I would have to say;
NO, you could not sue...and
YES, as long as the shares of CUSPID 493312201 are registered (which is exactly what having a CUSPID number means), then they would be valued at the current asking price, should one choose to sell. The shares of KEYO are registered. As of today.
It is well to remember that the entire universe, with one trifling exception, is composed of others. — John Andrew Holmes