Feb. 28, 2026 |
| MFS Active Core Plus Bond ETF
|
Risk Table - MFS Active Core Plus Bond ETF
|
Risk [Text Block] |
| Principal Risks |
Principal Risks As with any exchange-traded
fund, the fund may not achieve its objective and/or you could lose money on your investment in the fund.
An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit
Insurance Corporation or any other governmental agency. The principal
risks of investing in the fund are:
|
| Risk Lose Money [Member] |
As with any exchange-traded
fund, the fund may not achieve its objective and/or you could lose money on your investment in the fund.
|
| Risk Not Insured [Member] |
An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit
Insurance Corporation or any other governmental agency.
|
| Investment Selection Risk |
Investment Selection Risk:
MFS' investment analysis and its selection of investments may not produce the
intended results and/or can lead to an investment focus that results in the fund underperforming other
funds with similar investment strategies and/or underperforming the markets in which the fund invests.
In addition, to the extent MFS considers quantitative tools in managing the fund, such tools may not
produce the intended results.
|
| Debt Market Risk |
Debt Market Risk: Debt
markets can be volatile and can decline significantly in response to changes in, or investor perceptions
of, issuer, market, economic, industry, political, regulatory, geopolitical, environmental, public health,
and other conditions. These conditions can affect a single instrument, issuer, or borrower, a particular
type of instrument, issuer, or borrower, a segment of the debt markets or the debt markets generally.
Certain events can have a dramatic adverse effect on debt markets and may lead to periods of high volatility
and reduced liquidity in a debt market or segment of a debt market.
|
| Interest Rate Risk |
Interest
Rate Risk: In general, the price of
a debt instrument falls when interest rates rise and rises when interest rates fall. Interest rate risk
is generally greater for instruments with longer maturities or durations, or that do not pay current
interest.
|
| Credit Risk |
Credit Risk: The price of a debt instrument
depends, in part, on the credit quality of the issuer, borrower, counterparty, or other entity responsible
for payment, or underlying collateral or assets and the terms of the instrument. The price of a debt
instrument can decline in response to changes in, or perceptions of, the financial condition of the issuer,
borrower, counterparty, or other entity, or underlying collateral or assets, or changes in, or perceptions
of, specific or general market, economic, industry, political, regulatory, geopolitical, environmental,
public health, and other conditions. Debt instruments may be more susceptible to downgrades or defaults
during economic downturns or similar periods of economic stress, which in turn could negatively affect
the market value and liquidity of a debt instrument. Below investment
grade quality debt instruments (commonly referred to as “high yield securities” or “junk bonds”)
can involve a substantially greater risk of default or can already be in default, and their values can
decline significantly. Below investment grade quality debt instruments are regarded as having predominantly
speculative characteristics. Below investment grade quality debt instruments tend to be more sensitive
to adverse news about the issuer, or the market or economy in general, than higher quality debt instruments.
|
| Foreign Risk |
Foreign
Risk: Exposure to foreign markets through issuers or currencies can involve additional
risks relating to market, economic, industry, political, regulatory, geopolitical, environmental, public
health, and other conditions. These factors can make foreign investments, especially those tied economically
to emerging markets or countries subject to sanctions or the threat of new or modified sanctions, more
volatile and less liquid than U.S. investments. In addition, foreign markets can react differently to
these conditions than the U.S. market.
|
| Emerging Markets Risk |
Emerging Markets Risk:
Investments tied economically to emerging markets, especially frontier markets, can involve additional
and greater risks than the risks associated with investments in developed markets. Emerging markets
can have less developed markets, greater custody and operational
risk, less developed legal, regulatory, and accounting systems, greater government involvement in the
economy, greater risk of new or inconsistent government treatment of or restrictions on issuers and instruments,
and greater political, social, geopolitical, and economic instability than developed markets.
|
| Focus Risk |
Focus
Risk: Issuers in a single industry, sector, country, or region can react similarly to
market, currency, political, economic, regulatory, geopolitical, environmental, public health, and other
conditions, and the fund's performance will be affected by the conditions in the industries, sectors,
countries, and regions to which the fund is exposed. Furthermore, investments in particular industries,
sectors, countries, or regions may be more volatile than the broader market as a whole. If MFS invests a significant percentage of the fund's assets in a single issuer
or small number of issuers, the fund’s performance could be more volatile than the performance of more
diversified funds.
|
| Prepayment/Extension Risk |
Prepayment/Extension Risk: Instruments
subject to prepayment and/or extension can reduce the potential for gain for the instrument’s holders
if the instrument is prepaid and increase the potential for loss if the maturity of the instrument is
extended.
|
| Municipal Risk |
Municipal Risk: The price
of a municipal instrument can be volatile and significantly affected by adverse tax changes or court
rulings, legislative or political changes, changes in specific or general market and economic conditions
and developments, and the financial condition of municipal issuers and insurers. Because many municipal
instruments are issued to finance similar projects, conditions in certain industries can significantly
affect the fund and the overall municipal market. Municipal instruments may be more susceptible to downgrades
or defaults during economic downturns or similar periods of economic stress, which in turn could affect
the market values and marketability of many or all municipal obligations of issuers in a state, U.S.
territory, or possession. In addition, because some
municipal obligations may be secured or guaranteed by banks and other institutions, the risk associated
with investments in such municipal securities could increase if the banking or financial sector suffers
an economic downturn and/or if the credit ratings of the institutions issuing the guarantee are downgraded
or at risk of being downgraded by a national rating organization. If such events occur, the value of
the security could decrease or the value could be lost entirely, and it may be difficult or impossible
to sell the security at the time and the price that normally prevails in the market.
|
| When-Issued, Delayed Delivery, and Forward Commitment Transaction Risk |
When-Issued,
Delayed Delivery, and Forward Commitment Transaction Risk: The purchaser in a when-issued,
delayed delivery or forward commitment transaction assumes the rights and risks of ownership, including
the risks of price and yield fluctuations and the risk that the security will not be issued or delivered
as anticipated. When-issued, delayed delivery, and forward commitment transactions can involve leverage.
TBA transactions may significantly increase the fund's portfolio turnover rate.
|
| Derivatives Risk |
Derivatives
Risk: Derivatives can be highly volatile and involve risks in addition
to the risks of the underlying indicator(s) on which the derivative is based. Gains or losses from derivatives
can be substantially greater than the derivatives’ original cost. Derivatives can involve leverage.
|
| Leveraging Risk |
Leveraging
Risk: Leverage involves investment exposure in an amount exceeding
the initial investment. Leverage can cause increased volatility by magnifying gains or losses.
|
| Counterparty and Third Party Risk |
Counterparty
and Third Party Risk: Transactions involving a
counterparty or third party other than the issuer of the instrument are subject to the credit risk of
the counterparty or third party, and to the counterparty’s or third party’s ability or willingness
to perform in accordance with the terms of the transaction.
|
| Liquidity Risk |
Liquidity
Risk: It may be difficult to value, and it may not be possible to
sell, certain investments, types of investments, and/or investments in certain segments of the market,
and the fund may have to sell certain of these investments at prices or times that are not advantageous
in order to meet redemptions or other cash needs.
|
| Fluctuation of Net Asset Value and Share Price Risk |
Fluctuation
of Net Asset Value and Share Price Risk: The net asset value (NAV) per share of the
fund will generally fluctuate with changes in the market value of the fund’s holdings. The fund’s
shares can be bought and sold in the secondary market at market prices. Disruptions to purchases and
sales, the existence of extreme market volatility, and/or a lack of an active trading market for the
fund's shares may result in the fund's shares trading significantly above (at a premium) or below (at
a discount) to NAV and bid/ask spreads may widen. Shares of the fund may trade at a larger premium or
discount to the NAV than shares of other ETFs that focus on other market segments or types of securities.
