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C - Municipal corporation
D - Union Territories
E - Company, Statutory Corporation, Banking Company
F - Mutual funds including UTI
Maximum issuer types can be 35 (A to Z and 0 to 8.)
The characters fourth to seventh represents company identity. The first three
characters are numeric and the fourth character is an alpha character.
The eighth and the ninth character represent security type for a given issuer. Both
the characters are numeric.
Security Type Code
Equity 01
Non Voting Equity 02
Convertible Preference Shares 03
Non Convertible Preference Shares 04
Mutual Fund Units – Close ended 05
Mutual Fund Units – Open ended 06
Secured Debentures 07
Unsecured Debentures 08
Regular Return Bonds – Promissory Notes 09
Floating Rate Bonds 10
Deep Discount Bonds 11
Step Discount Bonds 12
Warrants 13
The tenth and the eleventh characters are serially issued for each security of the
issuer entering the system.
The last number is double-add-double check digit.

I hope it will help