When fascists say corporate, they do not mean companies. They mean all sub-national groups. So a trade union would be a corporation, a trade group(a group of corporations) would be a corporation, and a town would be a corporation. Fascists try to group everyone and everything into a corporation, so that they can then be grouped into a nation. The nation is the most important group, and is supposed to control the corporations.
If a business corporation is anti-nationalist, then it is out of control of the nation, and would be against fascism. That does not mean they are good, but they are not fascist.
The business councils that trump tried to implement that would have the nation telling corporations what to do would be fascism.
International fascism has always fallen apart because you cannot have multiple nations as the most important nation. This is the reason the far right in the EU has never been able to work together.