Senior executives from CityAM are visiting media agencies to gauge potential advertiser response to the extra copies, which will also include a small increase in its advertising rates.
The expanded distribution is set to be introduced at the start of May.
According to ABC figures, CityAM's latest distribution was 98,573 in February.
The business paper is currently distributed in 47 stations in Surrey and 20 in Kent, but this will rise significantly because of the increase in distribution.
CityAM's readership is currently made up of professionals in the City, Canary Wharf and other high business concentration areas.