Investment Risks

Sep. 19, 2025

Eventide Large Cap Growth ETF

Prospectus [Line Items]

Risk [Text Block]

As with any ETF, there is no guarantee that the Fund will achieve its objective. Investment markets are unpredictable and there will be certain market conditions where the Fund will not meet its investment objective and will lose money. The Fund’s net asset value (“NAV”), market price and returns will vary, and you could lose money on your investment in the Fund and those losses could be significant. 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 government agency.

The following identifies the principal risks of investing in the Fund. These risks could adversely affect the NAV, market price, total return and the value of the Fund and your investment.

Authorized Participant Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants. An “Authorized Participant” is a participant in the Continuous Net Settlement System of the National Securities Clearing Corporation or the Depository Trust Company (“DTC”) and that has executed a Participant Agreement with the Fund’s distributor (“Distributor”). To the extent these Authorized Participants exit the business or are unable to process creation and/or redemption orders and no other Authorized Participant is able to step forward to process creation and/or redemption orders, in either of these cases, shares of the Fund may trade like closed-end fund shares at a discount to the Fund’s NAV per share and possibly face delisting by NYSE Arca, Inc. (the “Exchange”). These risks could cause intra-day bid/ask spreads for the Fund’s shares to widen.

Equity Securities Risk. The NAV and market price of the Fund will fluctuate based on changes in the value of the equity securities held by the Fund. Equity prices can fall rapidly in response to developments affecting a specific company or industry, or to changing economic, political or market conditions.

Ethical Investment Risk. The Fund’s ethical values screening criteria could cause it to underperform similar funds that do not have such screening criteria. This could be due to ethically acceptable companies falling out of favor with investors or failing to perform as well as companies that do not meet the Fund’s ethical screening guidelines.

To supplement its efforts in ethical investing, the Adviser may engage with portfolio companies to encourage consideration of corporate strategies aligned with the Adviser’s values, including pricing and/or business practices that may be beneficial within particular industries. The Adviser believes these activities will help promote ethical and effective corporate governance and long-term strategy for companies, and potentially create a positive effect on the particular businesses and/or industries, their consumers, and the Fund. There is no guarantee that the Adviser’s corporate engagements and related activities will achieve their intended results. There is a risk that the Adviser’s activities in this regard could limit the Fund’s investment universe and reduce the amount of profits that could be realized by affected companies, limiting the Fund’s investment returns. Furthermore, the U.S. government or any agency thereof, may enact rules or legislation that, directly or indirectly, materially impacts the Adviser’s activities in this regard, or materially affects the value of companies or opportunities for investment within particular industries.

ETF Structure Risks. The Fund, and any ETFs the Fund may invest in, are structured as ETFs and as a result are subject to special risks, including:

■ Not Individually Redeemable. Shares are not individually redeemable and may be redeemed by the Fund at NAV only in large blocks known as “Creation Units.” Fund shares are typically bought and sold in the secondary market and investors typically pay brokerage commissions or other charges on these transactions.

■ Trading Issues. Trading in shares on the Exchange may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in shares inadvisable, such as extraordinary market volatility. There can be no assurance that Shares will continue to meet the listing requirements of the Exchange. An active trading market for the Fund’s shares may not be developed or maintained. If the Fund’s shares are traded outside a collateralized settlement system, the number of financial institutions that can act as authorized participants that can post collateral on an agency basis is limited, which may limit the market for the Fund’s shares.

■ Market Price Variance Risk. The market prices of shares will fluctuate in response to changes in NAV and supply and demand for shares and will include a “bid-ask spread” charged by the exchange specialists, market makers or other participants that trade the particular security. There may be times when the market price and the NAV vary significantly. This means that Shares may trade at a discount to NAV and intra-day bid/ask spreads may widen.

■ In times of market stress, market makers may step away from their role market making in shares of ETFs and in executing trades, which can lead to differences between the market value of Fund shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

■ The market price for the Fund’s shares may deviate from the Fund’s NAV, particularly during times of market stress, with the result that investors may pay significantly more or significantly less for Fund shares than the Fund’s NAV, which is reflected in the bid and ask price for Fund shares or in the closing price.

■ When all or a portion of an ETF’s underlying securities trade in a market that is closed when the market for the Fund’s shares is open, there may be changes from the last quote of the closed market and the quote from the Fund’s domestic trading day, which could lead to differences between the market value of the Fund’s shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

■ In stressed market conditions, the market for the Fund’s shares may become less liquid in response to the deteriorating liquidity of the Fund’s portfolio. This adverse effect on the liquidity of the Fund’s shares may, in turn, lead to differences between the market value of the Fund’s shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

Growth Stock Risk. “Growth” stocks can react differently to issuer, political, market, and economic developments than the market as a whole and other types of stocks. “Growth” stocks also tend to be more expensive relative to their earnings or assets compared to other types of stocks. As a result, “growth” stocks tend to be sensitive to changes in their earnings and more volatile in price than the stock market as a whole. In addition, companies that the Adviser believes have significant growth potential are often companies with new, limited or cyclical product lines, markets or financial resources and the management of such companies may be dependent upon one or a few key people. The stocks of such companies can therefore be subject to more abrupt or erratic market movements than stocks of larger, more established companies or the stock market in general.

Industry Concentration Risk. The Fund may concentrate 25% to 35% of its total assets in a particular industry or group of industries to the extent that such industry or group of industries represents 20% or more of the Fund’s Strategy Benchmark. A fund that concentrates its investments in an industry or group of industries is more vulnerable to adverse market, economic, regulatory, political or other developments affecting such industry or group of industries than a fund that invests its assets more broadly.

Investment Style Risk. The type of securities in which the Fund focuses may underperform other assets or the overall market.

Issuer Specific Risk. The performance of the Fund depends on the performance of the issuers of the individual securities in which the Fund invests. Poor performance by any issuer may cause the value of its securities, and the value of the Fund’s Shares, to decline. The value of a specific security can be more volatile than the market as a whole and can perform differently from the value of the market as a whole. The value of securities of smaller issuers can be more volatile than those of larger issuers. The value of certain types of securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments. Market prices of securities in broad market segments may be adversely affected by a prominent issuer having experienced losses, lack of earnings, failure to meet the market’s expectations with respect to new products or services, or even by factors wholly unrelated to the value or condition of the issuer, such as changes in interest rates.

Large Capitalization Company Risk. The Fund’s investment in larger companies is subject to the risk that larger companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion; and may be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes.

Limited History of Operations Risk. The Fund has a limited history of operations for investors to evaluate.

Management Risk. The Adviser’s reliance on its sector allocation and risk management strategies and related judgments about the value and potential appreciation of securities in which the Fund invests may prove to be incorrect. The Adviser may not successfully implement the Fund’s investment strategies and, as a result, the Fund may not meet its investment objective and/or underperform other investment vehicles with similar investment objectives and strategies.

Market Risk. The value of securities in the Fund’s portfolio will fluctuate and, as a result, the Fund’s NAV or market price per share may decline suddenly or over a sustained period of time. Factors such as domestic and foreign economic growth rates and market conditions, interest rate levels, trading and tariff events and political events may adversely affect the securities markets.

Medium (Mid) Capitalization Company Risk. To the extent the Fund invests in the stocks of mid-sized companies, the Fund may be subject to additional risks. The earnings and prospects of these companies are more volatile than larger companies. These companies may experience higher failure rates than larger companies. Mid-sized companies normally have a lower trading volume than larger companies, which may tend to make their market price fall more disproportionately than larger companies in response to selling pressures. Mid-sized companies may also have limited markets, product lines or financial resources and may lack management experience.

