Transaction in Own Shares

RNS Number : 1643Q

National Grid PLC

07 September 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:	07 September 2017
Number of ordinary shares of 12^204/473p each purchased:	2,046
Highest price paid per share (pence):	976.9735
Lowest price paid per share (pence):	976.9735
Volume weighted average price paid per share	976.9735

National Grid intends to hold the purchased shares in treasury. Following the purchase of these shares, National Grid holds 200,197,336 of its ordinary shares in treasury and has 3,417,372,789 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 07 September 2017 is set out below

Schedule of purchases - aggregate information

Trading venue	Volume weighted average price (pence per share)	Aggregated volume
London Stock Exchange	969.8739	2,046

Schedule of purchases - individual transactions

Number of shares purchased	Transaction price (pence per share)	Time of transaction (BST)	Trading venue	Transaction reference number
172	968.50	08:00:10	London Stock Exchange	606244543875595000
937	970.00	08:05:10	London Stock Exchange	592170793435273000
451	970.00	08:05:10	London Stock Exchange	606244543875598000
486	970.00	08:05:10	London Stock Exchange	606244543875598000