Nstar Electric Co SEC filings NSARO
Nstar Electric Co has 405 filings in SEC EDGAR's recent list, going back to Jan 27, 1994. Its latest annual report, Form 10-K, was filed on Feb 17, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 3, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Nov 4, 2026 (results of operations, regulation fd disclosure). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 4, 2026 | Nov 4, 2026 |
| 10-Q | Quarterly report | Aug 3, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 30, 2026 | Jul 30, 2026 |
| 8-K |
Current report
New debt
|
May 13, 2026 | May 13, 2026 |
| 424B5 | Prospectus supplement | May 12, 2026 | — |
| FWP | Free writing prospectus | May 11, 2026 | — |
| FWP | Free writing prospectus | May 11, 2026 | — |
| 424B3 | Prospectus | May 11, 2026 | — |
| 10-Q | Quarterly report | May 7, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations, Shareholder vote results, Regulation FD disclosure
|
May 6, 2026 | May 6, 2026 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Mar 31, 2026 | Mar 19, 2026 |
| POSASR | Filing | Feb 20, 2026 | — |
| 10-K | Annual report | Feb 17, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 12, 2026 | Feb 12, 2026 |
| 8-K | Current report | Jan 30, 2026 | Jan 27, 2026 |
| 10-Q | Quarterly report | Nov 6, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 4, 2025 | Nov 4, 2025 |
| 8-K |
Current report
New debt
|
Oct 17, 2025 | Oct 17, 2025 |
| 424B5 | Prospectus supplement | Oct 16, 2025 | — |
| FWP | Free writing prospectus | Oct 15, 2025 | — |
| 424B3 | Prospectus | Oct 15, 2025 | — |
| 10-Q | Quarterly report | Aug 4, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 31, 2025 | Jul 31, 2025 |
| 10-Q | Quarterly report | May 5, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations, Bylaw or fiscal year change, Shareholder vote results, Regulation FD disclosure
|
May 1, 2025 | May 1, 2025 |
| S-3ASR | Automatic shelf registration | Apr 3, 2025 | — |
| 8-K |
Current report
New debt
|
Feb 26, 2025 | Feb 26, 2025 |
| 424B5 | Prospectus supplement | Feb 25, 2025 | — |
| FWP | Free writing prospectus | Feb 24, 2025 | — |
| FWP | Free writing prospectus | Feb 24, 2025 | — |
| 424B3 | Prospectus | Feb 24, 2025 | — |
| 10-K | Annual report | Feb 14, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 11, 2025 | Feb 11, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 8, 2024 | Nov 8, 2024 |
| 10-Q | Quarterly report | Nov 6, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 4, 2024 | Nov 4, 2024 |
| 10-Q | Quarterly report | Aug 2, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 31, 2024 | Jul 31, 2024 |
| 8-K |
Current report
New debt
|
May 22, 2024 | May 22, 2024 |
| 424B5 | Prospectus supplement | May 21, 2024 | — |
| FWP | Free writing prospectus | May 20, 2024 | — |
| 424B3 | Prospectus | May 20, 2024 | — |
| 10-Q | Quarterly report | May 3, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations, Shareholder vote results, Regulation FD disclosure, Other events
|
May 1, 2024 | May 1, 2024 |
| 10-K | Annual report | Feb 14, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 14, 2024 | Feb 13, 2024 |
| 10-Q | Quarterly report | Nov 7, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 6, 2023 | Nov 6, 2023 |
| 15-12G | Deregistration | Sep 28, 2023 | — |
| 8-K |
Current report
New debt
|
