THQ president Brian Farrell said the firm is "delighted" with the launch figures and that it is already fulfilling re-orders for the game at retailers.
EVP core games Danny Bilson added: "Homefront's excellent multiplayer experience, combined with our commitment to dedicated servers, make this a must-have purchase for gamers
"Due to the strong and growing demand for Homefront's multiplayer, we continue to add dedicated server capacity.
"We are confident that the large-scale multiplayer maps, featuring 32 players, vehicles, infantry and drones, will continue to be a major draw for the huge audience of FPS gamers looking for a new experience over the coming months."
Yesterday it was revealed that THQ's stock value dropped by 21% following mixed reviews of the game.
Homefront will be available on Xbox 360, PlayStation 3 and PC in the UK this Friday, March 18.
> Click here to read our preview of Homefront