| # | Company | Employees |
|---|---|---|
| 1 | 4,310 | |
| 2 |
Year Up Unitedyearup.org
Provides young adults from diverse backgrounds with training and opportunities to access meaningful careers, addressing workforce talent gaps and economic inequity. |
3,976 |
| 3 |
Sanctuarysanctuary.co.uk
A not-for-profit housing association providing affordable homes and care in England and Scotland, aiming to build sustainable communities |
3,510 |
| 4 | 3,272 | |
| 5 | 2,920 | |
| 6 |
Clinton Health Access Initiative, Inc.clintonhealthaccess.org
Global health organization improving health outcomes in low- and middle-income countries by strengthening health systems and negotiating price reductions for drugs and health tools |
2,274 |
| 7 |
Management Sciences for Healthmsh.org
Health organization partnering globally to strengthen health systems and improve access to quality care for vulnerable populations through local solutions and sustainable practices |
2,119 |
| 8 |
BSCbridgew.edu
Student focused on learning corporate communications, including media relations, public speaking, and organizational communication strategies for business environments. |
1,894 |
| 9 |
Advocatesadvocates.org
A company that supports individuals dealing with developmental, mental health, or life challenges by providing creative solutions and empowering them to thrive |
1,799 |
| 10 |
YMCA of Greater Bostonymcaboston.org
A leading social services provider in MA offering health and wellness programs, child care, summer camp, youth sports, teen leadership, workforce development, and community outreach |
1,175 |
| 11 |
Hult Prize Foundationhultprize.org
Inspiring young entrepreneurs worldwide to tackle global challenges by creating impactful startups aligned with UN Sustainable Development Goals |
1,087 |
| 12 |
Northeast Arcne-arc.org
This organization provides a wide range of services for people with disabilities and autism, as well as children at risk, and their families in Massachusetts |
917 |
| 13 |
Bay Cove Human Servicesbaycovehumanservices.org
Provides services for individuals and families facing challenges of developmental disabilities, aging, mental illness, and addiction in Greater Boston and southeastern Massachusetts |
883 |
| 14 | 830 | |
| 15 |
Millennium Campus Network (MCN)millenniumfellows.org
A global student network providing training and connections to undergraduates working on social impact projects to address humanity's greatest challenges |
811 |
| 16 |
Road Scholarroadscholar.org
The not-for-profit organization offers educational travel adventures for older adults worldwide to inspire learning, discovery, and cultural experiences |
793 |
| 17 |
The Home for Little Wanderersthehome.org
The organization provides support and care for vulnerable children through various programs to ensure their well-being and bright futures |
793 |
| 18 |
WORK Inc.workinc.org
A New England agency supporting individuals with disabilities to live fulfilling lives by providing necessary support services |
744 |
| 19 |
NACA - Neighborhood Assistance Corporation of Americanaca.com
A non-profit organization advocating for economic justice through home ownership, offering affordable mortgage options and assistance with loan modifications |
710 |
| 20 |
Old Colony YMCAoldcolonyymca.org
A nonprofit organization providing health and wellness programs for all ages, focusing on youth development, community outreach, and support for at-risk populations in Southeastern Massachusetts |
632 |
| 21 |
Mass Audubonmassaudubon.org
A leading conservation organization in New England addressing biodiversity loss, inequitable access to nature, and climate change through advocacy and education programs |
581 |
| 22 |
JA Worldwidejaworldwide.org
A global youth-serving NGO delivering hands-on learning in entrepreneurship, work readiness, and financial health, reaching millions of young people annually |
549 |
| 23 |
Action for Boston Community Development, Inc.bostonabcd.org
A nonprofit organization in Boston area providing tools for disadvantaged residents to transition from poverty to stability and success |
523 |
| 24 |
The Bridgespan Groupbridgespan.org
A global nonprofit advising social change leaders to address economic and social barriers, promoting equity and helping communities thrive |
509 |
| 25 |
Fidelity Charitableยฎfidelitycharitable.org
A public charity providing donor-advised fund program, supporting nonprofits with $845 billion in grants to make philanthropy accessible and effective |
506 |
| 26 |
Pine Street Innpinestreetinn.org
A leading provider of housing, shelter, outreach, and job training in Greater Boston, helping homeless individuals on the path to permanent housing and independence |
499 |
| 27 |
YMCA of the North Shorenorthshoreymca.org
An inclusive organization on the North Shore, nurturing kids, promoting healthy living, and fostering social responsibility through multiple YMCA locations |
492 |
| 28 |
