'dominant supplier' is a correct phrase that can be used in written English.
A dominant supplier is a company that holds the greatest share of a particular market. For example, Microsoft is a dominant supplier in the computer software market.
BSkyB is by far the dominant supplier of digital TV.
Russia's position as dominant supplier of natural gas to Europe gives it a significant geopolitical advantage.
Yet, despite its problems in the marketplace, Microsoft remained the dominant supplier of operating systems.
Despite being the dominant supplier of disk drives, Seagate struggled to maintain profits in a competitive market.
It has begun offering Web-based software like word processing and spreadsheets — areas where Microsoft is the dominant supplier.
Cisco has long been the dominant supplier of networking equipment like switches and routers for corporate data centers.
By the same token, dominant suppliers like Gazprom are likely to see their leverage weaken if they try to use it too often.
For years, that studio's dominant suppliers have been Imagine Entertainment, owned by Ron Howard and Brian Grazer, and Working Title Films, whose movies include "Nanny McPhee".
But the message to fish farmers, the dominant suppliers of salmon in this country, was unmistakably clear: stop feeding your penned-up salmon the fish meal that seems to be causing the problem.
Colombia and Mexico have become the dominant suppliers of heroin to the United States, supplanting Asia, in a trend that experts and the authorities fear could offset American-backed successes in a campaign against drugs that has focused mostly on cocaine.
This upsurge in innovation stimulates investment and invigorates the economy, as successful participants enjoy fat profits, set standards, kill off weaker rivals and establish themselves as the dominant suppliers.
