Can you kindly elaborate why should there be an 'alarm'!! This in my opinion is the scenario every time a stock is included in FnO!!! There are quiet a few traders who trade basically in FnO to gain from there present holding. Maybe, such people are adding these stocks to their portfolio!!! Its just my speculation!
Would like to hear from you your further views. Thanks.
I tend to agree with Even Money that the stocks in F&O list carry different respect from trading community. And any change there, results into resuffling the underlying's holding.
Same is the case when a scrip is added /removed from Market Indices.
Some people do this reshuffling strategically keeping in mind their trading strategy but many people use this as an arbitrage opportunity.
Frankly speaking, the smart people would have already known few weeks/months about forthcoming changes in F&O list and would have taken the position already. It is the late comer who react to news are acting now. (even in smart money, there is dumb smart money)
Happy Trading