Oxfam Americaoxfamamerica.org
Provides crisis support, advocates economic justice, gender equality, climate action, collaborates with local organizations worldwide to combat inequality. |
465 |
| 29 | 442 | |
| 30 |
YouthBuild Globalyouthbuild.org
Partnering with opportunity youth to develop skills and confidence through education, job training, and community leadership programs, fostering lifelong growth and success |
433 |
| 31 |
South Middlesex Opportunity Council (SMOC)smoc.org
A multi-service organization providing behavioral health, housing, employment, education, family, and nutrition services to low-income individuals and families in communities |
428 |
| 32 |
Appalachian Mountain Cluboutdoors.org
This organization promotes outdoor protection, enjoyment, and understanding They strive for healthy natural resources and a central role of the outdoors in people's lives |
418 |
| 33 |
People Incorporatedpeopleincfr.org
A human service agency in Southeastern Massachusetts providing diverse supports and services for individuals of all abilities to strengthen the community |
404 |
| 34 |
North American Family Institutenafi.com
A comprehensive organization offering mental health, addiction, child welfare, and rehabilitative programs to support individuals and families in achieving personal goals and thriving in their communities |
401 |
| 35 |
World Educationworlded.org
Dedicated to improving global health, education, and socioeconomic equity for individuals and communities through projects in over 50 countries since 1951 |
387 |
| 36 |
Community Teamworkcommteam.org
This organization works to strengthen communities, reduce poverty, and provide vital services through collaboration and creating opportunities for economic independence and personal growth |
366 |
| 37 |
The Key Program, Inckey.org
This organization offers support and services to troubled youth and their families, focusing on positive life skills, quality care, and community safety |
356 |
| 38 |
Facing History & Ourselvesfacinghistory.org
This organization uses history to educate and inspire students to stand up against bigotry and hate, promoting empathy, equity, and justice |
350 |
| 39 |
Boys and Girls Clubs of Bostonbgcb.org
The organization provides a safe environment, mentorship, and programs to help young people reach their full potential as responsible citizens and leaders |
342 |
| 40 |
HomeStarthomestart.org
An innovative nonprofit in Greater Boston working to end and prevent homelessness through eviction prevention, housing search assistance, and housing stability support services |
331 |
| 41 |
South Shore YMCAssymca.org
A nonprofit organization dedicated to empowering children, promoting health, and fostering community responsibility through various programs and services |
324 |
| 42 |
NTInticentral.org
This nonprofit organization supports disabled individuals and caregivers with advocacy, workforce development, and economic empowerment through work-at-home job opportunities and support services |
317 |
| 43 |
AgeSpanagespan.org
The company provides a range of home-based care, community support, and assisted living programs to help older adults in Massachusetts maintain independence and dignity |
315 |
| 44 |
The Learning Center for the Deaftlcdeaf.org
A national leader in educational and therapeutic services for deaf and hard of hearing individuals, providing knowledge, opportunity, and empowerment |
295 |
| 45 |
Kennedy-Donovan Centerkdc.org
A nonprofit organization providing support to individuals with developmental delays, disabilities, and family challenges through various programs and services |
249 |
| 46 |
Pathlightservicenet.org
An organization founded by mothers in 1952 dedicated to serving individuals with intellectual disabilities through innovative programs and family services |
248 |
| 47 |
The Community Groupthecommunitygroupinc.org
A private nonprofit organization offering various educational programs including early childhood, charter schools, consulting, and child care resources since 1970 |
222 |
| 48 |
MHA (Mental Health Association)linktr.ee
Aiming to be a premier provider of residential and support services, committed to innovation, creating equal opportunities, and improving individuals' lives |
219 |
| 49 |
Upstream USAupstream.org
The company is dedicated to improving availability and affordability of patient-centered contraceptive care in collaboration with healthcare leaders nationwide |
209 |
| 50 |
The Governor's Academythegovernorsacademy.org
The organization is the oldest boarding school in New England, shaping student leaders for a successful future and emphasizing civic responsibility |
186 |
| 51 |
Free Software Foundationfsf.org
Non-profit supporting free software movement, promoting universal freedom to distribute and modify computer software, based in Boston, USA |
186 |
| 52 |
MetroWest YMCAmetrowestymca.org
A nonprofit organization focused on promoting overall wellness through various programs and services for individuals in the community |
