The shares of these companies are now allowed an upward or downward movement of a maximum of 20 per cent in a day, BSE said in a circular. The changes would be effective from tomorrow, it added.
Besides, other scrips that would attract a circuit filter of 20 per cent are Shipping Corporation Of India, Bharat Electronics, Container Corporation of India, National Aluminium Company.
The exchanges set the circuit filter of a stock as partof their surveillance mechanism in order avoid to excessive volatility in the particular share price.

