Interpreting option pricing

I’m noticing in BankNifty Call Options that while 18900 and above strike prices have options priced with approximately Rs. 50/- difference between consecutive strike prices, (Index at 18700), but while 18900 CE is at approximately around 400, 18800 CE is around 1700.(logically should be between 450 and 470) Is there any reason behind such a huge price difference between consecutive CEs?

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I think this may be because you may be seeing illiquid options. In such options, trades seldom take place and the LTP may not be a price you can use for reference.

http://nseindia.com/live_market/dynaContent/live_watch/option_chain/optionKeys.jsp?symbolCode=-9999&symbol=BANKNIFTY&symbol=BANKNIFTY&instrument=-&date=-&segmentLink=17&symbolCount=2&segmentLink=17
18800CE is at 648 and 18900 CE is at 580, where you see the information you posted.
Its not matching with your question.

During market hours. Not now

Wow, 8th wonder of the world! Pls do take a selfie whenever u come across the next wonder and post it as snapshot. Is it on NSE Or BSE?

@Vidya
Something could be wrong with your display or values.
It cannot be 1700.
Have u seen the OHLC data for the day? to see the high value of that option

Ure right. Mayb something with display. Cos during market hours it said 1700 as LTP and charts werent forming. But chart displayed after market hours on appropriate prices. Thanks for the suggestion