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Stantec names new infrastructure leader for North America. Talking points. Stantec has named Arliss Szysky EVP of its North American infrastructure business. Szysky, who brings 25 years' experience in transportation engineering and business operations, succeeds Susan Walter, who will now focus on major projects, client relationships and mentoring. Szysky previously served as VP and regional leader for Alberta South, then as SVP and operations leader for buildings. She now leads Stantec's largest business segment, which generated 26% of North American revenue in 2025 and employs nearly 4,800 people. * Szysky's portfolio includes landscape architecture, residential and commercial developments, ports, roads, bridges, rail and airports * She is a graduate of the Schulich School of Engineering * Susan Reisbord, Stantec's COO for North America, praises Szysky's operational rigour and strategic vision This leadership change is significant as Stantec continues to expand its infrastructure business and deliver complex projects. Powered by: Stantec has promoted Arliss Szysky, P.Eng., to executive vice-president (EVP) of its infrastructure business for North America. Based in Calgary, she succeeds Susan Walter, who will now focus on leading major projects, growing key client relationships and mentoring young engineers. Szysky has 25 years' experience in transportation engineering, project leadership and business operations. After earning her B.Sc. in transportation at the University of Calgary's Schulich School of Engineering, she worked at Watt Consulting for five years as a transportation engineer, then joined Stantec, where she rose to vice-president (VP) and regional leader for Alberta South, then SVP and operations leader for buildings. In her new role, Szysky leads Stantec's largest business in North America, which accounted for 26% of regional revenue in 2025, and is supported by a team of nearly 4,800. Her mandate spans a diverse portfolio, from landscape architecture, residential and commercial developments to ports, roads, bridges, rail and airports. "We have powerful opportunities to collaborate across the company, expand our transportation business, strengthen our community development work and build on our experience delivering projects in some of the most challenging environments, including the Arctic," she says. "I'm looking forward to continuing to evolve how we operate." "Arliss brings a rare combination of operational rigour, strategic vision and genuine care for people," says Susan Reisbord, Stantec's chief operating officer (COO) for North America. "She champions continuous improvement while creating conditions for teams to do their best work. I'm looking forward to partnering closely with Arliss as we continue to grow our infrastructure business and advance our corporate strategic plan."

Stantec names Arliss Szysky to lead Infrastructure business. Szysky brings 25 years of experience in transportation engineering, project leadership, and business operations 04/06/2026 CALGARY, AB TSX, NYSE:STN Stantec, a global leader in sustainable design and engineering, has appointed Arliss Szysky as executive vice president of its Infrastructure business in North America, marking a step forward for the firm's largest and one of its fastest-growing operating units. Szysky brings deep operational expertise and a people-first leadership approach to the role. Most recently, she served as operations leader for Stantec's North American Buildings business, where she strengthened business processes, advanced operational excellence, and supported sustained growth. She also played a key role in the successful acquisition and integration of Page, a 1,400-person architecture and engineering firm, further reinforcing Stantec's commitment to scale, collaboration, and design excellence. Infrastructure is Stantec's largest business in North America, accounting for 26 percent of regional revenue in 2025 and supported by nearly 4,800 professionals. The business spans a diverse portfolio across transportation and community development, including ports and marine, roadways and bridges, transit and rail, airports, residential and commercial development, and landscape architecture - delivering projects that connect communities and shape resilient, thriving places. "Arliss brings a rare combination of operational rigor, strategic vision, and genuine care for people," said Susan Reisbord, chief operating officer for North America. "She champions continuous improvement while creating the conditions for teams to do their best work. I'm looking forward to partnering closely with Arliss as we continue to grow our Infrastructure business and advance our corporate strategic plan." Leading growth and delivering complex projects Szysky joined Stantec in 2004 as a transportation engineer, contributing to major public and private sector projects across Western Canada. She went on to lead the Alberta South region for six years, guiding a diverse, multidisciplinary team and driving strong performance through collaboration and technical excellence. Her time serving as executive sponsor for the BMO Convention Centre Expansion in Calgary reflects her commitment to trusted client relationships and delivery of complex, high-profile projects. "It's an incredibly exciting time for our Infrastructure business," said Szysky. "We have powerful opportunities to collaborate across the Company, expand our transportation business, strengthen our community development work, and build on our experience delivering projects in some of the world's most challenging environments, including the Arctic. I'm looking forward to continuing to evolve how we operate - creating a strong, future-ready platform that supports safe, efficient, and high-quality project delivery for our clients and our people." Szysky succeeds Susan Walter, who led the Infrastructure business through six years of sustained growth and two corporate strategic plans. Under Walter's leadership, the business broadened its reach, successfully integrating Morrison Hershfield, and delivered signature projects including the