Sep 25, 2023 | Sep 25, 2023 |
| 424B5 | Prospectus supplement | Sep 19, 2023 | — |
| FWP | Free writing prospectus | Sep 18, 2023 | — |
| 424B3 | Prospectus | Sep 18, 2023 | — |
| 10-Q | Quarterly report | Aug 4, 2023 | Jun 30, 2023 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 31, 2023 | Jul 31, 2023 |
| 10-Q | Quarterly report | May 5, 2023 | Mar 31, 2023 |
| 8-K |
Current report
Results of operations, Officer or director change, Shareholder vote results, Regulation FD disclosure
|
May 3, 2023 | May 3, 2023 |
| ARS | Annual report to shareholders | Mar 24, 2023 | Dec 31, 2022 |
| 10-K | Annual report | Feb 15, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 13, 2023 | Feb 13, 2023 |
| 10-Q | Quarterly report | Nov 4, 2022 | Sep 30, 2022 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 2, 2022 | Nov 2, 2022 |
| 8-K |
Current report
New debt
|
Sep 15, 2022 | Sep 15, 2022 |
| 424B5 | Prospectus supplement | Sep 13, 2022 | — |
| FWP | Free writing prospectus | Sep 12, 2022 | — |
| 424B3 | Prospectus | Sep 12, 2022 | — |
| 10-Q | Quarterly report | Aug 4, 2022 | Jun 30, 2022 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 28, 2022 | Jul 28, 2022 |
| 8-K |
Current report
New debt
|
May 17, 2022 | May 17, 2022 |
| 424B5 | Prospectus supplement | May 16, 2022 | — |
| FWP | Free writing prospectus | May 12, 2022 | — |
| 424B3 | Prospectus | May 12, 2022 | — |
| 10-Q | Quarterly report | May 6, 2022 | Mar 31, 2022 |
| 8-K |
Current report
Results of operations, Officer or director change, Shareholder vote results, Regulation FD disclosure
|
May 4, 2022 | May 4, 2022 |
| S-3ASR | Automatic shelf registration | Apr 13, 2022 | — |
| 10-K | Annual report | Feb 17, 2022 | Dec 31, 2021 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 16, 2022 | Feb 16, 2022 |
| 10-Q | Quarterly report | Nov 5, 2021 | Sep 30, 2021 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 2, 2021 | Nov 2, 2021 |
| 8-K |
Current report
New debt
|
Aug 23, 2021 | Aug 23, 2021 |
| 424B5 | Prospectus supplement | Aug 11, 2021 | — |
| FWP | Free writing prospectus | Aug 10, 2021 | — |
| 424B3 | Prospectus | Aug 10, 2021 | — |
| 10-Q | Quarterly report | Aug 6, 2021 | Jun 30, 2021 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 29, 2021 | Jul 29, 2021 |
| 8-K |
Current report
New debt
|
Jun 2, 2021 | May 27, 2021 |
| 424B5 | Prospectus supplement | May 25, 2021 | — |
| FWP | Free writing prospectus | May 24, 2021 | — |
| 424B3 | Prospectus | May 24, 2021 | — |
| 10-Q | Quarterly report | May 10, 2021 | Mar 31, 2021 |
| 8-K |
Current report
Results of operations, Officer or director change, Shareholder vote results, Regulation FD disclosure
|
May 10, 2021 | May 5, 2021 |
| 10-K | Annual report | Feb 17, 2021 | Dec 31, 2020 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 16, 2021 | Feb 16, 2021 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 9, 2020 | Nov 9, 2020 |
| 10-Q | Quarterly report | Nov 6, 2020 | Sep 30, 2020 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 3, 2020 | Nov 3, 2020 |
| 10-Q | Quarterly report | Aug 7, 2020 | Jun 30, 2020 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 30, 2020 | Jul 30, 2020 |
| 10-Q | Quarterly report | May 8, 2020 | Mar 31, 2020 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 6, 2020 | May 6, 2020 |
| 8-K |
Current report
New debt
|
