| # | Company | Employees |
|---|---|---|
| 1 |
CareSourcecaresource.com
A transformative health care provider prioritizing members' well-being, offering coverage to millions with a focus on improving health and making a difference in communities |
6,620 |
| 2 |
The Reynolds and Reynolds Companyreyrey.com
provider of software, services, and forms for automobile dealerships to improve operations and enhance customer experience |
5,440 |
| 3 |
University of Daytonudayton.edu
Top-tier Catholic, Marianist research university shaping a brighter tomorrow through faith-driven commitment to the common good and community building |
5,182 |
| 4 |
Premier Health Partnerspremierhealth.com
Regional healthcare system offering hospital care, emergency services, outpatient clinics, home health, mental health, and substance abuse treatment in Southwest Ohio. |
4,992 |
| 5 |
Wright State Universitywright.edu
Provides inclusive, diverse undergraduate and graduate programs to over 11,000 students across multiple campuses with strong disability support. |
4,270 |
| 6 |
CCSScompclas.com
A Dayton, Ohio-based company specializing in computer hardware and software services, operating independently and not affiliated with credit card collection bureaus |
3,655 |
| 7 |
Dayton Children's Hospitalchildrensdayton.org
Specialized pediatric hospital providing children in a 20-county area with comprehensive medical care through a dedicated team of physicians and staff |
2,751 |
| 8 |
Sinclair Community Collegesinclair.edu
The company provides high-quality, affordable products and services that are easily accessible to customers |
2,700 |
| 9 |
Miami Valley Hospitalpremierhealth.com
A leading regional healthcare provider offering maternity, emergency, air ambulance services, transplant units, oncology, cardiology, rehabilitation, and surgical services Visit website for more information |
2,637 |
| 10 |
BPOonlinecareer360.com
Blue Paw Outdoors creates innovative outdoor designs and metal sculptures to bring people closer to nature, enriching lives and the environment |
2,197 |
| 11 |
AMIRIPROJECTyahoo.com
Empowering young African-American males with knowledge, skills, mentoring, and networking opportunities to pursue careers in healthcare and lead healthy lifestyles |
2,147 |
| 12 |
Dayton Freight Lines, Inc.daytonfreight.com
A union-free LTL freight carrier based in Ohio, offering fast service across 13 states with a focus on customer satisfaction and employee empowerment |
1,989 |
| 13 |
Winsupplywinsupplyinc.com
A leading distributor in residential and commercial construction materials, empowering entrepreneurs and providing solutions in various industries across America |
1,985 |
| 14 |
Woolpertwoolpert.com
A global architecture, engineering, geospatial, and strategic consulting firm serving public, private, and government clients worldwide with a focus on innovation and growth |
1,843 |
| 15 |
Dayton Public School Districtdps.k12.oh.us
Urban school district with 12,000 preschool to high school students Recognized for excellence in arts, academics, business, athletics, and civic leadership Offering a rigorous curriculum |
1,691 |
| 16 |
BWI GROUPbwigroup.com
Global automotive Tier-1 supplier providing safe, comfortable, smart, and sustainable Brake and Suspension System products worldwide, focusing on innovation and growth |
1,663 |
| 17 |
Evoke Technologiesevoketechnologies.com
Global IT services firm delivering customized software solutions, with expertise in Digitization, App Dev, AI/ML, Cloud Enablement, CRM/ERP, and Analytics Recognized for fostering a supportive work environment |
1,476 |
| 18 |
City of Daytondaytonohio.gov
Promoting diversity, arts, and innovative businesses in Southwest Ohio, with a focus on community engagement and growth |
1,288 |
| 19 |
LIONlionprotects.com
The company specializes in providing innovative personal protective equipment, fire training tools, and maintenance programs for first responders worldwide |
1,222 |
| 20 |
Centric Consultingcentricconsulting.com
Provides AI strategy, cyber risk management, cloud solutions, and tailored consulting services with experienced advisors and scalable teams. |
1,159 |
| 21 |
University of Dayton Research Instituteudayton.edu
A national leader in scientific and engineering research providing innovative solutions in materials, energy, aeropropulsion, and more with integrity and commitment |
