Generally, they're not (or should not be), and its mostly hype tunnel vision (imo). Here's a link to the List of Semiconductor Fab Plants worldwide. [1] Note: This is a 1000 line table that lists production per plant at 10,000-100,000 / month for most fabs with numbers. There are a lot of other chip sources.
However, TSMC has the largest capacity worldwide. Intel's probably second for capacity. Samsung's probably third. Micron, Texas Instruments, Infineon, Epistar, and several others are lower down yet significant.
If you need small chips, out of plants already constructed, based on the data in the list, Intel and Samsung appear to have the "current" smallest node size at 7 nm. TSMC has three plants under construction with 3-5 nm node size. Intel and Samsung also have a lot of capacity in the 7-20 nm range.
Most companies are in the 20+ nm size ranges, although definite exceptions with Nanya (10 nm), SK Hynix (10 nm), nanoPHAB (10 nm), Win Semiconductor (10 nm), GlobalFoundries (12 nm), SMIC (14 nm), UMC (14 nm), Kioxia/SanDisk (15 nm).
There's also technology and product variety, although most list 3-5 for each plant, so there's a bunch of specializations.
However, TSMC has the largest capacity worldwide. Intel's probably second for capacity. Samsung's probably third. Micron, Texas Instruments, Infineon, Epistar, and several others are lower down yet significant.
If you need small chips, out of plants already constructed, based on the data in the list, Intel and Samsung appear to have the "current" smallest node size at 7 nm. TSMC has three plants under construction with 3-5 nm node size. Intel and Samsung also have a lot of capacity in the 7-20 nm range.
Most companies are in the 20+ nm size ranges, although definite exceptions with Nanya (10 nm), SK Hynix (10 nm), nanoPHAB (10 nm), Win Semiconductor (10 nm), GlobalFoundries (12 nm), SMIC (14 nm), UMC (14 nm), Kioxia/SanDisk (15 nm).
There's also technology and product variety, although most list 3-5 for each plant, so there's a bunch of specializations.
[1] https://en.wikipedia.org/wiki/List_of_semiconductor_fabricat...