I have no idea about stocks and shares etc, but I have been offered a time limited stock option at no cost to me. If I exercise the option, I can make over 1 grand today. If I leave it, there is the potential to earn much more, but of course also the risk that the price of the shares will collapse and I'd get next to nothing.
I've looked at the value of the shares over the past few months. The shares have lost some value but not too much. It's made worse by the exchange rate as it's for an American company.