DREAM BIG. NOW DREAM BETTER. Shaping the world of things to come — no matter what we're building. AVIATION CIVIL CULTURAL + PERFORMING ARTS DATA CENTERS Mortenson was very creative throughout the project in finding ways to stretch our dollars to the maximum benefit…It was clear that the Mortenson team members were always doing their best to get us the best outcome for our investment. JOE DIEKER, CORNELL COLLEGE CAREERS We're expanding the universe of big ideas. At Mortenson, we believe that each of us is called to be a leader — and that together, everything is possible. What will you build? LET'S REDEFINE POSSIBLETM Information regarding COVID-19 and Tracking the impact of COVID-19 Login Careers Code of Ethics Privacy Policy © 2021 M. A. Mortenson Company. All rights reserved.

Code of Ethics Mortenson has a strong heritage that reflects generations of hard work and accomplishments in the construction business. Together, we have established a reputation for integrity and fairness, reliable performance, and quality results. Our Code of Ethics and Business Conduct provides guidance on expected behaviors, and on doing the right thing to maintain and enhance our reputation for integrity and fairness. To view the Code of Ethics and Business Conduct, click on one of the links below: Code of Ethics and Business Conduct Code de deontologie et de conduite des affaires (Code of Ethics, French) Codigo de etica y conducta profesional (Code of Ethics, Spanish) Information regarding COVID-19 and Tracking the impact of COVID-19 Login Careers Code of Ethics Privacy Policy © 2021 M. A. Mortenson Company. All rights reserved.

LET'S BEND THE ARC OF POSSIBLE. STRAIGHT UP. We believe partnership and collaborative ingenuity are the keys to unlocking potential — whether we're called to a jobsite or a boardroom. By continually investing in new solutions, we're changing the landscape of what's possible — from the ground up. DAN JOHNSON, PRESIDENT + CEO ABOUT MORTENSON SENIOR LEADERSHIP BUILDING FOR THE GREATER GOOD COMMUNITY AFFAIRS WHERE WE WORK CAREERS Go limitless. Find your career here. LET'S REDEFINE POSSIBLETM Information regarding COVID-19 and Tracking the impact of COVID-19 Login Careers Code of Ethics Privacy Policy © 2021 M. A. Mortenson Company. All rights reserved.