There is no hard and fast answer that applies in all cases as it is a matter of judgement; and that judgement will vary from company to company. What I would say is that a lot depends on the point that you start.
If your opening position is 'why tell them anything unless we have to' then you are bound to end up in a different place than if you start the process with the view 'let's be open and honest about our past performance, current position and future plans to the maximum extent possible without affecting our competitive position in a material way'.
And, by the way, many organisations would be surprised to find out how much of their 'competitive' information is already well known by their competitors.
