The Mattel Inc. logo is displayed outside the headquarters of the toy company known for products including Barbie and Hot Wheels in El Segundo, California, on June 8, 2023.Activist investor Barington Capital is pushing Mattel to consider selling off its American Girl and Fisher-Price brands, citing underperformance within the divisions.Mattel shares were up around 3% in premarket trading Friday following a letter sent to Mattel Thursday, which was first reported by the Wall Street Journal. The toymakers sha ...