Company: SFNC
Filing Date: 2025-09-10
Form Type: 424B5
Source: 0001193125-25-200113
Chunk: 70

Company: SIMMONS FIRST NATIONAL CORP
Filing Date: 2025-09-10
Form: 424B5
Chunk 70
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 other U.S. federal tax laws (such as the estate or gift tax laws) or under the laws of any state, local, foreign or other taxing jurisdiction or under any applicable tax treaty. U.S. Holders This subsection describes the tax considerations for a “U.S. holder.” You are a “U.S. holder” if you are a beneficial owner of a Note and you are:

| • |     | an individual citizen or resident of the United States; |

| • |     | a corporation (or other entity treated as a corporation for U.S. federal income tax purposes) created or 
 organized in or under the laws of the United States, any state thereof, or the District of Columbia;     |

| • |     | an estate the income of which is subject to U.S. federal income tax regardless of its source; or |

| • |     | a trust that (1) is subject to the supervision of a court within the United States if one or more                                                                                                                             
 “United States persons” (as defined in the Code) have the authority to control all substantial decisions of the trust, or (2) has a valid election in effect under applicable Treasury Regulations to be treated as a “United 
 States person.”                                                                                                                                                                                                               |

Payments of interest and original issue discount. Based on the interest rate characteristics of the Notes, we intend to treat the Notes as “variable rate debt instruments” (“VRDIs”) for U.S. federal income tax purposes and this discussion assumes such characterization to be correct. Under applicable Treasury Regulations, to determine the amount of “qualified stated interest” (“QSI”) and original issue discount (“OID”) in respect of a variable rate debt instrument, an “equivalent fixed rate debt instrument” must be constructed. The equivalent fixed rate debt instrument of a variable rate debt instrument that has an initial fixed rate followed by one or more qualified floating rates, such as a Note, is constructed as follows: (i) first, the initial fixed rate is replaced with a qualified floating rate such that the fair market value of a Note as of the Note’s issue date would be approximately the same as the fair market value of an otherwise identical debt instrument that provides for the replacement qualified floating rate rather than the fixed rate, and (ii) second, each floating rate (including the floating rate determined under clause (i) of this paragraph) is converted into a fixed rate substitute (which, in each case, generally will be the value of each floating rate as of the issue date of the Notes).