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.
Honorable mention for Koei with their many many iterations of Warriors and Romance series with all the more or less fun spinoffs.
Next one for Bioware, some of the best RPG’s ever, RIP.