• Quote flooding is a tactic used by high frequency traders that involves placing and canceling a large number of orders in an extremely short time frame.

  • The purpose of filling quotes is to gain a price advantage over competitors as it causes them to waste time processing these orders.
  • Initially, quote filling was considered one of the main reasons for the “sudden crash” of 2010, as a result of which the Dow Jones Industrial Average (DJIA) fell 1,000 points in a matter of minutes.