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 |
|---|---|---|---|
| 10-Q | Quarterly report | Oct 29, 2026 | Sep 30, 2026 |
| 8-K |
Current report
Results of operations
|
Oct 29, 2026 | Oct 29, 2026 |
| 4 | Insider transaction | Aug 12, 2026 | Aug 11, 2026 |
| 4 | Insider transaction | Aug 7, 2026 | Aug 7, 2026 |
| 10-Q | Quarterly report | Jul 30, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Jul 30, 2026 | Jul 30, 2026 |
| 8-K |
Current report
Shareholder vote results
|
May 20, 2026 | May 19, 2026 |
| 10-Q | Quarterly report | Apr 30, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
Apr 30, 2026 | Apr 30, 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 |
| ARS | Annual report to shareholders | Apr 6, 2026 | Dec 31, 2025 |
| DEFA14A | Additional proxy material | Apr 6, 2026 | — |
| DEF 14A | Proxy statement | Apr 6, 2026 | May 19, 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 | — |
| 8-K |
Current report
Officer or director change
|
Mar 26, 2026 | Mar 26, 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 |
| 8-K |
Current report
Material agreement
|
Feb 24, 2026 | Feb 20, 2026 |
| 424B5 | Prospectus supplement | Feb 20, 2026 | — |
| 10-K | Annual report | Feb 19, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Feb 19, 2026 | Feb 19, 2026 |
| 3 | Initial insider ownership | Jan 2, 2026 | Jan 1, 2026 |
| 8-K |
Current report
Officer or director change
|
Dec 22, 2025 | Dec 22, 2025 |
| 4 | Insider transaction | Nov 18, 2025 | Nov 18, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 14, 2025 | — |
| 10-Q | Quarterly report | Oct 31, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Oct 31, 2025 | Oct 31, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 14, 2025 | — |
| 10-Q | Quarterly report | Jul 31, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Jul 31, 2025 | Jul 31, 2025 |
| 424B5 | Prospectus supplement | Jul 29, 2025 | — |
| 4 | Insider transaction | May 29, 2025 | May 28, 2025 |
| 8-K |
Current report
Shareholder vote results
|
May 22, 2025 | May 22, 2025 |
| 8-K |
Current report
Material agreement, Other events
|
May 12, 2025 | May 12, 2025 |
| 424B5 | Prospectus supplement | May 12, 2025 | — |
| S-3ASR | Automatic shelf registration | May 12, 2025 | — |
| 10-Q | Quarterly report | May 1, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 1, 2025 | May 1, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Apr 17, 2025 | — |
| ARS | Annual report to shareholders | Apr 10, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Apr 10, 2025 | — |
| DEF 14A | Proxy statement | Apr 10, 2025 | May 20, 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 |
| 10-K/A | Amended annual report | Mar 11, 2025 | Dec 31, 2024 |
| 4 | Insider transaction | Mar 11, 2025 | Mar 11, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 5, 2025 |
| 8-K |
Current report
Auditor change
|
Mar 4, 2025 | Feb 28, 2025 |
| 4 | Insider transaction | Mar 3, 2025 | Mar 1, 2025 |
| 10-K | Annual report | Feb 28, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Feb 28, 2025 | Feb 28, 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 |
| 8-K |
Current report
Officer or director change
|
Nov 26, 2024 | Nov 26, 2024 |
| SC 13G | Ownership over 5% (passive) | Nov 14, 2024 | — |
| 4 | Insider transaction | Nov 8, 2024 | Nov 8, 2024 |
| 8-K |
Current report
Officer or director change
|
Nov 5, 2024 | Nov 5, 2024 |
| 10-Q | Quarterly report | Oct 31, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations
|
Oct 31, 2024 | Oct 31, 2024 |
| SC 13G | Ownership over 5% (passive) | Oct 25, 2024 | — |
| 8-K |
Current report
Other events
|
Oct 24, 2024 | Oct 24, 2024 |
| 8-K |
Current report
Officer or director change
|
Oct 9, 2024 | Oct 9, 2024 |
| 8-K |
Current report
Other events
|
Aug 30, 2024 | Aug 30, 2024 |
| 4 | Insider transaction | Aug 27, 2024 | Aug 27, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Aug 2, 2024 | — |
| 10-Q | Quarterly report | Jul 31, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Jul 31, 2024 | Jul 31, 2024 |
| 8-K |
Current report
Other events
|
Jul 24, 2024 | Jul 24, 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 |
| 8-K |
Current report
Officer or director change
|
Jun 10, 2024 | Jun 10, 2024 |
| 4 | Insider transaction | May 23, 2024 | May 22, 2024 |
| 8-K |
Current report
Shareholder vote results, Other events
|
May 22, 2024 | May 22, 2024 |
| 10-Q | Quarterly report | May 8, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 8, 2024 | May 8, 2024 |
| 8-K |
Current report
Other events
|
Apr 25, 2024 | Apr 25, 2024 |
| DEF 14A | Proxy statement | Apr 11, 2024 | May 21, 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 |
| NT 10-K | Filing | Mar 1, 2024 | Dec 31, 2023 |
| 10-K | Annual report | Mar 1, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations
|
Feb 29, 2024 | Feb 29, 2024 |
| 8-K |
Current report
Other events
|
Feb 16, 2024 | Feb 16, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 13, 2024 | — |
| 8-K |
Current report
Other events
|
Jan 29, 2024 | Jan 29, 2024 |
| 8-K |
Current report
Officer or director change
|
Jan 23, 2024 | Jan 23, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 22, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Jan 19, 2024 | — |
| 8-K |
Current report
Other events
|
Jan 17, 2024 | Jan 17, 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 |
| 10-Q | Quarterly report | Nov 9, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 9, 2023 | Nov 9, 2023 |
| 10-Q/A | Amended quarterly report | Nov 8, 2023 | Jun 30, 2023 |
| 10-Q/A | Amended quarterly report | Nov 8, 2023 | Mar 31, 2023 |
| 10-K/A | Amended annual report | Nov 8, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Other events
|
Nov 2, 2023 | Nov 2, 2023 |
| 8-K |
Current report
Other events
|
Oct 20, 2023 | Oct 20, 2023 |
| 8-K |
Current report
Material agreement
|
Sep 1, 2023 | Sep 1, 2023 |
| 10-Q | Quarterly report | Jul 28, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations
|
Jul 28, 2023 | Jul 28, 2023 |
| 424B5 | Prospectus supplement | Jul 25, 2023 | — |
| 8-K |
Current report
Other events
|
Jul 20, 2023 | Jul 20, 2023 |
| 4 | Insider transaction | Jun 15, 2023 | Jun 13, 2023 |
| 4 | Insider transaction | Jun 5, 2023 | Jun 1, 2023 |
| 8-K |
Current report
Shareholder vote results, Other events
|
May 24, 2023 | May 24, 2023 |
| 8-K |
Current report
Officer or director change
|
May 16, 2023 | May 16, 2023 |
| 8-K |
Current report
Other events
|
May 15, 2023 | May 15, 2023 |
| 10-Q | Quarterly report | May 1, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Results of operations
|
May 1, 2023 | May 1, 2023 |
| 8-K |
Current report
Other events
|
Apr 28, 2023 | Apr 28, 2023 |
| DEF 14A | Proxy statement | Apr 10, 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 |
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
Other Water Supply companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.