Browse Definitions:

FTSE 100

Contributor(s): Jane McPherson

FTSE 100 is an index of the financial performance of the100 largest companies in the UK. The index, which is updated continuously, is considered a barometer of the stock market in the UK and a reflection of the overall health of the UK economy.

The companies in the FTSE 100 are selected by the FTSE Group, which owned 50% by the Financial Times magazine and 50% by the London Stock Exchange. The acronym is derived from Financial Times and Stock Exchange (and is pronounced “footsie”).

To be considered an FTSE 100 company, a company must report its quarterly performance to the FTSE Group, must be listed on the London Stock Exchange, and must meet certain other requirements such as level of liquidity. The FTSE also monitors a majority of the bonds held and given by these companies. The FTSE group then applies a formula which considers the daily stock performance and capital positions of the 100 companies to deliver a FTSE 100 index number for the day.

Companies that are not large enough to be in the top FTSE 100 may be classified in the FTSE 250 (the next 250 largest companies not including the FTSE 100) or the FTSE 500 (the next 500 largest companies not including the FTSE 100 or FTSE 250.)

This was last updated in January 2012

Continue Reading About FTSE 100

Start the conversation

Send me notifications when other members comment.

By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

Please create a username to comment.


File Extensions and File Formats

Powered by:


  • risk map (risk heat map)

    A risk map, also known as a risk heat map, is a data visualization tool for communicating specific risks an organization faces. A...

  • internal audit (IA)

    An internal audit (IA) is an organizational initiative to monitor and analyze its own business operations in order to determine ...

  • pure risk (absolute risk)

    Pure risk, also called absolute risk, is a category of threat that is beyond human control and has only one possible outcome if ...


  • cloud ecosystem

    A cloud ecosystem is a complex system of interdependent components that all work together to enable cloud services.

  • cloud services

    Cloud services is an umbrella term that may refer to a variety of resources provided over the internet, or to professional ...

  • uncloud (de-cloud)

    The term uncloud describes the action or process of removing applications and data from a cloud computing platform.


  • federated identity management (FIM)

    Federated identity management (FIM) is an arrangement that can be made among multiple enterprises to let subscribers use the same...

  • cross-site scripting (XSS)

    Cross-site scripting (XSS) is a type of injection security attack in which an attacker injects data, such as a malicious script, ...

  • firewall

    In computing, a firewall is software or firmware that enforces a set of rules about what data packets will be allowed to enter or...




  • bad block

    A bad block is an area of storage media that is no longer reliable for storing and retrieving data because it has been physically...

  • all-flash array (AFA)

    An all-flash array (AFA), also known as a solid-state storage disk system, is an external storage array that uses only flash ...

  • volume manager

    A volume manager is software within an operating system (OS) that controls capacity allocation for storage arrays.


  • hybrid hard disk drive (HDD)

    A hybrid hard disk drive is an electromechanical spinning hard disk that contains some amount of NAND Flash memory.