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Block

A large amount of the same security bought or sold by institutional or other large investors. There is no official size designation constituting a block of securities, but a commonly used threshold is more than10,000 equity shares or more than $200,000 of debt securities.

Notes:

Blocks of securities are traded in what are called "block trades" and serve to facilitate trades involving institutional investors or other large investors who require such bulk trades to meet their needs.

See also: Block Trade, Bunching, Elephants, Iceberg Order, Institutional Investor

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Block

Large quantity of stock or large dollar amount of bonds held or traded. As a rule of thumb, 10,000 shares or more of stock and $200,000 or more worth of bonds would be described as a block.

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block

A large amount of a security, usually 10,000 shares or more.