In addition, in stressed market conditions or periods of market disruption or volatility, the market
for shares of the fund may become less liquid in response to deteriorating liquidity in the markets for
the fund’s underlying portfolio holdings. If you buy fund shares when their market price is at a premium
or sell fund shares when their market prices is at a discount, you may pay more than, or receive less
than, NAV, respectively.
|
| Authorized Participant Risks |
Authorized Participant Risks: Only
financial institutions authorized to transact daily with the fund (Authorized Participants) may engage
in creation or redemption transactions directly with the fund, and Authorized Participants are not obligated
to do so. To the extent an Authorized Participant cannot or is otherwise unwilling to engage in creation
and redemption transactions, and no other Authorized Participant engages in such transactions, shares
of the fund may trade at a significant discount or premium to NAV, experience wider intraday bid/ask
spreads, and may face trading halts and/or delisting from the exchange.
|
| Trading Issues Risk |
Trading
Issues Risk: There can be no assurance that an active trading market for
the fund’s shares will develop or be maintained. In addition, trading of the fund’s shares may be
halted or become less liquid. Shares of the fund, similar to shares of other issuers listed on a stock
exchange, may be sold short and are therefore subject to the risk of increased volatility and price decreases
associated with being sold short. Most fund investors will buy
and sell fund shares on the listing exchange or on another secondary market. When buying or selling shares
of the fund, investors typically will pay brokerage commissions or other charges imposed by financial
intermediaries as determined by that financial intermediary.
|
| Cash Transactions Risk |
Cash
Transactions Risk: Unlike certain ETFs that distribute portfolio securities
entirely in-kind, the fund may effect some or all creations and redemptions using cash, rather than in-kind
securities. As a result, an investment in the fund may be less tax-efficient than an investment in an
ETF that distributes portfolio securities entirely in-kind.
|
|
| MFS Active Growth ETF
|
Risk Table - MFS Active Growth ETF
|
Risk [Text Block] |
| Principal Risks |
Principal
Risks As with any exchange-traded fund, the fund may not achieve
its objective and/or you could lose money on your investment in the fund. An investment in the fund is
not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any
other governmental agency. The principal risks of investing in the fund
are:
|
| Risk Lose Money [Member] |
As with any exchange-traded fund, the fund may not achieve
its objective and/or you could lose money on your investment in the fund.
|
| Risk Not Insured [Member] |
An investment in the fund is
not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any
other governmental agency.
|
| Investment Selection Risk |
Investment Selection Risk: MFS'
investment analysis and its selection of investments may not produce the intended results and/or can
lead to an investment focus that results in the fund underperforming other funds with similar investment
strategies and/or underperforming the markets in which the fund invests. In addition, to the extent
MFS considers quantitative tools in managing the fund, such tools may not produce the intended results.
|
| Equity Market Risk/Company Risk |
Equity Market Risk/Company Risk: Equity
markets are volatile and can decline significantly in response to changes in, or investor perceptions
of, issuer, market, economic, industry, political, regulatory, geopolitical, environmental, public health,
and other conditions. These conditions can affect a single issuer or type of security, issuers within
a broad market sector, industry or geographic region, or the equity markets in general. Certain events
can have a dramatic adverse effect on equity markets and may lead to periods of high volatility in an
equity market or a segment of an equity market. The value of an investment held by the fund may decline
due to factors directly related to the issuer.
|
| Growth Company Risk |
Growth
Company Risk: The stocks of growth companies can be more sensitive to the
company’s earnings and more volatile than the market in general.
|
| Foreign Risk |
Foreign
Risk: Exposure to foreign markets through issuers or currencies can involve additional
risks relating to market, economic, industry, political, regulatory, geopolitical, environmental, public
health, and other conditions. These factors can make foreign investments, especially those tied economically
to countries with developing economies or countries subject to sanctions or the threat of new or modified
sanctions, more volatile and less liquid than U.S. investments. In addition, foreign markets can react
differently to these conditions than the U.S. market.
|
| Focus Risk |
Focus Risk:
Issuers in a single industry, sector, country, or region can react similarly to
market, currency, political, economic, regulatory, geopolitical, environmental, public health, and other
conditions, and the fund's performance will be affected by the conditions in the industries, sectors,
countries, and regions to which the fund is exposed. Furthermore, investments in particular industries,
sectors, countries, or regions may be more volatile than the broader market as a whole.
|
| Non-Diversification Risk |
Non-Diversification
Risk: Because MFS may invest a significant percentage of the fund’s
assets in a single issuer or small number of issuers, the fund’s performance could be closely tied
to the value of that one issuer or issuers, and could be more volatile than the performance of diversified
funds.
|
| Liquidity Risk |
Liquidity
Risk: It may be difficult to value, and it may not be possible to
sell, certain investments, types of investments, and/or investments in certain segments of the market,
and the fund may have to sell certain of these investments at prices or times that are not advantageous
in order to meet redemptions or other cash needs.
|
| Fluctuation of Net Asset Value and Share Price Risk |
Fluctuation
of Net Asset Value and Share Price Risk: The net asset value (NAV) per share of the
fund will generally fluctuate with changes in the market value of the fund’s holdings. The fund’s
shares can be bought and sold in the secondary market at market prices. Disruptions to purchases and
sales, the existence of extreme market volatility, and/or a lack of an active trading market for the
fund's shares may result in the fund's shares trading significantly above (at a premium) or below (at
a discount) to NAV and bid/ask spreads may widen. Shares of the fund may trade at a larger premium or
discount to the NAV than shares of other ETFs that focus on other market segments or types of securities.
In addition, in stressed market conditions or periods of market disruption or volatility, the market
for shares of the fund may become less liquid in response to deteriorating liquidity in the markets for
the fund’s underlying portfolio holdings. If you buy fund shares when their market price is at a premium
or sell fund shares when their market prices is at a discount, you may pay more than, or receive less
than, NAV, respectively.
|
| Authorized Participant Risks |
Authorized Participant Risks: Only
financial institutions authorized to transact daily with the fund (Authorized Participants) may engage
in creation or redemption transactions directly with the fund, and Authorized Participants are not obligated
to do so. To the extent an Authorized Participant cannot or is otherwise unwilling to engage in creation
and redemption transactions, and no other Authorized Participant engages in such transactions, shares
of the fund may trade at a significant discount or premium to NAV, experience wider intraday bid/ask
spreads, and may face trading halts and/or delisting from the exchange.
|
| Trading Issues Risk |
Trading
Issues Risk: There can be no assurance that an active trading market for
the fund’s shares will develop or be maintained. In addition, trading of the fund’s shares may be
halted or become less liquid. Shares of the fund, similar to shares of other issuers listed on a stock
exchange, may be sold short and are therefore subject to the risk of increased volatility and price decreases
associated with being sold short. Most fund investors will buy
and sell fund shares on the listing exchange or on another secondary market. When buying or selling shares
of the fund, investors typically will pay brokerage commissions or other charges imposed by financial
intermediaries as determined by that financial intermediary.
|
| Cash Transactions Risk |
Cash Transactions
Risk: Unlike certain ETFs that distribute portfolio securities entirely in-kind, the
fund may effect some or all creations and redemptions using cash, rather than in-kind securities. As
a result, an investment in the fund may be less tax-efficient than an investment in an ETF that distributes
portfolio securities entirely in-kind.
|
|
| MFS Active Intermediate Muni Bond ETF
|
Risk Table - MFS Active Intermediate Muni Bond ETF
|
Risk [Text Block] |
| Principal Risks |
Principal Risks As with any exchange-traded
fund, the fund may not achieve its objective and/or you could lose money on your investment in the fund.
