Meanwhile, Jelly Bean, KitKat and Lollipop, the three previous versions of Android, are powering the majority of Google-powered devices currently, at 23%, 35.5% and 34.1%, respectively.
Google says the figures were put together from phones and tablets that visited its Google Play Store during a 7-day period ending February 1, 2016.
Android Marshmallow off to a slow start
The Android Marshmallow adoption rate has been slow because of all the complicated requirements of the fragmented operating system. It's always been that way compared to Apple's iOS software.
Carriers and each Android smartphone and tablet maker need to test the new OS before rolling it out to their Android devices, which can take a few months. It's especially painful in the carrier-dominate US.
The meager Marshmallow adopter should begin to pick up in the coming weeks and months, as a range of smartphone makers have committed to updating to the new OS.
Sign up for Black Friday email alerts!
Get the hottest deals available in your inbox plus news, reviews, opinion, analysis and more from the TechRadar team.