# 100 leading companies with in-house R&D in Ohio

Tamtam tracks 277 companies with in-house R&D headquartered in Ohio. This list ranks the 100 largest by number of employees on LinkedIn, led by Procter & Gamble, Parker Hannifin and Sherwin-Williams. Their median headcount is 1,970. Half of them were founded in 1930 or later. The most common headquarters are Cleveland (13), Cincinnati (9) and Columbus (8).

This list features large companies in Ohio with in-house R&D departments. The prominent sectors are manufacturing, particularly industrial machinery, paint, and motor vehicles, alongside a strong presence of healthcare and higher education institutions. Notable companies include Procter & Gamble, which designs and sells consumer goods, Parker Hannifin, a global leader in motion and control technologies, and Sherwin-Williams, a global supplier of paints and coatings. Cleveland Clinic is a not-for-profit academic medical center, and GE Aerospace provides jet and turboprop engines.

A clear pattern among these companies is their long-standing presence, with many founded in the late 19th or early 20th centuries, such as The Goodyear Tire & Rubber Company (1898) and Dana Incorporated (1904). There is also a concentration of headquarters in major cities like Cincinnati, Cleveland, and Columbus, indicating these urban centers as key hubs for research and development activities in Ohio.

🇺🇸 Ohio · 100 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Procter & Gamble](https://www.tamtam.ai/c/procter-and-gamble) (pg.com)<br>Designs, develops, and sells a wide range of iconic consumer goods brands worldwide, improving daily life for billions of consumers through innovative products. | Manufacturing | 🇺🇸 Cincinnati | 92,610 |  |
| 2 | [Parker Hannifin](https://www.tamtam.ai/c/parker-hannifin) (parker.com)<br>Global leader in motion and control technologies, enabling engineering breakthroughs for a better tomorrow Diversified company providing vital products for various industries worldwide | Industrial Machinery Manufacturing | 🇺🇸 Cleveland | 56,000 | 1917 |
| 3 | [Sherwin-Williams](https://www.tamtam.ai/c/sherwin-williams) (sherwin-williams.com)<br>Global supplier of paints, coatings, and related products with extensive distribution network and diverse, innovative workforce worldwide. | Paint, Coating, and Adhesive Manufacturing | 🇺🇸 Cleveland | 49,925 |  |
| 4 | [Cleveland Clinic](https://www.tamtam.ai/c/cleveland-clinic) (my.clevelandclinic.org)<br>A not-for-profit academic medical center in Ohio, offering clinical care, research, and education with multiple facilities worldwide | Hospitals and Health Care | 🇺🇸 Cleveland | 49,624 |  |
| 5 | [GE Aerospace](https://www.tamtam.ai/c/ge-aerospace) (geaerospace.com)<br>A global provider of jet and turboprop engines, components, and systems for various types of aircraft, enhancing the world through flight | Aviation and Aerospace Component Manufacturing | 🇺🇸 Cincinnati | 37,191 |  |
| 6 | [The Ohio State University](https://www.tamtam.ai/c/the-ohio-state-university) (osu.edu)<br>Large public university offering extensive research opportunities and multiple regional campuses, serving as a model for Ohio's higher education system. | Higher Education | 🇺🇸 Columbus | 30,775 | 1870 |
| 7 | [The Goodyear Tire & Rubber Company](https://www.tamtam.ai/c/the-goodyear-tire-and-rubber-company) (goodyear.com)<br>Global tire manufacturer with 57 facilities in 23 countries, employing 72,000 people Leading innovation through state-of-the-art products and services | Motor Vehicle Manufacturing | 🇺🇸 Akron | 30,571 | 1898 |
| 8 | [Avery Dennison](https://www.tamtam.ai/c/avery-dennison) (averydennison.com)<br>A global materials science company providing digital identification solutions for various industries, optimizing efficiency, sustainability, and customer experience worldwide | Packaging and Containers Manufacturing | 🇺🇸 Mentor | 22,063 | 1935 |
| 9 | [University Hospitals](https://www.tamtam.ai/c/university-hospitals) (uhhospitals.org)<br>Integrated healthcare provider in northern Ohio, offering hospital services, outpatient facilities, physician offices, and leading research programs. | Hospitals and Health Care | 🇺🇸 Cleveland | 20,700 | 1866 |
| 10 | [Diebold Nixdorf](https://www.tamtam.ai/c/diebold-nixdorf) (dieboldnixdorf.com)<br>This company specializes in automating and digitizing banking and shopping experiences, offering cutting-edge technology solutions for financial and retail customers worldwide | IT Services and IT Consulting | 🇺🇸 North Canton | 20,523 | 1859 |
