UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES

Investment Company Act file number 811-22072

NXG Cushing Midstream Energy Fund
(Exact name of registrant as specified in charter)

4925 Greenville Avenue, Suite 1310

Dallas, TX 75206
(Address of principal executive offices) (Zip code)

John Musgrave

4925 Greenville Avenue, Suite 1310

Dallas, TX 75206
(Name and address of agent for service)

214-692-6334

Registrant's telephone number, including area code

Date of fiscal year end: November 30

Date of reporting period: May 31, 2026

Item 1. Reports to Stockholders.

Table of Contents

Dear Fellow Shareholder,

For the six-month fiscal period ended May 31, 2026 (the “period”), The NXG Cushing^® Midstream Energy Fund (the “Fund”) delivered a Net Asset Value Total Return (equal to the change in net asset value (“NAV”) per share plus reinvested cash distributions from underlying Fund investments during the period) of 28.26%, versus a total return of 11.34% for the S&P 500^® Index (Total Return) (“S&P 500”). The Fund’s Share Price Total Return (equal to the change in market price per share plus reinvested cash distributions from underlying Fund investments paid during the period) was 28.61%, for the period and differs from the Net Asset Value Total Return due to fluctuations in the discount of share price to NAV. The Fund’s shares traded at a 4.53% discount to NAV as of the end of the period, compared to a 4.79% discount at the end of the Fund’s last fiscal year and a 0.99% discount as of May 31, 2025. As measured by the Alerian Midstream Energy Select Index (Total Return) (“AMEI”), the performance of the midstream energy sector increased by 22.15% for the period.

Industry Overview and Themes

A central theme of the period, in our opinion, was a strengthening market view of midstream energy infrastructure as hard assets tied to several forms of scarcity: reliable natural gas supply, secure export capacity, power availability, and physical logistics.

That view developed against a difficult starting point. West Texas Intermediate crude oil had broken below $60 per barrel and tested the mid-$50s by December, pressured by expectations of a 2026 supply surplus, record U.S. production, and a geopolitical risk premium that faded as Russia-Ukraine peace talks advanced. Natural gas moved the other way, touching a multi-year high in December on demand from data centers and liquefied natural gas (LNG) export facilities. The split widened an already large valuation gap, with natural gas-oriented infrastructure carrying a premium for visible, contracted growth while liquids-oriented names traded at a three-to-four-turn EV/EBITDA discount on fears that sub-$60 crude oil would eventually reduce rig counts and volumes.

The period changed abruptly in March, when a joint U.S.-Israeli campaign against Iran, Operation Epic Fury, sharply curtailed traffic through the Strait of Hormuz, a conduit for roughly a fifth of global crude oil and LNG trade. As several critical Middle East producers declared force majeure, crude oil moved above $100 per barrel by mid-March, and even the largest coordinated strategic reserve release in the history of the International Energy Agency provided only partial relief.

Natural gas markets faced their own reliability test. Winter Storm Fern froze a meaningful share of U.S. output in January, reinforcing the value of storage, location, and pipeline connectivity. The disruption at Qatar’s Ras Laffan complex resulting from an Iranian attack and the Strait of Hormuz closure then put roughly a fifth of global LNG supply at risk, sending European and Asian benchmarks meaningfully higher and adding support for long-term contracting with reliable U.S. LNG exporters.

Outside of the geopolitical shocks, AI-driven electricity demand continued to emerge as a structural growth driver for midstream. Hyperscalers announced additional large data-center investments, and midstream operators reported rising natural gas demand for capacity to serve utilities, grid-connected projects, and behind-the-meter generation. Data centers require more than chips and software; they require reliable power, natural gas supply, cooling, and land. In markets where grid interconnection queues stretch for years, natural gas-fired generation connected to existing or expandable pipeline systems can be one of the fastest paths to dependable power. In our view, that made natural gas infrastructure a central part of the AI buildout, not a distant beneficiary.

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The improving fundamental backdrop was also visible in first-quarter results reported during the period, which delivered one of the sector’s best earnings beats in years. Roughly two-thirds of our coverage either raised 2026 EBITDA guidance or indicated they were tracking ahead of plan, an unusual level of confidence this early in the year.

The sector has also continued to fund growth while returning capital, a combination that would have been difficult in prior cycles. Although sector-wide capital spending has increased materially since 2021, returns on invested capital have held up and leverage remains generally conservative. Across the Alerian Midstream Energy Index, companies have repurchased a record amount of equity over the last year, and the vast majority of the index increased dividends. Unlike prior capital spending cycles, this buildout has been concentrated in demand-pull projects tied to LNG exports, natural gas-fired utility-scale power, off-grid data center power generation, and constrained basins rather than speculative supply-push projects.

The sector’s gains for the period were front-loaded, with energy the best-performing S&P 500 sector through February before the war turned a clear leadership trend into a more uneven trade. Midstream equities gained little over the final two months of the period, lagging the impressive AI-fueled performance of the broader market, which rallied to new all-time highs.

Stocks continued to trade partly on the path of crude oil prices and the conflict, even as the underlying fundamentals improved. In our view, the period strengthened the case for U.S. midstream infrastructure. Fundamental drivers improved across energy security, Permian natural gas and natural gas liquids (NGL) development, LNG and liquefied petroleum gas (LPG) exports, and natural gas-fired power demand. Investors increasingly favored hard assets with durable cash flows, while companies continued to fund growth, maintain conservative balance sheets, and return capital to shareholders.

Fund Performance and Strategy

For the period, the Fund posted a 28.26% NAV total return, outperforming the AMEI, which returned 22.15%. Absolute performance was driven by a combination of core midstream strength and exposure to the broader power and infrastructure value chain. The largest positive subsector contributions came from Large Cap Diversified C-Corps, Natural Gas Gatherers & Processors and Engineering & Construction. Utilities were the largest absolute detractor. Subsector contributions reflect both portfolio weights and underlying security returns.

On an absolute basis, the largest contributors included Bloom Energy Corporation (NYSE: BE), TC Energy Corporation (NYSE: TRP), and Plains GP Holdings, L.P. (NASDAQ: PAGP). The strongest contributors generally shared exposure to natural gas infrastructure, Permian and NGL growth, energy exports, and power availability for data centers and other large loads. On the negative side, the largest absolute detractors included Constellation Energy Corporation (NASDAQ: CEG), NRG Energy, Inc. (NYSE: NRG), and First Solar, Inc. (NASDAQ: FSLR). Those detractors were concentrated in utilities, solar equipment, and selected power infrastructure holdings that were volatile as investors reassessed the timing, regulation, and profitability of AI-driven electricity demand.

Relative to the benchmark, the largest contributors were Bloom Energy, Nextpower Inc. (NASDAQ: NXT), and GE Vernova Inc. (NYSE: GEV). The largest relative detractors were Venture Global, Inc. (NYSE: VG), Constellation Energy, and South Bow Corporation (TSX: SOBO). The relative detractors came from different sources. Venture Global, which was not held by the fund during the period, and South Bow were primarily benchmark exposure gaps, while Constellation was an owned position and options exposure that detracted on both an absolute and relative basis.

Bloom Energy was the Fund’s largest absolute and relative contributor. We held the position because we believed the market was beginning to value dependable on-site power as a strategic bottleneck reliever for AI data centers and other large-load customers. That thesis was supported during the period. Bloom announced a purchase agreement with an American Electric Power Co subsidiary and an expanded relationship tied to Oracle’s New Mexico AI facility, reported first-quarter revenue that more than doubled year-over-year, and

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raised full-year guidance. The stock responded to the combination of visible demand, improving profitability, and a clearer role for fuel-cell systems in behind-the-meter power architecture. Our position and related options exposure captured that move.

