National Grid PLC SEC filings NGG
National Grid PLC has 1,002 filings in SEC EDGAR's recent list, going back to Jan 6, 2003. Its latest annual report, Form 20-F, was filed on Jun 3, 2026 for the period ended Mar 31, 2026. The most recent current report (Form 6-K) was filed on Nov 5, 2026. The company's fiscal year ends on March 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 11-K | Employee savings plan report | Jun 16, 2026 | Dec 31, 2025 |
| CERT | Nyse certification | Jun 12, 2026 | — |
| 8-A12B | Filing | Jun 12, 2026 | — |
| 11-K | Employee savings plan report | Jun 13, 2025 | Dec 31, 2024 |
| 11-K/A | Filing | Jun 26, 2024 | Dec 31, 2023 |
| 11-K | Employee savings plan report | Jun 25, 2024 | Dec 31, 2023 |
| CERT | Nyse certification | Jan 17, 2024 | — |
| 8-A12B | Filing | Jan 17, 2024 | — |
| 15-12G | Deregistration | Jan 3, 2024 | — |
| 25 | Filing | Dec 21, 2023 | — |
| 11-K | Employee savings plan report | Jun 23, 2023 | Dec 31, 2022 |
| CERT | Nyse certification | Jun 15, 2023 | — |
| 8-A12B | Filing | Jun 15, 2023 | — |
| POSASR | Filing | Jun 5, 2023 | — |
| 11-K | Employee savings plan report | Jun 24, 2022 | Dec 31, 2021 |
| 11-K | Employee savings plan report | Jun 24, 2022 | Dec 31, 2021 |
| 11-K | Employee savings plan report | Jun 28, 2021 | Dec 31, 2020 |
| 11-K | Employee savings plan report | Jun 28, 2021 | Dec 31, 2020 |
| 11-K | Employee savings plan report | Jun 25, 2021 | Dec 31, 2020 |
| 11-K | Employee savings plan report | Jun 25, 2021 | Dec 31, 2020 |
| 11-K | Employee savings plan report | Jun 24, 2020 | Dec 31, 2019 |
| 11-K | Employee savings plan report | Jun 24, 2020 | Dec 31, 2019 |
| 11-K | Employee savings plan report | Jun 24, 2019 | Dec 31, 2018 |
| 11-K | Employee savings plan report | Jun 24, 2019 | Dec 31, 2018 |
| CT ORDER | Filing | Jul 16, 2018 | — |
| 11-K | Employee savings plan report | Jun 19, 2018 | Dec 31, 2017 |
| 11-K | Employee savings plan report | Jun 19, 2018 | Dec 31, 2017 |
| UPLOAD | Letter from the SEC | Oct 24, 2017 | — |
| CORRESP | Letter to the SEC | Oct 13, 2017 | — |
| CORRESP | Letter to the SEC | Sep 28, 2017 | — |
| UPLOAD | Letter from the SEC | Sep 15, 2017 | — |
| CORRESP | Letter to the SEC | Aug 30, 2017 | — |
| UPLOAD | Letter from the SEC | Aug 3, 2017 | — |
| CT ORDER | Filing | Jun 30, 2017 | — |
| 11-K | Employee savings plan report | Jun 29, 2017 | Dec 31, 2016 |
| 11-K | Employee savings plan report | Jun 29, 2017 | Dec 31, 2016 |
| UPLOAD | Letter from the SEC | Oct 18, 2016 | — |
| CORRESP | Letter to the SEC | Oct 17, 2016 | — |
| UPLOAD | Letter from the SEC | Sep 21, 2016 | — |
| 11-K | Employee savings plan report | Jun 28, 2016 | Dec 31, 2015 |
| 11-K | Employee savings plan report | Jun 28, 2016 | Dec 31, 2015 |
| UPLOAD | Letter from the SEC | Sep 16, 2015 | — |
| CORRESP | Letter to the SEC | Sep 14, 2015 | — |
| UPLOAD | Letter from the SEC | Aug 24, 2015 | — |
| 11-K | Employee savings plan report | Jun 29, 2015 | Dec 31, 2014 |
