4M Building Solutions Acquires Covenant Building Service

O2 Investment Partners Invests in 4M Building Solutions

January 18, 2023

Professional Services

O2 Investment Partners has made a significant growth investment in 4M Building Solutions, a St. Louis-based commercial cleaning, janitorial, and housekeeping services company. The capital will support 4M’s organic growth and acquisition strategy while the company continues to operate under its existing leadership; terms were not disclosed.

4M Building Solutions Acquires Calvary Building Services

August 1, 2025

Professional Services

4M Building Solutions, a St. Louis–based commercial cleaning platform backed by O2 Investment Partners, has acquired Grand Rapids, Michigan–based Calvary Building Services. The add-on strengthens 4M's presence in West Michigan and brings Calvary's ~79 frontline team members and long‑tenured client contracts onto 4M's platform.

O2-backed 4M Building Solutions Acquires Capital Services

May 30, 2023

Environmental Services

O2 Investment Partners (through its portfolio company 4M Building Solutions) has made an investment in and partnered with Capital Services, a Columbus, Ohio-based janitorial and cleaning services provider. Terms were not disclosed; the deal expands 4M's footprint in central Ohio and brings Capital Services into 4M's platform following O2's prior investment in 4M.

4M Building Solutions Acquires Horizon Services Corporation

June 11, 2024

Industrial Services

4M Building Solutions, backed by O2 Investment Partners, has acquired Horizon Services Corporation, a commercial cleaning and facilities services provider headquartered in East Hartford, Connecticut. Horizon will retain its leadership and brand while its leadership team and select executives become equity holders; the deal is 4M's fourth add-on since O2's growth investment in January 2023.

4M Building Solutions Acquires SG360

May 3, 2024

Environmental Services

4M Building Solutions has acquired SG360, a commercial cleaning and janitorial services provider based in Overland Park, Kansas. The deal — executed through 4M's PE-backed acquisition platform — adds roughly 1,200 team members, expands 4M's footprint into five new states and broadens its Midwest and Southeast operations.

4M Building Solutions Acquires Miracle Clean Services and FKI Cleaning Services

August 19, 2025

Environmental Services

4M Building Solutions, the St. Louis–based commercial cleaning platform backed by O2 Investment Partners, acquired Akron, Ohio–based Miracle Clean Services and Washington, Missouri–based FKI Cleaning Services. The transactions are add-on acquisitions intended to expand 4M's geographic footprint and bring additional team members, client contracts, and operational capabilities onto the 4M platform; terms were not disclosed.