STT Trap – Options Expiry – NSE BSE MCX-SX
Traders, Why do options trade at lesser than theoretical value on the last day of expiry? Why is it important to square off ITM (in the money) options rather than let them expire on the expiry day? Not knowing the answer to the above questions can cause a potential loss and hence the reason for writing this blog. I am assuming that all of you reading understand the basics of option trading. Many of us would have had the following 2 questions or faced similar scenarios at some point of our trading career Nifty is trading at 5950 and today is the day of expiry. At around 2:00 PM, Nifty 5900 calls and 6000 puts are trading at around Rs 45. Ideally it should be at least 50, so why? I had bought Nifty 5800 calls and Nifty closed at 5803 on expiry day. I could have sold it on the exchange but thought otherwise and let it expire assuming I will get back at least Rs 225 (Rs 3 x 75)/lot. To my shock, the contract note sent to me by the broker in the evening showed a debit of Rs 200