This list contains some of the largest foundations in the United States. Many are healthcare providers, such as Nemours Children's Health, which offers family-centered care, and St. David's HealthCare, a system in Central Texas. Other organizations focus on social causes, like the Gates Foundation, which works to improve health and reduce poverty globally, and Pi Beta Phi Fraternity for Women, empowering women since 1867. The list also includes The Hershey Company, a global snacks producer, and GRUNDFOS, specializing in energy-efficient pumps.
A notable pattern among these foundations is their diverse geographical distribution across the United States, from the West Coast (Gates Foundation in Seattle) to the East Coast (Nemours Children's Health in Jacksonville) and Hawaii (Kamehameha Schools in Honolulu). While many are long-established, such as Alpha Delta Pi Sorority founded in 1851, newer entities like the Gates Foundation from 2000 also feature.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
GRUNDFOSgrundfos.to
The company specializes in energy-efficient pumps that provide comfort, deliver water, remove wastewater, and support agriculture while striving for environmental protection |
20,000 | |||
| 2 |
The Hershey Companythehersheycompany.com
Leading global snacks company producing iconic confectionery brands, committed to quality products, community support, and educational initiatives. |
11,057 | |||
| 3 |
Nemours Children's Healthnemours.org
A non-profit children's health organization providing family-centered care, research, education, advocacy, and world-changing initiatives to improve the health of children |
6,960 | |||
| 4 |
St. David's HealthCarewwwprod104-stdavids-sitecore-cloud.dpxmedcity.net
Leading healthcare system in Central Texas with seven hospitals, recognized for quality care, community investment, and ethical practices as part of HCA Healthcare |
4,323 | |||
| 5 |
Gates Foundationgatesfoundation.org
Focus on improving health, reducing hunger and poverty in developing countries, and expanding educational opportunities in the United States. |
4,160 | |||
| 6 |
Pi Beta Phi Fraternity for Womenpibetaphi.org
An organization established in 1867, empowering women through a fraternity, foundation, and housing corporation, with over 300,000 members |
3,846 | |||
| 7 |
Aultman Health Foundationaultman.org
Leading provider of healthcare services in Stark County since 1892, offering high-quality care, educational opportunities, wellness programs, and community support |
3,276 | |||
| 8 |
Alpha Delta Pi Sororityalphadeltapi.org
An organization promoting sisterhood, values, academic excellence, and social responsibility for over 260,000 women in collegiate chapters and alumnae associations |
3,143 | |||
| 9 | 2,689 | ||||
| 10 |
The Apache Software Foundationapache.org
Global nonprofit supporting and sustaining open-source software projects, fostering developer communities, and advancing industry standards for public benefit. |
2,474 | |||
| 11 |
Howard Hughes Medical Institute (HHMI)hhmi.org
Funding scientists and innovative research to advance human health, biology understanding, science education, and public engagement nationwide. |
2,304 | |||
| 12 |
Benefact Groupbenefactgroup.com
Specialist financial businesses focused on ethical investment, insurance, broking, and advisory, with profits supporting charitable causes. |
2,052 | |||
| 13 |
The Henry M. Jackson Foundation for the Advancement of Military Medicinehjf.org
A nonprofit organization supporting military medical research, providing program management services to accelerate progress and advance Military Medicine |
2,036 | |||
| 14 |
Elizabeth Glaser Pediatric AIDS Foundationpedaids.org
A global leader in ending HIV/AIDS and advocating for children's health through research, advocacy, and strengthening healthcare systems in affected regions |
2,024 | |||
| 15 |
Kamehameha Schoolsksbe.edu
Private charitable trust providing K-12 education, preschools, and community programs to improve Hawaiian students' capability and well-being. |
1,902 | |||
| 16 |
American Century Investmentsamcen.co
Leading asset manager delivering investment results while funding medical research to improve health and support long-term client prosperity. |
1,900 | |||
| 17 |
Sigma Kappa Sororitysigmakappa.org
A national women's organization founded in 1874, focusing on empowering women through social, intellectual, and spiritual development to positively impact communities |
1,749 | |||
| 18 |
IstitutoAuxologicoauxologico.it
A private foundation focused on human development from conception to maturity, specializing in research and treatment in various medical fields |
1,488 | |||
| 19 |
Hazelden Betty Ford Foundationhazeldenbettyford.org
A nonprofit treatment provider offering recovery solutions, addiction education, prevention programs, and advocacy for diverse communities nationwide Join the team today |
1,458 | |||
| 20 |
AARP Foundationaarp.org
A nonprofit organization focused on ending senior poverty through economic opportunity, social support, legal advocacy, and innovative solutions for older adults |
1,408 | |||
| 21 |
Seven Hills Foundationsevenhills.org
Provide support and services to individuals with disabilities and life challenges across Massachusetts and Rhode Island through extensive programming. |
1,381 | |||
| 22 |
Sigma Alpha Epsilon Fraternitysae.net
This organization promotes friendship, scholarship, leadership, and service for lifelong members |
1,299 | |||
| 23 |
MTF Biologicsmtfbiologics.org
A global nonprofit organization specializing in tissue and organ donation, transplantation, and research, focused on saving and healing lives worldwide |
1,259 | |||
| 24 |
The Research Foundation for SUNYrfsuny.org
