| # | Company | Employees |
|---|---|---|
| 1 |
Mayo Clinicmayoclinic.org
A leading not-for-profit medical practice founded on values of patient-centered care, teamwork, professionalism, and excellence in healthcare services |
48,774 |
| 2 |
Wegmans Food Marketsjobs.wegmans.com
Regional supermarket chain headquartered in Rochester, NY, founded in 1916 Family-owned, employs over 50,000 people Ranked #4 on FORTUNE 100 Best Companies to Work For |
22,368 |
| 3 |
Paychexpaychex.com
Leading provider of HR, payroll, and benefits solutions for businesses in the US and Europe, serving over 740,000 clients and 22M worksite employees |
18,530 |
| 4 |
University of Rochesterrochester.edu
Private research institution providing undergraduate and graduate degrees across seven schools while operating a major health system and NCAA athletics program. |
11,592 |
| 5 |
Rochester Regional Healthrochesterregional.org
A physician-led integrated health services organization providing comprehensive care, innovative services, and cutting-edge technology to Western New York and beyond |
11,425 |
| 6 |
Rochester Institute of Technologyrit.edu
A diverse and collaborative community of creators and innovators leveraging technology, arts, and design to shape the future and improve the world |
9,197 |
| 7 |
University of Rochester Medicineurmc.rochester.edu
Academic medical center providing advanced patient care, conducting disease research, and educating future healthcare professionals including doctors, dentists, and nurses. |
8,483 |
| 8 |
Eastman Kodak Companykodak.com
Leading global manufacturer specializing in commercial printing, advanced materials, and chemicals with extensive patents and research history. |
8,449 |
| 9 |
Constellation Brandscbrands.com
International producer and marketer of beer, wine, and spirits with iconic brands, sustainable practices, and global operations in multiple countries. |
5,953 |
| 10 |
PT (Performance Technologies, Inc.)pt.com
Global supplier of advanced network solutions offering signaling systems for telecom networks and gateways for IP interworking in various industries |
5,805 |
| 11 |
Oakland Universityoakland.edu
Elevating learners in Greater Metro Detroit through diverse academic offerings, personalized instruction, research opportunities, and corporate partnerships for success and career immersion |
4,655 |
| 12 |
Mayo Clinic Health Systemmayoclinichealthsystem.org
Community-based health care provider offering highest-quality physical and virtual care through clinics, hospitals, and facilities in Iowa, Minnesota, and Wisconsin |
4,413 |
| 13 | 3,940 | |
| 14 |
Carestreamcarestream.com
Provides digital X-ray products, X-ray film for medical, non-destructive testing markets, alongside product, technical, service support globally, holding 1,000+ patents. |
3,895 |
| 15 |
Excellus BCBSexcellusbcbs.com
A nonprofit health insurance provider in upstate New York offering high-quality, affordable coverage and wellness resources to 15 million people |
3,798 |
| 16 |
Rochester City School Districtrcsdk12.org
An educational institution in Rochester, NY, serving over 26,000 students with a focus on equity, individual development, and preparing students for success in society |
3,697 |
| 17 |
Monroe Countymonroecounty.gov
Public sector employer in Monroe County, NY with 4600 employees across various fields Offers competitive pay, benefits, career advancement, and innovative services |
3,397 |
| 18 |
Albany International Corp.albint.com
Global producer of custom fabrics for paper and nonwovens, supplier of advanced composite aerospace parts including fan blades and cases. |
2,584 |
| 19 |
Monroe Community Collegemonroecc.edu
A community college in Rochester, NY, offering a wide range of education and training programs, student activities, and support services |
1,927 |
| 20 |
City of Rochestercityofrochester.gov
Local government serving over 210,000 residents, supporting innovation, education, research, and hosting major employers in Rochester area. |
1,841 |
| 21 |
LaBella Associateslabellapc.com
LaBella Associates is a nationally recognized Design Professional Corporation that creates partnerships with clients to deliver exceptional results in buildings, energy, infrastructure, and environmental projects |
1,613 |
| 22 |
Nazareth Universitywww2.naz.edu
A coeducational college outside Rochester,NY offering undergraduate, graduate, and continuing education programs in liberal arts, professional development, and experiential learning |
1,595 |
| 23 |
Rochester Public Schools ISD #535rochesterschools.org
A Minnesota-based school district with 24 facilities serving over 17,800 students from pre-Kindergarten to grade 12, inspiring and empowering students for success |
1,523 |
| 24 |
First Brands Group, LLC
First Brands Group, LLC is a company in the automotive aftermarket industry, offering category-leading brands such as TRICO, Carter, ANCO, Airtex, StrongArm, Autolite, and FRAM |
1,503 |
| 25 |
Kodak Alariskodakalaris.com
Provider of intelligent document processing solutions, scanners, software, and services simplifying business processes with innovative image science technology. |
1,463 |
| 26 |
St. John Fisher Universitysjf.edu
An independent, Catholic liberal arts university offering a wide range of academic majors, degree programs, and a warm campus community |
