Trading on information which is not really available to the general public. Trading in a Company's shares by a connected person having non-public, price sensitive information, such as expansion plans, financial results, takeover bids, etc., by virtue of his association with that Company, is called insider trading.

An investment is said to be illiquid if it cannot easily be turned back into cash quickly and at a low cost.
Shares in smaller companies are more likely to be illiquid than those in larger companies; they will be less easy to sell and you are likely to find that the spread or difference between the buying and selling price is much wider.So, in other words blue chip shares are more liquid than unquoted companies.

Insider
Someone who trades a security on the back of knowledge which is not available to the world at large and who, thereby, makes a profit.

Issuing house
This is a member of the Issuing Houses Association, responsible for sponsoring the issue of a new security on the Stock Exchange or an over the counter market.The definition has also spread to include any merchant bank or dealer in securities which is involved in such an issue.The issuing house will have been closely involved in the process leading up to the flotation and will have advised the company on its timing, pricing, etc.

Issued Share Capital
This is the total number of shares a company has made publicly available multiplied by the total nominal value of the shares.

An Immediate or Cancel (IOC) order allows a user to buy or sell a security as soon as the order is released into the market, failing which the order is removed from the market. There could be a partial match for such an order resulting in one or more trades, in which case the balance order will be removed from the market.

Shares which are seldom bought and sold in the stock exchange, although they are listed. A share which is transacted less than four times a year may be called inactive or dead. It is quite difficult to find a buyer or a seller for such shares. The Spread between buying and selling prices can be large.