Nextpower also contributed meaningfully. The company benefited from healthy solar demand, strong bookings, a record backlog, and guidance that pointed to continued growth beyond its legacy tracker business. During May, the company also announced an acquisition intended to expand its exposure to battery storage, power reliability, and data-center applications. We view the position as part of the broader physical infrastructure opportunity rather than a simple solar trade. Grid congestion, interconnection delays, and large-load power needs are creating demand for equipment and services that help customers bring reliable power to market faster.

GE Vernova contributed as investors continued to reward companies with direct exposure to power equipment scarcity. The company entered the period with strong demand across natural gas-fired generation, grid equipment, and electrification. First-quarter results and guidance reinforced that the power equipment cycle is being supported by AI data centers, grid modernization, industrial load growth, and energy security. The stock’s contribution reflected both earnings momentum and the market’s willingness to assign higher value to businesses that can supply the physical equipment required for the next phase of power demand growth.

Venture Global was the largest relative detractor because the Fund had no exposure while the stock contributed positively to the benchmark. The company rallied as U.S. LNG exporters benefited from the disruption to Middle East LNG supply and as first-quarter results and guidance improved. We have remained selective in LNG equities, particularly where contract, arbitration, governance, or valuation issues can overwhelm the underlying export-demand thesis. In this case, the absence of a position detracted from relative results.

Constellation Energy was the second-largest relative detractor and the largest absolute detractor. We owned the position as part of our broader view that nuclear and other firm power assets could become more valuable as AI-driven electricity demand grows. That view remains intact, but the stock was volatile during the period as investors weighed strong operating results against regulatory timing, data-center contract visibility, and the market’s willingness to continue paying a premium for power producers after a strong prior run. The position detracted, and we are monitoring the balance between long-term demand visibility and near-term valuation risk.

South Bow detracted because the Fund was underweight relative to the benchmark while the stock performed well. The drag was an opportunity cost rather than an owned loss. Its performance was consistent with the broader bid for long-haul crude oil pipeline and Canadian energy infrastructure exposure during a period of higher crude oil prices and renewed focus on logistics assets.

Overall, the Fund benefited from owning companies tied to scarce power, natural gas infrastructure, exports, and Permian growth, while relative results were held back by selected benchmark exposure gaps and volatility in power-related holdings. We are pleased with the Fund’s absolute and relative results for the period, but the attribution reinforces the need to remain selective. The market is rewarding infrastructure scarcity, but not all exposure to that theme is equally attractive. We continue to favor companies with visible project backlogs, strong balance sheets, disciplined capital allocation, and direct exposure to constrained infrastructure.

Leverage

The Fund’s investment strategy focuses on holding core positions in companies generating stable cash flows and long-term growth prospects. We also work diligently to manage the use of leverage for additional income and total return potential. This involves leveraging investments when the probabilities of positive total return are deemed to be skewed favorably. As the prices of the Fund’s investments increase or decline, there is a risk that the impact to the Fund’s NAV and total return will be negatively impacted by leverage, but this strategy is intended to have a positive impact over the longer term.

Average leverage for the period was 132% of managed assets, which compares to an average 132% leverage ratio in the comparable period from the prior fiscal year.

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Closing

We enter the second half of the fiscal year with a constructive view of the midstream sector and the broader energy infrastructure opportunity. The period reinforced that demand growth is no longer dependent on a single macro variable. LNG exports, AI-driven power demand, electrification, industrial reshoring, and energy security concerns are increasing the value of infrastructure that can deliver reliable energy into constrained markets.

In our view, natural gas infrastructure remains the clearest expression of that opportunity. Data centers and other large-load customers need around-the-clock power, and the existing grid is struggling to accommodate the speed and location of that demand. That is creating opportunities across natural gas transmission, gathering and processing, storage, and behind-the-meter power solutions. We expect the advantaged companies to be those that can convert demand into long-term contracts while maintaining discipline on leverage and project returns.

We also see value in selected liquids infrastructure. Fourth-quarter crude oil weakness created broad pessimism toward liquids-oriented names, even though volumes remained resilient and several companies continued to return significant capital. The first-half geopolitical backdrop reminded investors that crude oil, NGL, and LPG logistics remain critical. Our focus is on assets with durable cash flows and valuations that do not fully reflect their long-term earnings power.

Capital allocation remains central to our long-term thesis. We believe the better operators are investing in growth within free cash flow, maintaining stronger balance sheets than in prior cycles, and continuing to return capital through dividends and buybacks. We believe that combination should remain attractive as investors continue to favor hard assets with durable cash flows and visible growth.

We remain highly confident in the long-term opportunity ahead and believe the midstream sector has the potential to deliver sustained outperformance and meaningful value creation.

We truly appreciate your support and look forward to continuing to help you achieve your investment goals.

Sincerely,

John Musgrave
Chief Executive Officer ● President ● Chief Investment Officer ● Portfolio Manager

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The information provided herein represents the opinion of the Fund’s portfolio managers and is not intended to be a forecast of future events, a guarantee of future results, nor investment advice. The opinions expressed are as of the date of this report and are subject to change.

The information in this report is not a complete analysis of every aspect of any market, sector, industry, security or the Fund itself. Statements of fact are from sources considered reliable, but the Fund makes no representation or warranty as to their completeness or accuracy. Discussions of specific investments or references to third-party forecasts of specific infrastructure projects are for illustration only and are not intended as recommendations of individual investments. Fund holdings and sector allocations are subject to change at any time and are not recommendations to buy or sell any security. Please refer to the Schedule of Investments for a complete list of Fund holdings.

Past performance does not guarantee future results. Investment return, net asset value and common share market price will fluctuate so that you may have a gain or loss when you sell shares. Since the Fund is a closed-end management investment company, shares of the Fund may trade at a discount or premium from net asset value. This characteristic is separate and distinct from the risk that net asset value could decrease as a result of investment activities and may be a greater risk to investors expecting to sell their shares after a short time. The Fund cannot predict whether shares will trade at, above or below net asset value. The Fund should not be viewed as a vehicle for trading purposes. It is designed primarily for risk-tolerant long-term investors.

An investment in the Fund involves risks. Leverage creates risks which may adversely affect returns, including the likelihood of greater volatility of net asset value and market price of the Fund’s common shares. The Fund is non-diversified, meaning it may concentrate its assets in fewer individual holdings than a diversified fund. Therefore, the Fund is more exposed to individual stock volatility than a diversified fund.

The Fund will invest in energy companies, including Master Limited Partnerships (MLPs), which concentrate investments in the natural resources sector. Energy companies are subject to certain risks, including, but not limited to the following: fluctuations in the prices of commodities; the highly cyclical nature of the natural resources sector may adversely affect the earnings or operating cash flows of the companies in which the Fund will invest; a significant decrease in the production of energy commodities could reduce the revenue, operating income, operating cash flows of MLPs and other natural resources sector companies and, therefore, their ability to make distributions or pay dividends and a sustained decline in demand for energy commodities could adversely affect the revenues and cash flows of energy companies. Holders of MLP units are subject to certain risks inherent in the structure of MLPs, including tax risks; the limited ability to elect or remove management or the general partner or managing member; limited voting rights and conflicts of interest between the general partner or managing member and its affiliates, on the one hand, and the limited partners or members, on the other hand. Damage to facilities and infrastructure of MLPs may significantly affect the value of an investment and may incur environmental costs and liabilities due to the nature of their business. Investors in MLP funds incur management fees from underlying MLP investments. Small- and mid-cap stocks are often more volatile and less liquid than large-cap stocks. Smaller companies generally face higher risks due to their limited product lines, markets, and financial resources. Funds that invest in bonds are subject to interest-rate risk and can lose principal value when interest rates rise. Bonds are also subject to credit risk, in which the bond issuer may fail to pay interest and principal in a timely manner. High yield securities have speculative characteristics and present a greater risk of loss than higher quality debt securities. These securities can also be subject to greater price volatility. An investment in the Fund will involve tax risks, including, but not limited to: The portion, if any, of a distribution received by the Fund as the holder of an MLP equity security that is offset by the MLP’s tax deductions or losses generally will be treated as a return of capital to the extent of the Fund’s tax basis in the MLP equity security, which will cause income or gain to be higher, or losses to be lower, upon the sale of the MLP security by the Fund. Changes in tax laws, regulations or interpretations of those laws or regulations in the future could adversely affect the Fund or the energy companies in which the Fund will invest.

