On expiry days, markets can exhibit sudden volatility even when Open Interest data suggests one sentiment, and option buyers should avoid trading near closing time due to theta decay, while option sellers can profit from short straddle strategies during high-volatility periods.
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Buyers Trapped… Sellers Enjoyed 🔥 | Decoding Market with OiPulse | 19 May 2026Added:
Hello traders, this is Raja here.
Welcome to another episode of decoding the market with OI pulse.
>> [music] >> Today is 19th May, which is Nifty's weekly expiry. The market opened flat and initially moved higher around 70 points. After that, suddenly the market dropped nearly 100 points in just two candles. If we check trending OI data at that time, it shows 5.9 crores on the call side and 7.9 crores on the put side, indicating a bullish sentiment.
But on the chart, we just saw a huge drop in Nifty. So, we have to wait for the next 15-minute trending OI data. And on the chart also, we need to see a clear direction first. So, in the next 15 minutes, the market again shoots 100 points upside by wiping out the entire previous drop. Now, in trending OI, both call OI and put OI become almost equal, making it a highly volatile market with no clear trend direction. If both side OI is equal, that means both side sellers have built positions. So, we have to wait for either one side to start covering the shorts to conclude a trend and follow the market direction.
On expiry days, we cannot predict these kinds of sudden moves. The only thing we can do is prepare ourselves by knowing that at any time, the market can make a sudden move on either side, and we should enter a trade only when both the data and the chart give us a clear trend and a proper trading setup. After that, Nifty again dropped nearly 80 points till 10:00. If we check trending OI at 10:00, the call OI is 9.5 crores and the put OI is 7.6 crores. Not a very strong bearish sentiment, but a moderate bearish sentiment with around two crores difference. Though we see bearishness in trending OI, we still cannot enter a put trade. Why? Because the super trend is below and view up is above making it a no trade zone as per my trade setup and the market is trading near the previous low where bulls already give strong support earlier despite the big red candle. So, we need to wait for the bears to break the super trend and the day's low along with a clear direction in trending OI. But again, the market moved higher and got rejected immediately after making a new high. Now it's clear that the market is stuck between these levels and we have to wait for any one of these levels to break.
Then only we can look for a trade entry, otherwise we may get stuck inside this range and the premium will erode faster because of expiry. If we check trending OI during this time, again the call OI reduced and the put OI increased with only minimal difference. So, we should wait until sellers give up on any one side, otherwise they will keep the market sideways and eat premiums from both calls and puts. As I said, Nifty stayed between the marked levels and the trending OI data also didn't change much, still hovering around just one crore difference. Now, at 2:45, Nifty finally broke the day's low. In trending OI, it shows 14 crores on the call side and 10 crores on the put side. A strong bearish sentiment, right? But still, we don't enter a put trade even if we get a pullback towards super trend or VWAP.
Why? Because the market is already heading towards closing time and also [clears throat] it is an expiry day. So, even if the market moves in our favor, the option premium may not increase much due to the theta effect. So, it is better not to take any trade from here.
Overall, it is a no trade day for us as an option buyer, but it was actually a great day for option sellers, especially traders who did short straddle. Can you see from 140 rupees the premium went all the way down to 32 rupees. So, if they entered anywhere before 1:00 p.m. and trailed their positions properly, they could have captured good points till the 2:45 breakout. Hope you like this video.
If you have any doubts or feedback about OIP pulse, comment below. We'll look into it. Subscribe to our channel and share this video with your trading friends. And I'll see you in another interesting analysis video. Thank you.
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