| 27/12/17 | | 17:30:42 | 27 Dec 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 22/12/17 | | 13:11:36 | 22 Dec 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 21/12/17 | | 17:38:02 | 21 Dec 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 20/12/17 | | 17:32:45 | 20 Dec 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 18/12/17 | | 17:29:45 | 18 Dec 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 15/12/17 | | 17:21:47 | 15 Dec 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 14/12/17 | | 17:29:54 | 14 Dec 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 13/12/17 | | 17:22:28 | 13 Dec 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 11/12/17 | | 17:46:30 | 11 Dec 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 08/12/17 | | 17:29:53 | 8 Dec 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 08/12/17 | | 16:00:01 | 8 Dec 2017 | | | Director/PDMR Shareholding | National Grid PLC | RNS |
| 07/12/17 | | 17:47:04 | 7 Dec 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 06/12/17 | | 17:23:49 | 6 Dec 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 05/12/17 | | 17:18:41 | 5 Dec 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 04/12/17 | | 17:17:56 | 4 Dec 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 04/12/17 | | 16:00:01 | 4 Dec 2017 | | | Director/PDMR Shareholding | National Grid PLC | RNS |
| 01/12/17 | | 17:22:16 | 1 Dec 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 01/12/17 | | 13:24:12 | 1 Dec 2017 | | | Total Voting Rights | National Grid PLC | RNS |
| 30/11/17 | | 17:31:53 | 30 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 30/11/17 | | 13:00:01 | 30 Nov 2017 | | | Scrip Dividend for 2017/18 Interim Dividend | National Grid PLC | RNS |
| 29/11/17 | | 17:19:27 | 29 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 28/11/17 | | 17:26:26 | 28 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 28/11/17 | | 17:03:52 | 28 Nov 2017 | | | Holding(s) in Company | National Grid PLC | RNS |
| 28/11/17 | | 07:00:03 | 28 Nov 2017 | | | Rate Filing Submitted for Rhode Island | National Grid PLC | RNS |
| 27/11/17 | | 17:26:33 | 27 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 24/11/17 | | 17:25:51 | 24 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 23/11/17 | | 17:25:56 | 23 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 23/11/17 | | 10:58:51 | 23 Nov 2017 | | | Director/PDMR Shareholding | National Grid PLC | RNS |
| 22/11/17 | | 17:21:16 | 22 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 21/11/17 | | 17:33:47 | 21 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 20/11/17 | | 17:41:38 | 20 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 20/11/17 | | 17:41:08 | 20 Nov 2017 | | | Holding(s) in Company | National Grid PLC | RNS |
| 17/11/17 | | 17:24:23 | 17 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 16/11/17 | | 17:30:39 | 16 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 16/11/17 | | 07:00:03 | 16 Nov 2017 | | | Rate filing submitted for Massachusetts Gas | National Grid PLC | RNS |
| 15/11/17 | | 17:17:20 | 15 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 15/11/17 | | 16:00:01 | 15 Nov 2017 | | | Director/PDMR Shareholding | National Grid PLC | RNS |
| 14/11/17 | | 17:32:51 | 14 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 13/11/17 | | 17:27:20 | 13 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 10/11/17 | | 17:36:54 | 10 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 09/11/17 | | 17:49:58 | 9 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 09/11/17 | | 07:00:08 | 9 Nov 2017 | | | Half Year Results 2017/18 | National Grid PLC | RNS |
| 08/11/17 | | 17:37:54 | 8 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 07/11/17 | | 18:23:18 | 7 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 06/11/17 | | 17:38:49 | 6 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 06/11/17 | | 09:33:42 | 6 Nov 2017 | | | Director's Other Appointment | National Grid PLC | RNS |
| 03/11/17 | | 17:26:57 | 3 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 02/11/17 | | 17:29:10 | 2 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 01/11/17 | | 17:32:02 | 1 Nov 2017 | | | Transaction in Own Shares | National Grid PLC | RNS |
| 01/11/17 | | 15:54:36 | 1 Nov 2017 | | | Total Voting Rights | National Grid PLC | RNS |
