scalper

/ˈskælpər/
noun
  1. A person who buys tickets for an event (such as a concert or sports game) and then resells them at a much higher price.
    • The scalper was selling concert tickets for three times their original price outside the stadium.
    • The police arrested several scalpers who were illegally reselling tickets near the arena.
    • Many fans complain that scalpers make it impossible to buy affordable tickets online.
  2. A person who buys and sells stocks or other assets quickly to make small profits on price changes.
    • The scalper made a small profit on each trade but earned a lot by doing many trades.
    • Day traders often act as scalpers, taking advantage of tiny price movements.
    • A scalper might buy and sell the same stock dozens of times in a single day.