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THE MAINSTAY FUNDS

MAINSTAY FUNDS TRUST

Supplement dated June 10, 2024 (“Supplement”) to the

Summary Prospectuses and Prospectuses dated August 28, 2023, as supplemented,

Summary Prospectuses and Prospectuses dated February 28, 2024, as supplemented,

Summary Prospectus and Prospectus dated March 29, 2024,

Prospectus dated May 28, 2024, and

Statement of Additional Information (“SAI”) dated February 28, 2024, as amended May 28, 2024

Capitalized terms and certain other terms used in this Supplement, unless otherwise defined in this Supplement, have the meanings assigned to them in the Summary Prospectuses, Prospectuses, and SAI.

The Board of Trustees of The MainStay Funds and MainStay Funds Trust (each a “Trust”) considered and approved the following changes, which will occur on or around August 28, 2024. For each of the Funds of each respective Trust:

The name of each Trust will change as follows:



CURRENT TRUST NAME		NEW TRUST NAME
The MainStay Funds		New York Life Investments Funds
MainStay Funds Trust		New York Life Investments Funds Trust

The name of each Fund will change as follows:



CURRENT FUND NAME		NEW FUND NAME
MainStay Balanced Fund		NYLI Balanced Fund
MainStay Candriam Emerging Markets Debt Fund		NYLI Candriam Emerging Markets Debt Fund
MainStay Candriam Emerging Markets Equity Fund		NYLI Candriam Emerging Markets Equity Fund
MainStay CBRE Global Infrastructure Fund		NYLI CBRE Global Infrastructure Fund
MainStay CBRE Real Estate Fund		NYLI CBRE Real Estate Fund
MainStay Conservative ETF Allocation Fund		NYLI Conservative ETF Allocation Fund
MainStay Conservative Allocation Fund		NYLI Conservative Allocation Fund
MainStay Cushing^® MLP Premier Fund		NYLI Cushing^® MLP Premier Fund
MainStay Epoch Capital Growth Fund		NYLI Epoch Capital Growth Fund
MainStay Epoch Global Equity Yield Fund		NYLI Epoch Global Equity Yield Fund
MainStay Epoch International Choice Fund		NYLI Epoch International Choice Fund
MainStay Epoch U.S. Equity Yield Fund		NYLI Epoch U.S. Equity Yield Fund
MainStay Equity Allocation Fund		NYLI Equity Allocation Fund
MainStay Equity ETF Allocation Fund		NYLI Equity ETF Allocation Fund
MainStay Fiera SMID Growth Fund		NYLI Fiera SMID Growth Fund
MainStay Floating Rate Fund		NYLI Floating Rate Fund
MainStay Growth Allocation Fund		NYLI Growth Allocation Fund
MainStay Growth ETF Allocation Fund		NYLI Growth ETF Allocation Fund
MainStay Income Builder Fund		NYLI Income Builder Fund
MainStay MacKay Arizona Muni Fund		NYLI MacKay Arizona Muni Fund
MainStay MacKay California Tax Free Opportunities Fund		NYLI MacKay California Muni Fund
MainStay MacKay Colorado Muni Fund		NYLI MacKay Colorado Muni Fund
MainStay MacKay Convertible Fund		NYLI MacKay Convertible Fund
MainStay MacKay High Yield Corporate Bond Fund		NYLI MacKay High Yield Corporate Bond Fund
MainStay MacKay High Yield Municipal Bond Fund		NYLI MacKay High Yield Muni Bond Fund
MainStay MacKay New York Tax Free Opportunities Fund		NYLI MacKay New York Muni Fund
MainStay MacKay Oregon Muni Fund		NYLI MacKay Oregon Muni Fund
MainStay MacKay Short Duration High Income Fund		NYLI MacKay Short Duration High Income Fund
MainStay MacKay Short Term Municipal Fund		NYLI MacKay Short Term Muni Fund
MainStay MacKay Strategic Bond Fund		NYLI MacKay Strategic Bond Fund
MainStay MacKay Strategic Municipal Allocation Fund		NYLI MacKay Strategic Muni Allocation Fund
MainStay MacKay Tax Free Bond Fund		NYLI MacKay Tax Free Bond Fund
MainStay MacKay Total Return Bond Fund		NYLI MacKay Total Return Bond Fund
MainStay MacKay U.S. Infrastructure Bond Fund		NYLI MacKay U.S. Infrastructure Bond Fund

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CURRENT FUND NAME		NEW FUND NAME
MainStay MacKay Utah Muni Fund		NYLI MacKay Utah Muni Fund
MainStay Moderate Allocation Fund		NYLI Moderate Allocation Fund
MainStay Moderate ETF Allocation Fund		NYLI Moderate ETF Allocation Fund
MainStay Money Market Fund		NYLI Money Market Fund
MainStay PineStone Global Equity Fund		NYLI PineStone Global Equity Fund
MainStay PineStone International Equity Fund		NYLI PineStone International Equity Fund
MainStay PineStone U.S. Equity Fund		NYLI PineStone U.S. Equity Fund
MainStay S&P 500 Index Fund		NYLI S&P 500 Index Fund
MainStay Short Term Bond Fund		NYLI Short Term Bond Fund
MainStay U.S. Government Liquidity Fund		NYLI U.S. Government Liquidity Fund
MainStay WMC Growth Fund		NYLI WMC Growth Fund
MainStay WMC International Research Equity Fund		NYLI WMC International Research Equity Fund
MainStay WMC Small Companies Fund		NYLI WMC Small Companies Fund
MainStay Winslow Large Cap Growth Fund		NYLI Winslow Large Cap Growth Fund
MainStay WMC Enduring Capital Fund		NYLI WMC Enduring Capital Fund
MainStay WMC Value Fund		NYLI WMC Value Fund

MainStay S&P 500 Index Fund

The day‑to‑day investment management services provided by IndexIQ Advisors LLC (“IndexIQ Advisors”), an indirect, wholly owned subsidiary of New York Life Insurance Company (“NYL”), to MainStay S&P 500 Index Fund will be transferred to New York Life Investment Management LLC (“NYLIM”), which is also an indirect, wholly owned subsidiary of NYL. NYLIM is the investment manager of this Fund. NYLIM will assume the duties and obligations of IndexIQ Advisors and the personnel at IndexIQ Advisors who currently provide investment services to this Fund will continue to provide the same investment management services to this Fund through NYLIM. The Subadvisory Agreement between NYLIM and IndexIQ Advisors will be terminated.

All references to IndexIQ Advisors as subadvisor in the Summary Prospectus, Prospectus and SAI for this Fund are deleted in their entirety.

PLEASE RETAIN THIS SUPPLEMENT FOR YOUR FUTURE REFERENCE.

MS16MULTIa‑06/24

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