| 11 | [Vertiv](https://www.tamtam.ai/c/vertiv) (vertiv.com)<br>Vertiv provides integrated hardware, software, and services for data centers, communication networks, and industrial facilities worldwide, ensuring continuous and optimal performance | Appliances, Electrical, and Electronics Manufacturing | 🇺🇸 Columbus | 18,315 | 2016 |
| 12 | [University of Cincinnati](https://www.tamtam.ai/c/university-of-cincinnati) (uc.edu)<br>Public research university combining academic excellence with cooperative education, producing impactful discoveries and significant regional economic contributions. | Higher Education | 🇺🇸 Cincinnati | 16,727 | 1819 |
| 13 | [Dana Incorporated](https://www.tamtam.ai/c/dana-incorporated) (dana.com)<br>Develops and advances drive and motion systems, thermal and sealing technologies, and power management for traditional, hybrid, and electric vehicles worldwide. | Motor Vehicle Manufacturing | 🇺🇸 Maumee | 16,617 | 1904 |
| 14 | [The Ohio State University Wexner Medical Center](https://www.tamtam.ai/c/the-ohio-state-university-wexner-medical-center) (wexnermedical.osu.edu)<br>Academic medical center providing personalized patient care, medical education, research innovation, and extensive healthcare services across multiple specialties. | Hospitals and Health Care | 🇺🇸 Columbus | 15,993 | 1834 |
| 15 | [Nationwide Children's Hospital](https://www.tamtam.ai/c/nationwide-children-s-hospital) (nationwidechildrens.org)<br>Provides advanced pediatric medical care, conducts leading research, trains specialists, and offers specialized programs in heart, cancer, and neonatology. | Hospitals and Health Care | 🇺🇸 Columbus | 12,575 | 1892 |
| 16 | [O-I](https://www.tamtam.ai/c/o-i) (o-i.com)<br>Global producer of sustainable glass bottles and jars, partnering with top food and beverage brands to create innovative packaging solutions. | Glass, Ceramics and Concrete Manufacturing | 🇺🇸 Perrysburg | 11,873 |  |
| 17 | [Owens Corning](https://www.tamtam.ai/c/owens-corning) (owenscorning.com)<br>Global leader in durable, sustainable building products focused on energy efficiency and material innovation to support customer growth. | Wholesale Building Materials | 🇺🇸 Toledo | 11,279 | 1938 |
| 18 | [STERIS](https://www.tamtam.ai/c/steris) (steris.com)<br>Provides infection prevention, procedural products, and services for healthcare, pharmaceutical, and medical device customers globally, aiming for a healthier, safer world. | Medical Equipment Manufacturing | 🇺🇸 Mentor | 11,156 | 1985 |
| 19 | [Bendix Commercial Vehicle Systems LLC](https://www.tamtam.ai/c/bendix-commercial-vehicle-systems-llc) (bendix.com)<br>Development and supply of active safety technologies, energy management, and air brake systems for medium and heavy commercial vehicles. | Truck Transportation | 🇺🇸 Avon | 9,354 | 1930 |
| 20 | [Kent State University](https://www.tamtam.ai/c/kent-state-university) (kent.edu)<br>A top-tier research university offering diverse academic programs, award-winning student support services, and global opportunities for students and alumni | Higher Education | 🇺🇸 Kent | 8,986 | 1910 |
| 21 | [Crown Equipment Corporation](https://www.tamtam.ai/c/crown-equipment-corporation) (crown.com)<br>A global leader in material handling, offering innovative forklifts, automation, and fleet management technologies to improve performance and reduce operating costs | Truck Transportation | 🇺🇸 New Bremen | 8,469 | 1945 |
| 22 | [The Timken Company](https://www.tamtam.ai/c/the-timken-company) (timken.com)<br>Designs and manufactures engineered bearings and industrial motion products, providing innovative, reliable solutions for diverse global industries. | Industrial Machinery Manufacturing | 🇺🇸 North Canton | 8,288 |  |
| 23 | [Parker Aerospace](https://www.tamtam.ai/c/parker-aerospace) (parker.com)<br>Global leader in research, design, manufacture, and service of aerospace systems and components for various markets worldwide Specializes in flight control, hydraulic, and thermal management technologies | Aviation and Aerospace Component Manufacturing | 🇺🇸 Cleveland | 8,030 | 1917 |
| 24 | [The Lubrizol Corporation](https://www.tamtam.ai/c/the-lubrizol-corporation) (lubrizol.com)<br>A global corporation focused on sustainable solutions through advanced science, impacting billions of lives worldwide with products for cleaner, smarter living | Chemical Manufacturing | 🇺🇸 Wickliffe | 7,113 | 1928 |
| 25 | [Medpace](https://www.tamtam.ai/c/medpace) (medpace.com)<br>Global CRO accelerating drug, biologic, and medical device clinical development through high-science expertise in various therapeutic areas worldwide | Pharmaceutical Manufacturing | 🇺🇸 Cincinnati | 6,421 | 1992 |
