The watchdog also proposed restrictions on investment amount in case of retail investor and allocation to such investors in base issue size.
Sebi feels that there is need for an additional layer of protection for retail investors, who get attracted towards such debt securities which though on one side pay higher coupon rate but on the other side have a below investment grade credit rating.
The regulator has sought comments from public till January 29 on the proposals and final regulation would be put in place after taking into consideration suggestions of all the stakeholders.
Since rating is an important factor to make an investment decision, Sebi said that an easier and better alternative should be introduced the rating in a pictograph. The pictorial representation may be similar to a 'Risk-o-meter' which was introduced in the offer documents schemes of mutual funds or like a speedometer in a car.
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Besides, an asterisk mark should be put on the 'Risk-o-meter' and an explanation of all the credit ratings provided by the credit rating agency should be printed on the back side of the front page in tabular format so that the investors can understand the relevance of the credit rating of that issue vis-a-vis other ratings provided by the credit rating agency.
As unsecured NCDs contain higher risk than secured ones, for unsecured NCDs, the allocation to retail investor should not be more than a certain maximum amount. For example 5 per cent of the base issue size.
The corporate bond market has evolved gradually over time due to the various measures taken by Sebi. The total primary issuance has increased from Rs 1.18 lakh crore in 2007-08 to Rs 4.92 lakh crore in 2015-16, while for the current fiscal (till November, 2016) it is Rs 4.43 lakh crore.