Steel Master Finland Ltd was founded by Esa Tuominen in 1995. The company started its operation as a steel structure manufacturer, but soon expanded its services to the construction of module-based machine units. As the demand for the units grew, the company outgrew its facilities and decided to move into larger premises in Mynämäki in 1999. Steel Master Marine Ltd was founded in 2014, following a business acquisition. In 2015, the business was passed on to the next generation as Esa’s sons Markus, Matias and Tuomas assumed a larger role in the company.