# Foundations headquartered in the United States

Tamtam tracks 174 foundations headquartered in the United States. This list ranks the 50 largest by number of employees on LinkedIn, led by GRUNDFOS, The Hershey Company and Nemours Children's Health. Their median headcount is 1,153. Half of them were founded in 1958 or later. The most common headquarters are New York (4), Atlanta (3) and San Francisco (3).

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.

🇺🇸 United States · 50 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [GRUNDFOS](https://www.tamtam.ai/c/grundfos) (grundfos.to)<br>The company specializes in energy-efficient pumps that provide comfort, deliver water, remove wastewater, and support agriculture while striving for environmental protection | Industrial Machinery Manufacturing | 🇺🇸 Bjerringbro | 20,000 | 1945 |
| 2 | [The Hershey Company](https://www.tamtam.ai/c/the-hershey-company) (thehersheycompany.com)<br>Leading global snacks company producing iconic confectionery brands, committed to quality products, community support, and educational initiatives. | Manufacturing | 🇺🇸 Hershey | 11,057 | 1894 |
| 3 | [Nemours Children's Health](https://www.tamtam.ai/c/nemours-children-s-health) (nemours.org)<br>A non-profit children's health organization providing family-centered care, research, education, advocacy, and world-changing initiatives to improve the health of children | Hospitals and Health Care | 🇺🇸 Jacksonville | 6,960 | 1936 |
| 4 | [St. David's HealthCare](https://www.tamtam.ai/c/st-david-s-healthcare) (wwwprod104-stdavids-sitecore-cloud.dpxmedcity.net)<br>Leading healthcare system in Central Texas with seven hospitals, recognized for quality care, community investment, and ethical practices as part of HCA Healthcare | Hospitals and Health Care | 🇺🇸 Austin | 4,323 |  |
| 5 | [Gates Foundation](https://www.tamtam.ai/c/gates-foundation) (gatesfoundation.org)<br>Focus on improving health, reducing hunger and poverty in developing countries, and expanding educational opportunities in the United States. | Non-profit Organizations | 🇺🇸 Seattle | 4,160 | 2000 |
| 6 | [Pi Beta Phi Fraternity for Women](https://www.tamtam.ai/c/pi-beta-phi-fraternity-for-women) (pibetaphi.org)<br>An organization established in 1867, empowering women through a fraternity, foundation, and housing corporation, with over 300,000 members | Non-profit Organizations | 🇺🇸 Town and Country | 3,846 | 1867 |
| 7 | [Aultman Health Foundation](https://www.tamtam.ai/c/aultman-health-foundation) (aultman.org)<br>Leading provider of healthcare services in Stark County since 1892, offering high-quality care, educational opportunities, wellness programs, and community support | Hospitals and Health Care | 🇺🇸 Canton | 3,276 |  |
| 8 | [Alpha Delta Pi Sorority](https://www.tamtam.ai/c/alpha-delta-pi-sorority) (alphadeltapi.org)<br>An organization promoting sisterhood, values, academic excellence, and social responsibility for over 260,000 women in collegiate chapters and alumnae associations | Non-profit Organizations | 🇺🇸 Atlanta | 3,143 | 1851 |
| 9 | [TLC](https://www.tamtam.ai/c/tlc-raleigh) (nctlc.org)<br>Empowering individuals of all abilities since 1969, offering a diverse range of programs for children, adults, and families in on-site and community settings | Non-profit Organizations | 🇺🇸 Raleigh | 2,689 | 1969 |
| 10 | [The Apache Software Foundation](https://www.tamtam.ai/c/the-apache-software-foundation) (apache.org)<br>Global nonprofit supporting and sustaining open-source software projects, fostering developer communities, and advancing industry standards for public benefit. | Software Development | 🇺🇸 Wilmington | 2,474 | 1999 |
| 11 | [Howard Hughes Medical Institute (HHMI)](https://www.tamtam.ai/c/howard-hughes-medical-institute-hhmi) (hhmi.org)<br>Funding scientists and innovative research to advance human health, biology understanding, science education, and public engagement nationwide. | Research Services | 🇺🇸 Chevy Chase | 2,304 | 1953 |
