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cik0000787441:S000006899Summary15Member cik0000787441:S000006899Member cik0000787441:ICEBofAUSConvertibleIndexMember 2021-10-31 2021-10-31 iso4217:USD pure 2022-02-28 MGHAX MGHHX MGHBX MHYCX MGHIX MHCAX MHHIX MKHCX MYHCX MHYIX MHHRX MHYRX MHYTX MHYSX MHHSX MASAX MSYDX MASBX MSICX MSDIX MSIRX MSDJX MSYEX MGVAX MGVNX MCSGX MGVCX MGOIX MGVDX MTBAX MKINX MKTBX MTFCX MTSPX MTBIX MTBDX MMAXX MKTXX MKMXX MSCXX MIPXX MTRAX MTINX MKTRX MCTRX MTOIX MTXRX MTXVX MTODX MTISX MCOAX MCINX MCSVX MCCVX MCNVX MainStay Candriam Emerging Markets Debt Fund Investment Objective The Fund seeks total return. Fees and Expenses of the Fund The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the MainStay Funds. This amount may vary depending on the MainStay Fund in which you invest. In addition, different financial intermediary firms and financial professionals may impose different sales loads and waivers. More information about these and other discounts or waivers is available from your financial professional, in the "Information on Sales Charges" section starting on page 133 of the Prospectus and Appendix A – Intermediary-Specific Sales Charge Waivers and Discounts, and in the "Alternative Sales Arrangements" section on page 142 of the Statement of Additional Information. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the MainStay Funds. 50000 Shareholder Fees (fees paid directly from your investment) 0.0450 0.0400 0 0 0 0 0 0.0500 0.0100 0 Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) 0.0070 0.0070 0.0070 0.0070 0.0070 0.0025 0.0025 0.0100 0.0100 0 0.0037 0.0075 0.0075 0.0075 0.0036 0.0132 0.0170 0.0245 0.0245 0.0106 -0.0017 -0.0017 -0.0017 -0.0017 -0.0021 0.0115 0.0153 0.0228 0.0228 0.0085 Example The Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated whether or not you redeem all of your shares at the end of those periods (except as indicated with respect to Class B and Class C shares). The Example reflects Class B and Class C shares converting into Investor Class shares in years 9-10; expenses could be lower if you are eligible to convert to Class A shares instead. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects the contractual fee waiver and/or expense reimbursement arrangement, if applicable, for the current duration of the arrangement only. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Assuming no redemption Assuming redemption at end of period 562 549 231 731 231 331 87 833 898 747 1047 747 747 316 1125 1271 1290 1490 1290 1290 564 1954 2315 2588 2588 2588 2588 1275 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 112% of the average value of its portfolio. 1.12 Principal Investment Strategies Under normal circumstances, the Fund invests at least 80% of its assets (net assets plus any borrowings for investment purposes) in fixed income securities of issuers in emerging markets. Generally, an issuer of a security is considered to be an emerging market issuer based on the issuer’s “country of risk,” as determined by a third-party service provider such as Bloomberg. Candriam Luxembourg S.C.A., the Fund’s Subadvisor, has discretion to determine the countries considered to be emerging market countries, including taking into consideration a variety of factors such as the development of a country’s financial and capital markets and inclusion in an index, such as the J.P. Morgan Emerging Market Bond Index, considered by the Subadvisor to be representative of emerging markets. The securities in which the Fund invests may be denominated in foreign currency. The debt securities in which the Fund invests may consist of securities that are rated below investment grade. Below investment grade securities are generally securities that receive low ratings from a nationally recognized statistical rating organization (“NRSRO”) (such as securities rated lower than BBB- and Baa3), or if unrated, are deemed to be of comparable quality by the Subadvisor. Securities rated below investment grade by a NRSRO are commonly referred to as “high yield securities” or “junk bonds.” If NRSROs assign different ratings to the same security, the Fund will use the higher rating for purposes of determining the security's credit quality. The Fund may invest in fixed income securities of any duration or maturity.The Fund's principal investments include sovereign, quasi-sovereign and corporate Eurobonds. The Fund may invest in floating rate notes and inverse floating rate notes. The Fund may also invest in derivative instruments, such as forward commitments, futures, options and swap agreements to try to enhance returns or reduce the risk of loss by hedging certain of its holdings. The Fund may invest up to 20% of its total assets in swaps, including credit default swaps and credit default swap indices. The Fund may buy and sell currency on a spot basis, buy foreign currency options, and enter into foreign currency forward contracts. These techniques may be used for any purpose, including to seek to increase the Fund's return. Investment Process: The Subadvisor identifies investment opportunities by deploying a relative value focused investment approach. The approach consists of three primary layers of analysis. The first layer assesses medium-term sovereign creditworthiness and sets up the basis for identifying the second and third layer investment opportunities, which are relative country (second layer) and instrument (third layer) investment opportunities. The Subadvisor also considers key fundamental macro-economic drivers such as growth and inflation dynamics, internal and external imbalances as well as structural reform and political risk trends. The investment approach is aware of environmental, social and governance (“ESG”) risks as ESG factors are explicitly integrated in the sovereign creditworthiness analysis. The Subadvisor may avoid investments in sovereign or corporate issuers where the combination of fundamental and ESG risks are not appropriately reflected in valuations. In addition, the Subadvisor implements a Controversial Activity Exclusion policy related to companies and industries involved with the production of coal, tobacco products, chemical, biological or white phosphorus weapons, and gambling. The Subadvisor may sell a security if it believes the security will no longer contribute to meeting the investment objective of the Fund. Principal Risks You can lose money by investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. The investments selected by the Subadvisor may underperform the market in which the Fund invests or other investments. The Fund may receive large purchase or redemption orders which may have adverse effects on performance if the Fund were required to sell securities, invest cash or hold a relatively large amount of cash at times when it would not otherwise do so. The principal risks of investing in the Fund are summarized below. Market Risk: The value of the Fund’s investments may fluctuate because of changes in the markets in which the Fund invests, which could cause the Fund to underperform other funds with similar investment objectives and strategies. Such changes may be rapid and unpredictable. From time to time, markets may experience periods of stress for potentially prolonged periods that may result in: (i) increased market volatility; (ii) reduced market liquidity; and (iii) increased redemptions of Fund shares. Such conditions may add significantly to the risk of volatility in the net asset value of the Fund's shares. Portfolio Management Risk: The investment strategies, practices and risk analyses used by the Subadvisor may not produce the desired results. The Subadvisor may give consideration to certain ESG criteria when evaluating an investment opportunity. The application of ESG criteria may result in the Fund (i) having exposure to certain securities or industry sectors that are significantly different than the composition of the Fund's benchmark; and (ii) performing differently than other funds and strategies in its peer group that do not take into account ESG criteria or the Fund's benchmark. In addition, the Subadvisor's exclusionary ESG screen may result in the Fund forgoing opportunities to buy certain securities when it might otherwise be advantageous to do so, or selling securities for ESG reasons when it might be otherwise disadvantageous for it to do so.Yield Risk: There can be no guarantee that the Fund will achieve or maintain any particular level of yield.Debt Securities Risk: The risks of investing in debt or fixed-income securities include (without limitation): (i) credit risk, e.g., the issuer or guarantor of a debt security may be unable or unwilling (or be perceived as unable or unwilling) to make timely principal and/or interest payments or otherwise honor its obligations, or changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may affect the value of the Fund’s investments; (ii) maturity risk, e.g., a debt security with a longer maturity may fluctuate in value more than one with a shorter maturity; (iii) market risk, e.g., low demand for debt securities may negatively impact their price; (iv) interest rate risk, e.g., when interest rates go up, the value of a debt security generally goes down, and when interest rates go down, the value of a debt security generally goes up (long-term debt securities are generally more susceptible to interest rate risk than short-term debt securities); and (v) call or prepayment risk, e.g., during a period of falling interest rates, the issuer may redeem a security by repaying it early, which may reduce the Fund’s income if the proceeds are reinvested at lower interest rates.Interest rate risk is the risk that the value of the Fund’s investments in fixed income or debt securities will change because of changes in interest rates. There is a risk that interest rates across the financial system may change, possibly significantly and/or rapidly. Changes in interest rates or a lack of market participants may lead to decreased liquidity and increased volatility in the fixed-income or debt markets, making it more difficult for the Fund to sell its fixed-income or debt holdings. Decreased liquidity in the fixed-income or debt markets also may make it more difficult to value some or all of the Fund’s fixed-income or debt holdings. For most fixed-income investments, when market interest rates fall, prices of fixed-rate debt securities rise. However, when market interest rates fall, prices of certain variable and fixed-rate debt securities may be adversely affected (i.e., falling interest rates bring the possibility of prepayment risk, as an instrument may be redeemed before maturity). Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, may result in heightened market volatility and may detract from Fund performance to the extent the Fund is exposed to such interest rates and/or volatility. Other factors that may affect the value of debt securities include, but are not limited to, economic, political, public health, and other crises and responses by governments and companies to such crises. Not all U.S. government debt securities are guaranteed by the U.S. government—some are backed only by the issuing agency, which must rely on its own resources to repay the debt. The Fund's yield will fluctuate with changes in short-term interest rates.Foreign Securities Risk: Investments in foreign (non-U.S.) securities may be riskier than investments in U.S. securities. Foreign regulatory regimes and securities markets can have less stringent investor protections and disclosure standards and less liquid trading markets than U.S. regulatory regimes and securities markets, and can experience political, social and economic developments that may affect the value of the Fund's investments in foreign securities. Foreign securities may also subject the Fund's investments to changes in currency rates. Changes in the value of foreign currencies may make the return on an investment increase or decrease, unrelated to the quality or performance of the investment itself. Emerging Markets Risk: The risks related to investing in foreign securities are generally greater with respect to securities of companies that conduct their business activities in emerging markets or whose securities are traded principally in emerging markets. The risks of investing in emerging markets are elevated under current conditions and include: (i) smaller trading volumes for such securities and limited access to investments in the event of market closures (including due to local holidays), which result in a lack of liquidity and in greater price volatility; (ii) less government regulation, which could lead to market manipulation, and less extensive, transparent and frequent accounting, auditing, recordkeeping, financial reporting and other requirements, which limit the quality and availability of financial information; (iii) the absence of developed legal systems, including structures governing private or foreign investment or allowing for judicial redress (such as limits on rights and remedies available to the Fund) for investment losses and injury to private property; (iv) loss resulting from problems in share registration and custody; (v) sensitivity to adverse political or social events affecting the region where an emerging market is located; (vi) particular sensitivity to economic and political disruptions, including adverse effects stemming from recessions, depressions or other economic crises, or reliance on international or other forms of aid, including trade, taxation and development policies; and (vii) the nationalization of foreign deposits or assets.Sovereign Debt Risk: The debt securities issued by sovereign entities may decline as a result of default or other adverse credit event resulting from a sovereign debtor's unwillingness or inability to repay principal and pay interest in a timely manner, which may be affected by a variety of factors, including its cash flow situation, the extent of its reserves, the availability of sufficient foreign exchange on the date a payment is due, the relative size of the debt service burden to the economy as a whole, the sovereign debtor's policy toward international lenders, and the political constraints to which a sovereign debtor may be subject. Sovereign debt risk is increased for emerging market issuers.High-Yield Securities Risk: Investments in high-yield securities or non-investment grade securities (commonly referred to as "junk bonds") are considered speculative because investments in such securities present a greater risk of loss than investments in higher quality securities. Such securities may, under certain circumstances, be less liquid than higher rated securities. These securities pay investors a premium (a high interest rate or yield) because of the potential illiquidity and increased risk of loss. These securities can also be subject to greater price volatility. In times of unusual or adverse market, economic or political conditions, these securities may experience higher than normal default rates.Floating Rate Notes and Variable Rate Notes Risk: Floating and variable rate notes provide for a periodic adjustment in the interest rate paid on the securities. The rate adjustment intervals may be regular and range from daily up to annually, or may be based on an event, such as a change in the prime rate. Floating and variable rate notes may be subject to greater liquidity risk than other debt securities, meaning that there may be limitations on the Fund's ability to sell the securities at any given time. Securities with floating interest rates generally are less sensitive to interest rate changes, but may decline in value if their interest rates do not rise as much or as fast as interest rates in general. Floating rate loans and other similar debt obligations that lack financial maintenance covenants or possess fewer or contingent financial maintenance covenants and other financial protections for lenders and investors (sometimes referred to as “covenant-lite” loans or obligations) are generally subject to more risk than investments that contain traditional financial maintenance covenants and financial reporting requirements. The terms of many floating rate notes and other instruments are tied to the London Interbank Offered Rate (“LIBOR”) or the Secured Overnight Financing Rate ("SOFR"), which function as reference rates or benchmarks. Certain LIBOR tenors were discontinued at the end of 2021, but the most widely used LIBOR tenors may continue to be provided on a representative basis until mid-2023. There remains uncertainty regarding the future use of LIBOR and the nature of any replacement rate, such as SOFR. As such, the potential effect of a transition away from LIBOR tenors may cause increased volatility and illiquidity in the markets for instruments with terms tied to such LIBOR tenors or other adverse consequences, such as decreased yields and reduction in value, for these instruments. This may adversely affect the Fund and its investments in such instruments.Derivatives Risk: Derivatives are investments whose value depends on (or is derived from) the value of an underlying instrument, such as a security, asset, reference rate or index. Derivative strategies may expose the Fund to greater risk than if it had invested directly in the underlying instrument and often involve leverage, which may exaggerate a loss, potentially causing the Fund to lose more money than it originally invested and would have lost had it invested directly in the underlying instrument. For example, if the Fund is the seller of credit protection in a credit default swap, the Fund effectively adds leverage to its portfolio and is subject to the credit exposure on the full notional value of the swap. Derivatives may be difficult to sell, unwind and/or value. Derivatives may also be subject to counterparty risk, which is the risk that the counterparty (the party on the other side of the transaction) on a derivative transaction will be unable or unwilling to honor its contractual obligations to the Fund. Futures may be more volatile than direct investments in the instrument underlying the contract, and may not correlate perfectly to the underlying instrument. Futures and other derivatives also may involve a small initial investment relative to the risk assumed, which could result in losses greater than if they had not been used. Due to fluctuations in the price of the underlying instrument, the Fund may not be able to profitably exercise an option and may lose its entire investment in an option. To the extent that the Fund writes or sells an option, if the decline in the value of the underlying instrument is significantly below the exercise price in the case of a written put option or increase above the exercise price in the case of a written call option, the Fund could experience a substantial loss. Forward commitments entail the risk that the instrument may be worth less when it is issued or received than the price the Fund agreed to pay when it made the commitment. The use of foreign currency forwards may result in currency exchange losses due to fluctuations in currency exchange rates or an imperfect correlation between portfolio holdings denominated in a particular currency and the forward contracts entered into by the Fund. Swaps may be subject to counterparty credit, correlation, valuation, liquidity and leveraging risks. Swap transactions tend to shift a Fund's investment exposure from one type of investment to another and may entail the risk that a party will default on its payment obligations to the Fund. Additionally, applicable regulators have adopted rules imposing certain margin requirements, including minimums on uncleared swaps, which may result in the Fund and its counterparties posting higher margin amounts for uncleared swaps. Certain standardized swaps are subject to mandatory central clearing and exchange trading. Central clearing, which interposes a central clearinghouse to each participant’s swap, and exchange trading are intended to reduce counterparty credit risk and increase liquidity but neither makes swap transactions risk-free. Derivatives may also increase the expenses of the Fund. Liquidity and Valuation Risk: The Fund’s investments may be illiquid at the time of purchase or liquid at the time of purchase and subsequently become illiquid due to, among other things, events relating to the issuer of the securities, market events, operational issues, economic conditions, investor perceptions or lack of market participants. The lack of an active trading market may make it difficult to sell or obtain an accurate price for a security. If market conditions or issuer specific developments make it difficult to value securities, the Fund may value these securities using more subjective methods, such as fair value pricing. In such cases, the value determined for a security could be different than the value realized upon such security's sale. As a result, an investor could pay more than the market value when buying shares or receive less than the market value when selling shares. This could affect the proceeds of any redemption or the number of shares an investor receives upon purchase. The Fund is subject to the risk that it could not meet redemption requests within the allowable time period without significant dilution of remaining investors' interests in the Fund. To meet redemption requests or to raise cash to pursue other investment opportunities, the Fund may be forced to sell securities at an unfavorable time and/or under unfavorable conditions, which may adversely affect the Fund’s performance. These risks are heightened for fixed-income instruments because of the current low interest rate environment.Currency Risk: Changes in the value of foreign (non-U.S.) currencies relative to the U.S. dollar may adversely affect the Fund’s investments in foreign currencies or in securities that trade in, and receive revenues in, or in derivatives that provide exposure to, foreign currencies. These changes in value can make the return on an investment go up or down, entirely apart from the quality or performance of the investment itself. The Subadvisor may seek to reduce currency risk by hedging all or part of the exposure to various foreign currencies of the Fund’s assets by engaging in hedging transactions, including swaps, futures, forward currency contracts and other derivatives. The Subadvisor may from time to time attempt to hedge all or a portion of the perceived currency risk by engaging in similar hedging transactions. However, these transactions and techniques may not always work as intended, and in certain cases the Fund may be worse off than if it had not engaged in such hedging practices. In addition, certain market conditions may make it impossible or uneconomical to hedge against currency risk.Money Market/Short-Term Securities Risk: To the extent the Fund holds cash or invests in money market or short-term securities, the Fund may be less likely to achieve its investment objective. In addition, it is possible that the Fund's investments in these instruments could lose money. You can lose money by investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. Past Performance The following bar chart and table indicate some of the risks of investing in the Fund. The bar chart shows you how the Fund's calendar year performance has varied over time. Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown. The average annual total returns table shows how the Fund's average annual total returns (before and after taxes) compare to those of a broad-based securities market index. The Fund has selected the JPMorgan EMBI Global Diversified Index as its primary benchmark. The JPMorgan EMBI Global Diversified Index is a market capitalization weighted, total return index tracking the traded market for U.S. dollar-denominated Brady Bonds, Eurobonds, traded loans and local market debt instruments issued by sovereign and quasi-sovereign entities. Index returns reflect no deductions for fees, expenses or taxes, except for foreign withholding taxes where applicable.Performance data for the classes varies based on differences in their fee and expense structures. Performance data is not shown for classes with less than one calendar year of performance. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Please visit newyorklifeinvestments.com/funds for more recent performance information.Effective February 28, 2017, the Fund's principal investment strategies changed. Effective June 21, 2019, the Fund's subadvisor, investment objective and principal investment strategies changed. The performance in the bar chart and table prior to those dates reflects the Fund’s prior subadvisor, investment objective and principal investment strategies. The following bar chart and table indicate some of the risks of investing in the Fund. Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown. The Fund has selected the JPMorgan EMBI Global Diversified Index as its primary benchmark. Performance data is not shown for classes with less than one calendar year of performance. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. newyorklifeinvestments.com/funds Annual Returns, Class I Shares(by calendar year 2012-2021) <table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="89%"><tr style="font-size:1pt;"><td style="width:61.54%;"> </td><td style="width:29.49%;"> </td><td style="width:8.98%;"> </td></tr><tr><td colspan="2" style="vertical-align:bottom; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000;">Best Quarter</td><td style="vertical-align:top; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; font-size:1pt;"> </td></tr><tr><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">2020, Q2</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">15.27</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">%</td></tr><tr><td colspan="2" style="vertical-align:bottom; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.25pt; border-top-style:solid; border-top-color:#000000;">Worst Quarter</td><td style="vertical-align:top; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.25pt; border-top-style:solid; border-top-color:#000000; font-size:1pt;"> </td></tr><tr><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">2020, Q1</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">-18.72</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">%</td></tr></table> Best Quarter 2020-06-30 0.1527 Worst Quarter 2020-03-31 -0.1872 Average Annual Total Returns (for the periods ended December 31, 2021) 2007-08-31 -0.0458 0.0354 0.0410 -0.0656 0.0149 0.0179 -0.0269 0.0184 0.0214 1998-06-01 -0.0916 0.0229 0.0334 2008-02-28 -0.0896 0.0201 0.0311 1998-06-01 -0.1044 0.0185 0.0281 1998-09-01 -0.0691 0.0216 0.0281 JPMorgan EMBI Global Diversified Index -0.0180 0.0465 0.0528 After-tax returns are calculated using the highest individual federal marginal income tax rates in effect at the time of each distribution or capital gain or upon the sale of Fund shares, and do not reflect the impact of state and local taxes. In some cases, the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns are not relevant if you hold your shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns shown are for Class I shares. After-tax returns for the other share classes may vary. After-tax returns are calculated using the highest individual federal marginal income tax rates in effect at the time of each distribution or capital gain or upon the sale of Fund shares, and do not reflect the impact of state and local taxes. In some cases, the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns are not relevant if you hold your shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns shown are for Class I shares. After-tax returns for the other share classes may vary. MainStay MacKay High Yield Corporate Bond Fund Investment Objective The Fund seeks maximum current income through investment in a diversified portfolio of high-yield debt securities. Capital appreciation is a secondary objective. Fees and Expenses of the Fund The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the MainStay Funds. This amount may vary depending on the MainStay Fund in which you invest. In addition, different financial intermediary firms and financial professionals may impose different sales loads and waivers. More information about these and other discounts or waivers is available from your financial professional, in the "Information on Sales Charges" section starting on page 133 of the Prospectus and Appendix A – Intermediary-Specific Sales Charge Waivers and Discounts, and in the "Alternative Sales Arrangements" section on page 142 of the Statement of Additional Information. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the MainStay Funds. 50000 Shareholder Fees (fees paid directly from your investment) 0.0450 0.0400 0 0 0 0 0 0 0 0 0 0 0.0500 0.0100 0 0 0 0 0 0 Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) 0.0053 0.0053 0.0053 0.0053 0.0053 0.0053 0.0053 0.0053 0.0053 0.0053 0.0025 0.0025 0.0100 0.0100 0 0 0.0025 0.0050 0 0.0050 0.0017 0.0030 0.0030 0.0030 0.0017 0.0027 0.0027 0.0027 0.0003 0.0030 0.0095 0.0108 0.0183 0.0183 0.0070 0.0080 0.0105 0.0130 0.0056 0.0133 Example The Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated whether or not you redeem all of your shares at the end of those periods (except as indicated with respect to Class B and Class C shares). The Example reflects Class B and Class C shares converting into Investor Class shares in years 9-10; expenses could be lower if you are eligible to convert to Class A shares instead. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects the contractual fee waiver and/or expense reimbursement arrangement, if applicable, for the current duration of the arrangement only. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Assuming no redemption Assuming redemption at end of period 543 506 186 686 186 286 72 82 107 132 57 135 739 730 576 876 576 576 224 255 334 412 179 421 952 972 990 1190 990 990 390 444 579 713 313 729 1564 1664 1951 1951 1951 1951 871 990 1283 1568 701 1601 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 40% of the average value of its portfolio. 