> he charges clients much more than he tells me Wouldn't there be a receipt of how much the clients are paying to the company's account? Or do they pay part of

> he charges clients much more than he tells me Wouldn't there be a receipt of how much the clients are paying to the company's account? Or do they pay part of the sum total to the company and part to the co-founder directly? Do they pay him cash? Maybe just gather enough proof of the fraud then show it to him and say he must stop doing that. Surely he would appreciate his fair share of profits as opposed to going to prison. Point is you must have ironclad proof of the fraud.