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Founded in 1947, Oak Hills Carton Co. is an independent, locally owned packaging manufacturer that produces custom folding cartons and paperboard air filter frames. The Cincinnati company operates a 40,000-square-foot facility and has manufactured air filter frames since 1989, producing more than four million sets in a reported year. It also provides packaging design and short-run production services.
Oak's Welding performs industrial manufacturing and steel fabrication, including machining, welding, hard surfacing, metal forming, steel distribution, and machinery repair. The company serves farming, construction, steel mill, mining, excavation, government, and other industrial customers and works with steel, aluminum, stainless steel, brass, bronze, and copper.
Founded in 1984, Oakley Industries Sub Assembly Division supplies sequenced tire and wheel assemblies to automotive original-equipment manufacturers. From seven plants in the United States and Canada, more than 300 employees produce over 9 million assemblies for 10 customer assembly plants, with facilities positioned near the automakers they serve. Oakley received FCA’s Outstanding Quality Performance Award from 2015 through 2019.
Oakmont Northern is a Cincinnati-based service company known for helping heat-treat facilities keep critical equipment running across North America. Its MTI-trained technicians, with PRI and ATP certifications, provide calibration support and practical repairs for production operations.
Founded in 1997 in the Cleveland area, Oakwood Labs develops and manufactures sustained-release injectable pharmaceuticals through its proprietary Chroniject™ polymer microsphere platform. Its integrated operation connects formulation research and development with an FDA-approved aseptic cGMP facility, supporting products from early feasibility through clinical supply and commercial manufacturing. Oakwood has worked on more than 100 long-acting injectable projects and currently manufactures five FDA-approved commercial products.
Born from a repair workshop in post-war Germany, Oase has made water technology since 1949, developing systems for ponds, aquariums, fountains and demanding water-treatment applications. Its German engineering combines practical water knowledge with considered design, serving settings from home gardens and aquariums to public spaces and lake-restoration projects. Oase products have also received industry awards for design, innovation and engineering.
Founded in a post-war German repair workshop, Oase has made and engineered water technology since 1949, beginning with agricultural pumps and expanding to systems for ponds, aquariums, fountains and water treatment. Its German-born engineering combines practical water knowledge with considered design, serving applications from home gardens to public spaces and lake restoration projects.
Founded in Columbus in 1910, OASIS International manufactures drinking fountains, bottle fillers, water coolers and filtration systems for clean-water access in public and private spaces. The company has introduced more than 13 million touchless bottle fillers and other hydration products, serving customers in more than 80 countries from seven manufacturing and distribution locations across the United States, Mexico, Ireland and Poland. Its school-focused equipment is designed for straightforward maintenance, including the proprietary Tilt ’N Tether filter-access system.
Founded in Cleveland in 1916, Oatey Co. manufactures plumbing products for residential and commercial jobs, from rough-in solutions to the solvent cements and sealants used to complete installations. Its Cleveland operation anchors a broader manufacturing and distribution network serving professional builders, contractors, engineers and do-it-yourself customers worldwide. The company also operates Oatey University, a 20,000-square-foot Cleveland training facility where tradespeople can practice installations and earn continuing-education credits.
Founded in 1944, Toledo’s Obars Machine & Tool makes precision-machined components, tooling and fixtures for customers ranging from one-off parts to production runs in the tens of thousands. Its unusual rework and repair department handles emergency machine-part and tooling repairs as well as ongoing rework programs, including service for walk-in customers. Obars operates under ISO 9001:2015 and AS9100D quality-management standards and serves aerospace among other industrial markets.
Oberfields LLC manufactures concrete hardscape and masonry products at facilities in Obetz and Sunbury, Ohio. Its hardscape products are made in Obetz, while its Best Block-branded concrete masonry products are produced in Sunbury. The company distributes through dealers and contractors across the Midwest and is a QUIKRETE Company.
Family-owned OBR Cooling Towers was founded in 1994 by Peter Poll and is now led by his son, Phil, carrying a relationship-based approach from its Midwest roots into a nationwide business. With more than 450 employees across 10-plus locations, OBR supports critical infrastructure by rebuilding and servicing cooling towers for customers such as hospitals, power facilities, and data centers. Its HEIGHTS program, which stands for “How Everyone Involved Gets Home Today Safe,” reflects the company’s distinctive emphasis on safety.
Built in 2026 in New Madison, Ohio, Obsidian Metal Processing runs a 125,000-square-foot facility centered on the Midwest’s newest slitting line for flat-rolled steel. Its KORE line includes a cluster leveler for shape correction and a 40-foot looping pit suited to narrow, light-gauge work. Located within 200 miles of eight steel mills, OMP also pairs steel processing with custom inventory programs and coil testing.
OC Composites, presented as the “Original Composites Company,” develops glass-fiber reinforcement products backed by more than 85 years of innovation. Its global composites operation spans 12 countries and supports customers through a team of product experts and regional offices around the world.
Founded in 1991 by ocean engineer Ed Harper, North Canton’s O.E. Enterprises makes American-made underwater speakers and sound systems for diver communication, safety, synchronized swimming and aquatic research. Its equipment has supplied synchronized-swimming sound at the Atlanta, Beijing and Rio Olympic Games, while its U.S. Navy-approved diver signaling devices serve military and security applications. The small company also builds custom systems, including portable units for teams and pool installations.
OCS IntelliTrak began in 1994 through a North American partnership with OCS AB Sweden and is now headquartered in Fairfield, where it carries out its work from engineering through manufacturing and installation. The company is known for custom material-handling systems built around a chainless rotating-tube drive, serving manufacturers that need adaptable conveyor infrastructure for changing production demands.
OCSiAl produces TUBALL™ single-wall carbon nanotubes and nanotube-based additives that give batteries, polymers and coatings durable conductivity and reinforcement. Its large-scale production technology has made commercial use of graphene nanotubes possible, with products manufactured in tens of metric tons annually and R&D centers in Luxembourg, Serbia and China. The company says it is the world’s largest producer of graphene nanotubes and has more than 500 employees across 20 countries.
Founded by electrochemical molecular-design expert Onas Bolton, Octet Scientific develops and scales improved electrolytes for aqueous and alternative-chemistry batteries. The Cleveland company pairs a catalog of more than 400 molecules with rapid testing, then uses manufacturing partners across the U.S., Europe and India to move promising formulations from laboratory trials into commercial supply. Its reported customer results include higher capacity and efficiency along with twice the operating life.
OcuDoc Inc develops smartphone-based eye-care technology that remotely monitors myopia by using a proprietary algorithm to analyze retinal light scatter and estimate changes in axial length. Its app sends measurements from patients’ homes to their designated eye-care professionals, offering a mobile alternative to specialized equipment costing more than $25,000. The company’s technology team includes biomedical engineering and regulated-device experience, while its board includes LensCrafters founder E. Dean Butler.
Founded in 1971 as Ott-A-Matic, Odawara Automation designs and builds automated winding and assembly equipment for electric-motor manufacturers. From its Tipp City operation, the North American arm of Japan’s Odawara Engineering develops tailored machines and complete production systems rather than catalog equipment, working with customers from design-for-manufacturing through installation and long-term service. The company says it has more than five decades of experience and has delivered over 3,000 machines and systems.