The potential tax benefits of investing in MLPs depend on them being treated as partnerships for federal income tax purposes. If the MLP is deemed to be a corporation then its income would be subject to federal taxation at the entity level, reducing the amount of cash available for distribution to the Fund which could result in a reduction of the Fund’s value.

The Fund incurs operating expenses, including advisory fees, as well as leverage costs. Investment returns for the Fund are shown net of fees and expenses.

The S&P 500 Index is an unmanaged index of common stocks that is frequently used as a general measure of stock market performance. The Alerian Midstream Energy Select Index is a capitalization-weighted index of North American energy infrastructure companies. Neither of these indices include fees or expenses. It is not possible to invest directly in an index.

Certain information contained herein may constitute “forward-looking” statements, which can be identified by the use of forward-looking terminology such as “may,” “will,” “should,” “expect,” “estimate,” or “believe” or other variations thereof. Such statements reflect various assumptions by NXG concerning anticipated trends or events, which may or may not occur. Due to various risks and uncertainties, actual events or results may differ materially from those reflected or contemplated in such forward-looking statements.

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Data for NXG Cushing Midstream Energy Fund (the “Fund”) represents returns based on the change in the Fund’s net asset value assuming the reinvestment of all dividends and distributions. These returns differ from the total investment return based on market value of the Fund’s shares due to the difference between the Fund’s net asset value of its shares outstanding (See page 16 for total investment return based on market value). Past performance is no guarantee of future results.

The Alerian Midstream Energy Select Index is a capitalization-weighted index of North American energy infrastructure companies. The S&P 500 Index is an unmanaged index of common stocks that is frequently used as a general measure of stock market performance. You cannot invest directly in an index.

The graph and table do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or the redemption of the Fund shares.

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The information presented below regarding Distributable Cash Flow is supplemental non-GAAP financial information, which we believe is meaningful to understanding our operating performance. Supplemental non-GAAP measures should be read in conjunction with our full financial statements.

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8

See Accompanying Notes to the Financial Statements.

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See Accompanying Notes to the Financial Statements.

10

See Accompanying Notes to the Financial Statements.

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See Accompanying Notes to the Financial Statements.

12

See Accompanying Notes to the Financial Statements.

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See Accompanying Notes to the Financial Statements.

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See Accompanying Notes to the Financial Statements.

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See Accompanying Notes to the Financial Statements.

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1. Organization

NXG Cushing^® Midstream Energy Fund was formed as a Delaware statutory trust on May 23, 2007, and is a non-diversified, closed-end investment company under the Investment Company Act of 1940, as amended (the “1940 Act”). The Fund is managed by Cushing^® Asset Management, LP, d/b/a NXG Investment Management (the “Adviser”). The Fund’s investment objective is to obtain a high after-tax total return from a combination of capital appreciation and current income. The Fund commenced operations on August 27, 2007. The Fund’s common shares are listed on the New York Stock Exchange (the “Exchange”) under the symbol “SRV.”

The Fund represents a single operating segment. An operating segment is defined in U.S. Generally Accepted Accounting Principles (“U.S. GAAP”) as a component of a public entity that engages in business activities from which it may recognize revenues and incur expenses, has operating results that are regularly reviewed by the public entity’s chief operating decision maker (“CODM”) to make decisions about resources to be allocated to the segment and assess its performance, and has discrete financial information available. The Fund’s President is the CODM. The CODM monitors the operating results of the Fund as a whole and the pre-determined Fund’s long term investment strategy, which is executed by the portfolio management group. The qualitative and quantitative information contained within the financial statements is used by the CODM to assess the segment’s performance versus the Fund’s comparative benchmark and to make resource allocation decisions. Segment assets are reflected on the Statement of Assets and Liabilities and segment expenses are listed on the Statement of Operations.

2. Significant Accounting Policies

A. Use of Estimates

The following is a summary of significant accounting policies, consistently followed by the Fund in preparation of the financial statements. The Fund is considered an investment company and accordingly, follows the investment company accounting and reporting guidance of the Financial Accounting Standards Board Accounting Standard Codification Topic 946, Financial Services — Investment Companies, which is part of U.S. Generally Accepted Accounting Principles.

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amount of assets and liabilities, recognition of distribution income and disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates.

B. Investment Valuation

The Board of Trustees has designated the Adviser as the “valuation designee” for the Fund pursuant to Rule 2a-5 under the 1940 Act. The valuation designee is responsible for making fair value determinations pursuant to valuation policies and procedures adopted by the Adviser and the Fund (the “Valuation Policy”). A committee of voting members comprised of senior personnel of the Adviser considers various pricing issues and establishes fair valuations of portfolio securities and other instruments held by the Fund in accordance with the Valuation Policy (the “Valuation Committee”). The Adviser as valuation designee is subject to monitoring and oversight by the Board of Trustees. As a general principle, the fair value of a portfolio instrument is the amount that an owner might reasonably expect to receive upon the instrument’s current sale. A range of factors and analysis may be considered when determining fair value, including relevant market data, interest rates, credit considerations and/or issuer specific news. The Valuation Committee may consult with and receive input from third parties and will utilize a variety of market data including yields or prices of investments of comparable quality, type of issue, coupon, maturity, rating, indications of value from security dealers, evaluations of anticipated cash flows or collateral,

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spread over U.S. Treasury obligations, and other information and analysis. In addition, the Valuation Committee may consider valuations provided by valuation firms retained to assist in the valuation of certain of the Fund’s investments. Fair valuation involves subjective judgments. While the Fund’s use of fair valuation is intended to result in calculation of net asset value that fairly reflects values of the Fund’s portfolio securities as of the time of pricing, the Fund cannot guarantee that any fair valuation will, in fact, approximate the amount the Fund would actually realize upon the sale of the securities in question. It is possible that the fair value determined for a portfolio instrument may be materially different from the value that could be realized upon the sale of that instrument.

The valuation designee uses the following valuation methods to determine fair value as either fair value for investments for which market quotations are available, or if not available, the fair value, as determined in good faith pursuant to the Valuation Policy. The valuation of the portfolio securities of the Fund currently includes the following processes:

(i) The market value of each security listed or traded on any recognized securities exchange or automated quotation system will be the last reported sale price at the relevant valuation date on the composite tape or on the principal exchange on which such security is traded except those listed on the NASDAQ Global Market^®, NASDAQ Global Select Market^® and the NASDAQ Capital Market^® exchanges (collectively, “NASDAQ”). Securities traded on NASDAQ will be valued at the NASDAQ Official Closing Price (“NOCP”). If no sale is reported on that date, the security will be valued at the last reported bid price. If the Valuation Committee determines that price is not representative of the actual market price, the Valuation Committee may determine the fair value of the security.

(ii) Securities not traded on a U.S. exchange or NASDAQ and foreign securities that are traded on foreign exchanges whose operations are similar to the U.S. over-the-counter market will be valued at prices supplied by a pricing service. If the Valuation Committee determines that price is not representative of the actual market price, the Valuation Committee may determine the fair value of the security.

(iii) Debt securities will be valued based on evaluated mean prices by an outside pricing service that employs a pricing model that takes into account bids, yield spreads, and/or other market data and specific security characteristics (e.g., credit quality, maturity and coupon rate). If a price cannot be obtained from pricing services, quotes from market makers or brokers may be used. When possible, more than one market maker or broker should be utilized and the mean of bid and ask prices should be used.

