Company: SRV
Filing Date: 2025-01-14
Form Type: 424B2
Source: 0001398344-25-000635
Chunk: 4

Company: NXG Cushing Midstream Energy Fund
Filing Date: 2025-01-14
Form: 424B2
Chunk 4
---
 Fund
(including the Fund’s annual and semi-annual reports) or make shareholder inquiries by calling (214) 692-6334 or by writing the
Fund, or you may obtain a copy (and other information regarding the Fund) from the SEC’s website (www.sec.gov). Free copies of the
Fund’s Prospectus, SAI, reports and any incorporated information will also be available from the Fund’s website at www.nxgim.com.

| iii |

The Fund’s Common Shares do not represent a deposit
or obligation of, and are not guaranteed or endorsed by, any bank or other insured depository institution and are not federally insured
by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency.

Capitalized terms used herein that are not otherwise
defined shall have the meanings assigned to them in the accompanying Prospectus.

| iv |

<div align='center'>TABLE OF CONTENTS</div>

|                                                                                       | Page |
| Prospectus Supplement                                                                 |      |
| About this Prospectus Supplement                                                      |   ii |
| Where You Can Find More Information                                                   |  iii |
| Incorporation By Reference                                                            |   iv |
| Prospectus Supplement Summary                                                         |  S-1 |
| Summary of Fund Expenses                                                              |  S-4 |
| Capitalization                                                                        |  S-6 |
| Use of Proceeds                                                                       |  S-7 |
| Market and Net Asset Value Information                                                |  S-7 |
| Recent Developments                                                                   |  S-8 |
| Risks                                                                                 |  S-9 |
| Plan of Distribution                                                                  | S-10 |
| Legal Matters                                                                         | S-11 |
| Prospectus                                                                            |      |
| Prospectus Summary                                                                    |    1 |
| Summary of Fund Expenses                                                              |   23 |
| Financial Highlights                                                                  |   24 |
| Senior Securities                                                                     |   28 |
| The Fund                                                                              |   29 |
| Use of Proceeds                                                                       |   29 |
| Market and Net Asset Value Information                                                |   29 |
| Investment Objective and Policies                                                     |   30 |
| Use of Leverage                                                                       |   37 |
| Risks                                                                                 |   39 |
| Management of the Fund                                                                |   63 |
| Net Asset Value                                                                       |   64 |
| Distributions                                                                         |   65 |
| Dividend Reinvestment Plan                                                            |   66 |
| Description of Shares                                                                 |   68 |
| Anti-Takeover Provisions in the Agreement and Declaration of