Holding(s) in Company

Pennon Group PLC 23 July 2007 PENNON GROUP PLC FOR IMMEDIATE RELEASE HOLDING IN COMPANY Pennon Group Plc received notification on 20 July 2007 (by fax dated 20 July 2007) that Ameriprise Financial, Inc and its Group, of which Threadneedle Asset Management Holdings Limited is the ultimate intermediate holding company in the UK, hold an interest in 35,301,271 Ordinary shares of 40.7p each in the Company. 23 July 2007 www.pennon-group.co.uk End transmission This information is provided by RNS The company news service from the London Stock Exchange

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Pennon Group (PNN)
UK 100

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