It depends on what your goals are for your business and its scope, but if you have big plans, I HIGHLY recommend these three:

BOLD: How to Go Big, Create Wealth and Impact the World by Peter Diamandis and Steven Kotler

ORIGINALS: How Non-Conformists Move the World by Adam Grant

VENTURE DEALS: Be Smarter Than Your Lawyer and Venture Capitalist by Brad Feld and Jason Mendelson