Of course, I am speaking about ... Roxxon
It is only a juridical person and the owners & CEO have often changed but, no matter what, Roxxon is one of the recurring adversaries of Tony Stark & Iron Man.
Some theories even imply that the corporation might have killed Howard & Maria Stark.
I just finished binging Altered Carbon and I once again noted the absolute hatred of the oligarchy present in modern writing. It is clear to me, more than ever, that Iron Man's enemies need to be richer than he is. It shouldn't even be competitive.