SEBI CAS Review: 20,000 Comments as Angel One and Capital Market Stocks Rise

The SEBI CAS review has turned into one of the most closely watched market-structure consultations of 2026. The regulator has received about 20,000 comments on its consultation paper covering the closing auction session (CAS), market timings and how derivatives are settled, BusinessLine reported. Capital market stocks rose on Monday, 12 October, ahead of the outcome, with Angel One up more than 5%, CNBC-TV18 reported.

What exactly SEBI is reviewing

According to SEBI’s consultation paper, CAS came into the cash segment for stocks that have derivatives contracts with effect from 3 August 2026. Before that, a stock’s closing price was the volume-weighted average price (VWAP) of trades in the last 30 minutes of continuous trading. Under CAS, the closing price comes out of an auction that matches the buy and sell orders in the book.

The sticking point is derivatives settlement, particularly on expiry days. Derivatives keep trading while the underlying stocks are in the auction, which lets traders react to “evolving” auction prices. SEBI has put two options on the table:

• Option 1: settle derivatives on a blended VWAP of the last 30 minutes of continuous trading plus the 10-minute CAS.
• Option 2: return to the VWAP of continuous trading alone for at least a year before any shift to the blended method.

Where the comments landed

• Comments received: about 20,000 by the deadline. Only a week earlier, SEBI chairman Tuhin Kanta Pandey had cited more than 3,500
• Majority view: stick with the existing 30-minute continuous-trading VWAP for now
• Futures Industry Association (FIA): supported Option 2, warning that a blended price would be hard to track because the weights are known only after the auction
• Market timings: FIA backed a proposal to keep continuous trading in CAS stocks going until 3:30 PM, followed by the auction, with derivatives trading until 3:45 PM
• Other proposals: tighter limits on cancelling orders placed more than 1% away from the reference price, changes to how unexecuted iceberg orders are treated, and a shorter transition into CAS

For brokers and exchanges, the settlement method on expiry day isn’t a technicality. It shapes how much derivatives volume flows through the closing minutes of the market.

SEBI CAS review: why capital market stocks moved

Brokers like Angel One and the exchange operators make a big chunk of their revenue from derivatives activity. A framework that keeps expiry days predictable is usually read as good for volumes. A complicated or restrictive one could cool activity down. Monday’s move was traders positioning before SEBI makes up its mind. CNBC-TV18 also pointed out that the Sensex and Nifty Bank settled more than 100 points above their reference prices after that day’s closing auction, which tells you how much CAS can shift closing levels.

What it means for investors

SEBI will work through the feedback before it finalises the framework. Index traders care because the outcome decides how expiry-day settlement prices are set. For anyone holding broker or exchange stocks, it feeds straight into volumes. We’re tracking the story on our Stock Market Today India hub, and our recent piece on SEBI’s new rules for October 2026 has more background.

Sources: SEBI consultation paper, BusinessLine, CNBC-TV18. Not investment advice.