The total number of investor accounts at the depositories stood at about 2.15 crore in September 2013.
National Securities Depository Ltd (NSDL) and Central Depository Services Ltd (CDSL) allow investors to deposit securities by opening an account.
Securities like shares, debentures, bonds of investors are held in electronic form (dematerialised form) at the depositories.
Individually, the total number of investor accounts at NSDL was 1.34 crore as of September-end 2014 as against 1.29 crore in the same period last year.
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Together, the total number of investor accounts stood at 2.25 crore in September, an addition of 10,30,949 accounts from the same month in 2013.
Month-on-month, the cumulative number of investor accounts in both the depositories rose by 1.7 lakh in September over the preceding month.
Meanwhile, data showed that the total value of securities in dematerialised form at the depositories stood at more than Rs 121 lakh crore at the end of September, a rise of nearly 64 per cent over the same period in 2013.
Besides, the cumulative quantity of securities in demat form stood at 1.05 lakh crore in September as compared to 44,241 crore in the year-ago period.
The volume of demat securities on NSDL and CDSL stood at 86,185 crore and Rs 18,870 crore, respectively as on September this year.
The depositories hold investors' securities in electronic form through their registered depository participants.
These securities include common equity shares, preference shares, debentures, mutual fund units, among others.