arbitrageur

An individual or broker who engages in arbitrage. American Banker Glossary

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One who profits from the differences in price when the same, or extremely similar, security, currency, or commodity is traded on two or more markets. The arbitrageur profits by simultaneously purchasing and selling these securities to take advantage of pricing differentials (spreads) created by market conditions. Bloomberg Financial Dictionary

See: risk arbitrage, convertible arbitrage, index arbitrage, and international arbitrage. Bloomberg Financial Dictionary

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An investor who trades in the markets with the intention of making riskless, guaranteed profits by exploiting market inefficiencies. For example, if the same index contract is traded in two different exchanges, it should trade at the same price in both exchanges. If the prices are not the same, an arbitrageur will buy at the cheaper price and immediately sell at the more expensive price in the other market, making a guaranteed profit. Dresdner Kleinwort Wasserstein financial glossary

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arbitrageur ar‧bi‧tra‧geur [ˌɑːbtrɑːˈʒɜː ǁ ˌɑːrbtrɑːˈʒɜːr] also ar‧bi‧tra‧ger [ˈɑːbtrɑːʒə ǁ ˈɑːrbtrɑːʒər] especially AmE noun [countable]

FINANCE a person or organization whose job is arbitrage; = ARB:

• The company's shares rose as investors and arbitrageurs bought in anticipation of a takeover bid.

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arbitrageur UK US (also arbitrager) /ˌɑːbɪtrɑːˈʒɜː^r/ US  /ˈɑːrbɪtrɑːʒɚ/ noun [C] (also arb) FINANCE

► someone who buys something, such as shares or currency, in one place and sells them in another where they can get a higher price at the same time: »

Traders said that overseas arbitrageurs were buying the stock in London in the hope of selling it at a profit in Johannesburg.