0.40 Principal Investment Strategies The Fund, under normal circumstances, invests at least 80% of its assets (net assets plus any borrowings for investment purposes) in high-yield corporate debt securities, including all types of high-yield domestic and foreign corporate debt securities that are rated below investment grade by a nationally recognized statistical rating organization (“NRSRO”) or that are unrated but are considered to be of comparable quality by MacKay Shields LLC, the Fund's Subadvisor.Securities that are rated below investment grade by NRSROs (such as securities rated lower than BBB- and Baa3) are commonly referred to as “high-yield securities” or "junk bonds." If NRSROs assign different ratings to the same security for purposes of determining the security's credit quality, the Fund will use the middle rating when three NRSROs rate the security. For securities where only two NRSROs rate the security, the Fund will use the higher rating. If only one rating is available for a security, the Fund will use that rating.The Fund's high-yield investments may also include convertible corporate securities, loans and loan participation interests. The Fund may invest up to 20% of its net assets in common stocks and other equity-related securities. The Fund may hold cash or invest in short-term instruments during times when the Subadvisor is unable to identify attractive high-yield securities. The Fund may invest in derivatives, such as futures, options and swap agreements to seek enhanced returns or to reduce the risk of loss by hedging certain of its holdings.In times of unusual or adverse market, economic or political conditions, the Fund may invest without limit in investment grade securities and may invest in U.S. government securities or other high quality money market instruments. Periods of unusual or adverse market, economic or political conditions may exist in some cases, for up to a year or longer. To the extent the Fund is invested in cash, investment grade debt or other high quality instruments, the yield on these investments tends to be lower than the yield on other investments normally purchased by the Fund. Although investing heavily in these investments may help to preserve the Fund's assets, it may not be consistent with the Fund's primary investment objective and may limit the Fund's ability to achieve a high level of income.Investment Process: The Subadvisor seeks to identify investment opportunities by analyzing individual companies and evaluating each company's competitive position, financial condition, and business prospects. The Fund invests in companies in which the Subadvisor has judged that there is sufficient asset coverage—that is, the Subadvisor's subjective appraisal of a company's value compared to the value of its debt, with the intent of maximizing risk-adjusted income and returns.The Subadvisor may sell a security if it believes the security will no longer contribute to meeting the investment objectives of the Fund. In considering whether to sell a security, the Subadvisor may evaluate, among other things, the price of the security and meaningful changes in the issuer's financial condition and competitiveness. Principal Risks You can lose money by investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. The investments selected by the Subadvisor may underperform the market in which the Fund invests or other investments. The Fund may receive large purchase or redemption orders which may have adverse effects on performance if the Fund were required to sell securities, invest cash or hold a relatively large amount of cash at times when it would not otherwise do so. The principal risks of investing in the Fund are summarized below. Market Risk: The value of the Fund’s investments may fluctuate because of changes in the markets in which the Fund invests, which could cause the Fund to underperform other funds with similar investment objectives and strategies. Such changes may be rapid and unpredictable. From time to time, markets may experience periods of stress for potentially prolonged periods that may result in: (i) increased market volatility; (ii) reduced market liquidity; and (iii) increased redemptions of Fund shares. Such conditions may add significantly to the risk of volatility in the net asset value of the Fund's shares. Portfolio Management Risk: The investment strategies, practices and risk analyses used by the Subadvisor may not produce the desired results. Yield Risk: There can be no guarantee that the Fund will achieve or maintain any particular level of yield.Debt Securities Risk: The risks of investing in debt or fixed-income securities include (without limitation): (i) credit risk, e.g., the issuer or guarantor of a debt security may be unable or unwilling (or be perceived as unable or unwilling) to make timely principal and/or interest payments or otherwise honor its obligations, or changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may affect the value of the Fund’s investments; (ii) maturity risk, e.g., a debt security with a longer maturity may fluctuate in value more than one with a shorter maturity; (iii) market risk, e.g., low demand for debt securities may negatively impact their price; (iv) interest rate risk, e.g., when interest rates go up, the value of a debt security generally goes down, and when interest rates go down, the value of a debt security generally goes up (long-term debt securities are generally more susceptible to interest rate risk than short-term debt securities); and (v) call or prepayment risk, e.g., during a period of falling interest rates, the issuer may redeem a security by repaying it early, which may reduce the Fund’s income if the proceeds are reinvested at lower interest rates.Interest rate risk is the risk that the value of the Fund’s investments in fixed income or debt securities will change because of changes in interest rates. There is a risk that interest rates across the financial system may change, possibly significantly and/or rapidly. Changes in interest rates or a lack of market participants may lead to decreased liquidity and increased volatility in the fixed-income or debt markets, making it more difficult for the Fund to sell its fixed-income or debt holdings. Decreased liquidity in the fixed-income or debt markets also may make it more difficult to value some or all of the Fund’s fixed-income or debt holdings. For most fixed-income investments, when market interest rates fall, prices of fixed-rate debt securities rise. However, when market interest rates fall, prices of certain variable and fixed-rate debt securities may be adversely affected (i.e., falling interest rates bring the possibility of prepayment risk, as an instrument may be redeemed before maturity). Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, may result in heightened market volatility and may detract from Fund performance to the extent the Fund is exposed to such interest rates and/or volatility. Other factors that may affect the value of debt securities include, but are not limited to, economic, political, public health, and other crises and responses by governments and companies to such crises. Not all U.S. government debt securities are guaranteed by the U.S. government—some are backed only by the issuing agency, which must rely on its own resources to repay the debt. The Fund's yield will fluctuate with changes in short-term interest rates.High-Yield Securities Risk: Investments in high-yield securities or non-investment grade securities (commonly referred to as "junk bonds") are considered speculative because investments in such securities present a greater risk of loss than investments in higher quality securities. Such securities may, under certain circumstances, be less liquid than higher rated securities. These securities pay investors a premium (a high interest rate or yield) because of the potential illiquidity and increased risk of loss. These securities can also be subject to greater price volatility. In times of unusual or adverse market, economic or political conditions, these securities may experience higher than normal default rates.Liquidity and Valuation Risk: The Fund’s investments may be illiquid at the time of purchase or liquid at the time of purchase and subsequently become illiquid due to, among other things, events relating to the issuer of the securities, market events, operational issues, economic conditions, investor perceptions or lack of market participants. The lack of an active trading market may make it difficult to sell or obtain an accurate price for a security. If market conditions or issuer specific developments make it difficult to value securities, the Fund may value these securities using more subjective methods, such as fair value pricing. In such cases, the value determined for a security could be different than the value realized upon such security's sale. As a result, an investor could pay more than the market value when buying shares or receive less than the market value when selling shares. This could affect the proceeds of any redemption or the number of shares an investor receives upon purchase. The Fund is subject to the risk that it could not meet redemption requests within the allowable time period without significant dilution of remaining investors' interests in the Fund. To meet redemption requests or to raise cash to pursue other investment opportunities, the Fund may be forced to sell securities at an unfavorable time and/or under unfavorable conditions, which may adversely affect the Fund’s performance. These risks are heightened for fixed-income instruments because of the current low interest rate environment.Loan Participation Interest Risk: There may not be a readily available market for loan participation interests, which in some cases could result in the Fund disposing of such interests at a substantial discount from face value or holding such interests until maturity. In addition, the Fund may be exposed to the credit risk of the underlying corporate borrower as well as the lending institution or other participant from whom the Fund purchased the loan participation interests. The Fund may not always have direct recourse against a borrower if the borrower fails to pay scheduled principal and/or interest and may be subject to greater delays, expenses and risks than if the Fund had purchased a direct obligation of the borrower. Substantial increases in interest rates may cause an increase in loan obligation defaults.Floating Rate Loans Risk: The floating rate loans in which the Fund invests are usually rated below investment grade, or if unrated, determined by a Subadvisor to be of comparable quality (commonly referred to as "junk bonds") and are generally considered speculative because they present a greater risk of loss, including default, than higher quality debt instruments. Moreover, such investments may, under certain circumstances, be particularly susceptible to liquidity and valuation risks. Although certain floating rate loans are collateralized, there is no guarantee that the value of the collateral will be sufficient or available to satisfy the borrower’s obligation. In times of unusual or adverse market, economic or political conditions, floating rate loans may experience higher than normal default rates. In the event of a recession or serious credit event, among other eventualities, the value of the Fund's investments in floating rate loans are more likely to decline. The secondary market for floating rate loans is limited and, thus, the Fund’s ability to sell or realize the full value of its investment in these loans to reinvest sale proceeds or to meet redemption obligations may be impaired. In addition, floating rate loans generally are subject to extended settlement periods that may be longer than seven days. As a result, the Fund may be adversely affected by selling other investments at an unfavorable time and/or under unfavorable conditions or engaging in borrowing transactions, such as borrowing against its credit facility, to raise cash to meet redemption obligations or pursue other investment opportunities.In certain circumstances, floating rate loans may not be deemed to be securities. As a result, the Fund may not have the protection of the anti-fraud provisions of the federal securities laws. In such cases, the Fund generally must rely on the contractual provisions in the loan agreement and common-law fraud protections under applicable state law. Floating rate loans and other similar debt obligations that lack financial maintenance covenants or possess fewer or contingent financial maintenance covenants and other financial protections for lenders and investors (sometimes referred to as “covenant-lite” loans or obligations) are generally subject to more risk than investments that contain traditional financial maintenance covenants and financial reporting requirements.The terms of many floating rate loans and other instruments are tied to the London Interbank Offered Rate (“LIBOR”) or the Secured Overnight Financing Rate ("SOFR"), which function as reference rates or benchmarks. Certain LIBOR tenors were discontinued at the end of 2021, but the most widely used LIBOR tenors may continue to be provided on a representative basis until mid-2023. There remains uncertainty regarding the future use of LIBOR and the nature of any replacement rate, such as SOFR. As such, the potential effect of a transition away from LIBOR tenors may cause increased volatility and illiquidity in the markets for instruments with terms tied to LIBOR or other adverse consequences for these instruments. This may adversely affect the Fund and its investments in such instruments.Convertible Securities Risk: Convertible securities are typically subordinate to an issuer’s other debt obligations. In part, the total return for a convertible security depends upon the performance of the underlying stock into which it can be converted. Also, issuers of convertible securities are often not as strong financially as those issuing securities with higher credit ratings, are more likely to encounter financial difficulties and typically are more vulnerable to changes in the economy, such as a recession or a sustained period of rising interest rates, which could affect their ability to make interest and principal payments. If an issuer stops making interest and/or principal payments, the Fund could lose its entire investment.Foreign Securities Risk: Investments in foreign (non-U.S.) securities may be riskier than investments in U.S. securities. Foreign regulatory regimes and securities markets can have less stringent investor protections and disclosure standards and less liquid trading markets than U.S. regulatory regimes and securities markets, and can experience political, social and economic developments that may affect the value of the Fund's investments in foreign securities. Foreign securities may also subject the Fund's investments to changes in currency rates. Changes in the value of foreign currencies may make the return on an investment increase or decrease, unrelated to the quality or performance of the investment itself. These risks may be greater with respect to securities of companies that conduct their business activities in emerging markets or whose securities are traded principally in emerging markets.Derivatives Risk: Derivatives are investments whose value depends on (or is derived from) the value of an underlying instrument, such as a security, asset, reference rate or index. Derivative strategies may expose the Fund to greater risk than if it had invested directly in the underlying instrument and often involve leverage, which may exaggerate a loss, potentially causing the Fund to lose more money than it originally invested and would have lost had it invested directly in the underlying instrument. For example, if the Fund is the seller of credit protection in a credit default swap, the Fund effectively adds leverage to its portfolio and is subject to the credit exposure on the full notional value of the swap. Derivatives may be difficult to sell, unwind and/or value. Derivatives may also be subject to counterparty risk, which is the risk that the counterparty (the party on the other side of the transaction) on a derivative transaction will be unable or unwilling to honor its contractual obligations to the Fund. Futures may be more volatile than direct investments in the instrument underlying the contract, and may not correlate perfectly to the underlying instrument. Futures and other derivatives also may involve a small initial investment relative to the risk assumed, which could result in losses greater than if they had not been used. Due to fluctuations in the price of the underlying instrument, the Fund may not be able to profitably exercise an option and may lose its entire investment in an option. To the extent that the Fund writes or sells an option, if the decline in the value of the underlying instrument is significantly below the exercise price in the case of a written put option or increase above the exercise price in the case of a written call option, the Fund could experience a substantial loss. Swaps may be subject to counterparty credit, correlation, valuation, liquidity and leveraging risks. Swap transactions tend to shift a Fund's investment exposure from one type of investment to another and may entail the risk that a party will default on its payment obligations to the Fund. Additionally, applicable regulators have adopted rules imposing certain margin requirements, including minimums on uncleared swaps, which may result in the Fund and its counterparties posting higher margin amounts for uncleared swaps. Certain standardized swaps are subject to mandatory central clearing and exchange trading. Central clearing, which interposes a central clearinghouse to each participant’s swap, and exchange trading are intended to reduce counterparty credit risk and increase liquidity but neither makes swap transactions risk-free. Derivatives may also increase the expenses of the Fund. Equity Securities Risk: Investments in common stocks and other equity securities are particularly subject to the risk of changing economic, stock market, industry and company conditions and the risks inherent in the portfolio manager's ability to anticipate such changes that can adversely affect the value of the Fund's holdings.Money Market/Short-Term Securities Risk: To the extent the Fund holds cash or invests in money market or short-term securities, the Fund may be less likely to achieve its investment objective. In addition, it is possible that the Fund's investments in these instruments could lose money.Private Placement and Restricted Securities Risk: The Fund may invest in privately issued securities, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Securities acquired in a private placement generally are subject to strict restrictions on resale, and there may be no market or a limited market for the resale of such securities. Therefore, the Fund may be unable to dispose of such securities when it desires to do so or at the most favorable price. This potential lack of liquidity also may make it more difficult to accurately value these securities. You can lose money by investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. Past Performance The following bar chart and table indicate some of the risks of investing in the Fund. The bar chart shows you how the Fund's calendar year performance has varied over time. Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown. The average annual total returns table shows how the Fund's average annual total returns (before and after taxes) compare to those of a broad-based securities market index. The Fund has selected the ICE BofA U.S. High Yield Constrained Index as its primary benchmark. The ICE BofA U.S. High Yield Constrained Index is a market value-weighted index of all domestic and Yankee high-yield bonds, including deferred interest bonds and payment-in-kind securities. Issuers included in the ICE BofA U.S. High Yield Constrained Index have maturities of one year or more and have a credit rating lower than BBB-/Baa3, but are not in default. No single issuer may constitute greater than 2% of the ICE BofA U.S. High Yield Constrained Index. Index returns reflect no deductions for fees, expenses or taxes, except for foreign withholding taxes where applicable.Performance data for the classes varies based on differences in their fee and expense structures. Performance data is not shown for classes with less than one calendar year of performance. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Please visit newyorklifeinvestments.com/funds for more recent performance information. The following bar chart and table indicate some of the risks of investing in the Fund. Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown. The Fund has selected the ICE BofA U.S. High Yield Constrained Index as its primary benchmark. Performance data is not shown for classes with less than one calendar year of performance. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. newyorklifeinvestments.com/funds Annual Returns, Class I Shares(by calendar year 2012-2021) <table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="89%"><tr style="font-size:1pt;"><td style="width:61.54%;"> </td><td style="width:29.49%;"> </td><td style="width:8.98%;"> </td></tr><tr><td colspan="2" style="vertical-align:bottom; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000;">Best Quarter</td><td style="vertical-align:top; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; font-size:1pt;"> </td></tr><tr><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">2020, Q2</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">9.50</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">%</td></tr><tr><td colspan="2" style="vertical-align:bottom; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.25pt; border-top-style:solid; border-top-color:#000000;">Worst Quarter</td><td style="vertical-align:top; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.25pt; border-top-style:solid; border-top-color:#000000; font-size:1pt;"> </td></tr><tr><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">2020, Q1</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">-12.56</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">%</td></tr></table> Best Quarter 2020-06-30 0.0950 Worst Quarter 2020-03-31 -0.1256 Average Annual Total Returns (for the periods ended December 31, 2021) 2004-01-02 0.0537 0.0564 0.0627 0.0338 0.0336 0.0368 0.0317 0.0331 0.0366 1995-01-03 0.0037 0.0439 0.0551 2008-02-28 0.0081 0.0431 0.0545 1986-05-01 -0.0092 0.0417 0.0515 1998-09-01 0.0307 0.0450 0.0515 2012-06-29 0.0526 0.0550 0.0584 2008-05-01 0.0501 0.0526 0.0590 2016-02-29 0.0456 0.0497 0.0704 2013-06-17 0.0535 0.0572 0.0558 2020-08-31 0.0457 0.0656 ICE BofA U.S. High Yield Constrained Index 0.0535 0.0608 0.0671 After-tax returns are calculated using the highest individual federal marginal income tax rates in effect at the time of each distribution or capital gain or upon the sale of Fund shares, and do not reflect the impact of state and local taxes. In some cases, the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns are not relevant if you hold your shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns shown are for Class I shares. After-tax returns for the other share classes may vary. After-tax returns are calculated using the highest individual federal marginal income tax rates in effect at the time of each distribution or capital gain or upon the sale of Fund shares, and do not reflect the impact of state and local taxes. In some cases, the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns are not relevant if you hold your shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns shown are for Class I shares. After-tax returns for the other share classes may vary. MainStay MacKay Strategic Bond Fund Investment Objective The Fund seeks total return by investing primarily in domestic and foreign debt securities. Fees and Expenses of the Fund The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the MainStay Funds. This amount may vary depending on the MainStay Fund in which you invest. In addition, different financial intermediary firms and financial professionals may impose different sales loads and waivers. More information about these and other discounts or waivers is available from your financial professional, in the "Information on Sales Charges" section starting on page 133 of the Prospectus and Appendix A – Intermediary-Specific Sales Charge Waivers and Discounts, and in the "Alternative Sales Arrangements" section on page 142 of the Statement of Additional Information. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the MainStay Funds. 50000 Shareholder Fees (fees paid directly from your investment) 0.0450 0.0400 0 0 0 0 0 0 0 0 0.0500 0.0100 0 0 0 0 Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) 0.0060 0.0060 0.0060 0.0060 0.0060 0.0060 0.0060 0.0060 0.0025 0.0025 0.0100 0.0100 0 0.0025 0.0050 0 0.0002 0.0002 0.0002 0.0002 0.0002 0.0002 0.0002 0.0002 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0001 0.0020 0.0033 0.0033 0.0033 0.0020 0.0030 0.0030 0.0007 0.0023 0.0036 0.0036 0.0036 0.0023 0.0033 0.0033 0.0010 0.0108 0.0121 0.0196 0.0196 0.0083 0.0118 0.0143 0.0070 0.0000 0.0000 0.0000 0.0000 -0.0010 0.0000 0.0000 0.0000 0.0108 0.0121 0.0196 0.0196 0.0073 0.0118 0.0143 0.0070 Example The Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated whether or not you redeem all of your shares at the end of those periods (except as indicated with respect to Class B and Class C shares). The Example reflects Class B and Class C shares converting into Investor Class shares in years 9-10; expenses could be lower if you are eligible to convert to Class A shares instead. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects the contractual fee waiver and/or expense reimbursement arrangement, if applicable, for the current duration of the arrangement only. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Assuming no redemption Assuming redemption at end of period 555 518 199 699 199 299 75 120 146 72 778 769 615 915 615 615 255 375 452 224 1019 1038 1057 1257 1057 1057 451 649 782 390 1708 1807 2091 2091 2091 2091 1016 1432 1713 871 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 53% of the average value of its portfolio. 0.53 Principal Investment Strategies The Fund seeks to achieve its investment objective through a flexible investment process that allocates investments across the global fixed-income markets. The Fund, under normal circumstances, invests at least 80% of its assets (net assets plus any borrowings for investment purposes) in a diversified portfolio of debt or debt-related securities such as: debt or debt-related securities issued or guaranteed by the U.S. or foreign governments, their agencies or instrumentalities; obligations of international or supranational entities; debt or debt-related securities issued by U.S. or foreign corporate entities; zero coupon bonds; municipal bonds; mortgage-related and other asset-backed securities; loan participation interests; convertible bonds; and variable or floating rate debt securities. The Fund may invest in debt securities that are rated investment grade and below investment grade by a nationally recognized statistical rating organization (“NRSRO”) (such securities rated lower than BBB- and Baa3). Securities that are rated below investment grade by NRSROs are commonly referred to as “high-yield securities” or “junk bonds.” If NRSROs assign different ratings to the same security, the Fund will use the higher rating for purposes of determining the security’s credit quality. The securities may be denominated in U.S. or foreign currencies, and may have fixed, variable, floating or inverse floating rates of interest. The Fund may invest without limitation in securities of foreign issuers, including emerging markets. Generally, an issuer of a security is considered to be U.S. or foreign based on the issuer's "country of risk," as determined by a third-party service provider such as Bloomberg. The currency exposure of non-U.S. investments may or may not be hedged. The Fund may invest up to 15% of its net assets in equity securities.The Fund intends to utilize various investment strategies in a broad array of fixed-income sectors to achieve its investment objective. The Fund will not be constrained by portfolio management relative to an index. Because the Fund does not track a fixed-income index, its performance may vary at times and demonstrate low correlation to traditional fixed-income indices. In pursuing its investment objective, the Fund’s investment strategy is subject to market risk and shares may gain or lose value. The average portfolio duration of the Fund will normally vary from 0 to 7 years. Duration is a measure used to determine the sensitivity of a security’s price to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates.The Fund may invest in derivatives, such as futures, options, forward commitments and interest rate swap agreements to try to enhance returns or reduce the risk of loss by hedging certain of its holdings or manage duration. The Fund may invest up to 25% of its total assets in swaps.The Fund may purchase or sell securities on a when-issued, delayed delivery or forward commitment basis and may engage in short sales. The Fund's short positions, either direct short positions or through credit default swaps or total return swaps, may total up to 20% of the Fund’s net assets. The Fund may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques (such as buy backs or dollar rolls).Investment Process: MacKay Shields LLC, the Fund’s Subadvisor, seeks to identify investment opportunities through an investment process focused on macroeconomic analysis and bottom-up security selection. The Subadvisor allocates the Fund's investments among the various bond market sectors based on current and projected economic and market conditions. The Fund may invest across bond market sectors, geographies and credit qualities. The Subadvisor’s investment process includes a risk analysis that gives consideration to a variety of security-specific risks, including but not limited to, environmental, social and governance (“ESG”) risks that may have a material impact on the performance of a security. In addition to proprietary research, the Subadvisor may use third-party screening tools and rating systems to identify ESG risk factors that may not have been captured through its own research. The Subadvisor’s consideration of ESG risk is weighed against other criteria and therefore does not mean that any sectors, industries or individual securities are explicitly excluded from the Fund.The Subadvisor may sell a security if it believes the security will no longer contribute to meeting the investment objective of the Fund. In considering whether to sell a security, the Subadvisor may evaluate, among other things, the condition of the domestic and foreign economies, and meaningful changes in the issuer's financial condition, including