Company: MSEX
Filing Date: 2025-05-12
Form Type: 424B5
Source: 0001104659-25-047381
Chunk: 23

Company: MIDDLESEX WATER CO
Filing Date: 2025-05-12
Form: 424B5
Chunk 23
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<div align='center'>THIS PROSPECTUS SUPPLEMENT SHOULD BE RETAINED BY INVESTORS FOR FUTURE REFERENCE.

S-19</div>

PROSPECTUS

<div align='center'>Middlesex Water Company

CommonStock</div>

From time to time, we may
offer, issue and sell shares of our Common Stock in one or more offerings.

This prospectus provides a
general description of the securities we may offer. When we offer securities, we will provide specific terms of the securities offered
in a supplement to this prospectus. We may also authorize one or more free writing prospectuses to be provided to you in connection with
these offerings. The prospectus supplement and any related free writing prospectus may also add, update or change information contained
in this prospectus. You should carefully read this prospectus, the applicable prospectus supplement and any related free writing prospectus,
as well as any documents incorporated by reference, before you invest in any of the securities being offered.

Our Common Stock is traded
on The NASDAQ Global Select Market under the symbol “MSEX”.

We may offer and sell our
securities to or through one or more agents, underwriters, dealers or other third parties or directly to one or more purchasers on a continuous
or delayed basis or through a combination of such methods. See “Plan of Distribution” on page 12. If agents, underwriters
or dealers are used to sell our securities, we will name them and describe their compensation in a prospectus supplement. If any agents,
underwriters or dealers are involved in the sale of any of the securities, their names, and any applicable purchase price, fee, commission
or discount arrangements between or among them, will be set forth, or will be calculable from the information set forth, in the applicable
prospectus supplement.

Investing in our securities involves certain risks. You should carefully review the risks and uncertainties referenced under the heading “Risk Factors” on page 3 of this prospectus as well as those contained in the applicable prospectus supplement and any related free writing prospectus, and in the other documents that are incorporated by reference into this prospectus or the applicable prospectus supplement.

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIM