Company: SRV
Filing Date: 2025-11-17
Form Type: 424B2
Source: 0001398344-25-021029
Chunk: 163

Company: NXG Cushing Midstream Energy Fund
Filing Date: 2025-11-17
Form: 424B2
Chunk 163
---
, and up to 36 months for obligations in U.S. public finance markets.

F1: Highest short-term credit quality.Indicates the strongest intrinsic capacity for timely payment of financial commitments; may have an added “+”
to denote any exceptionally strong credit feature.

<div align='center'>A-9</div>

F2: Good short-term credit quality.Good intrinsic capacity for timely payment of financial commitments.

F3: Fair short-term credit quality.The intrinsic capacity for timely payment of financial commitments is adequate.

B: Speculative short-term credit quality.Minimal capacity for timely payment of financial commitments, plus heightened vulnerability to near term adverse changes
in financial and economic conditions.

C: High short-term default risk.Default is a real possibility.

RD: Restricted default.Indicates an entity that has defaulted on one or more of its financial commitments, although it continues to meet other financial
obligations. Applicable to entity ratings only.

D: Default.Indicates
a broad-based default event for an entity, or the default of a short-term obligation.

Limitations of the Short-Term Ratings Scale:

Specific limitations relevant
to the Short-Term Ratings scale include:

| ● | The ratings do not predict a specific                        
 percentage of default likelihood over any given time period. |

| ● | The ratings do not opine on the market                                                   
 value of any issuer’s securities or stock, or the likelihood that this value may change. |

| ● | The ratings do not opine on the liquidity 
 of the issuer’s securities or stock.      |

| ● | The ratings do not opine on the possible                     
 loss severity on an obligation should an obligation default. |

| ● | The ratings do not opine on any quality                                       
 related to an issuer or transaction’s profile other than the agency’s opinion 
 on the relative vulnerability to default of the rated issuer or obligation.   |

Ratings assigned by Fitch
Ratings articulate an opinion on discrete and specific areas of risk. The above list is not exhaustive, and is provided for the reader’s
convenience.

<div align='center'>A-10</div>

Appendix B

PROXY VOTING POLICY AND PROCEDURES

Cushing Asset
Management, LP (the “Investment Manager”) serves as the investment adviser and general partner, respectively, of certain the
investment accounts and pooled investment (each a “Client” and collectively, the “Clients”). Through these relationships
the Investment Manager is sometimes delegated the right to vote, on