BlackRock boosts stake in Middlesex Water (MSEX) to 16.1% in Schedule 13G/A

Rhea-AI Filing Summary

BlackRock, Inc. files Amendment No. 20 to Schedule 13G/A reporting beneficial ownership of 2,981,660 shares of Middlesex Water Co Common Stock, representing 16.1% of the class. The filing states BlackRock has sole voting power over 2,941,007 shares and sole dispositive power over 2,981,660 shares. The filing notes iShares Core S&P Small-Cap ETF holds an interest exceeding five percent. The report is signed by Spencer Fleming, Managing Director, dated 04/24/2026.

Insights

Institutional Ownership Analyst

BlackRock reports a substantial passive stake: 2,981,660 shares, 16.1%.

BlackRock's Schedule 13G/A shows beneficial ownership of 2,981,660 shares with sole voting power over 2,941,007 shares. The filing is an ownership disclosure under the Investment Company Act reporting framework.

Because the filing is a passive ownership disclosure, the entry is routine; subsequent filings would show any change in status or voting intent.

Key Figures

Beneficial ownership: 2,981,660 shares Percent of class: 16.1% Sole voting power: 2,941,007 shares +2 more

5 metrics

Beneficial ownership 2,981,660 shares Amount beneficially owned as reported in Item 4(a)

Percent of class 16.1% Percent of common stock as reported in Item 4(b)

Sole voting power 2,941,007 shares Sole power to vote as reported in Item 4(c)(i)

Sole dispositive power 2,981,660 shares Sole power to dispose as reported in Item 4(c)(iii)

Signing date 04/24/2026 Signature date for the amendment

Key Terms

Schedule 13G/A, beneficial ownership, sole dispositive power

3 terms

Schedule 13G/A regulatory

"Amendment No. 20 to Schedule 13G/A reporting beneficial ownership"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

beneficial ownership financial

"Amount beneficially owned: 2981660 (b) Percent of class: 16.1 %"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

sole dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 2981660"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 20)

MIDDLESEX WATER CO

(Name of Issuer)

Common Stock

(Title of Class of Securities)

596680108

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 596680108

1

Names of Reporting Persons

BlackRock, Inc.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 2,941,007.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,981,660.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,981,660.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

16.1 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: MIDDLESEX WATER CO
(b)	Address of issuer's principal executive offices: 485C ROUTE 1 SOUTH SUITE 400 ISELIN NJ 08830
Item 2.
(a)	Name of person filing: BlackRock, Inc. In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the "Reporting Business Units") of BlackRock, Inc. and its subsidiaries and affiliates. It does not include securities, if any, beneficially owned by other business units whose beneficial ownership of securities are disaggregated from that of the Reporting Business Units in accordance with such release.
(b)	Address or principal business office or, if none, residence: BlackRock, Inc., 50 Hudson Yards New York, NY 10001
(c)	Citizenship: See Item 4 of Cover Page
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 596680108
Item 4.	Ownership
(a)	Amount beneficially owned: 2981660
(b)	Percent of class: 16.1 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 2941007
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 2981660
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. The interest of 1 such person, iShares Core S&P Small-Cap ETF, in the common stock of MIDDLESEX WATER CO is more than five percent of the total outstanding common stock.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Exhibit 99
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

BlackRock, Inc.

Signature:	Spencer Fleming
Name/Title:	Managing Director
Date:	04/24/2026

Exhibit Information

Exhibit 24: Power of Attorney Exhibit 99: Item 7

FAQ

What stake does BlackRock hold in Middlesex Water (MSEX)?

BlackRock beneficially owns 2,981,660 shares, representing 16.1% of Middlesex Water's common stock. The Schedule 13G/A amendment lists sole voting power for 2,941,007 shares and sole dispositive power for 2,981,660 shares.

Does BlackRock control voting for Middlesex Water shares?

BlackRock reports sole voting power over 2,941,007 shares, indicating control of voting for that portion. The filing distinguishes voting power and dispositive power for clarity on authority over the shares.

Is the ownership reported as held on behalf of another fund?

Yes. The filing identifies iShares Core S&P Small-Cap ETF as a person whose interest exceeds five percent of the outstanding common stock. The report notes ownership on behalf of other accounts and funds.

Who signed the Schedule 13G/A amendment for BlackRock?

The Schedule 13G/A amendment is signed by Spencer Fleming, Managing Director, with signature date 04/24/2026. The filing includes Exhibit 24 (Power of Attorney) and Exhibit 99 per Item 7.