A lot is a standard unit of a financial instrument being traded. The number of units will depend on the type of financial security being traded.
The lot’s value is typically set by an exchange or a market regulator. This indicates the minimum number of units a trader can buy for a particular financial instrument.
The reason lots are used is to allow financial markets to regulate price quotes. With the regulation of prices, investors can be aware of exactly how many units they are buying and can easily assess the price they are paying for each unit.
If the order amount for a particular security is less than the usual unit of trading, then it is considered an odd lot.
Stocks: The standard lot size for the stock market is 100 shares.
Options: Here, a lot represents the number of contracts in one derivative security. Usually, an equity option contract represents 100 underlying shares of a company’s stock.
Futures: Here, lots are also known as contract sizes. The underlying asset of a futures contract could be a bond, commodity, equity, currency or more. So, the contract size will vary depending on the type of contract being traded. However, the standard contract sizes are fixed and non-negotiable.
Forex: Forex is traded in lots, with the main types being micro, mini, and standard lots. A standard lot is 100,000 units of the base currency, a mini lot is 10,000 units and a micro lot represents 1,000 units. For many traders, micro and mini lots offer the opportunity for them to invest in a currency with less funds.
Bonds: Bonds are typically issued in larger amounts. For government bonds in the US, the standard lot size is $1 million.
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