Sweco

Prospectus • Aug 3, 2015

This announcement does not constitute an offer, or any solicitation of any offer, to sell, buy or subscribe for any securities in Grontmij N.V. or Sweco AB. Any offer will be made only by means of an offer memorandum. This announcement is not for release, publication or distribution, in whole or in part, in or into, directly or indirectly, Canada, Japan and the United States.

PRESS RELEASE

3 August 2015

Sweco publishes supplementary prospectus

Sweco AB (publ) ("Sweco") has prepared a supplementary prospectus supplementing the prospectus which was approved by the Swedish Financial Supervisory Authority (the "SFSA") on 10 July 2015 in relation to the admittance to trading on Nasdaq Stockholm of the new class B shares in Sweco to be issued as consideration in the previous announced public offer for all the shares in Grontmij N.V. ("Grontmij"). The supplementary prospectus constitutes a part of, and shall be read together with, the prospectus.

The supplementary prospectus has been prepared in connection with that Sweco, on 17 July 2015, and Grontmij, on 3 August 2015, published their respective interim reports for the first half of the 2015 financial year (1 January 2015 – 30 June 2015).

The supplementary prospectus has been approved by the SFSA and will be available electronically at the SFSA website www.fi.se and is available at Sweco's website www.swecogroup.com.

Contact details

Åsa Barsness, Communications Director, M: +46 (0)703823686, E: asa.barsness@sweco.se

About Sweco

Sweco is the Nordic region's leading provider of services for sustainable engineering and design. Our 9,000 engineers, architects and environmental experts develop value-creating solutions for our clients and for society. Sweco is among the ten largest consulting engineering companies in Europe, carrying out assignments in 80 countries annually throughout the world. The company has annual sales of approximately SEK 9 billion and is listed on Nasdaq Stockholm. Sweco is required to disclose the above information under the provisions of the Securities Market Act and/or the Financial Instruments Trading Act. The information was submitted for publication on 3 August 2015, 08:30 CET.

For further information, visit www.swecogroup.com.