SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F (Mark One) ¨ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR þ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended 31 March 2019 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ¨ SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of event r ...

National Grid PLC (NYSE:NGG) Q4 2019 Earnings Conference Call May 16, 2019 4:15 AM ET Company Participants Aarti Singhal - Director, IR John Pettigrew - CEO & Executive Director Andy Agg - Interim CFO, Group Tax & Treasury Director Nicola Shaw - Executive Director, UK Dean Seavers - Executive Director, US Conference Call Participants Chris Laybutt - JP Morgan Jenny Ping - Citi Fraser McLaren - Bank of America Merrill Lynch Dominic Nash - Barclays James Brand - Deutsche Bank Sam Arie - UBS Martin Young - Inv ...

nationalgrid Debt Investor Update Full Year Results 2018/19 16 May 2019 Full Year Results 2018/19 May 2019 nationalgrid Cautionary statement This presentation contains certain statements that are nether reported financial results nor other historical information. These statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. These statements include information with respect Grid's financial condition, its resu ...