By definition "Insider trading is when company insiders such as promoters, senior management and directors trade in the stock of their own company on the basis of information which is not available to the public shareholders". Under current insider trading norms promoters and other company insiders have to make a disclosure with the stock exchange within five days of the trades.
Security Exchange Noard of India or Sebi’s committee feels the post-trade disclosure puts minority shareholders at disadvantage and hence under proposed new norms promoters and top executives, intending to buy or sell shares of their companies, will have to inform the market well in advance before such transactions. Once Sebi makes it a rule, promoters and insiders may have to specify a window, maybe up to three months in prior, during which they would buy or sell their own shares.