XBRL Filings for The MainStay Funds

The following Funds are a series of The MainStay Funds:
MainStay Candriam Emerging Markets Debt Fund, MainStay Income Builder Fund, MainStay Large Cap Growth Fund, MainStay MacKay Common Stock Fund, MainStay MacKay Convertible Fund, MainStay MacKay Infrastructure Bond Fund, MainStay MacKay High Yield Corporate Bond Fund, MainStay MacKay International Equity Fund, MainStay MacKay Tax Free Bond Fund, MainStay MacKay Unconstrained Bond Fund, MainStay MAP Equity Fund, MainStay Money Market Fund

Supplement dated February 28, 2017, for The MainStay Funds Class T Shares
Supplement dated February 28, 2017, for The MainStay Funds Class R6 Shares
Prospectus dated February 28, 2018
Supplements dated December 14, 2018, for MainStay MacKay Infrastructure Bond Fund and MainStay MacKay International Equity Fund