An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit
Insurance Corporation or any other governmental agency. The principal
risks of investing in the fund are:
|
| Risk Lose Money [Member] |
As with any exchange-traded
fund, the fund may not achieve its objective and/or you could lose money on your investment in the fund.
|
| Risk Not Insured [Member] |
An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit
Insurance Corporation or any other governmental agency.
|
| Investment Selection Risk |
Investment Selection Risk:
MFS' investment analysis and its selection of investments may not produce the
intended results and/or can lead to an investment focus that results in the fund underperforming other
funds with similar investment strategies and/or underperforming the markets in which the fund invests.
In addition, to the extent MFS considers quantitative tools in managing the fund, such tools may not
produce the intended results.
|
| Debt Market Risk |
Debt Market Risk: Debt
markets can be volatile and can decline significantly in response to changes in, or investor perceptions
of, issuer, market, economic, industry, political, regulatory, geopolitical, environmental, public health,
and other conditions. These conditions can affect a single instrument, issuer, or borrower, a particular
type of instrument, issuer, or borrower, a segment of the debt markets or the debt markets generally.
Certain events can have a dramatic adverse effect on debt markets and may lead to periods of high volatility
and reduced liquidity in a debt market or segment of a debt market.
|
| Interest Rate Risk |
Interest
Rate Risk: In general, the price of
a debt instrument falls when interest rates rise and rises when interest rates fall. Interest rate risk
is generally greater for instruments with longer maturities or durations, or that do not pay current
interest.
|
| Credit Risk |
Credit Risk: The price of a debt instrument
depends, in part, on the credit quality of the issuer, borrower, counterparty, or other entity responsible
for payment, or underlying collateral or assets and the terms of the instrument. The price of a debt
instrument can decline in response to changes in, or perceptions of, the financial condition of the issuer,
borrower, counterparty, or other entity, or underlying collateral or assets, or changes in, or perceptions
of, specific or general market, economic, industry, political, regulatory, geopolitical, environmental,
public health, and other conditions. Debt instruments may be more susceptible to downgrades or defaults
during economic downturns or similar periods of economic stress, which in turn could negatively affect
the market value and liquidity of a debt instrument. The credit
quality of, and the ability to pay principal and interest when due by, an issuer of a municipal instrument
depends on the credit quality of the entity supporting the municipal instrument, how essential any services
supported by the municipal instrument are, the sufficiency of any revenues or taxes that support the
municipal instrument, and/or the willingness or ability of the appropriate government entity to approve
any appropriations necessary to support the municipal instrument. In addition, the price of a municipal
instrument also depends on its credit quality and ability to meet the credit support obligations of any
insurer or other entity providing credit support to a municipal instrument. Below
investment grade quality debt instruments (commonly referred to as “high yield securities” or “junk
bonds”) can involve a substantially greater risk of default or can already be in default, and their
values can decline significantly. Below investment grade quality debt instruments are regarded as having
predominantly speculative characteristics. Below investment grade quality debt instruments tend to be
more sensitive to adverse news about the issuer, or the market or economy in general, than higher quality
debt instruments.
|
| Municipal Risk |
Municipal Risk: The price of a municipal
instrument can be volatile and significantly affected by adverse tax changes or court rulings, legislative
or political changes, changes in specific or general market and economic conditions and developments,
and the financial condition of municipal issuers and insurers. Because many municipal instruments are
issued to finance similar projects, conditions in certain industries can significantly affect the fund
and the overall municipal market. Municipal instruments may be more susceptible to downgrades or defaults
during economic downturns or similar periods of economic stress, which in turn could affect the market
values and marketability of many or all municipal obligations of issuers in a state, U.S. territory,
or possession. In addition, because some municipal obligations
may be secured or guaranteed by banks and other institutions, the risk associated with investments in
such municipal securities could increase if the banking or financial sector suffers an economic downturn
and/or if the credit ratings of the institutions issuing the guarantee are downgraded or at risk of being
downgraded by a national rating organization. If such events occur, the value of the security could decrease
or the value could be lost entirely, and it may be difficult or impossible to sell the security at the
time and the price that normally prevails in the market.
|
| Focus Risk |
Focus Risk:
The fund’s performance will be closely tied to the issuer, market, economic,
industry, political, regulatory, geopolitical, environmental, public health, and other conditions in
the states, territories, and possessions of the United States in which the fund's assets are invested.
If MFS invests a significant percentage of the fund's assets in a single state, territory, or possession,
or a small number of states, territories, or possessions, these conditions will have a significant impact
on the fund's performance and the fund's performance may be more volatile than the performance of more
geographically-diversified funds.
|
| Prepayment/Extension Risk |
Prepayment/Extension Risk:
Instruments subject to prepayment and/or extension can reduce
the potential for gain for the instrument’s holders if the instrument is prepaid and increase the potential
for loss if the maturity of the instrument is extended.
|
| Derivatives Risk |
Derivatives
Risk: Derivatives can be highly volatile and involve risks in addition
to the risks of the underlying indicator(s) on which the derivative is based. Gains or losses from derivatives
can be substantially greater than the derivatives’ original cost. Derivatives can involve leverage.
|
| Leveraging Risk |
Leveraging
Risk: Leverage involves investment exposure in an amount exceeding
the initial investment. Leverage can cause increased volatility by magnifying gains or losses.
|
| Counterparty and Third Party Risk |
Counterparty
and Third Party Risk: Transactions involving a
counterparty or third party other than the issuer of the instrument are subject to the credit risk of
the counterparty or third party, and to the counterparty’s or third party’s ability or willingness
to perform in accordance with the terms of the transaction.
|
| Liquidity Risk |
Liquidity
Risk: It may be difficult to value, and it may not be possible to
sell, certain investments, types of investments, and/or investments in certain segments of the market,
and the fund may have to sell certain of these investments at prices or times that are not advantageous
in order to meet redemptions or other cash needs.
|
| Fluctuation of Net Asset Value and Share Price Risk |
Fluctuation
of Net Asset Value and Share Price Risk: The net asset value (NAV) per share of the
fund will generally fluctuate with changes in the market value of the fund’s holdings. The fund’s
shares can be bought and sold in the secondary market at market prices. Disruptions to purchases and
sales, the existence of extreme market volatility, and/or a lack of an active trading market for the
fund's shares may result in the fund's shares trading significantly above (at a premium) or below (at
a discount) to NAV and bid/ask spreads may widen. Shares of the fund may trade at a larger premium or
discount to the NAV than shares of other ETFs that focus on other market segments or types of securities.
In addition, in stressed market conditions or periods of market disruption or volatility, the market
for shares of the fund may become less liquid in response to deteriorating liquidity in the markets for
the fund’s underlying portfolio holdings. If you buy fund shares when their market price is at a premium
or sell fund shares when their market prices is at a discount, you may pay more than, or receive less
than, NAV, respectively.
|
| Authorized Participant Risks |
Authorized Participant Risks: Only
financial institutions authorized to transact daily with the fund (Authorized Participants) may engage
in creation or redemption transactions directly with the fund, and Authorized Participants are not obligated
to do so. To the extent an Authorized Participant cannot or is otherwise unwilling to engage in creation
and redemption transactions, and no other Authorized Participant engages in such transactions, shares
of the fund may trade at a significant discount or premium to NAV, experience wider intraday bid/ask
spreads, and may face trading halts and/or delisting from the exchange.
|
| Trading Issues Risk |
Trading
Issues Risk: There can be no assurance that an active trading market for
the fund’s shares will develop or be maintained. In addition, trading of the fund’s shares may be
halted or become less liquid. Shares of the fund, similar to shares of other issuers listed on a stock
exchange, may be sold short and are therefore subject to the risk of increased volatility and price decreases
associated with being sold short. Most fund investors will buy
and sell fund shares on the listing exchange or on another secondary market. When buying or selling shares
of the fund, investors typically will pay brokerage commissions or other charges imposed by financial
intermediaries as determined by that financial intermediary.
