What if there is no buyer for an cash secured PE option ?

Suppose we sell a Put option, example say a strike of ITC 420 PE at a premium of INR 5, Lot size 1 expiring on 1 month i.e.) 29 FEB 2023 and trade.
On the day of expiry 29 FEB 2023 there is no buyer but the underlying ITC share price reached 420 what happens ?
Broker will buy the shares and provide delivery of shares to me ? where does the broker buy from cash market or auction market ?

Another scenario:
suppose if the underlying ITC share price reaches 440, i will be allowed to retain the premium of 5 ?

This strategy of cash secured put is recommended when we are ready to take the delivery of shares by paying the price so i would like to understand the low liquidity situation.

As ITC 420 PE expiring at 420 it will be ATM option which is cash settled so you will receive the premium which is 5 rupees.

In this case also the option expires worthless (OTM). You will receive 5 rupees premium.

Physical delivery happens only in case of ITM stock options.

For more visit the following links Varsity and Physical delivery

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