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 |
|---|---|---|---|
| 424B5 | Prospectus supplement | Feb 20, 2026 | — |
| 424B5 | Prospectus supplement | Jul 29, 2025 | — |
| 424B5 | Prospectus supplement | May 12, 2025 | — |
| S-3ASR | Automatic shelf registration | May 12, 2025 | — |
| 424B5 | Prospectus supplement | Jul 25, 2023 | — |
| 424B5 | Prospectus supplement | Aug 3, 2022 | — |
| S-3ASR | Automatic shelf registration | Aug 3, 2022 | — |
| 424B5 | Prospectus supplement | Nov 20, 2019 | — |
| 424B5 | Prospectus supplement | Nov 19, 2019 | — |
| 424B3 | Prospectus | Oct 11, 2019 | — |
| 424B5 | Prospectus supplement | Sep 6, 2019 | — |
| S-3ASR | Automatic shelf registration | Sep 6, 2019 | — |
| 424B3 | Prospectus | Dec 13, 2018 | — |
| S-3/A | Filing | Jul 31, 2015 | — |
| S-3 | Shelf registration | Jul 16, 2015 | — |
| 424B3 | Prospectus | Jun 6, 2013 | — |
| 424B2 | Prospectus | Jun 9, 2010 | — |
| 424B5 | Prospectus supplement | Jun 2, 2010 | — |
| S-3/A | S-3/a amendment no. 1 | May 13, 2010 | — |
| S-3 | Shelf registration | Apr 30, 2010 | — |
| FWP | Free writing prospectus | Aug 28, 2009 | — |
| 424B3 | Prospectus | Aug 28, 2009 | — |
| S-3/A | Form s-3/a | Aug 19, 2009 | — |
| 424B3 | Prospectus | Aug 11, 2009 | — |
| S-3 | Shelf registration | Jul 23, 2009 | — |
| S-3 | Shelf registration | Mar 13, 2009 | — |
| S-8 | Employee stock plan registration | Dec 18, 2008 | — |
Showing 27 filings. 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.