| 12 | [Benefact Group](https://www.tamtam.ai/c/benefact-group) (benefactgroup.com)<br>Specialist financial businesses focused on ethical investment, insurance, broking, and advisory, with profits supporting charitable causes. | Financial Services | 🇺🇸 Brockworth | 2,052 |  |
| 13 | [The Henry M. Jackson Foundation for the Advancement of Military Medicine](https://www.tamtam.ai/c/the-henry-m-jackson-foundation-for-the-advancement-of-military-medicine) (hjf.org)<br>A nonprofit organization supporting military medical research, providing program management services to accelerate progress and advance Military Medicine | Research Services | 🇺🇸 Bethesda | 2,036 | 1983 |
| 14 | [Elizabeth Glaser Pediatric AIDS Foundation](https://www.tamtam.ai/c/elizabeth-glaser-pediatric-aids-foundation) (pedaids.org)<br>A global leader in ending HIV/AIDS and advocating for children's health through research, advocacy, and strengthening healthcare systems in affected regions | Non-profit Organizations | 🇺🇸 Washington | 2,024 | 1988 |
| 15 | [Kamehameha Schools](https://www.tamtam.ai/c/kamehameha-schools) (ksbe.edu)<br>Private charitable trust providing K-12 education, preschools, and community programs to improve Hawaiian students' capability and well-being. | Higher Education | 🇺🇸 Honolulu | 1,902 | 1887 |
| 16 | [American Century Investments](https://www.tamtam.ai/c/american-century-investments) (amcen.co)<br>Leading asset manager delivering investment results while funding medical research to improve health and support long-term client prosperity. | Financial Services | 🇺🇸 Kansas City | 1,900 | 1958 |
| 17 | [Sigma Kappa Sorority](https://www.tamtam.ai/c/sigma-kappa-sorority) (sigmakappa.org)<br>A national women's organization founded in 1874, focusing on empowering women through social, intellectual, and spiritual development to positively impact communities | Non-profit Organizations | 🇺🇸 Carmel | 1,749 | 1874 |
| 18 | [IstitutoAuxologico](https://www.tamtam.ai/c/istitutoauxologico) (auxologico.it)<br>A private foundation focused on human development from conception to maturity, specializing in research and treatment in various medical fields | Hospitals and Health Care | 🇺🇸 Milan | 1,488 | 1958 |
| 19 | [Hazelden Betty Ford Foundation](https://www.tamtam.ai/c/hazelden-betty-ford-foundation) (hazeldenbettyford.org)<br>A nonprofit treatment provider offering recovery solutions, addiction education, prevention programs, and advocacy for diverse communities nationwide Join the team today | Hospitals and Health Care | 🇺🇸 Center City | 1,458 | 1949 |
| 20 | [AARP Foundation](https://www.tamtam.ai/c/aarp-foundation) (aarp.org)<br>A nonprofit organization focused on ending senior poverty through economic opportunity, social support, legal advocacy, and innovative solutions for older adults | Non-profit Organizations | 🇺🇸 Washington | 1,408 | 1961 |
| 21 | [Seven Hills Foundation](https://www.tamtam.ai/c/seven-hills-foundation) (sevenhills.org)<br>Provide support and services to individuals with disabilities and life challenges across Massachusetts and Rhode Island through extensive programming. | Individual and Family Services | 🇺🇸 Worcester | 1,381 | 1951 |
| 22 | [Sigma Alpha Epsilon Fraternity](https://www.tamtam.ai/c/sigma-alpha-epsilon-fraternity) (sae.net)<br>This organization promotes friendship, scholarship, leadership, and service for lifelong members | Higher Education | 🇺🇸 Evanston | 1,299 | 1856 |
| 23 | [MTF Biologics](https://www.tamtam.ai/c/mtf-biologics) (mtfbiologics.org)<br>A global nonprofit organization specializing in tissue and organ donation, transplantation, and research, focused on saving and healing lives worldwide | Medical Equipment Manufacturing | 🇺🇸 Edison | 1,259 | 1987 |
| 24 | [The Research Foundation for SUNY](https://www.tamtam.ai/c/the-research-foundation-for-suny) (rfsuny.org)<br>Supporting SUNY researchers through innovative sponsored programs administration, the RF maximizes SUNY's research impact and fosters technology transfer for economic growth | Education Administration Programs | 🇺🇸 Albany | 1,232 | 1951 |