1,404 |
| 27 |
The Private Firmthefirm.net
The Private Firm provides experienced legal services to business owners, executives, and managers, helping them navigate opportunities, overcome difficulties, and achieve their goals |
1,354 |
| 28 |
Rochester Community Schoolsrochester.k12.mi.us
A world-class education provider serving 15,000 students in the Greater Rochester area, offering comprehensive K-12 curriculum, adult education, and award-winning programs |
1,293 |
| 29 |
EagleVieweagleview.com
Provides aerial imagery, property insights, and software, transforming work for government, construction, insurance, and solar industries through accurate data for informed decisions. |
1,286 |
| 30 |
Hillside Family of Agencieshillside.com
This organization in central and western New York offers a wide range of family and children services, including child welfare and mental health support |
1,214 |
| 31 |
Highland Hospital of Rochester NYurmc.rochester.edu
A leading hospital with a rich history of personalized care and innovation in specialties like bariatric surgery, joint replacement, and oncology |
1,157 |
| 32 |
Heritage Christian Servicesheritagechristianservices.org
Organization promoting inclusivity for individuals with disabilities through housing, employment, and community connections, as well as offering childcare and innovative community impact programs |
1,107 |
| 33 |
Transcattranscat.com
Provides test and measurement equipment and calibration services for technical industries, ensuring accuracy and compliance in customer operations. Offers new and rental equipment. |
1,084 |
| 34 |
Gleason Corporationgleason.com
Global leader in gear technology, offering gear design software, manufacturing machines, metrology equipment, and automation systems for various industrial markets worldwide |
1,051 |
| 35 |
Indotronix Avani Groupiic.com
Provides staffing, consulting, and technology solutions to Fortune 500 companies and government entities across US, Canada, and India. |
1,013 |
| 36 |
Navy Department Of Defenseonlinecareer360.com
This company based in Rochester, NY provides facilities services for the Navy Department of Defense in the United States |
1,005 |
| 37 |
Calerocalero.com
This company provides unified expense management solutions supporting Telecom, Mobility, and SaaS for thousands of clients worldwide with a focus on innovation and customer service |
928 |
| 38 |
Pangea Madepangeamade.com
A top provider of leather to the automotive sector, Pangea is known for elevating industry standards through innovative products and exceptional service |
850 |
| 39 |
ESL Federal Credit Unionesl.org
A locally owned financial institution serving over 413,000 members and 16,000 businesses with banking, mortgage, wealth management services, and community reinvestment |
835 |
| 40 |
Lifetime Assistance, Inc.lifetimeassistance.org
The company provides comprehensive services for individuals with intellectual and developmental disabilities, promoting independence, dignity, and respect through individualized support |
818 |
| 41 |
Olmsted Medical Centerolmmed.org
A not-for-profit healthcare provider in southeastern Minnesota offering a wide range of medical services with a focus on convenience and quality care |
788 |
| 42 |
Oakland University William Beaumont School of Medicineoakland.edu
A top-tier medical school dedicated to educating future physicians, conducting cutting-edge research, and promoting health in the community |
753 |
| 43 |
LeChase Constructionlechase.com
Established in 1944, this company offers top general construction and management services with a focus on quality, safety, and integrity for clients nationwide |
734 |
| 44 |
Mayo Clinic Laboratoriesmayocliniclabs.com
A global reference laboratory offering a sophisticated test catalog, pathology services, and collaborations with Mayo Clinic to advance patient care |
728 |
| 45 |
Olmsted County Minnesotaolmstedcounty.gov
A county in Minnesota with multiple cities and townships, serving a population of around 163,440 residents through public service excellence |
725 |
| 46 |
YMCA of Greater Rochesterrochesterymca.org
Providing community members with opportunities for growth, health, and connection regardless of age, income, or background through Y programs |
691 |
| 47 |
Roberts Wesleyan Universityroberts.edu
A private university in Rochester, NY offering a variety of degrees and programs to help students advance, succeed, and become inspirational leaders |
687 |
| 48 |
William Beaumont Hospital
A consumer services provider based in Michigan, offering healthcare services at 6700 Rochester Rd in Rochester to individuals and families |
652 |
| 49 |
Mr. Tire Auto Service Centersmrtire.com
The company offers complete car care, including maintenance, repairs, and tire services with knowledgeable professionals and a satisfaction guarantee on major tire brands |
640 |
| 50 |
University of Rochester School of Medicine and Dentistryurmc.rochester.edu
A school providing undergraduate and graduate medical education along with master's, PhD, and advanced certificates in biomedical and health sciences |
632 |
| 51 |
St. Ann's Communitystannscommunity.com
A leading senior housing and health services provider offering a continuum of care for older adults with various programs and services |