changes in the issuer's credit risk and competitiveness. The Fund seeks to achieve its investment objective through a flexible investment process that allocates investments across the global fixed-income markets. The Fund, under normal circumstances, invests at least 80% of its assets (net assets plus any borrowings for investment purposes) in a diversified portfolio of debt or debt-related securities such as: debt or debt-related securities issued or guaranteed by the U.S. or foreign governments, their agencies or instrumentalities; obligations of international or supranational entities; debt or debt-related securities issued by U.S. or foreign corporate entities; zero coupon bonds; municipal bonds; mortgage-related and other asset-backed securities; loan participation interests; convertible bonds; and variable or floating rate debt securities. The Fund may invest in debt securities that are rated investment grade and below investment grade by a nationally recognized statistical rating organization (“NRSRO”) (such securities rated lower than BBB- and Baa3). Securities that are rated below investment grade by NRSROs are commonly referred to as “high-yield securities” or “junk bonds.” If NRSROs assign different ratings to the same security, the Fund will use the higher rating for purposes of determining the security’s credit quality. The securities may be denominated in U.S. or foreign currencies, and may have fixed, variable, floating or inverse floating rates of interest. The Fund may invest without limitation in securities of foreign issuers, including emerging markets. Generally, an issuer of a security is considered to be U.S. or foreign based on the issuer's "country of risk," as determined by a third-party service provider such as Bloomberg. The currency exposure of non-U.S. investments may or may not be hedged. The Fund may invest up to 15% of its net assets in equity securities. Principal Risks You can lose money by investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. The investments selected by the Subadvisor may underperform the market in which the Fund invests or other investments. The Fund may receive large purchase or redemption orders which may have adverse effects on performance if the Fund were required to sell securities, invest cash or hold a relatively large amount of cash at times when it would not otherwise do so. The principal risks of investing in the Fund are summarized below. Market Risk: The value of the Fund’s investments may fluctuate because of changes in the markets in which the Fund invests, which could cause the Fund to underperform other funds with similar investment objectives and strategies. Such changes may be rapid and unpredictable. From time to time, markets may experience periods of stress for potentially prolonged periods that may result in: (i) increased market volatility; (ii) reduced market liquidity; and (iii) increased redemptions of Fund shares. Such conditions may add significantly to the risk of volatility in the net asset value of the Fund's shares. Portfolio Management Risk: The investment strategies, practices and risk analyses used by the Subadvisor may not produce the desired results. The Subadvisor may give consideration to certain ESG criteria when evaluating an investment opportunity. The application of ESG criteria may result in the Fund (i) having exposure to certain securities or industry sectors that are significantly different than the composition of the Fund's benchmark; and (ii) performing differently than other funds and strategies in its peer group that do not take into account ESG criteria or the Fund's benchmark. Yield Risk: There can be no guarantee that the Fund will achieve or maintain any particular level of yield.Debt Securities Risk: The risks of investing in debt or fixed-income securities include (without limitation): (i) credit risk, e.g., the issuer or guarantor of a debt security may be unable or unwilling (or be perceived as unable or unwilling) to make timely principal and/or interest payments or otherwise honor its obligations, or changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may affect the value of the Fund’s investments; (ii) maturity risk, e.g., a debt security with a longer maturity may fluctuate in value more than one with a shorter maturity; (iii) market risk, e.g., low demand for debt securities may negatively impact their price; (iv) interest rate risk, e.g., when interest rates go up, the value of a debt security generally goes down, and when interest rates go down, the value of a debt security generally goes up (long-term debt securities are generally more susceptible to interest rate risk than short-term debt securities); and (v) call or prepayment risk, e.g., during a period of falling interest rates, the issuer may redeem a security by repaying it early, which may reduce the Fund’s income if the proceeds are reinvested at lower interest rates.Interest rate risk is the risk that the value of the Fund’s investments in fixed income or debt securities will change because of changes in interest rates. There is a risk that interest rates across the financial system may change, possibly significantly and/or rapidly. Changes in interest rates or a lack of market participants may lead to decreased liquidity and increased volatility in the fixed-income or debt markets, making it more difficult for the Fund to sell its fixed-income or debt holdings. Decreased liquidity in the fixed-income or debt markets also may make it more difficult to value some or all of the Fund’s fixed-income or debt holdings. For most fixed-income investments, when market interest rates fall, prices of fixed-rate debt securities rise. However, when market interest rates fall, prices of certain variable and fixed-rate debt securities may be adversely affected (i.e., falling interest rates bring the possibility of prepayment risk, as an instrument may be redeemed before maturity). Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, may result in heightened market volatility and may detract from Fund performance to the extent the Fund is exposed to such interest rates and/or volatility. Other factors that may affect the value of debt securities include, but are not limited to, economic, political, public health, and other crises and responses by governments and companies to such crises. Not all U.S. government debt securities are guaranteed by the U.S. government—some are backed only by the issuing agency, which must rely on its own resources to repay the debt. The Fund's yield will fluctuate with changes in short-term interest rates.Zero Coupon Bond Risk: Because zero-coupon securities bear no interest and compound semi-annually at the rate fixed at the time of issuance, their value generally is more volatile than the value of other fixed-income securities. An investment in zero-coupon and delayed interest securities may cause the Fund to recognize income, and therefore the Fund may be required to make distributions to shareholders before the Fund receives any cash payments on its investment.Municipal Bond Risk: Municipal bond risks include the inability of the issuer to repay the obligation, the relative lack of information about certain issuers, and the possibility of future tax and legislative changes, which could affect the market for and value of municipal securities. Municipalities continue to experience economic and financial difficulties in the current economic environment. The ability of a municipal issuer to make payments and the value of municipal bonds can be affected by uncertainties in the municipal securities market. Such uncertainties could cause increased volatility in the municipal securities market and could negatively impact the Fund’s net asset value.Short Selling and Short Exposure Risk: To the extent the Fund obtains short exposure through the use of derivatives, the Fund would be subject to leverage risk, counterparty risk and other risks associated with the use of derivatives. If a security sold short increases in price, the Fund may have to cover its short position at a higher price than the short sale price, resulting in a loss, which could be theoretically unlimited. By contrast, a loss on a long position arises from decreases in the value of the security and is limited by the fact that a security's value cannot go below zero. The Fund may have substantial short positions and must borrow those securities to make delivery to the buyer. The Fund may not be able to borrow a security that it needs to deliver or it may not be able to close out a short position at an acceptable price and may have to sell related long positions before it had intended to do so. Thus, the Fund may not be able to successfully implement its short sale strategy due to limited availability of desired securities or for other reasons. The Fund also may be required to pay a premium and other transaction costs, which would increase the cost of the security sold short. The amount of any gain will be decreased, and the amount of any loss increased, by the amount of the premium, dividends, interest or expenses the Fund may be required to pay in connection with the short sale.Until the Fund replaces a borrowed security, it is required to maintain a segregated account of cash or liquid assets with the Fund's broker or custodian to cover the Fund's short position. Generally, securities held in a segregated account cannot be sold unless they are replaced with other liquid assets. The Fund's ability to access the pledged collateral may also be impaired in the event the broker fails to comply with the terms of the contract. In such instances the Fund may not be able to substitute or sell the pledged collateral. Additionally, the Fund must maintain sufficient liquid assets (less any additional collateral held by or pledged to the broker), marked-to-market daily, to cover the short sale obligation. This may limit the Fund's investment flexibility, as well as its ability to meet redemption requests or other current obligations. By investing the proceeds received from selling securities short, the Fund could be deemed to be employing a form of leverage, which creates special risks. The use of leverage may increase the Fund's exposure to long positions and make any change in the Fund's net asset value greater than it would be without the use of leverage. This could result in increased volatility of returns. There is no guarantee that the Fund will leverage its portfolio, or if it does, that the Fund's leveraging strategy will be successful or that it will produce a higher return on an investment.Regulatory Risk: The Fund as well as the issuers of the securities and other instruments in which the Fund invests are subject to considerable regulation and the risks associated with adverse changes in laws and regulations governing their operations. For example, regulatory authorities in the United States or other countries may prohibit or restrict the ability of the Fund to short sell certain securities, either generally or with respect to certain industries or countries, which may impact the Fund's ability to fully implement its investment strategies. Derivatives Risk: Derivatives are investments whose value depends on (or is derived from) the value of an underlying instrument, such as a security, asset, reference rate or index. Derivative strategies may expose the Fund to greater risk than if it had invested directly in the underlying instrument and often involve leverage, which may exaggerate a loss, potentially causing the Fund to lose more money than it originally invested and would have lost had it invested directly in the underlying instrument. For example, if the Fund is the seller of credit protection in a credit default swap, the Fund effectively adds leverage to its portfolio and is subject to the credit exposure on the full notional value of the swap. Derivatives may be difficult to sell, unwind and/or value. Derivatives may also be subject to counterparty risk, which is the risk that the counterparty (the party on the other side of the transaction) on a derivative transaction will be unable or unwilling to honor its contractual obligations to the Fund. Futures may be more volatile than direct investments in the instrument underlying the contract, and may not correlate perfectly to the underlying instrument. Futures and other derivatives also may involve a small initial investment relative to the risk assumed, which could result in losses greater than if they had not been used. Due to fluctuations in the price of the underlying instrument, the Fund may not be able to profitably exercise an option and may lose its entire investment in an option. To the extent that the Fund writes or sells an option, if the decline in the value of the underlying instrument is significantly below the exercise price in the case of a written put option or increase above the exercise price in the case of a written call option, the Fund could experience a substantial loss. Forward commitments entail the risk that the instrument may be worth less when it is issued or received than the price the Fund agreed to pay when it made the commitment. The use of foreign currency forwards may result in currency exchange losses due to fluctuations in currency exchange rates or an imperfect correlation between portfolio holdings denominated in a particular currency and the forward contracts entered into by the Fund. Swaps may be subject to counterparty credit, correlation, valuation, liquidity and leveraging risks. Swap transactions tend to shift a Fund's investment exposure from one type of investment to another and may entail the risk that a party will default on its payment obligations to the Fund. Additionally, applicable regulators have adopted rules imposing certain margin requirements, including minimums on uncleared swaps, which may result in the Fund and its counterparties posting higher margin amounts for uncleared swaps. Certain standardized swaps are subject to mandatory central clearing and exchange trading. Central clearing, which interposes a central clearinghouse to each participant’s swap, and exchange trading are intended to reduce counterparty credit risk and increase liquidity but neither makes swap transactions risk-free. Derivatives may also increase the expenses of the Fund. High-Yield Securities Risk: Investments in high-yield securities or non-investment grade securities (commonly referred to as "junk bonds") are considered speculative because investments in such securities present a greater risk of loss than investments in higher quality securities. Such securities may, under certain circumstances, be less liquid than higher rated securities. These securities pay investors a premium (a high interest rate or yield) because of the potential illiquidity and increased risk of loss. These securities can also be subject to greater price volatility. In times of unusual or adverse market, economic or political conditions, these securities may experience higher than normal default rates.Floating Rate Notes and Variable Rate Notes Risk: Floating and variable rate notes provide for a periodic adjustment in the interest rate paid on the securities. The rate adjustment intervals may be regular and range from daily up to annually, or may be based on an event, such as a change in the prime rate. Floating and variable rate notes may be subject to greater liquidity risk than other debt securities, meaning that there may be limitations on the Fund's ability to sell the securities at any given time. Securities with floating interest rates generally are less sensitive to interest rate changes, but may decline in value if their interest rates do not rise as much or as fast as interest rates in general. Floating rate loans and other similar debt obligations that lack financial maintenance covenants or possess fewer or contingent financial maintenance covenants and other financial protections for lenders and investors (sometimes referred to as “covenant-lite” loans or obligations) are generally subject to more risk than investments that contain traditional financial maintenance covenants and financial reporting requirements. The terms of many floating rate notes and other instruments are tied to the London Interbank Offered Rate (“LIBOR”) or the Secured Overnight Financing Rate ("SOFR"), which function as reference rates or benchmarks. Certain LIBOR tenors were discontinued at the end of 2021, but the most widely used LIBOR tenors may continue to be provided on a representative basis until mid-2023. There remains uncertainty regarding the future use of LIBOR and the nature of any replacement rate, such as SOFR. As such, the potential effect of a transition away from LIBOR tenors may cause increased volatility and illiquidity in the markets for instruments with terms tied to such LIBOR tenors or other adverse consequences, such as decreased yields and reduction in value, for these instruments. This may adversely affect the Fund and its investments in such instruments.Mortgage Dollar Roll Transaction Risk: A mortgage dollar roll is a transaction in which the Fund sells mortgage-related securities from its portfolio to a counterparty from whom it simultaneously agrees to buy a similar security on a delayed delivery basis. Mortgage dollar roll transactions are subject to certain risks, including the risk that securities returned to the Fund at the end of the roll, while substantially similar, may be inferior to what was initially sold to the counterparty.Mortgage-Related and Other Asset-Backed Securities Risk: Investments in mortgage-related securities (such as mortgage-backed securities) and other asset-backed securities generally involve a stream of payments based on the underlying obligations. These payments, which are often part interest and part return of principal, vary based on the rate at which the underlying borrowers repay their loans or other obligations. Asset-backed securities are subject to the risk that borrowers may default on the underlying obligations and that, during periods of falling interest rates, these obligations may be called or prepaid and, during periods of rising interest rates, obligations may be paid more slowly than expected. Impairment of the underlying obligations or collateral, such as by non-payment, will reduce the security's value. Enforcing rights against such collateral in events of default may be difficult or insufficient. The value of these securities may be significantly affected by changes in interest rates, the market's perception of issuers, and the creditworthiness of the parties involved. The ability of the Fund to successfully utilize these instruments may depend on the ability of the Subadvisor to forecast interest rates and other economic factors correctly. These securities may have a structure that makes their reaction to interest rate changes and other factors difficult to predict, making their value highly volatile.Loan Participation Interest Risk: There may not be a readily available market for loan participation interests, which in some cases could result in the Fund disposing of such interests at a substantial discount from face value or holding such interests until maturity. In addition, the Fund may be exposed to the credit risk of the underlying corporate borrower as well as the lending institution or other participant from whom the Fund purchased the loan participation interests. The Fund may not always have direct recourse against a borrower if the borrower fails to pay scheduled principal and/or interest and may be subject to greater delays, expenses and risks than if the Fund had purchased a direct obligation of the borrower. Substantial increases in interest rates may cause an increase in loan obligation defaults.Floating Rate Loans Risk: The floating rate loans in which the Fund invests are usually rated below investment grade, or if unrated, determined by a Subadvisor to be of comparable quality (commonly referred to as "junk bonds") and are generally considered speculative because they present a greater risk of loss, including default, than higher quality debt instruments. Moreover, such investments may, under certain circumstances, be particularly susceptible to liquidity and valuation risks. Although certain floating rate loans are collateralized, there is no guarantee that the value of the collateral will be sufficient or available to satisfy the borrower’s obligation. In times of unusual or adverse market, economic or political conditions, floating rate loans may experience higher than normal default rates. In the event of a recession or serious credit event, among other eventualities, the value of the Fund's investments in floating rate loans are more likely to decline. The secondary market for floating rate loans is limited and, thus, the Fund’s ability to sell or realize the full value of its investment in these loans to reinvest sale proceeds or to meet redemption obligations may be impaired. In addition, floating rate loans generally are subject to extended settlement periods that may be longer than seven days. As a result, the Fund may be adversely affected by selling other investments at an unfavorable time and/or under unfavorable conditions or engaging in borrowing transactions, such as borrowing against its credit facility, to raise cash to meet redemption obligations or pursue other investment opportunities.In certain circumstances, floating rate loans may not be deemed to be securities. As a result, the Fund may not have the protection of the anti-fraud provisions of the federal securities laws. In such cases, the Fund generally must rely on the contractual provisions in the loan agreement and common-law fraud protections under applicable state law. Floating rate loans and other similar debt obligations that lack financial maintenance covenants or possess fewer or contingent financial maintenance covenants and other financial protections for lenders and investors (sometimes referred to as “covenant-lite” loans or obligations) are generally subject to more risk than investments that contain traditional financial maintenance covenants and financial reporting requirements.The terms of many floating rate loans and other instruments are tied to the London Interbank Offered Rate (“LIBOR”) or the Secured Overnight Financing Rate ("SOFR"), which function as reference rates or benchmarks. Certain LIBOR tenors were discontinued at the end of 2021, but the most widely used LIBOR tenors may continue to be provided on a representative basis until mid-2023. There remains uncertainty regarding the future use of LIBOR and the nature of any replacement rate, such as SOFR. As such, the potential effect of a transition away from LIBOR tenors may cause increased volatility and illiquidity in the markets for instruments with terms tied to LIBOR or other adverse consequences for these instruments. This may adversely affect the Fund and its investments in such instruments.Foreign Securities Risk: Investments in foreign (non-U.S.) securities may be riskier than investments in U.S. securities. Foreign regulatory regimes and securities markets can have less stringent investor protections and disclosure standards and less liquid trading markets than U.S. regulatory regimes and securities markets, and can experience political, social and economic developments that may affect the value of the Fund's investments in foreign securities. Foreign securities may also subject the Fund's investments to changes in currency rates. Changes in the value of foreign currencies may make the return on an investment increase or decrease, unrelated to the quality or performance of the investment itself. Emerging Markets Risk: The risks related to investing in foreign securities are generally greater with respect to securities of companies that conduct their business activities in emerging markets or whose securities are traded principally in emerging markets. The risks of investing in emerging markets are elevated under current conditions and include: (i) smaller trading volumes for such securities and limited access to investments in the event of market closures (including due to local holidays), which result in a lack of liquidity and in greater price volatility; (ii) less government regulation, which could lead to market manipulation, and less extensive, transparent and frequent accounting, auditing, recordkeeping, financial reporting and other requirements, which limit the quality and availability of financial information; (iii) the absence of developed legal systems, including structures governing private or foreign investment or allowing for judicial redress (such as limits on rights and remedies available to the Fund) for investment losses and injury to private property; (iv) loss resulting from problems in share registration and custody; (v) sensitivity to adverse political or social events affecting the region where an emerging market is located; (vi) particular sensitivity to economic and political disruptions, including adverse effects stemming from recessions, depressions or other economic crises, or reliance on international or other forms of aid, including trade, taxation and development policies; and (vii) the nationalization of foreign deposits or assets.Convertible Securities Risk: Convertible securities are typically subordinate to an issuer’s other debt obligations. In part, the total return for a convertible security depends upon the performance of the underlying stock into which it can be converted. Also, issuers of convertible securities are often not as strong financially as those issuing securities with higher credit ratings, are more likely to encounter financial difficulties and typically are more vulnerable to changes in the economy, such as a recession or a sustained period of rising interest rates, which could affect their ability to make interest and principal payments. If an issuer stops making interest and/or principal payments, the Fund could lose its entire investment.Equity Securities Risk: Investments in common stocks and other equity securities are particularly subject to the risk of changing economic, stock market, industry and company conditions and the risks inherent in the portfolio managers' ability to anticipate such changes that can adversely affect the value of the Fund's holdings.When-Issued Securities Risk: The Fund may agree to purchase a security on a when-issued basis, making a commitment to pay a fixed price for a security when it is issued in the future. The principal risk of transactions involving when-issued securities is that the security will be worth less when it is issued or received than the price the Fund agreed to pay when it made the commitment.Liquidity and Valuation Risk: The Fund’s investments may be illiquid at the time of purchase or liquid at the time of purchase and subsequently become illiquid due to, among other things, events relating to the issuer of the securities, market events, operational issues, economic conditions, investor perceptions or lack of market participants. The lack of an active trading market may make it difficult to sell or obtain an accurate price for a security. If market conditions or issuer specific developments make it difficult to value securities, the Fund may value these securities using more subjective methods, such as fair value pricing. In such cases, the value determined for a security could be different than the value realized upon such security's sale. As a result, an investor could pay more than the market value when buying shares or receive less than the market value when selling shares. This could affect the proceeds of any redemption or the number of shares an investor receives upon purchase. The Fund is subject to the risk that it could not meet redemption requests within the allowable time period without significant dilution of remaining investors' interests in the Fund. To meet redemption requests or to raise cash to pursue other investment opportunities, the Fund may be forced to sell securities at an unfavorable time and/or under unfavorable conditions, which may adversely affect the Fund’s performance. These risks are heightened for fixed-income instruments because of the current low interest rate environment.Money Market/Short-Term Securities Risk: To the extent the Fund holds cash or invests in money market or short-term securities, the Fund may be less likely to achieve its investment objective. In addition, it is possible that the Fund's investments in these instruments could lose money.Private Placement and Restricted Securities Risk: The Fund may invest in privately issued securities, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Securities acquired in a private placement generally are subject to strict restrictions on resale, and there may be no market or a limited market for the resale of such securities. Therefore, the Fund may be unable to dispose of such securities when it desires to do so or at the most favorable price. This potential lack of liquidity also may make it more difficult to accurately value these securities. You can lose money by investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. Past Performance The following bar chart and table indicate some of the risks of investing in the Fund. The bar chart shows you how the Fund's calendar year performance has varied over time. Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown. The average annual total returns table shows how the Fund's average annual total returns (before and after taxes) compare to those of a broad-based securities market index as well as two additional benchmarks. The Fund has selected the Bloomberg U.S. Aggregate Bond Index as its primary benchmark. The Bloomberg U.S. Aggregate Bond Index is a broad-based benchmark that measures the investment grade, U.S. dollar-denominated, fixed-rate taxable bond market, including Treasuries, government-related and corporate securities, mortgage-backed securities (agency fixed-rate and hybrid adjustable rate mortgage pass-throughs), asset-backed securities, and commercial mortgage-backed securities. The Fund has selected the ICE BofA U.S. Dollar 3-Month Deposit Offered Rate Constant Maturity Index as its secondary benchmark. The ICE BofA U.S. Dollar 3-Month Deposit Offered Rate Constant Maturity Index is unmanaged and tracks the performance of a synthetic asset paying a deposit offered rate to a stated maturity. The ICE BofA U.S. Dollar 3-Month Deposit Offered Rate Constant Maturity Index is based on the assumed purchase at par of a synthetic instrument having exactly its stated maturity and with a coupon equal to that day’s fixing rate. That issue is assumed to be sold the following business day (priced at a yield equal to the current day fixing rate) and rolled into a new instrument. The Fund has selected the Morningstar Nontraditional Bond Category Average as an additional benchmark. The Morningstar Nontraditional Bond Category Average contains funds that pursue strategies divergent in one or more ways from conventional practice in the broader bond-fund universe. Morningstar category averages are equal-weighted returns based on constituents of the category at the end of the period. Index returns reflect no deductions for fees, expenses or taxes, except for foreign withholding taxes where applicable.Performance data for the classes varies based on differences in their fee and expense structures. Performance data is not shown for classes with less than one calendar year of performance. