Company: SRV
Filing Date: 2025-11-17
Form Type: 424B2
Source: 0001398344-25-021029
Chunk: 6

Company: NXG Cushing Midstream Energy Fund
Filing Date: 2025-11-17
Form: 424B2
Chunk 6
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                                                              |        |
| Prospectus Summary                                                      |      1 |
| Summary of Fund Expenses                                                |      7 |
| Financial Highlights                                                    |      9 |
| Senior Securities                                                       |     11 |
| The Fund                                                                |     12 |
| Use of Proceeds                                                         |     12 |
| Market and Net Asset Value Information                                  |     12 |
| Investment Objective and Policies                                       |     12 |
| Use of Leverage                                                         |     12 |
| Risks                                                                   |     13 |
| Management of the Fund                                                  |     15 |
| Net Asset Value                                                         |     15 |
| Distributions                                                           |     15 |
| Dividend Reinvestment Plan                                              |     16 |
| Description of Shares                                                   |     16 |
| Anti-Takeover Provisions in the Declaration of Trust                    |     20 |
| Certain Provisions of Delaware Law, the Declaration of Trust and Bylaws |     21 |
| Closed-End Fund Structure                                               |     24 |
| Repurchase of Common Shares                                             |     25 |
| U.S. Federal Income Tax Considerations                                  |     25 |
| Plan of Distribution                                                    |     27 |
| Other Service Providers                                                 |     29 |
| Legal Matters                                                           |     30 |
| Independent Registered Public Accounting Firm                           |     30 |
| Privacy Policy                                                          |     30 |
| Table of Contents of the Statement of Additional Information            |    S-1 |

| v |

<div align='center'>ABOUT THIS PROSPECTUS SUPPLEMENT</div>

This document has two parts. The first part is this Prospectus Supplement,
which describes the terms of the Offer. The second part is the accompanying Prospectus, which contains more general information about
the securities that the Fund may offer from time to time, some of which may not apply to this Offer. If information in this Prospectus
Supplement is inconsistent with the accompanying Prospectus, you should rely on this Prospectus Supplement. You should carefully read
this Prospectus Supplement and the accompanying Prospectus, together with the additional information described under the heading “Where
You Can Find More Information.”

This Prospectus Supplement and the accompanying Prospectus and the SAI,
contain (or will contain) or incorporate (or will incorporate) by reference forward-looking statements, within the meaning of the federal
securities laws, that involve risks and uncertainties. These statements describe the Fund’s plans, strategies, and goals and the
Fund’s beliefs and assumptions