When ethnic groups occupy a middle status between dominant and subordinate groups, they are referred to as

Middleman Minorities

Explanation:

A minority middleman is a minority group of which the primary occupations connect producers with consumers: traders, money lenders, etc.

A middleman minority, though likely experiencing prejudice, doesn't have an "extreme inferior" position in society.

Sociologists such as Blalock and Bonacich have developed the definition of "middleman minority" since the 1960s, but it is also used by political scientists and economists.