The following summarizes Common Stock activity for each of the years ended December 31, 2010, 2011 and 2012 (in thousands):

		Common Shares
		Issued	Treasury	Outstanding

Balance at December 31, 2009		252,627	(118)	252,509
	Common Stock Issued Under Equity Compensation Plans	1,482	-	1,482
	Treasury Stock Purchased ⁽¹⁾	-	(115)	(115)
	Common Stock Issued Under Employee Stock Purchase Plan	114	-	114
	Treasury Stock Issued Under Other Equity Compensation Plans	-	87	87
Balance at December 31, 2010		254,223	(146)	254,077
	Common Stock Issued Under Equity Compensation Plans	1,395	-	1,395
	Treasury Stock Purchased ⁽¹⁾	-	(267)	(267)
	Common Stock Issued Under Employee Stock Purchase Plan	135	-	135
	Treasury Stock Issued Under Other Equity Compensation Plans	-	109	109
	Common Stock Sold	13,570	-	13,570
Balance at December 31, 2011		269,323	(304)	269,019
	Common Stock Issued Under Equity Compensation Plans	2,471	-	2,471
	Treasury Stock Purchased ⁽¹⁾	-	(575)	(575)
	Common Stock Issued Under Employee Stock Purchase Plan	164	-	164
	Treasury Stock Issued Under Other Equity Compensation Plans	-	553	553
Balance at December 31, 2012		271,958	(326)	271,632

(1)

Represents shares that were withheld by, or returned to, EOG in satisfaction of tax withholding obligations that arose upon the exercise of employee stock options or stock-settled stock appreciation rights, the vesting of restricted stock or restricted stock unit grants or in payment of the exercise price of employee stock options.