Board Lot

DEFINITION of 'Board Lot'

A standardized number of shares defined by a stock exchange as a trading unit. In most cases, this means 100 shares. The purpose of a board lot is to avoid "odd lots" and to facilitate easier trading. It's more difficult for a broker to find a buyer for, say, 17 shares, than if everybody agrees to trade in 100 share lots.

BREAKING DOWN 'Board Lot'

For example, a stock exchange might define one board lot as equaling 1,000 shares for stock priced under $1, and 100 shares for shares of more than $1. The thinking is that standardization increases liquidity thus lowering spreads and making the market more efficient for everybody.

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