855 |
| 22 |
Air Force Materiel Commandafmc.af.mil
Develops, acquires, and sustains aerospace power for defense through research, acquisition, management, logistics, testing, evaluation, and support services |
717 |
| 23 |
Clark Schaefer Hackettcshco.com
This company offers accounting and advisory services to clients nationwide, focusing on financial, technological, operational, and human resources support |
709 |
| 24 |
UNLISTEDunlistedhomes.com
A real estate technology platform connecting off-market homeowners with buyers and agents through AI-driven software to uncover untapped opportunities |
670 |
| 25 |
Montgomery County, Ohio (OH)mcohio.org
A community-focused organization in Ohio prioritizing innovation, inclusion, and collaboration to serve citizens and create value through investments and services |
565 |
| 26 |
Gosigergosiger.com
It is a family-owned company providing machine tools, automation solutions, and expert support tailored to manufacturing needs across the nation. |
531 |
| 27 | 517 | |
| 28 |
CESO, INC.cesoinc.com
A comprehensive firm providing end-to-end solutions in civil engineering, surveying, landscape architecture, environmental services, architecture, and interior design nationwide |
493 |
| 29 |
Norwood Medicalnorwoodmedical.com
Specializing in contract medical device manufacturing, this company has over 40 years of experience producing complex devices and implants with a focus on innovation and ingenuity |
492 |
| 30 |
WPAFB LOA
The company's purpose is to support the United States Air Force mission by enhancing the visibility and promotion of professional logistics officers |
491 |
| 31 |
Wright State University Boonshoft School of Medicinemedicine.wright.edu
Medical school in Dayton, Ohio, offering hands-on clinical training through affiliations with major teaching hospitals and health care institutions in the region |
454 |
| 32 | 452 | |
| 33 |
Goodwill Easterseals Miami Valleygesmv.org
Empowering individuals with disabilities and other needs to achieve independence through over 40 programs and services, job placement, and community integration |
423 |
| 34 |
Ohio's Hospiceohioshospice.org
Not-for-profit hospice partnership in Ohio dedicated to providing compassionate care, enhancing dignity, and reducing suffering in community-based settings |
419 |
| 35 |
MacAulay-Brown, Inc. (MacB), an Alion companymacb.com
Providing critical capabilities in intelligence, cybersecurity, research, IT, and more to address national security challenges for defense and federal agencies |
411 |
| 36 |
Montgomery County Sheriff's Officemcohiosheriff.org
The company is dedicated to serving the community by ensuring safety, reducing fear, and creating a secure environment in a cost-effective manner |
410 |
| 37 |
Ohio's Hospice of Daytonhospiceofdayton.org
A not-for-profit hospice provider in Ohio's Miami Valley offering superior care, grief support, and innovative services to patients and families |
397 |
| 38 |
STRATACACHEstratacache.com
Specializing in retail technology solutions for customer experiences, STRATACACHE accelerates digital transformation with integrated technologies to create frictionless in-store shopping experiences |
394 |
| 39 |
YMCA of Greater Daytondaytonymca.org
A charitable organization based on Christian principles, committed to enhancing the well-being of individuals and communities through youth development, healthy living, and social responsibility |
388 |
| 40 |
Graceworks Lutheran Servicesgraceworks.org
Non-profit organization providing senior living, affordable housing, and services for individuals with disabilities in Ohio, Indiana, and Kentucky |
388 |
| 41 |
Dorothy Lane Marketdorothylane.com
An award-winning gourmet grocer in the Midwest offering artisanal products, freshly baked bread, gourmet gifts, catering services, and memorable food experiences |
382 |
| 42 |
Friendship Villagetrousdalelc.org
A retirement community in Dayton, Ohio providing personalized care plans, clinical services, rehabilitation, and career development opportunities for staff members |
378 |
| 43 |
Grandview Medical Center Systemketteringhealth.org
A not-for-profit healthcare network offering high-quality services including maternity care, cancer treatment, heart care, brain/spine surgery, and various medical specialties |
