Nifty Weekly Expiry: Nifty Slips Below 22,900; Call OI Addition Over 3x Put OI

The selling pressure in Indian equities gathered pace during Monday's session on October 19, with the Nifty 50 extending its decline on the weekly options expiry day. After witnessing sharp fluctuations in early trade, the index breached the previous session's low and continued to lose ground as the day progressed.

At 1:29 PM, Nifty was trading at 22,870, down 275 points or 1.19 per cent. The index had also slipped below the psychologically important 22,900 mark, which had attracted substantial put open interest earlier in the session.

Meanwhile, India VIX climbed 6 per cent to 14.91, indicating rising expectations of volatility amid the sustained decline.

The weakness in the underlying index was accompanied by considerable changes in the derivatives market. Call open interest additions gathered pace, the Put-Call Ratio (PCR) dropped below 1, and the maximum pain level shifted lower. Together, these developments suggest that the options positioning has become increasingly bearish compared with the opening hours of trade.

Derivatives Data Reflects Intensifying Selling Pressure

The Nifty options chain has undergone a noticeable change since the morning session.

Earlier in the day, put open interest exceeded call open interest, with the PCR standing at 1.07. However, the continued decline in Nifty was accompanied by a sharp increase in call positions, reversing the earlier open interest distribution.
According to the options data recorded around 1:17–1:18 PM, total call open interest reached 36.20 crore contracts, while total put open interest stood at 29.58 crore contracts.

More importantly, the change in open interest highlights the extent of fresh positioning on the call side. Call OI additions stood at 18.39 crore contracts, substantially higher than the 6.02 crore contracts added on the put side.

The larger increase in call open interest during a falling market is consistent with aggressive call writing, suggesting that market participants expect recovery attempts to face resistance.

Meanwhile, the PCR declined from 1.07 to 0.81, reflecting the growing dominance of call open interest over put open interest.
Although a PCR below 1 does not independently confirm a bearish trend, its decline alongside weakening prices and substantial call additions supports the cautious reading of the market.

The sustainability of this positioning will depend on whether call writers continue to hold their positions or begin unwinding them during recovery attempts.

Maximum Pain Drops 150 Points to 22,950

Another development in the expiry session is the downward shift in the maximum pain level.

During the morning session, maximum pain was positioned at 23,100. However, changes in outstanding options positions have brought the level down to 22,950.

With Nifty trading at 22,870, the index has moved below this revised maximum pain level, which now serves as an important overhead reference.

A recovery towards 22,950 would need to be supported by sustained buying interest and an improvement in the prevailing options positioning.

However, the maximum pain level should not be interpreted as a price target. It represents a theoretical options settlement reference based on outstanding positions, and it can change as traders adjust their exposure.

The movement from 23,100 to 22,950 nevertheless highlights how significantly the derivatives structure has changed during the session.

Call OI Shifts Towards Lower Strikes, 23,000 Becomes Key Resistance

The call side of the options chain shows significant additions at the 22,950, 23,000 and 23,100 strikes.

Among these levels, 23,000 has witnessed the highest addition in open interest and also holds the largest concentration of outstanding call positions.

This is a considerable change from the morning session, when 23,200 had the highest call open interest concentration.
The shift towards lower call strikes suggests that overhead resistance has moved closer to the prevailing market price as Nifty declined.

With the index now trading below 22,900, the 22,950 strike represents an important hurdle during any intraday recovery.
A move above 22,950 could allow Nifty to test 23,000. However, the substantial call positioning at 23,000 may make it difficult for the index to sustain higher levels without meaningful call unwinding.

If Nifty manages to reclaim 23,000 and hold above it, short covering could support a recovery towards 23,100.
Until then, the concentration of call positions at these strikes suggests that rebounds could continue to encounter selling pressure.

Nifty Breaks Below the 22,900 Put OI Base

On the put side, fresh additions have been concentrated at the 22,800, 22,850 and 22,900 strikes.

The highest total put open interest is positioned at 22,900, making it a significant reference point in the options structure.
However, Nifty's decline to 22,870 indicates that the index has already breached this important strike.

Earlier in the session, 23,000 had attracted the highest put open interest. As the market weakened, the concentration shifted towards 22,900, while fresh additions emerged at still lower strikes.

This movement suggests that put-side positioning has adjusted to the decline in the underlying index.

With Nifty now below 22,900, the immediate focus shifts towards 22,850, where notable put additions have been recorded.
If selling pressure continues and the index fails to recover above 22,900, the decline could extend towards 22,850. A sustained break below this level may bring 22,800 into consideration.

Conversely, if Nifty reclaims 22,900 and manages to hold above it, the level could once again act as a near-term support reference, although the substantial call positioning at 22,950 may restrict the recovery.

The behaviour of put open interest at 22,900 and 22,850 will be particularly important, as continued unwinding could weaken the existing support structure.

Important Nifty Levels Ahead of Weekly Expiry

Based on the afternoon options data and prevailing market conditions, the following levels warrant attention.

Market Outlook: Downside Risk Persists Below 22,900

The afternoon session has seen a considerable deterioration in the Nifty's price structure, with the index extending its losses and slipping below the important 22,900 level.

The derivatives data reinforces the weakness. Call open interest additions of 18.39 crore contracts, a decline in PCR to 0.81 and a downward revision in maximum pain to 22,950 suggest that the market is facing stronger resistance at lower levels than earlier in the session.

The rise in India VIX to 14.91 also points towards increased volatility, which could result in further sharp movements as outstanding positions are adjusted before expiry.

On the downside, 22,850 has become the immediate support to monitor, followed by 22,800. If Nifty fails to hold these levels, the selling pressure could extend further, particularly if put positions begin to unwind.

On the upside, 22,900 is the first level the index needs to reclaim. A sustained recovery above this mark could open the possibility of a move towards 22,950.

However, with heavy call positions concentrated at 23,000, the broader recovery may remain restricted unless call writers begin reducing their exposure.

A move above 23,000, supported by sustained buying and call unwinding, would be required to ease the immediate bearish pressure and bring 23,100 back into focus.

For now, the near-term trend remains weak, with the index trading below an important put open interest strike and call positions accumulating at nearby overhead levels.

The immediate trading setup has shifted towards the 22,800–22,950 zone, with 23,000 remaining a stronger resistance beyond this range.

The ability of Nifty to recover above 22,900 or sustain above 22,850 will be important in determining the direction of the remaining expiry session. Traders will also need to follow changes in open interest, as support and resistance levels can shift quickly during periods of heightened volatility.