Investment Objective

Tortoise Energy Infrastructure Total Return Fund, a series of Tortoise Capital Series Trust (the “Fund”), seeks total return.

Fees and Expenses of the Fund

This table describes the fees and expenses you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in A Class shares of funds in the Tortoise fund family. Sales loads and waivers may vary by financial intermediary. For more information on specific financial intermediary sales loads and waivers, see Appendix A to the statutory Prospectus. More information about these and other discounts is available from your financial professional and in the “Shareholder Information — Class Descriptions” section of the Fund’s Statutory Prospectus on page 41.

(1)    No sales charge is payable at the time of purchase on investments of $1 million or more, although the Fund may impose a Contingent Deferred Sales Charge (“CDSC”) of 1.00% on certain redemptions. If imposed, the CDSC applies to redemptions made within 12 months of purchase and will be assessed on an amount equal to the lesser of the initial value of the shares redeemed and the value of shares redeemed at the time of redemption.

(2)    The CDSC applies to redemptions made within 12 months of purchase and will be assessed on an amount equal to the lesser of the initial investment of the shares redeemed and the value of the shares redeemed at the time of redemption.

(3)    Because the Fund is new, “Other Expenses” are based on estimated amounts 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. You may be required to pay brokerage commissions on your purchases and sales of Institutional Class shares of the Fund from a financial intermediary, which are not reflected in the example.

Although your costs may be higher or lower, based on these assumptions your costs would be:

You would pay the following expenses if you did not redeem your shares:

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 may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance. Because the Fund is newly offered, portfolio turnover information is not available. During the most recent fiscal year ended November 30, 2024, the Predecessor Fund’s (defined hereinafter) portfolio turnover rate was 22%.

Principal Investment Strategies

The Fund is a non-diversified series of Tortoise Capital Series Trust and is regulated as an “investment company” under the Investment Company Act of 1940, as amended (the “1940 Act”). The Fund is actively managed and does not seek to track the performance of an index. The Fund’s investment objective to seek total return is non-fundamental.

Under normal circumstances, the Fund will invest at least 80% of its net assets plus the amount of any borrowings for investment purposes in securities of energy infrastructure companies. Energy infrastructure companies are companies that process, store, transport and market natural gas, natural gas liquids, refined products and crude oil (i.e., midstream infrastructure) as well as generate, transport and distribute electricity (i.e., power & renewable infrastructure). The Fund intends to focus its investments primarily in equity securities of midstream infrastructure and also may invest in midstream master limited partnerships (“MLPs”) and power and renewable infrastructure. MLPs, also known as publicly traded partnerships, predominately operate, or directly or indirectly own, energy-related assets. For purposes of this strategy, energy infrastructure companies include investment companies that invest primarily in energy infrastructure companies. The Fund is non-diversified.

The Fund seeks to achieve its investment objective by investing primarily in equity securities of any market capitalization that are publicly traded on an exchange or in the over-the-counter market, consisting of common stock, but also including, among others, MLP and limited liability company (“LLC”) common units; the equity securities issued by MLP affiliates, such as common shares of corporations that own, directly or indirectly, MLP general partner interests; and other investment companies that invest in energy infrastructure companies.

MLP common units represent an equity ownership interest in an MLP. Some energy infrastructure companies in which the Fund may invest are organized as LLCs which are treated in the same manner as MLPs for federal income tax purposes. The Fund may invest in LLC common units which represent an ownership interest in the LLC. Interests in MLP and LLC common units entitle the holder to a share of the company’s success through distributions and/or capital appreciation.

Pursuant to tax regulations, the Fund may invest no more than 25% of its total assets in the securities of MLPs and other entities treated as qualified publicly traded partnerships.

In addition, the Fund may invest in preferred equity, and convertible securities.

Under normal circumstances, the Fund may invest up to: (i) 30% of its total assets in securities denominated in the currency of a non-North American country, which may include securities issued by energy companies organized and/or having securities traded on an exchange outside North America and/or securities of other non-North American companies that are denominated in the currency of a non-North American country; (ii) 20% of its total assets in debt securities of any issuer, including securities which may be rated below investment grade (“junk bonds”) by a nationally recognized statistical rating organization (“NRSRO”) or judged by Tortoise Capital Advisors, L.L.C., also doing business as TCA Advisors (“TCA Advisors” or the “Adviser”), to be of comparable credit quality; (iii) 15% of its net assets in illiquid investments; and (iv) 10% of its total assets in securities of any issuer. The Fund may invest in initial public offerings (“IPOs”). The Fund may invest in other investment companies to the extent permitted by the 1940 Act. The Fund may invest in permissible securities without regard to the market capitalization of the issuer of such security. The Fund will not have any duration or weighted average maturity restrictions.

Except for investments in illiquid investments, the above investment restrictions apply at the time of purchase, and the Fund will not be required to reduce a position due solely to market value fluctuations in order to comply with these restrictions. To the extent that market value fluctuations cause illiquid investments held by the Fund to exceed 15% of its net assets, the Fund will determine how to remediate the excess illiquid investments in accordance with the 1940 Act and the Fund’s policies and procedures.

