Turning Complex Derivative Data into Clear Market Insights
NSE & BSE Indices Futures and Options Open Interest Volume Analysis for 18/09/2026
Table of Contents
Executing our daily Open Interest Volume Analysis, the critical institutional signal today is the decisive forward-curve migration: while front-month contracts across NIFTY and BANKNIFTY saw systematic profit-taking on existing short positions, October futures absorbed aggressive, high-conviction “Fresh Longs”—headlined by a +10.42% OI expansion in NIFTY on a 38% volume spike.
The options landscape confirms this shift toward positive gamma: NIFTY’s weekly Put-Call Ratio expanded from 0.995 to 1.121 as put writers anchored an active liquidity cushion at 23,300, BANKNIFTY’s monthly PCR rebounded aggressively toward parity at 0.969, and SENSEX locked into an extraordinary high-stakes straddle pin with peak additions on both wings clustering dead on the 74,500 strike.
Rather than indiscriminate buying, institutional desks are setting up a structured floor into monthly expiry week, absorbing supply on intraday dips while call writers defend tactical overhead triggers. Let’s break down the strike inventory, basis dynamics, and actionable setups so your desk executes with pinpoint precision on Monday!
NSE & BSE F&O Market Signals
NIFTY Future analysis
NIFTY Spot closed at: 23346.4 (0.326%)
Combined = September + October + November
Combined Fut Open Interest Change: 0.70%
Combined Fut Volume Change: -11.91%
Combined Fut Open Interest Analysis: Fresh Long
Rollover: 22% Previous 21%
NIFTY SEPTEMBER Future closed at: 23378.5 (0.193%)
Sep Fut Premium 32.1 (Decreased by -30.7 points)
Sep Fut Open Interest Change: -1.39%
Sep Fut Volume Change: -21.97%
Sep Fut Open Interest Analysis: Short Covering
NIFTY OCTOBER Future closed at: 23480.3 (0.163%)
Oct Fut Premium 133.9 (Decreased by -37.5 points)
Oct Fut Open Interest Change: 10.42%
Oct Fut Volume Change: 38.14%
Oct Fut Open Interest Analysis: Fresh Long
NIFTY Weekly Expiry (22/09/2026) Option Analysis
Put-Call Ratio (Open Interest): 1.121 (Increased from 0.995)
Put-Call Ratio (Volume): 1.001
Max Pain Level: 23350
Maximum CALL Open Interest: 24000
Maximum PUT Open Interest: 23300
Highest CALL Addition: 23400
Highest PUT Addition: 23300
NIFTY Monthly Expiry (29/09/2026) Option Analysis
Put-Call Ratio (Open Interest): 0.982 (Increased from 0.954)
Put-Call Ratio (Volume): 0.847
Max Pain Level: 23800
Maximum CALL Open Interest: 24000
Maximum PUT Open Interest: 23000
Highest CALL Addition: 23300
Highest PUT Addition: 23300
BANKNIFTY Future Analysis
BANKNIFTY Spot closed at: 56358.7 (0.540%)
Combined = September + October + November
Combined Fut Open Interest Change: -2.05%
Combined Fut Volume Change: -11.64%
Combined Fut Open Interest Analysis: Short Covering
Rollover: 16% Previous 15%
BANKNIFTY SEPTEMBER Future closed at: 56527 (0.385%)
Sep Fut Premium 168.3 (Decreased by -85.95 points)
Sep Fut Open Interest Change: -3.3%
Sep Fut Volume Change: -11.4%
Sep Fut Open Interest Analysis: Short Covering
BANKNIFTY OCTOBER Future closed at: 56805.8 (0.373%)
Oct Fut Premium 447.1 (Decreased by -91.75 points)
Oct Fut Open Interest Change: 3.96%