Real Estate Risk. The Fund is subject to the risks of the real estate market as a whole, such as taxation, regulations and economic and political factors that negatively impact the real estate market and the direct ownership of real estate. These may include decreases in real estate values, overbuilding, rising operating costs, interest rates and property taxes. In addition, some real estate related investments are not fully diversified and are subject to the risks associated with financing a limited number of projects.

REIT Risk. The Fund’s investments in REITs are subject to the same risks as direct investments in real estate, including sensitivity to general economic downturns and the volatility of local real estate markets. REITs may have limited financial resources and their securities may trade infrequently and in limited volume, and thus they may be more volatile than other securities. The liquidity of REITs may change dramatically over time.

Regulatory Risk. Regulatory authorities in the United States or other countries may adopt rules that restrict the ability of the Fund to fully implement its strategy, either generally, or with respect to certain securities, industries or countries, which may impact the Fund’s ability to fully implement its investment strategies. Policy changes by the U.S. government or its regulatory agencies and political events within the U.S. and abroad may, among other things, affect investor and consumer confidence and increase volatility in the financial markets, perhaps suddenly and to a significant degree, which may adversely impact the Fund’s operations, universe of potential investment options, and return potential. Regulators may interpret rules differently than the Fund or the securities industry generally, and disputes over such interpretations can increase legal and/or tax expenses incurred by the Fund.

Small Capitalization Company Risk. To the extent the Fund invests in the stocks of smaller-sized companies, the Fund may be subject to additional risks. The earnings and prospects of these companies are more volatile than larger companies. Smaller-sized companies may experience higher failure rates than do larger companies. The trading volume of securities of smaller-sized companies is normally less than that of larger companies and, therefore, may disproportionately affect their market price, tending to make them fall more in response to selling pressure than is the case with larger companies. Smaller-sized companies may have limited markets, product lines or financial resources and may lack management experience.

For more information, please see the section of the Fund’s Prospectus entitled “Additional Information About the Fund’s Principal Investment Strategies and Related Risks.” 

Eventide Large Cap Growth ETF | Authorized Participant Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Authorized Participant Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants. An “Authorized Participant” is a participant in the Continuous Net Settlement System of the National Securities Clearing Corporation or the Depository Trust Company (“DTC”) and that has executed a Participant Agreement with the Fund’s distributor (“Distributor”). To the extent these Authorized Participants exit the business or are unable to process creation and/or redemption orders and no other Authorized Participant is able to step forward to process creation and/or redemption orders, in either of these cases, shares of the Fund may trade like closed-end fund shares at a discount to the Fund’s NAV per share and possibly face delisting by NYSE Arca, Inc. (the “Exchange”). These risks could cause intra-day bid/ask spreads for the Fund’s shares to widen.

Eventide Large Cap Growth ETF | Equity Securities Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Equity Securities Risk. The NAV and market price of the Fund will fluctuate based on changes in the value of the equity securities held by the Fund. Equity prices can fall rapidly in response to developments affecting a specific company or industry, or to changing economic, political or market conditions.

Eventide Large Cap Growth ETF | Ethical Investment Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Ethical Investment Risk. The Fund’s ethical values screening criteria could cause it to underperform similar funds that do not have such screening criteria. This could be due to ethically acceptable companies falling out of favor with investors or failing to perform as well as companies that do not meet the Fund’s ethical screening guidelines.

To supplement its efforts in ethical investing, the Adviser may engage with portfolio companies to encourage consideration of corporate strategies aligned with the Adviser’s values, including pricing and/or business practices that may be beneficial within particular industries. The Adviser believes these activities will help promote ethical and effective corporate governance and long-term strategy for companies, and potentially create a positive effect on the particular businesses and/or industries, their consumers, and the Fund. There is no guarantee that the Adviser’s corporate engagements and related activities will achieve their intended results. There is a risk that the Adviser’s activities in this regard could limit the Fund’s investment universe and reduce the amount of profits that could be realized by affected companies, limiting the Fund’s investment returns. Furthermore, the U.S. government or any agency thereof, may enact rules or legislation that, directly or indirectly, materially impacts the Adviser’s activities in this regard, or materially affects the value of companies or opportunities for investment within particular industries.

Eventide Large Cap Growth ETF | ETF Structure Risks [Member]

Prospectus [Line Items]

Risk [Text Block]

ETF Structure Risks. The Fund, and any ETFs the Fund may invest in, are structured as ETFs and as a result are subject to special risks, including:

■ Not Individually Redeemable. Shares are not individually redeemable and may be redeemed by the Fund at NAV only in large blocks known as “Creation Units.” Fund shares are typically bought and sold in the secondary market and investors typically pay brokerage commissions or other charges on these transactions.

■ Trading Issues. Trading in shares on the Exchange may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in shares inadvisable, such as extraordinary market volatility. There can be no assurance that Shares will continue to meet the listing requirements of the Exchange. An active trading market for the Fund’s shares may not be developed or maintained. If the Fund’s shares are traded outside a collateralized settlement system, the number of financial institutions that can act as authorized participants that can post collateral on an agency basis is limited, which may limit the market for the Fund’s shares.

■ Market Price Variance Risk. The market prices of shares will fluctuate in response to changes in NAV and supply and demand for shares and will include a “bid-ask spread” charged by the exchange specialists, market makers or other participants that trade the particular security. There may be times when the market price and the NAV vary significantly. This means that Shares may trade at a discount to NAV and intra-day bid/ask spreads may widen.

■ In times of market stress, market makers may step away from their role market making in shares of ETFs and in executing trades, which can lead to differences between the market value of Fund shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

■ The market price for the Fund’s shares may deviate from the Fund’s NAV, particularly during times of market stress, with the result that investors may pay significantly more or significantly less for Fund shares than the Fund’s NAV, which is reflected in the bid and ask price for Fund shares or in the closing price.

■ When all or a portion of an ETF’s underlying securities trade in a market that is closed when the market for the Fund’s shares is open, there may be changes from the last quote of the closed market and the quote from the Fund’s domestic trading day, which could lead to differences between the market value of the Fund’s shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

■ In stressed market conditions, the market for the Fund’s shares may become less liquid in response to the deteriorating liquidity of the Fund’s portfolio. This adverse effect on the liquidity of the Fund’s shares may, in turn, lead to differences between the market value of the Fund’s shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

Eventide Large Cap Growth ETF | Not Individually Redeemable [Member]

Prospectus [Line Items]

Risk [Text Block]

■ Not Individually Redeemable. Shares are not individually redeemable and may be redeemed by the Fund at NAV only in large blocks known as “Creation Units.” Fund shares are typically bought and sold in the secondary market and investors typically pay brokerage commissions or other charges on these transactions.

Eventide Large Cap Growth ETF | Trading Issues [Member]

Prospectus [Line Items]

Risk [Text Block]

■ Trading Issues. Trading in shares on the Exchange may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in shares inadvisable, such as extraordinary market volatility. There can be no assurance that Shares will continue to meet the listing requirements of the Exchange. An active trading market for the Fund’s shares may not be developed or maintained. If the Fund’s shares are traded outside a collateralized settlement system, the number of financial institutions that can act as authorized participants that can post collateral on an agency basis is limited, which may limit the market for the Fund’s shares.

Eventide Large Cap Growth ETF | Market Price Variance Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

■ Market Price Variance Risk. The market prices of shares will fluctuate in response to changes in NAV and supply and demand for shares and will include a “bid-ask spread” charged by the exchange specialists, market makers or other participants that trade the particular security. There may be times when the market price and the NAV vary significantly. This means that Shares may trade at a discount to NAV and intra-day bid/ask spreads may widen.

■ In times of market stress, market makers may step away from their role market making in shares of ETFs and in executing trades, which can lead to differences between the market value of Fund shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

■ The market price for the Fund’s shares may deviate from the Fund’s NAV, particularly during times of market stress, with the result that investors may pay significantly more or significantly less for Fund shares than the Fund’s NAV, which is reflected in the bid and ask price for Fund shares or in the closing price.