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Please visit newyorklifeinvestments.com/funds for more recent performance information.Effective February 28, 2013, the Fund's investment objective and principal investment strategies changed. The performance in the bar chart and table prior to that date reflects the Fund's prior investment objective and principal investment strategies. The following bar chart and table indicate some of the risks of investing in the Fund. Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown. The Fund has selected the Bloomberg U.S. Aggregate Bond Index as its primary benchmark. Performance data is not shown for classes with less than one calendar year of performance. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. newyorklifeinvestments.com/funds Annual Returns, Class I Shares(by calendar year 2012-2021) <table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="89%"><tr style="font-size:1pt;"><td style="width:61.54%;"> </td><td style="width:29.49%;"> </td><td style="width:8.98%;"> </td></tr><tr><td colspan="2" style="vertical-align:bottom; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000;">Best Quarter</td><td style="vertical-align:top; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; font-size:1pt;"> </td></tr><tr><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">2020, Q2</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">7.20</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">%</td></tr><tr><td colspan="2" style="vertical-align:bottom; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.25pt; border-top-style:solid; border-top-color:#000000;">Worst Quarter</td><td style="vertical-align:top; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.25pt; border-top-style:solid; border-top-color:#000000; font-size:1pt;"> </td></tr><tr><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">2020, Q1</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">-7.38</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">%</td></tr></table> Best Quarter 2020-06-30 0.0720 Worst Quarter 2020-03-31 -0.0738 Average Annual Total Returns (for the periods ended December 31, 2021) 2004-01-02 0.0220 0.0372 0.0420 0.0131 0.0252 0.0268 0.0130 0.0232 0.0257 1997-02-28 -0.0268 0.0251 0.0347 2008-02-28 -0.0232 0.0244 0.0339 1997-02-28 -0.0399 0.0225 0.0309 1998-09-01 0.0000 0.0264 0.0311 2014-02-28 0.0192 0.0338 0.0255 2016-02-29 0.0152 0.0307 0.0433 2018-02-28 0.0228 0.0387 Bloomberg U.S. Aggregate Bond Index -0.0154 0.0357 0.0290 ICE BofA U.S. Dollar 3-Month Deposit Offered Rate Constant Maturity Index 0.0017 0.0140 0.0089 Morningstar Nontraditional Bond Category Average 0.0153 0.0290 0.0257 After-tax returns are calculated using the highest individual federal marginal income tax rates in effect at the time of each distribution or capital gain or upon the sale of Fund shares, and do not reflect the impact of state and local taxes. In some cases, the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns are not relevant if you hold your shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns shown are for Class I shares. After-tax returns for the other share classes may vary. After-tax returns are calculated using the highest individual federal marginal income tax rates in effect at the time of each distribution or capital gain or upon the sale of Fund shares, and do not reflect the impact of state and local taxes. In some cases, the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns are not relevant if you hold your shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns shown are for Class I shares. After-tax returns for the other share classes may vary. MainStay MacKay U.S. Infrastructure Bond Fund Investment Objective The Fund seeks current income. Fees and Expenses of the Fund The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the MainStay Funds. This amount may vary depending on the MainStay Fund in which you invest. In addition, different financial intermediary firms and financial professionals may impose different sales loads and waivers. More information about these and other discounts or waivers is available from your financial professional, in the "Information on Sales Charges" section starting on page 133 of the Prospectus and Appendix A – Intermediary-Specific Sales Charge Waivers and Discounts, and in the "Alternative Sales Arrangements" section on page 142 of the Statement of Additional Information. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the MainStay Funds. 50000 Shareholder Fees (fees paid directly from your investment) 0.0450 0.0400 0 0 0 0 0 0 0.0500 0.0100 0 0 Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) 0.0050 0.0050 0.0050 0.0050 0.0050 0.0050 0.0025 0.0025 0.0100 0.0100 0 0 0.0021 0.0058 0.0058 0.0058 0.0021 0.0006 0.0096 0.0133 0.0208 0.0208 0.0071 0.0056 -0.0011 -0.0016 -0.0016 -0.0016 -0.0011 -0.0003 0.0085 0.0117 0.0192 0.0192 0.0060 0.0053 Example The Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated whether or not you redeem all of your shares at the end of those periods (except as indicated with respect to Class B and Class C shares). The Example reflects Class B and Class C shares converting into Investor Class shares in years 9-10; expenses could be lower if you are eligible to convert to Class A shares instead. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects the contractual fee waiver and/or expense reimbursement arrangement, if applicable, for the current duration of the arrangement only. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Assuming no redemption Assuming redemption at end of period 533 514 195 695 195 295 61 54 732 789 636 936 636 636 216 176 947 1085 1104 1304 1104 1104 384 310 1565 1924 2206 2206 2206 2206 872 699 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 51% of the average value of its portfolio. 0.51 Principal Investment Strategies The Fund, under normal circumstances, invests at least 80% of its assets (net assets plus any borrowings for investment purposes) in an actively managed, diversified portfolio of U.S. infrastructure-related debt issuers and/or securities intended primarily to finance infrastructure-related activities. Infrastructure-related debt securities may include securities with special features (e.g., puts and variable or floating rates) that have price volatility characteristics similar to other debt securities. Infrastructure-related investments include securities issued to finance any assets or projects that support the operation, function, growth or development of a community or economy. Examples of these investments include, but are not limited to, transportation assets (e.g., roads and bridges), utility assets (e.g., electric, gas and water distribution facilities and networks) and social assets (e.g., hospitals and schools). The Fund may also invest in securities of issuers that (i) directly invest in infrastructure-related companies; (ii) operate or utilize infrastructure-related assets (e.g., airlines, automakers and technology companies); or (iii) have indirect exposure to infrastructure-related assets (e.g., suppliers of construction materials). The Fund invests at least 60% of its assets in taxable municipal debt securities. The Fund may invest up to 20% of its assets in tax-exempt municipal debt securities. On average, the Fund will invest in municipal bonds that have a maturity of 5 years or longer.Municipal debt securities include bonds issued by, or on behalf of, the District of Columbia, the states, the territories (including Puerto Rico, Guam and the U.S. Virgin Islands), commonwealths and possessions of the United States and their political subdivisions, and agencies, authorities and instrumentalities. All distributions by the Fund, including any distributions derived from tax-exempt municipal obligations, may be includible in taxable income for purposes of the federal alternative minimum tax. The Fund does not seek to provide income exempt from federal income tax. The Fund may invest in both taxable and tax-exempt municipal bonds.The Fund invests in investment grade securities as rated by a nationally recognized statistical rating organization (“NRSRO”) at the time of purchase, or if unrated, determined to be of comparable quality by MacKay Shields LLC, the Fund’s Subadvisor, and invests in commercial paper only if rated in the top two highest rating categories by an NRSRO at the time of purchase, or if unrated, determined by the Subadvisor to be of comparable quality. If NRSROs assign different ratings for the same security, the Fund will use the higher rating for purposes of determining the credit quality.The Fund's principal investments may have fixed, variable or floating interest rates and include: taxable and tax-exempt municipal debt securities; obligations issued or guaranteed by the U.S. government, its agencies or instrumentalities; mortgage-related and asset-backed securities; certificates of deposit, time deposits and bankers' acceptances issued by U.S. banks or savings and loan associations; and debt securities issued by United States.The Fund may invest in derivatives, such as futures, options and swap agreements, to seek enhanced returns or to seek to reduce the risk of loss by hedging certain of its holdings.Investment Process: The Subadvisor seeks to allocate investments primarily across the taxable fixed income market but can also utilize the tax-exempt fixed income market as well as treasuries and agencies. Allocations are based on the current economic environment, the level of absolute and relative yields, and the interest rate outlook. The Subadvisor’s investment process includes a risk analysis that gives consideration to a variety of security-specific risks, including but not limited to, environmental, social and governance (“ESG”) risks that may have a material impact on the performance of a security. In addition to proprietary research, the Subadvisor may use screening tools and, to the extent available, third party data to identify ESG risk factors that may not have been captured through its own research. The Subadvisor’s consideration of ESG risk is weighed against other criteria and therefore does not mean that any sectors, industries or individual securities are explicitly excluded from the Fund.The Subadvisor may sell a security if it no longer believes that the security will contribute to meeting the investment objective of the Fund, which may be determined by an evaluation of economic conditions, the issuer's financial condition or relative yield and return expectations. The Fund, under normal circumstances, invests at least 80% of its assets (net assets plus any borrowings for investment purposes) in an actively managed, diversified portfolio of U.S. infrastructure-related debt issuers and/or securities intended primarily to finance infrastructure-related activities. Infrastructure-related debt securities may include securities with special features (e.g., puts and variable or floating rates) that have price volatility characteristics similar to other debt securities. Infrastructure-related investments include securities issued to finance any assets or projects that support the operation, function, growth or development of a community or economy. Examples of these investments include, but are not limited to, transportation assets (e.g., roads and bridges), utility assets (e.g., electric, gas and water distribution facilities and networks) and social assets (e.g., hospitals and schools). Principal Risks You can lose money by investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. The investments selected by the Subadvisor may underperform the market in which the Fund invests or other investments. The Fund may receive large purchase or redemption orders which may have adverse effects on performance if the Fund were required to sell securities, invest cash or hold a relatively large amount of cash at times when it would not otherwise do so. The principal risks of investing in the Fund are summarized below. Market Risk: The value of the Fund’s investments may fluctuate because of changes in the markets in which the Fund invests, which could cause the Fund to underperform other funds with similar investment objectives and strategies. Such changes may be rapid and unpredictable. From time to time, markets may experience periods of stress for potentially prolonged periods that may result in: (i) increased market volatility; (ii) reduced market liquidity; and (iii) increased redemptions of Fund shares. Such conditions may add significantly to the risk of volatility in the net asset value of the Fund's shares. Portfolio Management Risk: The investment strategies, practices and risk analyses used by the Subadvisor may not produce the desired results. The Subadvisor may give consideration to certain ESG criteria when evaluating an investment opportunity. The application of ESG criteria may result in the Fund (i) having exposure to certain securities or industry sectors that are significantly different than the composition of the Fund's benchmark; and (ii) performing differently than other funds and strategies in its peer group that do not take into account ESG criteria or the Fund's benchmark. Yield Risk: There can be no guarantee that the Fund will achieve or maintain any particular level of yield.Debt Securities Risk: The risks of investing in debt or fixed-income securities include (without limitation): (i) credit risk, e.g., the issuer or guarantor of a debt security may be unable or unwilling (or be perceived as unable or unwilling) to make timely principal and/or interest payments or otherwise honor its obligations, or changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may affect the value of the Fund’s investments; (ii) maturity risk, e.g., a debt security with a longer maturity may fluctuate in value more than one with a shorter maturity; (iii) market risk, e.g., low demand for debt securities may negatively impact their price; (iv) interest rate risk, e.g., when interest rates go up, the value of a debt security generally goes down, and when interest rates go down, the value of a debt security generally goes up (long-term debt securities are generally more susceptible to interest rate risk than short-term debt securities); and (v) call or prepayment risk, e.g., during a period of falling interest rates, the issuer may redeem a security by repaying it early, which may reduce the Fund’s income if the proceeds are reinvested at lower interest rates.Interest rate risk is the risk that the value of the Fund’s investments in fixed income or debt securities will change because of changes in interest rates. There is a risk that interest rates across the financial system may change, possibly significantly and/or rapidly. Changes in interest rates or a lack of market participants may lead to decreased liquidity and increased volatility in the fixed-income or debt markets, making it more difficult for the Fund to sell its fixed-income or debt holdings. Decreased liquidity in the fixed-income or debt markets also may make it more difficult to value some or all of the Fund’s fixed-income or debt holdings. For most fixed-income investments, when market interest rates fall, prices of fixed-rate debt securities rise. However, when market interest rates fall, prices of certain variable and fixed-rate debt securities may be adversely affected (i.e., falling interest rates bring the possibility of prepayment risk, as an instrument may be redeemed before maturity). Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, may result in heightened market volatility and may detract from Fund performance to the extent the Fund is exposed to such interest rates and/or volatility. Other factors that may affect the value of debt securities include, but are not limited to, economic, political, public health, and other crises and responses by governments and companies to such crises. Not all U.S. government debt securities are guaranteed by the U.S. government—some are backed only by the issuing agency, which must rely on its own resources to repay the debt. The Fund's yield will fluctuate with changes in short-term interest rates. Investments in debt or fixed-income securities with put options may receive a lower interest rate than similar investments with a fixed-rate that cannot be redeemed before maturity. In addition, if the Fund chooses to exercise its right to put the bond back to the issuer or put provider, these investments are subject to, among other risks, the risk that the put provider will be unable or unwilling to honor the put feature (i.e., purchase the security).Infrastructure Investment Risk: The Fund’s investments in infrastructure-related securities expose the Fund to potential adverse economic, regulatory, political, legal and other changes affecting such investments. Issuers of securities in infrastructure-related businesses are subject to a variety of factors that may adversely affect their business or operations, including high interest costs in connection with capital construction programs, high leverage, costs associated with environmental or other regulations and the effects of economic slowdowns. Rising interest rates could lead to higher financing costs and reduced earnings for infrastructure companies/issuers.Municipal Bond Risk: Municipal bond risks include the inability of the issuer to repay the obligation, the relative lack of information about certain issuers, and the possibility of future tax and legislative changes, which could affect the market for and value of municipal securities. Additional risks include:· General Obligation Bonds Risk—timely payments depend on the issuer's credit quality, ability to raise tax revenues and ability to maintain an adequate tax base;· Revenue Bonds (including Industrial Development Bonds) Risk—timely payments depend on the money earned by the particular facility or class of facilities, or the amount of revenues derived from another source, and may be negatively impacted by the general credit of the user of the facility;· Private Activity Bonds Risk—municipalities and other public authorities issue private activity bonds to finance development of industrial facilities for use by a private enterprise, which is solely responsible for paying the principal and interest on the bond, and payment under these bonds depends on the private enterprise’s ability to do so; · Moral Obligation Bonds Risk—moral obligation bonds are generally issued by special purpose public authorities of a state or municipality. If the issuer is unable to meet its obligations, repayment of these bonds becomes a moral commitment, but not a legal obligation, of the state or municipality; · Municipal Notes Risk—municipal notes are shorter-term municipal debt obligations that pay interest that is, in the opinion of bond counsel, generally excludable from gross income for federal income tax purposes (except that the interest may be includable in taxable income for purposes of the federal alternative minimum tax) and that have a maturity that is generally one year or less. If there is a shortfall in the anticipated proceeds, the notes may not be fully repaid and the Fund may lose money; and· Municipal Lease Obligations Risk—in a municipal lease obligation, the issuer agrees to make payments when due on the lease obligation. Although the issuer does not pledge its unlimited taxing power for payment of the lease obligation, the lease obligation is secured by the leased property. Municipal leases may pose additional risks because many leases and contracts contain “non-appropriation” clauses that provide that the governmental issuer has no obligation to make future payments under the lease or contract unless money is appropriated for this purpose by the appropriate legislative body.Municipalities continue to experience political, economic and financial difficulties in the current economic environment. The ability of a municipal issuer to make payments and the value of municipal bonds can be affected by uncertainties in the municipal securities market. Such uncertainties could cause increased volatility in the municipal securities market and could negatively impact the Fund's net asset value and/or the distributions paid by the Fund.Certain of the issuers in which the Fund may invest have recently experienced, or may experience, significant financial difficulties and repeated credit rating downgrades. For example, in recent years, Puerto Rico has experienced difficult financial, economic and other conditions, which may negatively affect the value of the Fund’s holdings in Puerto Rico municipal securities.To be tax exempt, municipal bonds must meet certain regulatory requirements. If a municipal bond fails to meet such requirements, the interest received by the Fund from its investment in such bonds and distributed to shareholders may be taxable. It is possible that interest on a municipal bond may be declared taxable after the issuance of the bond, and this determination may apply retroactively to the date of the issuance of the bond, which would cause a portion of prior distributions made by the Fund to be taxable to shareholders in the year of receipt.Municipal Bond Focus Risk: From time to time the Fund may invest a substantial amount of its assets in municipal bonds on which interest is paid solely from revenues of similar projects. If the Fund focuses its investments in this manner, it assumes the legal and economic risks relating to such projects, which may have a significant impact on the Fund’s investment performance. In addition, the Fund may invest more heavily in bonds from certain cities, states or regions than others, which may increase the Fund’s exposure to losses resulting from economic, political or regulatory occurrences impacting these particular cities, states or regions.When-Issued Securities Risk: The Fund may agree to purchase a security on a when-issued basis, making a commitment to pay a fixed price for a security when it is issued in the future. The principal risk of transactions involving when-issued securities is that the security will be worth less when it is issued or received than the price the Fund agreed to pay when it made the commitment.Floating Rate Notes and Variable Rate Notes Risk: Floating and variable rate notes provide for a periodic adjustment in the interest rate paid on the securities. The rate adjustment intervals may be regular and range from daily up to annually, or may be based on an event, such as a change in the prime rate. Floating and variable rate notes may be subject to greater liquidity risk than other debt securities, meaning that there may be limitations on the Fund's ability to sell the securities at any given time. Securities with floating interest rates generally are less sensitive to interest rate changes, but may decline in value if their interest rates do not rise as much or as fast as interest rates in general. Floating rate loans and other similar debt obligations that lack financial maintenance covenants or possess fewer or contingent financial maintenance covenants and other financial protections for lenders and investors (sometimes referred to as “covenant-lite” loans or obligations) are generally subject to more risk than investments that contain traditional financial maintenance covenants and financial reporting requirements. The terms of many floating rate notes and other instruments are tied to the London Interbank Offered Rate (“LIBOR”) or the Secured Overnight Financing Rate ("SOFR"), which function as reference rates or benchmarks. Certain LIBOR tenors were discontinued at the end of 2021, but the most widely used LIBOR tenors may continue to be provided on a representative basis until mid-2023. There remains uncertainty regarding the future use of LIBOR and the nature of any replacement rate, such as SOFR. As such, the potential effect of a transition away from LIBOR tenors may cause increased volatility and illiquidity in the markets for instruments with terms tied to such LIBOR tenors or other adverse consequences, such as decreased yields and reduction in value, for these instruments. This may adversely affect the Fund and its investments in such instruments.Mortgage-Related and Other Asset-Backed Securities Risk: Investments in mortgage-related securities (such as mortgage-backed securities) and other asset-backed securities generally involve a stream of payments based on the underlying obligations. These payments, which are often part interest and part return of principal, vary based on the rate at which the underlying borrowers repay their loans or other obligations. Asset-backed securities are subject to the risk that borrowers may default on the underlying obligations and that, during periods of falling interest rates, these obligations may be called or prepaid and, during periods of rising interest rates, obligations may be paid more slowly than expected. Impairment of the underlying obligations or collateral, such as by non-payment, will reduce the security's value. Enforcing rights against such collateral in events of default may be difficult or insufficient. The value of these securities may be significantly affected by changes in interest rates, the market's perception of issuers, and the creditworthiness of the parties involved. The ability of the Fund to successfully utilize these instruments may depend on the ability of the Subadvisor to forecast interest rates and other economic factors correctly. These securities may have a structure that makes their reaction to interest rate changes and other factors difficult to predict, making their value highly volatile.Derivatives Risk: Derivatives are investments whose value depends on (or is derived from) the value of an underlying instrument, such as a security, asset, reference rate or index. Derivative strategies may expose the Fund to greater risk than if it had invested directly in the underlying instrument and often involve leverage, which may exaggerate a loss, potentially causing the Fund to lose more money than it originally invested and would have lost had it invested directly in the underlying instrument. For example, if the Fund is the seller of credit protection in a credit default swap, the Fund effectively adds leverage to its portfolio and is subject to the credit exposure on the full notional value of the swap. Derivatives may be difficult to sell, unwind and/or value. Derivatives may also be subject to counterparty risk, which is the risk that the counterparty (the party on the other side of the transaction) on a derivative transaction will be unable or unwilling to honor its contractual obligations to the Fund. Futures may be more volatile than direct investments in the instrument underlying the contract, and may not correlate perfectly to the underlying instrument. Futures and other derivatives also may involve a small initial investment relative to the risk assumed, which could result in losses greater than if they had not been used. Due to fluctuations in the price of the underlying instrument, the Fund may not be able to profitably exercise an option and may lose its entire investment in an option. To the extent that the Fund writes or sells an option, if the decline in the value of the underlying instrument is significantly below the exercise price in the case of a written put option or increase above the exercise price in the case of a written call option, the Fund could experience a substantial loss. Swaps may be subject to counterparty credit, correlation, valuation, liquidity and leveraging risks. Swap transactions tend to shift a Fund's investment exposure from one type of investment to another and may entail the risk that a party will default on its payment obligations to the Fund. Additionally, applicable regulators have adopted rules imposing certain margin requirements, including minimums on uncleared swaps, which may result in the Fund and its counterparties posting higher margin amounts for uncleared swaps. Certain standardized swaps are subject to mandatory central clearing and exchange trading. Central clearing, which interposes a central clearinghouse to each participant’s swap, and exchange trading are intended to reduce counterparty credit risk and increase liquidity but neither makes swap transactions risk-free. Derivatives may also increase the expenses of the Fund. Money Market/Short-Term Securities Risk: To the extent the Fund holds cash or invests in money market or short-term securities, the Fund may be less likely to achieve its investment objective. In addition, it is possible that the Fund's investments in these instruments could lose money.Liquidity and Valuation Risk: The Fund’s investments may be illiquid at the time of purchase or liquid at the time of purchase and subsequently become illiquid due to, among other things, events relating to the issuer of the securities, market events, operational issues, economic conditions, investor perceptions or lack of market participants. The lack of an active trading market may make it difficult to sell or obtain an accurate price for a security. If market conditions or issuer specific developments make it difficult to value securities, the Fund may value these securities using more subjective methods, such as fair value pricing. In such cases, the value determined for a security could be different than the value realized upon such security's sale. As a result, an investor could pay more than the market value when buying shares or receive less than the market value when selling shares. This could affect the proceeds of any redemption or the number of shares an investor receives upon purchase. The Fund is subject to the risk that it could not meet redemption requests within the allowable time period without significant dilution of remaining investors' interests in the Fund. To meet redemption requests or to raise cash to pursue other investment opportunities, the Fund may be forced to sell securities at an unfavorable time and/or under unfavorable conditions, which may adversely affect the Fund’s performance. These risks are heightened for fixed-income instruments because of the current low interest rate environment.Private Placement and Restricted Securities Risk: The Fund may invest in privately issued securities, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Securities acquired in a private placement generally are subject to strict restrictions on resale, and there may be no market or a limited market for the resale of such securities. Therefore, the Fund may be unable to dispose of such securities when it desires to do so or at the most favorable price. This potential lack of liquidity also may make it more difficult to accurately value these securities. You can lose money by investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. Past Performance The following bar chart and table indicate some of the risks of investing in the Fund. The bar chart shows you how the Fund's calendar year performance has varied over time. Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown. The average annual total returns table shows how the Fund's average annual total returns (before and after taxes) compare to those of a broad-based securities market index. The Fund has selected the Bloomberg 5-10 Year Taxable Municipal Bond Index as its primary benchmark. The Bloomberg 5-10 Year Taxable Municipal Bond Index is the 5-10 year component of the Bloomberg Taxable Municipal Bond Index. Index returns reflect no deductions for fees, expenses or taxes, except for foreign withholding taxes where applicable.Performance data for the classes varies based on differences in their fee and expense structures. Performance data is not shown for classes with less than one calendar year of performance. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Please visit newyorklifeinvestments.com/funds for more recent performance information.Effective August 31, 2020, February 28, 2019 and June 21, 2019, the Fund modified its principal investment strategies. The past performance in the bar chart and table prior to those dates reflects the Fund's prior principal investment strategies. The following bar chart and table indicate some of the risks of investing in the Fund. Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown. The Fund has selected the Bloomberg 5-10 Year Taxable Municipal Bond Index as its primary benchmark. Performance data is not shown for classes with less than one calendar year of performance. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. newyorklifeinvestments.com/funds Annual Returns, Class I Shares(by calendar year 2012-2021) <table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="89%"><tr style="font-size:1pt;"><td style="width:61.54%;"> </td><td style="width:29.49%;"> </td><td style="width:8.98%;"> </td></tr><tr><td colspan="2" style="vertical-align:bottom; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000;">Best Quarter</td><td style="vertical-align:top; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; font-size:1pt;"> </td></tr><tr><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">2019, Q2</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">4.32</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">%</td></tr><tr><td colspan="2" style="vertical-align:bottom; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.25pt; border-top-style:solid; border-top-color:#000000;">Worst Quarter</td><td style="vertical-align:top; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.25pt; border-top-style:solid; border-top-color:#000000; font-size:1pt;"> </td></tr><tr><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">2016, Q4</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">-2.70</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">%</td></tr></table> Best Quarter 2019-06-30 0.0432 Worst Quarter 2016-12-31 -0.0270 Average Annual Total Returns (for the periods ended December 31, 2021) 2004-01-02 0.0062 0.0355 0.0247 -0.0034 0.0242 0.0137 0.0044 0.0224 0.0141 1995-01-03 -0.0402 0.0235 0.0176 2008-02-28 -0.0384 0.0204 0.0148 1986-05-01 -0.0548 0.0184 0.0119 1998-09-01 -0.0156 0.0223 0.0120 2019-11-01 0.0081 0.0309 Bloomberg 5-10 Year Taxable Municipal Bond Index -0.0074 0.0459 0.0429 After-tax returns are calculated using the highest individual federal marginal income tax rates in effect at the time of each distribution or capital gain or upon the sale of Fund shares, and do not reflect the impact of state and local taxes. In some cases, the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns are not relevant if you hold your shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns shown are for Class I shares. After-tax returns for the other share classes may vary. After-tax returns are calculated using the highest individual federal marginal income tax rates in effect at the time of each distribution or capital gain or upon the sale of Fund shares, and do not reflect the impact of state and local taxes. In some cases, the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns are not relevant if you hold your shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns shown are for Class I shares. After-tax returns for the other share classes may vary. MainStay MacKay Tax Free Bond Fund Investment Objective The Fund seeks current income exempt from regular federal income tax. Fees and Expenses of the Fund The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the MainStay Funds. This amount may vary depending on the MainStay Fund in which you invest. In addition, different financial intermediary firms and financial professionals may impose different sales loads and waivers. More information about these and other discounts or waivers is available from your financial professional, in the "Information on Sales Charges" section starting on page 133 of the Prospectus and Appendix A – Intermediary-Specific Sales Charge Waivers and Discounts, and in the "Alternative Sales Arrangements" section on page 142 of the Statement of Additional Information. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the MainStay Funds. 50000 Shareholder Fees (fees paid directly from your investment) 0.0450 0.0400 0 0 0 0 0 0 0 0.0500 0.0100 0.0100 0 0 Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) 0.0041 0.0041 0.0041 0.0041 0.0041 0.0041 0.0041 0.0025 0.0025 0.0050 0.0050 0.0065 0 0 0.0007 0.0010 0.0010 0.0010 0.0010 0.0007 0.0002 0.0073 0.0076 0.0101 0.0101 0.0116 0.0048 0.0043 Example The Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated whether or not you redeem all of your shares at the end of those periods (except as indicated with respect to Class B and Class C shares). The Example reflects Class B, Class C and Class C2 shares converting into Investor Class shares in years 9-10; expenses could be lower if you are eligible to convert to Class A shares instead. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects the contractual fee waiver and/or expense reimbursement arrangement, if applicable, for the current duration of the arrangement only. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Assuming no redemption Assuming redemption at end of period 521 475 103 603 103 203 118 218 49 44 673 633 322 622 322 322 368 368 154 138 838 805 558 758 558 558 638 638 269 241 1316 1305 1166 1166 1166 1166 1297 1297 604 542 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 39% of the average value of its portfolio. 0.39 Principal Investment Strategies The Fund, under normal circumstances, invests at least 80% of its assets (net assets plus borrowings for investment purposes) in municipal bonds that are rated investment grade by at least one nationally recognized statistical rating organization (“NRSRO”). On average, the Fund will invest in municipal bonds that have a maturity range of 10 to 30 years. Municipal bonds are issued by or on behalf of the District of Columbia, states, territories, commonwealths and possessions of the United States and their political subdivisions and agencies, authorities and instrumentalities. Municipal bonds include, among other instruments, general obligation bonds, revenue bonds, industrial revenue bonds, industrial development bonds, private activity bonds, as well as short-term, tax-exempt obligations such as municipal notes and variable rate demand obligations. The Fund may invest up to 20% of its net assets in unrated securities deemed by MacKay Shields LLC, the Fund's Subadvisor, to be of comparable quality. The Fund may not invest more than 20% of its net assets in tax-exempt securities subject to the federal alternative minimum tax. If NRSROs assign different ratings to the same security, the Fund will use the higher rating for purposes of determining the security’s credit quality. The Fund may invest more than 25% of its total assets in municipal bonds that are related in such a way that an economic, business or political development or change affecting one such security could also affect the other securities (for example, securities whose issuers are located in the same state). Some of the Fund's earnings may be subject to federal tax and most may be subject to state and local taxes. The Fund may invest in derivatives, such as futures, options and swap agreements to seek enhanced returns or to reduce the risk of loss by hedging certain of its holdings.Investment Process: The Subadvisor employs a relative value research-driven approach in pursuing the Fund's investment objective. The Subadvisor's strategies include duration management, sector allocation, yield curve positioning and buy/sell trade execution. The Subadvisor may engage in various portfolio strategies to achieve the Fund's investment objective, to seek to enhance the Fund's investment return and to seek to hedge the portfolio against adverse effects from movements in interest rates and in the securities markets. The Subadvisor uses active management in an effort to identify mispriced tax-exempt securities and build a consistent yield advantage. The Subadvisor focuses on reducing volatility through a disciplined investment process which includes fundamental, "bottom-up" credit research and risk management. In addition, the Subadvisor reviews macroeconomic events, technicals in the municipal market, tax policies and analyzes individual municipal securities and sectors. The Subadvisor’s investment process includes a risk analysis that gives consideration to a variety of security-specific risks, including but not limited to, environmental, social and governance (“ESG”) risks that may have a material impact on the performance of a security. In addition to proprietary research, the Subadvisor may use screening tools and, to the extent available, third party data to identify ESG risk factors that may not have been captured through its own research. The Subadvisor’s consideration of ESG risk is weighed against other criteria and therefore does not mean that any sectors, industries or individual securities are explicitly excluded from the Fund.The Subadvisor may sell a security if it no longer believes the security will contribute to meeting the investment objective of the Fund. In considering whether to sell a security, the Subadvisor may evaluate, among other things, the condition of the economy and meaningful changes in the issuer's financial condition. The Fund, under normal circumstances, invests at least 80% of its assets (net assets plus borrowings for investment purposes) in municipal bonds that are rated investment grade by at least one nationally recognized statistical rating organization (“NRSRO”). On average, the Fund will invest in municipal bonds that have a maturity range of 10 to 30 years. Municipal bonds are issued by or on behalf of the District of Columbia, states, territories, commonwealths and possessions of the United States and their political subdivisions and agencies, authorities and instrumentalities. Municipal bonds include, among other instruments, general obligation bonds, revenue bonds, industrial revenue bonds, industrial development bonds, private activity bonds, as well as short-term, tax-exempt obligations such as municipal notes and variable rate demand obligations. The Fund may invest up to 20% of its net assets in unrated securities deemed by MacKay Shields LLC, the Fund's Subadvisor, to be of comparable quality. The Fund may not invest more than 20% of its net assets in tax-exempt securities subject to the federal alternative minimum tax. If NRSROs assign different ratings to the same security, the Fund will use the higher rating for purposes of determining the security’s credit quality. The Fund may invest more than 25% of its total assets in municipal bonds that are related in such a way that an economic, business or political development or change affecting one such security could also affect the other securities (for example, securities whose issuers are located in the same state). Some of the Fund's earnings may be subject to federal tax and most may be subject to state and local taxes. The Fund may invest in derivatives, such as futures, options and swap agreements to seek enhanced returns or to reduce the risk of loss by hedging certain of its holdings.Investment Process: The Subadvisor employs a relative value research-driven approach in pursuing the Fund's investment objective. The Subadvisor's strategies include duration management, sector allocation, yield curve positioning and buy/sell trade execution. The Subadvisor may engage in various portfolio strategies to achieve the Fund's investment objective, to seek to enhance the Fund's investment return and to seek to hedge the portfolio against adverse effects from movements in interest rates and in the securities markets. Principal Risks You can lose money by investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. The investments selected by the Subadvisor may underperform the market in which the Fund invests or other investments. The Fund may receive large purchase or redemption orders which may have adverse effects on performance if the Fund were required to sell securities, invest cash or hold a relatively large amount of cash at times when it would not otherwise do so. The principal risks of investing in the Fund are summarized below. Market Risk: The value of the Fund’s investments may fluctuate because of changes in the markets in which the Fund invests, which could cause the Fund to underperform other funds with similar investment objectives and strategies. Such changes may be rapid and unpredictable. From time to time, markets may experience periods of stress for potentially prolonged periods that may result in: (i) increased market volatility; (ii) reduced market liquidity; and (iii) increased redemptions of Fund shares. Such conditions may add significantly to the risk of volatility in the net asset value of the Fund's shares. Portfolio Management Risk: The investment strategies, practices and risk analyses used by the Subadvisor may not produce the desired results. The Subadvisor may give consideration to certain ESG criteria when evaluating an investment opportunity. The application of ESG criteria may result in the Fund (i) having exposure to certain securities or industry sectors that are significantly different than the composition of the Fund's benchmark; and (ii) performing differently than other funds and strategies in its peer group that do not take into account ESG criteria or the Fund's benchmark. Yield Risk: There can be no guarantee that the Fund will achieve or maintain any particular level of yield.Debt Securities Risk: The risks of investing in debt or fixed-income securities include (without limitation): (i) credit risk, e.g., the issuer or guarantor of a debt security may be unable or unwilling (or be perceived as unable or unwilling) to make timely principal and/or interest payments or otherwise honor its obligations, or changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may affect the value of the Fund’s investments; (ii) maturity risk, e.g., a debt security with a longer maturity may fluctuate in value more than one with a shorter maturity; (iii) market risk, e.g., low demand for debt securities may negatively impact their price; (iv) interest rate risk, e.g., when interest rates go up, the value of a debt security generally goes down, and when interest rates go down, the value of a debt security generally goes up (long-term debt securities are generally more susceptible to interest rate risk than short-term debt securities); and (v) call or prepayment risk, e.g., during a period of falling interest rates, the issuer may redeem a security by repaying it early, which may reduce the Fund’s income if the proceeds are reinvested at lower interest rates.Interest rate risk is the risk that the value of the Fund’s investments in fixed income or debt securities will change because of changes in interest rates. There is a risk that interest rates across the financial system may change, possibly significantly and/or rapidly. Changes in interest rates or a lack of market participants may lead to decreased liquidity and increased volatility in the fixed-income or debt markets, making it more difficult for the Fund to sell its fixed-income or debt holdings. Decreased liquidity in the fixed-income or debt markets also may make it more difficult to value some or all of the Fund’s fixed-income or debt holdings. For most fixed-income investments, when market interest rates fall, prices of fixed-rate debt securities rise. However, when market interest rates fall, prices of certain variable and fixed-rate debt securities may be adversely affected (i.e., falling interest rates bring the possibility of prepayment risk, as an instrument may be redeemed before maturity). Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, may result in heightened market volatility and may detract from Fund performance to the extent the Fund is exposed to such interest rates and/or volatility. Other factors that may affect the value of debt securities include, but are not limited to, economic, political, public health, and other crises and responses by governments and companies to such crises. Not all U.S. government debt securities are guaranteed by the U.S. government—some are backed only by the issuing agency, which must rely on its own resources to repay the debt. The Fund's yield will fluctuate with changes in short-term interest rates.Tax Risk: Income from municipal bonds held by the Fund could be declared taxable because of unfavorable changes in tax law, adverse interpretations by the Internal Revenue Service or noncompliant conduct of a bond issuer.Derivatives Risk: Derivatives are investments whose value depends on (or is derived from) the value of an underlying instrument, such as a security, asset, reference rate or index. Derivative strategies may expose the Fund to greater risk than if it had invested directly in the underlying instrument and often involve leverage, which may exaggerate a loss, potentially causing the Fund to lose more money than it originally invested and would have lost had it invested directly in the underlying instrument. For example, if the Fund is the seller of credit protection in a credit default swap, the Fund effectively adds leverage to its portfolio and is subject to the credit exposure on the full notional value of the swap. Derivatives may be difficult to sell, unwind and/or value. Derivatives may also be subject to counterparty risk, which is the risk that the counterparty (the party on the other side of the transaction) on a derivative transaction will be unable or unwilling to honor its contractual obligations to the Fund. Futures may be more volatile than direct investments in the instrument underlying the contract, and may not correlate perfectly to the underlying instrument. Futures and other derivatives also may involve a small initial investment relative to the risk assumed, which could result in losses greater than if they had not been used. Due to fluctuations in the price of the underlying instrument, the Fund may not be able to profitably exercise an option and may lose its entire investment in an option. To the extent that the Fund writes or sells an option, if the decline in the value of the underlying instrument is significantly below the exercise price in the case of a written put option or increase above the exercise price in the case of a written call option, the Fund could experience a substantial loss. Swaps may be subject to counterparty credit, correlation, valuation, liquidity and leveraging risks. Swap transactions tend to shift a Fund's investment exposure from one type of investment to another and may entail the risk that a party will default on its payment obligations to the Fund. Additionally, applicable regulators have adopted rules imposing certain margin requirements, including minimums on uncleared swaps, which may result in the Fund and its counterparties posting higher margin amounts for uncleared swaps. Certain standardized swaps are subject to mandatory central clearing and exchange trading. Central clearing, which interposes a central clearinghouse to each participant’s swap, and exchange trading are intended to reduce counterparty credit risk and increase liquidity but neither makes swap transactions risk-free. Derivatives may also increase the expenses of the Fund. Municipal Bond Risk: Municipal bond risks include the inability of the issuer to repay the obligation, the relative lack of information about certain issuers, and the possibility of future tax and legislative changes, which could affect the market for and value of municipal securities. Additional risks include:· General Obligation Bonds Risk—timely payments depend on the issuer's credit quality, ability to raise tax revenues and ability to maintain an adequate tax base;· Revenue Bonds (including Industrial Development Bonds) Risk—timely payments depend on the money earned by the particular facility or class of facilities, or the amount of revenues derived from another source, and may be negatively impacted by the general credit of the user of the facility;· Private Activity Bonds Risk—municipalities and other public authorities issue private activity bonds to finance development of industrial facilities for use by a private enterprise, which is solely responsible for paying the principal and interest on the bond, and payment under these bonds depends on the private enterprise’s ability to do so; · Moral Obligation Bonds Risk—moral obligation bonds are generally issued by special purpose public authorities of a state or municipality. If the issuer is unable to meet its obligations, repayment of these bonds becomes a moral commitment, but not a legal obligation, of the state or municipality; · Municipal Notes Risk—municipal notes are shorter-term municipal debt obligations that pay interest that is, in the opinion of bond counsel, generally excludable from gross income for federal income tax purposes (except that the interest may be includable in taxable income for purposes of the federal alternative minimum tax) and that have a maturity that is generally one year or less. If there is a shortfall in the anticipated proceeds, the notes may not be fully repaid and the Fund may lose money; and· Municipal Lease Obligations Risk—in a municipal lease obligation, the issuer agrees to make payments when due on the lease obligation. Although the issuer does not pledge its unlimited taxing power for payment of the lease obligation, the lease obligation is secured by the leased property. Municipal leases may pose additional risks because many leases and contracts contain “non-appropriation” clauses that provide that the governmental issuer has no obligation to make future payments under the lease or contract unless money is appropriated for this purpose by the appropriate legislative body.Municipalities continue to experience political, economic and financial difficulties in the current economic environment. The ability of a municipal issuer to make payments and the value of municipal bonds can be affected by uncertainties in the municipal securities market. Such uncertainties could cause increased volatility in the municipal securities market and could negatively impact the Fund's net asset value and/or the distributions paid by the Fund.Certain of the issuers in which the Fund may invest have recently experienced, or may experience, significant financial difficulties and repeated credit rating downgrades. For example, in recent years, Puerto Rico has experienced difficult financial, economic and other conditions, which may negatively affect the value of the Fund’s holdings in Puerto Rico municipal securities.To be tax exempt, municipal bonds must meet certain regulatory requirements. If a municipal bond fails to meet such requirements, the interest received by the Fund from its investment in such bonds and distributed to shareholders may be taxable. It is possible that interest on a municipal bond may be declared taxable after the issuance of the bond, and this determination may apply retroactively to the date of the issuance of the bond, which would cause a portion of prior distributions made by the Fund to be taxable to shareholders in the year of receipt.Municipal Bond Focus Risk: From time to time the Fund may invest a substantial amount of its assets in municipal bonds on which interest is paid solely from revenues of similar projects. If the Fund focuses its investments in this manner, it assumes the legal and economic risks relating to such projects, which may have a significant impact on the Fund’s investment performance. In addition, the Fund may invest more heavily in bonds from certain cities, states or regions than others, which may increase the Fund’s exposure to losses resulting from economic, political or regulatory occurrences impacting these particular cities, states or regions.Liquidity and Valuation Risk: The Fund’s investments may be illiquid at the time of purchase or liquid at the time of purchase and subsequently become illiquid due to, among other things, events relating to the issuer of the securities, market events, operational issues, economic conditions, investor perceptions or lack of market participants. The lack of an active trading market may make it difficult to sell or obtain an accurate price for a security. If market conditions or issuer specific developments make it difficult to value securities, the Fund may value these securities using more subjective methods, such as fair value pricing. In such cases, the value determined for a security could be different than the value realized upon such security's sale. As a result, an investor could pay more than the market value when buying shares or receive less than the market value when selling shares. This could affect the proceeds of any redemption or the number of shares an investor receives upon purchase. The Fund is subject to the risk that it could not meet redemption requests within the allowable time period without significant dilution of remaining investors' interests in the Fund. To meet redemption requests or to raise cash to pursue other investment opportunities, the Fund may be forced to sell securities at an unfavorable time and/or under unfavorable conditions, which may adversely affect the Fund’s performance. These risks are heightened for fixed-income instruments because of the current low interest rate environment.Money Market/Short-Term Securities Risk: To the extent the Fund holds cash or invests in money market or short-term securities, the Fund may be less likely to achieve its investment objective. In addition, it is possible that the Fund's investments in these instruments could lose money.Variable Rate Demand Instruments Risk: A variable rate demand instrument is generally subject to certain of the risks associated with debt securities. Variable rate demand instruments are also subject to potential delays between the instrument’s periodic interest rate reset and an intervening rise in general interest rates, which could adversely affect the Fund. In addition, these instruments are subject to the risk that, if not held to maturity, the Fund will be subject to the credit risk of any third party supporting or providing the instrument’s demand feature, as well as the risk that such third party’s obligations may terminate or that it may otherwise fail to meet such obligations.Private Placement and Restricted Securities Risk: The Fund may invest in privately issued securities, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Securities acquired in a private placement generally are subject to strict restrictions on resale, and there may be no market or a limited market for the resale of such securities. Therefore, the Fund may be unable to dispose of such securities when it desires to do so or at the most favorable price. This potential lack of liquidity also may make it more difficult to accurately value these securities. You can lose money by investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. Past Performance The following bar chart and table indicate some of the risks of investing in the Fund. The bar chart shows you how the Fund's calendar year performance has varied over time. Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown. The average annual total returns table shows how the Fund's average annual total returns (before and after taxes) compare to those of a broad-based securities market index. The Fund has selected the Bloomberg Municipal Bond Index as its primary benchmark. The Bloomberg Municipal Bond Index is considered representative of the broad market for investment-grade, tax-exempt bonds with a maturity of at least one year. Bonds subject to the alternative minimum tax or with floating or zero coupons are excluded. Index returns reflect no deductions for fees, expenses or taxes, except for foreign withholding taxes where applicable.Performance data for the classes varies based on differences in their fee and expense structures. Performance data is not shown for classes with less than one calendar year of performance. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Please visit newyorklifeinvestments.com/funds for more recent performance information. The following bar chart and table indicate some of the risks of investing in the Fund. Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown. The Fund has selected the Bloomberg Municipal Bond Index as its primary benchmark. Performance data is not shown for classes with less than one calendar year of performance. