What Is an ISIN and How to Apply for It (New Share Issue)

01What Is an ISIN?

What is an ISIN? An ISIN (International Securities Identification Number) is a 12-character alphanumeric code that uniquely identifies a single security anywhere in the world. It is defined by the international standard ISO 6166, which means an ISIN for shares in India is built the same way as one in any other country, and no two securities share the same code.

The 12 characters are always made up of three parts:

• A 2-letter country code at the start. For India this is always IN. It tells you where the security was issued.
• Nine alphanumeric characters in the middle. These identify the issuing company and the specific security (the security type and series), so the same company can have several ISINs.
• One check digit at the end. This single digit is calculated from the other 11 characters and is used to catch typing or data-entry errors.

Put together, an Indian ISIN looks like INE123A01010. Reading it left to right: IN is the country code, the next nine characters (E123A0101) identify the issuer and the security, and the final character (0) is the check digit. You do not need to memorise the maths; the point is simply that the code is structured, not random, and that one ISIN maps to exactly one security type. This is the same code that will later appear on every demat statement, allotment and transfer for those shares.

02Why Every Company Needs One

The simple rule is: no ISIN, no demat. Shares can only be held electronically against an ISIN, so a company cannot dematerialise its existing shares, and cannot allot fresh shares in demat form, until the depository has allotted an ISIN for that security. The ISIN is the very first technical step in the whole dematerialisation process.

For private companies this is no longer optional. Under Rule 9B of the Companies (Prospectus and Allotment of Securities) Rules, every private company that is not a small company must issue securities only in dematerialised form and must facilitate the demat of all its existing securities. (Listed public companies and unlisted public companies were already covered by earlier rules.) Once Rule 9B applies, a holder cannot be allotted new shares, or transfer existing ones, unless they are in demat form, and that is impossible without an ISIN. We cover the eligibility and deadlines in detail in the Rule 9B guide.

Beyond compliance, an ISIN underpins all the practical benefits of demat: no risk of lost, stolen or forged certificates, instant paperless transfers, easier pledging and ESOP allotments, and a cleaner cap table that speeds up due diligence. The ISIN is what makes every one of those possible.

03How to Apply for an ISIN

How to apply for an ISIN is the question most founders actually have, and the first thing to know is that the company does not apply directly. The application is made by a SEBI-registered RTA (Registrar and Transfer Agent) to one of India’s two depositories, NSDL and/or CDSL. The company appoints the RTA; the RTA handles the depository interface. Common RTA names include KFin Technologies, MUFG Intime (formerly Link Intime), Cameo and Bigshare. You can read more about choosing one in the RTA guide.

The steps

1. Appoint a SEBI-registered RTA. Pass a board resolution and engage the RTA who will apply for the ISIN and act as your interface with the depository.
2. Compile the document set (listed below) for the specific class of security you want to dematerialise.
3. The RTA applies to NSDL and/or CDSL. The application goes in for that one security type. A company can use either depository, or both; cost and RTA support usually drive the choice.
4. The depository verifies and allots the ISIN. This typically takes about 2 to 4 weeks if the documents are complete and the security details are clean.
5. Execute the tripartite agreement (company, RTA and depository) so shares can be dematerialised and corporate actions processed under the new ISIN.

Documents the RTA will need

• Certificate of Incorporation of the company.
• MOA and AOA (the Articles should not restrict dematerialisation; amend them first if they do).
• Board resolution approving demat and the appointment of the RTA.
• Latest audited financial statements.
• Net-worth certificate from a chartered accountant.
• Register of members showing current holdings.
• KYC and PAN of the directors.

The cleaner this set is, the faster the ISIN comes through. The most common cause of delay is a mismatch between the security details in the application and the company’s own records, which we return to in section 6.

04A Separate ISIN for Each Security

Because an ISIN identifies one security type, each distinct security needs its own ISIN. A company that has issued more than one kind of instrument will hold more than one ISIN at the same time, and each is applied for separately through the RTA.

So a startup that has issued Equity Shares plus two classes of preference shares (say from two funding rounds) will end up with three ISINs, one for each. When that company later raises again and issues a new class, it applies for another ISIN before it can allot those shares in demat form. Keeping the list of active ISINs mapped against your cap table is part of running a clean equity register.

05New Share Issue and the Corporate Action

Once an ISIN exists, allotting fresh shares in demat form runs through what the depositories call a corporate action. After the company passes the allotment (a fresh issue, a rights issue, a bonus or shares against an ESOP exercise), the RTA initiates a corporate action through the depository to credit the new shares to the allottees’ demat accounts. Nobody hands out paper certificates; the shares simply appear in each allottee’s account under the relevant ISIN.

To trigger this, the company or its RTA submits a corporate action form to the depository, along with the board or committee resolution and the allotment details. This is the document that tells the depository exactly what to credit, to whom, and under which ISIN.

What the corporate action form captures

• The ISIN of the security being credited, so the shares land in the correct security.
• The type of corporate action (a fresh allotment, rights, bonus and so on).
• Each allottee’s demat account details: the DP ID and client ID that identify the account.
• The number of shares to be credited to each allottee.
• The allotment date and the resolution reference.

The RTA verifies these details against the register of members, and the depository then credits the shares to each demat account. The allottees see the new holding in their accounts, and the company’s register and the depository records stay in step. If you want the full end-to-end sequence, from ISIN to credit, see the dematerialisation process guide.

06Common ISIN Mistakes

Most ISIN problems are not exotic; they come from small data errors that the depository then enforces strictly. Watch for these.

• Wrong security details in the application. Describing the security type, class or series incorrectly when applying means the ISIN gets attached to the wrong thing, which is painful to unwind once shares are credited.
• Mismatch with the register of members. If the holdings, names or quantities in the ISIN data and the corporate action do not match the company’s register, the depository can reject the entry or credit it wrongly.
• Using the wrong ISIN for a credit. Crediting a new allotment under the ISIN of a different class (for example Equity Shares instead of a preference series) puts the shares in the wrong security entirely.
• Stale director KYC or PAN. Out-of-date KYC in the application is a common cause of the depository sending the file back, which adds weeks.
• Articles that still restrict demat. If the AOA were never amended, the application can stall; fix the Articles before you apply.

If shares are ever credited under the wrong ISIN or to the wrong account, do not panic, but act quickly: raise it with your DP and the company’s RTA, and the depository can reverse and re-credit under the correct ISIN. We cover the full fix in the wrong ISIN guide.

07Frequently Asked Questions