Is it true that there are only a few MICROCHIP manufacturing facilities in the U.S. that are worth millions?

Someone told me that there are only like 4 major ones and a lot of them being owned by IBM. IS that true that there actually aren't very many ';MICROCHIP'; factories?Is it true that there are only a few MICROCHIP manufacturing facilities in the U.S. that are worth millions?
I dont know how many there are in the US but ';fabs'; are very expensive to build and operate, so I wouldnt doubt its true.