Sweco

Declaration of Voting Results & Voting Rights Announcements • May 31, 2012

PRESS RELEASE

31 May 2012

Number of shares and votes in Sweco after conversion

At the request of a shareholder, 4,012 class A shares have been converted to class B shares during May 2012 with the support of the conversion clause in the Articles of Association. The total number of votes thereafter amounts to 17,595,182.3, of which the class A shares correspond to 9,381,664 votes and the class B shares to 8,213,518.3 votes. The total number of shares is 91,516,847, of which 9,381,664 are of class A and 82,135,183 are of class B.

On the date of publication of this information, Sweco holds 174,000 class B shares in treasury. However, Sweco has no voting rights for the class B treasury shares. The share capital amounts to SEK 91,516,847.

For further information please contact: Lisa Lagerwall, General Counsel, Sweco, 08-695 66 16, 0734-12 66 16, lisa.lagerwall@sweco.se

Fredrik Hedlund, Head of Corporate Communications, Sweco, 08-695 66 12, 0734-12 66 12, fredrik.hedlund@sweco.se

Sweco is an international consulting group with combined expertise in consulting engineering, environmental technology and architecture. Sweco has annual sales of approximately SEK 6.7 billion and close to 7,600 employees in 12 countries. The company has projects currently underway in some 80 countries worldwide. Sweco is listed on NASDAQ OMX Stockholm AB.

Sweco discloses the information provided herein pursuant to the Securities Markets Act and/or the Financial Instruments Trading Act. The information was issued for publication on 31 May 2012, at 08:30 CET.

Telefon 08-695 60 00 E-post info@sweco.se www.swecogroup.com