Company: SRV
Filing Date: 2025-11-17
Form Type: 424B2
Source: 0001398344-25-021029
Chunk: 147

Company: NXG Cushing Midstream Energy Fund
Filing Date: 2025-11-17
Form: 424B2
Chunk 147
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 the 1940 Act and in accordance therewith files, or will file,
reports and other information with the SEC. The SEC maintains a web site at www.sec.gov containing reports, proxy and information statements
and other information regarding registrants, including the Fund, that file electronically with the SEC.

This Statement of Additional Information constitutes
part of a Registration Statement filed by the Fund with the SEC under the Securities Act, and the 1940 Act. This Statement of Additional
Information omits certain of the information contained in the Registration Statement, and reference is hereby made to the Registration
Statement and related exhibits for further information with respect to the Fund and the securities offered hereby. Any statements contained
herein concerning the provisions of any document are qualified, in each instance, by reference to the copy of such document filed as
an exhibit to the Registration Statement or otherwise filed with the SEC. The complete Registration Statement may be obtained from the
SEC free of charge through the SEC’s website (www.sec.gov).

<div align='center'>S-25</div>

The Fund will provide without charge to each
person, including any beneficial owner, to whom this SAI is delivered, upon written or oral request, a copy of any and all of the information
that has been incorporated by reference in this SAI, the Prospectus or any accompanying Prospectus Supplement. You may request such information by
calling (888) 777-2346, or by writing to the Fund at One Energy Square, 4925 Greenville Avenue, Suite 1310, Dallas, Texas 75206, or you
may obtain a copy (and other information regarding the Fund) from the SEC’s website (www.sec.gov).

Incorporation by Reference

This Statement of Additional Information 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 Statement of Additional Information, 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,