finder

noun | find·er

1. : one that finds the finder of lost property has a right to it as against the world, except against the true owner —McDonald v. Railway Express Agency, 81 S.E.2d 525 (1954)

2. : one that for a fee discovers a financial opportunity, passes it on to another, and may act as a go-between for but does not participate in subsequent negotiations between the involved parties — compare broker