Securities Identifiers and Reference Data

Securities identifiers make listed instruments unambiguous across exchanges, depositories, broker systems, and portfolio records. They matter when a company has multiple share classes, cross-border listings, or securities that trade in more than one venue.

Use this section with Listing Status and Security Types when the question is whether a security is admitted to trading, and with Clearing, Settlement, and Transfer Infrastructure when the question is how ownership records move after a trade.

In this section

• CUSIP: Committee on Uniform Securities Identification Procedures
  Comprehensive Overview of CUSIP: A Standardized Identification System for Securities
• ISIN: International Securities Identification Number
  A comprehensive explanation of the International Securities Identification Number (ISIN), its structure, significance, and application in global financial markets.
• Q Ticker Symbol
  An in-depth look at the 'Q' ticker symbol used to designate companies in bankruptcy proceedings on the Nasdaq.
• Stock Exchange Daily Official List (SEDOL): Comprehensive Definition and Overview
  A detailed exploration of the Stock Exchange Daily Official List (SEDOL), a seven-character ID code for securities listed on the London Stock Exchange and other UK exchanges. Understand its structure, significance, historical context, and application in financial markets.