|
| Cash Transactions Risk |
Cash Transactions
Risk: Unlike certain ETFs that distribute portfolio securities entirely in-kind, the
fund may effect some or all creations and redemptions using cash, rather than in-kind securities. As
a result, an investment in the fund may be less tax-efficient than an investment in an ETF that distributes
portfolio securities entirely in-kind.
|
|
| MFS Active International ETF
|
Risk Table - MFS Active International ETF
|
Risk [Text Block] |
| Principal Risks |
Principal Risks As with
any exchange-traded fund, the fund may not achieve its objective and/or you could lose money on your
investment in the fund. An investment in the fund is not a bank deposit and is not insured or guaranteed
by the Federal Deposit Insurance Corporation or any other governmental agency. The
principal risks of investing in the fund are:
|
| Risk Lose Money [Member] |
As with
any exchange-traded fund, the fund may not achieve its objective and/or you could lose money on your
investment in the fund.
|
| Risk Not Insured [Member] |
An investment in the fund is not a bank deposit and is not insured or guaranteed
by the Federal Deposit Insurance Corporation or any other governmental agency.
|
| Investment Selection Risk |
Investment Selection Risk:
MFS' investment analysis, its development and use of quantitative models, and
its selection of investments may not produce the intended results and/or can lead to an investment focus
that results in the fund underperforming other funds with similar investment strategies and/or underperforming
the markets in which the fund invests. The quantitative models used by MFS (both proprietary and third-party)
may not produce the intended results for a variety of reasons, including the factors used in the models,
the weight placed on each factor in the models, changes from the market factors' historical trends, changing
sources of market return or market risk, and technical issues in the design, development, implementation,
application, and maintenance of the models (e.g., incomplete, stale, or inaccurate data, human error,
programming or other software issues, coding errors, and technology failures).
|
| Equity Market Risk/Company Risk |
Equity
Market Risk/Company Risk: Equity markets are volatile
and can decline significantly in response to changes in, or investor perceptions of, issuer, market,
economic, industry, political, regulatory, geopolitical, environmental, public health, and other conditions.
These conditions can affect a single issuer or type of security, issuers within a broad market sector,
industry or geographic region, or the equity markets in general. Certain events can have a dramatic
adverse effect on equity markets and may lead to periods of high volatility in an equity market or a
segment of an equity market. The value of an investment held by the fund may decline due to factors
directly related to the issuer.
|
| Growth Company Risk |
Growth Company Risk:
The stocks of growth companies can be more sensitive to the company’s earnings and more volatile than
the market in general.
|
| Value Company Risk |
Value Company Risk: The
stocks of value companies can continue to be undervalued for long periods of time and not realize their
expected value and can be more volatile than the market in general.
|
| Foreign Risk |
Foreign
Risk: Exposure to foreign markets through issuers or currencies can involve additional
risks relating to market, economic, industry, political, regulatory, geopolitical, environmental, public
health, and other conditions. These factors can make foreign investments, especially those tied economically
to emerging markets or countries subject to sanctions or the threat of new or modified sanctions, more
volatile and less liquid than U.S. investments. In addition, foreign markets can react differently to
these conditions than the U.S. market.
|
| Emerging Markets Risk |
Emerging Markets Risk:
Investments tied economically to emerging markets, especially frontier markets, can involve additional
and greater risks than the risks associated with investments in developed markets. Emerging markets
can have less developed markets, greater custody and operational
risk, less developed legal, regulatory, and accounting systems, greater government involvement in the
economy, greater risk of new or inconsistent government treatment of or restrictions on issuers and instruments,
and greater political, social, geopolitical, and economic instability than developed markets.
|
| Currency Risk |
Currency
Risk: The value of foreign currencies relative to the U.S. dollar fluctuates in response
to market, economic, industry, political, regulatory, geopolitical, environmental, public health, and
other conditions, and changes in currency exchange rates impact the financial condition of companies or other issuers and may change the value in
U.S. dollars of investments denominated in foreign currencies.
|
| Focus Risk |
Focus Risk:
Issuers in a single industry, sector, country, or region can react similarly to
market, currency, political, economic, regulatory, geopolitical, environmental, public health, and other
conditions, and the fund's performance will be affected by the conditions in the industries, sectors,
countries, and regions to which the fund is exposed. Furthermore, investments in particular industries,
sectors, countries, or regions may be more volatile than the broader market as a whole.
|
| Liquidity Risk |
Liquidity
Risk: It may be difficult to value, and it may not be possible to
sell, certain investments, types of investments, and/or investments in certain segments of the market,
and the fund may have to sell certain of these investments at prices or times that are not advantageous
in order to meet redemptions or other cash needs.
|
| Fluctuation of Net Asset Value and Share Price Risk |
Fluctuation
of Net Asset Value and Share Price Risk: The net asset value (NAV) per share of the
fund will generally fluctuate with changes in the market value of the fund’s holdings. The fund’s
shares can be bought and sold in the secondary market at market prices. Disruptions to purchases and
sales, the existence of extreme market volatility, and/or a lack of an active trading market for the
fund's shares may result in the fund's shares trading significantly above (at a premium) or below (at
a discount) to NAV and bid/ask spreads may widen. Shares of the fund may trade at a larger premium or
discount to the NAV than shares of other ETFs that focus on other market segments or types of securities.
In addition, in stressed market conditions or periods of market disruption or volatility, the market
for shares of the fund may become less liquid in response to deteriorating liquidity in the markets for
the fund’s underlying portfolio holdings. If you buy fund shares when their market price is at a premium
or sell fund shares when their market prices is at a discount, you may pay more than, or receive less
than, NAV, respectively.
|
| Authorized Participant Risks |
Authorized Participant Risks: Only
financial institutions authorized to transact daily with the fund (Authorized Participants) may engage
in creation or redemption transactions directly with the fund, and Authorized Participants are not obligated
to do so. To the extent an Authorized Participant cannot or is otherwise unwilling to engage in creation
and redemption transactions, and no other Authorized Participant engages in such transactions, shares
of the fund may trade at a significant discount or premium to NAV, experience wider intraday bid/ask
spreads, and may face trading halts and/or delisting from the exchange.
|
| Trading Issues Risk |
Trading
Issues Risk: There can be no assurance that an active trading market for
the fund’s shares will develop or be maintained. In addition, trading of the fund’s shares may be
halted or become less liquid. Shares of the fund, similar to shares of other issuers listed on a stock
exchange, may be sold short and are therefore subject to the risk of increased volatility and price decreases
associated with being sold short. Most fund investors will buy
and sell fund shares on the listing exchange or on another secondary market. When buying or selling shares
of the fund, investors typically will pay brokerage commissions or other charges imposed by financial
intermediaries as determined by that financial intermediary.
|
| Cash Transactions Risk |
Cash Transactions
Risk: Unlike certain ETFs that distribute portfolio securities entirely in-kind, the
fund may effect some or all creations and redemptions using cash, rather than in-kind securities. As
a result, an investment in the fund may be less tax-efficient than an investment in an ETF that distributes
portfolio securities entirely in-kind.
|
|
| MFS Active Mid Cap ETF
|
Risk Table - MFS Active Mid Cap ETF
|
Risk [Text Block] |
| Principal Risks |
Principal
Risks As with any exchange-traded fund, the fund may not achieve
its objective and/or you could lose money on your investment in the fund. An investment in the fund is
not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any
other governmental agency. The principal risks of investing in the fund
are:
|
| Risk Lose Money [Member] |
As with any exchange-traded fund, the fund may not achieve
its objective and/or you could lose money on your investment in the fund.
|
| Risk Not Insured [Member] |
An investment in the fund is
not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any
other governmental agency.
|
| Investment Selection Risk |
Investment Selection Risk: MFS'
investment analysis and its selection of investments may not produce the intended results and/or can
lead to an investment focus that results in the fund underperforming other funds with similar investment
strategies and/or underperforming the markets in which the fund invests. In addition, to the extent
MFS considers quantitative tools in managing the fund, such tools may not produce the intended results.