368 |
| 44 |
Solvitasolvita.org
The company transforms donor gifts into hope through blood donations and tissue transplants, empowering people to save and enhance lives globally |
368 |
| 45 |
Bryan Collegebryan.edu
A small Christian liberal arts college in Dayton, TN offering a variety of degree programs on campus and online since 1930 |
366 |
| 46 |
Montgomery County Juvenile Courtmcjcohio.org
A court of law upholding the Constitution, administering laws justly, providing individualized justice, and focusing on rehabilitation and community protection |
366 |
| 47 |
Nelson Tree Service, LLCnelsontree.com
Offering diverse career opportunities in tree care and utility line clearance, providing training, progression, competitive pay and benefits nationwide |
352 |
| 48 |
United Theological Seminaryunited.edu
They prepare leaders to make disciples, emphasizing historic faith, scriptural holiness, and church renewal through theological formation, spiritual growth, and faithful discipleship |
343 |
| 49 |
Dayton Metro Librarydaytonmetrolibrary.org
A company that informs, inspires, and empowers its community through its services or products |
341 |
| 50 |
Community Blood Centersolvita.org
The company collects blood from volunteer donors to meet patient transfusion needs and distributes blood products and tissue to hospitals |
340 |
| 51 |
Providence Medical Group, Dayton, OHprovmedgroup.com
Providence Medical Group in Dayton, Ohio offers patient-centered healthcare with various specialties, including family medicine, pediatrics, sleep medicine, and aesthetics services |
327 |
| 52 |
Miller Valentine Constructionmillervalentine.com
A construction company with expertise in building commercial real estate across 25 states, focusing on strong client relationships and commitment delivery |
326 |
| 53 |
McGohan Brabendermcgohanbrabender.com
An independent health benefits leader offering innovative solutions to control costs and combat chronic disease in the workplace, with national presence and simplified navigation |
324 |
| 54 |
Scene75 Entertainment Centerscene75.com
An award-winning entertainment center with multiple locations offering indoor go-karts, mini-golf, laser tag, arcade games, simulators, bowling, and event spaces |
217 |
| 55 |
UES, A BlueHalo Companybluehalo.com
An award-winning science and technology company providing research, development, technical support, and management services to government and industry customers |
213 |
| 56 |
CDO Technologies, Inc.cdotech.com
Provider of tailored technology solutions for commercial and federal sectors, specializing in Asset Management and IT Services to enhance efficiency and affordability |
210 |
| 57 |
DRT Holdings, LLCdrtholdingsllc.com
Manufacturer and supplier of precision tools, systems, and components in metal packaging, aerospace, and precision machining industries, with a focus on quality and reliability |
196 |
| 58 |
CompTech Computer Technologiescomptech.com
Specialized provider of IT, engineering, and program management services to government agencies at federal, state, and local levels with various certifications and prestigious customers |
186 |
| 59 |
Dayton Dragons Professional Baseballmilb.com
A High-A baseball team affiliated with the Cincinnati Reds, playing games at Day Air Ballpark in Ohio and engaging fans on social media platforms |
182 |
| 60 |
Marsh McLennan Agency - Midwestmarshmma.com
A leading brokerage firm offering business insurance, employee benefits, retirement planning, and private client insurance solutions with a global reach |
181 |
| 61 |
Buckeye Home Health Carebuckeyehomehealthcare.com
Experienced healthcare professionals at a Medicare-Certified agency focus on increasing client independence to help them stay in their homes |
180 |
| 62 |
St. Leonard CHI Living Communitieschilivingcommunities.org
Continuing care retirement community offering personalized support, amenities, activities, and quality healthcare in Centerville, Ohio Member organization of CHI Living Communities |
179 |
| 63 |
King Solutionskingsolutionsglobal.com
A woman-owned 3PL company offering freight transportation, fulfillment, warehousing, and e-commerce solutions with a focus on customer-centric approach and tailored solutions |
173 |
| 64 |
Resonant Sciences LLCresonantsciences.com