| 26 | [UC Health](https://www.tamtam.ai/c/uc-health) (uchealth.com)<br>Top clinicians and researchers providing world-class, compassionate healthcare through advanced clinical services, teaching, innovation, and research in Cincinnati. | Hospitals and Health Care | 🇺🇸 Cincinnati | 6,134 |  |
| 27 | [Battelle](https://www.tamtam.ai/c/battelle) (battelle.org)<br>A science and technology company solving critical issues through research, development, manufacturing, and services for government and commercial clients worldwide | Research Services | 🇺🇸 Columbus | 6,013 | 1929 |
| 28 | [Lincoln Electric](https://www.tamtam.ai/c/lincoln-electric) (lincolnelectric.com)<br>Global leader in arc welding, robotic welding systems, plasma and oxyfuel cutting equipment, brazing and soldering alloys manufacturing and support. | Machinery Manufacturing | 🇺🇸 Cleveland | 5,764 | 1895 |
| 29 | [Bowling Green State University](https://www.tamtam.ai/c/bowling-green-state-university) (bgsu.edu)<br>A public university with over a century of history, offering high-research, nationally ranked education with a focus on serving the public good | Higher Education | 🇺🇸 Bowling Green | 5,712 | 1910 |
| 30 | [Akron Children's](https://www.tamtam.ai/c/akron-children-s) (akronchildrens.org)<br>Largest pediatric healthcare system in Northern Ohio providing compassionate, high-quality care through hospitals, regional centers, and specialty locations. | Hospitals and Health Care | 🇺🇸 Akron | 5,264 | 1890 |
| 31 | [CAS](https://www.tamtam.ai/c/cas) (cas.org)<br>A global leader in scientific information solutions, connecting professionals to curated data to accelerate breakthroughs and advancements in science | IT Services and IT Consulting | 🇺🇸 Columbus | 4,593 | 1907 |
| 32 | [Hyster-Yale Materials Handling](https://www.tamtam.ai/c/hyster-yale-materials-handling) (hyster-yale.com)<br>Design, manufacture, and service of lift trucks, attachments, and power solutions under multiple brand names worldwide. | Machinery Manufacturing | 🇺🇸 Cleveland | 4,535 |  |
| 33 | [ProAmpac](https://www.tamtam.ai/c/proampac) (proampac.com)<br>A global leader in flexible packaging, providing creative solutions, sustainable products, and innovative collaboration to meet customer needs and sustainability goals | Packaging and Containers Manufacturing | 🇺🇸 Cincinnati | 4,519 |  |
| 34 | [Hyland](https://www.tamtam.ai/c/hyland) (hyland.com)<br>The company helps Fortune 100 companies by creating technology foundations that enable intelligent connections of content, data, and processes | Software Development | 🇺🇸 Westlake | 4,322 |  |
| 35 | [Avient Corporation](https://www.tamtam.ai/c/avient-corporation) (avient.com)<br>Development and supply of colorants, composites, additives, engineered materials, and Dyneema® fibers for sustainable, high-performance customer products. | Plastics Manufacturing | 🇺🇸 Avon Lake | 4,204 |  |
| 36 | [The Scotts Miracle-Gro Company](https://www.tamtam.ai/c/the-scotts-miracle-gro-company) (scottsmiraclegro.com)<br>The company develops leading lawn and gardening products, prioritizes community responsibility, and fosters a culture of growth, innovation, and giving back | Consumer Goods | 🇺🇸 Marysville | 4,102 | 1868 |
| 37 | [Swagelok](https://www.tamtam.ai/c/swagelok) (swagelok.com)<br>A global provider of high-quality fluid system products and services, supporting diverse industries with tailored expertise and a commitment to success | Industrial Machinery Manufacturing | 🇺🇸 Solon | 3,402 | 1947 |
| 38 | [The Davey Tree Expert Company](https://www.tamtam.ai/c/the-davey-tree-expert-company) (davey.com)<br>The organization provides research-driven tree services, grounds maintenance, and environmental solutions for various partners, focusing on sustainability and exceeding client expectations | Environmental Services | 🇺🇸 Kent | 3,268 | 1880 |
| 39 | [Crown Lift Trucks](https://www.tamtam.ai/c/crown-lift-trucks) (crown.com)<br>A material handling partner offering sales, services, and rentals of forklifts and warehouse products, with a focus on productivity and customer satisfaction | Transportation, Logistics, Supply Chain and Storage | 🇺🇸 New Bremen | 3,139 | 1945 |
| 40 | [Air Force Research Laboratory](https://www.tamtam.ai/c/air-force-research-laboratory) (afresearchlab.com)<br>Leading discovery, development, delivery of warfighting technologies for air, space, cyberspace forces, providing unmatched advantage through research, technology, and strategic partnerships. | Armed Forces | 🇺🇸 Wright-Patterson AFB | 3,085 | 1997 |
| 41 | [Babcock & Wilcox](https://www.tamtam.ai/c/babcock-and-wilcox) (babcock.com)<br>A global leader in energy and environmental technologies and services for power, renewable, and industrial markets, with a history of over 150 years | Renewable Energy Power Generation | 🇺🇸 Akron | 2,627 | 1867 |
