4M Building Solutions, a leader in the commercial cleaning and janitorial service industry, has acquired FKI Cleaning Services, a trusted, customer-focused cleaning provider serving Franklin, Warren, and St. Louis counties.

With this acquisition, 4M Building Solutions expands its footprint in Missouri’s east-central region. Headquartered in St. Louis and operating since 1978, 4M already maintains a strong market presence throughout the state. The integration of FKI Cleaning Services brings more than 80 client accounts and 46 Team Members into the 4M organization, further strengthening its service capacity and regional coverage.

“FKI Cleaning Services is a natural fit for 4M. Their outstanding reputation in Washington and the surrounding areas speaks for itself, and their customer-first approach aligns perfectly with our culture and commitment to excellence,” said Tim Murch, CBSE, CEO and managing partner of 4M. “As we continue to grow in our home state of Missouri, it’s satisfying to welcome a company so deeply rooted in the local community. We’re excited to build on the foundation they’ve created and bring even more value to the clients and Team Members who made that success possible.”

FKI Cleaning Services was founded in January 2010 by brothers Shawn Thiemann, president and owner, and Casey Thiemann, operations director and partner. The company’s roots started as a family business. Their father, Steve, a longtime police officer in the community,  retired to start a small janitorial company called Four Kings Inc. With his sudden passing in 2009, the family faced a pivotal moment. At the time, Shawn was working for a food company in Kansas City. He and his wife, Amy, moved back to Washington to help his mother, Joy, manage the business. Together with Casey, they restructured and evolved Four Kings Inc. into a new company, FKI Cleaning Services. Amy stepped in as HR Director, a role she held for nine years, and their mom played a key part in supporting the business in its early years. That original four-person operation has since grown to 46 employees.

The company has established a robust client base across various industries, including schools, medical facilities, financial institutions, and city administration buildings. Known for its customized approach and commitment to quality, FKI offers comprehensive commercial cleaning and janitorial services, including carpet and floor care.

Nearly all FKI frontline Team Members will transfer to 4M, which will continue operations from FKI’s current office, 1642 E. 5th Street in Washington.

FKI President Shawn Thiemann will step down shortly after the sale of the business. His brother, Casey Thiemann, will remain with 4M as a District Manager, covering Franklin County and other communities in east-central Missouri.

“It’s been an incredible privilege to build FKI alongside my wife, brother, and, in the early days, with the help of our mom,” said Shawn Thiemann, president and owner. “We’ve poured our hearts into creating a company grounded in trust, quality, and community service. Most of all, it’s been meaningful to build a business that I know would make our dad proud.

“As I step away, I know our employees and clients are in great hands. 4M shares our values and brings tremendous opportunity for our team’s continued growth and success,” Thiemann added.

The acquisition of FKI Cleaning Services marks the 38th acquisition for 4M Building Solutions since its founding in 1978. It also reflects the company’s continued strategic growth following a significant investment in January 2023 from O2 Investment Partners, a Midwestern-based private investment firm.

About 4M Building Solutions:

4M Building Solutions is a full-service cleaning, janitorial, housekeeping, and disinfection services company headquartered in St. Louis, Mo. Founded in 1978, it has become one of the nation’s largest janitorial service companies, operating in 27 states east of Kansas. More than 7,000 Team Members provide daily, environmentally friendly cleaning to 222 million square feet of space in business segments including industrial/manufacturing, logistics/distribution, education, corporate owner-occupied, medical healthcare, senior living, and multi-tenant buildings. For more information, visit www.4-m.com.