Learn English – n informal term for the “best company in an industry”

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I am looking for an informal term or an expression to define the best company (the more competitive and successful) within a specific industry.

A similar example is the expression "killer application" which is often used to refer to most successful software applications.
A formal expression I often see is "industry leader", but I need an informal or slang one.

Sample usage:

IBM used to be the……of the IT industry in the past.

Best Answer

I think the term you're looking for is market leader.

A market leader is a company that has the largest market share in an industry, and which can use its dominance to affect the competitive landscape and direction the market takes.

Source: Market Leader Definition | Investopedia http://www.investopedia.com/terms/m/market-leader.asp#ixzz42aZkmi6a

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