Founder/CEO of PE-owned, tech-enabled swag company Brilliant, selling swag to large enterprises, plus several other startups (bootstrapped, PE- and venture-backed). Software engineer, investor, designer, operator. ex AngelList, BCG, Bain, Harvard Law
It depends completely on the legal documents you both signed related to his investment in the company. Those documents will either provide for "information rights" or not. If the documents don't stipulate to these kinds of rights, you are not obliged to show the investor anything.