Icicibank option chain

Why it is like this ? Strike prices are very close. I know Due to bonus issue. but how these strikes arrived at ?

It is due to bonus only which happened in june, as we know at any point of time total 3 different consecutive month contacts will be available to trade hence we can notice this till august expiry as bonus happened in june. We can notice the strikes are evenly spaced for next expiry and thereafter. To mention for most corporate actions strike prices and lot sizes would be adjusted.

Maybe this will help. They have described the methodology.

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