STF Tactical Growth ETF (TUG) Listed on The NASDAQ Stock Market LLC Summary Prospectus May 16, 2022 www.stfm.com

Before you invest, you may want to review the Fund’s prospectus and statement of additional information (“SAI”), which contain more information about the Fund and its risks. The current prospectus and SAI dated May 16, 2022, are incorporated by reference into this Summary Prospectus. You can find the Fund’s prospectus, reports to shareholders, and other information about the Fund online at www.stfm.com. You can also get this information at no cost by calling 1-866-590-9112 or by sending an e-mail request to ETF@usbank.com.

Investment Objective

The STF Tactical Growth ETF (the “Fund” or “Growth ETF”) seeks long-term growth of capital.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund (“Shares”). You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and Example below.

Shareholder Fees (fees paid directly from your investment)	None
Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Management Fee	0.65%
Distribution and/or Service (12b-1) Fees	0.00%
Other Expenses*	0.00%
Total Annual Fund Operating Expenses	0.65%

* Estimated for the current fiscal year.

Example

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your Shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The Example does not take into account brokerage commissions that you may pay on your purchases and sales of Shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 Year: $66 3 Years: $208

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Shares are held in a taxable account. These costs, which are not reflected in the Total Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. Because the Fund is newly organized, portfolio turnover information is not yet available.

Principal Investment Strategies

The Fund is an actively-managed exchange-traded fund (“ETF”) that seeks to achieve its investment objective by allocating its investments among a combination of (i) U.S. equity securities or ETFs that, in the aggregate, seek to replicate the Nasdaq-100® Index (the “Index Allocation”), (ii) directly in, or in ETFs that hold, long-duration U.S. Treasury securities (the “Fixed Income Allocation”), and (iii) short-term U.S. Treasury bills, money market funds, and cash and/or cash equivalents (the “Cash Equivalents”).

In making investment decisions for the Fund, STF Management LP (the “Adviser”), the Fund’s investment adviser, utilizes a proprietary, tactical unconstrained growth model (the “TUG Model”). The TUG Model combines both quantitative and qualitative analysis factors, but is primarily quantitative in nature. The quantitative factors underlying the TUG model include, but are not

1

limited to, asset class (i.e., equity and fixed income) and market volatility, as well as rates of change in both asset class price action (i.e., the price movement of securities in a particular asset class over time) and market volatility. The TUG Model is based on signals that are derived from a proprietary algorithm that tracks market price action across equities, fixed income, and commodities, to include rates of change in correlation and volatility. In response to shifts in price action, market volatility, and correlation of the two primary asset classes based on the TUG Model, the Adviser will adjust the Fund’s portfolio allocations between the Index Allocation and the Fixed Income Allocation and thereby seek to proactively adapt to current market conditions.

The TUG Model provides the opportunity to take advantage of both equity bull and bear markets through the use of strategic long equity positions in addition to long Treasury and money market positions. In seeking to capitalize upon the noncorrelation between equities and fixed income securities, the TUG Model will assess which asset class provides the best opportunity for growth in light of prevailing market conditions. For example, when the equity markets become indecisive, the TUG Model seeks to both protect and benefit the Fund from the periodic reversals in equities by allocating assets to bond and/or Cash Equivalents positions.

The TUG Model monitors several moving averages of various lengths to measure underlying trends within the Nasdaq-100® Index. Multiple buy and sell signals are incorporated into the TUG Model to take advantage of evolving market conditions. As a result, the TUG Model generates unique signals in both bullish and bearish markets, as the market tends to behave differently depending on the trend. A partial allocation (long or short) to Treasury bonds may be made when the equity signal is not at full strength.

The Fund may engage in active and frequent trading of portfolio securities in implementing its principal investment strategies.

The Fund is considered to be non-diversified, which means that it may invest more of its assets in the securities of a single issuer or a smaller number of issuers than if it were a diversified fund.

