Summary Prospectus dated January 1, 2022

as revised April 29, 2022

Eaton Vance Richard Bernstein Equity Strategy Fund

Class /Ticker     A / ERBAX    C / ERBCX     I / ERBIX

This Summary Prospectus is designed to provide investors with key fund information in a clear and concise format. Before you invest, you may want to review the Fund’s Prospectus and Statement of Additional Information, which contain more information about the Fund and its risks. The Fund’s Prospectus and Statement of Additional Information, both dated January 1, 2022, as may be amended or supplemented, are incorporated by reference into this Summary Prospectus. For free paper or electronic copies of the Fund’s Prospectus, Statement of Additional Information, annual and semi-annual shareholder reports, and other information about the Fund, go to http://www.eatonvance.com/funddocuments, email a request to contact@eatonvance.com, call 1-800-262-1122, or ask any financial advisor, bank, or broker-dealer who offers shares of the Fund. Unless otherwise noted, page number references refer to the current Prospectus for this Fund.

Investment Objective

The Fund's investment objective is to seek total return.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. Investors may also pay commissions or other fees to their financial intermediary, which are not reflected below. You may qualify for a reduced sales charge on purchases of Class A shares if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance Funds. Certain financial intermediaries also may offer variations in Fund sales charges to their customers as described in Appendix A – Financial Intermediary Sales Charge Variations in the Fund's Prospectus. More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 40 of the Fund's Prospectus and page 22 of the Fund’s Statement of Additional Information.

Shareholder Fees (fees paid directly from your investment)	Class A	Class C	Class I
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	5.25%	None	None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at time of purchase or redemption)	None	1.00%	None

Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment)	Class A	Class C	Class I
Management Fees	0.86%	0.86%	0.86%
Distribution and Service (12b-1) Fees	0.25%	1.00%	None
Other Expenses	0.10%	0.10%	0.10%
Acquired Fund Fees and Expenses	0.06%	0.06%	0.06%
Total Annual Fund Operating Expenses	1.27%	2.02%	1.02%

Example. This 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 and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year, that the operating expenses remain the same and that any expense reimbursement arrangement remains in place for the contractual period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

	Expenses with Redemption				Expenses without Redemption
	1 Year	3 Years	5 Years	10 Years	1 Year	3 Years	5 Years	10 Years
Class A  shares	$648	$907	$1,185	$1,978	$648	$907	$1,185	$1,978
Class C shares	$305	$634	$1,088	$2,155	$205	$634	$1,088	$2,155
Class I shares	$104	$325	$563	$1,248	$104	$325	$563	$1,248

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the 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 31% of the average value of its portfolio.

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities and derivative instruments that provide exposure to equity securities (the “80% Policy”). The Fund may invest up to 20% of its net assets in fixed-income securities, including securities rated below investment grade and comparable unrated securities (“junk”); other fixed and floating-rate income instruments; and/or in currencies. The Fund may invest an unlimited amount of its assets in foreign securities issued by companies domiciled in developed or emerging market countries including frontier markets. Such investments may include securities denominated in foreign currencies and securities trading in the form of depositary receipts. The Fund may invest in stocks of companies of any capitalization, publicly traded real estate investment trusts (“REITs”) and exchange-traded notes (“ETNs”). The Fund may invest in exchange-traded funds (“ETFs”), a type of pooled investment vehicle, in order to manage cash positions or seek exposure to certain markets or market sectors. The Fund may invest in certain ETFs beyond the limits under the Investment Company Act of 1940, as amended (the “1940 Act”), subject to certain terms and conditions.

The Fund may engage in derivative transactions to seek return, to seek to hedge against fluctuations in securities prices, interest rates or currency exchange rates, or as a substitute for the purchase or sale of securities or currencies. The Fund expects to use derivatives principally when seeking to gain exposure to equity securities using futures contracts on securities indices and/or when seeking to gain or reduce exposure to certain currencies by buying or selling forward foreign currency exchange contracts. However, the Fund may also purchase or sell forwards or other types of futures contracts; options on futures contracts; exchange-traded and over-the-counter options; equity collars; equity-linked securities; equity swap agreements and other derivatives as described in the prospectus. The Fund may also engage in covered short sales (on individual securities held or on an index or basket of securities whose constituents are held in whole or in part or for which liquid assets have been segregated) and forward commitments. There is no stated limit on the Fund’s use of derivatives. The Fund may also lend its securities.

