An individual who makes a profit by taking advantage of inefficiencies in financial markets

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What is an Arbitrageur?

An arbitrageur is an individual who earns profits by taking advantage of inefficiencies in financial markets. Arbitrage opportunities arise when an asset is priced differently between multiple markets at the same time. Such price differences are inefficiencies resulting from deficiencies in the marketplace.


A successful arbitrageur profits by simultaneously purchasing financial assets at a lower price and selling them at a higher price, pocketing the difference. By taking advantage of the inefficiencies, arbitrageurs can earn risk-free profits because the financial assets being traded are equivalent. In turn, the actions of the arbitrageur result in greater market efficiency by causing asset prices to equalize.


  • An arbitrageur is an individual who profits through inefficiencies in the financial markets.
  • Arbitrage trades are generally risk-free because the transactions occur simultaneously to ensure prices do not change.
  • When enough arbitrage trades are conducted, the mispriced assets between two markets will equalize to maximize market efficiency.

How Does Arbitrage Work?

The concept of arbitrage is quite simple. By taking advantage of price differences in equivalent assets, an arbitrageur can make risk-free profits by buying low and selling high.

Suppose you can buy avocados from a farm at $1.00 each. Soon after, you sell the avocados to a local restaurant at $1.50 each. In this case, you earn a profit of 50 cents for each avocado you sell.

Financial arbitrage is similar, but the prices of financial assets can change on a moment’s notice. To take advantage of price differences in assets like stocks, the transactions must occur simultaneously to ensure that the prices do not change during the transaction.

How Does Arbitrage Work

What Does an Arbitrageur Do?

An arbitrageur uses trading strategies designed to profit from small differences in the price of equivalent assets. The assets can be stocks, bonds, currencies, commodities, or any other financial instruments that can be bought and sold. Deficiencies in financial markets, such as delays in updating stock prices, can result in prime opportunities for an arbitrageur.

To conduct arbitrage, an investor purchases stocks on one exchange while simultaneously selling the same stock on another exchange. If the transaction happens simultaneously, there is no chance that the stock price will change during the transaction. By selling the same stock at a higher price, the arbitrageur can earn a risk-free profit equal to the difference between the mispriced assets.

Due to the incremental price differences and time-sensitive nature, most arbitrage trades involve institutional investors, such as hedge funds or banks. For most retail investors who trade stocks on their smartphones, arbitrage trades are difficult because of the significant technical resources required to trade simultaneously between various stock exchanges.

Also, the price difference between the two financial assets can be minuscule. Large sums of money are required to take advantage of small price differences to ensure that arbitrage trades are profitable and worthwhile.

Effects of Arbitrage

By taking advantage of market inefficiencies, arbitrageurs help the financial system by causing prices to equalize through a system of supply and demand. When an arbitrageur buys an asset from cheaper markets and sells the same asset in more expensive markets, the demand for the asset in the cheaper market will increase, causing prices to go up. In contrast, the more expensive market will see an increase in supply, causing prices to decrease.

If enough arbitrage trades are conducted, the prices of assets between the two markets will equalize and maximize overall efficiency. When market prices are equalized with no potential for arbitrage, it is known as an arbitrage equilibrium.

Arbitrageur Example

Differences in stock prices typically result from companies that are dual-listed on multiple stock exchanges. Let’s say that shares of Company XY are priced at $165.40 per share on the New York Stock Exchange (NYSE). On the Toronto Stock Exchange (TSX), Company XY shares are priced at $165.75 per share (all prices are converted to USD).

In such a case, an arbitrageur can make a profit of $0.35 for every share they can trade. If the arbitrageur can purchase 50,000 shares from the TSX, they can make a profit of $17,500 by reselling the shares on the NYSE.

More Resources

CFI offers the Commercial Banking & Credit Analyst (CBCA)™ certification program for those looking to take their careers to the next level. To keep learning and developing your knowledge base, please explore the additional relevant resources below:

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