Principal Investment Risks

The principal risks of investing in the Fund are summarized below. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with those of other funds. Each risk summarized below is considered a “principal risk” of investing in the Fund, regardless of the order in which it appears. As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund. Some or all of these risks may adversely affect the Fund’s net asset value (“NAV”), trading price, yield, total return and/or ability to meet its objective. The following risks could affect the value of your investment in the Fund:

•Cybersecurity Risk. Cybersecurity incidents may allow an unauthorized party to gain access to Fund assets or proprietary information, or cause the Fund, the Adviser, and/or other service providers (including custodians and financial intermediaries) to suffer data breaches or data corruption. Additionally, cybersecurity failures or breaches of the electronic systems of the Fund, the Adviser, or the Fund’s other service providers, market makers, Authorized Participants (“APs”) or the issuers of securities in which the Fund invests have the ability to cause disruptions and negatively impact the Fund's business operations, potentially resulting in financial losses to the Fund and its shareholders.

•Equity Market Risk. The trading prices of equity securities and other instruments fluctuate in response to a variety of factors. The Fund’s NAV and market price may fluctuate significantly in response to these and other factors. As a result, an investor could lose money over short or long periods of time.

•ETF Risks. The Fund is an ETF, and, as a result of its structure, it is exposed to the following risks:

◦Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as APs. In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

◦Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid/ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments.

◦Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant.

2

◦Trading.Although Shares are listed for trading on The NASDAQ Stock Market LLC (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares.

•Fixed Income Risk. Current market conditions and the actions of governmental authorities and regulators in response to COVID-19 and its far-reaching effects present heightened risks to the fixed income market generally. Such risks could be further heightened if such market conditions become more volatile or the governmental and regulatory actions are unexpectedly or suddenly reversed or are ineffective in achieving their desired outcomes. In addition, the current environment is exposing fixed-income and debt markets to significant volatility and reduced liquidity for Fund investments.

◦Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Fund may “call” or repay the security before its stated maturity, and the Fund may have to reinvest the proceeds at lower interest rates, resulting in a decline in the Fund’s income.

◦Credit Risk. Debt issuers and other counterparties may not honor their obligations or may have their debt downgraded by ratings agencies.

◦Extension Risk. During periods of rising interest rates, certain debt obligations will be paid off substantially more slowly than originally anticipated and the value of those securities may fall sharply, resulting in a decline in the Fund’s income and potentially in the value of the Fund’s investments.

◦Interest Rate Risk. An increase in interest rates may cause the value of fixed-income securities held by the Fund to decline. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates and the effect of potential government fiscal policy initiatives and resulting market reaction to those initiatives.

•Management Risk. The Fund is actively managed and may not meet its investment objective based on the Adviser’s success or failure in implementing the Fund’s investment strategies.

•Market Capitalization Risk.

◦Large-Capitalization Investing. The securities of large-capitalization companies may be relatively mature compared to smaller companies and therefore subject to slower growth during times of economic expansion. Large-capitalization companies may also be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes.

•Market Risk. The trading prices of securities and other instruments fluctuate in response to a variety of factors. These factors include events impacting the entire market or specific market segments, such as political, market and economic developments, as well as events that impact specific issuers. The Fund’s NAV and market price, like security and commodity prices generally, may fluctuate significantly in response to these and other factors. As a result, an investor could lose money over short or long periods of time. U.S. and international markets have experienced significant periods of volatility in recent years due to a number of these factors, including the impact of the COVID-19 pandemic and related public health issues, growth concerns in the U.S. and overseas, uncertainties regarding interest rates, trade tensions and the threat of tariffs imposed by the U.S. and other countries. In addition, local, regional or global events such as war, including Russia’s invasion of Ukraine, acts of terrorism, spread of infectious diseases or other public health issues, recessions, rising inflation, or other events could have a significant negative impact on the Fund and its investments. These developments as well as other events could result in further market volatility and negatively affect financial asset prices, the liquidity of certain securities and the normal operations of securities exchanges and other markets. It is unknown how long circumstances related to the pandemic will persist, whether they will reoccur in the future, whether efforts to support the economy and financial markets will be successful, and what additional implications may follow from the pandemic. The impact of these events and other epidemics or pandemics in the future could adversely affect Fund performance.

