Greenhill

Greenhill does not invest proprietary capital. Instead, advisory decisions are driven by its senior managing directors across sectors and geographies. Post-acquisition, Kevin Costantino and David Wyles are the most senior operational leaders overseeing the firm's advisory franchise within Mizuho.

Greenhill itself does not lend or underwrite securities — its advisory model is free of balance-sheet conflicts. However, as part of Mizuho, clients of the combined platform can access capital markets and lending through the parent bank if they choose, which represents a structural shift from Greenhill's pure-advisory independence.

Greenhill operates as a distinct subsidiary of Mizuho, with its own leadership, brand, and advisory mandate. Integration efforts have focused on pairing Greenhill's M&A and restructuring capabilities with Mizuho's balance sheet and client relationships, particularly in cross-border transactions between Japan and Western markets.

Greenhill focuses on three core areas: M&A advisory, restructuring and recapitalization, and private capital advisory. The firm does not manage investment portfolios, lend, trade, or provide research — a deliberate scope that has been central to its identity since 1996.