| 25 | [The Asia Foundation](https://www.tamtam.ai/c/the-asia-foundation) (asiafoundation.org)<br>A nonprofit organization focused on improving lives in Asia through initiatives related to governance, women empowerment, economic opportunity, environmental resilience, and international cooperation | Non-profit Organizations | 🇺🇸 San Francisco | 1,153 | 1954 |
| 26 | [Cystic Fibrosis Foundation](https://www.tamtam.ai/c/cystic-fibrosis-foundation) (cff.org)<br>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. | Non-profit Organizations | 🇺🇸 Bethesda | 1,152 | 1955 |
| 27 | [Central Maine Healthcare](https://www.tamtam.ai/c/central-maine-healthcare) (cmhc.org)<br>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 | Hospitals and Health Care | 🇺🇸 Lewiston | 1,072 | 1891 |
| 28 | [KIPP Foundation](https://www.tamtam.ai/c/kipp-foundation) (kipp.org)<br>Network of 279 public charter schools serving over 210,000 students and alumni with more than 16,000 educators. | Education Administration Programs | 🇺🇸 San Francisco | 1,069 |  |
| 29 | [Getty](https://www.tamtam.ai/c/getty) (getty.edu)<br>International cultural institution supporting visual arts through museum, research, conservation, and foundation programs promoting knowledge and preservation. | Museums, Historical Sites, and Zoos | 🇺🇸 Los Angeles | 1,057 | 1953 |
| 30 | [CDC Foundation](https://www.tamtam.ai/c/cdc-foundation) (cdcfoundation.org)<br>This organization collaborates with CDC, philanthropies, corporations, and individuals to raise funds and support critical health protection programs globally | Non-profit Organizations | 🇺🇸 Atlanta | 1,054 | 1992 |
| 31 | [Community Healthcare System](https://www.tamtam.ai/c/community-healthcare-system) (comhs.org)<br>A not-for-profit organization in Northwest Indiana focuses on enhancing health and quality of life through hospitals, community projects, and charitable endeavors | Hospitals and Health Care | 🇺🇸 Munster | 1,038 |  |
| 32 | [Nakupuna Companies](https://www.tamtam.ai/c/nakupuna-companies) (nakupuna.com)<br>Family-owned Native Hawaiian organization providing mission operations, IT, logistics, facilities, and environmental services to government clients nationwide. | Business Consulting and Services | 🇺🇸 Honolulu | 1,010 |  |
| 33 | [Yohanna](https://www.tamtam.ai/c/yohanna) (yohanna.org)<br>The company offers a platform for recruiters and job seekers to connect, with job listings and collaboration opportunities available | Non-profit Organizations | 🇺🇸 Sunnyvale | 994 |  |
| 34 | [Ford Foundation](https://www.tamtam.ai/c/ford-foundation) (fordfoundation.org)<br>Works to disrupt inequality globally by grant-making, reducing poverty, strengthening democratic values, and promoting international cooperation to advance human achievement. | Philanthropic Fundraising Services | 🇺🇸 New York | 987 | 1936 |
| 35 | [The Linux Foundation](https://www.tamtam.ai/c/the-linux-foundation) (linuxfoundation.org)<br>Organization for developers and companies to build ecosystems that accelerate open technology development and commercial adoption. | Software Development | 🇺🇸 San Francisco | 987 | 2007 |
| 36 | [German Marshall Fund of the United States](https://www.tamtam.ai/c/german-marshall-fund-of-the-united-states) (gmfus.org)<br>Nonpartisan organization promoting transatlantic partnership to address 21st-century challenges and opportunities between Europe and North America. | Think Tanks | 🇺🇸 Washington | 975 | 1972 |
| 37 | [Obama Foundation](https://www.tamtam.ai/c/obama-foundation) (obama.org)<br>Inspiring and empowering ordinary people to create positive change, connecting them to achieve more together through various initiatives worldwide | Non-profit Organizations | 🇺🇸 Chicago | 952 |  |
