manager	shares	port %	label
Torray Investment Partners	53,622	2.0%	Add	history
Christopher Davis - Davis Selected Advisers	1,256,840	1.9%	Reduce	history
Warren Buffett - Berkshire Hathaway	27,033,784	2.5%	Add	history
Mairs & Power	2,309	<0.01%	Reduce	history