When owners and investors provide funding to companies, whose responsibility is it to maximize the value of their investments by running a profitable business?

It is ultimately the responsibility of the company's management team to maximize the value of their investments by running a profitable business. Owners and investors provide the initial funding, but it is the management team that makes strategic decisions, conducts day-to-day operations, and implements policies and procedures to ensure the company's profitability. Owners and investors may provide guidance and support, but it is up to the management team to execute and drive the company towards financial success.