| 11-K | Employee savings plan report | Jun 29, 2015 | Dec 31, 2014 |
| 25-NSE | Delisting notice | Mar 25, 2015 | — |
| UPLOAD | Letter from the SEC | Oct 28, 2014 | — |
| CORRESP | Letter to the SEC | Oct 10, 2014 | — |
| UPLOAD | Letter from the SEC | Sep 17, 2014 | — |
| 11-K | Employee savings plan report | Jun 30, 2014 | Dec 31, 2013 |
| 11-K | Employee savings plan report | Jun 30, 2014 | Dec 31, 2013 |
| 11-K | Employee savings plan report | Jul 1, 2013 | Dec 31, 2012 |
| 11-K | Employee savings plan report | Jul 1, 2013 | Dec 31, 2012 |
| UPLOAD | Letter from the SEC | Nov 1, 2012 | — |
| CORRESP | Letter to the SEC | Oct 24, 2012 | — |
| UPLOAD | Letter from the SEC | Sep 27, 2012 | — |
| 11-K | Employee savings plan report | Jun 27, 2012 | Dec 31, 2011 |
| 11-K | Employee savings plan report | Jun 27, 2012 | Dec 31, 2011 |
| 11-K | Employee savings plan report | Jun 29, 2011 | Dec 31, 2010 |
| 11-K | Employee savings plan report | Jun 29, 2011 | Dec 31, 2010 |
| UPLOAD | Letter from the SEC | Oct 20, 2010 | — |
| CORRESP | Letter to the SEC | Oct 15, 2010 | — |
| UPLOAD | Letter from the SEC | Oct 8, 2010 | — |
| CORRESP | Letter to the SEC | Oct 1, 2010 | — |
| CORRESP | Letter to the SEC | Sep 9, 2010 | — |
| UPLOAD | Letter from the SEC | Sep 2, 2010 | — |
| 11-K | Employee savings plan report | Jun 29, 2010 | Dec 31, 2009 |
| 11-K | Employee savings plan report | Jun 29, 2010 | Dec 31, 2009 |
| 11-K | Employee savings plan report | Jun 29, 2009 | Dec 31, 2008 |
| 11-K | Employee savings plan report | Jun 29, 2009 | Dec 31, 2008 |
| 11-K | Employee savings plan report | Jun 30, 2008 | Dec 31, 2007 |
| 11-K | Employee savings plan report | Jun 30, 2008 | Dec 31, 2007 |
| 11-K | Employee savings plan report | Jun 27, 2007 | Dec 31, 2006 |
| 11-K | Employee savings plan report | Jun 27, 2007 | Dec 31, 2006 |
| UPLOAD | Letter from the SEC | Feb 22, 2007 | — |
| CORRESP | Letter to the SEC | Feb 2, 2007 | — |
| UPLOAD | Letter from the SEC | Jan 9, 2007 | — |
| CORRESP | Letter to the SEC | Dec 8, 2006 | — |
| UPLOAD | Letter from the SEC | Oct 31, 2006 | — |
| UPLOAD | Letter from the SEC | Sep 22, 2006 | — |
| CERTNYS | Auto-generated paper document | Aug 1, 2006 | — |
| 8-A12B | Form 8-a | Jul 21, 2006 | — |
| 11-K | Employee savings plan report | Jun 29, 2006 | Dec 31, 2005 |
| 11-K | Employee savings plan report | Jun 29, 2006 | Dec 31, 2005 |
| 8-A12G | Form 8-a | Jun 29, 2006 | — |
| 35-CERT | Filing | Nov 29, 2005 | — |
| CORRESP | Letter to the SEC | Oct 21, 2005 | — |
| 35-CERT | Rule 24 certificate | Sep 30, 2005 | — |
| RW | Registration withdrawal request letter | Sep 21, 2005 | — |
| U5S/A | Filing | Sep 14, 2005 | Mar 31, 2005 |
| RW | Filing | Sep 6, 2005 | — |
| 35-CERT/A | Mar2005amd | Aug 9, 2005 | — |
| SC TO-I/A | Filing | Aug 8, 2005 | — |
| SE | Auto-generated paper document | Aug 1, 2005 | — |
| U5S | Filing | Jul 28, 2005 | Mar 31, 2005 |
| SC TO-I/A | Filing | Jul 28, 2005 | — |
| SC TO-I/A | Filing | Jul 26, 2005 | — |
