secret partner

I will be your secret partner, and supply the funds to start with.

So long as a secret partner keeps the fact of his membership from the public, of course he will not be sued as a member.

A secret partner is one who keeps the fact of his membership in the partnership from the public.

The term, dormant partner, is sometimes used synonymously with secret partner.

His old school friend, Ballantyne, forced into bankruptcy the printing firm in which Scott was a secret partner.

A member of a limited partnership can never be a secret partner, since the terms of a limited partnership must be published.

Under this reorganization—with Evans as a secret partner—the Children continued to act with their customary success.