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Paul Tracy

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Updated October 5, 2020

What is Left-Hand Side?

The left-hand side of a stock quote is the bid.

How Does Left-Hand Side Work?

A bid-ask is a quote that reflects the security’s bid price and its ask price. If, for example, the bid-ask for Company XYZ stock is $50 - $50.25, the left-hand side is $50.

The left-hand side of a quote represents the highest a person is willing to pay for the security at that time. The difference between the left-hand side and the right-hand side (the ask) is called the spread.

Typically, a trader or specialist on the floor of the New York Stock Exchange would quote the bid-ask spread as follows:

50-50-1/4
Note that online trading systems might refer to the bid-ask spread as “BxA” rather than left-hand or right-hand.

There may be several bid prices and several ask prices for a security at any point in time. However, only the best bid (that is, the highest left-hand side) and the best ask (that is, the lowest right-hand side) are used to calculate the bid-ask spread.

Why Does Left-Hand Side Matter?

It is important to remember one key aspect of bid and ask prices: Purchasers pay the right-hand side and sellers receive the left-hand side. This nuance is why securities dealers make a profit on bid-ask spreads: Their job is to buy stocks at the ask price and sell at the bid price.

Many traders and analysts scrutinize patterns in bid-ask spreads to understand what prices trigger demand for both sellers and buyers. Other traders and analysts feel that the bid-ask spread itself has little predictive value.

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