|
| Equity Market Risk/Company Risk |
Equity Market Risk/Company Risk: Equity
markets are volatile and can decline significantly in response to changes in, or investor perceptions
of, issuer, market, economic, industry, political, regulatory, geopolitical, environmental, public health,
and other conditions. These conditions can affect a single issuer or type of security, issuers within
a broad market sector, industry or geographic region, or the equity markets in general. Certain events
can have a dramatic adverse effect on equity markets and may lead to periods of high volatility in an
equity market or a segment of an equity market. The value of an investment held by the fund may decline
due to factors directly related to the issuer.
|
| Growth Company Risk |
Growth
Company Risk: The stocks of growth companies can be more sensitive to the
company’s earnings and more volatile than the market in general.
|
| Value Company Risk |
Value Company
Risk: The stocks of value companies can continue to be undervalued
for long periods of time and not realize their expected value and can be more volatile than the market
in general.
|
| Mid Cap Risk |
Mid Cap Risk: The
stocks of mid cap companies can be more volatile and their shares can be less liquid than those of larger
companies.
|
| Foreign Risk |
Foreign Risk: Exposure to foreign markets
through issuers or currencies can involve additional risks relating to market, economic, industry, political,
regulatory, geopolitical, environmental, public health, and other conditions. These factors can make
foreign investments, especially those tied economically to countries with developing economies or countries
subject to sanctions or the threat of new or modified sanctions, more volatile and less liquid than U.S.
investments. In addition, foreign markets can react differently to these conditions than the U.S. market.
|
| Focus Risk |
Focus
Risk: Issuers in a single industry, sector, country, or region can react similarly to
market, currency, political, economic, regulatory, geopolitical, environmental, public health, and other
conditions, and the fund's performance will be affected by the conditions in the industries, sectors,
countries, and regions to which the fund is exposed. Furthermore, investments in particular industries,
sectors, countries, or regions may be more volatile than the broader market as a whole.
|
| Leveraging Risk |
Leveraging Risk: Leverage
involves investment exposure in an amount exceeding the initial investment. Leverage can cause increased
volatility by magnifying gains or losses.
|
| Liquidity Risk |
Liquidity
Risk: It may be difficult to value, and it may not be possible to
sell, certain investments, types of investments, and/or investments in certain segments of the market,
and the fund may have to sell certain of these investments at prices or times that are not advantageous
in order to meet redemptions or other cash needs.
|
| Capacity Risk |
Capacity
Risk: The markets and securities in which the fund primarily invests may, at times,
have limited capacity, and as an ETF, the fund cannot be closed to new investors as a means of managing
capacity. During periods of capacity constraints, the implementation and execution of the fund’s strategy,
including the portfolio securities purchased, held, and sold by the fund, may change, and capacity limitations
may negatively impact the performance of the fund.
|
| Fluctuation of Net Asset Value and Share Price Risk |
Fluctuation
of Net Asset Value and Share Price Risk: The net asset value (NAV) per share of the
fund will generally fluctuate with changes in the market value of the fund’s holdings. The fund’s
shares can be bought and sold in the secondary market at market prices. Disruptions to purchases and
sales, the existence of extreme market volatility, and/or a lack of an active trading market for the
fund's shares may result in the fund's shares trading significantly above (at a premium) or below (at
a discount) to NAV and bid/ask spreads may widen. Shares of the fund may trade at a larger premium or
discount to the NAV than shares of other ETFs that focus on other market segments or types of securities.
In addition, in stressed market conditions or periods of market disruption or volatility, the market
for shares of the fund may become less liquid in response to deteriorating liquidity in the markets for
the fund’s underlying portfolio holdings. If you buy fund shares when their market price is at a premium
or sell fund shares when their market prices is at a discount, you may pay more than, or receive less
than, NAV, respectively.
|
| Authorized Participant Risks |
Authorized Participant Risks: Only
financial institutions authorized to transact daily with the fund (Authorized Participants) may engage
in creation or redemption transactions directly with the fund, and Authorized Participants are not obligated
to do so. To the extent an Authorized Participant cannot or is otherwise unwilling to engage in creation
and redemption transactions, and no other Authorized Participant engages in such transactions, shares
of the fund may trade at a significant discount or premium to NAV, experience wider intraday bid/ask
spreads, and may face trading halts and/or delisting from the exchange.
|
| Trading Issues Risk |
Trading
Issues Risk: There can be no assurance that an active trading market for
the fund’s shares will develop or be maintained. In addition, trading of the fund’s shares may be
halted or become less liquid. Shares of the fund, similar to shares of other issuers listed on a stock
exchange, may be sold short and are therefore subject to the risk of increased volatility and price decreases
associated with being sold short. Most fund investors will buy
and sell fund shares on the listing exchange or on another secondary market. When buying or selling shares
of the fund, investors typically will pay brokerage commissions or other charges imposed by financial
intermediaries as determined by that financial intermediary.
|
| Cash Transactions Risk |
Cash Transactions
Risk: Unlike certain ETFs that distribute portfolio securities entirely in-kind, the
fund may effect some or all creations and redemptions using cash, rather than in-kind securities. As
a result, an investment in the fund may be less tax-efficient than an investment in an ETF that distributes
portfolio securities entirely in-kind.
|
|
| MFS Active Value ETF
|
Risk Table - MFS Active Value ETF
|
Risk [Text Block] |
| Principal Risks |
Principal
Risks As with any exchange-traded fund, the fund may not achieve
its objective and/or you could lose money on your investment in the fund. An investment in the fund is
not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any
other governmental agency. The principal risks of investing in the fund
are:
|
| Risk Lose Money [Member] |
As with any exchange-traded fund, the fund may not achieve
its objective and/or you could lose money on your investment in the fund.
|
| Risk Not Insured [Member] |
An investment in the fund is
not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any
other governmental agency.
|
| Investment Selection Risk |
Investment Selection Risk: MFS'
investment analysis and its selection of investments may not produce the intended results and/or can
lead to an investment focus that results in the fund underperforming other funds with similar investment
strategies and/or underperforming the markets in which the fund invests. In addition, to the extent
MFS considers quantitative tools in managing the fund, such tools may not produce the intended results.
|
| Equity Market Risk/Company Risk |
Equity Market Risk/Company Risk: Equity
markets are volatile and can decline significantly in response to changes in, or investor perceptions
of, issuer, market, economic, industry, political, regulatory, geopolitical, environmental, public health,
and other conditions. These conditions can affect a single issuer or type of security, issuers within
a broad market sector, industry or geographic region, or the equity markets in general. Certain events
can have a dramatic adverse effect on equity markets and may lead to periods of high volatility in an
equity market or a segment of an equity market. The value of an investment held by the fund may decline
due to factors directly related to the issuer.
|
| Value Company Risk |
Value Company
Risk: The stocks of value companies can continue to be undervalued
for long periods of time and not realize their expected value and can be more volatile than the market
in general.
|
| Foreign Risk |
Foreign Risk: Exposure
to foreign markets through issuers or currencies can involve additional risks relating to market, economic,
industry, political, regulatory, geopolitical, environmental, public health, and other conditions. These
factors can make foreign investments, especially those tied economically to countries with developing
economies or countries subject to sanctions or the threat of new or modified sanctions, more volatile
and less liquid than U.S. investments. In addition, foreign markets can react differently to these conditions
than the U.S. market.
|
| Focus Risk |
Focus Risk: Issuers
in a single industry, sector, country, or region can react similarly to market, currency, political,
economic, regulatory, geopolitical, environmental, public health, and other conditions, and the fund's
performance will be affected by the conditions in the industries, sectors, countries, and regions to
which the fund is exposed. Furthermore, investments in particular industries, sectors, countries, or
regions may be more volatile than the broader market as a whole.