The Fund is managed in a macro-driven, top-down style that emphasizes and de-emphasizes various global equity market segments at different times. Market segments chosen for emphasis and/or de-emphasis may vary from general market consensus views and the Fund may at times seek to identify areas where, in the sub-adviser’s opinion, there is scarcity of capital and/or potentially overlooked investment opportunities. In using this “beta” management style, leading exposures will vary among growth and value; small, mid and large cap; U.S. and non-U.S., and developed and emerging markets, based on the sub-adviser’s assessment of a range of proprietary and non-proprietary quantitative indicators and the firm’s macro-economic analysis and judgment. It is expected that the macro-economic factors and indicators will evolve over time and may include the following: global equity market valuations; global yield curves; asset class, regional, and country correlations; profit cycle analyses and style and sector rotation; expected beta; estimate revisions and earnings surprises; investor sentiment and other factors. In selecting securities and other instruments, the portfolio managers employ quantitative screening and optimization tools to achieve desired market exposures while seeking to manage stock-specific and other observable market risks. The portfolio is monitored on an ongoing basis and rebalanced as necessary to seek to ensure that desired market exposures and risk parameters are maintained. Stocks may be sold if they exhibit performance that might counteract the desired exposures or to implement a revised allocation based on a modified top-down view. A security may also be sold if the sub-adviser believes it exhibits unusual volatility or price movement.

The Fund will exercise a flexible strategy and is not limited by investment style or by an issuer’s location, size, market capitalization or industry sector. The strategy may have none, some or all of its assets invested in a particular market segment at a given time, and across market segments in relative proportions that change over time. At any time, up to 100% of the Fund’s assets may be invested in either U.S. or foreign securities, including issuers domiciled in emerging market countries.

Principal Risks

Market Risk. The value of investments held by the Fund may increase or decrease in response to economic, political, financial, public health crises (such as epidemics or pandemics) or other disruptive events (whether real, expected or perceived) in the U.S. and global markets. These events may negatively impact broad segments of businesses and populations and may exacerbate pre-existing risks to the Fund. The frequency and magnitude of resulting changes in the value of the Fund’s investments cannot be predicted. Certain securities and other investments held by the Fund may experience increased volatility, illiquidity, or other potentially adverse effects in reaction to changing market conditions. Monetary and/or fiscal actions taken by U.S. or foreign governments to stimulate or stabilize the global economy may not be effective and could lead to high market volatility. No active trading market may exist for certain investments held by the Fund, which may impair the ability of the Fund to sell or to realize the current valuation of such investments in the event of the need to liquidate such assets.

Eaton Vance Richard Bernstein Equity Strategy Fund 2 Summary Prospectus dated January 1, 2022 as revised April 29, 2022

Equity Securities Risk. The value of equity securities and related instruments may decline in response to adverse changes in the economy or the economic outlook; deterioration in investor sentiment; interest rate, currency, and commodity price fluctuations; adverse geopolitical, social or environmental developments; issuer and sector-specific considerations; unexpected trading activity among retail investors; or other factors. Market conditions may affect certain types of stocks to a greater extent than other types of stocks. If the stock market declines in value, the value of the Fund’s equity securities will also likely decline. Although prices can rebound, there is no assurance that values will return to previous levels.

Smaller Company Risk. The stocks of smaller, less seasoned companies are generally subject to greater price fluctuations, limited liquidity, higher transaction costs and higher investment risk than the stocks of larger, more established companies. Such companies may have limited product lines, markets or financial resources, may be dependent on a limited management group, and may lack substantial capital reserves or an established performance record. There may be generally less publicly available information about such companies than for larger, more established companies. Stocks of these companies frequently have lower trading volumes making them more volatile and potentially more difficult to value.

Foreign Investment Risk. Foreign investments can be adversely affected by political, economic and market developments abroad, including the imposition of economic and other sanctions by the United States or another country. There may be less publicly available information about foreign issuers because they may not be subject to reporting practices, requirements or regulations comparable to those to which United States companies are subject. Foreign markets may be smaller, less liquid and more volatile than the major markets in the United States and, as a result, Fund share values may be more volatile. Trading in foreign markets typically involves higher expense than trading in the United States. The Fund may have difficulties enforcing its legal or contractual rights in a foreign country. Depositary receipts are subject to many of the risks associated with investing directly in foreign instruments.