| 38 | [Servier Pharmaceuticals](https://www.tamtam.ai/c/servier-pharmaceuticals) (servier.us)<br>A global pharmaceutical company focused on innovation in oncology, cardiovascular, immuno-inflammatory, neuroscience, and diabetes, prioritizing patient well-being over profits | Pharmaceutical Manufacturing | 🇺🇸 Boston | 951 | 2018 |
| 39 | [Open Society Foundations](https://www.tamtam.ai/c/open-society-foundations) (opensocietyfoundations.org)<br>Provide grants and support to promote tolerance, transparency, human rights, and fairness in political, legal, and economic systems worldwide. | Non-profit Organizations | 🇺🇸 New York | 862 | 1979 |
| 40 | [Python Software Foundation](https://www.tamtam.ai/c/python-software-foundation) (python.org)<br>A non-profit organization that manages Python's intellectual property, licensing, trademarks, and supports Python development through grants, conferences, and special projects | Software Development | 🇺🇸 Beaverton | 845 | 2001 |
| 41 | [Stand Together](https://www.tamtam.ai/c/stand-together) (standtogether.org)<br>A philanthropic community supporting diverse changemakers to tackle root causes of societal issues by providing funding, network, and growth strategies | Non-profit Organizations | 🇺🇸 Arlington | 820 |  |
| 42 | [PUSD Foundation](https://www.tamtam.ai/c/pusd-foundation) (pusdfoundation.com)<br>Providing funding, resources, and support for educational programs and activities to enhance the student experience in the District | Education | 🇺🇸 San Diego | 818 | 2003 |
| 43 | [SAISD Foundation](https://www.tamtam.ai/c/saisd-foundation) (saisdfoundation.com)<br>The SAISD Foundation fundraises to support innovation and educational excellence in the San Antonio Independent School District through grants and scholarships | Non-profit Organizations | 🇺🇸 San Antonio | 815 | 1998 |
| 44 | [Arthritis Foundation](https://www.tamtam.ai/c/arthritis-foundation) (arthritis.org)<br>This organization works towards finding a cure for arthritis, providing resources, advocacy, and community connections to help individuals live their best lives | Non-profit Organizations | 🇺🇸 Atlanta | 813 | 1948 |
| 45 | [Tzu Chi USA](https://www.tamtam.ai/c/tzu-chi-usa) (tzuchi.us)<br>An international volunteer-based NGO providing humanitarian aid, disaster relief, medical assistance, education, and promoting humanistic values and community volunteerism | Non-profit Organizations | 🇺🇸 San Dimas | 805 | 1989 |
| 46 | [European Youth Parliament (EYP)](https://www.tamtam.ai/c/european-youth-parliament-eyp) (eyp.org)<br>Connects young Europeans to discuss current political issues, debate them in parliamentary assemblies, and actively shape their future through over 500 events annually. | Education Administration Programs | 🇺🇸 Berlin | 804 | 1987 |
| 47 | [The Posse Foundation](https://www.tamtam.ai/c/the-posse-foundation) (possefoundation.org)<br>An organization that identifies high school students with potential, placing them in diverse teams for full-tuition scholarships at partner colleges | Non-profit Organizations | 🇺🇸 New York | 783 | 1989 |
| 48 | [Wadhwani Foundation](https://www.tamtam.ai/c/wadhwani-foundation) (wadhwanifoundation.org)<br>A global non-profit founded in 2001 focused on accelerating job growth in emerging economies and enabling individuals to earn a sustainable income | Non-profit Organizations | 🇺🇸 Los Altos | 752 | 2001 |
| 49 | [Robin Hood](https://www.tamtam.ai/c/robin-hood) (robinhood.org)<br>Organization in New York addresses poverty by funding impactful programs and schools, providing essential services to empower families in need | Non-profit Organizations | 🇺🇸 New York | 715 | 1988 |
| 50 | [Tata Group - North America](https://www.tamtam.ai/c/tata-group-north-america) (tata.com)<br>Global business group with diverse operations including IT services, consulting, steel production, luxury hotels, automotive engineering, mining, consumer brands, and philanthropic activities | Mechanical Or Industrial Engineering | 🇺🇸 Arlington | 699 | 1868 |

