That difference is more important than the fact that both companies are classified as financial-market infrastructure.

An exchange and a depository may serve many of the same investors, brokers and issuers, yet their revenue behaves differently through a market cycle.

For Bull Run's underlying company pages, see BSE Limited, CDSL, the Exchange and Data Platform sector and the Depositories, Clearing Houses and Other Intermediaries sector.

Q1 FY27: the scale of BSE's earnings acceleration

BSE's earnings engine has become derivatives-heavy

The single most important change in BSE's economics over the last few years has been the rebuilding of its equity-derivatives franchise.

Average daily premium turnover reached approximately ₹29,615 crore in Q1 FY27.

That was almost double the Q1 FY26 level.

Equity-derivatives revenue reached approximately ₹1,155 crore.

Against total BSE revenue from operations of ₹1,566 crore, that means equity derivatives represented roughly 74% of operating revenue on a simple analytical basis.

This is a remarkable transformation.

BSE historically operated in the shadow of NSE in equity derivatives.

Its re-entry through Sensex and Bankex options transformed derivatives from an insignificant line item into the dominant revenue engine.

The percentages above are an analytical calculation based on disclosed derivatives revenue divided by total revenue from operations.

They are not a company-defined segment margin.

Why premium turnover matters more than notional turnover for BSE

Options markets produce enormous notional turnover numbers.

Those numbers are useful for measuring activity but can be misleading for economic comparison.

A ₹1 lakh notional option position may require only a small premium payment.

Exchanges therefore often emphasise premium turnover when discussing the economics of options trading.

BSE's Q1 average daily premium turnover of ₹29,615 crore grew approximately 96% year on year.

That rapid increase translated almost directly into transaction-fee growth.

This is why derivatives have generated such extraordinary operating leverage.

BSE's cash market is improving too

The quarter was not only a derivatives story.

Equity cash average daily turnover reached a record approximately ₹9,955 crore.

That was roughly 39% above the prior-year quarter.

Cash-market transaction-charge revenue increased as well.

Management has been trying to build a more meaningful double-digit share of cash-market activity over time.

That matters because a stronger cash franchise would reduce BSE's dependence on options.

BSE StAR MF adds a very different type of transaction engine

BSE StAR MF processed approximately 23.4 crore transactions during Q1 FY27.

Transaction count increased around 28% year on year.

Revenue from the mutual-fund platform increased about 20% to approximately ₹73.3 crore.

This is strategically attractive because mutual-fund transactions have different drivers from equity derivatives.

SIP flows, distributor transactions and long-term financial savings create activity even when speculative trading is weaker.

StAR MF therefore provides BSE with a small but increasingly valuable diversification layer.

CDSL's engine begins with demat accounts

CDSL added approximately 58 lakh new demat accounts during Q1 FY27.

Total accounts reached 18.59 crore at June 30, 2026.

A year earlier, CDSL had approximately 15.86 crore accounts.

That implies account-base growth of roughly 17%.

CDSL maintained approximately 80% market share by number of demat accounts.

This is one of the strongest network positions among listed Indian financial-infrastructure companies.

Why a demat account is economically different from an options contract

An options trade exists for seconds, minutes, days or weeks.

A demat account can remain on the infrastructure for years.

The investor may:

• hold equity,
• receive IPO shares,
• receive bonus shares,
• pledge securities,
• vote electronically,
• receive account statements,
• participate in corporate actions,
• transfer securities.

CDSL therefore has multiple ways to monetise one long-lived investor relationship.

That does not make all revenue perfectly recurring.

Transaction fees still depend on market activity.

IPO and corporate-action charges can be cyclical.

But the account and issuer network itself is more persistent than trading turnover.

CDSL's revenue mix explains its greater stability

Q1 FY27 consolidated revenue components included approximately:

• ₹128 crore annual issuer income,
• ₹66 crore transaction charges,
• IPO and corporate-action income,
• online-data charges,
• e-voting and account-statement income,
• treasury and other income.

