Microsoft Buys Bethesda: EVERY Studio Xbox Now Owns
6. Zenimax Online Studios
Notable Games: Elder Scrolls Online
Founded over a decade ago, this online subsidiary of ZeniMax seems to have only really hit its stride in the last few years.
Their main purpose was to build a massive MMO in Bethesda's Elder Scrolls universe. After a long development cycle, they released Elder Scrolls Online in 2014 to a mixed reception. Some of this was due to a messy and buggy launch, while some of it due to it being an underwhelming and barebones game.
Regardless, the company turned things around by supporting the hell out of the title. Hundreds of patches and an endless series of incredible expansion packs has made the game a championed title in the MMO genre with a dedicated and passionate fanbase.