|
| Liquidity Risk |
Liquidity
Risk: It may be difficult to value, and it may not be possible to
sell, certain investments, types of investments, and/or investments in certain segments of the market,
and the fund may have to sell certain of these investments at prices or times that are not advantageous
in order to meet redemptions or other cash needs.
|
| Fluctuation of Net Asset Value and Share Price Risk |
Fluctuation
of Net Asset Value and Share Price Risk: The net asset value (NAV) per share of the
fund will generally fluctuate with changes in the market value of the fund’s holdings. The fund’s
shares can be bought and sold in the secondary market at market prices. Disruptions to purchases and
sales, the existence of extreme market volatility, and/or a lack of an active trading market for the
fund's shares may result in the fund's shares trading significantly above (at
a premium) or below (at a discount) to NAV and bid/ask spreads may widen. Shares of the fund may trade
at a larger premium or discount to the NAV than shares of other ETFs that focus on other market segments
or types of securities. In addition, in stressed market conditions or periods of market disruption or
volatility, the market for shares of the fund may become less liquid in response to deteriorating liquidity
in the markets for the fund’s underlying portfolio holdings. If you buy fund shares when their market
price is at a premium or sell fund shares when their market prices is at a discount, you may pay more
than, or receive less than, NAV, respectively.
|
| Authorized Participant Risks |
Authorized Participant Risks:
Only financial institutions authorized to transact daily with the fund (Authorized
Participants) may engage in creation or redemption transactions directly with the fund, and Authorized
Participants are not obligated to do so. To the extent an Authorized Participant cannot or is otherwise
unwilling to engage in creation and redemption transactions, and no other Authorized Participant engages
in such transactions, shares of the fund may trade at a significant discount or premium to NAV, experience
wider intraday bid/ask spreads, and may face trading halts and/or delisting from the exchange.
|
| Trading Issues Risk |
Trading
Issues Risk: There can be no assurance that an active trading market for
the fund’s shares will develop or be maintained. In addition, trading of the fund’s shares may be
halted or become less liquid. Shares of the fund, similar to shares of other issuers listed on a stock
exchange, may be sold short and are therefore subject to the risk of increased volatility and price decreases
associated with being sold short. Most fund investors will buy
and sell fund shares on the listing exchange or on another secondary market. When buying or selling shares
of the fund, investors typically will pay brokerage commissions or other charges imposed by financial
intermediaries as determined by that financial intermediary.
|
| Cash Transactions Risk |
Cash Transactions
Risk: Unlike certain ETFs that distribute portfolio securities entirely in-kind, the
fund may effect some or all creations and redemptions using cash, rather than in-kind securities. As
a result, an investment in the fund may be less tax-efficient than an investment in an ETF that distributes
portfolio securities entirely in-kind.
|
|
| MFS Blended Research Core Equity ETF
|
Risk Table - MFS Blended Research Core Equity ETF
|
Risk [Text Block] |
| Principal Risks |
Principal
Risks As with any exchange-traded fund, the fund may not achieve
its objective and/or you could lose money on your investment in the fund. An investment in the fund is
not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any
other governmental agency. The principal risks of investing in the fund
are:
|
| Risk Lose Money [Member] |
As with any exchange-traded fund, the fund may not achieve
its objective and/or you could lose money on your investment in the fund.
|
| Risk Not Insured [Member] |
An investment in the fund is
not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any
other governmental agency.
|
| Investment Selection Risk |
Investment Selection Risk: MFS'
investment analysis, its development and use of quantitative models, and its selection of investments
may not produce the intended results and/or can lead to an investment focus that results in the fund
underperforming other funds with similar investment strategies and/or underperforming the markets in
which the fund invests. The quantitative models used by MFS (both proprietary and third-party) may not
produce the intended results for a variety of reasons, including the factors used in the models, the
weight placed on each factor in the models, changes from the market factors' historical trends, changing
sources of market return or market risk, and technical issues in the design, development, implementation,
application, and maintenance of the models (e.g., incomplete, stale, or inaccurate data, human error,
programming or other software issues, coding errors, and technology failures).
|
| Equity Market Risk/Company Risk |
Equity
Market Risk/Company Risk: Equity markets are volatile
and can decline significantly in response to changes in, or investor perceptions of, issuer, market,
economic, industry, political, regulatory, geopolitical, environmental, public health, and other conditions.
These conditions can affect a single issuer or type of security, issuers within a broad market sector,
industry or geographic region, or the equity markets in general. Certain events can have a dramatic
adverse effect on equity markets and may lead to periods of high volatility in an equity market or a
segment of an equity market. The value of an investment held by the fund may decline due to factors
directly related to the issuer.
|
| Growth Company Risk |
Growth Company Risk:
The stocks of growth companies can be more sensitive to the company’s earnings and more volatile than
the market in general.
|
| Value Company Risk |
Value Company Risk: The
stocks of value companies can continue to be undervalued for long periods of time and not realize their expected value and can be more volatile than the market in general.
|
| Investment Strategy Risk |
Investment
Strategy Risk: There is no assurance that the fund's predicted tracking
error will equal its target predicted tracking error at any point in time or consistently for any period
of time, or that the fund's predicted tracking error and actual tracking error will be similar. The
fund's strategy to target a predicted tracking error of approximately 2% compared to the Standard &
Poor's 500 Stock Index and to blend fundamental and quantitative research may not produce the intended
results. In addition, MFS' fundamental research is not available for all issuers.
|
| Foreign Risk |
Foreign
Risk: Exposure to foreign markets through issuers or currencies can involve additional
risks relating to market, economic, industry, political, regulatory, geopolitical, environmental, public
health, and other conditions. These factors can make foreign investments, especially those tied economically
to countries with developing economies or countries subject to sanctions or the threat of new or modified
sanctions, more volatile and less liquid than U.S. investments. In addition, foreign markets can react
differently to these conditions than the U.S. market.
|
| Focus Risk |
Focus Risk:
Issuers in a single industry, sector, country, or region can react similarly to
market, currency, political, economic, regulatory, geopolitical, environmental, public health, and other
conditions, and the fund's performance will be affected by the conditions in the industries, sectors,
countries, and regions to which the fund is exposed. Furthermore, investments in particular industries,
sectors, countries, or regions may be more volatile than the broader market as a whole. If MFS invests a significant percentage of the fund's assets in a single issuer
or small number of issuers, the fund’s performance could be more volatile than the performance of more
diversified funds.
|
| Liquidity Risk |
Liquidity Risk: It
may be difficult to value, and it may not be possible to sell, certain investments, types of investments,
and/or investments in certain segments of the market, and the fund may have to sell certain of these
investments at prices or times that are not advantageous in order to meet redemptions or other cash needs.
|
| Fluctuation of Net Asset Value and Share Price Risk |
Fluctuation of Net Asset Value and Share Price Risk:
The net asset value (NAV) per share of the fund will generally fluctuate with changes in the market value
of the fund’s holdings. The fund’s shares can be bought and sold in the secondary market at market
prices. Disruptions to purchases and sales, the existence of extreme market volatility, and/or a lack
of an active trading market for the fund's shares may result in the fund's shares trading significantly
above (at a premium) or below (at a discount) to NAV and bid/ask spreads may widen. Shares of the fund
may trade at a larger premium or discount to the NAV than shares of other ETFs that focus on other market
segments or types of securities. In addition, in stressed market conditions or periods of market disruption
or volatility, the market for shares of the fund may become less liquid in response to deteriorating
liquidity in the markets for the fund’s underlying portfolio holdings. If you buy fund shares when
their market price is at a premium or sell fund shares when their market prices is at a discount, you
may pay more than, or receive less than, NAV, respectively.
|
| Authorized Participant Risks |
Authorized
Participant Risks: Only financial institutions authorized to transact daily with
the fund (Authorized Participants) may engage in creation or redemption transactions directly with the
fund, and Authorized Participants are not obligated to do so. To the extent an Authorized Participant
cannot or is otherwise unwilling to engage in creation and redemption transactions, and no other Authorized
Participant engages in such transactions, shares of the fund may trade at a significant discount or premium
to NAV, experience wider intraday bid/ask spreads, and may face trading halts and/or delisting from the
exchange.
|
| Trading Issues Risk |
Trading Issues Risk: There can be no assurance
that an active trading market for the fund’s shares will develop or be maintained. In addition, trading
of the fund’s shares may be halted or become less liquid. Shares of the fund, similar to shares of
other issuers listed on a stock exchange, may be sold short and are therefore subject to the risk of
increased volatility and price decreases associated with being sold short. Most
fund investors will buy and sell fund shares on the listing exchange or on another secondary market.
