Greenhill & Co. | 56,319 followers on LinkedIn. Greenhill & Co., Inc. is a leading investment bank focused on providing financial advice on significant mergers, acquisitions, restructurings, financings and capital raising to corporations, partnerships, institutions and governments. It acts for clients located throughout the world from its offices in New York, Chicago, Frankfurt, Hong Kong, Houston, London, Madrid, Melbourne, Paris, San Francisco, Singapore, Stockholm, Sydney, Tokyo and Toronto. In November 2023 we were acquired by Mizuho Financial Group.