Using CDSL's roughly ₹293 crore revenue from operations as a simple denominator:

• annual issuer income represented approximately 44%, and
• transaction charges represented approximately 23%.

The calculations are analytical rather than company-reported segment percentages.

The important point is that CDSL does not rely on one transaction product for three-quarters of operating revenue.

Annual issuer income behaves like an infrastructure annuity

CDSL reported approximately 38.73 crore folios for the relevant issuer-charge framework.

Annual issuer income increased about 12.3%.

Management explains that these charges are formula-driven and linked to securities and folio counts.

That creates a fundamentally different earnings stream from derivatives turnover.

A company that issued shares years earlier can continue generating annual depository revenue as long as securities remain maintained in dematerialised form.

This is one reason depository earnings can be more resilient when trading activity falls.

Transaction charges still make CDSL partly cyclical

CDSL should not be described as a pure subscription business.

Transaction charges were approximately ₹66 crore in Q1.

When investors trade, securities need to move between beneficial-owner accounts.

Higher cash-market delivery volumes can therefore increase depository transaction revenue.

Pledge and margin-pledge activity also varies with market conditions.

CDSL is consequently exposed to market activity — just less directly than BSE's derivatives engine.

BSE and CDSL are not completely separate economic bets

BSE remains CDSL's sole promoter and owned approximately 15% of CDSL at June 2026.

That creates an important look-through relationship.

At Bull Run's August 25 CDSL market capitalisation of approximately ₹30,098 crore, a 15% stake had a quoted-market value of roughly:

₹4,515 crore.

BSE's own market capitalisation was approximately ₹1.53 lakh crore.

Therefore the market value of its CDSL holding represented only about 3% of BSE's own market capitalisation.

BSE's network effect is based on liquidity

An exchange becomes more valuable as more participants trade on it.

More traders create tighter bid-ask spreads.

Tighter spreads attract more traders.

More market makers increase depth.

Greater depth attracts larger institutional orders.

This is a classic liquidity flywheel.

CDSL's network effect is based on installed accounts

CDSL's network works differently.

More brokers and depository participants connect to CDSL because many customers already use it.

More investors use it because their brokers support it.

More issuers and intermediaries integrate with the depository because investor accounts are concentrated there.

Each new demat account expands the potential base for future transactions, pledges, corporate actions and investor services.

That produces a slower but potentially more durable network effect than trading liquidity.

Operating leverage: BSE won Q1 decisively

BSE revenue from operations increased approximately 63.5%.

Operating EBITDA increased approximately 67%.

Its EBITDA margin expanded to about 67%.

This is textbook exchange operating leverage.

Technology infrastructure, surveillance, compliance, matching engines and clearing connectivity involve large fixed costs.

Once those systems are built, the cost of processing an additional million contracts is far below the corresponding incremental transaction revenue.

That is why volume acceleration can produce enormous incremental profit.

CDSL is deliberately spending more on technology

CDSL's consolidated profit still grew approximately 15%, but expense growth was faster than revenue growth.

Technology, cyber-security and people investment remain major priorities.

This should not automatically be labelled bad operating leverage.

A systemically important securities depository cannot optimise short-term margin by underinvesting in resilience.

One major technology failure could damage trust across brokers, investors and regulators.

CDSL therefore needs to balance margin efficiency with infrastructure robustness.

Regulation affects BSE faster

BSE's current growth is heavily linked to equity derivatives.

Derivatives are also one of the most actively regulated areas of Indian capital markets.

Recent policy changes have included:

• larger contract sizes,
• changes to weekly-expiry availability,
• higher transaction taxes,
• stricter collateral and funding frameworks,
• enhanced surveillance,
• closing-auction reforms.

Any rule that lowers trading frequency, reduces intraday leverage or alters expiry concentration can affect BSE transaction revenue quickly.

This creates a direct link between regulatory design and earnings.

