text: if i want to sell some shares that ive brough from the stockmarket how can i be sure they will sell ? for example; if i got them on monday and by friday they had increased, how do i know that i can offload them ? is there always a guarantee that someone will buy them ? if the share is quoted on the main london stock exchange market one broker will have been assigned to act as the market maker.  that means that they are given preferential trading rights and in return they agree to act as a buyer when someone else wants to sell and the seller when someone else wants to buy.  you can't guarantee the price you will receive but there will always be someone there to buy them.  as the last resort the market maker has to buy them off you.