Branch² Intelligence

The rollout of the new Closing Auction Session (CAS) by BSE has led to a significant drop in trading volumes, prompting the exchange to seek feedback from dealers and propose changes to regulators.

IN · 2026-09-03

India — direction and magnitude withheld

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Key takeaway

BSE's new Closing Auction Session rollout has significantly reduced trading volumes.

  1. Step 1 · The triggerBSE rolls out the new Closing Auction Session, leading to reduced trading volumes
  2. Step 2 · Knock-onDecreased trading volumes result in wider bid-ask spreads, increasing transaction costs for traders
  3. Step 3 · Reaches youSMEs reliant on trading face higher costs and reduced liquidity, impacting their operational margins

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: CNBC TV18 (Markets)

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