Mr. Alain Michaud reports

WSP PROVIDES REGULATORY UPDATE ON ITS PROPOSED COMBINATION WITH ARCADIS

WSP Global Inc. has reconfirmed, following its announcement on July 24, 2026, its intention to pursue a combination with Arcadis through a friendly, recommended public offer for the entire issued and outstanding share capital of Arcadis. This press release constitutes the mandatory four-week update required by the Dutch public offer rules.

WSP remains convinced that a combination of Arcadis and WSP represents a highly compelling opportunity for both companies and their stakeholders. The proposed combination would create significantly enhanced scale, increased diversification and resilience, broader capabilities across verticals, and an expanded and more balanced geographic platform across North America, Europe and Australia that is uniquely equipped to invest for growth in talent and digital innovation and to meet continuously evolving and increasingly complex client needs through deeper, more efficient and more comprehensive solutions, to the benefit of all stakeholders, including employees, customers, partners, shareholders and communities. Further, the industrial logic of a combination has only strengthened as clients increasingly seek partners with greater scale, broader technical capabilities and global delivery platforms.

Despite multiple invitations over the past several months, the Arcadis boards have not yet engaged with WSP regarding its proposals. WSP continues to seek constructive engagement to determine whether a mutually agreeable transaction can be achieved. WSP believes that the strategic rationale, value-creation opportunity and beneficial impact on all stakeholders underlying a combination of Arcadis and WSP can only be fully realized through a negotiated transaction supported by the Arcadis boards.

WSP will proceed with the preparation of the offer memorandum in relation to the transaction, which it intends to submit to the AFM for review and approval no later than Oct. 15, 2026.

Further announcements will be made if and when appropriate or required.

About WSP Global Inc.

WSP is one of the world's leading engineering, science and infrastructure solutions firms, uniting its multidisciplinary expertise to shape communities to advance humanity. From local beginnings to a globe-spanning presence today, WSP operates in over 50 countries and employs approximately 83,000 professionals, known as Visioneers. Together, they pioneer solutions and deliver innovative projects in the transportation, infrastructure, environment, building, energy, water, mining and metals sectors. WSP is publicly listed on the Toronto Stock Exchange (symbol: WSP).

We seek Safe Harbor.