Mortenson is a US-based construction company and provider of turnkey engineering services for multiple industries, including semiconductor, electric vehicles and data centres. The company also has experience building wastewater treatment plants. Within the semiconductor industry, its offerings include utility supply expansion, process waste treatment, clean room expansion and builds, and expansion of power distribution capacity.

Its develop-design-build solutions are used to provide expertise for process, mechanical, cleanroom, chemical distribution, specialty gases, ultrapure water, and wastewater treatment systems.

In 2024, Mortenson partnered with Polar Semiconductor, based in Bloomington, MN on a $525M expansion of Polars manufacturing facility, leveraging its experience in clean room technology and construction to help Polar Semiconductor to compete for CHIPS and Science Act funding.