deniability has always worked when you don't want to say anything.  We look for some bit of information and they refuse it all.  It seems the only ones that need to know are those that they want to have that information.  the fact that your an investor in that company means nothing.  How many stocks you own in the company means nothing.  All that you need to know is what they want to tell you.  That's a hell of a way to run a company for the last 18 years and they get away with it.  How the SEC allows it is beyond me.