| SC TO-I/A | Filing | Jul 22, 2005 | — |
| SE | Auto-generated paper document | Jun 30, 2005 | — |
| SE | Auto-generated paper document | Jun 30, 2005 | — |
| 11-K | Employee savings plan report | Jun 29, 2005 | Dec 31, 2004 |
| 11-K | Employee savings plan report | Jun 29, 2005 | Dec 31, 2004 |
| 35-CERT | P/e 3/31/05 | Jun 29, 2005 | — |
| SC TO-I/A | Filing | Jun 22, 2005 | — |
| SC TO-I/A | Filing | Jun 20, 2005 | — |
| SC TO-I | Filing | Jun 15, 2005 | — |
| NO ACT | Auto-generated paper document | Jun 6, 2005 | Jun 4, 2005 |
| SC TO-C | Filing | Jun 6, 2005 | — |
| U-1/A | Filing | Jun 1, 2005 | — |
| SC TO-C | Filing | May 5, 2005 | — |
| U-1/A | Filing | Apr 29, 2005 | — |
| SC TO-C | Filing | Apr 22, 2005 | — |
| SC TO-C | Filing | Mar 25, 2005 | — |
| U-1 | Filing | Mar 25, 2005 | — |
| U-12-IB | Nick winser | Feb 25, 2005 | — |
| U-1/A | Post-effective amendment no. 1 | Dec 17, 2004 | — |
| 35-CERT | Filing | Nov 24, 2004 | — |
| U-1/A | Amendment no. 2 to application on form u-1 | Sep 30, 2004 | — |
| U-1/A | Amendment no. 1 to appl. on form u-1 | Aug 30, 2004 | — |
| U5S | Filing | Jul 29, 2004 | Mar 31, 2004 |
| U-1 | Form u-1 | Jul 15, 2004 | — |
| 35-CERT | P/e 3/31/04 | Jun 29, 2004 | — |
| 35-CERT | P/e 3/31/04 | Jun 29, 2004 | — |
| 11-K | Employee savings plan report | Jun 28, 2004 | Dec 31, 2003 |
| 11-K | Employee savings plan report | Jun 28, 2004 | Dec 31, 2003 |
| U-57 | Notification of foreign utility company status | Apr 1, 2004 | — |
| U-12-IA | Filing | Mar 30, 2004 | — |
| SE | Auto-generated paper document | Nov 28, 2003 | — |
| SE | Auto-generated paper document | Nov 28, 2003 | — |
| 35-CERT | Filing | Nov 26, 2003 | — |
| 35-CERT | Filing | Nov 26, 2003 | — |
| U5S/A | Filing | Nov 10, 2003 | Mar 31, 2003 |
| 35-CERT/A | Amending 6/27/03 filing | Nov 10, 2003 | — |
| 35-CERT/A | Amending 6/27/03 filing | Nov 10, 2003 | — |
| SE | Auto-generated paper document | Aug 1, 2003 | — |
| SE | Auto-generated paper document | Jul 30, 2003 | — |
| U5S | Filing | Jul 29, 2003 | Mar 31, 2003 |
| 11-K | Employee savings plan report | Jul 2, 2003 | Dec 31, 2002 |
| 11-K | Employee savings plan report | Jul 2, 2003 | Dec 31, 2002 |
| 11-K | Employee savings plan report | Jun 30, 2003 | Dec 31, 2002 |
| 11-K | Employee savings plan report | Jun 30, 2003 | Dec 31, 2002 |
| SE | Auto-generated paper document | Jun 27, 2003 | — |
| 35-CERT | Filing | Jun 27, 2003 | — |
| 35-CERT | Filing | Jun 27, 2003 | — |
Showing 145 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
- Natural Gas Transmission (SIC 4922)
- Listed as
- NGG (NYSE), NGGTF (OTC), NEWEN (OTC), NMKBP (OTC), NMKCP (OTC), NMPWP (OTC)
- Fiscal year ends
- March 31
- Headquarters
- London, United Kingdom
- SEC filer status
- Large accelerated filer
- SEC CIK
- 1004315
- Former names
- NATIONAL GRID TRANSCO PLC (until Jul 28, 2005); NATIONAL GRID GROUP PLC (until Nov 1, 2002)
Other Natural Gas Transmission companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.