After doing the design and testing of CPU, your company may want to mass produce the CPUs. There are many "semi-conductor foundries" in the world who will do that for you for a nominal competetive cost. There are companies in USA, Germany, UK, Japan, Taiwan, Korea and China.
TMSC (Taiwan) is the "largest independent foundry" in the world. You may want to shop around and you will get the best rate for a very high volume production (greater than 100,000 CPU units).
Foundry companies invested very heavily in the infra-structure and building plants runs in several millions of dollars! Silicon foundry business will grow from $7 billion to $36 billion by 2004 (414% increase!!). More integrated device manufacturers (IDMs) opt to outsource chip production verses adding wafer-processing capacity.
Independent foundries currently produce about 12% of the semiconductors in the world, and by 2004, that share will more than double to 26%.
The "Big Three" pure-play foundries are -- Taiwan Semiconductor Manufacturing Co. (TSMC), United Microelectronics Corp. (UMC), and Chartered Semiconductor Manufacturing Ltd. Pte.--collectively account for 69% of today's silicon foundry volume, but their share is expected to grow to 88% by 2004.
There are hundreds of foundries in the world (too numerous to list). Some of them are -
List of CHIP foundry companies