Company: RFMZ
Filing Date: 2025-05-21
Form Type: 424B5
Source: 0001398344-25-009954
Chunk: 95

Company: RiverNorth Flexible Municipal Income Fund II, Inc.
Filing Date: 2025-05-21
Form: 424B5
Chunk 95
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-7185</div>

You should rely only on the information incorporated by reference or provided in the Fund’s Prospectus, SAI and any supplement thereto. We have not authorized anyone to provide you with different or additional information, and you should not rely on such information if you receive it. We are not making an offer of or soliciting an offer to buy, any securities in any state or other jurisdiction where such offer or sale is not permitted. You should not assume that the information in this Prospectus or in the documents incorporated by reference is accurate as of any date other than the date on the front of this Prospectus or those documents.

<div align='center'>55

Up to 4,000,000 Shares of Common Stock

RiverNorth Flexible Municipal Income Fund II, Inc.

PROSPECTUS SUPPLEMENT

May 20, 2025</div>

Until June 14, 2025 (25 days after the date of this prospectus supplement), all dealers that effect transactions in these securities, whether or not participating in this offering, may be required to deliver a prospectus. This is in addition to the dealers’ obligation to deliver a prospectus when acting as underwriters.