Transaction in Own Shares

RNS Number : 7084Z

National Grid PLC

18 December 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:	18 December 2017
Number of Ordinary shares of 12^204/473p each purchased:	14,991
Highest price paid per share (pence):	870.7602
Lowest price paid per share (pence):	870.7602
Volume weighted average price paid per share:	870.7602

National Grid intends to hold the purchased shares in treasury. Following the purchase of these shares, National Grid holds 239,300,558 of its ordinary shares in treasury and has 3,378,269,567 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 18 December 2017 is set out below.

Schedule of purchases - aggregate information

Trading venue	Volume weighted average price (pence per share)	Aggregated volume
BATS Europe	867.7000	400
Chi-X Europe	867.7192	3,822
London Stock Exchange	867.4960	10,769

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
163	868.00	09:37:55	Chi-X Europe	592206905409148000
979	868.00	09:37:55	Chi-X Europe	606280655854618000
402	867.90	09:37:55	Chi-X Europe	606280655854618000
460	867.60	09:37:55	London Stock Exchange	592206905409148000
368	867.60	09:37:55	London Stock Exchange	592206905409148000
315	867.70	09:37:55	London Stock Exchange	592206905409148000
336	867.40	09:37:58	London Stock Exchange	592206905409149000
330	867.40	09:37:58	London Stock Exchange	592206905409149000
332	867.40	09:37:58	London Stock Exchange	592206905409149000
109	867.40	09:37:58	London Stock Exchange	592206905409149000
448	867.40	09:37:59	London Stock Exchange	606280655854618000
1,434	868.00	09:38:37	London Stock Exchange	592206905409149000
332	867.50	09:39:32	London Stock Exchange	606280655854619000
336	867.50	09:39:32	London Stock Exchange	606280655854619000
251	867.50	09:39:37	London Stock Exchange	606280655854619000
160	867.50	09:39:38	Chi-X Europe	592206905409150000
48	867.40	09:39:39	London Stock Exchange	606280655854619000
1,058	867.50	09:39:48	Chi-X Europe	606280655854620000
1,168	867.60	09:40:35	London Stock Exchange	606280655854621000
1,060	867.60	09:40:35	Chi-X Europe	592206905409152000
314	867.50	09:40:35	London Stock Exchange	606280655854621000
860	867.50	09:40:35	London Stock Exchange	606280655854621000
179	867.10	09:40:35	London Stock Exchange	606280655854621000
1,129	866.80	09:40:40	London Stock Exchange	606280655854621000
382	866.80	09:40:40	London Stock Exchange	606280655854621000
995	867.70	09:41:33	London Stock Exchange	592206905409153000
31	867.70	09:41:33	London Stock Exchange	592206905409153000
500	867.60	09:41:33	London Stock Exchange	592206905409153000
400	867.70	09:41:33	BATS Europe	606280655854622000
112	867.60	09:41:33	London Stock Exchange	606280655854622000