Transaction in Own Shares

RNS Number : 7765X

National Grid PLC

28 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:	28 November 2017
Number of Ordinary shares of 12^204/473p each purchased:	22,637
Highest price paid per share (pence):	880.9931
Lowest price paid per share (pence):	880.9931
Volume weighted average price paid per share:	880.9931

National Grid intends to hold the purchased shares in treasury. Following the purchase of these shares, National Grid holds 231,354,293 of its ordinary shares in treasury and has 3,386,215,832 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 28 November 2017 is set out below.

Schedule of purchases - aggregate information

Trading venue	Volume weighted average price (pence per share)	Aggregated volume
BATS Europe	871.8427	1,063
Chi-X Europe	874.5000	147
Turquoise	873.3000	224
London Stock Exchange	873.3220	21,203

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
279	870.00	08:00:31	London Stock Exchange	592199827521194000
214	870.00	08:00:31	London Stock Exchange	606273577966327000
236	870.00	08:00:31	London Stock Exchange	592199827521194000
335	870.00	08:00:32	London Stock Exchange	592199827521194000
106	869.50	08:00:41	BATS Europe	606273577966327000
47	869.70	08:01:01	London Stock Exchange	592199827521194000
349	872.30	08:02:42	London Stock Exchange	606273577966330000
794	872.00	08:02:42	BATS Europe	592199827521196000
224	873.30	08:03:07	Turquoise	592199827521196000
126	873.30	08:03:07	London Stock Exchange	606273577966330000
175	874.20	08:04:02	London Stock Exchange	592199827521197000
174	874.20	08:04:03	London Stock Exchange	606273577966331000
82	874.40	08:04:12	London Stock Exchange	592199827521197000
715	874.40	08:04:12	London Stock Exchange	592199827521197000
728	873.70	08:04:29	London Stock Exchange	592199827521198000
1,054	873.90	08:04:29	London Stock Exchange	606273577966331000
698	874.10	08:05:44	London Stock Exchange	592199827521199000
410	873.00	08:06:00	London Stock Exchange	592199827521200000
349	873.00	08:06:00	London Stock Exchange	606273577966333000
359	872.90	08:06:28	London Stock Exchange	592199827521200000
767	872.90	08:06:28	London Stock Exchange	592199827521200000
739	872.40	08:06:32	London Stock Exchange	592199827521200000
456	871.60	08:08:08	London Stock Exchange	606273577966335000
296	871.60	08:08:08	London Stock Exchange	606273577966335000
699	872.70	08:09:46	London Stock Exchange	606273577966337000
699	872.00	08:10:32	London Stock Exchange	592199827521204000
698	872.30	08:11:00	London Stock Exchange	592199827521205000
36	873.00	08:12:18	London Stock Exchange	606273577966339000
662	873.00	08:12:18	London Stock Exchange	606273577966339000
2	872.70	08:12:33	London Stock Exchange	592199827521206000
630	872.70	08:12:33	London Stock Exchange	592199827521206000
67	872.70	08:12:33	London Stock Exchange	592199827521206000
155	872.60	08:12:33	London Stock Exchange	606273577966340000
90	872.60	08:12:33	London Stock Exchange	606273577966340000
648	872.60	08:12:33	London Stock Exchange	606273577966340000
65	872.60	08:12:33	London Stock Exchange	606273577966340000
163	872.60	08:12:33	BATS Europe	606273577966340000
89	873.20	08:15:47	London Stock Exchange	592199827521209000
704	873.20	08:15:56	London Stock Exchange	592199827521209000
548	873.20	08:15:56	London Stock Exchange	592199827521209000
150	873.20	08:15:56	London Stock Exchange	592199827521209000
698	872.90	08:15:56	London Stock Exchange	592199827521209000
1,038	873.60	08:16:49	London Stock Exchange	592199827521210000
97	874.50	08:19:35	Chi-X Europe	592199827521212000
50	874.50	08:19:35	Chi-X Europe	592199827521212000
349	875.00	08:22:26	London Stock Exchange	592199827521215000
644	875.00	08:22:26	London Stock Exchange	592199827521215000
54	875.00	08:22:26	London Stock Exchange	592199827521215000
894	874.90	08:22:26	London Stock Exchange	592199827521215000
444	874.80	08:22:43	London Stock Exchange	606273577966348000
254	874.80	08:22:43	London Stock Exchange	606273577966348000
698	875.00	08:25:27	London Stock Exchange	592199827521217000
300	875.00	08:26:10	London Stock Exchange	606273577966351000
49	875.00	08:26:10	London Stock Exchange	606273577966351000
349	874.70	08:26:39	London Stock Exchange	606273577966352000
204	874.50	08:26:40	London Stock Exchange	592199827521219000
698	874.90	08:27:17	London Stock Exchange	592199827521220000