In this order for me:
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Capcom
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Squaresoft (Enix)
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Konami
The big three I had in my regular playing rotation growing up. And while over the years all three have fell off in various ways from their golden age of gaming status, I still keep coming back to them.
Biohazard, Final Fantasy, Castlevania, shame though that Castlevania is dead in the water, save for a good anime adaption.
Klei Entertainment because Don't Starve was realy good, probably the best single player survival game ever imo. I think they had gold with Invisible inc right when the XCOM era was booming, shame they didn't continue with it for whatever reason.
Urban Games(Transport fever franchise) because they seem to be the only ones that truly understand how to make a modern OpenTTD type game. Transport Fever 2 is realy good, the only "flaw" is its realy bare bones with a bad economy, but just building stuff its the best.
Also years worth of patching, they deserve it.
AMPLITUDE Studios, the endless universe is very unique and interesting, even though their new game is a mixed bag, looking back I do like their community centered style.
Klei has some heaters. Griftlands is great but got slept on ;_;