(iv) Private Placements in Public Entities (“PIPES”) will be valued using the price of the publicly traded common stock as a baseline, deducting the discount realized on the original purchase and amortizing the difference over the restricted period.

(v) Listed options on debt or equity securities are valued at the last sale price or, if there are no trades for the day, the mean of the closing bid price and ask price. Unlisted options on debt or equity securities are valued based upon their composite bid prices if held long, or their composite ask prices if held short. Futures are valued at the settlement price. Premiums for the sale of options written by an investment company registered under the 1940 Act (a “Registered Fund”) will be included in the assets of such Registered Fund, and the market value of such options will be included as a liability.

(vi) For valuation purposes, quotations of foreign portfolio securities, other assets and liabilities and forward contracts stated in foreign currency are as of the close of regular trading on the Exchange each day the Exchange is open for trading (or earlier as may be specified by the Registered Fund) and translated into U.S. dollar equivalents at the current prevailing market rates as quoted by a pricing service.

(vii) Foreign securities are valued using “fair value factors”. Fair value factors consider daily trade activity and price changes for depositary receipts, exchange-traded funds, index futures, foreign currency exchange activity, or other relevant market data.

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(viii) Over-the-counter options on foreign securities and currencies are fair valued by obtaining the “last available bid” from a single dealer that is either the writer or purchaser of the option.

(ix) Swaps will be valued using market-based prices provided by pricing services or broker-dealer bid counterparty quotations.

(x) Whenever trading in a listed security held in a portfolio is temporarily suspended, halted or delisted from an exchange, the security may be priced using the last closing price for a period of up to 5 business days. The Valuation Committee will continue to monitor the security during this period and, if there is a belief that the last closing price does not reflect the fair value of such security, then the value of such security will be determined by the Valuation Committee based on factors the Valuation Committee deems relevant. Whenever any such valuation determination is made, the Valuation Committee will monitor the market and other sources of information available to it in order to ascertain whether any change in circumstance would suggest a change in the value so determined.

The Fund may engage in short sale transactions. For financial statement purposes, an amount equal to the settlement amount, if any, is included in the Statement of Assets and Liabilities as a liability. The amount of the liability is subsequently marked-to-market to reflect the fair value of the short positions. Subsequent fluctuations in market prices of securities sold short may require purchasing the securities at prices which may differ from the fair value reflected on the Statement of Assets and Liabilities. When the Fund sells a security short, it must borrow the security sold short and deliver it to the broker-dealer through which it made the short sale. A gain, limited to the price at which the Fund sold the security short, or a loss, unlimited in size, will be recognized under the termination of a short sale. The Fund is also subject to the risk that it may be unable to reacquire a security to terminate a short position except at a price substantially in excess of the last quoted price. The Fund is liable for any distributions and dividends (collectively referred to as “Distributions”) paid on securities sold short and such amounts, if any, are reflected as a Distribution expense in the Statement of Operations. The Fund’s obligation to replace the borrowed security is secured by collateral deposited with the broker-dealer. The Fund also is required to segregate similar collateral to the extent, if any, necessary so that the value of both collateral amounts in the aggregate is at all times equal to at least 100% of the fair value of the securities sold short. The Fund did not participate in short selling activities for the period ended May 31, 2026.

C. Security Transactions, Investment Income and Expenses

Security transactions are accounted for on the date securities are purchased or sold (trade date). Realized gains and losses are reported on a high cost basis. Interest income is recognized on an accrual basis, including amortization of premiums and accretion of discounts. Distributions are recorded on the ex-dividend date. Distributions received from the Fund’s investments in master limited partnerships (“MLPs”) generally are comprised of ordinary income, capital gains and return of capital from the MLPs. The Fund records investment income on the ex-date of the distributions. For financial statement purposes, the Fund uses return of capital and income estimates to allocate the distribution income received. Such estimates are based on historical information available from each MLP and other industry sources. These estimates may subsequently be revised based on information received from the MLPs after their tax reporting periods are concluded, as the actual character of these distributions is not known until after the fiscal year end of the Fund.

The Fund estimates the allocation of investment income and return of capital for the distributions received from its portfolio investments within the Statement of Operations. For the period ended May 31, 2026, the Fund has estimated approximately 50% of the distributions received from its portfolio investments to be return of capital.

Expenses are recorded on an accrual basis.

D. Distributions to Shareholders

Distributions to common shareholders are recorded on the ex-dividend date. The character of distributions to common shareholders made during the year may differ from their ultimate characterization for federal income tax purposes. The Fund’s distributions may include a return of capital to shareholders to the extent that distributions

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are in excess of the Fund’s net investment income and net capital gains, determined in accordance with U.S. federal income tax regulations. Distributions that are treated for U.S. federal income tax purposes as a return of capital will reduce each shareholder’s basis in his or her shares and, to the extent the return of capital exceeds such basis, will be treated as a gain to the shareholder from a sale of shares. Returns of shareholder capital may have the effect of reducing the Fund’s assets and increasing the Fund’s expense ratio. For the fiscal year ended November 30, 2025, the Fund’s distributions were 76%, or $19,106,042, ordinary income, 24%, or $5,968,669, long-term capital gains, and 0% return of capital.¹ The final character of distributions paid for the period ended May 31, 2026 will be determined in early 2027.

E. Federal Income Taxation

The Fund intends to qualify each year for special tax treatment afforded to a regulated investment company (“RIC”) under Subchapter M of the Internal Revenue Code of 1986, as amended (“IRC”). In order to qualify as a RIC, the Fund must, among other things, satisfy income, asset diversification and distribution requirements. As long as it so qualifies, the Fund will not be subject to U.S. federal income tax to the extent that it distributes annually its investment company taxable income (which includes ordinary income and the excess of net short- term capital gain over net long-term capital loss) and its “net capital gain” (i.e., the excess of net long-term capital gain over net short-term capital loss). The Fund intends to distribute at least annually substantially all of such income and gain. If the Fund retains any investment company taxable income or net capital gain, it will be subject to U.S. federal income tax on the retained amount at regular corporate tax rates. In addition, if the Fund fails to qualify as a RIC for any taxable year, it will be subject to U.S. federal income tax on all of its income and gains at regular corporate tax rates.

The Fund recognizes in the financial statements the impact of a tax position, if that position is more-likely- than-not to be sustained on examination by the taxing authorities, based on the technical merits of the position. Tax benefits resulting from such a position are measured as the amount that has a greater than fifty percent likelihood on a cumulative basis to be sustained on examination.

F. Cash and Cash Equivalents

The Fund considers all highly liquid investments purchased with initial maturity equal to or less than three months to be cash equivalents.

G. Cash Flow Information

The Fund makes distributions from investments, which include the amount received as cash distributions from MLPs, common stock dividends and interest payments. These activities are reported in the Statement of Changes in Net Assets, and additional information on cash receipts and payments is presented in the Statement of Cash Flows.

H. Indemnification

Under the Fund’s organizational documents, its officers and trustees are indemnified against certain liabilities arising out of the performance of their duties to the Fund. In addition, in the normal course of business, the Fund may enter into contracts that provide general indemnification to other parties. The Fund’s maximum exposure under such indemnification arrangements is unknown, as this would involve future claims that may be made against the Fund that have not yet occurred and may not occur. However, the Fund has not had prior claims or losses pursuant to these contracts and expects the risk of loss to be remote.

I. Derivative Financial Instruments

The Fund provides disclosure regarding derivatives and hedging activity to allow investors to understand how and why the Fund uses derivatives, how derivatives are accounted for, and how derivative instruments affect the Fund’s results of operations and financial position.

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The Fund occasionally purchases and sells (“writes”) put and call equity options as a source of potential protection against a broad market decline. A purchaser of a put option has the right, but not the obligation, to sell the underlying instrument at an agreed upon price (“strike price”) to the option seller. A purchaser of a call option has the right, but not the obligation, to purchase the underlying instrument at the strike price from the option seller. Options are settled for cash.

