oligopolist

oligopoly +‎ -ist

oligopolist (plural oligopolists)

1. A member of an oligopoly; one of a small number of sellers with undue influence over a market.
   • 2006, Edwin Black, chapter 2, in Internal Combustion‎:

     But through the oligopoly, charcoal fuel proliferated throughout London's trades and industries. By the 1200s, brewers and bakers, tilemakers, glassblowers, pottery producers, and a range of other craftsmen all became hour-to-hour consumers of charcoal. This only magnified the indispensable nature of the oligopolists.

   • 2009 June 5, David Gillen, “In Ratings Agencies, Investors Still Trust”, in New York Times‎:

     “As a classic oligopolist, Moody’s earns exceedingly high margins while paying only the needed lip service to product quality.”