Tier 1 companies are the suppliers of Original Equipment Manufacturer(OEM) components to the parent company/Industry that manufactures a bigger product using the smaller components. ... Tier 2 companies are the key suppliers to tier 1 companies, without supplying a product directly to OEM companies.
I have been searching for a list of top north american tier 1 technology companies, but I have not found a satisfactory list yet.
Monolithic