Investcorp has acquired a half-interest in Corsair Capital’s nearly $5 billion infrastructure business, injecting the Bahrain-based firm into a global industry and giving Corsair a capital boost as sheer heft becomes increasingly important in attracting institutional investors to new funds.

New York-based Corsair, which also makes buyout investments, managed $9.6 billion at the end of September, including $4.8 billion in infrastructure assets mostly in transportation and logistics. Among those holdings is management company Vantage Airport Group, which helped build the new Terminal B at New York’s LaGuardia Airport and is working on another at John F. Kennedy International Airport.