Oct Fut Volume Change: -8.47%
Oct Fut Open Interest Analysis: Fresh Long
BANKNIFTY Monthly Expiry (29/09/2026) Option Analysis
Put-Call Ratio (Open Interest): 0.969 (Increased from 0.826)
Put-Call Ratio (Volume): 0.918
Max Pain Level: 57200
Maximum CALL Open Interest: 58000
Maximum PUT Open Interest: 57500
Highest CALL Addition: 58500
Highest PUT Addition: 55500
MIDCPNIFTY Future Analysis
MIDCPNIFTY Spot closed at: 14500.75 (0.547%)
Combined = September + October + November
Combined Fut Open Interest Change: -1.57%
Combined Fut Volume Change: 2.70%
Combined Fut Open Interest Analysis: Short Covering
Rollover: 5% Previous 5%
MIDCPNIFTY SEPTEMBER Future closed at: 14524.4 (0.593%)
Sep Fut Premium 23.65 (Increased by 6.7 points)
Sep Fut Open Interest Change: -1.62%
Sep Fut Volume Change: 9.40%
Sep Fut Open Interest Analysis: Short Covering
MIDCPNIFTY OCTOBER Future closed at: 14582.2 (0.771%)
Oct Fut Premium 81.45 (Increased by 32.6 points)
Oct Fut Open Interest Change: -3.29%
Oct Fut Volume Change: -35.60%
Oct Fut Open Interest Analysis: Short Covering
MIDCPNIFTY Monthly Expiry (29/09/2026) Option Analysis
Put-Call Ratio (Open Interest): 0.959 (Increased from 0.959)
Put-Call Ratio (Volume): 1.332
Max Pain Level: 14525
Maximum CALL Open Interest: 15000
Maximum PUT Open Interest: 14000
Highest CALL Addition: 15500
Highest PUT Addition: 14200
SENSEX Monthly Expiry (24/09/2026) Future
SENSEX Spot closed at: 74,294.96 (-0.026%)
SENSEX Monthly Future closed at: 74,659.15 (0.147%)
Premium: 364.19 (Increased by 128.93 points)
Open Interest Change: -0.19%
Volume Change: -68.52%
Open Interest Analysis: Short Covering
SENSEX Weekly Expiry (24/09/2026) Option Analysis
Put-Call Ratio (OI): 1.225 (Increased from 1.171)
Put-Call Ratio (Volume): 1.042
Max Pain Level: 74600
Maximum CALL OI: 74500
Maximum PUT OI: 74500
Highest CALL Addition: 74500
Highest PUT Addition: 74500
FII & DII Cash Market Activity
FIIs Net BUY: ₹ 599.54 Cr.
DIIs Net BUY: ₹ 1,019.69 Cr.
FII Derivatives Activity
| FII Trading Stats | 18.09.26 | 17.09.26 | 16.09.26 |
| FII Cash (Provisional Data) | 599.54 | -3,208.76 | -2,032.61 |
| Index Future Open Interest Long Ratio | 12.57% | 12.35% | 12.39% |
| Index Future Volume Long Ratio | 54.58% | 44.21% | 56.78% |
| Call Option Open Interest Long Ratio | 41.87% | 41.02% | 40.30% |
| Call Option Volume Long Ratio | 50.14% | 50.05% | 50.27% |
| Put Option Open Interest Long Ratio | 66.02% | 67.40% | 67.14% |
| Put Option Volume Long Ratio | 50.16% | 50.31% | 48.91% |
| Stock Future Open Interest Long Ratio | 53.91% | 54.22% | 54.21% |
| Stock Future Volume Long Ratio | 46.36% | 50.39% | 54.14% |
| Index Futures | Fresh Long | Fresh Short | Fresh Long |
| Index Options | Fresh Long | Fresh Long | Fresh Short |
| Nifty Futures | Fresh Long | Fresh Short | Fresh Long |
| Nifty Options | Fresh Long | Fresh Long | Fresh Short |
| BankNifty Futures | Short Covering | Fresh Short | Short Covering |
| BankNifty Options | Fresh Short | Fresh Short | Fresh Short |
| FinNifty Futures | Short Covering | Fresh Short | Fresh Long |
| FinNifty Options | Fresh Long | Fresh Long | Fresh Long |