595 |
| 52 |
PathStone Corporationpathstone.org
A non-profit organization based in Rochester, NY providing community development and human services to low-income families in multiple states |
592 |
| 53 |
Rochester Community and Technical Collegerctc.edu
A historic community college in Minnesota providing exceptional education to empower students for success in a diverse society |
578 |
| 54 |
Ascension Crittenton Hospitalascension.org
A nationally ranked hospital with a wide range of medical specialties, advanced technology, teaching facilities, and a focus on compassionate patient care |
569 |
| 55 |
DePauldepaul.org
A progressive not-for-profit organization offering quality services including assisted living, mental health support, addiction prevention, vocational programs, and affordable housing to individuals in need |
537 |
| 56 |
Ceipalceipal.com
Staffing software platform designed by staffing industry experts, offering customizable solutions to streamline human resources and talent acquisition processes worldwide |
518 |
| 57 |
Indotronix International Corporationiic.com
A leading IT consulting firm providing services to Fortune 500 clients with expertise in staffing for various industries across verticals |
518 |
| 58 |
Crenlo Engineered Cabsengineeredcabs.com
A premier sheet metal fabricator with 60+ years experience, specializing in steel frame cab enclosures, rollover structures, and electronic enclosures for various markets |
516 |
| 59 |
ACM Global Laboratoriesacmgloballab.com
A global leader in clinical trial testing services with facilities in multiple countries, conducting over 20 million tests annually across various medical disciplines |
516 |
| 60 |
Gates Chili Central School Districtgateschili.org
The Gates Chili Central School District provides educational services to a diverse community in the towns of Gates and Chili near Rochester, NY |
508 |
| 61 |
Catholic Charities of the Diocese of Rochesterccdor.org
A nonprofit organization rooted in Catholic Social Teaching, serving communities across multiple counties with various programs to advance human dignity and compassion |
502 |
| 62 |
The Arc of Monroearcmonroe.org
Provider of programs and services for individuals with intellectual and developmental disabilities in Rochester, offering social development, employment support, and residential living opportunities |
488 |
| 63 |
Rochester Gas & Electricrge.com
An established utility company in Rochester providing electricity and natural gas services, supporting community initiatives, and promoting conservation and economic growth |
474 |
| 64 |
Butler/Tillbutlertill.com
A results-driven marketing agency focused on creating connections Independent, women-owned, employee-owned, and a B Corporation |
472 |
| 65 |
DiBella's Subsdibellas.com
A family-run business since 1918, offering high quality cold cuts, cheeses, and olives in a casual 1940's NY style atmosphere across multiple locations |
446 |
| 66 |
Lifetime Care Home Health Care and Hospicelifetimecare.org
Lifetime Care provides personalized home care services, hospice care, and advanced technologies like telemedicine to support thriving health care careers |
438 |
| 67 |
Rochester Midland Corporationrochestermidland.com
A leading supplier in North America of industrial cleaners, restroom care, food safety chemicals, and water treatment programs with global distribution and focus on sustainability |
432 |
| 68 |
Royal Park Hotelroyalparkhotelmi.com
A luxury hotel in downtown Rochester, Michigan, offering elegant accommodations, meeting spaces, and event venues for business and leisure travelers alike |
426 |
| 69 |
Frisbie Memorial Hospitalwwwprod104-frisbiehospital-sitecore-cloud.dpxmedcity.net
Dedicated to providing safe, effective, and patient-centered healthcare services to the community, while collaborating with other providers to enhance overall health |
425 |
| 70 |
Century Mold Co. Inc.centurymold.com
A leading plastic injection molder specializing in automotive parts, with multiple facilities across USA and Mexico, offering comprehensive molding capabilities and in-house mold design |
421 |
| 71 |
Conifer Realtyconiferllc.com
A respected builder and manager of affordable multi-family housing communities, with a proven track record of developing over 21,000 units Expanding nationally |
421 |
| 72 |
Pike Construction Servicespikecs.com
The company is a construction partner providing innovative solutions, project management, quality work, and prioritizing building relationships with clients |
417 |
| 73 |
Eastman School of Musicesm.rochester.edu
Passionate about music, enriching lives, transforming communities Educating musicians in performance, scholarship, and leadership for a meaningful future in music |
407 |
| 74 |
CGI Digitalcgidigital.com
CGI Digital partners with communities and small businesses to develop a strong web presence through video production, website development, and SEO management |
402 |
| 75 |
Mary Cariola Centermarycariola.org
A regional leader in personalized, evidenced-based education and life skill solutions for individuals with multiple, complex disabilities and their families Pioneers in innovative programs |
395 |
| 76 |
Center for Disability Rightscdrnys.org