Long Island Rail Road Expansion and the East Midtown Greenway. Walter will transition into a role focused on leading major projects, growing key client relationships, and mentoring the next generation of Stantec leaders. About Stantec Stantec empowers clients, people, and communities to rise to the world's greatest challenges at a time when the world faces more unprecedented concerns than ever before. Stantec is a global leader in sustainable engineering, architecture, and environmental consulting. Its professionals deliver the expertise, technology, and innovation communities need to manage aging infrastructure, demographic and population changes, the energy transition, and more. Today's communities transcend geographic borders. At Stantec, community means everyone with an interest in the work that Stantec do - from its project teams and industry colleagues to its clients and the people its work impacts. The diverse perspectives of its partners and interested parties drive Stantec to think beyond what's previously been done on critical issues like climate change, digital transformation, and future-proofing its cities and infrastructure. Stantec is designers, engineers, scientists, project managers, and strategic advisors. Stantec innovate at the intersection of community, creativity, and client relationships to advance communities everywhere, so that together Stantec can redefine what's possible. Stantec trades on the TSX and the NYSE under the symbol STN. Media Contact Colin Nekolaichuk Stantec Media Relations Ph: (437) 225-6384 [email protected]

Stantec partners with WSSC Water and Prince William Water on new Water Research Foundation AI initiative. New AI framework aims to support wastewater operations 03/26/2026 WASHINGTON, DC TSX,NYSE:STN Stantec, a global leader in sustainable design and engineering, has been selected to lead a new Water Research Foundation (WRF) project focused on applying artificial intelligence (AI) to wastewater treatment operations. The 31-month initiative is co-funded through WRF's Tailored Collaboration Program, with the Washington Suburban Sanitary Commission (WSSC Water) in Maryland and Prince William Water in Virginia serving as coleading utility partners. Stantec will combine engineering and plant operations experience with advanced AI architecture to translate treatment data into actionable operational guidance. The firm will incorporate AI capabilities from EAOS, a wastewater-focused artificial intelligence firm, to advance digitally enabled treatment operations and support real-time operational decision-making. The Tailored Collaboration Program enables utilities to propose research topics and receive matching funds from the Foundation - an approach that directly links emerging technologies to utility needs and operational priorities. For this project, WRF will support 50 percent of the total funding, with WSSC Water and Prince William Water contributing the remaining share. A client-driven research partnership to solve operational challenges The project reflects a growing industry need for AI tools that directly support operational challenges. Rather than exploring speculative technologies, the effort is grounded in issues utilities face every day, including process stability, operator support, knowledge retention, and adapting to a changing workforce. The research is shaped and co-funded by the utilities themselves. The project introduces "Intelligent Assets" - embedded digital tools that translate engineering expertise into real-time operational guidance. Utilities can implement these tools step-by-step, maintaining ownership of their data while modernizing physical infrastructure without disruptive system replacements. Stantec and its utility partners will incorporate learnings at WSSC Water's Piscataway Water Resource Recovery Facility, and Prince William Water's H.L. Mooney Advanced Water Reclamation Facility - both of which are positioned to integrate digital intelligence during ongoing upgrades. Additional observer utilities from all regions in the US will be invited to participate throughout the project, helping insights and outcomes to be replicated more broadly. Utilities can reach out to Stantec if they'd like to play an observer role. "At its core, this project is about practical innovation grounded in operations," said Pusker Regmi, Stantec vice president and principal investigator. "By bringing together engineering, plant experience, and artificial intelligence, we're creating tools that operators can trust to manage increasingly complex facilities." The final deliverables will include a WRF research report and a Utility AI Implementation Playbook - providing technical guidance, case studies, return on investment methods, and templates to help utilities of all sizes chart a clear path for AI adoption. About Stantec Stantec empowers clients, people, and communities to rise to the world's greatest challenges at a time when the world faces more unprecedented concerns than ever before. Stantec is a global leader in sustainable engineering, architecture, and environmental consulting. Its professionals deliver the expertise, technology, and innovation communities need to manage aging infrastructure, demographic and population changes, the energy transition, and more. Today's communities transcend geographic borders. At Stantec, community means everyone with an interest in the work that Stantec do - from its project teams and industry colleagues to its clients and the people its work impacts. The diverse perspectives of its partners and interested parties drive Stantec to think beyond what's previously been done on critical issues like climate change, digital transformation, and future-proofing its cities and infrastructure. Stantec is designers, engineers, scientists, project managers, and strategic advisors. Stantec innovate at the intersection of community, creativity, and client relationships to advance communities everywhere, so that together Stantec can redefine what's possible. Stantec trades on the TSX and the NYSE under the symbol STN. Media Contact Sean Fitzgerald Stantec Media Relations Ph: (416) 598-5769 [email protected]