Purchased Options — Premiums paid by the Fund for purchased options are included in the Statement of Assets and Liabilities as an investment. The option is adjusted daily to reflect the fair value of the option and any change in fair value is recorded as unrealized appreciation or depreciation of investments. If the option is allowed to expire, the Fund will lose the entire premium paid and record a realized loss for the premium amount. Premiums paid for purchased options which are exercised or closed are added to the amounts paid or offset against the proceeds on the underlying investment transaction to determine the realized gain/loss or cost basis of the security.

Written Options — Premiums received by the Fund for written options are included in the Statement of Assets and Liabilities. The amount of the liability is adjusted daily to reflect the fair value of the written option and any change in fair value is recorded as unrealized appreciation or depreciation of options. Premiums received from written options that expire are treated as realized gains. The Fund records a realized gain or loss on written options based on whether the cost of the closing transaction exceeds the premium received. If a call option is exercised by the option buyer, the premium received by the Fund is added to the proceeds from the sale of the underlying security to the option buyer and compared to the cost of the closing transaction to determine whether there has been a realized gain or loss. If a put option is exercised by an option buyer, the premium received by the option seller reduces the cost basis of the purchased security.

Written uncovered call options subject the Fund to unlimited risk of loss. Written covered call options limit the upside potential of a security above the strike price. Put options written subject the Fund to risk of loss if the value of the security declines below the exercise price minus the put premium.

The Fund is not subject to credit risk on written options as the counterparty has already performed its obligation by paying the premium at the inception of the contract.

The Fund has adopted the disclosure provisions of Financial Accounting Standards Board (“FASB”) Accounting Standard Codification 815, Derivatives and Hedging (“ASC 815”). ASC 815 requires enhanced disclosures about the Fund’s use of and accounting for derivative instruments and the effect of derivative instruments on the Fund’s results of operations and financial position. Tabular disclosure regarding derivative fair value and gain/ loss by contract type (e.g., interest rate contracts, foreign exchange contracts, credit contracts, etc.) is required and derivatives accounted for as hedging instruments under ASC 815 must be disclosed separately from those that do not qualify for hedge accounting. Even though the Fund may use derivatives in an attempt to achieve an economic hedge, the Fund’s derivatives are not accounted for as hedging instruments under ASC 815 because investment companies account for their derivatives at fair value and record any changes in fair value in current period earnings.

There were no transactions in purchased options during the period ended May 31, 2026.

The average monthly fair value of written options during the period ended May 31, 2026 was $97,944.

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The effect of derivative instruments on the Statement of Operations for the period ended May 31, 2026:

J. Recent Accounting Pronouncements

On December 14, 2023, the Financial Accounting Standards Board (FASB) issued ASU 2023-09, which establishes new income tax disclosure requirements and modifies or eliminates certain existing disclosure provisions. The amendments in the ASU are intended to address investor requests for more transparency about income tax information and to improve the effectiveness of income tax disclosures. ASU 2023-09 applies to all entities that are subject to ASC 740, Income Taxes. The guidance is effective for the Fund’s fiscal year beginning December 1, 2025 and is applied on a prospective basis. The adoption of this guidance does not have an impact on the Fund’s financial statements.

On 4 November 2024, the FASB issued ASU 2024-03, which requires a Public Business Entity (“PBE”) to disclose, on an annual and interim basis, disaggregated information about certain income statement expense line items on the face of the income statement. The guidance addresses investors’ requests for more detailed expense information, which they said is critical to understanding an entity’s performance, assessing its prospects for future cash flows, and comparing its performance both over time and with that of other entities. The guidance is effective for the Fund’s fiscal year beginning December 1, 2026 and is applied on a prospective basis. The adoption of this guidance does not have an impact on the Fund’s financial statements.

3. Concentrations of Risk

The Fund, under normal market conditions, invests at least 80% of its assets (net assets plus any borrowings for investment purposes) in a portfolio of midstream energy investments. Therefore, the Fund may be subject to more risks than if they were more broadly diversified over numerous industries and sectors of the economy. General changes in market sentiment towards companies in the sectors in which they invest may adversely affect the Fund, and the performance of such sectors may lag behind the broader market as a whole.

The Fund is also subject to MLP structure risk. Holders of MLP units are subject to certain risks inherent in the structure of MLPs, including (i) tax risks, (ii) the limited ability to elect or remove management or the general partner or managing member, (iii) limited voting rights, except with respect to extraordinary transactions, and (iv) conflicts of interest between the general partner or managing member and its affiliates, on the one hand, and the limited partners or members, on the other hand, including those arising from incentive distribution payments or corporate opportunities.

4. Agreements and Related Party Transactions

The Fund has entered into an Investment Management Agreement with the Adviser (the “Agreement”). Under the terms of the Agreement, the Fund pays the Adviser a fee, payable at the end of each calendar month, at an annual rate equal to 1.25% of the average weekly value of the Fund’s Managed Assets during such month for

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the services and facilities provided by the Adviser to the Fund. “Managed Assets” means the total assets of the Fund, minus all accrued expenses incurred in the normal course of operations other than liabilities or obligations attributable to investment leverage, including, without limitation, investment leverage obtained through (i) indebtedness of any type (including, without limitation, borrowing through a credit facility or the issuance of debt securities), (ii) the issuance of shares of preferred stock or other similar preference securities and/or (iii) the reinvestment of collateral received for securities loaned in accordance with the Fund’s investment objective and policies. The Fund’s Board of Trustees has approved a waiver of the advisory fees to be paid to the Adviser in the amount of 0.25% of the Fund’s Managed Assets. The Adviser earned $2,394,542 and waived $478,908 in advisory fees for the period ended May 31, 2026. The Adviser will not recoup any of the waived expenses from the Fund.

The Fund has engaged U.S. Bancorp Fund Services, LLC, d/b/a U.S. Bancorp Global Fund Services (“Fund Services”) to serve as the Fund’s administrator. The Fund pays the administrator a monthly fee computed at an annual rate of 0.08% of the first $100,000,000 of the Fund’s average daily net assets, 0.05% on the next $200,000,000 of average daily net assets and 0.04% on the balance of the Fund’s average daily net assets, with a minimum annual fee of $45,000.

Fund Services serves as the Fund’s transfer agent, dividend paying agent, and agent for the automatic dividend reinvestment plan.

U.S. Bank, N.A. serves as the Fund’s custodian. The Fund pays the custodian a monthly fee computed at an annual rate of 0.004% of the Fund’s average daily market value, with a minimum annual fee of $4,800.

Fees paid to trustees for their services to the Fund are reflected as Trustees’ fees on the Statement of Operations.

5. Income Taxes

It is the Fund’s intention to continue to qualify as a RIC under Subchapter M of the IRC and distribute all of its taxable income. Accordingly, no provision for federal income taxes is required in its financial statements.

The Company follows ASC 740, Income Taxes (“ASC 740”). ASC 740 provides guidance for how uncertain tax positions should be recognized, measured, presented and disclosed in the financial statements. ASC 740 requires the Company to evaluate tax positions taken or expected to be taken in the course of preparing its consolidated financial statements to determine whether the tax positions are “more-likely-than-not” to be sustained by the applicable tax authority. Tax positions not deemed to meet the “more-likely-than-not” threshold are reserved and recorded as a tax benefit or expense in the current year. All penalties and interest associated with income taxes are included in income tax expense. Conclusions regarding tax positions are subject to review and may be adjusted at a later date based on factors including, but not limited to, on-going analyses of tax laws, regulations and interpretations thereof.

