Company: SRV
Filing Date: 2025-03-10
Form Type: PRE 14A
Source: 0001398344-25-005333
Chunk: 0

Company: NXG Cushing Midstream Energy Fund
Filing Date: 2025-03-10
Form: PRE 14A
Chunk 0
---
<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934
(Amendment No. )</div>

Filed by the Registrant [X]
Filed by a Party other than the Registrant[ ]

Check the appropriate box:

| [X]   | Preliminary Proxy Statement                                                     |
| [   ] | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| [   ] | Definitive Proxy Statement                                                      |
| [   ] | Definitive Additional Materials                                                 |
| [   ] | Soliciting Material Pursuant to §240.14a-12                                     |

<div align='center'>NXG Cushing ®Midstream Energy Fund

(Exact Name of Registrant as Specified in its Charter)

(Name of Person(s) Filing Proxy Statement, if other
than the Registrant)</div>

Payment of Filing Fee (Check the appropriate box):

| [X]   | No fee required.                                                         |
| [   ] | Fee paid previously with preliminary materials.                          |
| [   ] | Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11. |

<div align='center'>NXG CUSHING® MIDSTREAM ENERGY FUND (NYSE: SRV)

NXG NEXTGEN INFRASTRUCTURE INCOME FUND (NYSE: NXG)

One Energy Square
4925 Greenville Ave., Suite 1310

Dallas, Texas 75206</div>

[ ], 2025

Dear Shareholder:

You are cordially invited to participate in the 2025
Joint Annual Meeting of Shareholders (the “Annual Meeting”) of each of NXG Cushing Midstream Energy Fund (“”)
and NXG NextGen Infrastructure Income Fund (“” and, together with SRV, the “” and each a
“”), to be held on May 22, 2025, at 9:00 A.M. (Central time), to consider and vote on the proposals discussed
in the enclosed Proxy Statement. The Annual Meeting will be held at the offices of the Funds, One Energy Square, 4925 Greenville Ave.,
Suite 1310, Dallas, Texas 75206

The Notice of Annual Meeting and Proxy Statement enclosed
with this letter