| 42 | [Nordson Corporation](https://www.tamtam.ai/c/nordson-corporation) (nordson.com)<br>Engineering and manufacturing precision dispensing and processing products serving packaging, transportation, medical, and electronics markets worldwide. | Machinery Manufacturing | 🇺🇸 Westlake | 2,614 | 1954 |
| 43 | [MTD Products](https://www.tamtam.ai/c/mtd-products) (genuinefactoryparts.com)<br>Design and manufacture a wide range of outdoor power equipment including mowers, snow throwers, and utility vehicles for various customers. | Manufacturing | 🇺🇸 Valley City | 2,522 | 1932 |
| 44 | [Avery Dennison Label and Packaging Materials](https://www.tamtam.ai/c/avery-dennison-label-and-packaging-materials) (label.averydennison.com)<br>Global material science and digital identification solutions company, providing branding and information solutions optimizing efficiency, sustainability, and transparency, connecting brands and consumers. | Manufacturing | 🇺🇸 Mentor | 2,493 | 1935 |
| 45 | [Sotera Health Company](https://www.tamtam.ai/c/sotera-health-company) (soterahealth.com)<br>A global health company leveraging over 500 years of combined expertise in scientific safety across medical, pharma, tissue, and food industries | Hospitals and Health Care | 🇺🇸 Broadview Heights | 2,370 |  |
| 46 | [Advanced Drainage Systems, Inc.](https://www.tamtam.ai/c/advanced-drainage-systems-inc) (adspipe.com)<br>Leading manufacturer of thermoplastic corrugated pipes and water management products serving residential, agriculture, infrastructure, and commercial drainage markets globally. | Construction | 🇺🇸 Hilliard | 2,361 | 1966 |
| 47 | [Honda R&D Americas, LLC](https://www.tamtam.ai/c/honda-r-and-d-americas-llc) (hondaresearch.com)<br>Innovation-driven team at Honda R&D Americas brings dreams to life with development, design, and production of vehicles and technologies | Motor Vehicle Manufacturing | 🇺🇸 Raymond | 2,166 |  |
| 48 | [The Hillman Group](https://www.tamtam.ai/c/the-hillman-group) (hillmangroup.com)<br>Leading provider of hardware, fasteners, project supplies, and key and engraving services, serving retail, pro distribution, and industrial MRO customers. | Manufacturing | 🇺🇸 Cincinnati | 2,179 | 1964 |
| 49 | [Kroger Technology & Digital](https://www.tamtam.ai/c/kroger-technology-and-digital) (thekrogerco.com)<br>A retail food company dedicated to feeding the human spirit through a seamless digital shopping experience and creating #ZeroHungerZeroWaste communities by 2025 | Retail | 🇺🇸 Cincinnati | 1,990 | 1883 |
| 50 | [Ohio State University Comprehensive Cancer Center-James Cancer Hospital & Solove Research Institute](https://www.tamtam.ai/c/ohio-state-university-comprehensive-cancer-center-james-cancer-hospital-and) (cancer.osu.edu)<br>Leading cancer research center and hospital focused on integrating research, education, and patient care to advance prevention, detection, and treatment Ranked among top in the nation | Hospitals and Health Care | 🇺🇸 Columbus | 1,970 |  |
| 51 | [Saint-Gobain Performance Plastics](https://www.tamtam.ai/c/saint-gobain-performance-plastics) (saint-gobain.com)<br>Leading producer of engineered high-performance polymer products serving diverse industries worldwide with innovation, expertise, and comprehensive customer support. | Plastics Manufacturing | 🇺🇸 Solon | 1,932 |  |
| 52 | [Hexion Inc.](https://www.tamtam.ai/c/hexion-inc) (hexion.com)<br>Leading global producer of adhesives and performance materials serving construction, furniture, energy, and automotive industries with technical support. | Chemical Manufacturing | 🇺🇸 Columbus | 1,790 |  |
| 53 | [NASA Glenn Research Center](https://www.tamtam.ai/c/nasa-glenn-research-center) (nasa.gov)<br>The company is a NASA center near Cleveland with world-class facilities for aerospace research and testing, essential to the agency and regional economy | Aviation and Aerospace Component Manufacturing | 🇺🇸 Cleveland | 1,775 | 1941 |
| 54 | [Materion Corporation](https://www.tamtam.ai/c/materion-corporation) (materion.com)<br>Global provider of high-tech solutions in electronic materials, performance materials, and precision optics, driving scientific breakthroughs and technological advancements worldwide with over 100 years of experience | Manufacturing | 🇺🇸 Mayfield Heights | 1,751 | 1931 |
| 55 | [MPW Industrial Services](https://www.tamtam.ai/c/mpw-industrial-services) (mpwservices.com)<br>A leading provider of industrial cleaning, water purification, facility management, and waste services in North America, enhancing efficiency, reliability, and cost-effectiveness for various industries | Facilities Services | 🇺🇸 Hebron | 1,679 |  |
