Middlesex Water Co
MSEX- Exchange
- Nasdaq
- Industry
- Water Supply
- SEC CIK
- 0000066004
In the last 90 days, Middlesex Water Co insiders filed 0 open-market purchases and 1 sale; 227 institutions reported holding it in 13F filings for Q2 2026, worth $881.5M in total; no superinvestor holds it.
Other share classesMSEXP
Holders of 5% or more of MSEX
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Middlesex Water Co, largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| BlackRock, Inc. | 13G/A | 16.10%2.98M shares | −1.90 ppfrom 18.00% | Feb 5, 20253 filings | Apr 24, 2026 | SEC |
| T. Rowe Price Investment Management, Inc. | 13G/A | 9.10%1.64M shares | – | Nov 14, 20251 filing | Nov 14, 2025 | SEC |
| Neuberger Berman Group LLC | 13G | 5.60%1.01M shares | New | Oct 14, 20251 filing | Oct 14, 2025 | SEC |
| Vanguard Capital Management LLC | 13G | 5.18%961.1K shares | New | Apr 30, 20261 filing | Apr 30, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
8 Schedule 13D and 13G filings on Middlesex Water Co, newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Apr 30, 202611:32 AM ET | Vanguard Capital Management LLC | 13G | 5.18%961.1K shares | New | Mar 31, 2026 | SEC |
| Apr 24, 20264:11 PM ET | BlackRock, Inc. | 13G/A | 16.10%2.98M shares | −1.90 ppfrom 18.00% | Mar 31, 2026 | SEC |
| Mar 27, 202610:53 AM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | –Below 5% | Mar 13, 2026 | SEC |
| Nov 14, 202512:18 PM ET | T. Rowe Price Investment Management, Inc. | 13G/A | 9.10%1.64M shares | – | Sep 30, 2025 | SEC |
| Oct 14, 20251:05 PM ET | Neuberger Berman Group LLCand 1 other | 13G | 5.60%1.01M shares | New | Sep 30, 2025 | SEC |
| Apr 17, 20259:35 AM ET | BlackRock, Inc. | 13G/A | 18.00%3.22M shares | −1.50 ppfrom 19.50% | Mar 31, 2025 | SEC |
| Feb 5, 20251:23 PM ET | BlackRock, Inc. | 13G/A | 19.50%3.48M shares | – | Dec 31, 2024 | SEC |
| Jan 31, 202510:34 AM ET | First Trust Portfolios LPand 2 others | 13G/A | 2.90%516.9K shares | –Below 5% | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Middlesex Water Co shares.
No Form 144 notices for Middlesex Water Co are on file.