Company: SRV
Filing Date: 2025-11-17
Form Type: 424B2
Source: 0001398344-25-021029
Chunk: 9

Company: NXG Cushing Midstream Energy Fund
Filing Date: 2025-11-17
Form: 424B2
Chunk 9
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. Information contained on the Fund’s website is not incorporated by reference into
this Prospectus Supplement or the accompanying Prospectus and should not be considered to be part of this Prospectus Supplement or the
accompanying Prospectus.

| vii |

<div align='center'>INCORPORATION BY REFERENCE</div>

This Prospectus Supplement and the accompanying Prospectus is part of a
registration statement that the Fund has filed with the SEC. The Fund is permitted to “incorporate by reference” the information
that it files with the SEC, which means that the Fund can disclose important information to you by referring you to those documents. The
information incorporated by reference is an important part of this Prospectus, and later information that the Fund files with the SEC
will automatically update and supersede this information.

The documents listed below, and any reports and other documents subsequently
filed with the SEC pursuant to Rule 30(b)(2) under the 1940 Act and Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act,
prior to the termination of the offering, are incorporated by reference into this Prospectus Supplement and the accompanying Prospectus
and deemed to be part of this Prospectus and the accompanying Prospectus from the date of the filing of such reports and documents:

| ● | the Fund’s description of Common Shares contained in its Registration Statement on Form 8-A (File No. 001-33641) filed 
 with the SEC on August 2, 2007.                                                                                        |

To obtain copies of these filings, see “Where You Can Find More Information.”

| viii |

| PROSPECTUS SUPPLEMENT SUMMARY                                                                                                            
 This is only a summary of information                                                                                                    
 contained elsewhere in this Prospectus Supplement and the accompanying Prospectus. This summary does not contain all of the information  
 that you should consider before investing in the Fund’s Common Shares. You should carefully read the more detailed information contained 
 in this Prospectus Supplement and the accompanying Prospectus and the Statement of Additional Information, dated November 12, 2025       
 (the “SAI”), especially the information set forth under the headings “Investment Objective and Policies” and “Risks.”                    |                                                                                                                                                 |
|:-----------------------------------------------------------------------------------------------------------------------------------------|:------------------------------------------------------------------------------------------------------------------------------------------------|
| The Fund                                                                                                                                 | NXG Cushing® Midstream Energy Fund (the “Fund”)                                                                                                 
 is a non-diversified, closed-end management investment company registered under the 1940 Act that commenced investment operations