| 56 | [BWI GROUP](https://www.tamtam.ai/c/bwi-group) (bwigroup.com)<br>Global automotive Tier-1 supplier providing safe, comfortable, smart, and sustainable Brake and Suspension System products worldwide, focusing on innovation and growth | Motor Vehicle Manufacturing | 🇺🇸 Dayton | 1,663 |  |
| 57 | [Case Western Reserve University School of Medicine](https://www.tamtam.ai/c/case-western-reserve-university-school-of-medicine) (case.edu)<br>Leading medical school with innovative education, groundbreaking research, creating physicians, scientists, and healthcare professionals, and advancing community healthcare globally and locally | Higher Education | 🇺🇸 Cleveland | 1,540 | 1843 |
| 58 | [Laird Connectivity](https://www.tamtam.ai/c/laird-connectivity) (ezurio.com)<br>A company that simplifies wireless connectivity through high-quality RF modules, System-On-Modules, antennas, IoT devices, and custom solutions with reliable support | Computers and Electronics Manufacturing | 🇺🇸 Akron | 1,517 |  |
| 59 | [Ferro Corporation](https://www.tamtam.ai/c/ferro-corporation) (vibrantz.com)<br>Leading global provider of color solutions, functional coatings, and specialty minerals enhancing performance and vibrancy across diverse industries. | Chemical Manufacturing | 🇺🇸 Mayfield Heights | 1,429 | 1919 |
| 60 | [Midmark Corporation](https://www.tamtam.ai/c/midmark-corporation) (midmark.com)<br>Designs and manufactures products and solutions that integrate space, technology, and clinical workflow for seamless medical, dental, and veterinary care experiences. | Medical Equipment Manufacturing | 🇺🇸 Versailles | 1,388 | 1915 |
| 61 | [AtriCure, Inc.](https://www.tamtam.ai/c/atricure-inc) (atricure.com)<br>Provides innovative medical devices and therapies for treating Afib, reducing related complications, and managing post-operative pain for cardiothoracic and thoracic procedures. | Medical Equipment Manufacturing | 🇺🇸 Mason | 1,383 | 2000 |
| 62 | [OCLC](https://www.tamtam.ai/c/oclc) (oclc.org)<br>The company empowers libraries with technology solutions, research, and community programs to help them adapt to changing needs | Technology, Information and Internet | 🇺🇸 Dublin | 1,379 | 1967 |
| 63 | [TS Tech Americas, Inc.](https://www.tamtam.ai/c/ts-tech-americas-inc) (tstech.com)<br>A global company manufacturing seats and interior components for automotive and power sport OEMs with a focus on environmental sustainability and community support | Motor Vehicle Manufacturing | 🇺🇸 Reynoldsburg | 1,366 | 1995 |
| 64 | [GOJO, Makers of PURELL](https://www.tamtam.ai/c/gojo-makers-of-purell) (gojo.com)<br>Development and manufacturing of innovative hygiene products promoting healthier skin and environments, driven by science and collaborative culture. | Manufacturing | 🇺🇸 Akron | 1,337 |  |
| 65 | [Makino](https://www.tamtam.ai/c/makino) (makino.com)<br>A global leader in metal-cutting technology, offering machining centers, EDM machines, software, engineering services, automation systems, training, and financing to help customers increase productivity and reduce costs | Machinery Manufacturing | 🇺🇸 Mason | 1,313 |  |
| 66 | [Invacare U.S.](https://www.tamtam.ai/c/invacare-u-s) (invacareamerica.com)<br>Global leader in home and long-term care medical products, empowering individuals with disabilities to live independent, active lifestyles worldwide | Medical Equipment Manufacturing | 🇺🇸 Elyria | 1,303 | 1885 |
| 67 | [Resilience](https://www.tamtam.ai/c/resilience-blue-ash) (resilience.com)<br>Focused on providing high-quality, scalable manufacturing solutions for advanced therapies, partnering with biopharma companies to bring complex medicines to market. | Pharmaceutical Manufacturing | 🇺🇸 Blue Ash | 1,301 | 2020 |
| 68 | [Tremco Roofing and Building Maintenance](https://www.tamtam.ai/c/tremco-roofing-and-building-maintenance) (tremcoroofing.com)<br>A leading innovator in roofing and weatherproofing solutions since 1928, providing comprehensive services including maintenance, restoration, and repair with a focus on quality and innovation | Wholesale Building Materials | 🇺🇸 Beachwood | 1,295 | 1928 |
| 69 | [Aleris](https://www.tamtam.ai/c/aleris) (aleris.com)<br>A global leader in aluminum rolled products serving major customers in aerospace, building, containers, transportation industries with advanced manufacturing capabilities | Mining | 🇺🇸 Cleveland | 1,235 |  |
| 70 | [LION](https://www.tamtam.ai/c/lion-dayton) (lionprotects.com)<br>The company specializes in providing innovative personal protective equipment, fire training tools, and maintenance programs for first responders worldwide | Public Safety | 🇺🇸 Dayton | 1,222 | 1898 |
