Transaction in Own Shares

RNS Number : 2845X

National Grid PLC

22 November 2017

National Grid plc ("National Grid")

ISIN Code: GB00BDR05C01

Transaction in Own Shares

National Grid announces that it has purchased the following number of its ordinary shares of 12^204/473p each on the London Stock Exchange from Barclays Capital Securities Limited ("Barclays") as part of its buy-back programme announced on 9 October 2017. The sole purpose of the programme is, as previously announced, to reduce the share capital of National Grid as part of the return of proceeds to shareholders following the sale of a majority interest in National Grid's UK gas distribution business.

Date of purchase:	22 November 2017
Number of Ordinary shares of 12^204/473p each purchased:	21,971
Highest price paid per share (pence):	884.1753
Lowest price paid per share (pence):	884.1753
Volume weighted average price paid per share:	884.1753

National Grid intends to hold the purchased shares in treasury. Following the purchase of these shares, National Grid holds 229,480,403 of its ordinary shares in treasury and has 3,388,089,722 ordinary shares in issue (excluding treasury shares).

A schedule of individual trades carried out by Barclays (BARCGBN1) as principal in connection with the above purchases on 22 November 2017 is set out below.

Schedule of purchases - aggregate information

Trading venue	Volume weighted average price (pence per share)	Aggregated volume
Chi-X Europe	879.5934	2,314
London Stock Exchange	878.6965	19,657

Schedule of purchases - individual transactions

Number of shares purchased	Transaction price (pence per share)	Time of transaction (including time zone)	Trading venue	Transaction reference number
803	874.90	08:00:25	London Stock Exchange	606271454601809000
243	874.50	08:00:25	London Stock Exchange	606271454601809000
364	875.00	08:00:28	London Stock Exchange	606271454601810000
700	875.00	08:00:28	London Stock Exchange	606271454601810000
196	875.00	08:00:28	London Stock Exchange	606271454601810000
707	873.40	08:00:52	London Stock Exchange	606271454601810000
686	878.20	08:04:54	London Stock Exchange	606271454601817000
854	878.00	08:04:54	London Stock Exchange	606271454601817000
703	878.30	08:04:55	London Stock Exchange	606271454601817000
949	878.80	08:05:43	London Stock Exchange	606271454601818000
744	878.60	08:06:17	London Stock Exchange	606271454601819000
765	879.40	08:06:52	London Stock Exchange	606271454601819000
905	880.00	08:19:38	London Stock Exchange	606271454601836000
686	880.00	08:19:38	London Stock Exchange	606271454601836000
686	879.90	08:19:38	London Stock Exchange	606271454601836000
755	879.70	08:21:12	London Stock Exchange	606271454601838000
769	879.70	08:21:58	London Stock Exchange	606271454601839000
686	880.00	09:11:12	London Stock Exchange	606271454601888000
686	880.00	09:11:12	London Stock Exchange	606271454601888000
426	879.70	09:17:32	London Stock Exchange	606271454601894000
73	879.70	09:17:32	London Stock Exchange	606271454601894000
355	879.70	09:17:32	Chi-X Europe	592197704154920000
704	879.60	09:17:47	London Stock Exchange	606271454601895000
70	879.60	09:17:47	Chi-X Europe	592197704154920000
230	879.60	09:17:47	Chi-X Europe	592197704154920000
86	879.60	09:17:48	Chi-X Europe	592197704154920000
27	879.60	09:17:48	London Stock Exchange	606271454601895000
168	879.70	09:18:20	London Stock Exchange	606271454601895000
696	879.70	09:18:21	London Stock Exchange	606271454601895000
451	879.30	09:19:38	London Stock Exchange	606271454601896000
437	879.30	09:19:38	Chi-X Europe	606271454601896000
720	879.80	09:22:50	London Stock Exchange	606271454601899000
22	879.80	09:22:50	London Stock Exchange	606271454601899000
422	879.90	09:25:48	London Stock Exchange	606271454601902000
355	879.90	09:25:54	London Stock Exchange	606271454601902000
28	879.80	09:25:54	London Stock Exchange	606271454601902000
658	879.80	09:27:42	London Stock Exchange	606271454601903000
686	879.60	09:28:48	London Stock Exchange	606271454601904000
734	879.60	09:28:48	Chi-X Europe	606271454601904000
853	879.80	09:29:50	London Stock Exchange	606271454601905000
402	879.80	09:31:15	Chi-X Europe	592197704154928000
481	879.80	09:31:15	London Stock Exchange	606271454601906000