John Alexander Thain is an American businessperson who founded Pine Island Capital Partners LLC and who has been the head of 13 different companies. Presently, he occupies the position of Chairman of Pine Island Acquisition Corp. and Chairman of Pine Island Capital Partners LLC. Mr. Thain is also on the board of 9 other companies.

In the past he was Chairman of CIT Group, Inc., Executive Chairman of Efficient Finance Ltd., President & Chief Operating Officer for The Goldman Sachs Group, Inc., President-Global Banking & Securities Division at Bank of America Corp. Chairman for Merrill Lynch & Co. Canada Ltd. Chairman & Chief Executive Officer of Merrill Lynch & Co., Inc. Chairman & Chief Executive Officer for Merrill Lynch & Co., Inc. Chairman & Chief Executive Officer for Merrill Lynch, Pierce, Fenner & Smith, Inc. (Old), Chairman & Chief Executive Officer at Merrill Lynch, Pierce, Fenner & Smith, Inc. (Old) and Chairman & Chief Executive Officer for Merrill Lynch Canada, Inc. (which are all subsidiaries of Bank of America Corp.), Chief Executive Officer & Director at NYSE Euronext, Chief Executive Officer & Director at New York Stock Exchange, Inc. and Chief Executive Officer & Director at NYSE Group, Inc.

He received an undergraduate degree from Massachusetts Institute of Technology and an MBA from Harvard Business School.