■ When all or a portion of an ETF’s underlying securities trade in a market that is closed when the market for the Fund’s shares is open, there may be changes from the last quote of the closed market and the quote from the Fund’s domestic trading day, which could lead to differences between the market value of the Fund’s shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

■ In stressed market conditions, the market for the Fund’s shares may become less liquid in response to the deteriorating liquidity of the Fund’s portfolio. This adverse effect on the liquidity of the Fund’s shares may, in turn, lead to differences between the market value of the Fund’s shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

Eventide Large Cap Growth ETF | Growth Stock Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Growth Stock Risk. “Growth” stocks can react differently to issuer, political, market, and economic developments than the market as a whole and other types of stocks. “Growth” stocks also tend to be more expensive relative to their earnings or assets compared to other types of stocks. As a result, “growth” stocks tend to be sensitive to changes in their earnings and more volatile in price than the stock market as a whole. In addition, companies that the Adviser believes have significant growth potential are often companies with new, limited or cyclical product lines, markets or financial resources and the management of such companies may be dependent upon one or a few key people. The stocks of such companies can therefore be subject to more abrupt or erratic market movements than stocks of larger, more established companies or the stock market in general.

Eventide Large Cap Growth ETF | Industry Concentration Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Industry Concentration Risk. The Fund may concentrate 25% to 35% of its total assets in a particular industry or group of industries to the extent that such industry or group of industries represents 20% or more of the Fund’s Strategy Benchmark. A fund that concentrates its investments in an industry or group of industries is more vulnerable to adverse market, economic, regulatory, political or other developments affecting such industry or group of industries than a fund that invests its assets more broadly.

Eventide Large Cap Growth ETF | Investment Style Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Investment Style Risk. The type of securities in which the Fund focuses may underperform other assets or the overall market.

Eventide Large Cap Growth ETF | Issuer Specific Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Issuer Specific Risk. The performance of the Fund depends on the performance of the issuers of the individual securities in which the Fund invests. Poor performance by any issuer may cause the value of its securities, and the value of the Fund’s Shares, to decline. The value of a specific security can be more volatile than the market as a whole and can perform differently from the value of the market as a whole. The value of securities of smaller issuers can be more volatile than those of larger issuers. The value of certain types of securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments. Market prices of securities in broad market segments may be adversely affected by a prominent issuer having experienced losses, lack of earnings, failure to meet the market’s expectations with respect to new products or services, or even by factors wholly unrelated to the value or condition of the issuer, such as changes in interest rates.

Eventide Large Cap Growth ETF | Large Capitalization Company Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Large Capitalization Company Risk. The Fund’s investment in larger companies is subject to the risk that larger companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion; and may be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes.

Eventide Large Cap Growth ETF | Limited History of Operations Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Limited History of Operations Risk. The Fund has a limited history of operations for investors to evaluate.

Eventide Large Cap Growth ETF | Management Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Management Risk. The Adviser’s reliance on its sector allocation and risk management strategies and related judgments about the value and potential appreciation of securities in which the Fund invests may prove to be incorrect. The Adviser may not successfully implement the Fund’s investment strategies and, as a result, the Fund may not meet its investment objective and/or underperform other investment vehicles with similar investment objectives and strategies.

Eventide Large Cap Growth ETF | Market Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Market Risk. The value of securities in the Fund’s portfolio will fluctuate and, as a result, the Fund’s NAV or market price per share may decline suddenly or over a sustained period of time. Factors such as domestic and foreign economic growth rates and market conditions, interest rate levels, trading and tariff events and political events may adversely affect the securities markets.

Eventide Large Cap Growth ETF | Medium (Mid) Capitalization Company Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Medium (Mid) Capitalization Company Risk. To the extent the Fund invests in the stocks of mid-sized companies, the Fund may be subject to additional risks. The earnings and prospects of these companies are more volatile than larger companies. These companies may experience higher failure rates than larger companies. Mid-sized companies normally have a lower trading volume than larger companies, which may tend to make their market price fall more disproportionately than larger companies in response to selling pressures. Mid-sized companies may also have limited markets, product lines or financial resources and may lack management experience.

Eventide Large Cap Growth ETF | Real Estate Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Real Estate Risk. The Fund is subject to the risks of the real estate market as a whole, such as taxation, regulations and economic and political factors that negatively impact the real estate market and the direct ownership of real estate. These may include decreases in real estate values, overbuilding, rising operating costs, interest rates and property taxes. In addition, some real estate related investments are not fully diversified and are subject to the risks associated with financing a limited number of projects.

Eventide Large Cap Growth ETF | REIT Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

REIT Risk. The Fund’s investments in REITs are subject to the same risks as direct investments in real estate, including sensitivity to general economic downturns and the volatility of local real estate markets. REITs may have limited financial resources and their securities may trade infrequently and in limited volume, and thus they may be more volatile than other securities. The liquidity of REITs may change dramatically over time.

Eventide Large Cap Growth ETF | Regulatory Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Regulatory Risk. Regulatory authorities in the United States or other countries may adopt rules that restrict the ability of the Fund to fully implement its strategy, either generally, or with respect to certain securities, industries or countries, which may impact the Fund’s ability to fully implement its investment strategies. Policy changes by the U.S. government or its regulatory agencies and political events within the U.S. and abroad may, among other things, affect investor and consumer confidence and increase volatility in the financial markets, perhaps suddenly and to a significant degree, which may adversely impact the Fund’s operations, universe of potential investment options, and return potential. Regulators may interpret rules differently than the Fund or the securities industry generally, and disputes over such interpretations can increase legal and/or tax expenses incurred by the Fund.

Eventide Large Cap Growth ETF | Small Capitalization Company Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Small Capitalization Company Risk. To the extent the Fund invests in the stocks of smaller-sized companies, the Fund may be subject to additional risks. The earnings and prospects of these companies are more volatile than larger companies. Smaller-sized companies may experience higher failure rates than do larger companies. The trading volume of securities of smaller-sized companies is normally less than that of larger companies and, therefore, may disproportionately affect their market price, tending to make them fall more in response to selling pressure than is the case with larger companies. Smaller-sized companies may have limited markets, product lines or financial resources and may lack management experience.

Eventide Large Cap Value ETF

Prospectus [Line Items]

Risk [Text Block]

As with any ETF, there is no guarantee that the Fund will achieve its objective. Investment markets are unpredictable and there will be certain market conditions where the Fund will not meet its investment objective and will lose money. The Fund’s net asset value (“NAV”), market price and returns will vary, and you could lose money on your investment in the Fund and those losses could be significant. 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 government agency.

The following identifies the principal risks of investing in the Fund. These risks could adversely affect the NAV, market price, total return and the value of the Fund and your investment.

Authorized Participant Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants. An “Authorized Participant” is a participant in the Continuous Net Settlement System of the National Securities Clearing Corporation or the Depository Trust Company (“DTC”) and that has executed a Participant Agreement with the Fund’s distributor (“Distributor”). To the extent these Authorized Participants exit the business or are unable to process creation and/or redemption orders and no other Authorized Participant is able to step forward to process creation and/or redemption orders, in either of these cases, shares of the Fund may trade like closed-end fund shares at a discount to the Fund’s NAV per share and possibly face delisting by NYSE Arca, Inc. (the “Exchange”). These risks could cause intra-day bid/ask spreads for the Fund’s shares to widen.

Equity Securities Risk. The NAV and market price of the Fund will fluctuate based on changes in the value of the equity securities held by the Fund. Equity prices can fall rapidly in response to developments affecting a specific company or industry, or to changing economic, political or market conditions.

