manager	shares	port %	label
John Rogers - Ariel Investments	6,364,528	2.0%	Add	history
Ron Baron - Bamco Inc. (Baron Capital)	2,016,330	0.18%	Reduce	history
Thomas Gayner - Markel Group	1,327,000	0.48%		history
Vulcan Value Partners	9,813,179	4.5%	Reduce	history