Company: MSEX
Filing Date: 2025-05-12
Form Type: 424B5
Source: 0001104659-25-047381
Chunk: 1

Company: MIDDLESEX WATER CO
Filing Date: 2025-05-12
Form: 424B5
Chunk 1
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 our common stock by notifying the other party.

We will pay each sales agent
a commission of up to 2% of the gross sales price per share of common stock sold through such agent under the ATM Equity Offering Sales
Agreement. We have also agreed to reimburse the Agents for certain of their expenses. In connection with the sale of the shares of common
stock on our behalf, each of the Agents may be deemed to be an “underwriter” within the meaning of the Securities Act of 1933,
as amended, or the Securities Act, and the compensation paid to each of the Agents may be deemed to be underwriting commissions or discounts.
See “Plan of Distribution.”

Settlement of any sales of
common stock will occur on the first business day following the date on which such sales were made. There is no arrangement for funds
to be received in an escrow, trust or similar arrangement. Sales of our common stock as contemplated in this prospectus supplement will
be settled through the facilities of The Depository Trust Company or by such other means as we and the sales agents may agree.

Investing in Middlesex Common Stock involves a high degree of risk. Before making a decision to invest in Middlesex Common Stock, you should carefully consider the risks described in Part I, Item 1A of the Company’s most recent Annual Report on Form 10-K (“Form 10-K”) under the heading “Risk Factors,” and under the headings “Risk Factors” of this prospectus supplement and the accompanying prospectus. The Form 10-K and the Company’s most recent Quarterly Report on Form 10-Q (“Form 10-Q”) are incorporated by reference in this prospectus supplement and the accompanying prospectus.

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Neither the Securities and Exchange Commission (“SEC”) nor any other regulatory body has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus supplement or the related prospectus. Any representation to the contrary is a criminal offense.

No person has been authorized to give any information or to make any representations other than those contained in this prospectus supplement. If any other information or representations are given or made, you must not rely on them as having been authorized.

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| BofA Securities | Baird | Janney Montgomery Scott |

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This Prospectus Supplement is dated May 12,
2025

TABLE OF CONTENTS

Prospectus Supplement</