Ethical Investment Risk. The Fund’s ethical values screening criteria could cause it to underperform similar funds that do not have such screening criteria. This could be due to ethically acceptable companies falling out of favor with investors or failing to perform as well as companies that do not meet the Fund’s ethical screening guidelines.

To supplement its efforts in ethical investing, the Adviser may engage with portfolio companies to encourage consideration of corporate strategies aligned with the Adviser’s values, including pricing and/or business practices that may be beneficial within particular industries. The Adviser believes these activities will help promote ethical and effective corporate governance and long-term strategy for companies, and potentially create a positive effect on the particular businesses and/or industries, their consumers, and the Fund. There is no guarantee that the Adviser’s corporate engagements and related activities will achieve their intended results. There is a risk that the Adviser’s activities in this regard could limit the Fund’s investment universe and reduce the amount of profits that could be realized by affected companies, limiting the Fund’s investment returns. Furthermore, the U.S. government or any agency thereof, may enact rules or legislation that, directly or indirectly, materially impacts the Adviser’s activities in this regard, or materially affects the value of companies or opportunities for investment within particular industries.

ETF Structure Risks. The Fund, and any ETFs the Fund may invest in, are structured as ETFs and as a result are subject to special risks, including:

■ Not Individually Redeemable. Shares are not individually redeemable and may be redeemed by the Fund at NAV only in large blocks known as “Creation Units.” Fund shares are typically bought and sold in the secondary market and investors typically pay brokerage commissions or other charges on these transactions.

■ Trading Issues. Trading in shares on the Exchange may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in shares inadvisable, such as extraordinary market volatility. There can be no assurance that Shares will continue to meet the listing requirements of the Exchange. An active trading market for the Fund’s shares may not be developed or maintained. If the Fund’s shares are traded outside a collateralized settlement system, the number of financial institutions that can act as authorized participants that can post collateral on an agency basis is limited, which may limit the market for the Fund’s shares.

■ Market Price Variance Risk. The market prices of shares will fluctuate in response to changes in NAV and supply and demand for shares and will include a “bid-ask spread” charged by the exchange specialists, market makers or other participants that trade the particular security. There may be times when the market price and the NAV vary significantly. This means that Shares may trade at a discount to NAV and intra-day bid/ask spreads may widen.

■ In times of market stress, market makers may step away from their role market making in shares of ETFs and in executing trades, which can lead to differences between the market value of Fund shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

■ The market price for the Fund’s shares may deviate from the Fund’s NAV, particularly during times of market stress, with the result that investors may pay significantly more or significantly less for Fund shares than the Fund’s NAV, which is reflected in the bid and ask price for Fund shares or in the closing price.

■ When all or a portion of an ETF’s underlying securities trade in a market that is closed when the market for the Fund’s shares is open, there may be changes from the last quote of the closed market and the quote from the Fund’s domestic trading day, which could lead to differences between the market value of the Fund’s shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

■ In stressed market conditions, the market for the Fund’s shares may become less liquid in response to the deteriorating liquidity of the Fund’s portfolio. This adverse effect on the liquidity of the Fund’s shares may, in turn, lead to differences between the market value of the Fund’s shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

Industry Concentration Risk. The Fund may concentrate 25% to 35% of its total assets in a particular industry or group of industries to the extent that such industry or group of industries represents 20% or more of the Fund’s Strategy Benchmark. A fund that concentrates its investments in an industry or group of industries is more vulnerable to adverse market, economic, regulatory, political or other developments affecting such industry or group of industries than a fund that invests its assets more broadly.

Investment Style Risk. The type of securities in which the Fund focuses may underperform other assets or the overall market.

Issuer Specific Risk. The performance of the Fund depends on the performance of the issuers of the individual securities in which the Fund invests. Poor performance by any issuer may cause the value of its securities, and the value of the Fund’s Shares, to decline. The value of a specific security can be more volatile than the market as a whole and can perform differently from the value of the market as a whole. The value of securities of smaller issuers can be more volatile than those of larger issuers. The value of certain types of securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments. Market prices of securities in broad market segments may be adversely affected by a prominent issuer having experienced losses, lack of earnings, failure to meet the market’s expectations with respect to new products or services, or even by factors wholly unrelated to the value or condition of the issuer, such as changes in interest rates.

Large Capitalization Company Risk. The Fund’s investment in larger companies is subject to the risk that larger companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion; and may be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes.

Limited History of Operations Risk. The Fund has a limited history of operations for investors to evaluate.

Management Risk. The Adviser’s reliance on its sector allocation and risk management strategies and related judgments about the value and potential appreciation of securities in which the Fund invests may prove to be incorrect. The Adviser may not successfully implement the Fund’s investment strategies and, as a result, the Fund may not meet its investment objective and/or underperform other investment vehicles with similar investment objectives and strategies.

Market Risk. The value of securities in the Fund’s portfolio will fluctuate and, as a result, the Fund’s NAV or market price per share may decline suddenly or over a sustained period of time. Factors such as domestic and foreign economic growth rates and market conditions, interest rate levels, trading and tariff events and political events may adversely affect the securities markets.

Medium (Mid) Capitalization Company Risk. To the extent the Fund invests in the stocks of mid-sized companies, the Fund may be subject to additional risks. The earnings and prospects of these companies are more volatile than larger companies. These companies may experience higher failure rates than larger companies. Mid- sized companies normally have a lower trading volume than larger companies, which may tend to make their market price fall more disproportionately than larger companies in response to selling pressures. Mid-sized companies may also have limited markets, product lines or financial resources and may lack management experience.

Real Estate Risk. The Fund is subject to the risks of the real estate market as a whole, such as taxation, regulations and economic and political factors that negatively impact the real estate market and the direct ownership of real estate. These may include decreases in real estate values, overbuilding, rising operating costs, interest rates and property taxes. In addition, some real estate related investments are not fully diversified and are subject to the risks associated with financing a limited number of projects.

REIT Risk. The Fund’s investments in REITs are subject to the same risks as direct investments in real estate, including sensitivity to general economic downturns and the volatility of local real estate markets. REITs may have limited financial resources and their securities may trade infrequently and in limited volume, and thus they may be more volatile than other securities. The liquidity of REITs may change dramatically over time.

Regulatory Risk. Regulatory authorities in the United States or other countries may adopt rules that restrict the ability of the Fund to fully implement its strategy, either generally, or with respect to certain securities, industries or countries, which may impact the Fund’s ability to fully implement its investment strategies. Policy changes by the U.S. government or its regulatory agencies and political events within the U.S. and abroad may, among other things, affect investor and consumer confidence and increase volatility in the financial markets, perhaps suddenly and to a significant degree, which may adversely impact the Fund’s operations, universe of potential investment options, and return potential. Regulators may interpret rules differently than the Fund or the securities industry generally, and disputes over such interpretations can increase legal and/or tax expenses incurred by the Fund.

Small Capitalization Company Risk. To the extent the Fund invests in the stocks of smaller-sized companies, the Fund may be subject to additional risks. The earnings and prospects of these companies are more volatile than larger companies. Smaller-sized companies may experience higher failure rates than do larger companies. The trading volume of securities of smaller-sized companies is normally less than that of larger companies and, therefore, may disproportionately affect their market price, tending to make them fall more in response to selling pressure than is the case with larger companies. Smaller-sized companies may have limited markets, product lines or financial resources and may lack management experience.

Value Investing Risk. A value style of investing focuses on undervalued companies with characteristics for improved valuations. “Value” securities are subject to the risk that their valuations never improve or that the returns on “value” securities are less than returns on other styles of investing or the overall stock market. Thus, the value of the Fund’s investments will vary and at times may be lower than that of other types of investments. Historically, value investments have performed best during periods of economic recovery. Therefore, the value investing style may over time go in and out of favor. Value stocks also may decline in price, even though in theory they are already underpriced.

