Understanding How Demat Works

Where your shares are stored

If you invest through different apps or brokers (for example, Zerodha, Groww, or Upstox), your shares are not kept on each app's servers. Instead, the actual ownership records are stored with one of India’s two central depositories:

• CDSL (Central Depository Services Limited)
• NSDL (National Securities Depository Limited)

Your broker or investment platform acts as an interface — the depositories are the secure, central record-keepers.

The Consolidated Account Statement (CAS)

The Consolidated Account Statement (CAS) gives you a single view of all your holdings and transactions across brokers and platforms.

It shows:

• Your holdings — shares, ETFs, mutual funds, and more
• A detailed history of transactions made across your investment accounts

CAS is usually emailed to you periodically.
If you need a fresh copy, you can request it anytime from the NSDL or CDSL websites.

Security: How your data is protected

The central depositories are essentially robust servers that store digital records for demat accounts. Several layers of security keep your data safe:

• High-security facilities: Data centers are physically protected against intrusion
• Encryption & segregation: Records are isolated and encrypted to prevent tampering
• Real-time backups: Data is duplicated across multiple locations as trades happen
• Audits & regulation: Systems and procedures are audited and supervised by SEBI

These measures ensure that the depositories operate with bank-grade security and regulatory oversight.

Trading account vs Demat account — an easy analogy

Think of the two accounts like this:

🏪 Trading Account

The shop where buying and selling happen.

🏬 Demat Account

The warehouse where your securities are stored safely.

When you buy a share, the trade executes in your trading account and the share is transferred into your demat account for safekeeping.
When you sell, the share moves from the demat account back to the trading account to be sold.

Key takeaway

Your demat account is a secure digital vault maintained by CDSL or NSDL.
Your trading account is the market interface you use to buy and sell.

Tools like the Consolidated Account Statement (CAS) make it easy to track everything in one place, even if you use multiple investment platforms.