| # | Company | Employees |
|---|---|---|
| 1 |
UT MD Andersonmdanderson.org
A leading cancer center focused on patient care, research, education, and prevention, with top rankings in cancer care and a mission to #EndCancer |
23,100 |
| 2 |
Houston Methodisthoustonmethodist.org
Comprehensive health system with hospitals, research institute, residency programs, outpatient and emergency care centers serving Greater Houston area. |
22,002 |
| 3 |
Memorial Hermann Health Systemmemorialhermann.org
Nonprofit health system in Greater Houston area providing patient-centered care with clinical expertise, innovation, and cutting-edge technology for improving health |
20,118 |
| 4 |
Baylor College of Medicinebcm.edu
Health sciences university in Texas Medical Center, conducting research, educating medical professionals, and providing healthcare locally and globally |
13,584 |
| 5 |
Texas Children's Hospitaltexaschildrenspeople.org
Comprehensive pediatric care, groundbreaking research, family-centered women's health services, and a supportive work environment focused on community health. |
13,069 |
| 6 |
UTHealth Houstonuth.edu
A leading health science center in Texas, offering a range of accredited programs and faculty practices for patient care in Houston |
9,157 |
| 7 |
U.S. Physical Therapy, Inc.usph.com
A publicly held company with hundreds of outpatient therapy clinics in 41 states, offering care for orthopedic and neurologic disorders through unique partnerships |
4,246 |
| 8 |
HCA Houston Healthcarehcahoustonhealthcare.com
A leading healthcare provider in the greater Houston area, offering a comprehensive network of hospitals, surgery centers, emergency centers, and diagnostic facilities |
3,934 |
| 9 |
PT Recruitersptrecruiters.com
A network of nearly 700 private practice clinics nationwide, each maintaining its own unique culture and brand |
3,351 |
| 10 |
St. Luke's Healthstlukeshealth.org
A healthcare system offering top-tier medical programs and facilities, affiliated with prestigious institutions and recognized for nursing excellence |
2,776 |
| 11 |
Belmont Village Senior Livingbelmontvillage.com
Integrated developer, owner, and operator of over 30 independent, assisted living, and memory care communities for older adults across the US and Mexico |
1,831 |
| 12 |
The Harris Center for Mental Health and IDDtheharriscenter.org
This organization provides mental health and intellectual/developmental disability services in Harris County through various programs, including services to individuals in the county jail |
1,824 |
| 13 |
St. Joseph Medical Centersjmctx.org
A hospital in Houston staffed by 600 board certified physicians and over 1,500 medical professionals, located on the edge of downtown |
1,288 |
| 14 |
Legacy Community Healthlegacycommunityhealth.org
Comprehensive healthcare system in Texas Gulf Coast region providing primary care, pediatrics, OB/GYN, behavioral health, dental, vision, specialty care, and pharmacy services |
1,089 |
| 15 |
Empower Pharmacyempowerpharmacy.com
Delivers personalized, high-quality compounded medications, customizing dosages, eliminating allergens, and creating multi-drug combinations, serving healthcare providers and individual patients nationwide and internationally. |
1,050 |
| 16 |
Veterans Evaluation Servicesves.com
Provides medical disability exams for veterans and service members, supporting the US Department of Veterans Affairs with high-quality, timely, and accurate services |
1,005 |
| 17 |
TIRR Memorial Hermannmemorialhermann.org
A leading rehabilitation hospital offering interdisciplinary services for individuals with disabling injuries or illnesses, focused on improving outcomes and maximizing independence through research and advocacy |
919 |
| 18 |
UT Physiciansutphysicians.com
Leading clinical practice associated with a renowned medical school, offering patient care, education, innovation, and a variety of specialties in Houston |
875 |
| 19 |
The University of Texas MD Anderson Cancer Centermdanderson.org
A world-renowned cancer center dedicated to patient care, research, education, and prevention with a mission to eliminate cancer through integrated programs |
872 |
| 20 |
Doctor Office
Hospital & healthcare company located in Houston, Texas, providing medical services and care to patients in the local community |
840 |
| 21 |
UT MD ANDERSON CANCER CENTERmdanderson.org
A healthcare organization based in Houston, Texas, focused on cancer treatment and research at their facility on HOLCOMBE BLVD |
834 |
| 22 |
Harris County Public Healthpublichealth.harriscountytx.gov