For more information, please see the section of the Fund’s Prospectus entitled “Additional Information About the Fund’s Principal Investment Strategies and Related Risks.” 

Eventide Large Cap Value ETF | Authorized Participant Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Authorized Participant Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants. An “Authorized Participant” is a participant in the Continuous Net Settlement System of the National Securities Clearing Corporation or the Depository Trust Company (“DTC”) and that has executed a Participant Agreement with the Fund’s distributor (“Distributor”). To the extent these Authorized Participants exit the business or are unable to process creation and/or redemption orders and no other Authorized Participant is able to step forward to process creation and/or redemption orders, in either of these cases, shares of the Fund may trade like closed-end fund shares at a discount to the Fund’s NAV per share and possibly face delisting by NYSE Arca, Inc. (the “Exchange”). These risks could cause intra-day bid/ask spreads for the Fund’s shares to widen.

Eventide Large Cap Value ETF | Equity Securities Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Equity Securities Risk. The NAV and market price of the Fund will fluctuate based on changes in the value of the equity securities held by the Fund. Equity prices can fall rapidly in response to developments affecting a specific company or industry, or to changing economic, political or market conditions.

Eventide Large Cap Value ETF | Ethical Investment Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Ethical Investment Risk. The Fund’s ethical values screening criteria could cause it to underperform similar funds that do not have such screening criteria. This could be due to ethically acceptable companies falling out of favor with investors or failing to perform as well as companies that do not meet the Fund’s ethical screening guidelines.

To supplement its efforts in ethical investing, the Adviser may engage with portfolio companies to encourage consideration of corporate strategies aligned with the Adviser’s values, including pricing and/or business practices that may be beneficial within particular industries. The Adviser believes these activities will help promote ethical and effective corporate governance and long-term strategy for companies, and potentially create a positive effect on the particular businesses and/or industries, their consumers, and the Fund. There is no guarantee that the Adviser’s corporate engagements and related activities will achieve their intended results. There is a risk that the Adviser’s activities in this regard could limit the Fund’s investment universe and reduce the amount of profits that could be realized by affected companies, limiting the Fund’s investment returns. Furthermore, the U.S. government or any agency thereof, may enact rules or legislation that, directly or indirectly, materially impacts the Adviser’s activities in this regard, or materially affects the value of companies or opportunities for investment within particular industries.

Eventide Large Cap Value ETF | ETF Structure Risks [Member]

Prospectus [Line Items]

Risk [Text Block]

ETF Structure Risks. The Fund, and any ETFs the Fund may invest in, are structured as ETFs and as a result are subject to special risks, including:

■ Not Individually Redeemable. Shares are not individually redeemable and may be redeemed by the Fund at NAV only in large blocks known as “Creation Units.” Fund shares are typically bought and sold in the secondary market and investors typically pay brokerage commissions or other charges on these transactions.

■ Trading Issues. Trading in shares on the Exchange may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in shares inadvisable, such as extraordinary market volatility. There can be no assurance that Shares will continue to meet the listing requirements of the Exchange. An active trading market for the Fund’s shares may not be developed or maintained. If the Fund’s shares are traded outside a collateralized settlement system, the number of financial institutions that can act as authorized participants that can post collateral on an agency basis is limited, which may limit the market for the Fund’s shares.

■ Market Price Variance Risk. The market prices of shares will fluctuate in response to changes in NAV and supply and demand for shares and will include a “bid-ask spread” charged by the exchange specialists, market makers or other participants that trade the particular security. There may be times when the market price and the NAV vary significantly. This means that Shares may trade at a discount to NAV and intra-day bid/ask spreads may widen.

■ In times of market stress, market makers may step away from their role market making in shares of ETFs and in executing trades, which can lead to differences between the market value of Fund shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

■ The market price for the Fund’s shares may deviate from the Fund’s NAV, particularly during times of market stress, with the result that investors may pay significantly more or significantly less for Fund shares than the Fund’s NAV, which is reflected in the bid and ask price for Fund shares or in the closing price.

■ When all or a portion of an ETF’s underlying securities trade in a market that is closed when the market for the Fund’s shares is open, there may be changes from the last quote of the closed market and the quote from the Fund’s domestic trading day, which could lead to differences between the market value of the Fund’s shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

■ In stressed market conditions, the market for the Fund’s shares may become less liquid in response to the deteriorating liquidity of the Fund’s portfolio. This adverse effect on the liquidity of the Fund’s shares may, in turn, lead to differences between the market value of the Fund’s shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

Eventide Large Cap Value ETF | Not Individually Redeemable [Member]

Prospectus [Line Items]

Risk [Text Block]

■ Not Individually Redeemable. Shares are not individually redeemable and may be redeemed by the Fund at NAV only in large blocks known as “Creation Units.” Fund shares are typically bought and sold in the secondary market and investors typically pay brokerage commissions or other charges on these transactions.

Eventide Large Cap Value ETF | Trading Issues [Member]

Prospectus [Line Items]

Risk [Text Block]

■ Trading Issues. Trading in shares on the Exchange may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in shares inadvisable, such as extraordinary market volatility. There can be no assurance that Shares will continue to meet the listing requirements of the Exchange. An active trading market for the Fund’s shares may not be developed or maintained. If the Fund’s shares are traded outside a collateralized settlement system, the number of financial institutions that can act as authorized participants that can post collateral on an agency basis is limited, which may limit the market for the Fund’s shares.

Eventide Large Cap Value ETF | Market Price Variance Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

■ Market Price Variance Risk. The market prices of shares will fluctuate in response to changes in NAV and supply and demand for shares and will include a “bid-ask spread” charged by the exchange specialists, market makers or other participants that trade the particular security. There may be times when the market price and the NAV vary significantly. This means that Shares may trade at a discount to NAV and intra-day bid/ask spreads may widen.

■ In times of market stress, market makers may step away from their role market making in shares of ETFs and in executing trades, which can lead to differences between the market value of Fund shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

■ The market price for the Fund’s shares may deviate from the Fund’s NAV, particularly during times of market stress, with the result that investors may pay significantly more or significantly less for Fund shares than the Fund’s NAV, which is reflected in the bid and ask price for Fund shares or in the closing price.

■ When all or a portion of an ETF’s underlying securities trade in a market that is closed when the market for the Fund’s shares is open, there may be changes from the last quote of the closed market and the quote from the Fund’s domestic trading day, which could lead to differences between the market value of the Fund’s shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

■ In stressed market conditions, the market for the Fund’s shares may become less liquid in response to the deteriorating liquidity of the Fund’s portfolio. This adverse effect on the liquidity of the Fund’s shares may, in turn, lead to differences between the market value of the Fund’s shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

Eventide Large Cap Value ETF | Industry Concentration Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Industry Concentration Risk. The Fund may concentrate 25% to 35% of its total assets in a particular industry or group of industries to the extent that such industry or group of industries represents 20% or more of the Fund’s Strategy Benchmark. A fund that concentrates its investments in an industry or group of industries is more vulnerable to adverse market, economic, regulatory, political or other developments affecting such industry or group of industries than a fund that invests its assets more broadly.

Eventide Large Cap Value ETF | Investment Style Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Investment Style Risk. The type of securities in which the Fund focuses may underperform other assets or the overall market.

Eventide Large Cap Value ETF | Issuer Specific Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Issuer Specific Risk. The performance of the Fund depends on the performance of the issuers of the individual securities in which the Fund invests. Poor performance by any issuer may cause the value of its securities, and the value of the Fund’s Shares, to decline. The value of a specific security can be more volatile than the market as a whole and can perform differently from the value of the market as a whole. The value of securities of smaller issuers can be more volatile than those of larger issuers. The value of certain types of securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments. Market prices of securities in broad market segments may be adversely affected by a prominent issuer having experienced losses, lack of earnings, failure to meet the market’s expectations with respect to new products or services, or even by factors wholly unrelated to the value or condition of the issuer, such as changes in interest rates.

