 0 3248 53.95 D 5287.77 D Common Stock 2011-06-07 4 S 0 144 53.9501 D 5143.77 D Common Stock 2011-06-07 4 S 0 401 53.96 D 4742.77 D Common Stock 2011-06-07 4 S 0 600 53.97 D 4142.77 D Common Stock 2011-06-07 4 S 0 232 53.98 D 3910.77 D Employee Stock Option (right to buy) 37.23 2011-06-06 4 M 0 4725 0 D 2008-03-17 2015-03-17 Common Stock 4725 4725 D Employee Stock Option (right to buy) 37.23 2011-06-07 4 M 0 4725 0 D 2008-03-17 2015-03-17 Common Stock 4725 0 D Antoinette M. Lambert - Attorney-in-Fact 2011-06-08