A public health department serving 47 million residents in Harris County, promoting wellness, safety, and diversity through various community-focused initiatives and services |
752 |
| 23 |
PsychPluspsychplus.com
Revolutionizing mental healthcare with accessible, affordable therapy and psychiatry services Offering virtual and in-person care for a variety of mental health conditions |
629 |
| 24 |
Baylor Geneticsbaylorgenetics.com
A genetics company based in Houston's Texas Medical Center, providing services to clients in 50 states and 16 countries |
622 |
| 25 |
Success On The Spectrumsuccessonthespectrum.com
A national franchise providing high quality ABA Therapy to children with Autism Spectrum Disorder, focused on reducing problem behaviors and improving life skills |
617 |
| 26 |
The Woman's Hospital of Texaswomanshospital.com
Specializing in women's and children's healthcare, our hospital offers expert care in various fields such as breast health, gynecology, obstetrics, and pediatrics |
609 |
| 27 |
Children's Memorial Hermann Hospitalmemorialhermann.org
Specialized medical center focusing on prenatal care, diagnostics, and interventions for fetal health and development, offering expert care to expectant parents |
596 |
| 28 |
Nova Medical Centersconcentra.com
Occupational healthcare provider offering drug testing, physicals, work-injury care, and physical therapy for on-the-job injuries to exceed patient and client expectations |
588 |
| 29 |
Gulf Coast Bloodgiveblood.org
This nonprofit organization provides a safe and sustainable supply of blood and related services to over 170 healthcare institutions in Texas |
587 |
| 30 |
DM Clinical Researchdmclinicalresearch.com
A network of clinical trial sites in Houston, Texas connecting research organizations to individuals for medical advancement through physician-conducted studies |
561 |
| 31 |
The University of Texas Health Science Center at Houston (UTHealth) School of Dentistrydentistry.uth.edu
A leading dental school offering education, patient care, and research programs in dentistry including DDS, BSDH, MSDH, and specialized degrees |
521 |
| 32 |
The Menninger Clinicmenningerclinic.org
A world leader in psychiatric treatment and research, offering comprehensive programs for adults, adolescents, and children with mental illness and addiction |
495 |
| 33 |
RMIrmiglobalsolutions.com
A solutions partner providing support in complex environments, managing risk through medical, security, and technical services |
443 |
| 34 |
Cenikor Foundationcenikor.org
Non-profit substance abuse treatment center providing a full continuum of care for adults and adolescents in Texas and Louisiana Offers sliding scale fees and accepts insurance |
419 |
| 35 |
LifeGiftlifegift.org
Organ procurement organization providing hope by partnering with hospitals to facilitate organ and tissue transplants for patients in need |
395 |
| 36 |
Houston Eye Associateshoustoneye.com
A leading team of ophthalmologists and optometrists providing comprehensive eye care, specialized treatments, and vision correction services in Houston for over 50 years |
389 |
| 37 |
Texas Medical Centertmc.edu
A leading medical city pioneering patient care, research, education, and prevention with a focus on advancing life sciences and innovation |
384 |
| 38 |
Nexus Health Systemsnexushealthsystems.com
Specialized hospitals and treatment centers for individuals with complex medical, developmental, behavioral, and mental health issues, guiding patients towards recovery and improved quality of life |
383 |
| 39 |
Next Level Medicalnextlevelurgentcare.com
Providing urgent medical care for non-life-threatening conditions to all ages in Houston, Austin, San Antonio, and Beaumont areas 7 days a week |
375 |
| 40 |
DePelchindepelchin.org
We work to improve the mental health and physical well-being of vulnerable children and families in Texas through various programs and services |
350 |
| 41 |
HOUSTON METHODIST WILLOWBROOK HOSPITALhoustonmethodist.org
A full-service acute-care hospital in Northwest Houston providing high-quality health care across various specialties in a warm environment |
346 |
| 42 |
Oncology Consultantsoncologyconsultants.com
A leading adult oncology and hematology practice in Houston, TX specializing in state-of-the-art cancer treatment in a compassionate environment Expanding services in the metropolitan area |
341 |
| 43 |
Houston Health Departmenthoustonhealth.org
Public health department in Houston, working with the community to promote and protect health, social well-being of residents, and environmental quality |
336 |
| 44 |
The Texas Heart Institute at Baylor College of Medicinetexasheart.org