The amount and character of income and capital gain distributions to be paid, if any, are determined in accordance with federal income tax regulations, which may differ from U.S. generally accepted accounting principles. These differences are primarily due to differences in the timing of recognition of gains or losses on investments. Permanent book and tax basis differences resulted in the reclassifications of $620,925 to accumulated net gains and $620,925 from additional paid-in capital.

The following information is provided on a tax basis as of November 30, 2025:

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As of November 30, 2025, for federal income tax purposes, capital loss carryforwards of $10,463,050 were available as shown in the table below, to the extent provided by the Internal Revenue Code, to offset future realized capital gains through the years indicated.

The Fund utilized $188,142 of capital loss carryforward during the fiscal year ended November 30, 2025.

The Fund recognizes the tax benefits of uncertain tax positions only where the position is “more likely than not” to be sustained assuming examination by tax authorities. Management has analyzed the Fund’s tax positions and has concluded that no liability for unrecognized tax benefits should be recorded related to uncertain tax positions taken on U.S. tax returns and state tax returns filed since inception of the Fund. No income tax returns are currently under examination. All tax years beginning with November 30, 2022 remain subject to examination by the tax authorities in the United States. Due to the nature of the Fund’s investments, the Fund may be required to file income tax returns in several states. The Fund is not aware of any tax positions for which it is reasonably possible that the total amounts of unrecognized tax benefits will change materially in the next 12 months.

6. Fair Value Measurements

Various inputs that are used in determining the fair value of the Fund’s investments are summarized in the three broad levels listed below:

The inputs or methodology used for valuing securities are not necessarily an indication of the risk associated with investing in those securities.

These inputs are summarized in the three levels listed below.

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7. Investment Transactions

For the period ended May 31, 2026, the Fund purchased (at cost) and sold securities (proceeds) in the amount of $681,378,875 and $577,080,524 (excluding short-term securities), respectively. The Fund sold written options (proceeds) in the amount of $8,341,124.

8. Common Shares

The Fund had unlimited common shares of beneficial interest authorized and 6,234,375 shares outstanding as of May 31, 2026. Transactions in common shares for the fiscal year ended November 30, 2025 and period ended May 31, 2026 were as follows:

On May 17, 2024, the Fund entered into a Distribution Agreement (the “Distribution Agreement”) with Foreside Fund Services, LLC (the “Distributor”), pursuant to which the Fund may offer and sell up to 175,000 common shares, from time to time, through the Distributor, in transactions that are deemed to be “at-the-market” as defined in Rule 415 under the Securities Act of 1933. The minimum price on any day at which common shares may be sold will not be less than the then current net asset value per common share plus any commissions to be paid to the Distributor. For the fiscal year 2024, the Fund issued 93,843 shares, generating gross proceeds of $4 million under the Distribution Agreement. On January 13, 2025, the Fund amended the agreement to increase the offering capacity to 745,000 common shares, subject to the same pricing conditions. For the fiscal year ended November 30, 2025, the Fund issued 642,222 shares under the Distribution Agreement, generating gross proceeds of $27.6 million. In December 2025, the Fund issued 1,555,870 shares in connection with a transferable rights offering, raising gross proceeds of approximately $62 million.

9. Borrowing Facilities

The Fund maintains a margin account arrangement with Scotiabank™. The interest rate charged on margin borrowing is tied to the cost of funds for Scotiabank™, approximating SOFR plus 0.75%. Proceeds from the margin account arrangement are used to execute the Fund’s investment objective.

The average principal balance and interest rate for the period during which the credit facilities were utilized during the period ended May 31, 2026 was $108,502,250 and 4.42%, respectively. As of May 31, 2026, the principal balance outstanding was $118,315,000 and accrued interest expense was $477,321.

10. Subsequent Events

Subsequent to May 31, 2026, the Fund declared monthly distributions to common shareholders in the amounts of $.5000 per share, payable on June 30, 2026 and July 31, 2026, to shareholders of record on June 15, 2026 and July 15, 2026, respectively.

On July 10, 2026, the Fund entered into a new Distribution Agreement (the “New Distribution Agreement”) with Foreside Fund Services, LLC (the “Distributor”), pursuant to which the Fund may offer and sell up to 1,500,000 Common Shares, from time to time, through the Distributor, in transactions that are deemed to be “at-the-market” as defined in Rule 415 under the Securities Act of 1933. The minimum price on any day at which Common Shares may be sold will not be less than the then current net asset value per Common Share plus any commissions to be paid to the Distributor.

There were no additional subsequent events through the date the financial statements were issued that would require adjustments to or additional disclosure in these financial statements.

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Cautionary Note Regarding Forward-Looking Statements

This report contains “forward-looking statements” as defined under the U.S. federal securities laws. Generally, the words “believe,” “expect,” “intend,” “estimate,” “anticipate,” “project,” “will” and similar expressions identify forward-looking statements, which generally are not historical in nature. Forward-looking statements are subject to certain risks and uncertainties that could cause actual results to materially differ from the Fund’s historical experience and its present expectations or projections indicated in any forward-looking statements. These risks include, but are not limited to, changes in economic and political conditions; regulatory and legal changes; MLP industry risk; leverage risk; valuation risk; interest rate risk; tax risk; and other risks discussed in the Fund’s filings with the SEC. You should not place undue reliance on forward-looking statements, which speak only as of the date they are made. The Fund undertakes no obligation to update or revise any forward-looking statements made herein. There is no assurance that the Fund’s investment objective will be attained.

Trustee and Executive Officer Compensation

The Fund does not currently compensate any of its trustees who are interested persons or any of its officers. For the period ended May 31, 2026, the aggregate compensation paid by the Fund to the independent trustees was $117,521. The Fund did not pay any special compensation to any of its trustees or officers. The Fund continuously monitors standard industry practices and this policy is subject to change.

Portfolio Turnover

The portfolio turnover rate for the period ended May 31, 2026 was 156.70%. Portfolio turnover may vary greatly from period to period. The Fund does not consider portfolio turnover rate a limiting factor in the Adviser’s execution of investment decisions, and the Fund may utilize investment and trading strategies that may involve high portfolio turnover. A higher portfolio turnover rate results in correspondingly greater brokerage commissions and other transactional expenses that are borne by the Fund.

Proxy Voting Policies

A description of the policies and procedures that the Fund uses to determine how to vote proxies relating to portfolio securities owned by the Fund and information regarding how the Fund voted proxies relating to the portfolio of securities during the 12-month period ended June 30 are available to stockholders without charge, upon request by calling the Fund toll-free at (800) 236-4424 and on the Fund’s website at www.nxgim.com. Information regarding how the Fund voted proxies relating to the portfolio of securities during the 12-month period ended June 30 are also available to stockholders without charge on the SEC’s website at www.sec.gov.

Form N-PORT

The Fund files its complete schedule of portfolio holdings for each month of each fiscal year with the SEC on Form N-PORT. The Fund’s Form N-PORT for the third month of each Fund’s fiscal quarter and statement of additional information are available without charge by visiting the SEC’s website at www.sec.gov. You may obtain information on the operation of the Public Reference Room by calling (800) SEC-0330.

Certifications

The Fund’s Chief Executive Officer has submitted to the New York Stock Exchange the annual CEO certification as required by Section 303A.12(a) of the NYSE Listed Fund Manual.

The Fund has filed with the SEC the certification of its Chief Executive Officer and Chief Financial Officer required by Section 302 of the Sarbanes-Oxley Act.

