Middlesex Water Company
US ˙ NasdaqGS ˙ US5966801087

SecurityMSEX / Middlesex Water Company
InstitutionClean Yield Group
Latest Disclosed Ownership4,350 shares
Latest Disclosed Value $ 226,418
Clean Yield Group reports 3.87% decrease in ownership of MSEX / Middlesex Water Company

On April 14, 2026 - Clean Yield Group filed a 13F-HR form disclosing ownership of 4,350 shares of Middlesex Water Company (US:MSEX) valued at $226,418 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 4,525 shares of Middlesex Water Company. This represents a change in shares of -3.87% during the quarter. The current value of the position is $225,896 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-04-14 2026-03-31 13F MIDDLESEX WTR CO COM Stock 596680108 4,350 -175 -3.87 226 -0.88 0.0637
2026-01-26 2025-12-31 13F MIDDLESEX WTR CO COM Stock 596680108 4,525 0 0.00 228 -6.56 0.0633
2025-10-23 2025-09-30 13F MIDDLESEX WTR CO COM Stock 596680108 4,525 0 0.00 245 -0.41 0.0692
2025-07-17 2025-06-30 13F MIDDLESEX WTR CO COM Stock 596680108 4,525 0 0.00 245 -15.52 0.0733
2025-04-14 2025-03-31 13F MIDDLESEX WTR CO COM Stock 596680108 4,525 -2,400 -34.66 290 -20.33 0.0945
2025-01-13 2024-12-31 13F MIDDLESEX WTR CO COM Stock 596680108 6,925 0 0.00 364 -19.29 0.1159
2024-10-07 2024-09-30 13F MIDDLESEX WTR CO COM Stock 596680108 6,925 0 0.00 452 24.93 0.1431
2024-07-10 2024-06-30 13F MIDDLESEX WTR CO COM Stock 596680108 6,925 -150 -2.12 362 -2.70 0.1352
2024-05-29 2024-03-31 13F MIDDLESEX WTR CO COM Stock 596680108 7,075 -150 -2.08 371 -21.73 0.1445
2024-01-24 2023-12-31 13F MIDDLESEX WTR CO COM Stock 596680108 7,225 -560 -7.19 474 -9.54 0.1997
2023-10-12 2023-09-30 13F MIDDLESEX WTR CO COM Stock 596680108 7,785 -275 -3.41 524 -19.38 0.2324
2023-07-26 2023-06-30 13F MIDDLESEX WTR CO COM Stock 596680108 8,060 -101 -1.24 650 2.04 0.2678
2023-04-26 2023-03-31 13F MIDDLESEX WTR CO COM Stock 596680108 8,161 -248 -2.95 638 -3.63 0.2716
2023-01-31 2022-12-31 13F MIDDLESEX WTR CO COM Stock 596680108 8,409 -491 -5.52 662 -3.78 0.2841
2022-10-31 2022-09-30 13F MIDDLESEX WTR CO COM Stock 596680108 8,900 -850 -8.72 687 -19.65 0.3188
2022-07-18 2022-06-30 13F MIDDLESEX WTR CO COM Stock 596680108 9,750 0 0.00 855 -16.59 0.3534
2022-04-25 2022-03-31 13F MIDDLESEX WTR CO COM Stock 596680108 9,750 -300 -2.99 1,025 -15.22 0.3620
2022-01-24 2021-12-31 13F MIDDLESEX WTR CO COM Stock 596680108 10,050 0 0.00 1,209 17.04 0.3864
2021-10-27 2021-09-30 13F MIDDLESEX WTR CO COM Stock 596680108 10,050 170 1.72 1,033 27.85 0.3388
2021-07-26 2021-06-30 13F MIDDLESEX WTR CO COM Stock 596680108 9,880 -500 -4.82 808 -1.46 0.2746
2021-04-26 2021-03-31 13F MIDDLESEX WTR CO COM Stock 596680108 10,380 -300 -2.81 820 5.94 0.3085
2021-01-26 2020-12-31 13F MIDDLESEX WTR CO COM Stock 596680108 10,680 -350 -3.17 774 12.83 0.2782
2020-10-16 2020-09-30 13F MIDDLESEX WTR CO COM Stock 596680108 11,030 -100 -0.90 686 -8.29 0.2782
2020-07-22 2020-06-30 13F MIDDLESEX WATER CO COM Stock 596680108 11,130 -2,250 -16.82 748 -6.97 0.3232
2020-04-20 2020-03-31 13F MIDDLESEX WATER CO COM Stock 596680108 13,380 0 0.00 804 -5.52 0.3819
2020-01-17 2019-12-31 13F MIDDLESEX WATER CO COM Stock 596680108 13,380 0 0.00 851 -2.07 0.2667
2019-10-23 2019-09-30 13F MIDDLESEX WATER CO COM Stock 596680108 13,380 0 0.00 869 9.58 0.2866
2019-07-22 2019-06-30 13F MIDDLESEX WATER CO COM Stock 596680108 13,380 -1,005 -6.99 793 -1.49 0.2866
2019-04-24 2019-03-31 13F MIDDLESEX WATER CO COM Stock 596680108 14,385 -337 -2.29 805 2.55 0.3259
2019-01-23 2018-12-31 13F MIDDLESEX WATER CO COM Stock 596680108 14,722 0 0.00 785 10.10 0.3417
2018-10-22 2018-09-30 13F MIDDLESEX WATER CO COM Stock 596680108 14,722 -987 -6.28 713 7.70 0.2838
2018-07-24 2018-06-30 13F MIDDLESEX WATER CO COM Stock 596680108 15,709 -1 -0.01 662 14.73 0.2742
2018-04-23 2018-03-31 13F MIDDLESEX WATER CO COM Stock 596680108 15,710 -5,337 -25.36 577 -31.31 0.2437
2018-01-16 2017-12-31 13F MIDDLESEX WATER CO COM Stock 596680108 21,047 0 0.00 840 1.57 0.3325
2017-10-11 2017-09-30 13F MIDDLESEX WATER CO COM Stock 596680108 21,047 -1,575 -6.96 827 -3.84 0.3373
2017-07-17 2017-06-30 13F MIDDLESEX WATER CO COM Stock 596680108 22,622 -1,405 -5.85 860 -3.15 0.3598
2017-05-03 2017-03-31 13F MIDDLESEX WATER CO COM Stock 596680108 24,027 -3,850 -13.81 888 -25.81 0.3741
2017-01-24 2016-12-31 13F MIDDLESEX WATER CO COM Stock 596680108 27,877 -3,395 -10.86 1,197 8.62 0.5399
2016-10-28 2016-09-30 13F MIDDLESEX WATER CO COM Stock 596680108 31,272 -2,660 -7.84 1,102 -25.14 0.4790
2016-07-27 2016-06-30 13F MIDDLESEX WATER CO COM Stock 596680108 33,932 -18,427 -35.19 1,472 -18.40 0.6319
2016-04-15 2016-03-31 13F MIDDLESEX WATER CO COM Stock 596680108 52,359 -105 -0.20 1,804 29.13 0.8020
2016-01-27 2015-12-31 13F MIDDLESEX WATER CO COM Stock 596680108 52,464 10,500 25.02 1,397 27.93 0.6893
2015-10-29 2015-09-30 13F MIDDLESEX WATER CO COM Stock 596680108 41,964 41,964 1,092 0.5150
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.