Company: SRV
Filing Date: 2025-11-17
Form Type: 424B2
Source: 0001398344-25-021029
Chunk: 152

Company: NXG Cushing Midstream Energy Fund
Filing Date: 2025-11-17
Form: 424B2
Chunk 152
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 the obligation.

<div align='center'>A-2</div>

BA short-term obligation
rated ‘B’ is regarded as vulnerable and has significant speculative characteristics. The obligor currently has the capacity
to meet its financial commitments; however, it faces major ongoing uncertainties which could lead to the obligor’s inadequate capacity
to meet its financial commitments.

C A short-term obligation
rated ‘C’ is currently vulnerable to nonpayment and is dependent upon favorable business, financial, and economic conditions
for the obligor to meet its financial commitment on the obligation.

DA short-term obligation
rated ‘D’ is in payment default. The ‘D’ rating category is used when payments on an obligation are not made on
the date due, unless Standard & Poor’s believes that such payments will be made within any stated grace period. However, any
stated grace period longer than five business days will be treated as five business days. The ‘D’ rating also will be used
upon the filing of a bankruptcy petition or the taking of a similar action if payments on an obligation are jeopardized.

SPUR (S&Ps Underlying
Rating) A SPUR rating is a rating of a stand-alone capacity of an issue to pay debt service on a credit-enhanced debt issue, without giving
effect to the enhancement that applies to it. These ratings are published only at the request of the debt issuer/obligor with the designation
SPUR to distinguish them from the credit-enhanced rating that applies to the debt issue. S&P maintains surveillance of an issue with
a published SPUR.

Municipal Short-Term Note
Ratings Definitions

A S&P’s U.S. Municipal
note rating reflects S&P’s opinion about the liquidity factors and market access risks unique to the notes. Notes due in three
years or less will likely receive a note rating. Notes with an original maturity of more than three years will most likely receive a long-term
debt rating. In determining which type of rating, if any, to assign, S&P’s analysis will review the following considerations:

| ● | Amortization schedule — the                                                                
 larger the final maturity relative to other maturities, the more likely it will be treated 
 as a note; and                                                                             |

| ● | Source of payment — the more                                                                 
 dependent the issue is on the market for its refinancing, the more likely it will be treated 
 as a note.                                                                                   |

Note rating symbols are as
follows:

SP-1 Strong