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. newyorklifeinvestments.com/funds Annual Returns, Class I Shares(by calendar year 2012-2021) <table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="89%"><tr style="font-size:1pt;"><td style="width:61.54%;"> </td><td style="width:29.49%;"> </td><td style="width:8.98%;"> </td></tr><tr><td colspan="2" style="vertical-align:bottom; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000;">Best Quarter</td><td style="vertical-align:top; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; font-size:1pt;"> </td></tr><tr><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">2014, Q1</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">4.45</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">%</td></tr><tr><td colspan="2" style="vertical-align:bottom; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.25pt; border-top-style:solid; border-top-color:#000000;">Worst Quarter</td><td style="vertical-align:top; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.25pt; border-top-style:solid; border-top-color:#000000; font-size:1pt;"> </td></tr><tr><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">2013, Q2</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">-4.24</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">%</td></tr></table> Best Quarter 2014-03-31 0.0445 Worst Quarter 2013-06-30 -0.0424 Average Annual Total Returns (for the periods ended December 31, 2021) 2009-12-21 0.0230 0.0479 0.0481 0.0222 0.0477 0.0480 0.0238 0.0441 0.0455 1995-01-03 -0.0255 0.0357 0.0408 2008-02-28 -0.0207 0.0358 0.0406 1986-05-01 -0.0331 0.0393 0.0428 1998-09-01 0.0077 0.0427 0.0427 2020-08-31 0.0052 0.0292 2019-11-01 0.0235 0.0433 Bloomberg Municipal Bond Index 0.0152 0.0417 0.0372 After-tax returns are calculated using the highest individual federal marginal income tax rates in effect at the time of each distribution or capital gain or upon the sale of Fund shares, and do not reflect the impact of state and local taxes. In some cases, the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns are not relevant if you hold your shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns shown are for Class I shares. After-tax returns for the other share classes may vary. After-tax returns are calculated using the highest individual federal marginal income tax rates in effect at the time of each distribution or capital gain or upon the sale of Fund shares, and do not reflect the impact of state and local taxes. In some cases, the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns are not relevant if you hold your shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns shown are for Class I shares. After-tax returns for the other share classes may vary. MainStay Money Market Fund Investment Objective The Fund seeks a high level of current income while preserving capital and maintaining liquidity. Fees and Expenses of the Fund The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. Shareholder Fees (fees paid directly from your investment) 0 0 0 0 0 0 0 0 0 0 Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) 0.0040 0.0040 0.0040 0.0040 0.0040 0 0 0 0 0 0.0014 0.0056 0.0056 0.0056 0.0056 0.0054 0.0096 0.0096 0.0096 0.0096 0.0000 -0.0016 -0.0016 -0.0016 -0.0016 0.0054 0.0080 0.0080 0.0080 0.0080 Example The Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated whether or not you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects the contractual fee waiver and/or expense reimbursement arrangement, if applicable, for the current duration of the arrangement only. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Assuming no redemption Assuming redemption at end of period 55 82 82 82 82 82 82 173 290 290 90 290 190 290 302 515 515 215 515 415 515 677 1163 1163 663 1163 1063 1163 Principal Investment Strategies The Fund invests in short-term, high-quality, U.S. dollar-denominated securities that generally mature in 397 days (13 months) or less. The Fund maintains a dollar-weighted average maturity of 60 days or less and maintains a dollar-weighted average life to maturity of 120 days or less. The Fund seeks to maintain a stable $1.00 net asset value per share using the amortized cost method of valuation by operating as a “retail money market fund,” as such term is defined or interpreted pursuant to Rule 2a-7 under the Investment Company Act of 1940, as amended. As a “retail money market fund,” the Fund may be subject to the implementation of liquidity fees and gates on redemptions.The Fund may invest in obligations issued or guaranteed by the U.S. government or any of its agencies or instrumentalities; U.S. and foreign bank and bank holding company obligations, such as certificates of deposit, bankers' acceptances and Eurodollars; commercial paper; time deposits; repurchase agreements; and corporate debt securities. The Fund may invest in variable rate notes, floating rate notes, and mortgage-related and asset-backed securities. The Fund may also invest in foreign securities that are U.S. dollar-denominated securities of foreign issuers.The Fund will generally invest in obligations that mature in 397 days or less, substantially all of which will be held to maturity. However, the Fund may invest in securities with a face maturity of more than 397 days provided that the security is a variable or floating rate note that meets the applicable regulatory guidelines with respect to maturity. Additionally, securities collateralizing repurchase agreements may have maturities in excess of 397 days.Investment Process: NYL Investors LLC, the Fund's Subadvisor, seeks to achieve the highest yield while also seeking to minimize risk, maintain liquidity and preserve principal. The Subadvisor selects securities based on an analysis of the creditworthiness of the issuer. The Subadvisor works to add value by emphasizing specific securities and sectors of the money market that appear to be attractively priced based upon historical and current yield spread relationships.The Subadvisor may sell a security prior to maturity if it no longer believes that the security will contribute to meeting the investment objective of the Fund. Principal Risks You can lose money by investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. The investments selected by the Subadvisor may underperform the market or other investments.Stable Net Asset Value Risk: Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund. This could occur because of unusual market conditions or a sudden collapse in the creditworthiness of an issuer. The Fund is permitted to, among other things, reduce or withhold any income and/or gains generated from its portfolio to maintain a stable $1.00 share price.Market Risk: The value of the Fund’s investments may fluctuate because of changes in the markets in which the Fund invests, which could cause the Fund to underperform other funds with similar investment objectives and strategies. Such changes may be rapid and unpredictable. From time to time, markets may experience periods of stress for potentially prolonged periods that may result in: (i) increased market volatility; (ii) reduced market liquidity; and (iii) increased redemptions of Fund shares. Portfolio Management Risk: The investment strategies, practices and risk analyses used by the Subadvisor may not produce the desired results. Money Market Risk: Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. The Fund may impose a fee upon the sale of your shares or may temporarily suspend your ability to sell shares if the Fund’s liquidity falls below required minimums because of market conditions or other factors. The Fund’s sponsor has no legal obligation to provide financial support to the Fund, and you should not expect that the sponsor will provide financial support to the Fund at any time.Debt Securities Risk: The risks of investing in debt or fixed-income securities include (without limitation): (i) credit risk, e.g., the issuer or guarantor of a debt security may be unable or unwilling (or be perceived as unable or unwilling) to make timely principal and/or interest payments or otherwise honor its obligations, or changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may affect the value of the Fund’s investments; (ii) maturity risk, e.g., a debt security with a longer maturity may fluctuate in value more than one with a shorter maturity; (iii) market risk, e.g., low demand for debt securities may negatively impact their price; (iv) interest rate risk, e.g., when interest rates go up, the value of a debt security generally goes down, and when interest rates go down, the value of a debt security generally goes up (long-term debt securities are generally more susceptible to interest rate risk than short-term debt securities); and (v) call or prepayment risk, e.g., during a period of falling interest rates, the issuer may redeem a security by repaying it early, which may reduce the Fund’s income if the proceeds are reinvested at lower interest rates.Interest rate risk is the risk that the value of the Fund’s investments in fixed income or debt securities will change because of changes in interest rates. There is a risk that interest rates across the financial system may change, possibly significantly and/or rapidly. Changes in interest rates or a lack of market participants may lead to decreased liquidity and increased volatility in the fixed-income or debt markets, making it more difficult for the Fund to sell its fixed-income or debt holdings. Decreased liquidity in the fixed-income or debt markets also may make it more difficult to value some or all of the Fund’s fixed-income or debt holdings. For most fixed-income investments, when market interest rates fall, prices of fixed-rate debt securities rise. However, when market interest rates fall, prices of certain variable and fixed-rate debt securities may be adversely affected (i.e., falling interest rates bring the possibility of prepayment risk, as an instrument may be redeemed before maturity). Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, may result in heightened market volatility and may detract from Fund performance to the extent the Fund is exposed to such interest rates and/or volatility. Other factors that may affect the value of debt securities include, but are not limited to, economic, political, public health, and other crises and responses by governments and companies to such crises. Not all U.S. government debt securities are guaranteed by the U.S. government—some are backed only by the issuing agency, which must rely on its own resources to repay the debt. The Fund's yield will fluctuate with changes in short-term interest rates.Floating Rate Notes and Variable Rate Notes Risk: Floating and variable rate notes provide for a periodic adjustment in the interest rate paid on the securities. The rate adjustment intervals may be regular and range from daily up to annually, or may be based on an event, such as a change in the prime rate. Floating and variable rate notes may be subject to greater liquidity risk than other debt securities, meaning that there may be limitations on the Fund's ability to sell the securities at any given time. Securities with floating interest rates generally are less sensitive to interest rate changes, but may decline in value if their interest rates do not rise as much or as fast as interest rates in general. Floating rate loans and other similar debt obligations that lack financial maintenance covenants or possess fewer or contingent financial maintenance covenants and other financial protections for lenders and investors (sometimes referred to as “covenant-lite” loans or obligations) are generally subject to more risk than investments that contain traditional financial maintenance covenants and financial reporting requirements. The terms of many floating rate notes and other instruments are tied to the London Interbank Offered Rate (“LIBOR”) or the Secured Overnight Financing Rate ("SOFR"), which function as reference rates or benchmarks. Certain LIBOR tenors were discontinued at the end of 2021, but the most widely used LIBOR tenors may continue to be provided on a representative basis until mid-2023. There remains uncertainty regarding the future use of LIBOR and the nature of any replacement rate, such as SOFR. As such, the potential effect of a transition away from LIBOR tenors may cause increased volatility and illiquidity in the markets for instruments with terms tied to such LIBOR tenors or other adverse consequences, such as decreased yields and reduction in value, for these instruments. This may adversely affect the Fund and its investments in such instruments.Foreign Securities Risk: Investments in foreign (non-U.S.) securities may be riskier than investments in U.S. securities. Foreign regulatory regimes and securities markets can have less stringent investor protections and disclosure standards and less liquid trading markets than U.S. regulatory regimes and securities markets, and can experience political, social and economic developments that may affect the value of the Fund's investments in foreign securities. These risks may be greater with respect to securities of companies that conduct their business activities in emerging markets or whose securities are traded principally in emerging markets.Mortgage-Related and Other Asset-Backed Securities Risk: Investments in mortgage-related securities (such as mortgage-backed securities) and other asset-backed securities generally involve a stream of payments based on the underlying obligations. These payments, which are often part interest and part return of principal, vary based on the rate at which the underlying borrowers repay their loans or other obligations. Asset-backed securities are subject to the risk that borrowers may default on the underlying obligations and that, during periods of falling interest rates, these obligations may be called or prepaid and, during periods of rising interest rates, obligations may be paid more slowly than expected. Impairment of the underlying obligations or collateral, such as by non-payment, will reduce the security's value. Enforcing rights against such collateral in events of default may be difficult or insufficient. The value of these securities may be significantly affected by changes in interest rates, the market's perception of issuers, and the creditworthiness of the parties involved. The ability of the Fund to successfully utilize these instruments may depend on the ability of the Subadvisor to forecast interest rates and other economic factors correctly. These securities may have a structure that makes their reaction to interest rate changes and other factors difficult to predict, making their value highly volatile.Repurchase Agreement Risk: Repurchase agreements are subject to the risks that the seller will become bankrupt or insolvent before the date of repurchase or otherwise will fail to repurchase the security or other asset as agreed, which could cause losses to the Fund.Yield Risk: There can be no guarantee that the Fund will achieve or maintain any particular level of yield. You can lose money by investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. Past Performance The following bar chart and table indicate some of the risks of investing in the Fund. The bar chart shows you how the Fund's calendar year performance has varied over time. The average annual total returns table shows how the Fund's average annual total returns compare to those of a money market fund average. The Average Lipper Money Market Fund is an equally weighted performance average adjusted for capital gains distributions and income dividends of all of the money market funds in the Lipper Universe. Lipper Inc., a wholly-owned subsidiary of Reuters Group PLC, is an independent monitor of mutual fund performance. Lipper averages are not class specific. Lipper returns are unaudited.For certain periods, the Manager voluntarily has waived or reimbursed the Fund’s expenses to the extent it deemed appropriate to enhance the Fund’s yield during periods when expenses had a significant impact on yield because of low interest rates. Without these waivers or reimbursements, the Fund’s returns would have been lower. Performance is not shown for classes with less than one calendar year of performance. Past performance is not necessarily an indication of how the Fund will perform in the future. For current yield information, call toll-free: 800-624-6782. The following bar chart and table indicate some of the risks of investing in the Fund. Performance is not shown for classes with less than one calendar year of performance. Past performance is not necessarily an indication of how the Fund will perform in the future. Annual Returns, Class A Shares(by calendar year 2012-2021) <table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="89%"><tr style="font-size:1pt;"><td style="width:61.54%;"> </td><td style="width:29.49%;"> </td><td style="width:8.98%;"> </td></tr><tr><td colspan="2" style="vertical-align:bottom; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000;">Best Quarter</td><td style="vertical-align:top; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; font-size:1pt;"> </td></tr><tr><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">2019, Q1</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">0.49</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">%</td></tr><tr><td colspan="2" style="vertical-align:bottom; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.25pt; border-top-style:solid; border-top-color:#000000;">Worst Quarter</td><td style="vertical-align:top; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.25pt; border-top-style:solid; border-top-color:#000000; font-size:1pt;"> </td></tr><tr><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">2021, Q1</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">0.00</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">%</td></tr></table> Best Quarter 2019-03-31 0.0049 Worst Quarter 2021-03-31 0.0000 Average Annual Total Returns (for the periods ended December 31, 2021) 1995-01-03 0.0001 0.0077 0.0039 2008-02-28 0.0001 0.0062 0.0032 1986-05-01 0.0001 0.0062 0.0032 1998-09-01 0.0001 0.0062 0.0032 2020-08-31 0.0001 0.0001 Average Lipper Money Market Fund 0.0002 0.0087 0.0046 MainStay Income Builder Fund Investment Objective The Fund seeks current income consistent with reasonable opportunity for future growth of capital and income. Fees and Expenses of the Fund The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the MainStay Funds. This amount may vary depending on the MainStay Fund in which you invest. In addition, different financial intermediary firms and financial professionals may impose different sales loads and waivers. More information about these and other discounts or waivers is available from your financial professional, in the "Information on Sales Charges" section starting on page 133 of the Prospectus and Appendix A – Intermediary-Specific Sales Charge Waivers and Discounts, and in the "Alternative Sales Arrangements" section on page 142 of the Statement of Additional Information. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the MainStay Funds. 50000 Shareholder Fees (fees paid directly from your investment) 0.0300 0.0250 0 0 0 0 0 0 0 0 0 0.0500 0.0100 0 0 0 0 0 Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) 0.0061 0.0061 0.0061 0.0061 0.0061 0.0061 0.0061 0.0061 0.0061 0.0025 0.0025 0.0100 0.0100 0 0.0025 0.0050 0 0.0050 0.0013 0.0032 0.0032 0.0032 0.0013 0.0023 0.0023 0.0005 0.0032 0.0099 0.0118 0.0193 0.0193 0.0074 0.0109 0.0134 0.0066 0.0143 Example The Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated whether or not you redeem all of your shares at the end of those periods (except as indicated with respect to Class B and Class C shares). The Example reflects Class B and Class C shares converting into Investor Class shares in years 9-10; expenses could be lower if you are eligible to convert to Class A shares instead. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects the contractual fee waiver and/or expense reimbursement arrangement, if applicable, for the current duration of the arrangement only. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Assuming no redemption Assuming redemption at end of period 398 367 196 696 196 296 76 111 136 67 146 606 615 606 906 606 606 237 347 425 211 452 831 883 1042 1242 1042 1042 411 601 734 368 782 1477 1646 2059 2059 2059 2059 918 1329 1613 822 1713 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 57% of the average value of its portfolio. 0.57 Principal Investment Strategies The Fund normally invests a minimum of 30% of its net assets in equity securities and a minimum of 30% of its net assets in debt securities. From time to time, the Fund may temporarily invest less than 30% of its net assets in equity or debt securities as a result of market conditions, individual securities transactions or cash flow considerations. Asset Allocation Investment Process: Asset allocation decisions are made by a Committee chaired by New York Life Investment Management LLC (“New York Life Investments”), the Fund’s Manager, in collaboration with MacKay Shields LLC (“MacKay Shields”), the subadvisor for the fixed-income portion of the Fund. Asset allocation decisions are determined based on the relative values of each asset class, inclusive of the ability of each asset class to generate income. The Fund may use equity index and fixed-income futures to manage effective exposure, for example, by adding exposure to the equity markets or adjusting fixed-income duration exposure. Neither equity index futures nor fixed-income futures are counted toward the Fund's equity or fixed-income allocation guidelines.Equity Investment Process: Epoch Investment Partners, Inc. ("Epoch"), the Subadvisor for the equity portion of the Fund, invests primarily in companies that generate increasing levels of free cash flow and have managements that allocate it effectively to create shareholder value. The security selection process focuses on free-cash-flow analytics as opposed to traditional accounting-based metrics. Epoch seeks to identify companies with a consistent, straightforward ability to both generate free cash flow and to intelligently allocate it among internal reinvestment opportunities, acquisitions, dividends, share repurchases and/or debt reductions. Using both quantitative and qualitative processes, material environmental, social and governance (“ESG”) factors are identified, monitored and managed by Epoch. Prior to acquiring investments on behalf of the Fund, Epoch conducts fundamental analysis on each potential investment in order to assess the ESG risk and opportunities Epoch believes it will face with regards to both cash flows and potential valuation. Material ESG factors vary by company and industry, but include issues such as carbon emissions, waste management, diversity, human capital management and executive compensation. Of these, Epoch pays particular attention to factors relating to climate change and corporate governance. This information is taken into account by Epoch in making investment decisions. Specialist external data providers may also be used by Epoch where relevant. Material ESG factors are monitored by Epoch through review of ESG data published by the company (where relevant) or selected third-party data providers to determine whether the level of ESG risk or opportunity has changed since the Epoch's initial assessment. While Epoch considers ESG factors in the investment decision-making process of the Fund, this does not mean that ESG considerations are the sole or foremost considerations for investment decisions.Epoch seeks to find and invest in companies that meet its definition of quality-companies that are free cash flow positive or are becoming free cash flow positive and that are led by strong management. The relevant factor in Epoch’s decision on how to deploy free cash flow is the cost of capital and the prospective returns on capital.Fixed-Income Investment Process: The Fund may invest in investment grade and below investment grade debt securities of varying maturities. In pursuing the Fund's investment objective, the Fund may invest up to 30% of its net assets in debt securities that MacKay Shields believes may provide capital appreciation in addition to income and are rated below investment grade by a nationally recognized statistical rating organization (“NRSRO”) or if unrated, deemed to be of comparable creditworthiness by MacKay Shields. For purposes of this limitation, both the percentage and rating are counted at the time of purchase. If NRSROs assign different ratings to the same security, the Fund will use the higher rating for purposes of determining the security's credit quality. Securities that are rated below investment grade by NRSROs are commonly referred to as “high-yield securities” or "junk bonds." MacKay Shields’ investment process includes a risk analysis that gives consideration to a variety of security-specific risks, including but not limited to, ESG risks that may have a material impact on the performance of a security. In addition to proprietary research, MacKay Shields may use third-party screening tools and rating systems to identify ESG risk factors that may not have been captured through its own research. MacKay Shields’ consideration of ESG risk is weighed against other criteria and therefore does not mean that any sectors, industries or individual securities are explicitly excluded from the Fund.The Fund maintains a flexible approach by investing in a broad range of securities, which may be diversified by company, industry and type.Principal debt investments include U.S. government securities, domestic and foreign debt securities, mortgage-related and asset-backed securities and floating rate loans. The Fund may also enter into mortgage dollar roll and to-be-announced ("TBA") securities transactions.The Fund may also invest in convertible securities such as bonds, debentures, corporate notes and preferred stocks or other securities that are convertible into common stock or the cash value of a stock or a basket or index of equity securities.Investments Across the Fund: The Fund may invest in derivatives, such as futures, options, forward commitments and swap agreements, to try to enhance returns or reduce the risk of loss by hedging certain of its holdings. The Fund also may use fixed-income futures for purposes of managing duration and yield curve exposures. The Fund may invest up to 10% of its total assets in swaps, including credit default swaps.The Subadvisors may sell a security if they no longer believe the security will contribute to meeting the investment objective of the Fund. In considering whether to sell a debt security, MacKay Shields may evaluate, among other things, deterioration in the issuer's credit quality. Epoch may sell or reduce a position in a security if, among other things, it sees an interruption to the dividend policy, a deterioration in fundamentals or when the security is deemed less attractive relative to another security on a return/risk basis. Epoch may also sell or reduce a position in a security when it believes its investment objectives have been met or if it sees the investment thesis is failing to materialize. Principal Risks You can lose money by investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. The investments selected by the Subadvisors may underperform the market in which the Fund invests or other investments. The Fund may receive large purchase or redemption orders which may have adverse effects on performance if the Fund were required to sell securities, invest cash or hold a relatively large amount of cash at times when it would not otherwise do so. The principal risks of investing in the Fund are summarized below. Market Risk: The value of the Fund’s investments may fluctuate because of changes in the markets in which the Fund invests, which could cause the Fund to underperform other funds with similar investment objectives and strategies. Such changes may be rapid and unpredictable. From time to time, markets may experience periods of stress for potentially prolonged periods that may result in: (i) increased market volatility; (ii) reduced market liquidity; and (iii) increased redemptions of Fund shares. Such conditions may add significantly to the risk of volatility in the net asset value of the Fund's shares. Multi-Manager Risk: The Fund’s performance relies on the selection and monitoring of the Subadvisors as well as how the Fund’s assets are allocated among those Subadvisors. Performance will also depend on the Subadvisors’ skill in implementing their respective strategy or strategies. The Subadvisors’ investment strategies may not always be complementary to one another and, as a result, the Subadvisors may make decisions that conflict with one another, which may adversely affect the Fund’s performance. For example, a Subadvisor may purchase an investment for the Fund at the same time that another Subadvisor sells the investment, resulting in higher expenses without accomplishing any net investment result. Alternatively, multiple Subadvisors could purchase the same investment at the same time, causing the Fund to pay higher expenses because the Subadvisors did not aggregate their transactions. The multi-manager approach may also cause the Fund to invest a substantial percentage of its assets in certain types of securities, which could expose the Fund to greater risks associated with those types of securities and lead to large beneficial or detrimental effects on the Fund’s performance. The Manager may influence a Subadvisor in terms of its management of a portion of the Fund’s assets, including hedging practices, investment exposure and risk management.A Subadvisor may underperform the market generally and may underperform other subadvisors that the Manager could have selected. MacKay Shields may be subject to potential conflicts of interest in allocating the Portfolio’s assets. Therefore, MacKay Shields will carefully analyze its allocation decisions and take all steps it believes to be necessary to minimize these potential conflicts of interest. Portfolio Management Risk: The investment strategies, practices and risk analyses used by a Subadvisor may not produce the desired results. A Subadvisor may give consideration to certain ESG criteria when evaluating an investment opportunity. The application of ESG criteria may result in the Fund (i) having exposure to certain securities or industry sectors that are significantly different than the composition of the Fund's benchmark; and (ii) performing differently than other funds and strategies in its peer group that do not take into account ESG criteria or the Fund's benchmark. Yield Risk: There can be no guarantee that the Fund will achieve or maintain any particular level of yield.Debt Securities Risk: The risks of investing in debt or fixed-income securities include (without limitation): (i) credit risk, e.g., the issuer or guarantor of a debt security may be unable or unwilling (or be perceived as unable or unwilling) to make timely principal and/or interest payments or otherwise honor its obligations, or changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may affect the value of the Fund’s investments; (ii) maturity risk, e.g., a debt security with a longer maturity may fluctuate in value more than one with a shorter maturity; (iii) market risk, e.g., low demand for debt securities may negatively impact their price; (iv) interest rate risk, e.g., when interest rates go up, the value of a debt security generally goes down, and when interest rates go down, the value of a debt security generally goes up (long-term debt securities are generally more susceptible to interest rate risk than short-term debt securities); and (v) call or prepayment risk, e.g., during a period of falling interest rates, the issuer may redeem a security by repaying it early, which may reduce the Fund’s income if the proceeds are reinvested at lower interest rates.Interest rate risk is the risk that the value of the Fund’s investments in fixed income or debt securities will change because of changes in interest rates. There is a risk that interest rates across the financial system may change, possibly significantly and/or rapidly. Changes in interest rates or a lack of market participants may lead to decreased liquidity and increased volatility in the fixed-income or debt markets, making it more difficult for the Fund to sell its fixed-income or debt holdings. Decreased liquidity in the fixed-income or debt markets also may make it more difficult to value some or all of the Fund’s fixed-income or debt holdings. For most fixed-income investments, when market interest rates fall, prices of fixed-rate debt securities rise. However, when market interest rates fall, prices of certain variable and fixed-rate debt securities may be adversely affected (i.e., falling interest rates bring the possibility of prepayment risk, as an instrument may be redeemed before maturity). Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, may result in heightened market volatility and may detract from Fund performance to the extent the Fund is exposed to such interest rates and/or volatility. Other factors that may affect the value of debt securities include, but are not limited to, economic, political, public health, and other crises and responses by governments and companies to such crises. Not all U.S. government debt securities are guaranteed by the U.S. government—some are backed only by the issuing agency, which must rely on its own resources to repay the debt. The Fund's yield will fluctuate with changes in short-term interest rates.Equity Securities Risk: Investments in common stocks and other equity securities are particularly subject to the risk of changing economic, stock market, industry and company conditions and the risks inherent in the portfolio managers' ability to anticipate such changes that can adversely affect the value of the Fund's holdings.Value Stock Risk: Value stocks may never reach what a Subadvisor believes is their full value or they may go down in value. In addition, different types of stocks tend to shift in and out of favor depending on market and economic conditions, and therefore the Fund's performance may be lower or higher than that of funds that invest in other types of equity securities.Market Capitalization Risk: To the extent the Fund invests in securities issued by small-, mid-, or large-cap companies, the Fund will be subject to the risks associated with securities issued by companies of the applicable market capitalization. Securities of small-cap and mid-cap companies may be subject to greater price volatility, significantly lower trading volumes, cyclical, static or moderate growth prospects and greater spreads between their bid and ask prices than securities of larger companies. Smaller capitalization companies frequently rely on narrower product lines and niche markets and may be more vulnerable to adverse business or market developments. Securities issued by larger companies may have less growth potential and may not be able to attain the high growth rates of successful smaller companies, especially during strong economic periods. In addition, larger companies may be less capable of responding quickly to competitive challenges and industry changes, including those resulting from improvements in technology, and may suffer sharper price declines as a result of earnings disappointments. There is a risk that the securities issued by companies of a certain market capitalization may underperform the broader market at any given time.High-Yield Securities Risk: Investments in high-yield securities or non-investment grade securities (commonly referred to as "junk bonds") are considered speculative because investments in such securities present a greater risk of loss than investments in higher quality securities. Such securities may, under certain circumstances, be less liquid than higher rated securities. These securities pay investors a premium (a high interest rate or yield) because of the potential illiquidity and increased risk of loss. These securities can also be subject to greater price volatility. In times of unusual or adverse market, economic or political conditions, these securities may experience higher than normal default rates.Loan Participation Interest Risk: There may not be a readily available market for loan participation interests, which in some cases could result in the Fund disposing of such interests at a substantial discount from face value or holding such interests until maturity. In addition, the Fund may be exposed to the credit risk of the underlying corporate borrower as well as the lending institution or other participant from whom the Fund purchased the loan participation interests. The Fund may not always have direct recourse against a borrower if the borrower fails to pay scheduled principal and/or interest and may be subject to greater delays, expenses and risks than if the Fund had purchased a direct obligation of the borrower. Substantial increases in interest rates may cause an increase in loan obligation defaults.Floating Rate Loans Risk: The floating rate loans in which the Fund invests are usually rated below investment grade, or if unrated, determined by a Subadvisor to be of comparable quality (commonly referred to as "junk bonds") and are generally considered speculative because they present a greater risk of loss, including default, than higher quality debt instruments. Moreover, such investments may, under certain circumstances, be particularly susceptible to liquidity and valuation risks. Although certain floating rate loans are collateralized, there is no guarantee that the value of the collateral will be sufficient or available to satisfy the borrower’s obligation. In times of unusual or adverse market, economic or political conditions, floating rate loans may experience higher than normal default rates. In the event of a recession or serious credit event, among other eventualities, the value of the Fund's investments in floating rate loans are more likely to decline. The secondary market for floating rate loans is limited and, thus, the Fund’s ability to sell or realize the full value of its investment in these loans to reinvest sale proceeds or to meet redemption obligations may be impaired. In addition, floating rate loans generally are subject to extended settlement periods that may be longer than seven days. As a result, the Fund may be adversely affected by selling other investments at an unfavorable time and/or under unfavorable conditions or engaging in borrowing transactions, such as borrowing against its credit facility, to raise cash to meet redemption obligations or pursue other investment opportunities.In certain circumstances, floating rate loans may not be deemed to be securities. As a result, the Fund may not have the protection of the anti-fraud provisions of the federal securities laws. In such cases, the Fund generally must rely on the contractual provisions in the loan agreement and common-law fraud protections under applicable state law. Floating rate loans and other similar debt obligations that lack financial maintenance covenants or possess fewer or contingent financial maintenance covenants and other financial protections for lenders and investors (sometimes referred to as “covenant-lite” loans or obligations) are generally subject to more risk than investments that contain traditional financial maintenance covenants and financial reporting requirements.The terms of many floating rate loans and other instruments are tied to the London Interbank Offered Rate (“LIBOR”) or the Secured Overnight Financing Rate ("SOFR"), which function as reference rates or benchmarks. Certain LIBOR tenors were discontinued at the end of 2021, but the most widely used LIBOR tenors may continue to be provided on a representative basis until mid-2023. There remains uncertainty regarding the future use of LIBOR and the nature of any replacement rate, such as SOFR. As such, the potential effect of a transition away from LIBOR tenors may cause increased volatility and illiquidity in the markets for instruments with terms tied to LIBOR or other adverse consequences for these instruments. This may adversely affect the Fund and its investments in such instruments.Mortgage-Related and Other Asset-Backed Securities Risk: Investments in mortgage-related securities (such as mortgage-backed securities) and other asset-backed securities generally involve a stream of payments based on the underlying obligations. These payments, which are often part interest and part return of principal, vary based on the rate at which the underlying borrowers repay their loans or other obligations. Asset-backed securities are subject to the risk that borrowers may default on the underlying obligations and that, during periods of falling interest rates, these obligations may be called or prepaid and, during periods of rising interest rates, obligations may be paid more slowly than expected. Impairment of the underlying obligations or collateral, such as by non-payment, will reduce the security's value. Enforcing rights against such collateral in events of default may be difficult or insufficient. The value of these securities may be significantly affected by changes in interest rates, the market's perception of issuers, and the creditworthiness of the parties involved. The ability of the Fund to successfully utilize these instruments may depend on the ability of a Subadvisor to forecast interest rates and other economic factors correctly. These securities may have a structure that makes their reaction to interest rate changes and other factors difficult to predict, making their value highly volatile.Mortgage Dollar Roll Transaction Risk: A mortgage dollar roll is a transaction in which the Fund sells mortgage-related securities from its portfolio to a counterparty from whom it simultaneously agrees to buy a similar security on a delayed delivery basis. Mortgage dollar roll transactions are subject to certain risks, including the risk that securities returned to the Fund at the end of the roll, while substantially similar, may be inferior to what was initially sold to the counterparty.TBA Securities Risk: In a TBA securities transaction, the Fund commits to purchase certain securities for a fixed price at a future date. The principal risks of a TBA securities transaction are that the counterparty may not deliver the security as promised and/or that the value of the TBA security may decline prior to when the Fund receives the security.Foreign Securities Risk: Investments in foreign (non-U.S.) securities may be riskier than investments in U.S. securities. Foreign regulatory regimes and securities markets can have less stringent investor protections and disclosure standards and less liquid trading markets than U.S. regulatory regimes and securities markets, and can experience political, social and economic developments that may affect the value of the Fund's investments in foreign securities. Foreign securities may also subject the Fund's investments to changes in currency rates. Changes in the value of foreign currencies may make the return on an investment increase or decrease, unrelated to the quality or performance of the investment itself. These risks may be greater with respect to securities of companies that conduct their business activities in emerging markets or whose securities are traded principally in emerging markets.Convertible Securities Risk: Convertible securities are typically subordinate to an issuer’s other debt obligations. In part, the total return for a convertible security depends upon the performance of the underlying stock into which it can be converted. Also, issuers of convertible securities are often not as strong financially as those issuing securities with higher credit ratings, are more likely to encounter financial difficulties and typically are more vulnerable to changes in the economy, such as a recession or a sustained period of rising interest rates, which could affect their ability to make interest and principal payments. If an issuer stops making interest and/or principal payments, the Fund could lose its entire investment.Derivatives Risk: Derivatives are investments whose value depends on (or is derived from) the value of an underlying instrument, such as a security, asset, reference rate or index. Derivative strategies may expose the Fund to greater risk than if it had invested directly in the underlying instrument and often involve leverage, which may exaggerate a loss, potentially causing the Fund to lose more money than it originally invested and would have lost had it invested directly in the underlying instrument. For example, if the Fund is the seller of credit protection in a credit default swap, the Fund effectively adds leverage to its portfolio and is subject to the credit exposure on the full notional value of the swap. Derivatives may be difficult to sell, unwind and/or value. Derivatives may also be subject to counterparty risk, which is the risk that the counterparty (the party on the other side of the transaction) on a derivative transaction will be unable or unwilling to honor its contractual obligations to the Fund. Futures may be more volatile than direct investments in the instrument underlying the contract, and may not correlate perfectly to the underlying instrument. Futures and other derivatives also may involve a small initial investment relative to the risk assumed, which could result in losses greater than if they had not been used. Due to fluctuations in the price of the underlying instrument, the Fund may not be able to profitably exercise an option and may lose its entire investment in an option. To the extent that the Fund writes or sells an option, if the decline in the value of the underlying instrument is significantly below the exercise price in the case of a written put option or increase above the exercise price in the case of a written call option, the Fund could experience a substantial loss. Forward commitments entail the risk that the instrument may be worth less when it is issued or received than the price the Fund agreed to pay when it made the commitment. The use of foreign currency forwards may result in currency exchange losses due to fluctuations in currency exchange rates or an imperfect correlation between portfolio holdings denominated in a particular currency and the forward contracts entered into by the Fund. Swaps may be subject to counterparty credit, correlation, valuation, liquidity and leveraging risks. Swap transactions tend to shift a Fund's investment exposure from one type of investment to another and may entail the risk that a party will default on its payment obligations to the Fund. Additionally, applicable regulators have adopted rules imposing certain margin requirements, including minimums on uncleared swaps, which may result in the Fund and its counterparties posting higher margin amounts for uncleared swaps. Certain standardized swaps are subject to mandatory central clearing and exchange trading. Central clearing, which interposes a central clearinghouse to each participant’s swap, and exchange trading are intended to reduce counterparty credit risk and increase liquidity but neither makes swap transactions risk-free. Derivatives may also increase the expenses of the Fund. Liquidity and Valuation Risk: The Fund’s investments may be illiquid at the time of purchase or liquid at the time of purchase and subsequently become illiquid due to, among other things, events relating to the issuer of the securities, market events, operational issues, economic conditions, investor perceptions or lack of market participants. The lack of an active trading market may make it difficult to sell or obtain an accurate price for a security. If market conditions or issuer specific developments make it difficult to value securities, the Fund may value these securities using more subjective methods, such as fair value pricing. In such cases, the value determined for a security could be different than the value realized upon such security's sale. As a result, an investor could pay more than the market value when buying shares or receive less than the market value when selling shares. This could affect the proceeds of any redemption or the number of shares an investor receives upon purchase. The Fund is subject to the risk that it could not meet redemption requests within the allowable time period without significant dilution of remaining investors' interests in the Fund. To meet redemption requests or to raise cash to pursue other investment opportunities, the Fund may be forced to sell securities at an unfavorable time and/or under unfavorable conditions, which may adversely affect the Fund’s performance. These risks are heightened for fixed-income instruments because of the current low interest rate environment.Money Market/Short-Term Securities Risk: To the extent the Fund holds cash or invests in money market or short-term securities, the Fund may be less likely to achieve its investment objective. In addition, it is possible that the Fund's investments in these instruments could lose money. You can lose money by investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. Past Performance The following bar chart and table indicate some of the risks of investing in the Fund. The bar chart shows you how the Fund's calendar year performance has varied over time. Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown. The average annual total returns table shows how the Fund's average annual total returns (before and after taxes) compare to those of two broad-based securities market indices and to the Blended Benchmark Index, a composite representation prepared by the Manager of the performance of the Fund's asset classes weighted according to their respective weightings in the Fund's target range. The Blended Benchmark Index is comprised of the MSCI World Index (Net) and the Bloomberg U.S. Aggregate Bond Index weighted 60%/40%, respectively. The Fund has selected the MSCI World Index (Net) as its primary benchmark. The MSCI World Index (Net) is a free float-adjusted market capitalization weighted Index that is designed to measure the equity market performance of developed markets. The Fund has selected the Bloomberg U.S. Aggregate Bond Index as an additional benchmark. The Bloomberg U.S. Aggregate Bond Index is a broad-based benchmark that measures the investment grade, U.S. dollar-denominated, fixed-rate taxable bond market, including Treasuries, government-related and corporate securities, mortgage-backed securities (agency fixed-rate and hybrid adjustable rate mortgage pass-throughs), asset-backed securities, and commercial mortgage-backed securities. Index returns reflect no deductions for fees, expenses or taxes, except for foreign withholding taxes where applicable.Performance data for the classes varies based on differences in their fee and expense structures. Performance data is not shown for classes with less than one calendar year of performance. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Please visit newyorklifeinvestments.com/funds for more recent performance information. The following bar chart and table indicate some of the risks of investing in the Fund. Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown. The Fund has selected the MSCI World Index (Net) as its primary benchmark. Performance data is not shown for classes with less than one calendar year of performance. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. newyorklifeinvestments.com/funds Annual Returns, Class I Shares(by calendar year 2012-2021) <table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="89%"><tr style="font-size:1pt;"><td style="width:61.54%;"> </td><td style="width:29.49%;"> </td><td style="width:8.98%;"> </td></tr><tr><td colspan="2" style="vertical-align:bottom; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000;">Best Quarter</td><td style="vertical-align:top; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; font-size:1pt;"> </td></tr><tr><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">2020, Q2</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">10.31</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">%</td></tr><tr><td colspan="2" style="vertical-align:bottom; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.25pt; border-top-style:solid; border-top-color:#000000;">Worst Quarter</td><td style="vertical-align:top; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.25pt; border-top-style:solid; border-top-color:#000000; font-size:1pt;"> </td></tr><tr><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">2020, Q1</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">-14.02</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">%</td></tr></table> Best Quarter 2020-06-30 0.1031 Worst Quarter 2020-03-31 -0.1402 Average Annual Total Returns (for the periods ended December 31, 2021) 2004-01-02 0.1028 0.0829 0.0875 0.0769 0.0655 0.0698 0.0692 0.0599 0.0649 1995-01-03 0.0676 0.0681 0.0787 2008-02-28 0.0710 0.0666 0.0767 1987-12-29 0.0400 0.0675 0.0747 1998-09-01 0.0802 0.0706 0.0748 2015-02-27 0.0995 0.0794 0.0596 2016-02-29 0.0963 0.0766 0.0844 2018-02-28 0.1042 0.0854 2020-08-31 0.0957 0.1245 MSCI World Index (Net) 0.2182 0.1503 0.1270 Bloomberg U.S. Aggregate Bond Index -0.0154 0.0357 0.0290 Blended Benchmark Index 0.1204 0.1062 0.0892 After-tax returns are calculated using the highest individual federal marginal income tax rates in effect at the time of each distribution or capital gain or upon the sale of Fund shares, and do not reflect the impact of state and local taxes. In some cases, the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns are not relevant if you hold your shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns shown are for Class I shares. After-tax returns for the other share classes may vary. After-tax returns are calculated using the highest individual federal marginal income tax rates in effect at the time of each distribution or capital gain or upon the sale of Fund shares, and do not reflect the impact of state and local taxes. In some cases, the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns are not relevant if you hold your shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns shown are for Class I shares. After-tax returns for the other share classes may vary. MainStay MacKay Convertible Fund Investment Objective The Fund seeks capital appreciation together with current income. Fees and Expenses of the Fund The table below describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the MainStay Funds. This amount may vary depending on the MainStay Fund in which you invest. In addition, different financial intermediary firms and financial professionals may impose different sales loads and waivers. More information about these and other discounts or waivers is available from your financial professional, in the "Information on Sales Charges" section starting on page 133 of the Prospectus and Appendix A – Intermediary-Specific Sales Charge Waivers and Discounts, and in the "Alternative Sales Arrangements" section on page 142 of the Statement of Additional Information. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the MainStay Funds. 50000 Shareholder Fees (fees paid directly from your investment) 0.0550 0.0500 0 0 0 0 0 0.0500 0.0100 0 Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) 0.0054 0.0054 0.0054 0.0054 0.0054 0.0025 0.0025 0.0100 0.0100 0 0.0013 0.0034 0.0034 0.0034 0.0013 0.0092 0.0113 0.0188 0.0188 0.0067 0.0000 0.0000 0.0000 0.0000 -0.0006 0.0092 0.0113 0.0188 0.0188 0.0061 Example The Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated whether or not you redeem all of your shares at the end of those periods (except as indicated with respect to Class B and Class C shares). The Example reflects Class B and Class C shares converting into Investor Class shares in years 9-10; expenses could be lower if you are eligible to convert to Class A shares instead. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. The Example reflects the contractual fee waiver and/or expense reimbursement arrangement, if applicable, for the current duration of the arrangement only. Although your actual costs may be higher or lower, based on these assumptions your costs would be: Assuming no redemption Assuming redemption at end of period 639 609 191 691 191 291 62 827 841 591 891 591 591 208 1031 1091 1016 1216 1016 1016 367 1619 1806 2005 2005 2005 2005 829 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 49% of the average value of its portfolio. 