Transaction in Own Shares

RNS Number : 0696P

National Grid PLC

25 August 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 2 June 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:	25 August 2017
Number of ordinary shares of 12^204/473p each purchased:	22,753
Highest price paid per share (pence):	970.2000
Lowest price paid per share (pence):	970.2000
Volume weighted average price paid per share	970.2000

National Grid intends to hold the purchased shares in treasury. Following the purchase of these shares, National Grid holds 197,263,136 of its ordinary shares in treasury and has 3,420,306,989 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 25 August 2017 is set out below

Schedule of purchases - aggregate information

Trading venue	Volume weighted average price (pence per share)	Aggregated volume
BATS Europe	970.0000	200
Chi-X Europe	969.9080	11,162
Turquoise	970.0000	357
London Stock Exchange	969.9133	11,034

Schedule of purchases - individual transactions

Number of shares purchased	Transaction price (pence per share)	Time of transaction (BST)	Trading venue	Transaction reference number
22	970.00	09:43:50	Chi-X Europe	592166192808194000
250	970.00	09:43:50	Chi-X Europe	592166192808194000
315	970.00	09:43:50	Chi-X Europe	606239943258597000
377	970.00	09:46:08	Chi-X Europe	606239943258598000
357	970.00	09:46:35	Turquoise	592166192808195000
1,346	970.00	09:46:35	London Stock Exchange	606239943258598000
254	970.00	09:46:35	London Stock Exchange	606239943258598000
488	970.00	09:46:35	London Stock Exchange	606239943258598000
246	970.00	09:46:35	Chi-X Europe	606239943258598000
315	969.90	09:46:43	Chi-X Europe	592166192808195000
152	969.90	09:46:43	London Stock Exchange	606239943258598000
471	969.90	09:46:43	London Stock Exchange	606239943258598000
591	969.90	09:49:30	London Stock Exchange	606239943258600000
255	969.90	09:49:30	Chi-X Europe	606239943258600000
352	969.90	09:49:30	Chi-X Europe	606239943258600000
517	970.00	09:51:01	London Stock Exchange	606239943258600000
520	970.00	09:51:01	Chi-X Europe	606239943258600000
400	969.80	09:51:03	London Stock Exchange	592166192808198000
378	969.80	09:51:03	London Stock Exchange	592166192808198000
204	969.80	09:51:03	London Stock Exchange	606239943258600000
312	970.00	10:08:38	London Stock Exchange	606239943258610000
49	970.00	10:14:24	London Stock Exchange	606239943258613000
91	970.00	10:14:24	Chi-X Europe	606239943258613000
200	970.00	10:14:24	BATS Europe	606239943258613000
182	969.90	10:14:35	London Stock Exchange	592166192808210000
390	969.90	10:14:35	Chi-X Europe	592166192808210000
526	969.90	10:14:35	Chi-X Europe	606239943258613000
486	969.90	10:14:35	Chi-X Europe	606239943258613000
314	970.00	10:22:06	London Stock Exchange	592166192808216000
327	970.00	10:22:06	London Stock Exchange	606239943258618000
431	970.00	10:22:06	Chi-X Europe	606239943258618000
102	970.00	10:25:14	Chi-X Europe	592166192808217000
256	970.00	10:25:14	Chi-X Europe	592166192808217000
510	970.00	10:25:14	London Stock Exchange	606239943258620000
339	970.00	10:25:14	Chi-X Europe	606239943258620000
617	970.00	10:33:52	Chi-X Europe	606239943258625000
315	970.00	10:33:52	Chi-X Europe	592166192808222000
10	970.00	10:33:52	Chi-X Europe	606239943258625000
610	969.90	10:33:52	London Stock Exchange	592166192808222000
149	969.90	10:33:52	London Stock Exchange	592166192808222000
492	969.90	10:33:52	Chi-X Europe	592166192808222000
296	969.90	10:33:52	Chi-X Europe	606239943258625000
236	969.90	10:33:53	London Stock Exchange	592166192808222000
88	969.90	10:33:53	Chi-X Europe	592166192808222000
110	969.90	10:34:01	London Stock Exchange	592166192808222000
533	969.90	10:35:08	Chi-X Europe	606239943258625000
403	969.90	10:35:33	Chi-X Europe	592166192808223000
380	969.90	10:35:33	London Stock Exchange	606239943258626000
539	969.90	10:38:37	Chi-X Europe	592166192808225000
491	969.90	10:38:37	Chi-X Europe	606239943258627000
507	969.90	10:38:37	London Stock Exchange	606239943258627000
802	969.90	10:38:37	London Stock Exchange	606239943258627000
560	969.90	10:38:37	London Stock Exchange	592166192808225000
642	969.80	10:39:48	Chi-X Europe	592166192808226000
568	969.80	10:39:48	Chi-X Europe	592166192808226000
698	969.80	10:39:48	London Stock Exchange	606239943258628000
383	969.70	10:41:48	Chi-X Europe	592166192808227000
512	969.70	10:41:48	Chi-X Europe	606239943258629000
487	969.70	10:41:48	London Stock Exchange	606239943258629000