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.
Nintendo EPD, ID, Valve
Terrible business practices aside, as a developer, Nintendo is fantastic. EPD specifically works on flagship titles and where Myamoto kisses each one before launch.
ID- groundbreaking work in the past, and I loved the recent DOOM games. Can't wait for The Dark Ages
Valve- obviously amazing devs, 3rd on this list for not releasing anything good recently (Alyx doesn't count because I can't play it because I can't afford a VR headset)
I want to say someone made a flat mod for Alyx but i'm not 100%