CDSL faces regulation too, but the transmission is different

CDSL's KYC subsidiary has already experienced regulatory fee resets.

Depository charges can also be changed by regulation.

Settlement systems, cyber-security, interoperability and direct-payout rules require constant investment.

Yet regulators are unlikely to want fewer demat accounts.

India's policy direction generally supports broader formal market participation.

CDSL's regulatory risk is therefore more often:

“How much can the infrastructure charge?”

rather than BSE's:

“How much trading activity will the rules permit or encourage?”

Which business is more cyclical?

BSE.

Its transaction revenue can rise extremely quickly during active markets.

The reverse is also possible.

If derivatives turnover falls sharply, the operating leverage works backwards.

CDSL has cyclical transaction revenue too, but annual issuer charges and the expanding demat-account base provide more structural support.

Valuation: the faster-growing company was cheaper on P/E

The most striking valuation feature is the P/E.

BSE was growing revenue and profit above 60% year on year but traded around 54x earnings.

CDSL was growing Q1 profit in the mid-teens yet traded near 64x.

That does not automatically mean BSE is cheaper.

The market may be assigning a lower multiple to BSE because its current earnings are more dependent on unusually strong derivatives activity.

CDSL's higher multiple reflects expectations for longer-duration demat-account compounding and less reliance on one trading product.

P/B tells the opposite story

BSE traded near 22.9x book.

CDSL traded around 15.4x.

Both multiples look extremely high compared with banks or industrial companies.

That is normal for asset-light market infrastructure.

Neither company needs a large balance sheet to generate revenue.

Return on equity therefore matters much more than book value alone.

BSE's Bull Run ROE was approximately 45% versus CDSL at 24.5%.

A high P/B multiple is easier to support when shareholder equity generates very high returns.

Which has the better business model?

There is no universal answer.

BSE has the more powerful operating-leverage model.

If market share and derivatives activity keep increasing, revenue can compound extremely quickly without equivalent cost growth.

CDSL has the more durable installed-base model.

Demat accounts and issuer relationships accumulate over time and generate several different fee streams.

Which has the stronger competitive moat?

Both have substantial moats, but the moat mechanics differ.

BSE must continuously defend liquidity.

If participants migrate to another exchange, liquidity can move with them.

CDSL's demat accounts are stickier.

Moving millions of investors between depositories involves broker processes, account infrastructure and customer friction.

CDSL's roughly 80% account market share therefore looks more stable than any single exchange derivatives market-share figure.

BSE's upside is that liquidity moats can become extraordinarily profitable once established.

BSE vs CDSL: category-by-category

Which is stronger in 2026?

BSE currently has the stronger earnings-growth profile.

The exchange has successfully converted derivatives-market-share gains into high-margin revenue and exceptional profit growth.

The current valuation does not appear obviously more expensive than CDSL on P/E despite that growth.

CDSL has the more structurally recurring infrastructure franchise.

Its 18.59 crore accounts, 80% market share and issuer-charge model create a long-duration installed base.

The trade-off is that current earnings growth is much slower while the stock still commands a premium earnings multiple.

The decisive question is therefore not simply “exchange or depository?”

It is:

How durable will BSE's derivatives economics be under future regulation, and how much growth is already embedded in CDSL's ~64x valuation?

What to monitor next

• BSE derivatives premium ADT: the dominant current earnings driver.
• BSE derivatives revenue share: watch whether concentration begins to fall as cash and StAR MF scale.
• BSE cash-market share: greater cash penetration improves diversification.
• BSE StAR MF transactions: recurring financial-savings activity can reduce dependence on derivatives.
• CDSL new demat accounts: tests the durability of India's retail-investor expansion.
• CDSL account market share: watch whether NSDL gains incremental share.
• CDSL annual issuer income: one of the most stable revenue lines.
• CDSL technology expenses: necessary infrastructure spend should eventually translate into scalable revenue.

Frequently asked questions