India’s markets regulator may pause the use of closing-auction prices to settle derivatives and return temporarily to a final-30-minute volume-weighted average price (VWAP), Reuters reported on October 5, 2026, citing two unnamed sources. SEBI has officially announced a review and published a consultation paper, but the sources available as of October 7 do not confirm a final rule or effective date.
What is SEBI changing about derivatives settlement prices?
The reported change concerns how the settlement price for derivative contracts is calculated—not whether stock closing auctions will continue. Reuters says SEBI is likely to stop using the closing-auction price for derivatives settlement for at least a year and instead use the VWAP of the final 30 minutes of trading. That proposed approach and its duration are based on unnamed sources, not a confirmed SEBI circular.
Reuters also reports that closing auctions would continue to determine end-of-day cash-market prices for less-liquid shares. The reported distinction is therefore between the price used to settle derivatives and the closing price established for certain underlying shares.
What are CAS and the final-30-minute VWAP?
Closing Auction Session
A Closing Auction Session (CAS) is an end-of-day auction mechanism used to help determine a stock’s closing price. It matters to futures and options because derivative settlement prices are linked to the underlying shares. The dispute is about whether the auction outcome should also be used to calculate those derivative settlement prices.
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Final-30-minute VWAP
VWAP is a volume-weighted average price: prices during a specified period are weighted by the volume traded at each price. Under the approach Reuters describes, the relevant period would be the last 30 minutes of trading rather than a single closing-auction outcome. The available account does not specify the detailed calculation rules or which contracts would be covered.
What is confirmed, and what is still only reported?
| Issue | What the available information establishes |
|---|---|
| SEBI review | SEBI announced a review of derivative settlement-price methodology in light of the CAS rollout on September 3, 2026. SEBI’s September 3 announcement. |
| Consultation | SEBI published a consultation paper on September 12, 2026, covering CAS, market timings and derivative settlement methodologies. The official listing identifies it as a public-comments report, not a final rule. SEBI’s consultation-paper page. |
| Temporary VWAP approach | Reuters reported on October 5, citing two unnamed sources, that SEBI was likely to use the final-30-minute VWAP for derivative settlement for at least a year instead of the closing-auction price. Reuters report carried by MarketScreener. |
| Final rule and start date | Not established by the cited official announcements or Reuters report. SEBI’s reports listing identifies the September 12 item as a consultation paper. SEBI Reports & Statistics. |
In short, the official record establishes that SEBI opened a review and consultation. The specific temporary VWAP plan remains a reported likely decision, not a verified operative rule. The September 12 consultation PDF’s detailed proposals are not independently confirmed by the available source text.
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Why did the proposal draw pushback?
Reuters reported that SEBI received 20,000 suggestions in response to the consultation, attributing the figure to a SEBI post on X. That is Reuters’ account of the post; it should not be read as an independently verified count of formal comments.
The Reuters account also describes a transparency concern about the consultation proposal for the CAS window: it contemplated withholding an indicative index value while continuing to show indicative prices for individual stocks. Sources cited by Reuters said sophisticated trading desks could reconstruct the index from those stock indications, so withholding the index might reduce transparency without resolving manipulation concerns. Reuters reported that the regulator agreed with this view and would increase awareness that the index price is determined only at the end of the window. These details are attributed to unnamed sources and are not confirmed decisions in an official circular.
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Will Indian stock and derivatives market timings change?
Reuters reported that feedback favored keeping regular trading open until 3:30 p.m. and derivatives trading until 3:45 p.m., and that the timetable was expected to remain broadly intact. Treat that as a reported expectation, not a confirmed final decision. The available sources do not establish whether SEBI or the exchanges have issued an operative notice changing—or formally retaining—those hours.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should traders and investors check next?
Before relying on the reported approach for a trade or settlement calculation, look for the final SEBI circular and the relevant exchange implementation notices. Those documents would establish the formula, covered contracts, any low-liquidity exception, treatment of indicative index values, market hours and effective date. Until then, the final-30-minute VWAP approach should be described as reported, not in force.
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