The BNF OI puzzle, what I think happened. This is post mortem analysis 😀

COi was going up like crazy since early March, positions were being created in far month ( go thru my previous tweets)

OI = net shorts = net longs. So informed traders were taking a huge position expecting a parabolic move ( we did not know whether up or down). As of now, my guess is that the whole position was a long position. Someone had the info of the rate cut
You can see that the positions were cut hugely on 1st April. What happened on 1st April ?

This happened 👇👇
If the rollback did not happen ( due to whatever reason), BNF would have gapped up by 1000-1500 points and the shorts would have been killed, and longs would have been laughing all the way to the bank. See the cut on 1st April
But since the rollback did happen, what we now had were trapped longs. that's why we are seeing any upmove getting sold as longs get rid of their positions. COI now is down to normal levels as you can see
My guess is there are still some longs trapped, so as long we do not close above 33600 chances are we will see one more spike and climax selling on the downside. There is a strong supply in the 33400-33600 zone. the 33600 figure is quantitative
@MyFnO @gautam_icma
End of day view :
This is what I am expecting. Will chance my bearish stance if we close > 33600
*change

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Ok here is the explanation. Grab a cup of coffee and read on. If you have not read/noticed this, you will see intraday options movement in a new light.


Say we have two options, one 50 delta ATM options and another 30 delta OTM option. Normally for a 100 point move, the ATM option will move 50 points and the OTM option will move 30 points. But in a high volatile environment, the OTM option will also move nearly 50 points

To understand why this happens, first understand why an ATM option is 50 delta. An ATM option has the probability of 50% of expiring as ITM. The price just has to close a rupee above the strike for the CE to be ITM and vice versa for PEs

Now think of a highly volatile day like today. If someone is asked where the BNF will close for the day or expiry, no one can answer. BNF can close freakin anywhere, That makes every option of an equal probability of being ITM. So all options have a 50% probability of being ITM

Hence, when a huge volatile move starts, all OTM options behave like ATM options. This phenomenon was first observed in the Black Monday crash of 1987 at Wall Street, which also gave rise to the volatility skew/smirk

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