shares

The shares and securities of companies listed on the stock exchange
. The companies are described as 'listed'; their shares are 'quoted' and available for trading to the general public. 

Unquoted securities

shares that r not listed in stock exchange

Right issue

New share offered to existing shareholders in proportion to their current shareholding, for a specified period and at a specified (usually discounted) price. Its objective is to afford  them the opportunity to maintain their percentage of ownership of the firm.