"Keeping in view the recent increase in the intra-day and intra-settlement volatility in share prices and with to ensure safety of the market, we have initiated the move to impose margins on purchase positions," said RC Mathur, executive director of BSE.

Beginning from June 23, the exchange has decided to impose a daily margin of 15 per cent on purchase transactions in the 150 specified group stocks, instead of the 10 per cent slapped earlier.

Further, the exchange has also decided to slap a 15 per cent margin on all outstanding purchase transactions in the specified group stocks, carried forward from settlement ending June 26 to settlement beginning June 29.Currently, these carryforward purchase positions attract a margin of 10 per cent.

Earlier, the Sebi's initiative to ban shortsales and reduce it to a shorter duration of one-day period, had led to an imbalance in the market, which saw the long positions at a high of Rs 1,000 crore and the short positions at a low of Rs 250 crore. In view of the imbalance created in the market, the BSE has further decided to allow the brokers to carry forward an aggregate position of Rs 20 crore consisting of teji badla, share badla and mandi badla from one settlement to another as at present. However, the purchase or sale positions carried forward from one settlement to another would not be allowed to exceed the Rs 15 crore mark, within the overall ceiling of Rs 20 crore.

The above limits specified by the exchange would come into force from June 26. The exchange has also decided to impose a limit of Rs 5 crore on carryforward business in any individual scrip within the overall limit of Rs 20 crore. This step would be implemented from July 6. It should be recalled that the BSE on June 13 decided to impose a 50 per cent margin on teji badlapositions.