Research and development firm in Dayton, Ohio specializing in FSS radome and antenna design, custom electronics, RF measurements, and hardware development |
173 |
| 65 |
Cassano's Pizza Kingcassanos.com
Originating in a small room in Ohio, this company started selling pizza alongside a grocery store and has since grown significantly |
172 |
| 66 |
NELSON TREE SERVICE, INC.nelsontree.com
A utilities company based in Dayton, Ohio that specializes in tree-related services |
170 |
| 67 |
The Greentree Groupgreentreegroup.com
A family-owned technology firm providing performance-based IT, financial, and program management solutions to government and private sector clients nationwide |
170 |
| 68 |
Projects Unlimited Inc.pui.com
Specializing in EMS and contract manufacturing for aerospace and defense, offering electronics assembly, box build integration, cable solutions, and repair services with top certifications and dedicated client support |
166 |
| 69 | 166 | |
| 70 |
Dayton Lamina Corporationdaytonlamina.com
A global leader in manufacturing punches, die components, and metal stamping tools, offering a comprehensive range of tooling solutions for various industries |
163 |
| 71 |
Alto Health Care Staffingaltostaffing.com
A professional staffing and HR firm specializing in the healthcare industry, dedicated to finding ideal positions for candidates and quality candidates for clients |
162 |
| 72 |
AIDA-Americaaida-global.com
A global leader in metal stamping press design, manufacture, and service, offering a wide range of complete metalforming systems worldwide |
160 |
| 73 |
University of Dayton School of Lawudayton.edu
Provides diverse law degree programs including J.D., LL.M., and specialized master's, focusing on practical legal problem-solving skills. |
157 |
| 74 |
Frickers Restaurantfrickers.com
This company offers Fricker's famous chicken wings, cold beer, live sports, and a fun atmosphere for friends to enjoy together |
157 |
| 75 |
Berry Networkberrynetwork.com
Specializing in dynamic digital marketing and advertising programs for multi-location brands, driving local leads through search, social, mobile, and reputation management |
153 |
| 76 |
Glasshouse Realty Groupglasshouserealty.com
Glasshouse Realty Group offers a transparent and stress-free real estate experience with knowledgeable agents who value professionalism and client relationships |
151 |
| 77 |
Five Rivers Health Centersfiverivershealthcenters.org
A growing Federally Qualified Health Center in Ohio, providing quality, cost-effective care for low-income patients with respect and dignity |
150 |
| 78 |
Dayton Livedaytonlive.org
A leading not-for-profit arts organization in downtown Dayton, presenting a wide variety of performances and operating multiple world class venues |
147 |
| 79 |
Cox Media Group Ohiocmglocalsolutions.com
A media group in Ohio with 93% market reach in Dayton-Springfield, owning powerful media brands and offering various marketing solutions for success |
133 |
| 80 |
DRT Aerospace, LLCdrtaerospace.com
DRT Aerospace streamlines supply chains by delivering high-quality machined components and assemblies for the global aerospace industry, utilizing advanced technologies |
123 |
| 81 |
Joyce/Daytonjoycedayton.com
Manufacturing machine and ball screw jacks, electric cylinders, and linear actuators for global OEMs, offering basic lifting devices and custom motion systems. |
87 |
| 82 |
Hollywood Gaming at Dayton Racewayhollywooddaytonraceway.com
Entertainment venue offering live harness racing, video lottery terminals, dining options, and live entertainment in Dayton Escape into a world of excitement |
84 |
| 83 |
NCT Technologies Group Inc.ncttech.com
The company offers comprehensive manufacturing services including laser cutting, fabrication, engineering, and machining for various industries like military, automotive, and retail |
61 |
| 84 |
PGP Glass USA, Inc.pgpfirstusa.com
Global specialist in premium glass packaging solutions for pharmaceutical, cosmetics, specialty food & beverage industries, offering design, production, and decoration services |
48 |
| 85 |
Ram Precision Industriesramprecision.com
High-tech manufacturing facility specializing in CNC machining, EDM, and precision manufacturing with advanced multi-axis machining centers for prototyping and production needs |
45 |
| 86 |
RUSH Expeditingrush-delivery.com