When buying or selling shares of the fund, investors typically will pay brokerage commissions or other
charges imposed by financial intermediaries as determined by that financial intermediary.
|
| Cash Transactions Risk |
Cash Transactions
Risk: Unlike certain ETFs that distribute portfolio securities entirely in-kind, the
fund may effect some or all creations and redemptions using cash, rather than in-kind securities. As
a result, an investment in the fund may be less tax-efficient than an investment in an ETF that distributes
portfolio securities entirely in-kind.
|
|
| MFS Blended Research Emerging Markets Equity ETF
|
Risk Table - MFS Blended Research Emerging Markets Equity ETF
|
Risk [Text Block] |
| Principal Risks |
Principal Risks As with
any exchange-traded fund, the fund may not achieve its objective and/or you could lose money on your
investment in the fund. An investment in the fund is not a bank deposit and is not insured or guaranteed
by the Federal Deposit Insurance Corporation or any other governmental agency. The
principal risks of investing in the fund are:
|
| Risk Lose Money [Member] |
As with
any exchange-traded fund, the fund may not achieve its objective and/or you could lose money on your
investment in the fund.
|
| Risk Not Insured [Member] |
An investment in the fund is not a bank deposit and is not insured or guaranteed
by the Federal Deposit Insurance Corporation or any other governmental agency.
|
| Investment Selection Risk |
Investment Selection Risk:
MFS' investment analysis, its development and use of quantitative models, and
its selection of investments may not produce the intended results and/or can lead to an investment focus
that results in the fund underperforming other funds with similar investment strategies and/or underperforming
the markets in which the fund invests. The quantitative models used by MFS (both proprietary and third-party)
may not produce the intended results for a variety of reasons, including the factors used in the models,
the weight placed on each factor in the models, changes from the market factors' historical trends, changing
sources of market return or market risk, and technical issues in the design, development, implementation,
application, and maintenance of the models (e.g., incomplete, stale, or inaccurate data, human error,
programming or other software issues, coding errors, and technology failures).
|
| Equity Market Risk/Company Risk |
Equity
Market Risk/Company Risk: Equity markets are volatile
and can decline significantly in response to changes in, or investor perceptions of, issuer, market,
economic, industry, political, regulatory, geopolitical, environmental, public health, and other conditions.
These conditions can affect a single issuer or type of security, issuers within a broad market sector,
industry or geographic region, or the equity markets in general. Certain events can have a dramatic
adverse effect on equity markets and may lead to periods of high volatility in an equity market or a
segment of an equity market. The value of an investment held by the fund may decline due to factors
directly related to the issuer.
|
| Investment Strategy Risk |
Investment Strategy Risk:
There is no assurance that the fund's predicted tracking error will equal its
target predicted tracking error at any point in time or consistently for any period of time, or that
the fund's predicted tracking error and actual tracking error will be similar. The fund's strategy to
target a predicted tracking error of approximately 2% compared to the MSCI Emerging Markets Index and to blend fundamental
and quantitative research may not produce the intended results. In addition, MFS' fundamental research
is not available for all issuers.
|
| Foreign Risk |
Foreign Risk:
Exposure to foreign markets through issuers or currencies can involve additional risks relating to market,
economic, industry, political, regulatory, geopolitical, environmental, public health, and other conditions.
These factors can make foreign investments, especially those tied economically to emerging markets or
countries subject to sanctions or the threat of new or modified sanctions, more volatile and less liquid
than U.S. investments. In addition, foreign markets can react differently to these conditions than the
U.S. market.
|
| Emerging Markets Risk |
Emerging Markets Risk: Investments
tied economically to emerging markets, especially frontier markets, can involve additional and greater
risks than the risks associated with investments in developed markets. Emerging markets can have less
developed markets, greater custody and operational
risk, less developed legal, regulatory, and accounting systems, greater government involvement in the
economy, greater risk of new or inconsistent government treatment of or restrictions on issuers and instruments,
and greater political, social, geopolitical, and economic instability than developed markets.
|
| Currency Risk |
Currency
Risk: The value of foreign currencies relative to the U.S. dollar fluctuates in response
to market, economic, industry, political, regulatory, geopolitical, environmental, public health, and
other conditions, and changes in currency exchange rates impact the financial condition of companies
or other issuers and may change the value in U.S. dollars of investments denominated in foreign currencies.
|
| Focus Risk |
Focus Risk: Issuers in a single industry,
sector, country, or region can react similarly to market, currency, political, economic, regulatory,
geopolitical, environmental, public health, and other conditions, and the fund's performance will be
affected by the conditions in the industries, sectors, countries, and regions to which the fund is exposed.
Furthermore, investments in particular industries, sectors, countries, or regions may be more volatile
than the broader market as a whole.
|
| Liquidity Risk |
Liquidity Risk:
It may be difficult to value, and it may not be possible to sell, certain investments,
types of investments, and/or investments in certain segments of the market, and the fund may have to
sell certain of these investments at prices or times that are not advantageous in order to meet redemptions
or other cash needs.
|
| Capacity Risk |
Capacity Risk: The
markets and securities in which the fund primarily invests may, at times, have limited capacity, and
as an ETF, the fund cannot be closed to new investors as a means of managing capacity. During periods
of capacity constraints, the implementation and execution of the fund’s strategy, including the portfolio
securities purchased, held, and sold by the fund, may change, and capacity limitations may negatively
impact the performance of the fund.
|
| Fluctuation of Net Asset Value and Share Price Risk |
Fluctuation of Net Asset Value
and Share Price Risk: The net asset value (NAV) per share of the fund will generally
fluctuate with changes in the market value of the fund’s holdings. The fund’s shares can be bought
and sold in the secondary market at market prices. Disruptions to purchases and sales, the existence
of extreme market volatility, and/or a lack of an active trading market for the fund's shares may result
in the fund's shares trading significantly above (at a premium) or below (at a discount) to NAV and bid/ask
spreads may widen. Shares of the fund may trade at a larger premium or discount to the NAV than shares
of other ETFs that focus on other market segments or types of securities. In addition, in stressed market
conditions or periods of market disruption or volatility, the market for shares of the fund may become
less liquid in response to deteriorating liquidity in the markets for the fund’s underlying portfolio
holdings. If you buy fund shares when their market price is at a premium or sell fund shares when their
market prices is at a discount, you may pay more than, or receive less than, NAV, respectively.
|
| Authorized Participant Risks |
Authorized
Participant Risks: Only financial institutions authorized to transact daily with
the fund (Authorized Participants) may engage in creation or redemption transactions directly with the
fund, and Authorized Participants are not obligated to do so. To the extent an Authorized Participant
cannot or is otherwise unwilling to engage in creation and redemption transactions, and no other Authorized
Participant engages in such transactions, shares of the fund may trade at a significant discount or premium
to NAV, experience wider intraday bid/ask spreads, and may face trading halts and/or delisting from the
exchange.
|
| Trading Issues Risk |
Trading Issues Risk: There can be no assurance
that an active trading market for the fund’s shares will develop or be maintained. In addition, trading
of the fund’s shares may be halted or become less liquid. Shares of the fund, similar to shares of
other issuers listed on a stock exchange, may be sold short and are therefore subject to the risk of
increased volatility and price decreases associated with being sold short. Most
fund investors will buy and sell fund shares on the listing exchange or on another secondary market.
