The abbreviation for the Financial Times Stock Exchange. It provides details about how companies are performing in the market. The FTSE 100 is an index that lists the top 100 UK companies and keeps a watchful eye on their share prices.
All Share Index An index containing the 900 largest companies on the London Stock Exchange. Like the FTSE100 and the FTSE250, the index is named for the Financial Times (FT) and the London Stock Exchange (SE), who are its joint owners. The FTSE-ASI and the FTSE100 are the indices generally tracked by Index Trackers.