Supporting SUNY researchers through innovative sponsored programs administration, the RF maximizes SUNY's research impact and fosters technology transfer for economic growth |
1,232 | |||
| 25 |
The Asia Foundationasiafoundation.org
A nonprofit organization focused on improving lives in Asia through initiatives related to governance, women empowerment, economic opportunity, environmental resilience, and international cooperation |
1,153 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 26 |
Cystic Fibrosis Foundationcff.org
Nonprofit dedicated to finding a cure and improving lives for those with cystic fibrosis through research, care, and advocacy for better health experiences and outcomes. |
1,152 | |||
| 27 |
Central Maine Healthcarecmhc.org
Integrated healthcare delivery system in central Maine with hospitals, primary care, specialty services, trauma program, cancer center, and Mass General Hospital affiliation for advanced treatments |
1,072 | |||
| 28 |
KIPP Foundationkipp.org
Network of 279 public charter schools serving over 210,000 students and alumni with more than 16,000 educators. |
1,069 | |||
| 29 | 1,057 | ||||
| 30 |
CDC Foundationcdcfoundation.org
This organization collaborates with CDC, philanthropies, corporations, and individuals to raise funds and support critical health protection programs globally |
1,054 | |||
| 31 |
Community Healthcare Systemcomhs.org
A not-for-profit organization in Northwest Indiana focuses on enhancing health and quality of life through hospitals, community projects, and charitable endeavors |
1,038 | |||
| 32 |
Nakupuna Companiesnakupuna.com
Family-owned Native Hawaiian organization providing mission operations, IT, logistics, facilities, and environmental services to government clients nationwide. |
1,010 | |||
| 33 |
Yohannayohanna.org
The company offers a platform for recruiters and job seekers to connect, with job listings and collaboration opportunities available |
994 | |||
| 34 |
Ford Foundationfordfoundation.org
Works to disrupt inequality globally by grant-making, reducing poverty, strengthening democratic values, and promoting international cooperation to advance human achievement. |
987 | |||
| 35 |
The Linux Foundationlinuxfoundation.org
Organization for developers and companies to build ecosystems that accelerate open technology development and commercial adoption. |
987 | |||
| 36 |
German Marshall Fund of the United Statesgmfus.org
Nonpartisan organization promoting transatlantic partnership to address 21st-century challenges and opportunities between Europe and North America. |
975 | |||
| 37 |
Obama Foundationobama.org
Inspiring and empowering ordinary people to create positive change, connecting them to achieve more together through various initiatives worldwide |
952 | |||
| 38 |
Servier Pharmaceuticalsservier.us
A global pharmaceutical company focused on innovation in oncology, cardiovascular, immuno-inflammatory, neuroscience, and diabetes, prioritizing patient well-being over profits |
951 | |||
| 39 |
Open Society Foundationsopensocietyfoundations.org
Provide grants and support to promote tolerance, transparency, human rights, and fairness in political, legal, and economic systems worldwide. |
862 | |||
| 40 |
Python Software Foundationpython.org
A non-profit organization that manages Python's intellectual property, licensing, trademarks, and supports Python development through grants, conferences, and special projects |
845 | |||
| 41 |
Stand Togetherstandtogether.org
A philanthropic community supporting diverse changemakers to tackle root causes of societal issues by providing funding, network, and growth strategies |
820 | |||
| 42 |
PUSD Foundationpusdfoundation.com
Providing funding, resources, and support for educational programs and activities to enhance the student experience in the District |
818 | |||
| 43 |
SAISD Foundationsaisdfoundation.com
The SAISD Foundation fundraises to support innovation and educational excellence in the San Antonio Independent School District through grants and scholarships |
815 | |||
| 44 |
Arthritis Foundationarthritis.org
This organization works towards finding a cure for arthritis, providing resources, advocacy, and community connections to help individuals live their best lives |
813 | |||
| 45 |
Tzu Chi USAtzuchi.us
An international volunteer-based NGO providing humanitarian aid, disaster relief, medical assistance, education, and promoting humanistic values and community volunteerism |
805 | |||
| 46 |
European Youth Parliament (EYP)eyp.org
Connects young Europeans to discuss current political issues, debate them in parliamentary assemblies, and actively shape their future through over 500 events annually. |
804 | |||
| 47 |
The Posse Foundationpossefoundation.org
An organization that identifies high school students with potential, placing them in diverse teams for full-tuition scholarships at partner colleges |
783 | |||
| 48 |
Wadhwani Foundationwadhwanifoundation.org
A global non-profit founded in 2001 focused on accelerating job growth in emerging economies and enabling individuals to earn a sustainable income |
752 | |||
| 49 |
Robin Hoodrobinhood.org
Organization in New York addresses poverty by funding impactful programs and schools, providing essential services to empower families in need |
715 | |||
| 50 |
Tata Group - North Americatata.com
Global business group with diverse operations including IT services, consulting, steel production, luxury hotels, automotive engineering, mining, consumer brands, and philanthropic activities |
699 | |||
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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 Nov 12, 2026.
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