RUSH Transportation and Logistics provides top-of-the-line delivery services with professional drivers, state-of-the-art technology, and customized solutions for transportation, logistics, and courier service needs |
37 |
| 87 |
Dysinger, Incorporateddysinger.com
A company specializing in precision machining, sub-assembly support, and process engineering solutions, committed to high quality standards and customer satisfaction |
32 |
| 88 |
Shris Infotechshrisinfotech.com
A global IT services company, specializing in software development, consulting, outsourcing, and training, catering to the business requirements of clientele worldwide |
29 |
| 89 |
PUI Audio, Inc.puiaudio.com
Specializes in innovative audio components: indicators, transducers, piezo benders, speakers, sirens, and microphones for various applications, providing a total sound solution. |
27 |
| 90 |
Evanhoeevanhoe.com
A national IT solutions provider specializing in logistics, management consulting, facilities management, and systems design to improve efficiencies and drive revenue |
26 |
| 91 |
Tooling Zone
Machinery company based in Dayton, Ohio, specializing in tooling solutions for various industries and providing services at 4765 Gateway Cir |
26 |
| 92 |
BSF, Inc.bsfinc.net
The company provides personalized engineering expertise for connecting components, incorporating special requirements, and exceeding customer expectations in product development and service |
23 |
| 93 |
Unity Precision Manufacturingunityprecisionmfg.com
Specializing in precision machining for medical and commercial industries, we provide contract manufacturing with a focus on quality, performance, and timely delivery |
22 |
| 94 |
Hikma 503Bhikma503b.com
An FDA-registered sterile compounding business specializing in customized injectable medications for US hospitals, ensuring high quality and reliability |
21 |
| 95 |
MRS Electronic USAmrs-electronics.com
A company specializing in H2M and M2M application development for the automotive electronics industry, working in conjunction with its parent company |
21 |
| 96 |
Advanced Machinery Companiesadvancedmachinery.com
A machinery company offering high-quality products, training opportunities, division specializing in machining solutions, used machinery sales, appraisals, shipping, rigging, and relocation services |
15 |
| 97 |
Quaker Hospitality Holdings, LLC
Franchisee specializing in East Coast-style submarine sandwiches, offering a variety of delicious options to satisfy sandwich cravings |
15 |
| 98 |
Up and Running In Daytonupandrunningindayton.com
A leading fitness apparel and footwear retailer in Dayton and Troy, focused on exceptional customer service and providing solutions for all fitness levels |
13 |
| 99 |
CiceroAdams, LLCgocicero.com
A law firm based in Dayton, Ohio with two locations, specializing in criminal and civil cases, personal injury, and domestic relations |
12 |
| 100 |
RancoIT Solutionsrancoit.com
A global SAP professional services company that helps clients with SAP transformation, specializing in SAP, Oracle, Workday, and more with a diverse workforce |
8 |
Turn this list into pipeline
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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 Oct 24, 2026.
The same list elsewhere in United States
- The largest companies in the United States 91,669
- The largest companies in California 12,813
- The largest companies in New York State 10,485
- The largest companies in Texas 8,086
- The largest companies in Florida 4,945
- The largest companies in Illinois 4,175
- The largest companies in Pennsylvania 3,110
- The largest companies in Massachusetts 3,093
- The largest companies in Georgia 2,632
- The largest companies in Ohio 2,618
- The largest companies in New Jersey 2,569
- The largest companies in Virginia 2,503
- The largest companies in Michigan 2,346
- The largest companies in North Carolina 2,174
- The largest companies in Alabama 1,806
- The largest companies in Washington State 1,785
- The largest companies in Colorado 1,774
- The largest companies in Minnesota 1,700
- The largest companies in Maryland 1,527
- The largest companies in Wisconsin 1,482
- The largest companies in New York 6,920
- The largest companies in San Francisco 2,030
- The largest companies in Houston 1,791
- The largest companies in Chicago 1,668