Who is a Charterer? Charterers freight market practitioners?

Charterer (also in Charter Party usually named in plural form as ‘charterers’) is the person who, for the purposes of the Charter Party, controls the cargo. In the case of coal, he may own the mine eg BHP Billiton, or have bought the cargo from the mine owner under a spot contract or long-term sales contract eg Glencore. In grain, it could be Bunge who sometimes ship grain from their own estates or Cargill who often buy grain from third parties. All you need to remember is that, in simple terms, the charterer controls and provides the cargo under the Charter Party.