Emerging Markets Investment Risk. Investment markets within emerging market countries are typically smaller, less liquid, less developed and more volatile than those in more developed markets like the United States, and may be focused in certain economic sectors. Emerging market securities often involve greater risks than developed market securities. The information available about an emerging market issuer may be less reliable than for comparable issuers in more developed capital markets. Such risks may be greater in frontier markets.

Currency Risk. Exchange rates for currencies fluctuate daily. The value of foreign investments may be affected favorably or unfavorably by changes in currency exchange rates in relation to the U.S. dollar. Currency markets generally are not as regulated as securities markets and currency transactions are subject to settlement, custodial and other operational risks.

ETF Risk. ETFs are subject to the risks of investing in the underlying securities or other investments. ETF shares may trade at a premium or discount to net asset value and are subject to secondary market trading risks. In addition, the Fund will bear a pro rata portion of the operating expenses of an ETF in which it invests. Other pooled investment vehicles generally are subject to risks similar to those of ETFs.

Sector Risk. Because the Fund may, under certain market conditions, invest a significant portion of its assets in one or more sectors, the value of Fund shares may be affected by events that adversely affect such sector(s) and may fluctuate more than that of a fund that invests more broadly.

Credit Risk. Investments in fixed income and other debt obligations, including loans, (referred to below as “debt instruments”) are subject to the risk of non-payment of scheduled principal and interest. Changes in economic conditions or other circumstances may reduce the capacity of the party obligated to make principal and interest payments on such instruments and may lead to defaults. Such non-payments and defaults may reduce the value of Fund shares and income distributions. The value of debt instruments also may decline because of concerns about the issuer’s ability to make principal and interest payments. In addition, the credit ratings of debt instruments may be lowered if the financial condition of the party obligated to make payments with respect to such instruments deteriorates. In the event of bankruptcy of the issuer of a debt instrument, the Fund could experience delays or limitations with respect to its ability to realize the benefits of any collateral securing the instrument. In order to enforce its rights in the event of a default, bankruptcy or similar situation, the Fund may be required to retain legal or similar counsel, which may increase the Fund’s operating expenses and adversely affect net asset value.

Eaton Vance Richard Bernstein Equity Strategy Fund 3 Summary Prospectus dated January 1, 2022 as revised April 29, 2022

Interest Rate Risk. In general, the value of income securities will fluctuate based on changes in interest rates. The value of these securities is likely to increase when interest rates fall and decline when interest rates rise. Duration measures the time-weighted expected cash flows of a fixed-income security, while maturity refers to the amount of time until a fixed-income security matures. Generally, securities with longer durations or maturities are more sensitive to changes in interest rates than securities with shorter durations or maturities, causing them to be more volatile. Conversely, fixed-income securities with shorter durations or maturities will be less volatile but may provide lower returns than fixed-income securities with longer durations or maturities. In a rising interest rate environment, the duration of income securities that have the ability to be prepaid or called by the issuer may be extended. In a declining interest rate environment, the proceeds from prepaid or maturing instruments may have to be reinvested at a lower interest rate. Certain instruments held by the Fund may pay an interest rate based on the London Interbank Offered Rate (“LIBOR”), which is the average offered rate for various maturities of short-term loans between certain major international banks. LIBOR is used throughout global banking and financial industries to determine interest rates for a variety of financial instruments (such as debt instruments and derivatives) and borrowing arrangements. The ICE Benchmark Administration Limited, the administrator of LIBOR, is expected to cease publishing certain LIBOR settings on December 31, 2021, and the remaining LIBOR settings on June 30, 2023. Although the transition process away from LIBOR has become increasingly well defined in advance of the anticipated discontinuation, the impact on certain debt securities, derivatives and other financial instruments that utilize LIBOR remains uncertain. The phase-out of LIBOR may result in, among other things, increased volatility or illiquidity in markets for instruments based on LIBOR and changes in the value of such instruments.