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Distribution and Dividend Reinvestment Plan

Unless the registered owner of common shares elects to receive cash by contacting the Plan Agent, all distributions declared for your common shares of the Fund (including capital gain distributions and return of capital distributions) will be automatically reinvested by U.S. Bank Global Fund Services (the “Plan Agent”), agent for shareholders in administering the Fund’s dividend reinvestment plan (the “Plan”), in additional common shares of the Fund. If a registered owner of common shares elects not to participate in the Plan, you will receive all distributions in cash paid by check mailed directly to you (or, if the shares are held in street or other nominee name, then to such nominee) by the Plan Agent, as distribution disbursing agent. You may elect not to participate in the Plan and to receive all distributions in cash by sending written instructions or by contacting the Plan Agent, as distribution disbursing agent, at the address set out below. Participation in the Plan is completely voluntary and may be terminated or resumed at any time without penalty by contacting the Plan Agent before the distribution record date; otherwise such termination or resumption will be effective with respect to any subsequently declared distribution. Some brokers may automatically elect to receive cash on your behalf and may reinvest that cash in additional common shares of the Fund for you.

Whenever the Fund declares a distribution payable in cash, non-participants in the Plan will receive cash and participants in the Plan will receive the equivalent in common shares. The common shares will be acquired by the Plan Agent for the participants’ accounts, depending upon the circumstances described below, either (i) through receipt of additional unissued but authorized common shares from the Fund (“newly-issued common shares”) or (ii) by purchase of outstanding common shares on the open market (“open-market purchases”) on the New York Stock Exchange or elsewhere.

If, on the payment date for any distribution, the market price per common share plus estimated brokerage commissions is greater than the net asset value per common share (such condition being referred to in this Report as “market premium”), the Plan Agent will invest the distribution amount in newly-issued common shares, including fractions, on behalf of the participants. The number of newly-issued common shares to be credited to each participant’s account will be determined by dividing the dollar amount of the distribution by the net asset value per common share on the payment date; provided that, if the net asset value per common share is less than 95% of the market price per common share on the payment date, the dollar amount of the distribution will be divided by 95% of the market price per common share on the payment date.

If, on the payment date for any distribution, the net asset value per common share is greater than the market value per common share plus estimated brokerage commissions (such condition being referred to in this Report as “market discount”), the Plan Agent will invest the distribution amount in common shares acquired on behalf of the participants in open-market purchases.

In the event of a market discount on the payment date for any distribution, the Plan Agent will have until the last business day before the next date on which the common shares trade on an “ex-distribution” basis or 120 days after the payment date for such distribution, whichever is sooner (the “last purchase date”), to invest the distribution amount in common shares acquired in open-market purchases. The period during which open-market purchases can be made will exist only from the payment date of each distribution through the date before the “ex-distribution” date of the following distribution. If, before the Plan Agent has completed its open-market purchases, the market price of a common share exceeds the net asset value per common share, the average per common share purchase price paid by the Plan Agent may exceed the net asset value of the common shares, resulting in the acquisition of fewer common shares than if the distribution had been paid in newly-issued common shares on the distribution payment date. Because of the foregoing difficulty with respect to open market purchases, if the Plan Agent is unable to invest the full distribution amount in open market purchases during the purchase period or if the market discount shifts to a market premium during the purchase period, the Plan Agent may cease making open-market purchases and may invest the uninvested portion of the distribution amount in newly-issued common shares at the net asset value per common share at the close of business on the

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last purchase date; provided that, if the net asset value per common share is less than 95% of the market price per common share on the payment date, the dollar amount of the distribution will be divided by 95% of the market price per common share on the payment date.

The Plan Agent maintains all shareholders’ accounts in the Plan and furnishes written confirmation of all transactions in the accounts, including information needed by shareholders for tax records. Common shares in the account of each Plan participant will be held by the Plan Agent on behalf of the Plan participant, and each shareholder proxy will include those shares purchased or received pursuant to the Plan. The Plan Agent or its designee will forward all proxy solicitation materials to participants and vote proxies for shares held under the Plan in accordance with the instructions of the participants.

In the case of shareholders such as banks, brokers or nominees which hold shares for others who are the beneficial owners, the Plan Agent will administer the Plan on the basis of the number of common shares certified from time to time by the record shareholder’s name and held for the account of beneficial owners who participate in the Plan.

There will be no brokerage charges with respect to common shares issued directly by the Fund. However, each participant will pay a pro rata share of brokerage commissions incurred in connection with open-market purchases. The automatic reinvestment of distributions will not relieve participants of any federal, state or local income tax that may be payable (or required to be withheld) on such distributions. Accordingly, any taxable distribution received by a participant that is reinvested in additional common shares will be subject to federal (and possibly state and local) income tax even though such participant will not receive a corresponding amount of cash with which to pay such taxes.

In addition, participants who request a sale of shares through the Plan Agent are subject to a $15.00 per transaction sales fee and pay a brokerage commission of $0.12 per share sold.

To the extent that reinvested distributions are invested in newly-issued common shares (which occurs when a market premium exists on the payment date for any distribution) the reinvestment of distributions will increase the Managed Assets of the Fund, and thus the Management Fee paid to the Investment Adviser.

The Fund reserves the right to amend or terminate the Plan. There is no direct service charge to participants in the Plan; however, the Fund reserves the right to amend the Plan to include a service charge payable by the participants. The Fund will provide written notice to participants at least 60 days in advance of implementing any such amendment.

For more information about the Plan you may contact the Plan Agent in writing at PO Box 708, Milwaukee, Wisconsin 53201-0701, or by calling the Plan Agent.

Privacy Policy

In order to conduct its business, the Fund collects and maintains certain nonpublic personal information about its stockholders of record with respect to their transactions in shares of the Fund’s securities. This information includes the stockholder’s address, tax identification or Social Security number, share balances, and dividend elections. We do not collect or maintain personal information about stockholders whose share balances of our securities are held in “street name” by a financial institution such as a bank or broker.

We do not disclose any nonpublic personal information about you, the Fund’s other stockholders or the Fund’s former stockholders to third parties unless necessary to process a transaction, service an account, or as otherwise permitted by law.

To protect your personal information internally, we restrict access to nonpublic personal information about the Fund’s stockholders to those employees who need to know that information to provide services to our stockholders. We also maintain certain other safeguards to protect your nonpublic personal information.

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Other Information for Stockholders

Notice is hereby given in accordance with Section 23(c) of the Investment Company Act of 1940, as amended, that the Fund from time to time may purchase its common shares of beneficial interest in the open market.

This report is sent to stockholders of NXG Cushing^® Midstream Energy Fund for their information. It is not a prospectus, circular or representation intended for use in the purchase or sale of shares of the Fund or of any securities mentioned in this report.

The Fund does not make available copies of its Statement of Additional Information because the Fund’s shares are not continuously offered, which means that the Statement of Additional Information has not been updated after completion of the Fund’s prior offerings and the information contained in such Statement of Additional Information may have become outdated.

The Fund makes available performance and certain other information on its website at www.nxgim.com. Investors and others are advised to periodically check the website for updated performance information and the release of other material information about the Fund. This reference to the Fund’s website is intended to allow investors public access to information regarding the Fund and does not, and is not intended to, incorporate the Fund’s website in this report.

Annual Shareholder Meeting Results

The annual meeting of shareholders of the Fund was held on July 10, 2026. The matters considered at the meeting, along with the vote tabulations relating to such matters were as follows:

To elect each of Mr. Brian R. Bruce and Mr. John H. Alban to serve as Class I Trustees of the Fund, to hold office until the Fund’s 2029 annual meeting or until his successor is elected and duly qualified; and

To approve a new investment advisory agreement between each Fund and the Adviser.

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On January 28, 2026, the Board of Trustees (the “Board,” members of which are referred to collectively as the “Trustees”) of the Fund met in person to discuss, among other things, the approval of the Investment Management Agreement (the “Agreement”) between the Adviser and the Fund.