Eventide Large Cap Value ETF | Large Capitalization Company Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Large Capitalization Company Risk. The Fund’s investment in larger companies is subject to the risk that larger companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion; and may be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes.

Eventide Large Cap Value ETF | Limited History of Operations Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Limited History of Operations Risk. The Fund has a limited history of operations for investors to evaluate.

Eventide Large Cap Value ETF | Management Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Management Risk. The Adviser’s reliance on its sector allocation and risk management strategies and related judgments about the value and potential appreciation of securities in which the Fund invests may prove to be incorrect. The Adviser may not successfully implement the Fund’s investment strategies and, as a result, the Fund may not meet its investment objective and/or underperform other investment vehicles with similar investment objectives and strategies.

Eventide Large Cap Value ETF | Market Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Market Risk. The value of securities in the Fund’s portfolio will fluctuate and, as a result, the Fund’s NAV or market price per share may decline suddenly or over a sustained period of time. Factors such as domestic and foreign economic growth rates and market conditions, interest rate levels, trading and tariff events and political events may adversely affect the securities markets.

Eventide Large Cap Value ETF | Medium (Mid) Capitalization Company Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Medium (Mid) Capitalization Company Risk. To the extent the Fund invests in the stocks of mid-sized companies, the Fund may be subject to additional risks. The earnings and prospects of these companies are more volatile than larger companies. These companies may experience higher failure rates than larger companies. Mid- sized companies normally have a lower trading volume than larger companies, which may tend to make their market price fall more disproportionately than larger companies in response to selling pressures. Mid-sized companies may also have limited markets, product lines or financial resources and may lack management experience.

Eventide Large Cap Value ETF | Real Estate Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Real Estate Risk. The Fund is subject to the risks of the real estate market as a whole, such as taxation, regulations and economic and political factors that negatively impact the real estate market and the direct ownership of real estate. These may include decreases in real estate values, overbuilding, rising operating costs, interest rates and property taxes. In addition, some real estate related investments are not fully diversified and are subject to the risks associated with financing a limited number of projects.

Eventide Large Cap Value ETF | REIT Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

REIT Risk. The Fund’s investments in REITs are subject to the same risks as direct investments in real estate, including sensitivity to general economic downturns and the volatility of local real estate markets. REITs may have limited financial resources and their securities may trade infrequently and in limited volume, and thus they may be more volatile than other securities. The liquidity of REITs may change dramatically over time.

Eventide Large Cap Value ETF | Regulatory Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Regulatory Risk. Regulatory authorities in the United States or other countries may adopt rules that restrict the ability of the Fund to fully implement its strategy, either generally, or with respect to certain securities, industries or countries, which may impact the Fund’s ability to fully implement its investment strategies. Policy changes by the U.S. government or its regulatory agencies and political events within the U.S. and abroad may, among other things, affect investor and consumer confidence and increase volatility in the financial markets, perhaps suddenly and to a significant degree, which may adversely impact the Fund’s operations, universe of potential investment options, and return potential. Regulators may interpret rules differently than the Fund or the securities industry generally, and disputes over such interpretations can increase legal and/or tax expenses incurred by the Fund.

Eventide Large Cap Value ETF | Small Capitalization Company Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Small Capitalization Company Risk. To the extent the Fund invests in the stocks of smaller-sized companies, the Fund may be subject to additional risks. The earnings and prospects of these companies are more volatile than larger companies. Smaller-sized companies may experience higher failure rates than do larger companies. The trading volume of securities of smaller-sized companies is normally less than that of larger companies and, therefore, may disproportionately affect their market price, tending to make them fall more in response to selling pressure than is the case with larger companies. Smaller-sized companies may have limited markets, product lines or financial resources and may lack management experience.

Eventide Large Cap Value ETF | Value Investing Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Value Investing Risk. A value style of investing focuses on undervalued companies with characteristics for improved valuations. “Value” securities are subject to the risk that their valuations never improve or that the returns on “value” securities are less than returns on other styles of investing or the overall stock market. Thus, the value of the Fund’s investments will vary and at times may be lower than that of other types of investments. Historically, value investments have performed best during periods of economic recovery. Therefore, the value investing style may over time go in and out of favor. Value stocks also may decline in price, even though in theory they are already underpriced.

Eventide Small Cap ETF

Prospectus [Line Items]

Risk [Text Block]

As with any ETF, there is no guarantee that the Fund will achieve its objective. Investment markets are unpredictable and there will be certain market conditions where the Fund will not meet its investment objective and will lose money. The Fund’s net asset value (“NAV”), market price and returns will vary, and you could lose money on your investment in the Fund and those losses could be significant. 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 government agency.

The following identifies the principal risks of investing in the Fund. These risks could adversely affect the NAV, market price, total return and the value of the Fund and your investment.

Authorized Participant Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants. An “Authorized Participant” is a participant in the Continuous Net Settlement System of the National Securities Clearing Corporation or the Depository Trust Company (“DTC”) and that has executed a Participant Agreement with the Fund’s distributor (“Distributor”). To the extent these Authorized Participants exit the business or are unable to process creation and/or redemption orders and no other Authorized Participant is able to step forward to process creation and/or redemption orders, in either of these cases, shares of the Fund may trade like closed-end fund shares at a discount to the Fund’s NAV per share and possibly face delisting by NYSE Arca, Inc. (the “Exchange”). These risks could cause intra-day bid/ask spreads for the Fund’s shares to widen.

Equity Securities Risk. The NAV and market price of the Fund will fluctuate based on changes in the value of the equity securities held by the Fund. Equity prices can fall rapidly in response to developments affecting a specific company or industry, or to changing economic, political or market conditions.

Ethical Investment Risk. The Fund’s ethical values screening criteria could cause it to underperform similar funds that do not have such screening criteria. This could be due to ethically acceptable companies falling out of favor with investors or failing to perform as well as companies that do not meet the Fund’s ethical screening guidelines.

To supplement its efforts in ethical investing, the Adviser may engage with portfolio companies to encourage consideration of corporate strategies aligned with the Adviser’s values, including pricing and/or business practices that may be beneficial within particular industries. The Adviser believes these activities will help promote ethical and effective corporate governance and long-term strategy for companies, and potentially create a positive effect on the particular businesses and/or industries, their consumers, and the Fund. There is no guarantee that the Adviser’s corporate engagements and related activities will achieve their intended results. There is a risk that the Adviser’s activities in this regard could limit the Fund’s investment universe and reduce the amount of profits that could be realized by affected companies, limiting the Fund’s investment returns. Furthermore, the U.S. government or any agency thereof, may enact rules or legislation that, directly or indirectly, materially impacts the Adviser’s activities in this regard, or materially affects the value of companies or opportunities for investment within particular industries.

ETF Structure Risks. The Fund, and any ETFs the Fund may invest in, are structured as ETFs and as a result are subject to special risks, including:

■ Not Individually Redeemable. Shares are not individually redeemable and may be redeemed by the Fund at NAV only in large blocks known as “Creation Units.” Fund shares are typically bought and sold in the secondary market and investors typically pay brokerage commissions or other charges on these transactions.

■ Trading Issues. Trading in shares on the Exchange may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in shares inadvisable, such as extraordinary market volatility. There can be no assurance that Shares will continue to meet the listing requirements of the Exchange. An active trading market for the Fund’s shares may not be developed or maintained. If the Fund’s shares are traded outside a collateralized settlement system, the number of financial institutions that can act as authorized participants that can post collateral on an agency basis is limited, which may limit the market for the Fund’s shares.

