Branch² Intelligence

BSE investors are experiencing volatility due to the introduction of the Closing Auction Session (CAS), which replaced the VWAP-based closing price mechanism, but there are signs of recovery in options turnover.

IN · 2026-09-07

India — direction and magnitude withheld

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Key takeaway

Sebi replaced the VWAP-based closing price with a Closing Auction Session (CAS) on BSE and NSE.

  1. Step 1 · The triggerSebi replaces the VWAP-based closing price with a Closing Auction Session on BSE and NSE, altering the closing price discovery process.
  2. Step 2 · Knock-onShort-term volatility and reduced options turnover unsettle market participants and dampen BSE's transaction-fee revenue.
  3. Step 3 · Reaches youAs traders adapt and options turnover recovers, BSE's revenue and market liquidity stabilize, restoring normal conditions for SMEs accessing capital markets.

The trigger is reported by the source below. The steps that follow are Branch²’s traced reasoning — how the shock could reach a business like yours, not a prediction.

Source: LiveMint Markets

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This is automated analysis for information only. It is not investment advice, not a recommendation, and not a solicitation to buy or sell any security. Branch² is not authorised or regulated. Do your own research.