Mar 26, 2020 | Mar 26, 2020 |
| 424B5 | Prospectus supplement | Mar 24, 2020 | — |
| FWP | Free writing prospectus | Mar 23, 2020 | — |
| 424B3 | Prospectus | Mar 23, 2020 | — |
| 8-K |
Current report
Other events
|
Mar 23, 2020 | Mar 23, 2020 |
| 10-K | Annual report | Feb 27, 2020 | Dec 31, 2019 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 19, 2020 | Feb 19, 2020 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 8, 2019 | Nov 8, 2019 |
| 10-Q | Quarterly report | Nov 7, 2019 | Sep 30, 2019 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 5, 2019 | Nov 5, 2019 |
| 10-Q | Quarterly report | Aug 6, 2019 | Jun 30, 2019 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 31, 2019 | Jul 31, 2019 |
| 8-K |
Current report
New debt
|
May 23, 2019 | May 17, 2019 |
| 424B5 | Prospectus supplement | May 15, 2019 | — |
| FWP | Free writing prospectus | May 14, 2019 | — |
| 424B3 | Prospectus | May 14, 2019 | — |
| 10-Q | Quarterly report | May 7, 2019 | Mar 31, 2019 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 1, 2019 | May 1, 2019 |
| S-3ASR | Automatic shelf registration | Apr 30, 2019 | — |
| 10-K | Annual report | Feb 26, 2019 | Dec 31, 2018 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 20, 2019 | Feb 20, 2019 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 9, 2018 | Nov 9, 2018 |
| 10-Q | Quarterly report | Nov 6, 2018 | Sep 30, 2018 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 1, 2018 | Nov 1, 2018 |
| 10-Q | Quarterly report | Aug 3, 2018 | Jun 30, 2018 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 31, 2018 | Jul 31, 2018 |
| 10-Q | Quarterly report | May 3, 2018 | Mar 31, 2018 |
| 8-K |
Current report
Results of operations, Other events
|
May 2, 2018 | May 1, 2018 |
| 10-K | Annual report | Feb 26, 2018 | Dec 31, 2017 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 22, 2018 | Feb 22, 2018 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 3, 2017 | Nov 3, 2017 |
| 10-Q | Quarterly report | Nov 3, 2017 | Sep 30, 2017 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 1, 2017 | Nov 1, 2017 |
| 8-K/A |
Amended current report
New debt
|
Oct 18, 2017 | Oct 5, 2017 |
| 8-K |
Current report
New debt
|
Oct 12, 2017 | Oct 5, 2017 |
| 424B5 | Prospectus supplement | Oct 3, 2017 | — |
| FWP | Free writing prospectus | Oct 2, 2017 | — |
| 424B3 | Prospectus | Oct 2, 2017 | — |
| 10-Q | Quarterly report | Aug 4, 2017 | Jun 30, 2017 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 27, 2017 | Jul 27, 2017 |
| 8-K |
Current report
New debt
|
May 18, 2017 | May 15, 2017 |
| 424B5 | Prospectus supplement | May 11, 2017 | — |
| FWP | Free writing prospectus | May 10, 2017 | — |
| 424B3 | Prospectus | May 10, 2017 | — |
| 10-Q | Quarterly report | May 5, 2017 | Mar 31, 2017 |
| 8-K |
Current report
Results of operations
|
May 3, 2017 | May 3, 2017 |
| 10-K | Annual report | Feb 23, 2017 | Dec 31, 2016 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 21, 2017 | Feb 21, 2017 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 4, 2016 | Nov 4, 2016 |
| 10-Q | Quarterly report | Nov 4, 2016 | Sep 30, 2016 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 1, 2016 | Nov 1, 2016 |
| 10-Q | Quarterly report | Aug 5, 2016 | Jun 30, 2016 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 28, 2016 | Jul 28, 2016 |
| 8-K |
Current report
