The Grontmij share to be delisted on 19 November 2015

Stockholm, Sweden, and De Bilt, the Netherlands, 22 October 2015

Sweco AB (publ) (“Sweco”) (Nasdaq Stockholm; ticker symbol SWECA and SWECB) and Grontmij N.V. (“Grontmij”) (Euronext Amsterdam; ticker symbol GRONT) jointly announce that at the request of Sweco and Grontmij, Euronext Amsterdam N.V. has confirmed its consent to delist the ordinary shares in the capital of Grontmij (the "Shares") from Euronext in Amsterdam ("Euronext"). Such request was made now that, following the completion of Sweco’s recommended public mixed exchange and cash offer, Sweco now owns more than 95% of the Shares.

Delisting will take place on 19 November 2015 and the last day that the Shares can be traded on Euronext will therefore be 18 November 2015.

ADDITIONAL INFORMATION

Contact Details

Sweco

Communications Director

Åsa Barsness

M: +46 (0)703823686

E: asa.barsness@sweco.se

Sweco AB

Gjörwellsgatan 22,

Box 34 044

SE-100 26 Stockholm

Sweden

Grontmij

Investor   Relations

Michèle   Negen

T: +31 88   8115884

E:   michele.negen@grontmij.com

Grontmij   N.V.

De Holle   Bilt 22

3732 HM De   Bilt

The Netherlands

About Sweco

Sweco plans and designs the communities and cities of the future. Our work results in sustainable buildings, efficient infrastructure and access to electricity and clean water. With 14,500 employees in Europe, we offer our customers the right expertise for every situation. We carry out projects in 70 countries annually throughout the world. Sweco is Europe's leading architecture and engineering consultancy, with sales of approximately SEK 15.2 billion (pro forma 2014). The company is listed on NASDAQ OMX Stockholm AB. 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 22 October 2015, 15:20 CET.

For further information, visit www.swecogroup.com.