| 71 | [University of Cincinnati College of Medicine](https://www.tamtam.ai/c/university-of-cincinnati-college-of-medicine) (jobs.uc.edu)<br>The company provides medical education programs, conducts research, and offers clinical care through its faculty practice group | Higher Education | 🇺🇸 Cincinnati | 1,197 | 1819 |
| 72 | [Bimbo QSR](https://www.tamtam.ai/c/bimbo-qsr) (bimboqsr.com)<br>Industry leader in high-speed, customized baking, supplying top-quality sandwich buns and rolls globally, with a commitment to excellence and innovation | Food and Beverage Manufacturing | 🇺🇸 Zanesville | 1,191 | 1955 |
| 73 | [Federal Reserve Bank of Cleveland](https://www.tamtam.ai/c/federal-reserve-bank-of-cleveland) (clevelandfed.org)<br>Formulates monetary policy, supervises banks, provides payment services, and supports economic stability in the Fourth Federal Reserve District. | Banking | 🇺🇸 Cleveland | 1,176 | 1914 |
| 74 | [Northeast Ohio Medical University (NEOMED)](https://www.tamtam.ai/c/northeast-ohio-medical-university-neomed) (neomed.edu)<br>Specializing in interprofessional training, the company prepares future healthcare leaders, educates aspiring physicians, and shares the NEOMED journey through various initiatives | Higher Education | 🇺🇸 Rootstown | 1,117 | 1973 |
| 75 | [Austin Powder](https://www.tamtam.ai/c/austin-powder) (austinpowder.com)<br>The company manufactures industrial explosives, accessories, and offers technical blasting services globally | Mining | 🇺🇸 Cleveland | 1,090 | 1833 |
| 76 | [Kroger Technology](https://www.tamtam.ai/c/kroger-technology) (kroger.com)<br>Innovative technology solutions improving everyday lives through online grocery shopping, mobile apps, personalization technology, and Agile methodologies for customer satisfaction | IT Services and IT Consulting | 🇺🇸 Blue Ash | 997 | 1883 |
| 77 | [Ultium Cells LLC](https://www.tamtam.ai/c/ultium-cells-llc) (ultiumcell.com)<br>A company specializing in designing and manufacturing advanced battery cells for electric transportation, seeking diverse talent to drive innovation in the industry | Manufacturing | 🇺🇸 Warren | 951 |  |
| 78 | [Lake Health](https://www.tamtam.ai/c/lake-health) (uhhospitals.org)<br>Healthcare provider in Northeast Ohio now part of a larger health system with numerous hospitals, health centers, and physician offices | Hospitals and Health Care | 🇺🇸 Concord Twp. | 927 | 1902 |
| 79 | [DuBois Chemicals, Inc.](https://www.tamtam.ai/c/dubois-chemicals-inc) (duboischemicals.com)<br>A provider of specialty cleaning and process solutions for various industries worldwide, known for innovative and sustainable practices with a large team across North America | Chemical Manufacturing | 🇺🇸 Sharonville | 923 | 1920 |
| 80 | [Nifco America Corp.](https://www.tamtam.ai/c/nifco-america-corp) (nifcousa.com)<br>A global supplier of custom injection molded plastic components for various industries such as automotive, electronics, and home appliances | Motor Vehicle Manufacturing | 🇺🇸 Canal Winchester | 916 | 1987 |
| 81 | [Hyperion Materials & Technologies](https://www.tamtam.ai/c/hyperion-materials-and-technologies) (hyperionmt.com)<br>Global provider of engineered hard and super-hard materials for demanding applications across aerospace, automotive, electronics, energy, medical, and manufacturing industries. | Industrial Machinery Manufacturing | 🇺🇸 Worthington | 899 | 2018 |
| 82 | [Fuyao Glass Corporation of America](https://www.tamtam.ai/c/fuyao-glass-corporation-of-america) (fuyaousa.com)<br>Global provider of safety glass and automotive trim solutions for various transportation vehicles, offering design, production, and sales services worldwide | Glass Product Manufacturing | 🇺🇸 Moraine | 889 | 2014 |
| 83 | [Ariel Corporation](https://www.tamtam.ai/c/ariel-corporation) (arielcorp.com)<br>Manufacturing reciprocating gas compressors for extracting, processing, transporting, storing, and distributing industrial gases in energy sectors worldwide. | Oil and Gas | 🇺🇸 Mount Vernon | 859 | 1966 |
| 84 | [University of Dayton Research Institute](https://www.tamtam.ai/c/university-of-dayton-research-institute) (udayton.edu)<br>A national leader in scientific and engineering research providing innovative solutions in materials, energy, aeropropulsion, and more with integrity and commitment | Research Services | 🇺🇸 Dayton | 855 | 1956 |
| 85 | [Yaskawa Motoman](https://www.tamtam.ai/c/yaskawa-motoman) (motoman.com)<br>A leading robotics company providing automation products and solutions for various industries, with a wide range of robot models and specialized solutions worldwide | Automation Machinery Manufacturing | 🇺🇸 Miamisburg | 855 | 1989 |
