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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
72020	Nicor Inc	GAS	Natural Gas Distribution (4924)	362855175

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1141658	L Richard Hawley	Nicor Inc. P.o. Box 3014 Naperville IL 60566	Evp And Cfo	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2011-06-01	10,000	$36.34	24,583	No	4	M	Direct
Common Stock	Acquisiton	2011-06-01	32,600	$37.23	57,183	No	4	M	Direct
Common Stock	Disposition	2011-06-01	2,800	$54.54	54,383	No	4	S	Direct
Common Stock	Disposition	2011-06-01	8,397	$54.55	45,986	No	4	S	Direct
Common Stock	Disposition	2011-06-01	1,400	$54.57	44,586	No	4	S	Direct
Common Stock	Disposition	2011-06-01	100	$54.58	44,486	No	4	S	Direct
Common Stock	Disposition	2011-06-01	2,825	$54.60	41,661	No	4	S	Direct
Common Stock	Disposition	2011-06-01	100	$54.61	41,561	No	4	S	Direct
Common Stock	Disposition	2011-06-01	1,000	$54.64	40,561	No	4	S	Direct
Common Stock	Disposition	2011-06-01	987	$54.70	39,574	No	4	S	Direct
Common Stock	Disposition	2011-06-01	1,315	$54.71	38,259	No	4	S	Direct
Common Stock	Disposition	2011-06-01	1,880	$54.80	36,379	No	4	S	Direct
Common Stock	Disposition	2011-06-01	1,920	$54.81	34,459	No	4	S	Direct
Common Stock	Disposition	2011-06-01	3,775	$54.83	30,684	No	4	S	Direct
Common Stock	Disposition	2011-06-01	3,009	$54.84	27,675	No	4	S	Direct
Common Stock	Disposition	2011-06-01	2,650	$54.85	25,025	No	4	S	Direct
Common Stock	Disposition	2011-06-01	4,263	$54.86	20,762	No	4	S	Direct
Common Stock	Disposition	2011-06-01	1,727	$54.87	19,035	No	4	S	Direct
Common Stock	Disposition	2011-06-01	4,150	$54.90	14,885	No	4	S	Direct
Common Stock	Disposition	2011-06-01	302	$54.92	14,583	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	M	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Employee Stock Option (right to buy)	Disposition	2011-06-01	10,000	$0.00	10,000	$36.34
Common Stock	Employee Stock Option (right to buy)	Disposition	2011-06-01	32,600	$0.00	32,600	$37.23

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0	2007-03-18	2014-03-18	No	4	M	Direct
0	2008-03-17	2015-03-17	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	3,645	Indirect	By 401(k) Plan

Footnotes

Includes 73.821 shares of common stock acquired in May 2011 under the Dividend Reinvestment Plan. Also includes 104.406 shares of common stock acquired in May 2011 under the Employee Stock Purchase Plan.
Shares of Nicor common stock acquired under the Nicor 401(k) Plan. Information based on reporting person's account balance as of May 31, 2011.