If there is a revolution, then all financial assets are worthless overnight, stocks, bonds, whatever. Even physical assets lose a lot of their value - a factory that can't get raw materials and can't get their product to retailers is worth a great deal less than an identical factory with identical workers that is a going concern.
It's arbitrary who owns it, it just has to be owned. On a very superficial level, it's supply and demand. Increase supply without increasing demand causes price to fall.
Also, if the rich are sitting on wealth which loses values as soon as it is spent, perhaps quite a lot of the "wealth" was never really there in the first place? (although there we are perhaps getting into philosophy)