About Natixis Investment Managers Natixis Investment Managers serves financial professionals with more insightful ways to construct portfolios. Powered by the expertise of more than 20 specialized investment managers globally, we apply Active Thinking ® to deliver proactive solutions that help clients pursue better outcomes in all markets. Natixis Investment Managers ranks among the world's largest asset management firms 1 with nearly $1.4 trillion assets under management 2 (€1,135.5 billion).