■ Market Price Variance Risk. The market prices of shares will fluctuate in response to changes in NAV and supply and demand for shares and will include a “bid-ask spread” charged by the exchange specialists, market makers or other participants that trade the particular security. There may be times when the market price and the NAV vary significantly. This means that Shares may trade at a discount to NAV and intra-day bid/ask spreads may widen.

■ In times of market stress, market makers may step away from their role market making in shares of ETFs and in executing trades, which can lead to differences between the market value of Fund shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

■ The market price for the Fund’s shares may deviate from the Fund’s NAV, particularly during times of market stress, with the result that investors may pay significantly more or significantly less for Fund shares than the Fund’s NAV, which is reflected in the bid and ask price for Fund shares or in the closing price.

■ When all or a portion of an ETF’s underlying securities trade in a market that is closed when the market for the Fund’s shares is open, there may be changes from the last quote of the closed market and the quote from the Fund’s domestic trading day, which could lead to differences between the market value of the Fund’s shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

■ In stressed market conditions, the market for the Fund’s shares may become less liquid in response to the deteriorating liquidity of the Fund’s portfolio. This adverse effect on the liquidity of the Fund’s shares may, in turn, lead to differences between the market value of the Fund’s shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

Industry Concentration Risk. The Fund may concentrate 25% to 35% of its total assets in a particular industry or group of industries to the extent that such industry or group of industries represents 20% or more of the Fund’s Strategy Benchmark. A fund that concentrates its investments in an industry or group of industries is more vulnerable to adverse market, economic, regulatory, political or other developments affecting such industry or group of industries than a fund that invests its assets more broadly.

Investment Style Risk. The type of securities in which the Fund focuses may underperform other assets or the overall market.

Issuer Specific Risk. The performance of the Fund depends on the performance of the issuers of the individual securities in which the Fund invests. Poor performance by any issuer may cause the value of its securities, and the value of the Fund’s Shares, to decline. The value of a specific security can be more volatile than the market as a whole and can perform differently from the value of the market as a whole. The value of securities of smaller issuers can be more volatile than those of larger issuers. The value of certain types of securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments. Market prices of securities in broad market segments may be adversely affected by a prominent issuer having experienced losses, lack of earnings, failure to meet the market’s expectations with respect to new products or services, or even by factors wholly unrelated to the value or condition of the issuer, such as changes in interest rates.

Limited History of Operations Risk. The Fund has a limited history of operations for investors to evaluate.

Management Risk. The Adviser’s reliance on its sector allocation and risk management strategies and related judgments about the value and potential appreciation of securities in which the Fund invests may prove to be incorrect. The Adviser may not successfully implement the Fund’s investment strategies and, as a result, the Fund may not meet its investment objective and/or underperform other investment vehicles with similar investment objectives and strategies.

Market Risk. The value of securities in the Fund’s portfolio will fluctuate and, as a result, the Fund’s NAV or market price per share may decline suddenly or over a sustained period of time. Factors such as domestic and foreign economic growth rates and market conditions, interest rate levels, trading and tariff events and political events may adversely affect the securities markets.

Real Estate Risk. The Fund is subject to the risks of the real estate market as a whole, such as taxation, regulations and economic and political factors that negatively impact the real estate market and the direct ownership of real estate. These may include decreases in real estate values, overbuilding, rising operating costs, interest rates and property taxes. In addition, some real estate related investments are not fully diversified and are subject to the risks associated with financing a limited number of projects.

REIT Risk. The Fund’s investments in REITs are subject to the same risks as direct investments in real estate, including sensitivity to general economic downturns and the volatility of local real estate markets. REITs may have limited financial resources and their securities may trade infrequently and in limited volume, and thus they may be more volatile than other securities. The liquidity of REITs may change dramatically over time.

Regulatory Risk. Regulatory authorities in the United States or other countries may adopt rules that restrict the ability of the Fund to fully implement its strategy, either generally, or with respect to certain securities, industries or countries, which may impact the Fund’s ability to fully implement its investment strategies. Policy changes by the U.S. government or its regulatory agencies and political events within the U.S. and abroad may, among other things, affect investor and consumer confidence and increase volatility in the financial markets, perhaps suddenly and to a significant degree, which may adversely impact the Fund’s operations, universe of potential investment options, and return potential. Regulators may interpret rules differently than the Fund or the securities industry generally, and disputes over such interpretations can increase legal and/or tax expenses incurred by the Fund.

Small Capitalization Company Risk. To the extent the Fund invests in the stocks of smaller-sized companies, the Fund may be subject to additional risks. The earnings and prospects of these companies are more volatile than larger companies. Smaller-sized companies may experience higher failure rates than do larger companies. The trading volume of securities of smaller-sized companies is normally less than that of larger companies and, therefore, may disproportionately affect their market price, tending to make them fall more in response to selling pressure than is the case with larger companies. Smaller-sized companies may have limited markets, product lines or financial resources and may lack management experience.

For more information, please see the section of the Fund’s Prospectus entitled “Additional Information About the Fund’s Principal Investment Strategies and Related Risks.” 

Eventide Small Cap ETF | Authorized Participant Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Authorized Participant Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants. An “Authorized Participant” is a participant in the Continuous Net Settlement System of the National Securities Clearing Corporation or the Depository Trust Company (“DTC”) and that has executed a Participant Agreement with the Fund’s distributor (“Distributor”). To the extent these Authorized Participants exit the business or are unable to process creation and/or redemption orders and no other Authorized Participant is able to step forward to process creation and/or redemption orders, in either of these cases, shares of the Fund may trade like closed-end fund shares at a discount to the Fund’s NAV per share and possibly face delisting by NYSE Arca, Inc. (the “Exchange”). These risks could cause intra-day bid/ask spreads for the Fund’s shares to widen.

Eventide Small Cap ETF | Equity Securities Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Equity Securities Risk. The NAV and market price of the Fund will fluctuate based on changes in the value of the equity securities held by the Fund. Equity prices can fall rapidly in response to developments affecting a specific company or industry, or to changing economic, political or market conditions.

Eventide Small Cap ETF | Ethical Investment Risk [Member]

Prospectus [Line Items]

Risk [Text Block]

Ethical Investment Risk. The Fund’s ethical values screening criteria could cause it to underperform similar funds that do not have such screening criteria. This could be due to ethically acceptable companies falling out of favor with investors or failing to perform as well as companies that do not meet the Fund’s ethical screening guidelines.

Eventide Small Cap ETF | ETF Structure Risks [Member]

Prospectus [Line Items]

Risk [Text Block]

ETF Structure Risks. The Fund, and any ETFs the Fund may invest in, are structured as ETFs and as a result are subject to special risks, including:

■ Not Individually Redeemable. Shares are not individually redeemable and may be redeemed by the Fund at NAV only in large blocks known as “Creation Units.” Fund shares are typically bought and sold in the secondary market and investors typically pay brokerage commissions or other charges on these transactions.

■ Trading Issues. Trading in shares on the Exchange may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in shares inadvisable, such as extraordinary market volatility. There can be no assurance that Shares will continue to meet the listing requirements of the Exchange. An active trading market for the Fund’s shares may not be developed or maintained. If the Fund’s shares are traded outside a collateralized settlement system, the number of financial institutions that can act as authorized participants that can post collateral on an agency basis is limited, which may limit the market for the Fund’s shares.

■ Market Price Variance Risk. The market prices of shares will fluctuate in response to changes in NAV and supply and demand for shares and will include a “bid-ask spread” charged by the exchange specialists, market makers or other participants that trade the particular security. There may be times when the market price and the NAV vary significantly. This means that Shares may trade at a discount to NAV and intra-day bid/ask spreads may widen.

