Share value

market value only 

If your shares are listed in any of the stock exchanges and they are regularly traded in the stock exchange, you can sell it at the quoted price. The sale will have to be done through a broker. If you have an online facility for trading you can sell it online. If the share is not listed in the stock exchange or listed but not regularly traded you will have to find a buyer as for any other commodity. You will sell it at any price as agreed between you two, again, as in the case of any other commodity. The above is applicable to shares held in dematerialised form. If you hold the shares in physical form i.e. as share certificate you sell it by contacting the broker only. All these are for shares in public companies. Shares sold outside of stock exchanges are subject to capital gains tax.