If you release private information on an exchange (by for example, buying up a million shares), first, you just committed insider trading, which is illegal, and

If you release private information on an exchange (by for example, buying up a million shares), first, you just committed insider trading, which is illegal, and second, you just made that private information public (showing that their is a much greater demand than the market believed). Once it hits the exchange, it is public information, and anybody is now free to act on that information.