A non-profit organization focused on advancing cardiovascular health through patient care, research, education, and outreach initiatives led by renowned physicians and scientists |
334 |
| 45 |
Texas Orthopedic Hospitalwwwprod104-texasorthopedic-sitecore-cloud.dpxmedcity.net
Specialized orthopedic hospital providing high-quality care, with a focus on wellness, mobility, and quick recovery Affiliated with a leading healthcare provider |
325 |
| 46 |
Newborn Intensive Care Specialist (NICS)newborndoc.com
Specialty healthcare organization providing top-quality services for ill, premature, or well babies, with a dedicated team of doctors and nurse practitioners |
320 |
| 47 |
IN-HOME ATTENDANT SERVICES, LTD.inhometexas.com
A company based in Houston, Texas, providing in-home attendant services at 2990 Richmond Ave, Suite 325 |
278 |
| 48 |
The Aspenwood Companytheaspenwoodcompany.com
A boutique manager of premium senior living communities in Texas, Arkansas, North Carolina, and Tennessee |
196 |
| 49 |
University of Houston College of Optometryopt.uh.edu
The company leads in optometry, vision science, and clinical care, with a mission to enhance vision for life with excellence and compassion |
186 |
| 50 |
Capitol Imaging Servicescapitolimagingservices.com
A leading outpatient imaging provider in southeast Louisiana, offering innovative services, advanced technology, and high-quality imaging at more affordable prices |
185 |
| 51 |
ZT Corporateztcorporate.com
A private equity firm established in 1997 with investments in healthcare services and automotive dealerships, driving value creation through collaboration and operational support |
120 |
| 52 |
New Teeth Dental Solutionsnewteethtexas.com
A private dental practice committed to providing safe, high-quality care using modern technology, digital imaging, and sterilization practices for lifelong oral health |
15 |
| 53 |
The MendCentermendcenter.org
The MendCenter provides compassionate care, support, and advocacy for individuals with chronic mental illness, offering specialized treatment plans and innovative services |
11 |
| 54 |
BayChoice Bariatricsbaychoicebariatrics.com
Weight loss surgery center specializing in personalized care, state-of-the-art procedures, and support to help clients achieve their weight loss goals |
3 |
| 55 |
Holcombe Dental Associatesholcombedental.com
Dedicated dental care provider focused on building relationships with patients, offering quality treatment options for optimal dental health |
2 |
Turn this list into pipeline
Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.
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 2, 2026.
More company lists in Houston
- The largest companies in Houston 1,988
- Oil and Gas companies in Houston 488
- Energy companies in Houston 418
- Manufacturers in Houston 173
- Critical infrastructure operators in Houston 161
- Hardware manufacturers in Houston 134
- IT Services and IT Consulting companies in Houston 131
- Retail chains in Houston 122
- IT services companies in Houston 121
- Publicly traded companies in Houston 112
- Transportation, Logistics, Supply Chain and Storage companies in Houston 109
- Consulting firms in Houston 99
- Logistics companies in Houston 95
- Real Estate companies in Houston 89
- Distributors and wholesalers in Houston 83
- Construction companies in Houston 75
- SaaS companies in Houston 72
- Education providers in Houston 68
- Financial services firms in Houston 68
- Financial Services companies in Houston 62
- Recruitment and staffing agencies in Houston 61
- Software Development companies in Houston 60
- Hospitals and Health Care companies in Houston 54
- Family-owned companies in Houston 45
The same list elsewhere in United States
- Healthcare providers in the United States 5,812
- Healthcare providers in California 573
- Healthcare providers in New York State 494
- Healthcare providers in Texas 408
- Healthcare providers in Florida 361
- Healthcare providers in Pennsylvania 264
- Healthcare providers in Illinois 262
- Healthcare providers in Massachusetts 213
- Healthcare providers in Ohio 182
- Healthcare providers in Tennessee 180
- Healthcare providers in Michigan 157
- Healthcare providers in North Carolina 153
- Healthcare providers in New Jersey 151
- Healthcare providers in Georgia 148
- Healthcare providers in Washington State 136
- Healthcare providers in Colorado 126
- Healthcare providers in Arizona 124
- Healthcare providers in Indiana 123
- Healthcare providers in Minnesota 121
- Healthcare providers in Virginia 121
- Healthcare providers in Missouri 118
- Healthcare providers in Alabama 115
- Healthcare providers in Maryland 105
- Healthcare providers in New York 155