Company: RFMZ
Filing Date: 2025-05-21
Form Type: 424B5
Source: 0001398344-25-009954
Chunk: 7

Company: RiverNorth Flexible Municipal Income Fund II, Inc.
Filing Date: 2025-05-21
Form: 424B5
Chunk 7
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 could materially affect the Fund’s
actual results are the performance of the portfolio of securities the Fund holds, the price at which the Fund’s Common Shares will
trade in the public markets and other factors discussed in the Fund’s periodic filings with the SEC. Currently known risk factors
that could cause actual results to differ materially from the Fund’s expectations include, but are not limited to, the factors described
in the “Risks” section of the accompanying Prospectus. The Fund urges you to review carefully that section for a more detailed
discussion of the risks of an investment in the Fund’s securities.

Although the Fund believes that
the expectations expressed in the Fund’s forward-looking statements are reasonable, actual results could differ materially from
those projected or assumed in the Fund’s forward-looking statements. The Fund’s future financial condition and results of
operations, as well as any forward-looking statements, are subject to change and are subject to inherent risks and uncertainties, such
as those disclosed in the “Risks” section of the accompanying Prospectus. All forward-looking statements contained or incorporated
by reference in this Prospectus Supplement or the accompanying Prospectus are made as of the date of this Prospectus Supplement or the
accompanying Prospectus, as the case may be. Except for the Fund’s ongoing obligations under the federal securities laws, the Fund
does not intend, and the Fund undertakes no obligation, to update any forward-looking statement.

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<div align='center'>PROSPECTUS SUPPLEMENT SUMMARY</div>

This is only a summary of information contained elsewhere in this Prospectus Supplement and the accompanying Prospectus. This summary does not contain all of the information that you should consider before investing in the Fund’s securities offered by this Prospectus Supplement. You should carefully read the more detailed information contained in this Prospectus Supplement and the accompanying Prospectus and the statement of additional information (“SAI”), dated April 15, 2025, especially the information set forth under the heading “Risks.”

The Fund

RiverNorth Flexible Municipal
Income Fund II, Inc. (the “Fund”) is a Maryland corporation registered as a diversified, closed-end management investment
company under the Investment Company Act of 1940, as amended (the “1940 Act”). As used hereinafter in this Prospectus Supplement,
unless the context otherwise requires, “Common Shares” refer to the Fund's shares of common stock, $0.0001 par value per share,
currently outstanding as well as those shares offered by this Prospect