- The Stevenson Group Acquired By Digital Benefit Advisors
- The Stewart Organization Acquisitions
- The Stockton Terminal & Eastern Railroad Acquired By OmniTRAX
- The Stockyard Horticultural Supply Acquired By SiteOne Landscape Supply
- The Stop & Shop Supermarket Company Acquisitions
- The Storage Acquisition Group Acquisitions
- The Storage Fox Acquired By Clutter
- The Strategic Solution Acquired By Grace Hill
- The Straub Acquisitions
- The Strawhecker Group Acquisitions
- The Stride Rite Acquisitions
- The Strober Organization Acquisitions
- The Stronach Group Acquisitions
- The Stryze Group Acquired By Razor Group
- The Student Loan Acquired By Discover Financial Services
- The Studer Group Acquired By Huron Consulting Group
- The Studio Director Acquired By EverCommerce
- The Suburban Collection Acquisitions
- The Suburban Collection - 56 Dealership Franchise Acquired By Lithia Motors
- The Sugar Lab Acquired By 3D Systems
- The Sumaira Foundation Acquisitions
- The Sumitomo Bank of California Acquired By California Bank & Trust
- The Sumitomo Warehouse Acquisitions
- The Summit Group Acquisitions
- The Summit Group Communications Acquired By Parpia Marketing Management
- The Sun Products Acquisitions
- The Sunbelt Companies Acquired By Pelican Products
- The Sunflower Group Acquisitions
- The Sunrider Acquisitions
- The Sunrock Group Acquisitions
- The Super Plumber Acquired By Right Time Heating and Air Conditioning Canada
- The Supply Guy Acquired By Foundation Building Materials
- The Supreme Cannabis Acquisitions
- The Surveillance Business Acquired By Marlin Equity Partners
- The Survey Group Acquired By Digital Insurance
- The Swatch Group Acquisitions
- The Swedish Co-operative Union Acquisitions
- The Sweetwater Acquired By Primo Water
- The Swim Collective Trade Shows Acquired By Emerald Expositions
- The Switch Acquisitions
