Company: SFNC
Filing Date: 2025-09-10
Form Type: 424B5
Source: 0001193125-25-200113
Chunk: 38

Company: SIMMONS FIRST NATIONAL CORP
Filing Date: 2025-09-10
Form: 424B5
Chunk 38
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 Benchmark (or any successor administrator), on the Federal Reserve Bank of New York’s website.

“Term SOFR” means the forward-looking term rate for the applicable Corresponding Tenor based on SOFR as published by the Term SOFR
Administrator.

“Term SOFR Administrator” means CME Group Benchmark Administration Limited (CBA) (or a successor administrator
of Three-Month Term SOFR selected by the calculation agent in its reasonable discretion).

“Three-Month Term SOFR Conventions”
means any determination, decision, or election with respect to any technical, administrative, or operational matter (including with respect to the manner and timing of the publication of Three-Month Term SOFR, or changes to the definition of
“interest period,” timing and frequency of determining Three-Month Term SOFR with respect to each interest period and making payments of interest, rounding of amounts or tenors, and other administrative matters) that the calculation
agent determines may be appropriate to reflect the use of Three-Month Term SOFR as the Benchmark in a manner substantially consistent with market practice (or, if the calculation agent determines that adoption of any portion of such market practice
is not administratively feasible or if the calculation agent determines that no market practice for the use of Three-Month Term SOFR exists, in such other manner as the calculation agent determines is reasonably necessary).

The terms “Benchmark Replacement Conforming Changes,” “Benchmark Replacement Date,” “Benchmark
Replacement,” “Benchmark Replacement Adjustment,” and “Benchmark Transition Event” have the meanings set forth under the heading “— Effect of Benchmark Transition Event.”

Notwithstanding the foregoing paragraphs related to the determination of interest, if the calculation agent determines on or prior to the
relevant Reference Time that a Benchmark Transition Event and its related Benchmark Replacement Date (each as defined below) have occurred with respect to Three-Month Term SOFR, then the provisions set forth under the heading “— Effect
of Benchmark Transition Event,” which we refer to as

S-25

the “benchmark transition provisions,” will thereafter apply to all determinations of the interest rate on the Notes for each interest period during the floating rate period. In
accordance with the benchmark transition provisions, after a Benchmark Transition Event and its related Benchmark Replacement Date have occurred, the interest rate on the Notes for each interest period during the floating rate period will be an
annual rate equal to the Benchmark Replacement (as defined below) plus 302 basis points.

Absent manifest error, the calculation
agent’s determination of the interest rate for an interest period