NEW YORK--(BUSINESS WIRE) -- Epoch Investment Partners, Inc. ("Epoch" or the "Company"), a leading investment manager and investment adviser and the sole operating subsidiary of Epoch Holding Corporation (Nasdaq: EPHC), today announced that it has been appointed a sub-advisor to The MainStay Funds family of mutual funds. Epoch will sub-advise approximately $1.1 billion of assets in six existing portfolios which are managed by New York Life Investment Management LLC.