Lower Rated Investments Risk. Investments rated below investment grade and comparable unrated investments (sometimes referred to as “junk”) have speculative characteristics because of the credit risk associated with their issuers. Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments. An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs. Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Derivatives Risk. The Fund’s exposure to derivatives involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other investments. The use of derivatives can lead to losses because of adverse movements in the price or value of the security, instrument, index, currency, commodity, economic indicator or event underlying a derivative (“reference instrument”), due to failure of a counterparty or due to tax or regulatory constraints. Derivatives may create leverage in the Fund, which represents a non-cash exposure to the underlying reference instrument. Leverage can increase both the risk and return potential of the Fund. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund. Use of derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events. Changes in the value of a derivative (including one used for hedging) may not correlate perfectly with the underlying reference instrument. Derivative instruments traded in over-the-counter markets may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying reference instrument. If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty. The loss on derivative transactions may substantially exceed the initial investment, particularly when there is no stated limit on the Fund’s use of derivatives. A derivative investment also involves the risks relating to the reference instrument underlying the investment.

When-Issued and Forward Commitment Risk. Securities purchased on a when-issued or forward commitment basis are subject to the risk that when delivered they will be worth less than the agreed upon payment price.

ETN Risk. ETNs are debt obligations and their payments of interest or principal are linked to the performance of a reference investment (typically an index). ETNs are subject to the performance of their issuer and may lose all or a portion of their entire value if the issuer fails or its credit rating changes. An ETN that is tied to a specific index may not be able to replicate and maintain exactly the composition and weighting of the components of that index.  ETNs also incur certain expenses not incurred by the reference investment and the cost of owning an ETN may exceed the cost of investing directly in the reference investment.  The market trading price of an ETN may be more volatile than the reference investment it is designed to track. The Fund may purchase an ETN at prices that exceed its net asset value and may sell such investments at prices below such net asset value. The Fund may not be able to liquidate ETN holdings at the time and price desired, which may impact Fund performance.

Real Estate Risk. Real estate investments are subject to risks associated with owning real estate, including declines in real estate values, increases in property taxes, fluctuations in interest rates, limited availability of mortgage financing, decreases in revenues from underlying real estate assets, declines in occupancy rates, changes in government regulations affecting zoning, land use, and rents, environmental liabilities, and risks related to the management skill and creditworthiness of the issuer. Companies in the real estate industry may also be subject to liabilities under environmental and hazardous waste laws, among others. REITs must satisfy specific requirements for favorable tax treatment and can involve unique risks in addition to the risks generally affecting the real estate industry. Changes in underlying real estate values may have an exaggerated effect to the extent that investments are concentrated in particular geographic regions or property types.

Eaton Vance Richard Bernstein Equity Strategy Fund 4 Summary Prospectus dated January 1, 2022 as revised April 29, 2022

Liquidity Risk. The Fund is exposed to liquidity risk when trading volume, lack of a market maker or trading partner, large position size, market conditions, or legal restrictions impair its ability to sell particular investments or to sell them at advantageous market prices. Consequently, the Fund may have to accept a lower price to sell an investment or continue to hold it or keep the position open, sell other investments to raise cash or abandon an investment opportunity, any of which could have a negative effect on the Fund’s performance. These effects may be exacerbated during times of financial or political stress.

Leverage Risk. Certain Fund transactions may give rise to leverage. Leverage can result from a non-cash exposure to an underlying reference instrument. Leverage can increase both the risk and return potential of the Fund. The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage. The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements. Leverage may cause the Fund’s share price to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities. The loss on leveraged investments may substantially exceed the initial investment.

Short Sale Risk. The Fund will incur a loss as a result of a short sale if the price of the security sold short increases in value between the date of the short sale and the date on which the Fund purchases the security to replace the borrowed security. Short sale risks include, among others, the potential loss of more money than the actual cost of the investment, and the risk that the third party to the short sale may fail to honor its contract terms, causing a loss to the Fund.

Risks Associated with Active and Quantitative Management. The success of the Fund’s investment strategy depends on portfolio management’s successful application of analytical skills and investment judgment. Active management involves subjective decisions. The portfolio managers also use quantitative investment techniques and analyses in making investment decisions for the Fund. There can be no assurance that these techniques will achieve the desired results.

Securities Lending Risk. Securities lending involves a possible delay in recovery of the loaned securities or a possible loss of rights in the collateral if the borrower fails financially. The Fund could also lose money if the value of the collateral decreases.