## 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.

## More company lists in the United States

- [The largest companies in the United States](https://www.tamtam.ai/l/largest-companies-united-states) (104,975)
- [Multinational companies in the United States](https://www.tamtam.ai/l/multinational-companies-united-states) (16,197)
- [Manufacturers in the United States](https://www.tamtam.ai/l/manufacturers-united-states) (8,678)
- [Professional services firms in the United States](https://www.tamtam.ai/l/professional-services-firms-united-states) (7,079)
- [Retail chains in the United States](https://www.tamtam.ai/l/retail-chains-united-states) (6,981)
- [Financial services firms in the United States](https://www.tamtam.ai/l/financial-services-firms-united-states) (6,864)
- [Companies with in-house R&D in the United States](https://www.tamtam.ai/l/r-and-d-companies-united-states) (6,796)
- [IT Services and IT Consulting companies in the United States](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-united-states) (6,694)
- [SaaS companies in the United States](https://www.tamtam.ai/l/saas-companies-united-states) (6,410)
- [IT services companies in the United States](https://www.tamtam.ai/l/it-services-companies-united-states) (5,818)
- [Healthcare providers in the United States](https://www.tamtam.ai/l/healthcare-providers-united-states) (5,810)
- [Critical infrastructure operators in the United States](https://www.tamtam.ai/l/critical-infrastructure-operators-united-states) (5,801)
- [Hospitals and Health Care companies in the United States](https://www.tamtam.ai/l/hospitals-and-health-care-companies-united-states) (5,573)
- [Hardware manufacturers in the United States](https://www.tamtam.ai/l/hardware-companies-united-states) (5,346)
- [Software Development companies in the United States](https://www.tamtam.ai/l/software-development-companies-united-states) (5,311)
- [Financial Services companies in the United States](https://www.tamtam.ai/l/financial-services-companies-united-states) (5,012)
- [Companies with a mobile app in the United States](https://www.tamtam.ai/l/companies-with-mobile-app-united-states) (4,663)
- [Consulting firms in the United States](https://www.tamtam.ai/l/consulting-firms-united-states) (4,382)
- [AI companies in the United States](https://www.tamtam.ai/l/ai-companies-united-states) (4,246)
- [Public sector organisations in the United States](https://www.tamtam.ai/l/public-sector-organisations-united-states) (4,149)
- [Subscription businesses in the United States](https://www.tamtam.ai/l/subscription-businesses-united-states) (3,923)
- [Real Estate companies in the United States](https://www.tamtam.ai/l/real-estate-companies-united-states) (3,808)
- [Higher Education companies in the United States](https://www.tamtam.ai/l/higher-education-companies-united-states) (3,470)
- [Construction companies in the United States](https://www.tamtam.ai/l/construction-companies-united-states) (3,271)

## The same list elsewhere in United States

- [Foundations in California](https://www.tamtam.ai/l/foundations-california) (30)
- [Foundations in New York State](https://www.tamtam.ai/l/foundations-new-york-state) (27)
- [Foundations in New York](https://www.tamtam.ai/l/foundations-new-york) (25)

## The same list elsewhere

- [Foundations in the world](https://www.tamtam.ai/l/foundations-in-the-world) (1,835)
- [Foundations in North America](https://www.tamtam.ai/l/foundations-in-north-america) (196)

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Source: https://www.tamtam.ai/l/foundations-united-states