His personal 'conduct' reflected poorly on the company. [=he behaved in a way that made the company look bad]
The way you 'conduct yourself' in an interview often determines whether or not you get the job.
Laws and regulations control the 'conduct' [='management'] 'of' business and trade.
(..) I have to tell you, you behaved improperly today. How is that? By making plain your feeling when one of the riders fell. Your conduct was improper. It must not occur again. I have said it before. You will say my concern is unnecessary and ridiculous. You are my wife. I'm wrong to think that. (..)2012 Anna Karenina