arbitrageur
noun
ar·bi·tra·geur ˌär-bə-(ˌ)trä-ˈzhər 
variants or arbitrager
ˈär-bə-ˌträ-zhər
: one that practices arbitrage
Example Sentences
Recent Examples on the Web Most infamously, Milken and Dennis Levine, Black’s colleague on the mergers and acquisitions desk, went to prison for insider trading, as did their co-conspirator, the arbitrageur Ivan Boesky. 
Bob Ivry, Town & Country, 3 June 2021 But there is a straightforward way to minimize the discount: Make the holding company as similar to the underlying asset as possible so that arbitrageurs can directly compare them. Stephen Wilmot, WSJ, 24 June 2019 An arbitrageur could profit by selling short the stocks in New York and buying the futures contract. Burton G. Malkiel, WSJ, 18 Sep. 2017 Levine implicated Ivan Boesky, an arbitrageur, who then implicated Martin Siegel (HBS ’71), formerly of Kidder Peabody but then working for Drexel Burnham Lambert. Duff Mcdonald, Newsweek, 6 Apr. 2017 Stewart’s book brought the reader inside the room of the most private meetings and discussions among the likes of the famed arbitrageur Ivan Boesky and the financier Michael Milken, as well as those prosecuting them, led by Rudy Giuliani. Andrew Ross Sorkin, New York Times, 7 Feb. 2017
Bob Ivry, Town & Country, 3 June 2021 But there is a straightforward way to minimize the discount: Make the holding company as similar to the underlying asset as possible so that arbitrageurs can directly compare them. Stephen Wilmot, WSJ, 24 June 2019 An arbitrageur could profit by selling short the stocks in New York and buying the futures contract. Burton G. Malkiel, WSJ, 18 Sep. 2017 Levine implicated Ivan Boesky, an arbitrageur, who then implicated Martin Siegel (HBS ’71), formerly of Kidder Peabody but then working for Drexel Burnham Lambert. Duff Mcdonald, Newsweek, 6 Apr. 2017 Stewart’s book brought the reader inside the room of the most private meetings and discussions among the likes of the famed arbitrageur Ivan Boesky and the financier Michael Milken, as well as those prosecuting them, led by Rudy Giuliani. Andrew Ross Sorkin, New York Times, 7 Feb. 2017 Word History
Etymology
arbitrage + -eur (as in entrepreneur) or -er entry 2
Note: Despite appearances, arbitrageur is not borrowed from French, which uses the derivative arbitragiste.
First Known Use
1870, in the meaning defined above
Legal Definition
arbitrageur
noun
ar·bi·tra·geur ˌär-bə-ˌträ-ˈzhər
variants or arbitrager
ˈär-bə-ˌträ-zhər
: one that practices arbitrage