Second National Market enables Small and Medium Sized Enterprises (SME's) that promise a growth potential and those companies that fail to meet the listing criteria of  National Market,  to have their stocks traded on the stock exchange.  
 
The purposes of  Second National Market are;
- to ensure that stock prices are formed in a regular and transparent market under competitive conditions;
- to provide liquidity to stocks, 
and thereby, to create inexpensive funding and growth potential for the companies, providing them with the opportunity to supply funding from the capital market.
 
The authority to determine the stocks to be traded on the Secondary National Market rests with the Executive Council of Istanbul Stock Exchange. 
 
The principles governing trading and settlement on the Listed Market (National Market) also extend to Second National Market.