BSE shares fall about 3% after the exchange flags that SEBI's new Closing Auction Session is driving lower trading volumes; NSE and BSE equity derivatives turnover hits a multi-month low in August
3 Sept, 04:32 IST · Plays out over weeks · 4 sources
A new rule that changes how the closing share price is set each day has made people trade less on India's exchanges. Exchanges, brokers and depositories all earn money per trade, so less trading means less revenue for them.
Key facts
What the reporting establishes, before any reading of it.
- BSE shares fell about 3% after the exchange acknowledged that the newly introduced Closing Auction Session (CAS) contributed to lower trading volumes
- NSE and BSE equity derivatives turnover hit a multi-month low in August amid CAS-related volatility
- BSE is courting high-frequency trading firms to boost closing-auction liquidity after encountering liquidity challenges
- BNP Paribas handled about USD 1.9 billion of the record USD 4.2 billion of MSCI-linked Indian trades routed through the new closing auction
How the news spreads
Step by step — from the first companies it hits to whole sectors.
Who it hits first
- BSE acknowledged that SEBI's newly introduced Closing Auction Session has contributed to lower trading volumes, and its shares fell about 3%.
- NSE and BSE equity derivatives turnover hit a multi-month low in August amid volatility around the new closing mechanism.
- BSE is now courting high-frequency trading firms to rebuild closing-auction liquidity, an admission that the mechanism needs repair.
Who may gain
- High-frequency trading firms, which BSE is actively courting with incentives to provide closing-auction liquidity.
- Large execution desks that can handle the new mechanism - BNP Paribas alone handled about USD 1.9 billion of the record USD 4.2 billion of MSCI-linked Indian trades routed through the closing auction.
- MCX, whose commodity franchise sits outside the equity rule change and is therefore the least affected listed exchange.
Along the supply chain
Downstream
Downstream sits the clearing, settlement and depository layer - CDSL charges a fee on each transfer between demat accounts - and then the brokers who intermediate. Angel One is the most geared because retail derivatives brokerage is essentially its only revenue line. Nuvama's wealth and broking revenue is similarly turnover-linked.
Upstream
The upstream supplier is order flow itself, produced by retail traders, proprietary desks and institutions. The Closing Auction Session changed how the closing price is determined, and until participants adapt they submit smaller orders, so upstream supply of order flow has thinned. BSE's move to court high-frequency firms is a direct attempt to buy that supply back.
Where demand moves
Business
The 'product' being sold here is a trade, and fewer are being bought. Exchanges charge per trade, depositories charge per transfer and brokers charge per order, so a fall in market turnover reduces revenue at every layer of the chain simultaneously - there is no offsetting winner inside it. The demand has not moved to a rival venue; it has been deferred or cancelled because participants are still learning how the new closing mechanism prices the day's final trade and are reducing size until they understand it.
Capital
Capital is rotating out of the entire listed market-infrastructure complex - exchanges, depositories and brokers - because all of them are geared to the same turnover variable. That rotation is amplified by valuation: this is the most expensively rated cluster in the Financial Services sector, with CDSL at PE 60.51, MCX at PE 54.34 and BSE at PE 45.60 against a Financial Services sector median PE of 18.56. Money leaving here is going to lenders and banks, which are geared to credit growth rather than to trading volume.
How it spreads across sectors
Financial Services
Exchanges, depositories and brokers all de-rate together because every one of them earns per trade, and the cluster carries the sector's highest valuations
When it plays out
Immediate
Market-infrastructure stocks de-rate on the volume data; BSE has already fallen about 3%.
Medium term
Over one to six months, market microstructure changes historically normalise as participants adapt, so the volume drag should fade. The risk is that these stocks are priced for growth, not for a plateau, so even a stabilisation at the new lower level justifies a lower multiple.
Short term
Over one to four weeks, September turnover data is the test of whether August was a one-off adjustment or a persistent level shift. BSE's high-frequency liquidity programme is the variable to watch.