Sensex closing discrepancy

[Aditya_Gupta]

Is the adjusted closing price calculation changed or is still same, ie, 30 mins vwap.

Because, todays sensex closing cannot be justified. Check the charts.

For 24 mins sensex stayed around or below 76370 and in last 6 mins it went around 76400 but closing price is 76391. How?? When more than half of time it stayed below this level. I am attaching chart for reference.

[Patel_6]

Volume matters not time.

[Aditya_Gupta]

But volume is not showing. For index how to check volume?

[Patel_6]

Closing price of index = weighted avg of closing price of constitutes.

[Aditya_Gupta]

I have checked charts of top 10 constituents of sensex. Only reliance moved by 4 points and infosys by 10 points and others reamin stable or even decline. I dont think These two alone can affect closing price of sensex by around 20-25 points. Something is surely wrong

[Patel_6]

4 points in last 5 minutes? btw movement of 20-25 points is nothing as compare to 76000.

[BB789]

@Aditya_Gupta

volume is not showing

Zerodha charts won’t show. Bu main tradingview chart will show.

SENSEX Chart — BSE SENSEX Index — TradingView

[dtyxg]

Thought answering this would be simple ; But it took me solid more than an hour to answer with data

Created an extension in order to fetch the footprint chart from my trading view

Did not find the Constituents stocks exact weightage, reconstituted it using the Nippon mutual fund data.

@Aditya_Gupta ; Thank you , till date only had the superficial knowledge of how the calculation was done. But today I think I know.

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Calculating the Sensex Close — Full Reference

1. Formula for an Individual Security’s Closing Price

BSE’s official closing price is the volume-weighted average price (VWAP) of trades in the last 30 minutes of trading (15:00–15:30):

                    Σ ( Trade Priceₖ × Trade Quantityₖ )
Closing Price  =  ─────────────────────────────────────────      (over last 30 min)
                          Σ ( Trade Quantityₖ )

If there are no trades in that window, the last traded price of the day is used instead. This VWAP-based Closing Price is what feeds into the index formula below.