A not-for-profit organization promoting independence and rights for people with disabilities through advocacy, services, and systemic change efforts |
393 |
| 77 |
HCR Home Carehcrhealth.com
A leader in home health care services across 25 counties in New York, providing quality patient care through employee-owned partnership and state-of-the-art technology |
392 |
| 78 |
GoNetspeedgonetspeed.com
Providing high-quality internet and voice services through fiber and DSL, focusing on transparency and excellent customer support. |
391 |
| 79 |
Letica Corporationletica.com
Innovative packaging solutions company offering custom designs, automation systems, and precision graphics using various technologies, materials, and in-house capabilities |
382 |
| 80 |
Mental Health Association of Rochestermharochester.org
A non-profit agency in Greater Rochester area providing mental wellness services and programs, serving over 15,000 clients annually with commitment to impartiality and confidentiality |
379 |
| 81 |
Mayo Clinic Alix School of Medicinecollege.mayo.edu
Prepares medical students to be physician leaders in 21st-century medicine with a patient-centered approach and Mayo Clinic's expertise and traditions |
374 |
| 82 | 356 | |
| 83 |
Roman Catholic Diocese of Rochesterdor.org
A religious organization serving a community of approximately 350,000 Catholics across 12 counties in upstate New York |
354 |
| 84 |
Foodlinkfoodlinkny.org
A Feeding America food bank providing food access programs, nutrition education, food banking operations, and a community kitchen to fight hunger |
350 |
| 85 |
Mindexmindex.com
Industry leader in software development based in Rochester, NY, specializing in enterprise applications and K-12 student management systems with a focus on innovation and customer collaboration |
346 |
| 86 |
City of Rochester, MNrochestermn.gov
A city in Minnesota committed to providing safe, efficient municipal services while prioritizing customer focus, respect, integrity, safety, and excellence |
336 |
| 87 |
Pro-Techsnopusher.com
Innovative company revolutionizing snow and ice management with Rubber Edge Sno Pusher and developing containment plows for various surface conditions |
335 |
| 88 |
Geospatial Systemsgeospatial.itt.com
A geospatial systems division, now part of Exelis Inc, providing innovative solutions for defense, intelligence, and commercial markets |
334 |
| 89 |
Trillium Healthtrilliumhealth.org
Health center providing LGBTQ+ inclusive care, primary and specialty medical services, supportive programs, and employment opportunities with equal opportunities and non-discrimination policies |
320 |
| 90 |
Lucky Eagle Casino & Hotelluckyeagle.com
A Chehalis Tribal enterprise offering a wide variety of career opportunities in casino, hospitality, and more, focused on unforgettable guest experiences |
320 |
| 91 |
Coordinated Care Services, Inc. (CCSI)ccsi.org
CCSI is a non-profit management services organization specializing in behavioral health and human services, striving to improve quality of life through partnerships and innovative solutions |
313 |
| 92 |
Monroe Community Hospitalmonroehosp.org
One of the largest skilled nursing facilities in New York State providing quality long-term care to individuals of all ages with complex health conditions |
313 |
| 93 |
M/E Engineeringmeengineering.com
This company provides mechanical and electrical engineering services, specializes in building commissioning, energy conservation, and offers LEED accreditation consulting services |
311 |
| 94 |
Home Properties (Lighthouse Management Services, LLC) โhomeproperties.com
A company that owned and managed apartment communities across the East Coast of the United States, ultimately closing in June 2019 |
297 |
| 95 |
Mayo Medical LaboratoriesMayoMedicalLaboratories.com
Global reference laboratory within Mayo Clinic, offering consultation services, outreach support, and comprehensive laboratory services to over 4,000 hospitals worldwide |
295 |
| 96 |
Quality Vision International (QVIยฎ)qvii.com
A global leader in designing and manufacturing dimensional measuring machines with optical, laser, and contact sensors for precision measurement in manufacturing |
290 |
| 97 |
SurePayrollsurepayroll.com
SurePayroll offers market-leading online payroll services for small businesses, household employers, CPAs, and bookkeepers with added HR and benefit solutions |
284 |
| 98 |
Arnold Magnetic Technologiesarnoldmagnetics.com
A global manufacturer of magnets, assemblies, and thin metals for various industries, specializing in high performance materials for smaller, lighter, more efficient motor systems |
283 |
| 99 |
SimuTech Groupsimutechgroup.com
Engineering partnership offering Ansys simulation products, technical support, training, consulting, and mentorship to improve product performance and innovation. |
267 |
| 100 |
Bergmannbergmannpc.com
An architecture, engineering, and planning firm delivering creative solutions to clients across the USA and Canada with a focus on sustainability and community engagement |
266 |
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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.
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- 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