Mattel is the worldwide leader in the design, manufacture, and marketing of toy products. The company's core brands include barbie. hot wheels. matchbox Fisher-Price, and American Girl. With headquarters in El Segundo, California, Mattel has offices and facilities in 36 countries and sells its products in more than 150 nations throughout the world.• Mattel is the worldwide leader in the design, manufacture, and marketing of toy products. The company's core brands include Barbie, Hot Wheels, Matchbox, Fisher-Price, and American Girl. With headquarters in El Segundo, California, Mattel has offices and facilities in 36 countries and sells its products in more than 150 nations throughout the world