How Indian Stock Markets Work

Why does a stock market exist?

Think about Reliance Industries. Its telecom network alone took well over ₹1.5 lakh crore of capital to build. No single bank lends that. So a company goes to millions of ordinary people and says: give us money, and in return you own a small slice of the business. That swap, 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, and it is the first thing I explain to anyone who asks me where to start.

NSE and BSE, India's two main exchanges

Sources: NSE corporate presentation, May 2026 (FY26 market shares); NSE offer document, September 2026 (listed entities); BSE listing data, June 2026.

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 routes the order. What matters is the benchmark. For systematic investing that is the Nifty 50 or the Nifty 500.

The split between the two is not even. NSE did about 93% of cash market turnover in FY26 and nearly all equity futures. BSE has far more listed companies, many of them small, and it won back a real slice of index options after 2023. Two exchanges competing is good for you. It keeps fees honest and gives the system a backup.

SEBI, the referee

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

1. 1875BSE founded on Dalal Street

   Asia's first stock exchange, first called the Native Share & Stock Brokers Association.

2. 1988SEBI set up

   An advisory body, with no enforcement powers yet.

3. 1992SEBI gets statutory powers

   After the Harshad Mehta scam. NSE is incorporated the same year.

4. Nov 1994NSE goes live

   Screen based trading, and the shouting ring starts to empty.

5. 1996Dematerialisation begins

   NSDL is created. Paper share certificates start becoming history.

6. 27 Jan 2023T+1 for every stock

   India settles faster than most large markets.

7. 28 Mar 2024Optional T+0 beta

   Same day settlement starts with 25 stocks, later widened to up to 500.

8. 3 Aug 2026Closing auction session

   Stocks with F&O contracts get their close from an auction, not an average.

• Sets the rules for quarterly results and disclosures, so there are fewer surprises
• Regulates brokers and requires client money and securities to stay segregated, so your money stays yours
• Keeps your holdings with an independent depository, so they survive a broker shutting down
• Runs circuit breakers: market wide halts at 10%, 15% and 20% index moves, plus daily price bands on single stocks

How a trade settles, T+1

1. YouPlace a buy order in your broker app.
2. BrokerChecks your funds and routes the order.
3. NSE or BSEThe matching engine pairs it with a seller.
4. ClearingNets the day's trades and guarantees settlement.
5. Your dematShares arrive through NSDL or CDSL on T+1.

Why T+1 is a big deal for retail

For years most of the world settled equity at T+2. The US moved to T+1 only in May 2024. India got there first among large markets, completing the shift on 27 January 2023 after a phased move that started with the smallest stocks in February 2022. It looks like a small operational change. The investor consequence is large.

Capital comes back a day earlier. That sounds trivial until you scale it. Sell on Monday and the money is usable on Tuesday, not Wednesday. A SIP investor barely notices. An active trader, or a fund manager rotating a book every two weeks, notices a lot, because every rupee works more days in the year.

Counterparty risk also drops. Every extra day between trade and settlement is a day when something can go wrong with a broker or a clearing member. Halve the window and you halve that exposure. SEBI then went further with an optional same day settlement, T+0, which started as a beta on 28 March 2024 and was later widened to up to 500 eligible stocks. It runs alongside T+1, it needs funds and shares in place before you trade, and so far uptake is small. Treat T+1 as the system you live in.

Demat versus broker, the difference that matters

Beginners often mix up the two. A broker gives you the gateway to place orders. The demat account is the electronic record of what you own, kept by a depository participant that connects 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. The shares in your demat are still legally yours. SEBI built the system around this separation. The Karvy case, which came to light in November 2019, is the textbook example: a broker had pledged client shares without consent to raise money for itself. SEBI froze it, the exchanges and depositories stepped in, and client holdings were moved back to their owners. The cleanup was painful, and it led to tighter pledge rules in 2020. Check your Consolidated Account Statement (CAS) from NSDL or CDSL every month. It is the source of truth, not your broker app.

Your demat account

Before 1996, shares were paper certificates. Lose them and you had a long, ugly fight to prove ownership. SEBI pushed dematerialisation, and today almost every listed share exists only in digital form. Your demat account is held with either NSDLNSDL or CDSLCDSL. Your broker gives you access to it, but the account belongs to you. If your broker shuts down tomorrow, you move the account to another one and carry on.

The numbers tell you how fast this has grown. CDSL alone reported 19.34 crore beneficiary accounts at the end of September 2026, and NSDL serviced about 4.5 crore in May 2026. That is well over 23 crore demat accounts, against roughly 4 crore in March 2020. Many people hold more than one, which is why NSE counts unique investors by PAN instead: 13.5 crore at the end of August 2026.

Who participates?

Read that chart twice. For decades foreign portfolio investors were the marginal buyer of Indian stocks. In the June 2026 quarter they owned 15.1% of NSE listed companies, the lowest in more than 17 years, after record outflows. Domestic institutions owned 19.5% and have stayed ahead of foreign money for seven quarters in a row. Add the shares individuals hold through mutual funds to the 9.5% they hold directly, and Indian households own a record 19.3%.

FIIs and DIIs tend to move against each other. When FIIs sell in a global risk off, DIIs, fed by monthly SIP money, usually buy. I have watched this dynamic cushion several sharp corrections in Indian markets over the last decade. It does not stop a fall. It changes how deep and how long it runs.

Market hours

Source: NSE circulars on the closing auction session, NSE/CMTR/73362 (18 Mar 2026) and NSE/CMTR/75479 (30 Jul 2026), following SEBI's circular of 16 Jan 2026.

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. The closing price is the one number every index, every fund NAV and every back test uses, which is why SEBI moved to an auction for it: one price set by the whole order book is harder to push around in the last few minutes.

What equity ownership actually means

Owning equity means you share in profits you did not have to earn yourself. Companies like RILReliance and TCSTCS grew their profits for decades, and patient owners collected that growth through price and dividends. Lenders got their interest and nothing more.

Ownership also means you take the bad years. On 9 October 2026 the Nifty 50 was 9.9% below where it stood two years earlier, and quality and momentum style indices were down more. Equity pays you for sitting through stretches like that. It does not pay you for avoiding them.

A worked example: your first trade, start to finish

Say you buy 10 shares of a Nifty 50 stock at ₹1,500 on a Monday. Here is what actually happens to your ₹15,000.

• Monday, 10:05 AM. You place a limit order at ₹1,500. Your broker blocks ₹15,000 plus charges. The exchange matches it within a second. The contract note arrives by evening.
• Monday evening. The clearing corporation nets every trade of the day. Your broker pays in on your behalf.
• Tuesday. Settlement day. The 10 shares are credited to your demat and the depository sends you a message. They are now yours, in your name, independent of the broker.
• Charges. On a ₹15,000 delivery buy you pay securities transaction tax of 0.1% (₹15), stamp duty of 0.015% (₹2.25), small exchange and SEBI fees, GST on fees, and whatever brokerage your broker charges. A depository charge applies when you sell. Module 1.5 breaks every line down.
• Month end. Your CAS lists the 10 shares. If the app and the CAS ever disagree, the CAS wins.

Common mistakes beginners make here

How this shows up in RupeeCase

All of this is the ground RupeeCase stands on. Your stocks sit in your own demat, with your own broker. RupeeCase never holds your money or your shares. Each strategy is a rules based index, run on NSE end of day data, and a rebalance is just a list of buy and sell orders placed through your broker, settling T+1 like any other trade. The simplest example is the Nifty 50 Equal Weight strategy: all 50 Nifty names at about 2% each. If you want to see how an account connects, Getting started walks through it.