Tortoise Capital Advisors, L.L.C. also doing business as TCA Advisors, (“TCA Advisors” or the “Adviser”) seeks to invest the Fund in securities that offer a combination of yield, growth and quality, intended to result in attractive long-term total returns. The Adviser’s securities selection process includes a comparison of quantitative, qualitative and relative value factors. Primary emphasis will be placed on proprietary models constructed and maintained by the Adviser’s in-house investment team, although the Adviser may use research provided by broker-dealers and investment firms. To determine whether a company meets its criteria, the Adviser will generally look for long-lived energy infrastructure companies with essential assets with long economic lives (generally 20 years or more), high barriers to entry, total return potential, predictable revenue and stable operating structures, and experienced, operations-focused management teams.

Principal Risks

Risk is inherent in all investing, and you could lose money by investing in the Fund. A summary description of certain principal risks of investing in the Fund is set forth below. Before you decide whether to invest in the Fund, carefully consider these risk factors associated with investing in the Fund, which may cause investors to lose money. There can be no assurance that the Fund will achieve its investment objective. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation (“FDIC”) or any government agency.

General Market Risk.    The Fund is subject to all of the business risks and uncertainties associated with any mutual fund, including the risk that it will not achieve its investment objective and that

the value of an investment in its securities could decline substantially and cause you to lose some or all of your investment. The Fund’s net asset value (“NAV”) and investment return will fluctuate based upon changes in the value of its portfolio securities. Certain securities in the Fund’s portfolio may be worth less than the price originally paid for them, or less than they were worth at an earlier time.

Adviser Risk.    The Fund may not meet its investment objective or may underperform the market or other mutual funds with similar strategies if the Adviser cannot successfully implement the Fund’s investment strategies.

Concentration Risk.    The Fund’s investment strategy means that the performance of the Fund will be closely tied to the performance of the energy infrastructure industry. The Fund’s focus in this industry presents more risk than if it were broadly diversified over numerous industries and sectors of the economy. An inherent risk associated with any investment focus is that the Fund may be adversely affected if one or two of its investments perform poorly.

Non-Diversified Fund Risk.    Because the Fund is “non-diversified” and may invest a greater percentage of its assets in the securities of a single issuer, a decline in the value of an investment in a single issuer could cause the Fund’s overall value to decline to a greater degree than if the Fund held a more diversified portfolio.

Equity Securities Risk.    Equity securities are susceptible to general stock market fluctuations and to volatile increases and decreases in value. The equity securities held by the Fund may experience sudden, unpredictable drops in value or long periods of decline in value. This may occur because of factors that affect securities markets generally or factors affecting specific industries, sectors, geographic markets, the equity securities of energy infrastructure companies in particular, or a particular company in which the Fund invests.

Foreign Securities Risk.    Investments in securities of foreign companies involve risks not ordinarily associated with investments in securities and instruments of U.S. issuers, including risks relating to political, social and economic developments abroad, differences between U.S. and foreign regulatory and accounting requirements, tax risks, and market practices, as well as fluctuations in foreign currencies.

Currency Risk.    When the Fund buys or sells securities on a foreign stock exchange, the transaction is undertaken in the local currency rather than in U.S. dollars, which carries the risk that the value of the foreign currency will increase or decrease, which may impact the value of the Fund’s portfolio holdings and your investment. Foreign countries may adopt economic policies and/or currency exchange controls that affect its currency valuations in a disadvantageous manner for U.S. investors and companies and restrict or prohibit the Fund’s ability to repatriate both investment capital and income, which could place the Fund’s assets in such country at risk of total loss.

MLP Risk.    MLPs are subject to many risks, including those that differ from the risks involved in an investment in the common stock of a corporation. Holders of MLP units have limited control and voting rights on matters affecting the partnership and are exposed to a remote possibility of liability for all of the obligations of that MLP. Holders of MLP units are also exposed to the risk that they will be required to repay amounts to the MLP that are wrongfully distributed to them. In addition, the value of the Fund’s investment in an MLP will depend largely on the MLP’s treatment as a partnership for U.S. federal income tax purposes. Furthermore, MLP interests may not be as liquid as other more commonly traded equity securities.

MLP Affiliate Risk.    The performance of securities issued by MLP affiliates, including common shares of corporations that own general partner interests, primarily depends on the performance of an MLP. The risks and uncertainties that affect the MLP, its operational results, financial condition, cash flows and distributions also affect the value of securities held by that MLP’s affiliate.

Capital Markets Risk.    MLPs normally pay out the majority of their operating cash flows to partners. Therefore, MLPs and other issuers in which the Fund invests may rely significantly on capital markets for access to equity and debt financing in order to fund organic growth projects and acquisitions. Should market conditions limit issuers’ access to capital markets, their distribution growth prospects could be at risk.