•Models and Data Risk. When models and data prove to be incorrect or incomplete, any decisions made in reliance thereon expose the Fund to potential risks. Because predictive models are usually constructed based on historical data supplied by third parties, the success of relying on such models may depend heavily on the accuracy and reliability of the supplied historical data.

•New Fund Risk. The Fund is a recently organized investment company with no operating history. As a result, prospective investors have no track record or history on which to base their investment decision. Additionally, the Adviser has not previously managed a registered fund, which may increase the risk of investing in the Fund.

•Non-Diversification Risk. Because the Fund is “non-diversified,” it may invest a greater percentage of its assets in the securities of a single issuer or a lesser number of issuers than if it was a diversified fund. As a result, the Fund may be more exposed to the risks associated with and developments affecting an individual issuer or a lesser number of issuers than a fund

3

that invests more widely. This may increase the Fund’s volatility and cause the performance of a relatively small number of issuers to have a greater impact on the Fund’s performance.

•Other Investment Company Risk. The risks of investment in other investment companies, including ETFs, typically reflect the risks of the types of instruments in which the investment companies invest. By investing in another investment company, the Fund becomes a shareholder of that investment company and bears its proportionate share of the fees and expenses of the other investment company. Investments in ETFs are also subject to the “ETF Risks” described above.

•Portfolio Turnover Risk. Because the Fund may “turn over” some or all of its portfolio frequently, the Fund may incur high levels of transaction costs from commissions or mark-ups in the bid/offer spread. Higher portfolio turnover (e.g., in excess of 100% per year) may result in the Fund paying higher levels of transaction costs and generating greater tax liabilities for shareholders.

•U.S. Treasury Obligations Risk. U.S. Treasury obligations may differ from other fixed income securities in their interest rates, maturities, times of issuance and other characteristics. Similar to other issuers, changes to the financial condition or credit rating of the U.S. government may cause the value of the Fund’s U.S. Treasury obligations to decline.

Performance

The Fund is new and therefore does not have a performance history for a full calendar year. In the future, performance information for the Fund will be presented in this section. Updated performance information is available on the Fund’s website at www.stfm.com.

Management

Investment Adviser:	STF Management LP
Portfolio Managers:	Jonathan Molchan and Thomas Campbell have been portfolio managers of the Fund since its inception in May 2022

Purchase and Sale of Shares

The Fund issues and redeems Shares at NAV only in large blocks known as “Creation Units,” which only APs (typically, broker-dealers) may purchase or redeem. The Fund generally issues and redeems Creation Units in exchange for a portfolio of securities and/or a designated amount of U.S. cash.

Shares are listed on the Exchange, and individual Shares may only be bought and sold in the secondary market through a broker or dealer at market prices, rather than NAV. Because Shares trade at market prices rather than NAV, Shares may trade at a price greater than NAV (premium) or less than NAV (discount).

An investor may incur costs attributable to the difference between the highest price a buyer is willing to pay to purchase Shares (the “bid” price) and the lowest price a seller is willing to accept for Shares (the “ask” price) when buying or selling Shares in the secondary market. The difference in the bid and ask prices is referred to as the “bid-ask spread.”

Recent information regarding the Fund’s NAV, market price, how often Shares traded on the Exchange at a premium or discount, and bid-ask spreads can be found on the Fund’s website at www.stfm.com.

Tax Information

The Fund’s distributions are generally taxable as ordinary income, qualified dividend income, or capital gains (or a combination), unless your investment is in an individual retirement account (“IRA”) or other tax-advantaged account. Distributions on investments made through tax-deferred arrangements may be taxed later upon withdrawal of assets from those accounts.

Financial Intermediary Compensation

If you purchase Shares through a broker-dealer or other financial intermediary (such as a bank) (an “Intermediary”), the Adviser or its affiliates may pay Intermediaries for certain activities related to the Fund, including participation in activities that are designed to make Intermediaries more knowledgeable about exchange-traded products, including the Fund, or for other activities, such as marketing, educational training or other initiatives related to the sale or promotion of Shares. These payments may create a conflict of interest by influencing the Intermediary and your salesperson to recommend the Fund over another investment. Any such arrangements do not result in increased Fund expenses. Ask your salesperson or visit the Intermediary’s website for more information.

4