The decision, which was mutual between Nummela and the company's Board of Directors, is effective immediately.
Nummela became a part of HMD Global as CEO-elect from Microsoft along with 4,500 other employees.
HMD Global, the business vehicle set up specifically to create and market Nokia-branded mobile devices, has announced that its CEO Arto Nummela has left the company "with immediate effect".
Latest news20/7/17: HMD Global's official website in China has posted an official image of the Nokia 8, which suggests that it could launch later today. It is also selling the new Nokia 3310 feature phone purely based on the nostalgia factor.
This is not the first time that we are having a look at Nokia's upcoming flagship.
As mentioned above, the Nokia 8 is pegged for a July 31 launch.
With Nummela stepping down as HMD Global's CEO, it remains unclear whether this would affect the company's current goals and or change its ongoing Nokia Android smartphones strategy. The smartphone will be up for grabs in different color options - Steel, Blue, Gold/Blue and Gold/Copper. We have also seen the whole design of the device even we have witnessed the press renders.
The Nokia 8 will get dual cameras, as well as Qualcomm's Snapdragon 835 chipset, making it one of the most powerful phones of the year already.
Yesterday, Nokia's Chinese website "accidentally" put up an image of the Nokia 8 showcasing the device in all of its glory.
The Nokia 8 is tipped to run on Android 7.1 Nougat and sport a 5.3-inch QHD display.