Sebi, along with the bourses which act as front-line regulators, are looking into possible links of a rogue trader who has been barred from the capital markets but could still be trading through front entities, a senior official said.
Suspecting a foul play, the authorities got into the act immediately after a massive sell-off was witnessed around the noon time in shares of over a dozen companies.
However, some of the affected shares managed to recover the lost ground, fully or partly, in the afternoon trade.
Sources said that most of these firms have a significant amount of pledged promoter shares and there are indications about margin-calls being triggered on these counters.
There is also a suspicion that deliberate attempts could have been made to pull down the shares through spread of wrong rumours among the traders about these stocks, the official said, while adding that the exact position would be known only after further investigations.
BSE Mid Cap index declined 1.20 per cent to close at 6,529.53 points while BSE Small Cap shed 1.36 per cent to end the day at 6,475.65 points. The benchmark 30-share Sensex ended flat at 19,331.69 points.
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