APO vs O Comparison

Apollo is one of the world's largest alternative asset managers, with $938.4 billion in total assets under management, or AUM, including $709.1 billion in fee-earning assets, at the end of 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 $128.4 billion in total AUM and $75.0 billion in fee-earning AUM), real estate/real assets ($60.8 billion/$27.6 billion), and credit ($749.2 billion/$606.5 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.

Realty Income owns roughly 15,500 properties, most of which are freestanding, single-tenant, triple-net-leased retail properties. Its properties are located in 49 states and Puerto Rico and are leased to 250 tenants from 47 industries. Recent acquisitions have added industrial, gaming, office, manufacturing, and distribution properties, which make up roughly 20% of revenue.