I see many many letters sent from the ASX to shares that have...

I see many many letters sent from the ASX to shares that have jumped or fallen without explanation. Sure, many are pumped externally by tipsters who are already in. Beware of them.

What bugs me is I have yet to see a response to an ASX letter that is not in denial. Do they ever do more than write a letter and file the response?

It must be quite easy for companies to buy into their own shares with nominee cover. I am sure it happens. Is it allowed? I know not. There is an ASX regulation that compels companies buying (a good signal generally) or intending their own stock to disclose the fact but whether the ASX audits the activity of nominess is not clear.

Anyone who can help here?