Middlesex Water Co SEC filings MSEX
Middlesex Water Co has 1,000 filings in SEC EDGAR's recent list, going back to Aug 11, 2008. Its latest annual report, Form ARS, was filed on Apr 6, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Oct 29, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Oct 29, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 4 | Insider transaction | Aug 12, 2026 | Aug 11, 2026 |
| 4 | Insider transaction | Aug 7, 2026 | Aug 7, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 30, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 24, 2026 | — |
| 3 | Initial insider ownership | Apr 8, 2026 | Mar 26, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 1, 2026 | Apr 1, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 27, 2026 | — |
| 4 | Insider transaction | Mar 16, 2026 | Jun 15, 2025 |
| 4 | Insider transaction | Mar 4, 2026 | Mar 4, 2026 |
| 4 | Insider transaction | Mar 3, 2026 | Mar 3, 2026 |
| 4 | Insider transaction | Mar 2, 2026 | Mar 1, 2026 |
| 4 | Insider transaction | Feb 27, 2026 | Feb 27, 2026 |
| 4 | Insider transaction | Feb 25, 2026 | Feb 25, 2026 |
| 3 | Initial insider ownership | Jan 2, 2026 | Jan 1, 2026 |
| 4 | Insider transaction | Nov 18, 2025 | Nov 18, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 14, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 14, 2025 | — |
| 4 | Insider transaction | May 29, 2025 | May 28, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 17, 2025 | — |
| 4 | Insider transaction | Apr 3, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 3, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 3, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 3, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 3, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 2, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 2, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Apr 1, 2025 | Apr 1, 2025 |
| 4 | Insider transaction | Mar 24, 2025 | Mar 21, 2025 |
| 144 | Notice of proposed sale | Mar 17, 2025 | — |
| 4/A | Filing | Mar 14, 2025 | Nov 23, 2021 |
| 4/A | Filing | Mar 14, 2025 | Apr 1, 2022 |
| 4/A | Filing | Mar 14, 2025 | Mar 31, 2023 |
| 4/A | Filing | Mar 14, 2025 | Apr 1, 2024 |
| 4/A | Filing | Mar 14, 2025 | Apr 1, 2021 |
| 3 | Initial insider ownership | Mar 13, 2025 | Dec 15, 2020 |
| 4 | Insider transaction | Mar 11, 2025 | Mar 11, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Mar 1, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 5, 2025 | — |
| 4 | Insider transaction | Feb 3, 2025 | Jan 31, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 31, 2025 | — |
| 4 | Insider transaction | Jan 3, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Dec 20, 2024 | Dec 19, 2024 |
| 3 | Initial insider ownership | Dec 19, 2024 | Dec 19, 2024 |
| SC 13G | Ownership over 5% (passive) | Nov 14, 2024 | — |
| 4 | Insider transaction | Nov 8, 2024 | Nov 8, 2024 |
| SC 13G | Ownership over 5% (passive) | Oct 25, 2024 | — |
| 4 | Insider transaction | Aug 27, 2024 | Aug 27, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Aug 2, 2024 | — |
| 4 | Insider transaction | Jun 26, 2024 | Jun 24, 2024 |
| 3 | Initial insider ownership | Jun 24, 2024 | Jun 24, 2024 |
| 4 | Insider transaction | Jun 21, 2024 | Jun 20, 2024 |
| 4 | Insider transaction | May 23, 2024 | May 22, 2024 |
| 4 | Insider transaction | Apr 3, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 3, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 3, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 3, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 3, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 3, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 3, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 3, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Apr 1, 2024 |
| 4 | Insider transaction | Apr 2, 2024 | Apr 1, 2024 |
| 4/A | Filing | Mar 11, 2024 | Mar 1, 2024 |
| 3/A | Filing | Mar 11, 2024 | Mar 1, 2024 |
| 4 | Insider transaction | Mar 8, 2024 | Mar 4, 2024 |
| 4 | Insider transaction | Mar 8, 2024 | Mar 6, 2024 |
| 3 | Initial insider ownership | Mar 8, 2024 | Mar 4, 2024 |
| 4/A | Filing | Mar 7, 2024 | Feb 29, 2024 |
| 4 | Insider transaction | Mar 6, 2024 | Feb 28, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 22, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 19, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Jan 12, 2024 | — |
| 144 | Notice of proposed sale | Dec 20, 2023 | — |
| 4 | Insider transaction | Dec 20, 2023 | Dec 20, 2023 |
| 4 | Insider transaction | Dec 13, 2023 | Dec 11, 2023 |
| 4 | Insider transaction | Jun 15, 2023 | Jun 13, 2023 |
| 4 | Insider transaction | Jun 5, 2023 | Jun 1, 2023 |
| 4 | Insider transaction | Apr 4, 2023 | Mar 31, 2023 |
| 4 | Insider transaction | Apr 4, 2023 | Mar 31, 2023 |
| 4 | Insider transaction | Apr 4, 2023 | Mar 31, 2023 |
| 4 | Insider transaction | Apr 4, 2023 | Mar 31, 2023 |
