institutional investor

noun2

1. •
   A (usually large) organization that invests (usually large amounts of) money, often on behalf of others for whom it is a fiduciary (such as workers building their savings toward their retirement).

   • The state employees' pension fund is the main institutional investor with a stake in that company.
2. •
   Any of the individual persons whose money is invested by such an organization.

   • This level of risk does not appeal to institutional investors who are worried about a nosedive of their 401(k) balances.