The following is a non exhaustive list.

MSFT owns…

ZeniMax:

Bethesda (Elder Scrolls, Fallout)

id Software (Doom, Wolfenstein, Quake)

Arkane (Dishonored)

Activision/Blizzard:

Blizzard (World of Warcraft, StarCraft, Diablo)

Treyarch/InfinityWard (Call of Duty)

Other Studios (Guitar Hero, Tony Hawk Pro Skater, Candy Crush)

…

Rare (Goldeneye 007, Perfect Dark, Banjo Kazooie, Sea of Thieves)

343 (Halo)

The Coalition (Gears of War)

Mojang (Minecraft)

Ninja Theory (Hellblade: Senua’s Sacrifice, Devil May Cry)

Playground Games (Forza)

Undead Labs (State of Decay)

Obsidian Entertainment (KotoR)

Full list here: https://www.pcgamer.com/every-game-and-studio-microsoft-now-owns/

really? it was all over the news as the largest acquisition on the planet for a couple of months last year, lol

https://wikipedia.org/wiki/Acquisition_of_Activision_Blizzard_by_Microsoft