| 31/10/17 | | 17:27:41 | 31 Oct 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 30/10/17 | | 17:35:40 | 30 Oct 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 27/10/17 | | 18:39:45 | 27 Oct 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 26/10/17 | | 18:50:48 | 26 Oct 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 25/10/17 | | 18:47:16 | 25 Oct 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 24/10/17 | | 18:26:56 | 24 Oct 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 23/10/17 | | 18:38:06 | 23 Oct 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 20/10/17 | | 18:18:49 | 20 Oct 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 19/10/17 | | 18:32:16 | 19 Oct 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 18/10/17 | | 18:55:24 | 18 Oct 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 16/10/17 | | 18:23:13 | 16 Oct 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 13/10/17 | | 18:41:45 | 13 Oct 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 12/10/17 | | 18:22:02 | 12 Oct 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 11/10/17 | | 18:24:15 | 11 Oct 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 10/10/17 | | 19:17:27 | 10 Oct 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 10/10/17 | | 17:00:01 | 10 Oct 2017 | | | Director/PDMR Shareholding | National Grid PLC | RNS |
| 09/10/17 | | 18:03:25 | 9 Oct 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 05/10/17 | | 11:57:45 | 5 Oct 2017 | | | Publication of ARA - Group Companies Listed Debt | National Grid PLC | RNS |
| 02/10/17 | | 15:01:16 | 2 Oct 2017 | | | Total Voting Rights | National Grid PLC | RNS |
| 28/09/17 | | 18:56:05 | 28 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 27/09/17 | | 18:27:06 | 27 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 26/09/17 | | 18:34:18 | 26 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 25/09/17 | | 18:19:29 | 25 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 22/09/17 | | 18:11:24 | 22 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 21/09/17 | | 18:17:35 | 21 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 20/09/17 | | 18:38:38 | 20 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 19/09/17 | | 18:09:26 | 19 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 18/09/17 | | 18:31:55 | 18 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 15/09/17 | | 18:29:04 | 15 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 14/09/17 | | 18:36:38 | 14 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 13/09/17 | | 18:37:18 | 13 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 13/09/17 | | 09:30:01 | 13 Sept 2017 | | | Investor teach-in event in London and New York | National Grid PLC | RNS |
| 12/09/17 | | 18:38:01 | 12 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 12/09/17 | | 10:49:28 | 12 Sept 2017 | | | Director's Other Appointment | National Grid PLC | RNS |
| 11/09/17 | | 17:00:01 | 11 Sept 2017 | | | Director/PDMR Shareholding | National Grid PLC | RNS |
| 08/09/17 | | 18:25:08 | 8 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 07/09/17 | | 18:19:59 | 7 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 06/09/17 | | 18:14:18 | 6 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 05/09/17 | | 18:26:35 | 5 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 04/09/17 | | 18:21:07 | 4 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 01/09/17 | | 18:17:45 | 1 Sept 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 01/09/17 | | 14:35:29 | 1 Sept 2017 | | | Total Voting Rights | National Grid PLC | RNS |
| 31/08/17 | | 18:15:46 | 31 Aug 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 30/08/17 | | 18:22:59 | 30 Aug 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 30/08/17 | | 17:00:01 | 30 Aug 2017 | | | Director/PDMR Shareholding | National Grid PLC | RNS |
| 29/08/17 | | 18:24:05 | 29 Aug 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 25/08/17 | | 18:22:28 | 25 Aug 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 24/08/17 | | 18:29:45 | 24 Aug 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 23/08/17 | | 18:22:42 | 23 Aug 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 22/08/17 | | 18:08:42 | 22 Aug 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
