The January transfer window is in full swing, with sides desperate to save themselves from relegation and others keen to creep further up the Premier League table.
So does it actually work? Who are the big spenders? And which players tend to move more in the winter window than others?
Here, with help from bookmaker bwin, Sportsmail brings you the surprising stats of the January window.
WHICH CLUBS SPEND THE MOST AND LEAST?
An unlikely leader and two teams in profit to start with.
The table below shows every current Premier League club's average annual January net spend since the winter window was introduced in 2002-03.