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NISM-Series-VI: Depository Operations · Depository and its Business Partners

Depository System and Dematerialisation Basics for NISM Depository Operations

Updated 11 October 2026 · Fact-checked

A depository is an institution that holds investors' securities in electronic form and enables their transfer through book entries. Dematerialisation converts physical certificates into electronic holdings. It removes risks like theft, forgery and delay. A depository works like a bank for securities, but it does not lend or take deposits of money.

Understand Depository System and Dematerialisation Basics

Before depositories, you held shares as paper certificates. To sell, you handed over the certificate with a signed transfer deed. The buyer then sent it to the company for registration. This was slow and risky.

A depository is an institution that holds securities in electronic form. It records who owns what. It transfers ownership by book entry, meaning a debit in one account and a credit in another. No paper moves. India has two depositories: NSDL and CDSL. Both are regulated by SEBI under the Depositories Act, 1996.

Dematerialisation (demat) is the process of converting physical certificates into electronic form. The certificates are cancelled and the same securities are credited to your demat account. The reverse process is rematerialisation, where electronic holdings go back to paper.

You do not deal with the depository directly. You open a demat account with a Depository Participant (DP), who is the agent of the depository. The depository, DP, issuer and registrar and transfer agent (RTA) are the business partners in the system.

A depository is often compared to a bank. The analogy helps, but the two are different. A bank holds your money and lends it out. A depository holds your securities and does not use them. The securities remain yours. The depository is only a custodian and record keeper. It cannot lend or invest your holdings.

Key formulas to remember

Depository definition
Depository = institution holding securities in electronic form and effecting transfer by book entry
Registered with SEBI under the Depositories Act, 1996. It works through Depository Participants.
Bank vs depository: what is held
Bank holds money; depository holds securities
A bank lends deposits and pays interest. A depository does not lend or invest your securities.
Demat and remat
Demat: physical → electronic; Remat: electronic → physical
Do not reverse them. Both are done through the DP.
Transfer mechanism
Transfer = debit in seller's account + credit in buyer's account
This is a book entry. No certificate or transfer deed is needed.
Access route
Investor → DP → Depository
The investor is not a direct customer of the depository.

How to solve Depository System and Dematerialisation Basics questions

Use this method for any question on depository basics, whether it is a definition, a comparison or a benefit.

  1. 1Read the question and mark the keyword: depository, DP, bank, demat, remat, physical, benefit or risk.
  2. 2Decide what is being asked: a definition, a difference or a benefit.
  3. 3For a comparison, ask what each holds: money or securities. Then ask who lends and who only safekeeps.
  4. 4For a problem of physical securities, think of theft, loss, forgery, delay, bad delivery and stamp duty on transfer.
  5. 5For a benefit, think of safety, speed, no paper, lower cost, and easy corporate benefits.
  6. 6Eliminate options that use words like always, only or guaranteed, unless the rule really says so.
  7. 7Check the final option against the definition: book entry, electronic form, DP as agent.

Quickest way: Money versus securities test

When to use it: Use this when options mix bank and depository features and time is short.

  1. Ask: does the feature involve money, lending or interest? If yes, it belongs to a bank.
  2. Ask: does it involve securities, book entry or safekeeping? If yes, it belongs to a depository.
  3. Pick the option that has no feature from the wrong side.
  4. If the option says the depository lends or invests investor securities, reject it.

Common mistakes in Depository System and Dematerialisation Basics

  • Saying the depository deals directly with investors.

    The bank analogy suggests a direct customer relationship.

    Fix: Remember the chain: investor, DP, depository. You open your account with a DP.

  • Thinking a depository lends securities like a bank lends money.

    Students stretch the bank comparison too far.

    Fix: A depository only holds and transfers securities. It does not lend or invest them. Ownership stays with you.

  • Mixing up dematerialisation and rematerialisation.

    The two terms look and sound alike.

    Fix: Demat means paper to electronic. Remat means electronic to paper. Link 'demat' with 'digital'.

  • Treating the DP as a bank or as the depository itself.

    Many DPs are banks or brokers, so roles blur.

    Fix: A DP is an agent of the depository. The same entity can be a bank and a DP, but the roles are separate.

  • Listing a benefit that does not apply, such as guaranteed returns.

    Students assume electronic holding reduces market risk.

    Fix: Demat removes paper-related risks such as theft, forgery and delay. It does not remove price risk.

  • Assuming physical securities have disappeared entirely.

    Trading in listed shares is mostly in demat form.

    Fix: Physical certificates can still exist, and rematerialisation is possible. Read the question for the exact context.

Worked examples

Example 1

Which of the following best describes the difference between a depository and a bank? (a) A depository holds securities and transfers them by book entry, while a bank holds money and lends it (b) A depository lends securities to investors for interest, while a bank only holds money (c) A depository accepts deposits of cash from investors, while a bank holds securities (d) A depository deals directly with investors, while a bank deals through agents

Show the solution
  1. Identify what each institution holds. A depository holds securities. A bank holds money.
  2. Check lending. A bank uses deposits to lend. A depository does not lend investors' securities.
  3. Test option (b): it says the depository lends securities for interest. This is wrong.
  4. Test option (c): it reverses the holdings. This is wrong.
  5. Test option (d): investors deal with the depository through a DP, not directly. This is wrong.
  6. Option (a) matches the money versus securities test.

Answer: Option (a).

Example 2

Which of the following is NOT a problem associated with holding securities in physical form? (a) Risk of theft or loss of certificates (b) Possibility of forged or fake certificates (c) Delay in transfer and registration (d) Transfer of ownership by book entry

Show the solution
  1. List the known problems of physical securities: loss, theft, forgery, delay in transfer and bad delivery.
  2. Check (a): loss and theft is a physical-form problem.
  3. Check (b): forgery is a physical-form problem.
  4. Check (c): delay in transfer is a physical-form problem.
  5. Check (d): book entry is the method used in the depository system. It is a feature of electronic holding, not a problem.

Answer: Option (d).

Exam tips

  • Expect direct definition questions. Learn the one-line definitions of depository, DP, demat and remat word for word.
  • Bank versus depository comparisons are common. Use the money versus securities test and watch for options that give the depository a lending role.
  • Questions may ask you to pick the benefit or the problem. Read whether the question says 'NOT' or 'EXCEPT' before choosing.
  • Negative marking applies in this paper at 25% of the marks for a question, so skip only if you cannot remove at least two options.
  • Know that NSDL and CDSL are the two depositories and that investors reach them through DPs.

Practice questions from Depository and its Business Partners

Depository System and Dematerialisation Basics in other exams

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

Depository System and Dematerialisation Basics: frequently asked questions

What is a depository in India?

A depository is an institution registered with SEBI that holds securities in electronic form and transfers them by book entry. India has two depositories, NSDL and CDSL. You access them through a Depository Participant.

What is the difference between a depository and a bank?

A bank holds your money and lends it to others. A depository holds your securities and does not lend or invest them. A depository only keeps records and moves ownership by book entry.

What are the benefits of the depository system over physical certificates?

It removes risks of theft, loss, forgery and bad delivery. Transfers are faster and cheaper because no paper moves. Corporate benefits such as dividends and bonus shares can be credited electronically.

What is dematerialisation?

It is the process of converting physical share certificates into electronic form. The certificates are cancelled and the same securities are credited to your demat account. You apply for it through your DP.

Do I need a DP to hold securities in demat form?

Yes. You open a demat account with a DP, which acts as the agent of the depository. You do not deal with NSDL or CDSL directly for account services.