New non execs Shannon Coates & Erlyn Dale, page-2

A little advice from experts I never had to deal with a stock in this situation, just asking here holding my x amount of shares here for months from now let's say, would that keep the amount of shares unchanged ? And only the SP will change with time correct?
I heard an instance on another co where the holder got a letter from the co saying that " your shares have been changed from 1000 to 100 as per a meting resolution " can that happen?