Shouldn't be value of this company readjusted automatically?
Or even better, I think that stored products shouldn't be counted into assets (for selling purposes) at all. Everyone can put fully stocked company on market and then withdraw all content before it's sold. Efectivelly theft - charging for something, you don't deliver.
Those cannot be moved out of company while it is on sale?
yes, goods can be moved to warehouse, but you're good to check the fin report page which tells you assets available.
also, when you click buy, window pops up with building, equipment, tech, stored goods, etc value, with sale price, so you can easily see if the value is what you are after.
last thing - when you buy, it's yours immediately. once you have checked that the enterprise is what you are looking for and buys that, your funds are immediately debited, and the enterprise is yours, so the other company can't move any goods.