| MidcpNifty Futures | Short Covering | Fresh Short | Fresh Short |
| MidcpNifty Options | Short Covering | Fresh Long | Fresh Short |
| NiftyNxt50 Futures | Fresh Short | Fresh Short | Fresh Long |
| NiftyNxt50 Options | Long Covering | Fresh Long | Fresh Long |
| Stock Futures | Fresh Short | Fresh Long | Fresh Long |
| Stock Options | Fresh Long | Fresh Short | Fresh Short |
NSE & BSE Option market Trends : Options Insights
SENSEX weekly Expiry (24/09/2026)
The SENSEX index closed at 74294.96. The SENSEX weekly expiry for SEPTEMBER 24, 2026 has revealed key trends in open interest. The current Put/Call Ratio is at 1.225 against previous 1.171. The 74500PE option holds the maximum open interest, followed by the 74500CE and 76000CE options. Market participants have shown increased interest with significant open interest additions in the 74500PE option, with open interest additions also seen in the 74500CE and 76000CE options. On the other hand, open interest reductions were prominent in the 72200PE, 69100PE
| SENSEX | Weekly | Expiry: | 24-09-2026 |
| Index Spot | PCR OI | Prev PCR OI | PCR VOL |
| 74294.96 | 1.225 | 1.171 | 1.042 |
| Total Open Interest Change in all CALLs & PUTs: | |||
| Current | Prior | Net Ch | |
| CALL: | 94,97,580 | 40,39,360 | 54,58,220 |
| PUT: | 1,16,39,140 | 47,28,460 | 69,10,680 |
| Top CALL Open Interest: | |||
| Strike | OI | OI Change | Volume |
| 74500 | 8,46,060 | 4,75,620 | 1,91,52,840 |
| 76000 | 7,77,320 | 4,37,340 | 80,08,740 |
| Top CALL Open Interest addition: | |||
| Strike | OI | OI Change | Volume |
| 74500 | 8,46,060 | 4,75,620 | 1,91,52,840 |
| 76000 | 7,77,320 | 4,37,340 | 80,08,740 |
| Top CALL Open Interest reduction: | |||
| Strike | OI | OI Change | Volume |
| 83600 | 40 | -40 | 4,340 |
| 85100 | – | – | – |
| Top CALL Volume: | |||
| Strike | OI | OI Change | Volume |
| 74500 | 8,46,060 | 4,75,620 | 1,91,52,840 |
| 74600 | 3,19,140 | 2,00,060 | 1,19,53,380 |
| Top PUT Open Interest: | |||
| Strike | OI | OI Change | Volume |
| 74500 | 10,09,000 | 6,67,700 | 2,19,63,180 |
| 68000 | 5,51,700 | 1,83,040 | 8,41,340 |
| Top PUT Open Interest addition: | |||
| Strike | OI | OI Change | Volume |
| 74500 | 10,09,000 | 6,67,700 | 2,19,63,180 |
| 74600 | 4,82,820 | 3,99,460 | 1,12,71,200 |
| Top PUT Open Interest reduction: | |||
| Strike | OI | OI Change | Volume |
| 72200 | 98,480 | -27,300 | 10,01,240 |
| 69100 | 9,380 | -1,660 | 87,180 |
| Top PUT Volume: | |||
| Strike | OI | OI Change | Volume |
| 74500 | 10,09,000 | 6,67,700 | 2,19,63,180 |
| 74400 | 4,61,400 | 2,82,800 | 1,23,05,080 |
NIFTY Weekly Expiry (22/09/2026)
The NIFTY index closed at 23346.4. The NIFTY weekly expiry for SEPTEMBER 22, 2026 has revealed key trends in open interest. The current Put/Call Ratio is at 1.121 against previous 0.995. The 23300PE option holds the maximum open interest, followed by the 24000CE and 23000PE options. Market participants have shown increased interest with significant open interest additions in the 23300PE option, with open interest additions also seen in the 23350PE and 23400CE options. On the other hand, open interest reductions were prominent in the 21700PE, 23250CE
| NIFTY | Weekly | Expiry: | 22-09-2026 |