23-07-2026 TCS BSE — 15:00–15:29 IST Level-wise Order Flow from TradingView

Time IST	Price level	Buy volume	Sell volume	Total volume
15:00	2,238.50	0	2,750	2,750
15:00	2,239.00	1	0	1
15:00	2,239.50	76	31	107
15:00	2,240.00	73	5	78
15:00	2,240.50	40	11	51
15:00	2,241.00	2	9	11
15:00	2,241.50	11	7	18
15:01	2,238.50	0	401	401
15:01	2,239.00	6	1,407	1,413
15:01	2,239.50	23	6	29
15:01	2,240.00	0	5	5
15:01	2,240.50	118	12	130
15:01	2,241.00	81	0	81
15:02	2,239.50	0	18	18
15:02	2,240.00	10	160	170
15:02	2,240.50	6	0	6
15:02	2,241.00	8	4	12
15:02	2,241.50	14	2	16
15:03	2,240.00	87	93	180
15:03	2,240.50	32	20	52
15:03	2,241.00	109	114	223
15:04	2,240.00	5	191	196
15:04	2,240.50	1	217	218
15:04	2,241.00	98	79	177
15:04	2,241.50	99	1	100
15:05	2,240.00	12	152	164
15:05	2,240.50	2	6	8
15:05	2,241.00	19	7	26
15:05	2,241.50	26	28	54
15:05	2,242.00	9	6	15
15:06	2,237.00	0	2	2
15:06	2,237.50	171	576	747
15:06	2,238.00	2	64	66
15:06	2,238.50	122	68	190
15:06	2,239.00	812	326	1,138
15:06	2,239.50	30	0	30
15:06	2,240.00	10	31	41
15:06	2,240.50	0	57	57
15:06	2,241.00	41	8	49
15:07	2,238.00	0	5	5
15:07	2,238.50	114	13	127
15:07	2,239.00	69	120	189
15:07	2,239.50	96	2	98
15:07	2,240.00	15	1	16
15:07	2,240.50	4	2	6
15:07	2,241.00	2	0	2
15:08	2,241.00	15	0	15
15:08	2,241.50	5	0	5
15:08	2,242.00	2	0	2
15:08	2,242.50	37	12	49
15:08	2,243.00	152	27	179
15:08	2,243.50	288	7	295
15:08	2,244.00	351	6	357
15:08	2,244.50	315	0	315
15:09	2,244.00	1	4	5
15:09	2,244.50	772	17	789
15:09	2,245.00	52	40	92
15:09	2,245.50	53	104	157
15:09	2,246.00	3	3	6
15:09	2,246.50	399	6	405
15:09	2,247.00	152	0	152
15:10	2,241.50	0	1	1
15:10	2,242.00	0	1	1
15:10	2,242.50	2	55	57
15:10	2,243.00	17	13	30
15:10	2,243.50	47	199	246
15:10	2,244.00	4	106	110
15:10	2,244.50	1	0	1
15:10	2,245.00	4	11	15
15:11	2,241.50	1	0	1
15:11	2,242.00	3	4	7
15:11	2,242.50	27	36	63
15:11	2,243.00	17	19	36
15:11	2,243.50	6	14	20
15:11	2,244.00	0	1	1
15:12	2,242.00	5	21	26
15:12	2,242.50	22	4	26
15:12	2,243.00	45	11	56
15:12	2,243.50	35	1	36
15:13	2,241.50	16	72	88
15:13	2,242.00	34	4	38
15:13	2,242.50	34	11	45
15:13	2,243.00	3	0	3
15:14	2,241.50	2	42	44
15:14	2,242.00	8	29	37
15:14	2,242.50	63	29	92
15:14	2,243.00	10	9	19
15:14	2,243.50	14	2	16
15:15	2,242.00	1	2	3
15:15	2,242.50	39	48	87
15:15	2,243.00	325	10	335
15:15	2,243.50	133	395	528
15:15	2,244.00	236	9	245
15:15	2,244.50	8	37	45
15:16	2,242.00	0	10	10
15:16	2,242.50	0	260	260
15:16	2,243.00	10	36	46
15:16	2,243.50	26	32	58
15:16	2,244.00	20	10	30
15:16	2,244.50	1,228	2	1,230
15:17	2,242.00	3	6	9
15:17	2,242.50	5	78	83
15:17	2,243.00	4	104	108
15:17	2,243.50	23	64	87
15:17	2,244.00	0	46	46
15:18	2,241.50	0	13	13
15:18	2,242.00	175	94	269
15:18	2,242.50	347	10	357
15:18	2,243.00	3	3	6
15:18	2,243.50	22	1	23
15:19	2,242.00	3	44	47
15:19	2,242.50	71	371	442
15:19	2,243.00	27	167	194
15:19	2,243.50	27	120	147
15:20	2,242.00	0	137	137
15:20	2,242.50	151	156	307
15:20	2,243.00	26	0	26
15:20	2,243.50	39	41	80
15:21	2,242.00	0	382	382
15:21	2,242.50	46	10	56
15:21	2,243.00	80	308	388
15:21	2,243.50	278	246	524
15:22	2,240.50	0	326	326
15:22	2,241.00	6	10	16
15:22	2,241.50	2	14	16
15:22	2,242.00	0	20	20
15:23	2,241.50	102	0	102
15:23	2,242.00	50	2	52
15:23	2,242.50	216	38	254
15:23	2,243.00	24	19	43
15:23	2,243.50	26	0	26
15:24	2,243.50	193	913	1,106
15:24	2,244.00	113	1	114
15:24	2,244.50	216	1	217
15:25	2,241.50	5	2	7
15:25	2,242.50	2	25	27
15:25	2,243.00	503	21	524
15:25	2,243.50	9	373	382
15:25	2,244.00	32	52	84
15:25	2,244.50	843	16	859
15:26	2,240.50	1	119	120
15:26	2,241.00	1	0	1
15:26	2,241.50	21	45	66
15:27	2,241.50	89	0	89
15:27	2,242.00	10	10	20
15:27	2,242.50	10	90	100
15:27	2,243.00	25	619	644
15:27	2,243.50	32	61	93
15:27	2,244.00	102	0	102
15:28	2,241.00	0	10	10
15:28	2,241.50	0	48	48
15:28	2,242.00	0	60	60
15:28	2,242.50	81	7	88
15:28	2,243.00	54	263	317
15:28	2,243.50	325	0	325
15:28	2,244.00	24	0	24
15:29	2,241.50	0	680	680
15:29	2,242.00	0	11	11
15:29	2,242.50	38	7	45
15:29	2,243.00	1	19	20
15:29	2,243.50	165	54	219
15:29	2,244.50	1	0	1