Activities and Composition of the Board

The Board is comprised of four Trustees, three of whom are not “interested persons,” as such term is defined in the Investment Company Act of 1940, as amended (the “1940 Act”), of the Fund (the “Independent Trustees”). The Trustees are responsible for oversight of the operations of the Fund and perform the various duties imposed by the 1940 Act on the trustees of investment companies. The Independent Trustees have retained independent legal counsel to assist them in connection with their duties. Prior to its consideration of the Agreement, the Trustees received and reviewed information provided by the Adviser. The Trustees also received and reviewed information responsive to requests from independent counsel to assist it in its consideration of the Agreement. Before the Trustees voted on the approval of the Agreement, the Independent Trustees met with independent legal counsel during executive session and discussed the Agreement and related information.

Consideration of Nature, Extent and Quality of the Services

The Board received and considered information regarding the nature, extent and quality of services provided to the Fund under the Agreement, including the Adviser’s Form ADV and other background materials supplied by the Adviser.

The Board reviewed and considered the Adviser’s investment advisory personnel, its history, and the amount of assets currently under management by the Adviser. The Board also reviewed the research and decision-making processes used by the Adviser, including the methods adopted to seek to achieve compliance with the investment objectives, strategies, policies, and restrictions of the Fund.

The Board considered the background and experience of the Adviser’s management in connection with the Fund, including reviewing the qualifications, backgrounds and responsibilities of the management team members primarily responsible for the day-to-day portfolio management of the Fund and the extent of the resources devoted to research and analysis of the Fund’s actual and potential investments.

The Board also reviewed certain of the Adviser’s policies and procedures, including the Adviser’s Code of Ethics.

The Board determined that the nature, extent and quality of services to be rendered by the Adviser under the Agreement were adequate.

Consideration of Advisory Fees and the Cost of the Services

The Board considered the information they received comparing the Fund’s contractual annual advisory fee and overall expenses, to the extent available, with a peer group of competitor closed-end funds determined by FUSE Research Network LLC (“FUSE”). The Board discussed the funds contained in the peer groups and universes and the general methodology used by FUSE in preparing its report. The Board determined that because the Fund’s advisory fee waiver is a direct reduction of the advisory fee payable by the Fund and not sensitive to other fund operating expenses, the Board would use the Fund’s contractual advisory fee net of its contractual advisory fee waiver for the purposes of evaluating advisory fees and related costs of the services rendered to the Fund.

The Board determined that the peer group was small, consisting of only five funds (including the Fund), and that the Fund’s total net expense ratio (based on net assets under management (“AUM”)) of 2.70% and total net expense ratio (based on managed AUM) of 1.95% were each in the most expensive quartile with respect to its peer group, and the Fund’s contractual advisory fee of 1.25%, as reduced to 1.00% to account for the 0.25% contractual advisory fee waiver was equal to the median contractual advisory fee for its peer group.

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Consideration of Investment Performance

The Board noted that it regularly reviews the performance of the Fund throughout the year. The Board reviewed performance information provided by FUSE for periods ending November 30, 2025 comparing the performance of the Fund against its peer group over several time horizons, and using different performance metrics, including but not limited to the comparative performance of the Fund in terms of net asset value (NAV) and market price.

The Trustees noted that the Fund’s peer group was small, consisting of only five funds (including the Fund) for the one-year, three-year, five-year, and ten-year periods ended November 30, 2025. The Board determined that the Fund’s performance based on NAV was in the highest performing quartile for the one-year and ten-year periods, in the second highest performing quartile for the three-year period, and in the second lowest performing quartile for the five-year period. With respect to the Fund’s performance based on market price, the Board determined that the Fund’s performance was in the highest performing quartile over the one-year, three-year, and ten-year periods, and in the second highest performing quartile over the five-year period.

Consideration of Comparable Accounts

The Board reviewed the other accounts and investment vehicles managed by the Adviser and discussed the similarities and differences between these accounts and the Fund.

The Board determined that, bearing in mind the limitations of comparing different types of managed accounts and the different levels of service typically associated with such accounts, the fee structures applicable to the Adviser’s other clients employing a comparable strategy to the Fund was not indicative of any unreasonableness with respect to the advisory fees proposed to be payable by the Fund.

Consideration of Profitability

The Board received and considered a profitability analysis prepared by the Adviser, using a template developed in consultation with counsel to the Independent Trustees, that set forth the fees payable by the Fund under the Agreement and the expenses incurred by the Adviser in connection with the operation of the Fund. The Board used this analysis to evaluate the fairness of the profits realized and anticipated to be realized by the Adviser with respect to the Fund.

The Board noted that the Fund was profitable to the Adviser, both before and after distribution expenses. The Board determined that, with respect to the Fund, the profit to the Adviser was not unreasonable.

Consideration of Economies of Scale

The Board considered whether economies of scale in the provision of services to the Fund had been or would be passed along to the shareholders under the Agreement. The Board determined there were no material economies of scale accruing to the Adviser in connection with its relationship with the Fund.

Consideration of Other Benefits

The Board reviewed and considered any other incidental benefits derived or to be derived by the Adviser from its relationship with the Fund, including but not limited to soft dollar arrangements. The Board determined there were no material incidental benefits accruing to the Adviser in connection with its relationship with the Fund.

Conclusion

In approving the Agreement and the fees charged under the Agreement, the Board concluded that no single factor reviewed by the Board was identified by the Board to be determinative as the principal factor in whether to approve the Agreement. The summary set out above describes the most important factors, but not all matters, considered by the Board in coming to its decision regarding the Agreement. On the basis of such information as the Board considered necessary to the exercise of its reasonable business judgment and its evaluation of all of the factors described above, and after much discussion, the Board concluded that each factor they considered, in the context of all of the other factors they considered, favored approval of the Agreement. It was noted that it was the judgment of the Board that approval of the Agreement was consistent with the best interests of the Fund and its shareholders.

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NOT FDIC INSURED | NOT BANK GUARANTEED | MAY LOSE VALUE

Item 2. Code of Ethics.

Not applicable for semi-annual reports.

Item 3. Audit Committee Financial Expert.

Not applicable for semi-annual reports.

Item 4. Principal Accountant Fees and Services.

Not applicable for semi-annual reports.

Item 5. Audit Committee of Listed Registrants.

Not applicable for semi-annual reports.

Item 6. Investments.

Item 7. Financial Statements and Financial Highlights for Open-End Management Investment Companies.

Not applicable to closed-end management investment companies.

Item 8. Changes in and Disagreements with Accountants for Open-End Management Investment Companies.

Not applicable to closed-end management investment companies.

Item 9. Proxy Disclosure for Open-End Management Investment Companies.

Not applicable to closed-end management investment companies.

Item 10. Remuneration Paid to Directors, Officers, and Others of Open-End Management Investment Companies.

Not applicable to closed-end management investment companies.

Item 11. Statement Regarding Basis for Approval of Investment Advisory Contract.

See Item 1(a).

Item 12. Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies.

Not applicable for semi-annual reports.

Item 13. Portfolio Managers of Closed-End Management Investment Companies.

Not applicable for semi-annual reports.

Item 14. Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers.

Item 15. Submission of Matters to a Vote of Security Holders.

Not Applicable.

Item 16. Controls and Procedures.

Item 17. Disclosure of Securities Lending Activities for Closed-End Management Investment Companies

The registrant did not engage in securities lending activities during the fiscal period reported on this Form N-CSR.

Item 18. Recovery of Erroneously Awarded Compensation.

(a) Not Applicable.

(b) Not Applicable.

Item 19. Exhibits.

(2) Any policy required by the listing standards adopted pursuant to Rule 10D-1 under the Exchange Act (17 CFR 240.10D-1) by the registered national securities exchange or registered national securities association upon which the registrant’s securities are listed. Not Applicable.

(3) A separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2(a) under the Investment Company Act of 1940 (17 CFR 270.30a-2(a)). Filed herewith.

(4) Any written solicitation to purchase securities under Rule 23c-1 under the Act sent or given during the period covered by the report by or on behalf of the registrant to 10 or more persons. Not Applicable.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

ATTACHMENTS / EXHIBITS

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fp0099345-3_ex99906cert.htm

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