I think subby's asking how to find these jobs, not ask about the existence of non-start up companies.
Yes, exactly. I know these companies exist, but from looking for the last few days, a lot of them seem to not believe so much in remote work. This makes it challenging for me, as I have a disability (degenerative nerve condition) that makes it physically quite difficult to get into an office. This constraint around remote work is what had me working for startups in the first place