General Fund Investing Risks. The Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective. It is possible to lose money by investing in the Fund. The Fund is designed to be a long-term investment vehicle and is not suited for short-term trading. Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. Purchase and redemption activities by Fund shareholders may impact the management of the Fund and its ability to achieve its investment objective(s). In addition, the redemption by one or more large shareholders or groups of shareholders of their holdings in the Fund could have an adverse impact on the remaining shareholders in the Fund. The Fund relies on various service providers, including the investment adviser, in its operations and is susceptible to operational, information security and related events (such as public health crises, cyber or hacking attacks) that may affect the service providers or the services that they provide to the Fund. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of a broad-based securities market index. The returns in the bar chart are for Class A shares and do not reflect a sales charge. If the sales charge was reflected, the returns would be lower. Past performance (both before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Updated Fund performance information can be obtained by visiting www.eatonvance.com.

For the ten years ended December 31, 2020, the highest quarterly total return for Class A was 15.16% for the quarter ended June 30, 2020, and the lowest quarterly return was -15.70% for the quarter ended March 31, 2020. The year-to-date total return through the end of the most recent calendar quarter (December 31, 2020 to September 30, 2021) was 9.93%.

Eaton Vance Richard Bernstein Equity Strategy Fund 5 Summary Prospectus dated January 1, 2022 as revised April 29, 2022

Average Annual Total Return as of December 31, 2020	One Year	Five Years	Ten Years
Class A Return Before Taxes	10.07%	9.97%	8.39%
Class A Return After Taxes on Distributions	9.54%	8.82%	7.70%
Class A Return After Taxes on Distributions and Sale of Class A Shares	6.51%	7.97%	6.93%
Class C Return Before Taxes	14.27%	10.32%	8.16%
Class I Return Before Taxes	16.48%	11.43%	9.24%
MSCI ACWI Index  (reflects net dividends, which reflect the deduction of withholding taxes)	16.25%	12.25%	9.12%

These returns reflect a reduction to the Class A front-end sales charge effective April 29, 2022 and any applicable contingent deferred sales charge (“CDSC”) for Class C. The Fund commenced operations on October 12, 2010. (Source for MSCI ACWI Index: MSCI) MSCI data may not be reproduced or used for any other purpose. MSCI provides no warranties, has not prepared or approved this data, and has no liability hereunder. Investors cannot invest directly in an Index.

After-tax returns are calculated using the highest historical individual federal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown. After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities. After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares. Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return Before Taxes and/or Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Management

Investment Adviser. Eaton Vance Management (“Eaton Vance”).

Investment Sub-Adviser. Richard Bernstein Advisors LLC (“RBA”).

Portfolio Managers

Richard Bernstein, Chief Executive Officer and Chief Investment Officer at RBA, has managed the Fund since its inception in October 2010.

Matthew Griswold, CFA, Director of Investments at RBA, has managed the Fund since January 2017.

Dan Suzuki, CFA, Deputy Chief Investment Officer at RBA, has managed the Fund since May 2021.

Henry Timmons, CFA, Director of ETFs at RBA, has managed the Fund since January 2017.

Purchase and Sale of Fund Shares

You may purchase, redeem or exchange Fund shares on any business day, which is any day the New York Stock Exchange is open for business. You may purchase, redeem or exchange Fund shares either through your financial intermediary or (except for purchases of Class C shares by accounts with no specified financial intermediary) directly from the Fund either by writing to the Fund, P.O. Box 9653, Providence, RI 02940-9653, or by calling 1-800-262-1122. The minimum initial purchase or exchange into the Fund is $1,000 for each Class (with the exception of Class I) and $1,000,000 for Class I (waived in certain circumstances). There is no minimum for subsequent investments.

Tax Information

If your shares are held in a taxable account, the Fund’s distributions will be taxed to you as ordinary income and/or capital gains, unless you are exempt from taxation. If your shares are held in a tax-advantaged account, you will generally be taxed only upon withdrawals from the account. 

Payments to Broker-Dealers and Other Financial Intermediaries

If you purchase the Fund’s shares through a broker-dealer or other financial intermediary (such as a bank) (collectively, “financial intermediaries”), the Fund, its principal underwriter and its affiliates may pay the financial intermediary for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing the financial intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary’s website for more information.

4821 4.29.22 © 2022 Eaton Vance Management

Eaton Vance Richard Bernstein Equity Strategy Fund 6 Summary Prospectus dated January 1, 2022 as revised April 29, 2022