| 4 | Insider transaction | Apr 4, 2023 | Mar 31, 2023 |
| 4 | Insider transaction | Apr 4, 2023 | Mar 31, 2023 |
| 4 | Insider transaction | Apr 4, 2023 | Mar 31, 2023 |
| 4 | Insider transaction | Apr 4, 2023 | Mar 31, 2023 |
| 4/A | Filing | Apr 3, 2023 | Dec 1, 2022 |
| 4 | Insider transaction | Apr 3, 2023 | Mar 29, 2023 |
| 4 | Insider transaction | Apr 3, 2023 | Mar 29, 2023 |
| 4 | Insider transaction | Apr 3, 2023 | Mar 29, 2023 |
| 4 | Insider transaction | Apr 3, 2023 | Mar 29, 2023 |
| 4 | Insider transaction | Apr 3, 2023 | Mar 29, 2023 |
| 4 | Insider transaction | Apr 3, 2023 | Mar 29, 2023 |
| 4 | Insider transaction | Apr 3, 2023 | Mar 29, 2023 |
| 4 | Insider transaction | Apr 3, 2023 | Mar 29, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 26, 2023 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 20, 2023 | — |
| 4 | Insider transaction | Dec 2, 2022 | Dec 1, 2022 |
| 4/A | Filing | Nov 23, 2022 | Nov 23, 2022 |
| 4 | Insider transaction | Nov 22, 2022 | Nov 22, 2022 |
| 4 | Insider transaction | Jun 22, 2022 | Jun 21, 2022 |
| SC 13G | Ownership over 5% (passive) | May 10, 2022 | — |
| 4 | Insider transaction | Apr 6, 2022 | Apr 5, 2022 |
| 4 | Insider transaction | Apr 6, 2022 | Apr 5, 2022 |
| 4 | Insider transaction | Apr 6, 2022 | Apr 5, 2022 |
| 4 | Insider transaction | Apr 6, 2022 | Apr 5, 2022 |
| 4 | Insider transaction | Apr 6, 2022 | Apr 5, 2022 |
| 4 | Insider transaction | Apr 6, 2022 | Apr 5, 2022 |
| 4 | Insider transaction | Apr 6, 2022 | Apr 5, 2022 |
| 4 | Insider transaction | Apr 6, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Apr 5, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Apr 5, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Apr 5, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Apr 5, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Apr 5, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Apr 5, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Apr 5, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Apr 5, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Apr 5, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Apr 5, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Apr 5, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Apr 5, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Apr 5, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Apr 5, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Apr 5, 2022 | Apr 1, 2022 |
| 4 | Insider transaction | Mar 18, 2022 | Mar 18, 2022 |
| 4/A | Filing | Mar 16, 2022 | Nov 29, 2021 |
| 4 | Insider transaction | Mar 4, 2022 | Mar 4, 2022 |
| 4 | Insider transaction | Mar 4, 2022 | Mar 4, 2022 |
| 4 | Insider transaction | Mar 4, 2022 | Mar 3, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 10, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 27, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 25, 2022 | — |
| 4 | Insider transaction | Nov 29, 2021 | Nov 23, 2021 |
| 4 | Insider transaction | Nov 29, 2021 | Nov 23, 2021 |
| 4 | Insider transaction | Nov 29, 2021 | Nov 23, 2021 |
| 4 | Insider transaction | Nov 18, 2021 | Nov 16, 2021 |
| 4 | Insider transaction | Nov 3, 2021 | Nov 3, 2021 |
| 4 | Insider transaction | Sep 28, 2021 | Sep 27, 2021 |
| 4 | Insider transaction | Sep 3, 2021 | Sep 3, 2021 |
| 4 | Insider transaction | Aug 10, 2021 | Aug 10, 2021 |
| SC 13G/A | Amended ownership over 5% (passive) | Aug 9, 2021 | — |
| 4 | Insider transaction | Aug 9, 2021 | Aug 9, 2021 |
| 4 | Insider transaction | Aug 6, 2021 | Aug 6, 2021 |
| 4 | Insider transaction | Aug 6, 2021 | Aug 5, 2021 |
| 3 | Initial insider ownership | Jul 28, 2021 | Jul 15, 2021 |
| 4 | Insider transaction | Jun 17, 2021 | Jun 16, 2021 |
| 4 | Insider transaction | Jun 4, 2021 | Jun 4, 2021 |
| 4 | Insider transaction | Jun 3, 2021 | Jun 3, 2021 |
| 4 | Insider transaction | Jun 2, 2021 | Jun 1, 2021 |
| 4 | Insider transaction | May 18, 2021 | May 18, 2021 |
| 4 | Insider transaction | Apr 5, 2021 | Apr 1, 2021 |
| 4 | Insider transaction | Apr 5, 2021 | Apr 1, 2021 |
| 4 | Insider transaction | Apr 5, 2021 | Apr 1, 2021 |
| 4 | Insider transaction | Apr 5, 2021 | Apr 1, 2021 |
| 4 | Insider transaction | Apr 5, 2021 | Apr 1, 2021 |
| 4 | Insider transaction | Apr 5, 2021 | Apr 1, 2021 |
| 4 | Insider transaction | Apr 5, 2021 | Apr 1, 2021 |
| 4 | Insider transaction | Apr 1, 2021 | Apr 1, 2021 |
| 4 | Insider transaction | Apr 1, 2021 | Apr 1, 2021 |
| 4 | Insider transaction | Apr 1, 2021 | Apr 1, 2021 |
| 4 | Insider transaction | Apr 1, 2021 | Apr 1, 2021 |
| 4 | Insider transaction | Apr 1, 2021 | Apr 1, 2021 |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Water Supply (SIC 4941)
- Listed as
- MSEX (Nasdaq), MSEXP (OTC)
- Fiscal year ends
- December 31
- Incorporated in
- NJ
- Headquarters
- Iselin, NJ
- SEC filer status
- Large accelerated filer
- SEC CIK
- 66004
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.