Company: MSEX
Filing Date: 2025-05-12
Form Type: 424B5
Source: 0001104659-25-047381
Chunk: 0

Company: MIDDLESEX WATER CO
Filing Date: 2025-05-12
Form: 424B5
Chunk 0
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Filed Pursuant to Rule 424(b)(5)

Registration Statement No. 333-287177

PROSPECTUS SUPPLEMENT

(To Prospectus Dated May 12, 2025)

<div align='center'>Up to $110,000,000 of Common Stock</div>

This prospectus supplement
relates to shares of common stock, no par value (“Middlesex Common Stock”), of Middlesex Water Company (“Middlesex”
or the “Company”). Middlesex has entered into an ATM Equity Offering Sales Agreement with BofA Securities, Inc., Robert
W. Baird & Co. Incorporated and Janney Montgomery Scott LLC as our sales agents (collectively, the “Agents”), under
which we may offer and sell from time to time our common stock having an aggregate offering price of up to $110,000,000. The Agents may
act as agents on our behalf or purchase share of our common stock as principal.

Middlesex Common Stock is
listed on the NASDAQ Global Select Market under the symbol “MSEX.” On May 9, 2025 the closing price of Middlesex Common
Stock on the NASDAQ Global Select Market was $60.09 per share.

Sales, if any, of common stock
under the ATM Equity Offering Sales Agreement may be made in ordinary brokers’ transactions, to or through a market maker, on or
through the Nasdaq Global Select Market or any other market venue where our common stock may be traded, in the over-the-counter market,
in privately negotiated transactions, in block trades, in transactions that are deemed to be “at the market offerings” as
defined in Rule 415 under the Securities Act or through a combination of any such methods of sale. The sales agents may also sell
our common stock by any other method permitted by law.

We will designate the maximum
amount of common stock to be sold through the sales agents on a daily basis or otherwise as we and the sales agents agree and the minimum
price per share at which such common stock may be sold. Subject to the terms and conditions of the ATM Equity Offering Sales Agreement,
the sales agents will use their reasonable efforts consistent with their normal sales and trading practices to sell on our behalf all
of the designated shares of common stock. We may instruct the sales agents not to sell any common stock if the sales cannot be effected
at or above the price designated by us in any such instruction. We or any sales agent, with respect to itself only, may suspend the offering
of