How Indian Stock Markets Work

Why does a stock market exist?

Think about Reliance Industries. Jio alone cost over ₹1.5 lakh crore to build. No single bank would lend that. So companies go to millions of ordinary people and say: give us money, and in return we give you a small ownership stake in our business. That exchange, money for ownership, is what a stock market is.

When you buy a share of Reliance, TCS, HDFC Bank, or Infosys, you are not lending them money. You become a part-owner. A tiny part, but a real, legal one. That distinction matters more than most people realise.

NSE and BSE, India's two main exchanges

Most large companies, RILReliance TCSTCS HDFCBKHDFC Bank INFYInfosys, are listed on both. As a retail investor it barely matters which exchange you use; your broker handles it. What matters is the benchmark: for systematic investing that is the Nifty 50 or Nifty 500.

SEBI, the referee

SEBISEBI Securities and Exchange Board of India is the regulator that oversees everything. SEBI was given statutory powers in 1992, partly in response to the Harshad Mehta scam which exposed how badly an unregulated market could be manipulated.

• Sets rules for mandatory quarterly financial disclosures, no surprises
• Regulates brokers and requires segregated client accounts, your money stays yours
• Ensures your demat account holdings are protected even if your broker shuts down
• Sets circuit breakers, automatic trading halts when a stock moves too fast

How a trade settles, T+1

Why T+1 is a big deal for retail

Most countries still settle equity at T+2. The US started its T+1 transition in 2024. India was first among major markets, moving the entire equity book to T+1 in January 2023. The shift looks like a small operational change. The investor consequence is large.

Capital becomes free a day earlier. That sounds trivial until you scale it. A trader who turns the book once a day at T+2 has every rupee of capital tied up for two extra days on every cycle. At T+1 the same rupee comes back twice as fast. SIP investors and long-term holders feel less of this; active traders and fund managers feel a lot of it because their realised cost of capital improves.

Counterparty risk also drops. Every additional day between trade and settlement is a day when something can go wrong with the broker, the clearing member, or the underlying counterparty. Cutting that window in half halves the exposure window. SEBI has indicated the next move toward T+0 settlement (same day) for select segments; that conversation is live, and the infrastructure (NSE, BSE, NSDL, CDSL) has already proven it can handle the speed.

Demat versus broker, the difference that matters

Beginners often confuse the two. A broker is a service that gives you the gateway to place orders. The demat account is the electronic record of share ownership held with a depository participant (DP), which in turn is connected to NSDL or CDSL. They are separate things and the legal weight sits with the depository, not the broker.

The day a broker fails, the order gateway stops. But the shares in your demat are still legally yours, recorded by NSDL or CDSL. SEBI rules require demat-based holding precisely because of this separation. The 2020 Karvy case in India was the textbook example, where a broker had pledged client shares without consent. The cleanup was painful but no one's actual demat holdings vanished, because the depository is independent. Always check your CAS (Consolidated Account Statement) sent monthly by NSDL or CDSL; it is the source of truth, not your broker app.

Your demat account

Before 1996, shares were physical paper certificates. Losing them was catastrophic. SEBI mandated dematerialisation, all shares converted to digital form. Your demat account is held by either NSDLNSDL or CDSLCDSL. Your broker gives you access to it, but the account belongs to you, not your broker. If your broker shuts down tomorrow, your shares are completely safe.

Who participates?

FIIs and DIIs tend to move counter to each other, when FIIs sell (global risk-off), DIIs typically buy. I have watched this dynamic cushion several sharp corrections in Indian markets over the last decade.

Market hours

As a systematic investor you do not need to watch the market during trading hours. Signals run on end-of-day data. Rebalancing happens on a schedule, not on intraday reactions.

What equity ownership actually means

Key terms