I can see why people often make this mistake. A public company is required to disclose its financial data, which is then subject to analyst scrutiny, shareholder scrutiny and public scrutiny. It’s easier to obtain data for public companies, so people assume they need to fly blind when they have a private business partner. This isn’t true! Raising your expectations and communicating with your private companies on why this information helps you build a better partnership will help you obtain their financials.