Calculation from the 15:00–15:29 footprint data:

┌─────────────────────────────────────────────────┐
│                                                   │
│           Σ ( Price_level × (Buy + Sell) )        │
│  VWAP  =  ─────────────────────────────────       │
│                  Σ (Buy + Sell)                   │
│                                                   │
└─────────────────────────────────────────────────┘

• Total volume = 27,277
• Total price × volume = ₹61,150,719.50
• Footprint VWAP = ₹2,241.8418

This is the footprint-derived closing-price estimate.
It differs from the official ₹2,242.25 because this export aggregates executions into footprint price levels(0.5) rather than providing every raw exchange trade.

[dtyxg]

2. Official BSE Sensex Index Formula

Closing value of the index ≠ VWAP of the index itself.

It is calculated by recomputing the index using the official closing prices of each constituent stock, where each stock’s closing price is determined using the exchange’s closing-price methodology.

                Σ ( Closing Priceᵢ × Shares Outstandingᵢ × IWFᵢ )
Index  =  ──────────────────────────────────────────────────────
                                  Divisor

where:

• Closing Priceᵢ = official BSE closing price of constituent i
• Shares Outstandingᵢ = total listed shares
• IWFᵢ = Investible Weight Factor (free-float factor)
• Divisor = index divisor maintained by BSE to preserve continuity after corporate actions

Summed over all 30 Sensex constituents.

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3. Data Needed for the EXACT Formula

#	Input	Count	Public?
1	Official BSE closing price	30	yes
2	Shares outstanding	30	yes
3	IWF	30	proprietary/Not Published
4	Divisor	1	proprietary/Not Published

Blockers: IWF and Divisor aren’t published by BSE — so the exact formula can’t be run directly from public data.

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4. The Workaround (ratio / return method)

Since IWFᵢ, Shares Outstandingᵢ, and the Divisor are all identical today and yesterday (no corporate action overnight), write the formula for both days and divide:

Index_today       Σ ( Priceᵢ,today × Shares Outstandingᵢ × IWFᵢ )
────────────  =  ──────────────────────────────────────────────      ← Divisor cancels
Index_yest        Σ ( Priceᵢ,yest  × Shares Outstandingᵢ × IWFᵢ )

Since each stock’s weight already equals (Priceᵢ × Shares Outstandingᵢ × IWFᵢ) ÷ Total Free-Float Market Cap, this reduces to:

┌──────────────────────────────────────────────────────────────────┐
│                                      ⎛           Price_today ⎞     │
│  Index_today = Index_yesterday ×  Σ ⎜ weightᵢ × ─────────── ⎟     │
│                                      ⎝           Price_yest  ⎠     │
└──────────────────────────────────────────────────────────────────┘

No IWF, no Shares Outstanding, no Divisor needed — all baked into the weights.

