GTA 5 sales could hit 25million before year's end

Grand Theft Auto 5 has now sold 15 million copies worldwide, with 25 million expected to be sold before the end of 2013.

That's according to Cowen & Company analyst Doug Creutz, who wrote a research note to investors earlier.

"Based on the $1B three-day figure Take-Two disclosed, we believe the game has already sold through at least 15MM units.

"For a game to sell 60% of its first year units in just three days would be abnormally high; we estimate that Call of Duty sells about 45-50% of its first year units in its first week at retail.

"However, for now we are assuming that GTA5 sales will be extremely front-loaded due to high gamer anticipation, and will also have a shorter sales tail given the launch of next-gen consoles in November."