How about Ashby Computers and Graphics Ltd. (ACG) who published as Ultimate: Play the Game? (Sabrewulf, Nightlore, Alien8) who became Rare(Killer Instinct) who were amalgamated into Microsoft.(Something called Windows)
Then there was Gremlin Graphics (Thing on a Spring, Monty on the Run, Zool) who absorbed DMA Design (Grand Theft Auto, Lemmings) and were absorbed by Infogrammes (Unreal Tournament) which had also absorbed Epic Games and Digital Interactive (Unreal), as well as Ocean(Almost any good C64 game), Accolade, Beam Software, Hasbro and Atari....and then...uh...seriously, read up on it. Infogrammes [http://en.wikipedia.org/wiki/Infogrames] was bedhopping like only the French can.(!)
Then there was Codemasters (Dizzy) that came from Mastertronic (The Last V8) and went on to be... Codemasters (Lord of the Rings Online, Colin Mcrae's Rally)