Disclosure under chapter 2 section 9 of the securities market act Uponor Corporation has received from Sampo Life Insurance Company Ltd the attached notification referred to in Chapter 2, Section 9 of the Securities Markets Act on a change in holdings. For additional information, please contact: Jyri Luomakoski, CFO and Deputy CEO, Tel +358 40 515 4498 Uponor Corporation Communications Tel. +358(0)20 129 2854 DISTRIBUTION Helsinki Stock Exchange Media www.uponor.com ANNEX: Sampo Life Insurance Company Ltd's disclosure In Helsinki, 24 May 2007 NOTIFICATION REFERRED TO IN CHAPTER 2, SECTION 9, OF THE SECURITIES MARKETS ACT ON A CHANGE IN HOLDINGS As a result of a share transaction concluded 23 May 2007, the holdings of Sampo Life Insurance Company Ltd, part of the Sampo Group, represent less than 5 % of the voting rights and share capital in Uponor Corporation. Under chapter 2, section 9, of the Securities Markets Act, we hereby notify the Financial Supervision and Uponor Corporation of the following: 1. Name of target company: Uponor Corporation, business identity code 0148731-6 2. Date of change in holdings: 23 May 2007 3. Exact proportion of voting rights and share capital in Uponor Corporation The holdings of Sampo Life Insurance Company Ltd in Uponor Corporation are follows: Number of shares: 3,449,117 Proportion of share capital: 4.71% Proportion of voting rights: 4.71% The share capital of Uponor Corporation as of today comprises a total of 73,206,944 issued shares, said shares entitling to a total of 73,206,944 votes. Information is based on trade register data of 23 May 2007. 4. Shareholder's complete name, trade register number Sampo Life Insurance Company Ltd, 0641130-2