| 86 | [Vitamix](https://www.tamtam.ai/c/vitamix) (vitamix.com)<br>Designing and manufacturing high-quality, reliable blending equipment focused on promoting health, wellbeing, and superior customer experience. | Manufacturing | 🇺🇸 Olmsted Falls | 819 | 1921 |
| 87 | [Meridian Bioscience Inc.](https://www.tamtam.ai/c/meridian-bioscience-inc) (meridianbioscience.com)<br>Develops, manufactures, markets, and distributes innovative diagnostic test kits, rare reagents, specialty biologicals, and components for early diagnosis and treatment of medical conditions globally. | Medical Equipment Manufacturing | 🇺🇸 Cincinnati | 815 | 1977 |
| 88 | [Smithers](https://www.tamtam.ai/c/smithers) (smithers.com)<br>A multinational provider of testing, consulting, and certification services across various industries, delivering accurate data and innovative solutions through science and expertise | Research Services | 🇺🇸 Akron | 802 |  |
| 89 | [Tremco CPG Inc.](https://www.tamtam.ai/c/tremco-cpg-inc) (tremcocpg.com)<br>Manufacturer of roofing materials, sealants, waterproofing systems, concrete admixtures, fire stopping systems, and custom construction maintenance products worldwide. | Construction | 🇺🇸 Beachwood | 795 | 1928 |
| 90 | [PTI](https://www.tamtam.ai/c/pti) (plastictechnologies.com)<br>Global leader in plastics packaging with expertise in preform and package design, rapid prototyping, material evaluation engineering, and package development for the industry | Packaging and Containers Manufacturing | 🇺🇸 Holland | 782 | 1985 |
| 91 | [Special Metals](https://www.tamtam.ai/c/special-metals) (precast.com)<br>A global leader in high-performance alloy manufacturing, offering solutions to materials challenges through a range of nickel and cobalt alloys worldwide | Mining | 🇺🇸 Warrensville Heights | 780 |  |
| 92 | [Airborne Maintenance and Engineering Services](https://www.tamtam.ai/c/airborne-maintenance-and-engineering-services) (airbornemx.com)<br>A leading MRO service provider offering maintenance services to cargo and passenger airlines with multiple locations and extensive capabilities | Airlines and Aviation | 🇺🇸 Wilmington | 760 | 2009 |
| 93 | [OM Group](https://www.tamtam.ai/c/om-group) (omgi.com)<br>Development of innovative materials, systems, and technologies for mobile energy storage, electronics, renewable energy, and automotive applications worldwide. | Chemical Manufacturing | 🇺🇸 Cleveland | 746 | 1993 |
| 94 | [Barrette Outdoor Living](https://www.tamtam.ai/c/barrette-outdoor-living) (barretteoutdoorliving.com)<br>Manufacturing fencing, railing, decking, and outdoor products with patented technology, focusing on durability, sustainability, and easy installation. | Manufacturing | 🇺🇸 Middleburg Heights | 746 | 1978 |
| 95 | [Henny Penny](https://www.tamtam.ai/c/henny-penny) (hennypenny.com)<br>A leading innovator in foodservice equipment, offering high-quality fryers, ovens, and merchandisers with a focus on customer experience and operational efficiency | Food and Beverage Services | 🇺🇸 Eaton | 731 | 1957 |
| 96 | [RPM International Inc.](https://www.tamtam.ai/c/rpm-international-inc) (rpminc.com)<br>Multinational company specializing in specialty coatings, sealants, building materials, and related services with a diverse portfolio of leading brands worldwide | Chemical Manufacturing | 🇺🇸 Medina | 729 | 1947 |
| 97 | [Air Force Materiel Command](https://www.tamtam.ai/c/air-force-materiel-command) (afmc.af.mil)<br>Develops, acquires, and sustains aerospace power for defense through research, acquisition, management, logistics, testing, evaluation, and support services | Armed Forces | 🇺🇸 Dayton | 717 | 1992 |
| 98 | [Wright-Patterson Air Force Base](https://www.tamtam.ai/c/wright-patterson-air-force-base) (wpafb.af.mil)<br>A leading military aviation base in Ohio with a rich aviation history, supporting over 100 units, with extensive logistics, research, and development functions | Armed Forces | 🇺🇸 Wright-Patterson AFB | 717 | 1905 |
| 99 | [Applied Research Solutions](https://www.tamtam.ai/c/applied-research-solutions) (appliedres.com)<br>A growing company providing cyber, IT, intelligence, logistics, research, education, program management, engineering, scientific analysis, and space systems support to DoD and Intelligence Community | Defense and Space Manufacturing | 🇺🇸 Beavercreek | 695 | 2012 |
| 100 | [U.S. Air Force Institute of Technology](https://www.tamtam.ai/c/u-s-air-force-institute-of-technology) (afit.edu)<br>A leading institution for defense-focused graduate education and research, specializing in aerospace, space, and cyber forces technology, located at Wright-Patterson AFB | Armed Forces | 🇺🇸 Wright-Patterson AFB | 694 | 1919 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 11, 2026.

