"key clients" is correct and appropriate for use in written English.
For example, "Our team's top priority is to ensure satisfaction with our key clients."
They were both key clients," Mr Schofield said.
Your "contact-to-close" rates with key clients and prospects?
It'll just depend on what we see from our key clients.
"I always felt she was in love with the key clients she had," Mr. Bowles mused.
Key clients include IDEO, Hall Capital, Sofinnova Ventures, Nokia Growth Partners, Tea Collection and many others.
The next morning he called some of the bank's key clients to talk about prospective business.
Implement assignment systems that ensure equal access to challenging work and key clients.
Lowe London, which handles the Stella Artois account, has lost a number of key clients in the past two years.
In the early nineties, near the end of his time at Tangerine, Ive worked with two key clients.
She recently stepped back from running the agency to take on a consultancy role advising key clients.
Quickly, it called key clients and trading partners, giving them unprecedented detail on its ample liquidity position.
