This Wednesday, June 20, 2012, photo shows a Burger King sign in Richardson, Texas. The world's No. 2 hamburger chain began trading as a public company again Wednesday under the ticker symbol âBKWâ for TKTKT a share. The Miami-based chain had last traded as a public company between 2006 and 2010, before it was purchased and taken private by investment firm 3G Capital. ( ( AP Photo/LM Otero)