■ In times of market stress, market makers may step away from their role market making in shares of ETFs and in executing trades, which can lead to differences between the market value of Fund shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

■ The market price for the Fund’s shares may deviate from the Fund’s NAV, particularly during times of market stress, with the result that investors may pay significantly more or significantly less for Fund shares than the Fund’s NAV, which is reflected in the bid and ask price for Fund shares or in the closing price.

■ When all or a portion of an ETF’s underlying securities trade in a market that is closed when the market for the Fund’s shares is open, there may be changes from the last quote of the closed market and the quote from the Fund’s domestic trading day, which could lead to differences between the market value of the Fund’s shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

■ In stressed market conditions, the market for the Fund’s shares may become less liquid in response to the deteriorating liquidity of the Fund’s portfolio. This adverse effect on the liquidity of the Fund’s shares may, in turn, lead to differences between the market value of the Fund’s shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

Eventide Small Cap ETF | Not Individually Redeemable [Member]

Prospectus [Line Items]

Risk [Text Block]

■ Not Individually Redeemable. Shares are not individually redeemable and may be redeemed by the Fund at NAV only in large blocks known as “Creation Units.” Fund shares are typically bought and sold in the secondary market and investors typically pay brokerage commissions or other charges on these transactions.

Eventide Small Cap ETF | Trading Issues [Member]

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Risk [Text Block]

■ Trading Issues. Trading in shares on the Exchange may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in shares inadvisable, such as extraordinary market volatility. There can be no assurance that Shares will continue to meet the listing requirements of the Exchange. An active trading market for the Fund’s shares may not be developed or maintained. If the Fund’s shares are traded outside a collateralized settlement system, the number of financial institutions that can act as authorized participants that can post collateral on an agency basis is limited, which may limit the market for the Fund’s shares.

Eventide Small Cap ETF | Market Price Variance Risk [Member]

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Risk [Text Block]

■ Market Price Variance Risk. The market prices of shares will fluctuate in response to changes in NAV and supply and demand for shares and will include a “bid-ask spread” charged by the exchange specialists, market makers or other participants that trade the particular security. There may be times when the market price and the NAV vary significantly. This means that Shares may trade at a discount to NAV and intra-day bid/ask spreads may widen.

■ In times of market stress, market makers may step away from their role market making in shares of ETFs and in executing trades, which can lead to differences between the market value of Fund shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

■ The market price for the Fund’s shares may deviate from the Fund’s NAV, particularly during times of market stress, with the result that investors may pay significantly more or significantly less for Fund shares than the Fund’s NAV, which is reflected in the bid and ask price for Fund shares or in the closing price.

■ When all or a portion of an ETF’s underlying securities trade in a market that is closed when the market for the Fund’s shares is open, there may be changes from the last quote of the closed market and the quote from the Fund’s domestic trading day, which could lead to differences between the market value of the Fund’s shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

■ In stressed market conditions, the market for the Fund’s shares may become less liquid in response to the deteriorating liquidity of the Fund’s portfolio. This adverse effect on the liquidity of the Fund’s shares may, in turn, lead to differences between the market value of the Fund’s shares and the Fund’s NAV, which could cause the intra-day bid/ask spread of the Fund to widen.

Eventide Small Cap ETF | Industry Concentration Risk [Member]

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Risk [Text Block]

Industry Concentration Risk. The Fund may concentrate 25% to 35% of its total assets in a particular industry or group of industries to the extent that such industry or group of industries represents 20% or more of the Fund’s Strategy Benchmark. A fund that concentrates its investments in an industry or group of industries is more vulnerable to adverse market, economic, regulatory, political or other developments affecting such industry or group of industries than a fund that invests its assets more broadly.

Eventide Small Cap ETF | Investment Style Risk [Member]

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Risk [Text Block]

Investment Style Risk. The type of securities in which the Fund focuses may underperform other assets or the overall market.

Eventide Small Cap ETF | Issuer Specific Risk [Member]

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Risk [Text Block]

Issuer Specific Risk. The performance of the Fund depends on the performance of the issuers of the individual securities in which the Fund invests. Poor performance by any issuer may cause the value of its securities, and the value of the Fund’s Shares, to decline. The value of a specific security can be more volatile than the market as a whole and can perform differently from the value of the market as a whole. The value of securities of smaller issuers can be more volatile than those of larger issuers. The value of certain types of securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments. Market prices of securities in broad market segments may be adversely affected by a prominent issuer having experienced losses, lack of earnings, failure to meet the market’s expectations with respect to new products or services, or even by factors wholly unrelated to the value or condition of the issuer, such as changes in interest rates.

Eventide Small Cap ETF | Limited History of Operations Risk [Member]

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Risk [Text Block]

Limited History of Operations Risk. The Fund has a limited history of operations for investors to evaluate.

Eventide Small Cap ETF | Management Risk [Member]

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Management Risk. The Adviser’s reliance on its sector allocation and risk management strategies and related judgments about the value and potential appreciation of securities in which the Fund invests may prove to be incorrect. The Adviser may not successfully implement the Fund’s investment strategies and, as a result, the Fund may not meet its investment objective and/or underperform other investment vehicles with similar investment objectives and strategies.

Eventide Small Cap ETF | Market Risk [Member]

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Risk [Text Block]

Market Risk. The value of securities in the Fund’s portfolio will fluctuate and, as a result, the Fund’s NAV or market price per share may decline suddenly or over a sustained period of time. Factors such as domestic and foreign economic growth rates and market conditions, interest rate levels, trading and tariff events and political events may adversely affect the securities markets.

Eventide Small Cap ETF | Real Estate Risk [Member]

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Risk [Text Block]

Real Estate Risk. The Fund is subject to the risks of the real estate market as a whole, such as taxation, regulations and economic and political factors that negatively impact the real estate market and the direct ownership of real estate. These may include decreases in real estate values, overbuilding, rising operating costs, interest rates and property taxes. In addition, some real estate related investments are not fully diversified and are subject to the risks associated with financing a limited number of projects.

Eventide Small Cap ETF | REIT Risk [Member]

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Risk [Text Block]

REIT Risk. The Fund’s investments in REITs are subject to the same risks as direct investments in real estate, including sensitivity to general economic downturns and the volatility of local real estate markets. REITs may have limited financial resources and their securities may trade infrequently and in limited volume, and thus they may be more volatile than other securities. The liquidity of REITs may change dramatically over time.

Eventide Small Cap ETF | Regulatory Risk [Member]

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Regulatory Risk. Regulatory authorities in the United States or other countries may adopt rules that restrict the ability of the Fund to fully implement its strategy, either generally, or with respect to certain securities, industries or countries, which may impact the Fund’s ability to fully implement its investment strategies. Policy changes by the U.S. government or its regulatory agencies and political events within the U.S. and abroad may, among other things, affect investor and consumer confidence and increase volatility in the financial markets, perhaps suddenly and to a significant degree, which may adversely impact the Fund’s operations, universe of potential investment options, and return potential. Regulators may interpret rules differently than the Fund or the securities industry generally, and disputes over such interpretations can increase legal and/or tax expenses incurred by the Fund.

Eventide Small Cap ETF | Small Capitalization Company Risk [Member]

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Risk [Text Block]

Small Capitalization Company Risk. To the extent the Fund invests in the stocks of smaller-sized companies, the Fund may be subject to additional risks. The earnings and prospects of these companies are more volatile than larger companies. Smaller-sized companies may experience higher failure rates than do larger companies. The trading volume of securities of smaller-sized companies is normally less than that of larger companies and, therefore, may disproportionately affect their market price, tending to make them fall more in response to selling pressure than is the case with larger companies. Smaller-sized companies may have limited markets, product lines or financial resources and may lack management experience.