| Index Spot | PCR OI | Prev PCR OI | PCR VOL |
| 23,346.40 | 1.121 | 0.995 | 1.001 |
| Total Open Interest Change in all CALLs & PUTs: | |||
| Current | Prior | Net Ch | |
| CALL: | 15,91,56,855 | 14,74,35,210 | 1,17,21,645 |
| PUT: | 17,84,63,805 | 14,67,32,300 | 3,17,31,505 |
| Top CALL Open Interest: | |||
| Strike | OI | OI Change | Volume |
| 24,000 | 1,15,58,560 | 12,48,715 | 9,13,736 |
| 24,500 | 1,00,50,300 | -3,99,685 | 5,00,022 |
| Top CALL Open Interest addition: | |||
| Strike | OI | OI Change | Volume |
| 23,400 | 87,68,240 | 22,45,100 | 48,84,019 |
| 23,700 | 94,95,720 | 19,34,465 | 13,11,724 |
| Top CALL Open Interest reduction: | |||
| Strike | OI | OI Change | Volume |
| 23,250 | 18,11,745 | -12,72,635 | 14,63,587 |
| 23,900 | 58,44,280 | -9,60,440 | 7,33,000 |
| Top CALL Volume: | |||
| Strike | OI | OI Change | Volume |
| 23,300 | 74,19,685 | 8,15,165 | 56,28,311 |
| 23,350 | 49,55,600 | 14,73,875 | 52,97,934 |
| Top PUT Open Interest: | |||
| Strike | OI | OI Change | Volume |
| 23,300 | 1,26,86,570 | 58,93,550 | 70,89,453 |
| 23,000 | 1,09,94,165 | 13,41,470 | 19,59,567 |
| Top PUT Open Interest addition: | |||
| Strike | OI | OI Change | Volume |
| 23,300 | 1,26,86,570 | 58,93,550 | 70,89,453 |
| 23,350 | 51,43,060 | 35,57,385 | 40,33,979 |
| Top PUT Open Interest reduction: | |||
| Strike | OI | OI Change | Volume |
| 21,700 | 28,73,455 | -19,19,255 | 1,62,373 |
| 21,900 | 19,21,465 | -6,82,500 | 1,88,155 |
| Top PUT Volume: | |||
| Strike | OI | OI Change | Volume |
| 23,300 | 1,26,86,570 | 58,93,550 | 70,89,453 |
| 23,350 | 51,43,060 | 35,57,385 | 40,33,979 |
NIFTY Monthly Expiry (29/09/2026)
The NIFTY index closed at 23346.4. The NIFTY monthly expiry for SEPTEMBER 29, 2026 has revealed key trends in open interest. The current Put/Call Ratio is at 0.982 against previous 0.954. The 24000CE option holds the maximum open interest, followed by the 23000PE and 24500CE options. Market participants have shown increased interest with significant open interest additions in the 23300PE option, with open interest additions also seen in the 23300CE and 23900CE options. On the other hand, open interest reductions were prominent in the 24300CE, 24500CE
| NIFTY | Monthly | Expiry: | 29-09-2026 |
| Index Spot | PCR OI | Prev PCR OI | PCR VOL |
| 23,346.40 | 0.982 | 0.954 | 0.847 |
| Total Open Interest Change in all CALLs & PUTs: | |||
| Current | Prior | Net Ch | |
| CALL: | 9,37,99,180 | 8,82,47,140 | 55,52,040 |
| PUT: | 9,21,33,100 | 8,41,57,430 | 79,75,670 |
| Top CALL Open Interest: | |||
| Strike | OI | OI Change | Volume |
| 24,000 | 1,03,81,280 | 4,67,090 | 1,70,066 |
| 24,500 | 54,96,465 | -1,47,030 | 57,828 |
| Top CALL Open Interest addition: | |||
| Strike | OI | OI Change | Volume |
| 23,300 | 44,43,335 | 9,21,440 | 1,90,058 |
| 23,900 | 42,74,595 | 8,45,065 | 1,24,265 |
| Top CALL Open Interest reduction: | |||
| Strike | OI | OI Change | Volume |
| 24,300 | 44,95,985 | -2,99,065 | 47,947 |
| 24,500 | 54,96,465 | -1,47,030 | 57,828 |
| Top CALL Volume: | |||
| Strike | OI | OI Change | Volume |
| 23,300 | 44,43,335 | 9,21,440 | 1,90,058 |
| 24,000 | 1,03,81,280 | 4,67,090 | 1,70,066 |