When buying or selling shares of the fund, investors typically will pay brokerage commissions or other
charges imposed by financial intermediaries as determined by that financial intermediary.
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| Cash Transactions Risk |
Cash Transactions
Risk: Unlike certain ETFs that distribute portfolio securities entirely in-kind, the
fund may effect some or all creations and redemptions using cash, rather than in-kind securities. As
a result, an investment in the fund may be less tax-efficient than an investment in an ETF that distributes
portfolio securities entirely in-kind.
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| MFS Blended Research International Equity ETF
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Risk Table - MFS Blended Research International Equity ETF
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Risk [Text Block] |
| Principal Risks |
Principal
Risks As with any exchange-traded fund, the fund may not achieve
its objective and/or you could lose money on your investment in the fund. An investment in the fund is
not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any
other governmental agency. The principal risks of investing in the fund
are:
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| Risk Lose Money [Member] |
As with any exchange-traded fund, the fund may not achieve
its objective and/or you could lose money on your investment in the fund.
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| Risk Not Insured [Member] |
An investment in the fund is
not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any
other governmental agency.
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| Investment Selection Risk |
Investment Selection Risk: MFS'
investment analysis, its development and use of quantitative models, and its selection of investments
may not produce the intended results and/or can lead to an investment focus that results in the fund
underperforming other funds with similar investment strategies and/or underperforming the markets in
which the fund invests. The quantitative models used by MFS (both proprietary and third-party) may not
produce the intended results for a variety of reasons, including the factors used in the models, the
weight placed on each factor in the models, changes from the market factors' historical trends, changing
sources of market return or market risk, and technical issues in the design, development, implementation,
application, and maintenance of the models (e.g., incomplete, stale, or inaccurate data, human error,
programming or other software issues, coding errors, and technology failures).
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| Equity Market Risk/Company Risk |
Equity
Market Risk/Company Risk: Equity markets are volatile
and can decline significantly in response to changes in, or investor perceptions of, issuer, market,
economic, industry, political, regulatory, geopolitical, environmental, public health, and other conditions.
These conditions can affect a single issuer or type of security, issuers within a broad market sector,
industry or geographic region, or the equity markets in general. Certain events can have a dramatic
adverse effect on equity markets and may lead to periods of high volatility in an equity market or a
segment of an equity market. The value of an investment held by the fund may decline due to factors
directly related to the issuer.
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| Growth Company Risk |
Growth
Company Risk: The stocks of growth companies can be more sensitive to the
company’s earnings and more volatile than the market in general.
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| Value Company Risk |
Value Company
Risk: The stocks of value companies can continue to be undervalued
for long periods of time and not realize their expected value and can be more volatile than the market
in general.
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| Investment Strategy Risk |
Investment Strategy Risk: There
is no assurance that the fund's predicted tracking error will equal its target predicted tracking error
at any point in time or consistently for any period of time, or that the fund's predicted tracking error
and actual tracking error will be similar. The fund's strategy to target a predicted tracking error
of approximately 2% compared to the MSCI All Country World (ex-US) Index and to blend fundamental and
quantitative research may not produce the intended results. In addition, MFS' fundamental research is
not available for all issuers.
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| Foreign Risk |
Foreign Risk:
Exposure to foreign markets through issuers or currencies can involve additional risks relating to market,
economic, industry, political, regulatory, geopolitical, environmental, public health, and other conditions.
These factors can make foreign investments, especially those tied economically to emerging markets or
countries subject to sanctions or the threat of new or modified sanctions, more volatile and less liquid
than U.S. investments. In addition, foreign markets can react differently to these conditions than the
U.S. market.
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| Emerging Markets Risk |
Emerging Markets Risk: Investments
tied economically to emerging markets, especially frontier markets, can involve additional and greater
risks than the risks associated with investments in developed markets. Emerging markets can have less
developed markets, greater custody and operational
risk, less developed legal, regulatory, and accounting systems, greater government involvement in the
economy, greater risk of new or inconsistent government treatment of or restrictions on issuers and instruments,
and greater political, social, geopolitical, and economic instability than developed markets.
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| Currency Risk |
Currency
Risk: The value of foreign currencies relative to the U.S. dollar fluctuates in response
to market, economic, industry, political, regulatory, geopolitical, environmental, public health, and
other conditions, and changes in currency exchange rates impact the financial condition of companies
or other issuers and may change the value in U.S. dollars of investments denominated in foreign currencies.
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| Focus Risk |
Focus Risk: Issuers in a single industry,
sector, country, or region can react similarly to market, currency, political, economic, regulatory,
geopolitical, environmental, public health, and other conditions, and the fund's performance will be
affected by the conditions in the industries, sectors, countries, and regions to which the fund is exposed.
Furthermore, investments in particular industries, sectors, countries, or regions may be more volatile
than the broader market as a whole.
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| Liquidity Risk |
Liquidity Risk:
It may be difficult to value, and it may not be possible to sell, certain investments,
types of investments, and/or investments in certain segments of the market, and the fund may have to
sell certain of these investments at prices or times that are not advantageous in order to meet redemptions
or other cash needs.
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| Fluctuation of Net Asset Value and Share Price Risk |
Fluctuation of Net Asset Value and Share Price
Risk: The net asset value (NAV) per share of the fund will generally fluctuate with
changes in the market value of the fund’s holdings. The fund’s shares can be bought and sold in
the secondary market at market prices. Disruptions to purchases and sales, the existence of extreme
market volatility, and/or a lack of an active trading market for the fund's shares may result in the
fund's shares trading significantly above (at a premium) or below (at a discount) to NAV and bid/ask
spreads may widen. Shares of the fund may trade at a larger premium or discount to the NAV than shares
of other ETFs that focus on other market segments or types of securities. In addition, in stressed market
conditions or periods of market disruption or volatility, the market for shares of the fund may become
less liquid in response to deteriorating liquidity in the markets for the fund’s underlying portfolio
holdings. If you buy fund shares when their market price is at a premium or sell fund shares when their
market prices is at a discount, you may pay more than, or receive less than, NAV, respectively.
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| Authorized Participant Risks |
Authorized
Participant Risks: Only financial institutions authorized to transact daily with
the fund (Authorized Participants) may engage in creation or redemption transactions directly with the
fund, and Authorized Participants are not obligated to do so. To the extent an Authorized Participant
cannot or is otherwise unwilling to engage in creation and redemption transactions, and no other Authorized
Participant engages in such transactions, shares of the fund may trade at a significant discount or premium
to NAV, experience wider intraday bid/ask spreads, and may face trading halts and/or delisting from the
exchange.
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| Trading Issues Risk |
Trading Issues Risk: There can be no assurance
that an active trading market for the fund’s shares will develop or be maintained. In addition, trading
of the fund’s shares may be halted or become less liquid. Shares of the fund, similar to shares of
other issuers listed on a stock exchange, may be sold short and are therefore subject to the risk of
increased volatility and price decreases associated with being sold short. Most
fund investors will buy and sell fund shares on the listing exchange or on another secondary market.
When buying or selling shares of the fund, investors typically will pay brokerage commissions or other
charges imposed by financial intermediaries as determined by that financial intermediary.
|
| Cash Transactions Risk |
Cash Transactions
Risk: Unlike certain ETFs that distribute portfolio securities entirely in-kind, the
fund may effect some or all creations and redemptions using cash, rather than in-kind securities. As
a result, an investment in the fund may be less tax-efficient than an investment in an ETF that distributes
portfolio securities entirely in-kind.
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