Tick size
Encyclopedia
In financial markets, a tick size is the smallest increment (tick) by which the price of stock
s, futures contract
s or other exchange-traded instrument can move.
Tick sizes can be fixed (e.g., USD 0.01) or vary according to the current price (common in European markets) with larger increments at higher prices. Heavily-traded stocks are given smaller tick sizes. An instrument price is always a rational number
and the tick sizes determine which numbers are permissible for a given instrument and exchange.
In Europe, Mifid
has resulted in a variety of multilateral trading facilities
with distinct tick size regimes for the same stocks. These differences mean that order routing systems must be aware of every MTF's tick size regime and adjust outgoing orders accordingly. There is now an industry effort underway to harmonise tick sizes.
Stock
The capital stock of a business entity represents the original capital paid into or invested in the business by its founders. It serves as a security for the creditors of a business since it cannot be withdrawn to the detriment of the creditors...
s, futures contract
Futures contract
In finance, a futures contract is a standardized contract between two parties to exchange a specified asset of standardized quantity and quality for a price agreed today with delivery occurring at a specified future date, the delivery date. The contracts are traded on a futures exchange...
s or other exchange-traded instrument can move.
Tick sizes can be fixed (e.g., USD 0.01) or vary according to the current price (common in European markets) with larger increments at higher prices. Heavily-traded stocks are given smaller tick sizes. An instrument price is always a rational number
Rational number
In mathematics, a rational number is any number that can be expressed as the quotient or fraction a/b of two integers, with the denominator b not equal to zero. Since b may be equal to 1, every integer is a rational number...
and the tick sizes determine which numbers are permissible for a given instrument and exchange.
In Europe, Mifid
MiFID
The Markets in Financial Instruments Directive as subsequently amended is a European Union law that provides harmonised regulation for investment services across the 30 member states of the European Economic Area...
has resulted in a variety of multilateral trading facilities
Multilateral Trading Facility
A Multilateral Trading Facility is a specific type of European financial trading system. The concept was introduced within the Markets in Financial Instruments Directive , a European financial law, and describes a trading venue that brings together buyers and sellers in a non-discretionary way...
with distinct tick size regimes for the same stocks. These differences mean that order routing systems must be aware of every MTF's tick size regime and adjust outgoing orders accordingly. There is now an industry effort underway to harmonise tick sizes.