| Top PUT Open Interest: | |||
| Strike | OI | OI Change | Volume |
| 23,000 | 72,45,435 | 2,56,465 | 1,58,997 |
| 24,000 | 54,34,790 | -1,12,060 | 11,255 |
| Top PUT Open Interest addition: | |||
| Strike | OI | OI Change | Volume |
| 23,300 | 53,37,020 | 10,89,725 | 1,84,046 |
| 21,000 | 36,92,260 | 7,52,050 | 23,939 |
| Top PUT Open Interest reduction: | |||
| Strike | OI | OI Change | Volume |
| 23,200 | 31,50,420 | -1,17,845 | 86,642 |
| 24,000 | 54,34,790 | -1,12,060 | 11,255 |
| Top PUT Volume: | |||
| Strike | OI | OI Change | Volume |
| 23,300 | 53,37,020 | 10,89,725 | 1,84,046 |
| 23,000 | 72,45,435 | 2,56,465 | 1,58,997 |
BANKNIFTY Monthly Expiry (29/09/2026)
The BANKNIFTY index closed at 56358.7. The BANKNIFTY monthly expiry for SEPTEMBER 29, 2026 has revealed key trends in open interest. The current Put/Call Ratio is at 0.969 against previous 0.826. The 58000CE option holds the maximum open interest, followed by the 57500PE and 57500CE options. Market participants have shown increased interest with significant open interest additions in the 55500PE option, with open interest additions also seen in the 54500PE and 56500PE options. On the other hand, open interest reductions were prominent in the 57500CE, 58000CE
| BANKNIFTY | Monthly | Expiry: | 29-09-2026 |
| Index Spot | PCR OI | Prev PCR OI | PCR VOL |
| 56,358.70 | 0.969 | 0.826 | 0.918 |
| Total Open Interest Change in all CALLs & PUTs: | |||
| Current | Prior | Net Ch | |
| CALL: | 1,61,63,250 | 1,77,68,220 | -16,04,970 |
| PUT: | 1,56,63,750 | 1,46,82,300 | 9,81,450 |
| Top CALL Open Interest: | |||
| Strike | OI | OI Change | Volume |
| 58,000 | 16,33,350 | -96,630 | 76,370 |
| 57,500 | 14,24,400 | -7,09,770 | 1,07,073 |
| Top CALL Open Interest addition: | |||
| Strike | OI | OI Change | Volume |
| 58,500 | 8,93,610 | 31,020 | 37,886 |
| 55,900 | 74,400 | 17,760 | 7,947 |
| Top CALL Open Interest reduction: | |||
| Strike | OI | OI Change | Volume |
| 57,500 | 14,24,400 | -7,09,770 | 1,07,073 |
| 58,000 | 16,33,350 | -96,630 | 76,370 |
| Top CALL Volume: | |||
| Strike | OI | OI Change | Volume |
| 56,500 | 6,27,270 | -19,530 | 1,46,729 |
| 57,500 | 14,24,400 | -7,09,770 | 1,07,073 |
| Top PUT Open Interest: | |||
| Strike | OI | OI Change | Volume |
| 57,500 | 15,08,730 | -72,870 | 5,947 |
| 54,000 | 10,06,200 | 57,990 | 52,302 |
| Top PUT Open Interest addition: | |||
| Strike | OI | OI Change | Volume |
| 55,500 | 5,83,350 | 1,42,560 | 51,381 |
| 54,500 | 4,36,620 | 1,27,200 | 44,654 |
| Top PUT Open Interest reduction: | |||
| Strike | OI | OI Change | Volume |
| 57,500 | 15,08,730 | -72,870 | 5,947 |
| 50,500 | 46,830 | -38,700 | 5,015 |
| Top PUT Volume: | |||
| Strike | OI | OI Change | Volume |
| 56,000 | 9,41,550 | 1,00,950 | 1,15,607 |
| 56,300 | 3,12,360 | 90,300 | 1,06,965 |
MIDCPNIFTY Monthly Expiry (29/09/2026)
The MIDCPNIFTY index closed at 14500.75. The MIDCPNIFTY monthly expiry for SEPTEMBER 29, 2026, 2025 has revealed key trends in open interest. The current Put/Call Ratio is at 0.959 against previous 0.959. The 15000CE option holds the maximum open interest, followed by the 14000PE and 14500PE options. Market participants have shown increased interest with significant open interest additions in the 15500CE option, with open interest additions also seen in the 14200PE and 14500PE options. On the other hand, open interest reductions were prominent in the 74500CE, 74600CE