Debt Securities Risk.    Investments in fixed income securities will be subject to credit risk, interest rate risk and prepayment risk. Credit risk is the risk that an issuer will default or fail to pay principal and interest when due. Interest rate risk is the risk that the value of fixed income securities fluctuates with changes in interest rates (e.g., increases in interest rates result in a decrease in value of fixed income securities). The Fund will be exposed to heightened interest rate risk as interest rates rise from historically low levels. Pre-payment risk is the risk that the principal on fixed income securities will be paid off prior to maturity causing the Fund to invest in fixed income securities with lower interest rates. Duration risk is the risk that holding long duration and long maturity investments will magnify certain other risks, including interest rate risk and credit risk.

Below Investment Grade Debt Securities Risk.    Investments in below investment grade debt securities and unrated securities of similar credit quality as determined by the Adviser (commonly known as “junk bonds”) involve a greater risk of default and are subject to greater levels of credit and liquidity risk. Below investment grade debt securities have speculative characteristics and their value may be subject to greater fluctuation than investment grade debt securities.

Large Cap Company Risk.    The Fund’s investments in larger, more established companies are subject to the risk that larger companies are sometimes unable to attain the high growth rates of successful, smaller companies, especially during extended periods of economic expansion. Larger, more established companies may be unable to respond quickly to new competitive challenges such as changes in consumer tastes or innovative smaller competitors potentially resulting in lower markets for their common stock.

Mid Cap and Small Cap Companies Risk.    The mid cap and small cap companies may not have the management experience, financial resources, product or business diversification and competitive strengths of large cap companies. Therefore, these securities may have more price volatility and be less liquid than the securities of larger, more established companies.

Investment Company and RIC Compliance Risk.    The Fund may be subject to increased expenses and reduced performance as a result of its investments in other investment companies and MLPs. When investing in other investment companies, the Fund bears its pro rata share of the other investment company’s fees and expenses including the duplication of advisory and other fees and expenses. The Fund’s investment in MLPs presents unusual challenges in qualifying each year as a “regulated investment company” (a “RIC”) under the Code, a designation which allows the Fund to avoid paying taxes at regular corporate rates on its income. If for any taxable year the Fund fails to qualify as a RIC, the Fund’s taxable income will be subject to federal income tax at regular corporate rates. The resulting increase to the Fund’s expenses will reduce its performance and its income available for distribution to shareholders.

IPO Risk.    The market value of IPO shares will fluctuate considerably due to factors such as the absence of a prior public market, unseasoned trading, the small number of shares available for trading and limited information about the issuer. The purchase of IPO shares may involve high transaction costs. IPO shares are subject to market risk and liquidity risk.

Cybersecurity Risk.    Investment advisers, including the Adviser, must rely in part on digital and network technologies (collectively “cyber networks”) to conduct their businesses. Such cyber networks might in some circumstances be at risk of cyber-attacks that could potentially seek unauthorized access to digital systems for purposes such as misappropriating sensitive information, corrupting data, or causing operational disruption.

Illiquid Investments Risk.    The Fund may be exposed to liquidity risk when trading volume, lack of a market maker, or legal restrictions impair the Fund’s ability to sell particular securities at an advantageous price or in a timely manner. Illiquid investments may include restricted securities that cannot be sold immediately because of statutory and contractual restrictions on resale.

Energy Infrastructure Industry Risk.    Companies in the energy infrastructure industry are subject to many risks that can negatively impact the revenues and viability of companies in this industry, including, but not limited to risks associated with companies owning and/or operating pipelines, gathering and processing assets, power infrastructure, propane assets, as well as capital markets, terrorism, natural disasters, climate change, operating, regulatory, environmental, supply and demand, and price volatility risks.

Energy Industry Risk.    Companies in the energy industry are subject to many business, economic, environmental, and regulatory risks that can adversely affect the costs, revenues, profits, and viability of companies in the industry. These risks include, but are not limited to, the following: volatility in commodity prices and changes in supply and demand, which may affect the volume of energy commodities transported, processed, stored and or distributed; specific risks associated with companies owning and/or operating pipelines, gathering and processing energy assets; operating risks including outages, structural and maintenance, impairment and safety problems; changes in the regulatory environment at federal, state and local levels, and in foreign markets; environmental regulation and liability risk; terrorism risk; extreme weather and other natural disasters; and capital markets risk, resulting in a higher capital costs or impacting growth and access to capital.

Convertible Securities Risk.    Convertible securities are hybrid securities that have characteristics of both bonds and common stocks and are therefore subject to both debt security risks and equity risk. Convertible securities are subject to equity risk especially when their conversion value is greater than the interest and principal value of the bond. The prices of equity securities may rise or fall because of economic or political changes and may decline over short or extended periods of time.

Preferred Stock Risk.    A preferred stock is a blend of the characteristics of a bond and common stock. It may offer a higher yield than common stock and has priority over common stock in equity ownership, but it does not have the seniority of a bond and, unlike common stock, its participation in the issuer’s growth may be limited. Although the dividend on a preferred stock may be set at a fixed annual rate, in some circumstances it may be changed or passed by the issuer. Preferred stock generally does not confer voting rights.