No, they are not marxists.
They are FASCISTS.
Fascism is a form of socialism where the state and private business meld together, but the means of production stay in private hands.
A global government run by mega corporations would be about as pure a form of fascism as you could get.
Yes, but it is also a much older form of governance - that of fiefdoms. The globalists envision a future where every labor unit is property, not of a castle, but of a corporation. You have no rights under a corporation.