NISM-Series-XV: Research Analyst · Introduction to Securities Market

Secondary Market, Trading and Settlement Explained

Updated 11 October 2026 · Fact-checked

The secondary market is where investors buy and sell already issued securities on exchanges. Orders match on a trading system, the clearing corporation guarantees and nets the trades, and settlement moves money and securities, currently on a T+1 cycle for equities. Indices like Sensex and Nifty track market movement using free-float market capitalisation.

Understand Secondary Market, Trading and Settlement

The secondary market is where existing securities change hands between investors. The company does not receive money from these trades. The money goes from the buyer to the seller. The primary market is where the company raises fresh funds. This difference is a common exam question.

In India, trading happens on stock exchanges such as BSE and NSE. Trading is screen-based and electronic. Only registered trading members (brokers) can place orders on the exchange. Investors place orders through brokers. Orders are matched by the exchange system on price-time priority: the best price gets matched first, and at the same price the earlier order gets matched first. Most trading is order-driven, where buy and sell orders from many participants meet in an order book.

After a trade, the clearing corporation steps in. It works out what each member must pay or deliver, nets the obligations, and acts as the central counterparty. This means it becomes the buyer to every seller and the seller to every buyer, which removes counterparty risk. It manages risk using margins and a settlement guarantee fund. Clearing is the calculation of obligations. Settlement is the actual transfer of funds and securities. Securities are held in demat form with depositories (NSDL and CDSL), and the transfer happens through the depository participant.

Indian equity cash market follows a T+1 rolling settlement cycle. T is the trade day. Settlement happens on the next working day. Shares are credited to the buyer's demat account and money is paid to the seller through the clearing process. Trades in the rolling cycle are settled on the basis of the trade day, not on a weekly or fortnightly cycle.

A market index is a number that shows the movement of a group of stocks. Sensex is BSE's index and Nifty 50 is NSE's index. Both are free-float market capitalisation weighted. This means each stock's weight depends on the market value of shares available for public trading, not on shares held by promoters. Indices act as benchmarks for portfolios and underlie index funds and derivatives.

Key formulas to remember

Settlement date under T+1: Settlement day = T + 1 working day; T is the trade day. Holidays and weekends are not counted as working days.
Market capitalisation: Market cap = Share price × Total number of shares outstanding; This is the full market value of the company's equity.
Free-float market capitalisation: Free-float market cap = Share price × Number of free-float shares; Free-float shares exclude promoter and other locked-in or strategic holdings.
Index value (free-float method): Index = (Current free-float market cap ÷ Base free-float market cap) × Base index value; Indices use a base date and base value. Adjustments (divisor changes) handle corporate actions so the index does not jump artificially.
Order matching rule: Price priority first, then time priority; Higher bids and lower asks get priority. At equal price, the earlier order executes first.
Net obligation: Net obligation = Total buy value − Total sell value (per member, per security or in funds); Clearing nets obligations so only the net amount or net quantity is settled.

How to solve Secondary Market, Trading and Settlement questions

Use this method for any question on secondary market structure, trading, settlement or indices.

1Identify the stage being asked about: trading, clearing, settlement or index construction.
2Check whether the question is about the primary or secondary market. In the secondary market the issuer receives no money.
3For trading questions, apply price-time priority and note whether the market is order-driven.
4For clearing and settlement questions, ask who is involved: broker, clearing corporation, depository, clearing bank.
5For settlement dates, count T+1 working days from the trade day and skip weekends and market holidays.
6For index questions, check the weighting method: free-float market capitalisation, not full market cap or price.
7For calculations, write the formula, substitute values, and check units and whether to use free-float shares.
8Eliminate options that mix up clearing with settlement or give the clearing corporation a role it does not have.

Quickest way: Match the stage to the institution

When to use it: Use when a question asks who does what or which term fits a description.

Exchange: matches orders and provides the trading platform.
Broker (trading member): places your order and is the link to the exchange.
Clearing corporation: nets obligations, guarantees settlement, manages risk.
Depository and DP: hold and transfer securities in demat form.
Clearing bank: moves funds for settlement.
For indices, default to free-float market cap weighting unless the option says otherwise.

Common mistakes in Secondary Market, Trading and Settlement

Thinking the company receives money when shares are traded on the exchange.
Students mix up primary and secondary markets.
Fix: Remember that secondary trades transfer money between investors. Only primary issues raise funds for the issuer.
Using the word clearing and settlement as if they mean the same thing.
They happen close together and are often named together.
Fix: Clearing is working out and netting obligations. Settlement is the actual delivery of securities and payment.
Counting weekends and holidays when finding the T+1 settlement date.
Students count calendar days.
Fix: Count only working days on which the market is open for settlement.
Saying Sensex or Nifty is weighted by share price or full market cap.
Older textbooks describe these methods, and simple indices use them.
Fix: Remember that both Sensex and Nifty 50 use the free-float market capitalisation method.
Believing the clearing corporation only records trades and carries no risk role.
Students overlook the central counterparty function.
Fix: The clearing corporation becomes counterparty to both sides, guarantees settlement and collects margins.
Thinking an exchange sets share prices.
The exchange displays the price, so it seems to decide it.
Fix: Prices come from the interaction of buy and sell orders. The exchange provides the platform and the matching rules.

Worked examples

Example 1

A trade is executed on Tuesday in the equity cash market. There are no holidays that week. Under the T+1 rolling settlement cycle, on which day is it settled? Choose: (a) Tuesday (b) Wednesday (c) Thursday (d) Friday

Show the solution

Identify the trade day: T = Tuesday.
Apply T+1: settlement is one working day after the trade day.
The next working day after Tuesday is Wednesday.
Check there is no holiday on Wednesday. None is stated.

Answer: (b) Wednesday

Example 2

A company has 50 crore shares outstanding, of which promoters hold 60%. The share price is ₹200. What is its free-float market capitalisation, assuming all non-promoter shares are free float?

Show the solution

Total shares = 50 crore.
Promoter holding = 60% of 50 crore = 30 crore shares.
Free-float shares = 50 − 30 = 20 crore shares.
Free-float market cap = ₹200 × 20 crore = ₹4,000 crore.
For contrast, full market cap = ₹200 × 50 crore = ₹10,000 crore, which is not what the index uses.

Answer: ₹4,000 crore

Exam tips

Expect direct recall questions on roles: exchange, clearing corporation, depository, broker. Learn one line for each.
Know that Sensex and Nifty 50 use free-float market cap weighting. Options with price weighting or full market cap are traps.
Watch for the primary versus secondary trap. If the question says the issuer raises funds, it is the primary market.
In date questions, skip weekends and holidays. Read the day of the week carefully.
Answer calculation questions by writing the formula first. Check whether the question asks for free-float or total market cap.

Practice questions from Introduction to Securities Market

Secondary Market, Trading and Settlement in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Secondary Market, Trading and Settlement: frequently asked questions

How does T+1 settlement work in India?

A trade on day T is settled on the next working day. The clearing corporation nets the obligations, funds move through the clearing bank, and securities move between demat accounts through the depositories. You must count only working days.

What is the role of the clearing corporation in settlement?

It nets member obligations and acts as the central counterparty to every trade. It guarantees settlement and manages risk through margins and a guarantee fund. This protects buyers and sellers from the default of the other side.

How are Sensex and Nifty calculated?

Both use the free-float market capitalisation method. Each stock's weight depends on the market value of its publicly available shares. The current free-float market cap is compared with a base value and scaled to the base index level.

What is the difference between clearing and settlement?

Clearing is the process of calculating and netting what each member owes or is owed. Settlement is the actual transfer of money and securities that completes the trade.