On May 7, 2026, Southeastern Asset Management, Inc. announced that it has filed an exempt solicitation statement with Securities and Exchange Commission, and issued an open letter on May 7, 2026, urging Mattel, Inc. to explore a sale or merger to maximize value, citing that the public market undervalues the Company. In addition, Southeastern Asset Management proposed potential acquisition by private equity, strategic competitors like Hasbro, or major media companies, while questioning Mattel?s 2026 investment strategy.