| # | Company | Employees |
|---|---|---|
| 1 |
Alpha Chi Omega Fraternity, Inc.alphachiomega.org
An organization for women promoting leadership, sisterhood, and philanthropy through various entities dedicated to empowering strong, impactful women |
3,504 |
| 2 |
The American Legionlegion.org
Patriotic veterans service organization providing community service and mutual support for 2 million members worldwide through 13,000 Legion posts |
2,483 |
| 3 |
Alpha Xi Deltaalphaxidelta.org
Alpha Xi Delta is a national sorority dedicated to the personal growth of women through leadership, knowledge, service, and Sisterhood |
1,551 |
| 4 |
Alpha Gamma Deltaalphagammadelta.org
An international organization focused on personal development, service, and sisterhood, offering opportunities for growth, community impact, and employee support |
1,363 |
| 5 |
Sigma Theta Tau International Honor Society of Nursingsigmanursing.org
A non-profit organization founded by nurses in 1922 to develop leaders in nursing and improve global healthcare through empowerment and connection |
1,280 |
| 6 |
Kiwanis Internationalkiwanis.org
global network empowering members to support children through local service projects, fundraising, and community-driven initiatives worldwide. |
923 |
| 7 |
Alpha Epsilon Piaepi.org
An international Jewish fraternity with over 150 chapters fostering leadership and support for Jewish organizations, philanthropies, and causes |
793 |
| 8 |
Alpha Tau Omega Fraternityato.org
Organization fostering brotherhood and reconciliation among young men, inspired by post-Civil War ideals of peace and unity. |
790 |
| 9 |
Phi Kappa Psi Fraternityphikappapsi.com
A values-based men's social organization founded in 1852, providing brotherhood and support to members across the United States |
781 |
| 10 |
Tau Kappa Epsilon Fraternity (Official)tke.org
A college fraternity founded in 1899 with over 230 chapters in the US and Canada, boasting famous alumni like Ronald Reagan and Howard Schultz |
712 |
| 11 |
National FFA Organizationffa.org
A youth leadership development organization with over 760,000 members across the US, focused on fostering leadership, personal growth, and career success through agricultural education |
610 |
| 12 |
American Legion Auxiliarylegion-aux.org
A volunteer community supporting veterans, military, and their families by advocating for them, volunteering millions of hours, and raising funds |
590 |
| 13 |
Delta Sigma Phi Fraternitydeltasig.org
Men's fraternity with active chapters across the USA, promoting diversity, inclusion, and philanthropy Initiatives include mentorship platforms and support for the American Red Cross |
495 |
| 14 |
Circle K Internationalcirclek.org
An international organization with 12,000+ members across 17 nations, focused on community service, leadership development, and fostering friendships |
442 |
| 15 |
Delta Upsilon International Fraternitydeltau.org
An international fraternity focused on Building Better Men through Friendship, Character, Culture, and Justice, openly sharing ideals and rituals |
377 |
| 16 |
Alpha Sigma Alpha Sororityalphasigmaalpha.org
This company promotes friendship, women's influence, and high standards for members through intellectual, physical, social, and spiritual development, leadership, and service |
351 |
| 17 |
TechPointtechpoint.org
An industry-led growth initiative in Indiana's digital innovation economy, focused on expanding tech talent, enhancing resource connectivity, and amplifying success stories |
219 |
| 18 |
Easterseals Crossroadseastersealscrossroads.org
A nonprofit organization providing a wide range of services to help individuals with disabilities achieve personal goals and overcome life's challenges |
214 |
| 19 |
United Way of Central Indianauwci.org
A nonprofit organization dedicated to improving lives in Central Indiana through initiatives in education, income, health, and basic needs |
183 |
| 20 |
Disciples of Christdisciplesmissionfund.org
A faith-based organization that supports the Christian Church through creating congregations, training leaders, establishing camps, promoting anti-racism, and providing humanitarian relief worldwide |
182 |
| 21 |
Kappa Alpha Theta Headquarterskappaalphatheta.org
This organization provides support and opportunities for intellectual and personal growth to college women and alumnae since 1870 |
175 |
| 22 |
Outreachoutreachindiana.org
Faith-based nonprofit providing basic needs and resources to homeless teens and young adults in Indianapolis to empower them towards stability and transformation |
159 |
| 23 |
TeenWorksteenworks.org
Youth empowerment program in Indianapolis, Indiana focused on economic mobility for teens through various initiatives and opportunities |
159 |
| 24 |
Indiana University Lilly Family School of Philanthropyphilanthropy.indianapolis.iu.edu
A pioneering school focused on education and research in philanthropy, preparing leaders to create positive change globally through innovative programs and initiatives |
157 |
| 25 |
Damien Centerdamien.org
Empowering HIV/AIDS-affected communities in Indiana by providing comprehensive care, prevention, education, and support services to enhance lives and reduce suffering |
155 |
| 26 |
At Your School (AYS, Inc.)linktr.ee
A nonprofit organization in central Indiana providing Out-of-School Time programs focusing on academics, social-emotional learning, and enrichment activities for students |
152 |
| 27 |
Bosma Enterprisesbosma.org
A not-for-profit organization providing contract packaging, manufacturing, warehousing, and assembly services, creating employment opportunities for people who are blind or visually impaired |
148 |
| 28 |
Goodwill Commercial Servicesgoodwillbusiness.org
Contract manufacturing, assembly, packaging, and commercial services provider certified to ISO standards, creating employment opportunities for individuals with barriers to work |
146 |
| 29 |
Phi Kappa Theta Fraternityphikaps.org
A company that develops men into effective leaders who serve society, Fraternity, and God with passion and dedication |
146 |
| 30 |
Hood Medicine Initiative, Inchoodmedicine.org
A nonprofit collective of scientists and geeks using science and technology to improve health outcomes in marginalized communities and combat misinformation |
6 |
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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 10, 2026.
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- Non-profit Organizations companies in Washington 143
- Non-profit Organizations companies in Chicago 65
- Non-profit Organizations companies in Los Angeles 41
- Non-profit Organizations companies in San Francisco 38
- Non-profit Organizations companies in Boston 36
- Non-profit Organizations companies in Atlanta 27