The British company was founded in 2010, with their website from 2011 showing this logo at the top. It's using the Gill Sans font.
After Google acquired DeepMind in 2014, the company name in the logo has been moved from below the icon to the right and the font has been replaced with a geometric font, Proxima Nova.
In late August 2014 a new loop appeared on the website with a modern, flat design and a new color palette consisting of washed-out blue tones, replacing the more 3D logo that had been in use ever since the foundation of the company.
Used until November that year, this is the first time we see the company name along with the Google logo next to it.
Following Google's redesign a few months earlier, this logo is replacing the classic font combination with Google's custom Product Sans to bring it in line with the rest of its products.
In late 2016 the "Google" prefix was removed again, and the logo now only shows "DeepMind" again.