| MIDCPNIFTY | Monthly | Expiry: | 29-09-2026 |
| Index Spot | PCR OI | Prev PCR OI | PCR VOL |
| 14,500.75 | 0.959 | 0.959 | 1.332 |
| Total Open Interest Change in all CALLs & PUTs: | |||
| Current | Prior | Net Ch | |
| CALL: | 81,00,840 | 82,06,800 | -1,05,960 |
| PUT: | 77,69,280 | 78,67,680 | -98,400 |
| Top CALL Open Interest: | |||
| Strike | OI | OI Change | Volume |
| 15,000 | 10,86,120 | 40,320 | 7,593 |
| 14,500 | 6,06,960 | 8,040 | 18,096 |
| Top CALL Open Interest addition: | |||
| Strike | OI | OI Change | Volume |
| 15,500 | 5,54,160 | 82,920 | 2,734 |
| 15,000 | 10,86,120 | 40,320 | 7,593 |
| Top CALL Open Interest reduction: | |||
| Strike | OI | OI Change | Volume |
| 14,400 | 3,89,160 | -65,760 | 6,155 |
| 14,300 | 2,76,360 | -57,240 | 1,509 |
| Top CALL Volume: | |||
| Strike | OI | OI Change | Volume |
| 14,500 | 6,06,960 | 8,040 | 18,096 |
| 14,600 | 5,08,560 | -4,200 | 8,581 |
| Top PUT Open Interest: | |||
| Strike | OI | OI Change | Volume |
| 14,000 | 9,92,400 | -31,200 | 14,701 |
| 14,500 | 7,22,400 | 66,720 | 18,351 |
| Top PUT Open Interest addition: | |||
| Strike | OI | OI Change | Volume |
| 14,200 | 4,95,480 | 70,920 | 6,994 |
| 14,500 | 7,22,400 | 66,720 | 18,351 |
| Top PUT Open Interest reduction: | |||
| Strike | OI | OI Change | Volume |
| 13,800 | 6,25,920 | -2,65,920 | 8,053 |
| 13,000 | 2,01,480 | -51,480 | 2,355 |
| Top PUT Volume: | |||
| Strike | OI | OI Change | Volume |
| 14,400 | 4,80,240 | 37,680 | 20,731 |
| 14,500 | 7,22,400 | 66,720 | 18,351 |
Conclusion: What the NSE & BSE Indices Futures and Options Open Interest Volume Analysis Tells Us
To synthesize today’s Open Interest Volume Analysis, Dalal Street has officially transitioned from negative gamma vulnerability into an active inventory-accumulation regime. With weekly put cushions expanding across benchmark indices, execution favors buying confirmed retests of established put bases while taking disciplined profits into major call-writing nodes:
NIFTY (Structural Forward Accumulation / Tight 23,300–23,400 Straddle): While front-month September saw routine Short Covering (-1.39% OI) with premium cooling to 32.1 points, October futures absorbed heavy institutional capital, surging +10.42% OI in genuine Fresh Longs alongside expanding volume (+38.14%). In the weekly chain (22/09 expiry), PCR jumped to 1.121, with put writers aggressively locking down 23,300 (Maximum Put OI and Highest Put Addition) against active call resistance at 23,400 (Highest Call Addition), centering Max Pain right at 23,350. Actionable Feedback: The 23,300–23,320 pocket is our primary structural floor. Execute a disciplined “Buy on Dips” strategy; enter long positions on retests of 23,310–23,330 with a tight stop-loss placed below 23,280. Target 23,400 first, where a sustained 15-minute spot close above 23,420 will trigger a mechanical delta squeeze toward 23,500.