Data needed for the workaround

#	Input	Count	Have it?
1	Yesterday’s Sensex close (anchor)	1
2	Each stock’s weight	30
3	Each stock’s price yesterday	30
4	Each stock’s price today	30

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5. The Data (your latest ranked weightage)

Getting the weightage also took me a lot of time. I searched everywhere but couldn’t find the official data. So, I ultimately reconstructed it from the Nippon India ETF BSE Sensex portfolio dated 30 June 2026. It holds all 30 constituents in index proportions, plus 0.39% cash. I removed the cash and renormalized the weight of every stock.

Anchor: 22-Jul-2026 Sensex close = 76,755.05

#	Stock	Weight %	22-Jul Close ₹	23-Jul Close ₹	Change %
1	HDFCBANK	13.42	753.15	748.00	−0.68
2	ICICIBANK	10.88	1,441.00	1,433.95	−0.49
3	RELIANCE	9.65	1,288.85	1,275.35	−1.05
4	BHARTIARTL	6.22	1,950.05	1,931.15	−0.97
5	LT	5.34	3,816.85	3,793.60	−0.61
6	SBIN	4.70	1,025.35	1,012.85	−1.22
7	AXISBANK	4.25	1,239.75	1,222.95	−1.36
8	INFY	3.85	1,052.30	1,051.80	−0.05
9	KOTAKBANK	3.19	381.80	383.45	+0.43
10	ITC	3.05	280.80	281.40	+0.21
11	M&M	3.03	3,174.65	3,228.70	+1.70
12	BAJFINANCE	2.96	1,060.00	1,039.50	−1.93
13	TCS	2.27	2,208.85	2,242.25	+1.51
14	SUNPHARMA	2.22	1,942.95	1,954.05	+0.57
15	ETERNAL	2.11	283.40	286.70	+1.16
16	HINDUNILVR	2.09	2,158.00	2,160.70	+0.13
17	MARUTI	2.01	13,546.50	13,396.05	−1.11
18	TITAN	1.99	4,705.65	4,696.55	−0.19
19	NTPC	1.87	350.55	348.75	−0.51
20	TATASTEEL	1.71	186.50	184.25	−1.21
21	BEL	1.63	406.80	405.30	−0.37
22	ADANIPORTS	1.48	1,819.35	1,778.30	−2.26
23	ULTRACEMCO	1.47	11,876.50	11,930.00	+0.45
24	POWERGRID	1.44	288.30	289.80	+0.52
25	INDIGO	1.33	5,120.65	5,023.90	−1.89
26	ASIANPAINT	1.32	2,693.05	2,669.00	−0.89
27	HCLTECH	1.25	1,237.55	1,244.85	+0.59
28	TRENT	1.19	2,887.55	2,874.10	−0.47
29	BAJAJFINSV	1.10	1,883.40	1,889.35	+0.32
30	TECHM	0.98	1,557.55	1,554.00	−0.23
	Total	100.00

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6. The Calculation (step by step)

1. For each stock compute weight × (price_today / price_yesterday).
   Example — HDFCBANK: 0.1342 × (748.00 ÷ 753.15) = 0.133283
2. Sum all 30 terms → Σ = 0.994917
3. Multiply by the anchor:

   Index_23Jul = 76,755.05 × 0.994917 = 76,384.86
   

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7. Result

	Value
Calculated close	76,384.86
Actual BSE close	76,391.39
Difference	−6.53 pts
% error	−0.0086%

Independently reproduced to within 0.0086% — using only the anchor, your weightage, and two days of prices, with the Divisor and IWF never required directly (they cancel via the weights).

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8. Why It’s Not Exact to the Last Paisa

Weights are a vendor free-float reconstruction, not BSE’s exact proprietary Shares Outstanding × IWF product.

These are data-source accuracy limits, not formula or precision limits. Closing the last few points needs BSE’s two entitlement-only inputs: the exact IWF (or index shares) and the exact official closing prices.

[Patel_6]

It’s wrong. It should be :

% Change in index = weighted avg of % change in constitutes .