## More company lists in Ohio

- [The largest companies in Ohio](https://www.tamtam.ai/l/largest-companies-ohio) (2,910)
- [Manufacturers in Ohio](https://www.tamtam.ai/l/manufacturers-ohio) (479)
- [Multinational companies in Ohio](https://www.tamtam.ai/l/multinational-companies-ohio) (390)
- [Hardware manufacturers in Ohio](https://www.tamtam.ai/l/hardware-companies-ohio) (233)
- [Retail chains in Ohio](https://www.tamtam.ai/l/retail-chains-ohio) (230)
- [Education providers in Ohio](https://www.tamtam.ai/l/education-companies-ohio) (223)
- [Professional services firms in Ohio](https://www.tamtam.ai/l/professional-services-firms-ohio) (195)
- [Hospitals and Health Care companies in Ohio](https://www.tamtam.ai/l/hospitals-and-health-care-companies-ohio) (182)
- [Healthcare providers in Ohio](https://www.tamtam.ai/l/healthcare-providers-ohio) (181)
- [Financial services firms in Ohio](https://www.tamtam.ai/l/financial-services-firms-ohio) (162)
- [Critical infrastructure operators in Ohio](https://www.tamtam.ai/l/critical-infrastructure-operators-ohio) (153)
- [Family-owned companies in Ohio](https://www.tamtam.ai/l/family-owned-companies-ohio) (146)
- [IT Services and IT Consulting companies in Ohio](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-ohio) (133)
- [Public sector organisations in Ohio](https://www.tamtam.ai/l/public-sector-organisations-ohio) (133)
- [Contract manufacturers in Ohio](https://www.tamtam.ai/l/contract-manufacturers-ohio) (122)
- [Chemical companies in Ohio](https://www.tamtam.ai/l/chemical-companies-ohio) (120)
- [IT services companies in Ohio](https://www.tamtam.ai/l/it-services-companies-ohio) (118)
- [Consulting firms in Ohio](https://www.tamtam.ai/l/consulting-firms-ohio) (115)
- [Companies with a mobile app in Ohio](https://www.tamtam.ai/l/companies-with-mobile-app-ohio) (114)
- [Higher Education companies in Ohio](https://www.tamtam.ai/l/higher-education-companies-ohio) (110)
- [Construction companies in Ohio](https://www.tamtam.ai/l/construction-companies-ohio) (109)
- [Machinery Manufacturing companies in Ohio](https://www.tamtam.ai/l/machinery-manufacturing-companies-ohio) (108)
- [Distributors and wholesalers in Ohio](https://www.tamtam.ai/l/distributors-and-wholesalers-ohio) (105)
- [Corporate groups and holding companies in Ohio](https://www.tamtam.ai/l/holding-companies-ohio) (104)

## The same list elsewhere in United States

- [Companies with in-house R&D in the United States](https://www.tamtam.ai/l/r-and-d-companies-united-states) (6,796)
- [Companies with in-house R&D in California](https://www.tamtam.ai/l/r-and-d-companies-california) (1,276)
- [Companies with in-house R&D in Texas](https://www.tamtam.ai/l/r-and-d-companies-texas) (442)
- [Companies with in-house R&D in New York State](https://www.tamtam.ai/l/r-and-d-companies-new-york-state) (419)
- [Companies with in-house R&D in Massachusetts](https://www.tamtam.ai/l/r-and-d-companies-massachusetts) (396)
- [Companies with in-house R&D in Illinois](https://www.tamtam.ai/l/r-and-d-companies-illinois) (322)
- [Companies with in-house R&D in Michigan](https://www.tamtam.ai/l/r-and-d-companies-michigan) (287)
- [Companies with in-house R&D in Pennsylvania](https://www.tamtam.ai/l/r-and-d-companies-pennsylvania) (255)
- [Companies with in-house R&D in New Jersey](https://www.tamtam.ai/l/r-and-d-companies-new-jersey) (224)
- [Companies with in-house R&D in Florida](https://www.tamtam.ai/l/r-and-d-companies-florida) (221)
- [Companies with in-house R&D in Alabama](https://www.tamtam.ai/l/r-and-d-companies-alabama) (214)
- [Companies with in-house R&D in Georgia](https://www.tamtam.ai/l/r-and-d-companies-georgia) (173)
- [Companies with in-house R&D in Virginia](https://www.tamtam.ai/l/r-and-d-companies-virginia) (166)
- [Companies with in-house R&D in North Carolina](https://www.tamtam.ai/l/r-and-d-companies-north-carolina) (158)
- [Companies with in-house R&D in Wisconsin](https://www.tamtam.ai/l/r-and-d-companies-wisconsin) (154)
- [Companies with in-house R&D in Minnesota](https://www.tamtam.ai/l/r-and-d-companies-minnesota) (146)
- [Companies with in-house R&D in Washington State](https://www.tamtam.ai/l/r-and-d-companies-washington-state) (140)
- [Companies with in-house R&D in Colorado](https://www.tamtam.ai/l/r-and-d-companies-colorado) (113)
- [Companies with in-house R&D in Maryland](https://www.tamtam.ai/l/r-and-d-companies-maryland) (107)
- [Companies with in-house R&D in Indiana](https://www.tamtam.ai/l/r-and-d-companies-indiana) (104)
- [Companies with in-house R&D in New York](https://www.tamtam.ai/l/r-and-d-companies-new-york) (223)
- [Companies with in-house R&D in San Francisco](https://www.tamtam.ai/l/r-and-d-companies-san-francisco) (147)
- [Companies with in-house R&D in Houston](https://www.tamtam.ai/l/r-and-d-companies-houston) (129)
- [Companies with in-house R&D in San Jose](https://www.tamtam.ai/l/r-and-d-companies-san-jose) (103)

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Source: https://www.tamtam.ai/l/r-and-d-companies-ohio