0.49 Principal Investment Strategies The Fund, under normal circumstances, invests at least 80% of its assets (net assets plus any borrowings for investment purposes) in "convertible securities" such as bonds, debentures, corporate notes, and preferred stocks or other securities that are convertible into common stock or the cash value of a stock or a basket or index of equity securities. The balance of the Fund may be invested or held in non-convertible debt, equity securities that do not pay regular dividends, U.S. government securities, and cash or cash equivalents.Investment Process: The Fund takes a flexible approach by investing in a broad range of securities of a variety of companies and industries. The Fund invests in investment grade and below investment grade debt securities. Below investment grade securities are generally securities that receive low ratings from a nationally recognized statistical rating organization (“NRSRO”), or if unrated, are determined to be of equivalent quality by MacKay Shields LLC, the Fund's Subadvisor. Securities that are rated below investment grade by independent rating agencies are commonly referred to as “high-yield securities” or "junk bonds." The Subadvisor may also invest without restriction in securities with lower ratings from a NRSRO. If NRSROs assign different ratings to the same security, the Fund will use the higher rating for purposes of determining the security's credit quality.In selecting convertible securities for purchase or sale, the Subadvisor takes into account a variety of investment considerations, including the potential return of the common stock into which the convertible security is convertible, credit risk, projected interest return, and the premium for the convertible security relative to the underlying common stock. The Subadvisor’s investment process includes a risk analysis that gives consideration to a variety of security-specific risks, including but not limited to, environmental, social and governance (“ESG”) risks that may have a material impact on the performance of a security. In addition to proprietary research, the Subadvisor may use third-party screening tools and rating systems to identify ESG risk factors that may not have been captured through its own research. The Subadvisor’s consideration of ESG risk is weighed against other criteria and therefore does not mean that any sectors, industries or individual securities are explicitly excluded from the Fund. The Fund may also invest in "synthetic" convertible securities, which are derivative positions composed of two or more securities whose investment characteristics, taken together, resemble those of traditional convertible securities. Unlike traditional convertible securities whose conversion values are based on the common stock of the issuer of the convertible security, "synthetic" and "exchangeable" convertible securities are preferred stocks or debt obligations of an issuer which are structured with an embedded equity component whose conversion value is based on the value of the common stocks of one or more different issuers or a particular benchmark (which may include indices, baskets of domestic stocks, commodities, a foreign issuer or basket of foreign stocks, or a company whose stock is not yet publicly traded). The value of a synthetic convertible is the sum of the values of its preferred stock or debt obligation component and its convertible component.The Fund may invest in foreign securities, which are securities issued by companies organized outside the United States or that trade primarily in non-U.S. securities markets. Generally, an issuer of a security is considered to be U.S. or foreign based on the issuer's "country of risk," as determined by a third-party service provider such as Bloomberg.The Subadvisor may sell a security if it believes the security will no longer contribute to meeting the investment objective of the Fund. In considering whether to sell a security, the Subadvisor may evaluate, among other things, the condition of the economy, meaningful changes in the issuer's financial condition, changes in credit risk, and changes in projected interest return. Principal Risks You can lose money by investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. The investments selected by the Subadvisor may underperform the market in which the Fund invests or other investments. The Fund may receive large purchase or redemption orders which may have adverse effects on performance if the Fund were required to sell securities, invest cash or hold a relatively large amount of cash at times when it would not otherwise do so. The principal risks of investing in the Fund are summarized below. Market Risk: The value of the Fund’s investments may fluctuate because of changes in the markets in which the Fund invests, which could cause the Fund to underperform other funds with similar investment objectives and strategies. Such changes may be rapid and unpredictable. From time to time, markets may experience periods of stress for potentially prolonged periods that may result in: (i) increased market volatility; (ii) reduced market liquidity; and (iii) increased redemptions of Fund shares. Such conditions may add significantly to the risk of volatility in the net asset value of the Fund's shares. Portfolio Management Risk: The investment strategies, practices and risk analyses used by the Subadvisor may not produce the desired results. The Subadvisor may give consideration to certain ESG criteria when evaluating an investment opportunity. The application of ESG criteria may result in the Fund (i) having exposure to certain securities or industry sectors that are significantly different than the composition of the Fund's benchmark; and (ii) performing differently than other funds and strategies in its peer group that do not take into account ESG criteria or the Fund's benchmark. Yield Risk: There can be no guarantee that the Fund will achieve or maintain any particular level of yield.Convertible Securities Risk: Convertible securities are typically subordinate to an issuer’s other debt obligations. In part, the total return for a convertible security depends upon the performance of the underlying stock into which it can be converted. Also, issuers of convertible securities are often not as strong financially as those issuing securities with higher credit ratings, are more likely to encounter financial difficulties and typically are more vulnerable to changes in the economy, such as a recession or a sustained period of rising interest rates, which could affect their ability to make interest and principal payments. If an issuer stops making interest and/or principal payments, the Fund could lose its entire investment.Synthetic Convertible Securities Risk: The values of a synthetic convertible and a true convertible security may respond differently to market fluctuations. In addition, in purchasing a synthetic convertible security, the Fund may have counterparty (including counterparty credit) risk with respect to the financial institution or investment bank that offers the instrument.Debt Securities Risk: The risks of investing in debt or fixed-income securities include (without limitation): (i) credit risk, e.g., the issuer or guarantor of a debt security may be unable or unwilling (or be perceived as unable or unwilling) to make timely principal and/or interest payments or otherwise honor its obligations, or changes in an issuer’s credit rating or the market’s perception of an issuer’s creditworthiness may affect the value of the Fund’s investments; (ii) maturity risk, e.g., a debt security with a longer maturity may fluctuate in value more than one with a shorter maturity; (iii) market risk, e.g., low demand for debt securities may negatively impact their price; (iv) interest rate risk, e.g., when interest rates go up, the value of a debt security generally goes down, and when interest rates go down, the value of a debt security generally goes up (long-term debt securities are generally more susceptible to interest rate risk than short-term debt securities); and (v) call or prepayment risk, e.g., during a period of falling interest rates, the issuer may redeem a security by repaying it early, which may reduce the Fund’s income if the proceeds are reinvested at lower interest rates.Interest rate risk is the risk that the value of the Fund’s investments in fixed income or debt securities will change because of changes in interest rates. There is a risk that interest rates across the financial system may change, possibly significantly and/or rapidly. Changes in interest rates or a lack of market participants may lead to decreased liquidity and increased volatility in the fixed-income or debt markets, making it more difficult for the Fund to sell its fixed-income or debt holdings. Decreased liquidity in the fixed-income or debt markets also may make it more difficult to value some or all of the Fund’s fixed-income or debt holdings. For most fixed-income investments, when market interest rates fall, prices of fixed-rate debt securities rise. However, when market interest rates fall, prices of certain variable and fixed-rate debt securities may be adversely affected (i.e., falling interest rates bring the possibility of prepayment risk, as an instrument may be redeemed before maturity). Very low or negative interest rates may magnify interest rate risk. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, may result in heightened market volatility and may detract from Fund performance to the extent the Fund is exposed to such interest rates and/or volatility. Other factors that may affect the value of debt securities include, but are not limited to, economic, political, public health, and other crises and responses by governments and companies to such crises. Not all U.S. government debt securities are guaranteed by the U.S. government—some are backed only by the issuing agency, which must rely on its own resources to repay the debt. The Fund's yield will fluctuate with changes in short-term interest rates.High-Yield Securities Risk: Investments in high-yield securities or non-investment grade securities (commonly referred to as "junk bonds") are considered speculative because investments in such securities present a greater risk of loss than investments in higher quality securities. Such securities may, under certain circumstances, be less liquid than higher rated securities. These securities pay investors a premium (a high interest rate or yield) because of the potential illiquidity and increased risk of loss. These securities can also be subject to greater price volatility. In times of unusual or adverse market, economic or political conditions, these securities may experience higher than normal default rates.Equity Securities Risk: Investments in common stocks and other equity securities are particularly subject to the risk of changing economic, stock market, industry and company conditions and the risks inherent in the portfolio manager's ability to anticipate such changes that can adversely affect the value of the Fund's holdings.Foreign Securities Risk: Investments in foreign (non-U.S.) securities may be riskier than investments in U.S. securities. Foreign regulatory regimes and securities markets can have less stringent investor protections and disclosure standards and less liquid trading markets than U.S. regulatory regimes and securities markets, and can experience political, social and economic developments that may affect the value of the Fund's investments in foreign securities. Foreign securities may also subject the Fund's investments to changes in currency rates. Changes in the value of foreign currencies may make the return on an investment increase or decrease, unrelated to the quality or performance of the investment itself. These risks may be greater with respect to securities of companies that conduct their business activities in emerging markets or whose securities are traded principally in emerging markets.Liquidity and Valuation Risk: The Fund’s investments may be illiquid at the time of purchase or liquid at the time of purchase and subsequently become illiquid due to, among other things, events relating to the issuer of the securities, market events, operational issues, economic conditions, investor perceptions or lack of market participants. The lack of an active trading market may make it difficult to sell or obtain an accurate price for a security. If market conditions or issuer specific developments make it difficult to value securities, the Fund may value these securities using more subjective methods, such as fair value pricing. In such cases, the value determined for a security could be different than the value realized upon such security's sale. As a result, an investor could pay more than the market value when buying shares or receive less than the market value when selling shares. This could affect the proceeds of any redemption or the number of shares an investor receives upon purchase. The Fund is subject to the risk that it could not meet redemption requests within the allowable time period without significant dilution of remaining investors' interests in the Fund. To meet redemption requests or to raise cash to pursue other investment opportunities, the Fund may be forced to sell securities at an unfavorable time and/or under unfavorable conditions, which may adversely affect the Fund’s performance. These risks are heightened for fixed-income instruments because of the current low interest rate environment.Money Market/Short-Term Securities Risk: To the extent the Fund holds cash or invests in money market or short-term securities, the Fund may be less likely to achieve its investment objective. In addition, it is possible that the Fund's investments in these instruments could lose money.Private Placement and Restricted Securities Risk: The Fund may invest in privately issued securities, including those which may be resold only in accordance with Rule 144A under the Securities Act of 1933, as amended. Securities acquired in a private placement generally are subject to strict restrictions on resale, and there may be no market or a limited market for the resale of such securities. Therefore, the Fund may be unable to dispose of such securities when it desires to do so or at the most favorable price. This potential lack of liquidity also may make it more difficult to accurately value these securities. You can lose money by investing in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency. Past Performance The following bar chart and table indicate some of the risks of investing in the Fund. The bar chart shows you how the Fund's calendar year performance has varied over time. Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown. The average annual total returns table shows how the Fund's average annual total returns (before and after taxes) compare to those of a broad-based securities market index. The Fund has selected the ICE BofA U.S. Convertible Index as its primary benchmark. The ICE BofA U.S. Convertible Index is a market-capitalization weighted index of domestic corporate convertible securities. In order to be included in the ICE BofA U.S. Convertible Index, bonds and preferred stocks must be convertible only to common stock. Index returns reflect no deductions for fees, expenses or taxes, except for foreign withholding taxes where applicable.Performance data for the classes varies based on differences in their fee and expense structures. Performance data is not shown for classes with less than one calendar year of performance. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Please visit newyorklifeinvestments.com/funds for more recent performance information. The following bar chart and table indicate some of the risks of investing in the Fund. Sales loads, if any, are not reflected in the bar chart. If they were, returns would be less than those shown. The Fund has selected the ICE BofA U.S. Convertible Index as its primary benchmark. Performance data is not shown for classes with less than one calendar year of performance. Past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. newyorklifeinvestments.com/funds Annual Returns, Class I Shares(by calendar year 2012-2021) <table cellpadding="0" cellspacing="0" style="border-collapse:collapse" width="89%"><tr style="font-size:1pt;"><td style="width:61.54%;"> </td><td style="width:29.49%;"> </td><td style="width:8.98%;"> </td></tr><tr><td colspan="2" style="vertical-align:bottom; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000;">Best Quarter</td><td style="vertical-align:top; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; font-size:1pt;"> </td></tr><tr><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">2020, Q2</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">23.24</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">%</td></tr><tr><td colspan="2" style="vertical-align:bottom; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.25pt; border-top-style:solid; border-top-color:#000000;">Worst Quarter</td><td style="vertical-align:top; border-bottom:0.75pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.25pt; border-top-style:solid; border-top-color:#000000; font-size:1pt;"> </td></tr><tr><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">2020, Q1</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">-13.81</td><td style="vertical-align:bottom; border-bottom:0.25pt; border-bottom-style:solid; border-bottom-color:#000000; border-top:0.75pt; border-top-style:solid; border-top-color:#000000;">%</td></tr></table> Best Quarter 2020-06-30 0.2324 Worst Quarter 2020-03-31 -0.1381 Average Annual Total Returns (for the periods ended December 31, 2021) 2008-11-28 0.1018 0.1474 0.1254 0.0451 0.1206 0.1007 0.0891 0.1116 0.0945 1995-01-03 0.0383 0.1305 0.1158 2008-02-28 0.0414 0.1286 0.1137 1986-05-01 0.0441 0.1304 0.1116 1998-09-01 0.0794 0.1329 0.1116 ICE BofA U.S. Convertible Index 0.0634 0.1687 0.1389 After-tax returns are calculated using the highest individual federal marginal income tax rates in effect at the time of each distribution or capital gain or upon the sale of Fund shares, and do not reflect the impact of state and local taxes. In some cases, the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns are not relevant if you hold your shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns shown are for Class I shares. After-tax returns for the other share classes may vary. After-tax returns are calculated using the highest individual federal marginal income tax rates in effect at the time of each distribution or capital gain or upon the sale of Fund shares, and do not reflect the impact of state and local taxes. In some cases, the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period. Actual after-tax returns depend on your tax situation and may differ from those shown. After-tax returns are not relevant if you hold your shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns shown are for Class I shares. After-tax returns for the other share classes may vary. 497 2021-10-31 0000787441 false 2022-02-28 2022-02-28 N-1A 0.1949 -0.0544 -0.0127 -0.0202 0.1492 0.1159 -0.0654 0.1568 0.0336 -0.0458 0.1327 0.0635 0.0172 -0.016 0.1578 0.0679 -0.0146 0.1285 0.0512 0.0537 0.1408 0.0414 0.0135 -0.0356 0.0828 0.0495 -0.0157 0.0682 0.0644 0.022 0.0374 -0.0271 0.0508 0.0026 0.0086 0.0217 -0.0046 0.0916 0.0656 0.0062 0.112 -0.0377 0.1276 0.0421 0.007 0.0577 0.0175 0.0784 0.0645 0.023 0.0001 0.0001 0.0001 0.0001 0.0003 0.0045 0.0139 0.0174 0.0026 0.0001 0.1482 0.1871 0.0799 -0.0351 0.0942 0.1237 -0.0535 0.184 0.0725 0.1028 0.0955 0.2569 0.0765 -0.01 0.1169 0.1124 -0.0229 0.2261 0.3544 0.1018 ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule4 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule5 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule6 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule7 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRBarChart8 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule9 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule12 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule13 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule14 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule15 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRBarChart16 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule17 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule20 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule21 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule22 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule23 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRBarChart24 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule25 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule28 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule29 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule30 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule31 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRBarChart32 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule33 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule36 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule37 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule38 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule39 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRBarChart40 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule41 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule44 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule45 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule46 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule47 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRBarChart48 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule49 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule52 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule53 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule54 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule55 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRBarChart56 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule57 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule60 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule61 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule62 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule63 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRBarChart64 ~ ~ http://www.mainstayinvestments.com/20211031/role/RRSchedule65 ~ MAINSTAY FUNDS No initial sales charge applies on investments of $1 million or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. No initial sales charge applies on investments of $1 million or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. February 28, 2023 February 28, 2023 February 28, 2023 February 28, 2023 February 28, 2023 No initial sales charge applies on investments of $1 million or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. No initial sales charge applies on investments of $1 million or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. No initial sales charge applies on investments of $1 million or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. No initial sales charge applies on investments of $1 million or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. February 28, 2023 February 28, 2023 February 28, 2023 February 28, 2023 February 28, 2023 February 28, 2023 February 28, 2023 February 28, 2023 No initial sales charge applies on investments of $250,000 or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. No initial sales charge applies on investments of $250,000 or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. February 28, 2023 February 28, 2023 February 28, 2023 February 28, 2023 February 28, 2023 February 28, 2023 No initial sales charge applies on investments of $250,000 or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. No initial sales charge applies on investments of $250,000 or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. February 28, 2023 February 28, 2023 February 28, 2023 February 28, 2023 February 28, 2023 No initial sales charge applies on investments of $250,000 or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. No initial sales charge applies on investments of $250,000 or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. No initial sales charge applies on investments of $1 million or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. No initial sales charge applies on investments of $1 million or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. February 28, 2023 February 28, 2023 February 28, 2023 February 28, 2023 February 28, 2023 Class B shares are closed to all new purchases as well as additional investments by existing Class B shareholders. No initial sales charge applies on investments of $1 million or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. The management fee is as follows: 0.70% on assets up to $500 million and 0.65% on assets over $500 million. New York Life Investment Management LLC ("New York Life Investments") has contractually agreed to waive fees and/or reimburse expenses so that Total Annual Fund Operating Expenses (excluding taxes, interest, litigation, extraordinary expenses, brokerage and other transaction expenses relating to the purchase or sale of portfolio investments, and acquired (underlying) fund fees and expenses) do not exceed the following percentages of its average daily net assets: Class A, 1.15%; and Class I, 0.85%. New York Life Investments will apply an equivalent waiver or reimbursement, in an equal number of basis points as the Class A shares waiver/reimbursement, to Investor Class, Class B and Class C shares. This agreement will remain in effect until February 28, 2023, and shall renew automatically for one-year terms unless New York Life Investments provides written notice of termination prior to the start of the next term or upon approval of the Board of Trustees of the Fund. New York Life Investments has contractually agreed to limit the transfer agency expenses charged to each of the Fund’s share classes to a maximum of 0.35% of that share class’s average daily net assets on an annual basis after deducting any applicable Fund or class-level expense reimbursements or small account fees. This agreement will remain in effect until February 28, 2023, and shall renew automatically for one-year terms unless New York Life Investments provides written notice of termination prior to the start of the next term or upon approval of the Board of Trustees of the Fund. Class B shares are closed to all new purchases as well as additional investments by existing Class B shareholders. No initial sales charge applies on investments of $1 million or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. The management fee is as follows: 0.60% on assets up to $500 million; 0.55% on assets from $500 million to $5 billion; 0.525% on assets from $5 billion to $7 billion; 0.50% on assets from $7 billion to $10 billion; 0.49% on assets from $10 billion to $15 billion; and 0.48% on assets over $15 billion, plus a fee for fund accounting services previously provided by New York Life Investment Management LLC under a separate fund accounting agreement. This fund accounting services fee amounted to 0.01% of the Fund's average daily net assets. Class B shares are closed to all new purchases as well as additional investments by existing Class B shareholders. No initial sales charge applies on investments of $1 million or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. The management fee is as follows: 0.60% on assets up to $500 million; 0.55% on assets from $500 million up to $1 billion; 0.50% on assets from $1 billion to $5 billion; and 0.475% on assets over $5 billion, plus a fee for fund accounting services previously provided by New York Life Investment Management LLC under a separate fund accounting agreement. This fund accounting services fee amounted to 0.01% of the Fund's average daily net assets. New York Life Investment Management LLC ("New York Life Investments") has contractually agreed to waive fees and/or reimburse expenses so that Total Annual Fund Operating Expenses (excluding taxes, interest expenses (including interest on securities sold short), litigation, extraordinary expenses, brokerage and other transaction expenses relating to the purchase or sale of portfolio investments, and acquired (underlying) fund fees and expenses) for Class I shares do not exceed 0.70% of its average daily net assets. In addition, New York Life Investments will waive fees and/or reimburse expenses so that Total Annual Fund Operating Expenses (excluding taxes, interest expenses (including interest on securities sold short), litigation, extraordinary expenses, brokerage and other transaction expenses relating to the purchase or sale of portfolio investments, and acquired (underlying) fund fees and expenses) for Class R6 do not exceed those of Class I. This agreement will remain in effect until February 28, 2023, and shall renew automatically for one-year terms unless New York Life Investments provides written notice of termination prior to the start of the next term or upon approval of the Board of Trustees of the Fund. Class B shares are closed to all new purchases as well as additional investments by existing Class B shareholders. No initial sales charge applies on investments of $250,000 or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. The management fee is as follows: 0.50% on assets up to $500 million; 0.475% on assets from $500 million to $1 billion; and 0.45% on assets over $1 billion. New York Life Investment Management LLC ("New York Life Investments") has contractually agreed to waive fees and/or reimburse expenses so that Total Annual Fund Operating Expenses (excluding taxes, interest, litigation, extraordinary expenses, brokerage and other transaction expenses relating to the purchase or sale of portfolio investments, and acquired (underlying) fund fees and expenses) for a class do not exceed the following percentage of its average daily net assets: Class A, 0.85% and Class R6, 0.53%. New York Life Investments will apply an equivalent waiver or reimbursement, in an equal number of basis points of the Class A shares waiver/reimbursement to Investor Class, Class B, Class C and Class I shares. This agreement will remain in effect until February 28, 2023, and shall renew automatically for one-year terms unless New York Life Investments provides written notice of termination prior to the start of the next term or upon approval of the Board of Trustees of the Fund. New York Life Investments has contractually agreed to limit the transfer agency expenses charged to each of the Fund’s share classes to a maximum of 0.35% of that share class’s average daily net assets on an annual basis after deducting any applicable Fund or class-level expense reimbursements or small account fees. This agreement will remain in effect until February 28, 2023, and shall renew automatically for one-year terms unless New York Life Investments provides written notice of termination prior to the start of the next term or upon approval of the Board of Trustees of the Fund. Class B shares are closed to all new purchases as well as additional investments by existing Class B shareholders. No initial sales charge applies on investments of $250,000 or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. The management fee is as follows: 0.45% on assets up to $500 million; 0.425% on assets from $500 million to $1 billion; 0.40% on assets from $1 billion to $5 billion; 0.39% on assets from $5 billion to $7 billion; 0.38% on assets from $7 billion to $9 billion; and 0.37% on assets over $ 9 billion, plus a fee for fund accounting services previously provided by New York Life Investment Management LLC under a separate fund accounting agreement. This fund accounting services fee amounted to 0.01% of the Fund's average daily net assets. Class B shares are closed to all new purchases as well as additional investments by existing Class B shareholders. The management fee is as follows: 0.40% on assets up to $500 million; 0.35% on assets from $500 million up to $1 billion; and 0.30% on assets over $1 billion. New York Life Investment Management LLC ("New York Life Investments") has contractually agreed to waive fees and/or reimburse expenses so that Total Annual Fund Operating Expenses (excluding taxes, interest, litigation, extraordinary expenses, brokerage and other transaction expenses relating to the purchase or sale of portfolio investments, and acquired (underlying) fund fees and expenses) do not exceed the following percentages of its average daily net assets: Class A, 0.70%; Investor Class, 0.80%; Class B, 0.80%; Class C, 0.80%; and SIMPLE Class, 0.80%. This agreement will remain in effect until February 28, 2023, and shall renew automatically for one-year terms unless New York Life Investments provides written notice of termination prior to the start of the next term or upon approval of the Board of Trustees of the Fund. Class B shares are closed to all new purchases as well as additional investments by existing Class B shareholders. No initial sales charge applies on investments of $250,000 or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. The management fee is as follows: 0.64% on assets up to $500 million; 0.60% on assets from $500 million up to $1 billion; 0.575% on assets from $1 billion up to $5 billion; and 0.565% on assets over $5 billion, plus a fee for fund accounting services previously provided by New York Life Investment Management LLC under a separate fund accounting agreement. This fund accounting services fee amounted to 0.01% of the Fund's average daily net assets. Class B shares are closed to all new purchases as well as additional investments by existing Class B shareholders. No initial sales charge applies on investments of $1 million or more (and certain other qualified purchases). However, a contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge. The management fee is as follows: 0.60% on assets up to $500 million; 0.55% on assets from $500 million up to $1 billion; 0.50% on assets from $1 billion up to $2 billion; and 0.49% on assets over $2 billion, plus a fee for fund accounting services previously provided by New York Life Investment Management LLC (“New York Life Investments”) under a separate fund accounting agreement. This fund accounting services fee amounted to 0.01% of the Fund's average daily net assets. New York Life Investments has contractually agreed to waive fees and/or reimburse expenses so that Total Annual Fund Operating Expenses (excluding taxes, interest, litigation, extraordinary expenses, brokerage and other transaction expenses relating to the purchase or sale of portfolio investments, and acquired (underlying) fund fees and expenses) for Class I shares do not exceed 0.61% of its average daily net assets. This agreement will remain in effect until February 28, 2023, and shall renew automatically for one-year terms unless New York Life Investments provides written notice of termination prior to the start of the next term or upon approval of the Board of Trustees of the Fund.