BANKNIFTY (Relief Short Covering & Forward Long Absorption): Following yesterday’s heavy forward shorting, banking heavyweights saw bears rapidly cover front-month exposure (-3.3% OI in September), while October futures absorbed +3.96% OI in Fresh Longs. Crucially, the monthly options chain (29/09) registered aggressive put accumulation, driving the PCR from 0.826 to 0.969, while call writers retreated their highest additions to the distant 58,500 strike. Actionable Feedback: The immediate downside panic is contained. Long setups offer favorable asymmetry on pullbacks into 56,200–56,350, with risk strictly defined below 56,050. Look for an institutional drift toward 56,800 and the 57,200 Max Pain target, trimming long exposure as spot approaches the 57,500 open interest wall.
MIDCPNIFTY (Dual-Tenor Short Covering Above 14,500): Midcaps reclaimed the psychological 14,500 mark (+0.547% spot), but the underlying futures activity revealed tactical profit-booking rather than fresh aggressive accumulation, with both September (-1.62% OI) and October (-3.29% OI) posting clean Short Covering alongside healthy basis expansion (+32.6 pts in October). Option writers responded by lifting call additions all the way to 15,500, setting Max Pain at 14,525. Actionable Feedback: The trend has stabilized, but lack of fresh open interest demands trailing stops. Accumulate long exposure only on healthy pullbacks toward 14,460–14,480 with an invalidation stop-loss below 14,420, targeting 14,580 and 14,650.
SENSEX (The 74,500 Absolute Pin Battle): SENSEX futures saw premium expand by +128.93 points on mild short covering (-0.19% OI), while the weekly options chain (24/09 expiry) displayed textbook institutional pinning behavior. The PCR climbed to 1.225, with the 74,500 strike functioning as the master epicenter—simultaneously holding the Maximum Call OI, Maximum Put OI, Highest Call Addition, and Highest Put Addition. Actionable Feedback: The 74,500 strike is a mathematical magnet heading into expiry week. Fade extreme intraday deviations away from this node: look to buy dips near 74,200–74,300 with stops below 74,050, and sell overextended spikes near 74,750–74,850 with stops above 74,950, targeting mean-reversion back to the 74,500–74,600 Max Pain equilibrium.
Q: What is the difference between Open Interest (OI) and Volume in F&O trading?
A: Volume counts every single contract traded during the session, including quick intraday round trips. Open Interest (OI), on the other hand, measures the total number of outstanding contracts that have not yet been closed or exercised. In short, volume tells you how much trading activity happened today, while OI tells you how much capital is actually committed and holding positions overnight.
Q: How do you identify Long Buildup vs. Short Covering using price and OI?
A: This is the core of daily institutional analysis. If the Nifty or Bank Nifty price is rising and OI is also increasing, it is a “Long Buildup,” meaning fresh buyers are entering the market with conviction. If the price is rising but OI is falling, it is “Short Covering”—meaning existing short sellers are just buying to close their losing positions. A short-covering rally often fades quickly, while a long buildup indicates sustainable strength.
Q: What does it mean when Open Interest increases but the index price falls?
A: When the price is falling while Open Interest is rising, it triggers a “Short Buildup” signal. This is a strong bearish indicator because it means fresh sellers are aggressively entering the market and creating new short positions. The deeper the short buildup, the more conviction institutional sellers have that the market will continue to drop.
Q: How can I find Support and Resistance levels using Nifty or Bank Nifty Open Interest?
A: Options traders look at the strike prices with the highest concentration of open interest. The strike with the Highest Call OI typically acts as a strong overhead resistance zone because institutional call writers (option sellers) will defend that level via hedging. Conversely, the strike with the Highest Put OI acts as a structural support floor.
Q: How does the Put-Call Ratio (PCR) work alongside Open Interest analysis?
A: Looking at an OI-based PCR adds crucial context to market sentiment. A PCR reading between 0.9 and 1.1 indicates balanced positioning. If the PCR drops significantly (e.g., below 0.7), it signals aggressive call writing and heavy resistance overhead. If PCR rises well above 1.0, it shows strong put writing and a solid support base, indicating market makers are actively defending the downside.
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BSE Derivatives Raw Data
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