Officer or director change
|
Jul 18, 2016 | Jul 12, 2016 |
| 8-K |
Current report
New debt
|
May 31, 2016 | May 26, 2016 |
| 424B5 | Prospectus supplement | May 24, 2016 | — |
| FWP | Free writing prospectus | May 23, 2016 | — |
| 424B3 | Prospectus | May 23, 2016 | — |
| 10-Q | Quarterly report | May 6, 2016 | Mar 31, 2016 |
| 8-K |
Current report
Officer or director change, Shareholder vote results, Other events
|
May 5, 2016 | May 4, 2016 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
May 4, 2016 | May 4, 2016 |
| S-3ASR | Automatic shelf registration | May 2, 2016 | — |
| 10-K | Annual report | Feb 26, 2016 | Dec 31, 2015 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 4, 2016 | Feb 4, 2016 |
| 8-K |
Current report
New debt
|
Nov 20, 2015 | Nov 18, 2015 |
| 424B5 | Prospectus supplement | Nov 16, 2015 | — |
| FWP | Free writing prospectus | Nov 13, 2015 | — |
| 424B3 | Prospectus | Nov 13, 2015 | — |
| 10-Q | Quarterly report | Nov 6, 2015 | Sep 30, 2015 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Nov 2, 2015 | Nov 2, 2015 |
| 8-K |
Current report
Material agreement, New debt
|
Oct 30, 2015 | Oct 26, 2015 |
| 10-Q | Quarterly report | Aug 5, 2015 | Jun 30, 2015 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Jul 30, 2015 | Jul 30, 2015 |
| 424B3 | Prospectus | May 13, 2015 | — |
| 10-Q | Quarterly report | May 6, 2015 | Mar 31, 2015 |
| 8-K |
Current report
Results of operations
|
Apr 29, 2015 | Apr 29, 2015 |
| ARS | Annual report to shareholders | Mar 16, 2015 | Dec 31, 2014 |
| 10-K | Annual report | Feb 25, 2015 | Dec 31, 2014 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 11, 2015 | Feb 11, 2015 |
| 10-Q | Quarterly report | Nov 7, 2014 | Sep 30, 2014 |
| 8-K |
Current report
Results of operations
|
Nov 7, 2014 | Nov 6, 2014 |
| 8-K |
Current report
Bylaw or fiscal year change
|
Oct 2, 2014 | Sep 29, 2014 |
| 10-Q | Quarterly report | Aug 1, 2014 | Jun 30, 2014 |
| 8-K |
Current report
Results of operations
|
Jul 31, 2014 | Jul 31, 2014 |
| 8-K |
Current report
Other events
|
Jun 25, 2014 | Jun 19, 2014 |
| UPLOAD | Letter from the SEC | Jun 9, 2014 | — |
| UPLOAD | Letter from the SEC | May 13, 2014 | — |
| 10-Q | Quarterly report | May 2, 2014 | Mar 31, 2014 |
| 8-K |
Current report
Results of operations
|
May 1, 2014 | May 1, 2014 |
| ARS | Annual report to shareholders | Mar 24, 2014 | Dec 31, 2013 |
| 8-K |
Current report
New debt
|
Mar 13, 2014 | Mar 7, 2014 |
| 424B5 | Prospectus supplement | Mar 5, 2014 | — |
| FWP | Free writing prospectus | Mar 4, 2014 | — |
| 424B3 | Prospectus | Mar 4, 2014 | — |
| 10-K | Annual report | Feb 25, 2014 | Dec 31, 2013 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure
|
Feb 6, 2014 | Feb 6, 2014 |
| 10-Q | Quarterly report | Nov 4, 2013 | Sep 30, 2013 |
| 8-K |
Current report
Results of operations
|
Oct 31, 2013 | Oct 31, 2013 |
| 8-K |
Current report
Material agreement, Agreement ended, New debt
|
Sep 12, 2013 | Sep 6, 2013 |
| 10-Q | Quarterly report | Aug 2, 2013 | Jun 30, 2013 |
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
- Electric Services (SIC 4911)
- Listed as
- NSARO (OTC), NSARP (OTC)
- Fiscal year ends
- December 31
- Incorporated in
- MA
- Headquarters
- Boston, MA
- SEC CIK
- 13372
- Former names
- BOSTON EDISON CO (until Jan 5, 2007)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.