APO vs AON Comparison

Apollo is one of the world's largest alternative asset managers, with $908.4 billion in total assets under management, or AUM, including $685.0 billion in fee-earning assets, at the end of September 2025. The company has two core operating segments: asset management and retirement services. Apollo operates with scale in each of its major product lines—private equity (with $125.6 billion in total AUM and $71.7 billion in fee-earning AUM), real estate/real assets ($59.6 billion/$27.1 billion), and private credit ($723.2 billion/$586.2 billion). Apollo has a distribution profile that is likely not too far off from the industry averages—with 84% of its assets held by institutional investors and 16% by high-net-worth clients.

Aon is a leading global provider of insurance and reinsurance brokerage and human resources solutions. Its operations are tilted toward its brokerage operations. Headquartered in London, Aon has about 50,000 employees and operations in over 120 countries.