185 |
| 53 |
Merrimack Valley YMCAmvymca.org
A diverse organization with branches, camps, and programs in the Merrimack Valley, focused on promoting healthier lives for all |
183 |
| 54 |
Big Brother Big Sister Foundation, Inc.bbbsfoundation.org
A non-profit organization that turns gently worn goods into cash to support mentoring programs for children in Massachusetts Learn more at wwwbbbsfoundationorg |
183 |
| 55 |
Community Servingsservings.org
A not-for-profit program in Massachusetts providing nutritious meals and support to individuals and families living with critical illnesses like HIV/AIDS, Cancer, and more |
180 |
| 56 |
Soccer Without Borderssoccerwithoutborders.org
Utilizing soccer to empower refugee and immigrant youth through team-based programs, education, and cultural exchange for personal growth and success |
174 |
| 57 |
South Shore Elder Servicessselder.org
A non-profit organization providing services for elderly and disabled individuals in 11 cities in Massachusetts, promoting independence and community living |
174 |
| 58 |
Social Financesocialfinance.org
A national impact finance and advisory nonprofit that creates partnerships and investments to improve outcomes in education, economic mobility, health, and housing |
169 |
| 59 |
Precision Development (PxD)precisiondev.org
Global non-profit using technology and data to empower people in poverty, improve livelihoods, mitigate risks, and promote sustainability in developing countries through mobile information services |
168 |
| 60 |
The Possible Zonepossiblezone.org
An experiential learning program in Boston for young adults, focusing on developing an entrepreneurial spirit, skills, and networks for workforce readiness |
166 |
| 61 |
Bread of Lifebreadoflifemalden.org
A non-profit organization serving north of Boston, providing food and support to the hungry, homeless, and isolated with a faith-based mission |
166 |
| 62 |
The Guild for Human Servicesguildhumanservices.org
A non-profit organization providing education, support, and residential services for individuals with disabilities, recognized for innovative leadership and excellence in care |
163 |
| 63 |
Reach Out and Readbit.ly
A nonprofit organization promoting early literacy by providing new books to children, encouraging parents to read aloud for school readiness |
163 |
| 64 |
Big Brothers Big Sisters of Eastern Massachusettsemassbigs.org
This organization matches adult mentors with children to provide support, guidance, and positive relationships for improved outcomes in school and life |
160 |
| 65 |
Nonotuck Resource Associates, Inc.nonotuck.com
A Massachusetts-based organization providing Adult Family Care, Shared Living, and Day Services for individuals with disabilities, supporting over 450 families |
158 |
| 66 |
Morgan Memorial Goodwill Industriesgoodwillmass.org
A nonprofit organization providing job training, work opportunities, and low-cost goods to help individuals achieve independence and dignity through work |
157 |
| 67 |
RefugePointrefugepoint.org
RefugePoint seeks lasting solutions for highly vulnerable refugees by identifying and protecting those with no other means for survival |
155 |
| 68 |
Veritรฉverite.org
Global nonprofit fighting labor rights violations and human trafficking, working with corporations to ensure safe, fair, and legal conditions in global supply chains |
154 |
| 69 |
Xaverian Brothers High Schoolxbhs.com
A Catholic college-preparatory school for boys, focused on integrating spiritual, moral, intellectual, and social development to prepare graduates for higher education and service |
154 |
| 70 |
YMCA of Central Massachusettsymcaofcm.org
Offering a wide range of services including gyms, pools, preschool, summer camp, and high school programming for all ages and interests Join online today! |
154 |
| 71 |
VentureWellventurewell.org
Company focuses on growing, funding, and training STEM innovators and entrepreneurs to tackle global challenges and bring their ideas to impactful solutions |
150 |
| 72 |
International Institute of Buffaloiibuffalo.org
Improving the lives of immigrants and refugees in Western New York through community-based initiatives and resources |
150 |
| 73 |
Heading Homeheadinghomeinc.org
Dedicated to ending homelessness in Greater Boston by providing housing and critical services like life skills, financial literacy, and job training |
150 |
| 74 |
CHOICES4choices.org
This company creates a safe and supportive recovery community for adolescents with addiction and co-occurring disorders to reclaim their lives |
149 |
| 75 |
Boys & Girls Club of Worcesterbgcworcester.org
This company aims to help youth, especially those facing challenges, become responsible citizens and leaders through supportive relationships and mentorship |
40 |
| 76 |
The Future Societythefuturesociety.org
A nonprofit organization working to improve AI governance in the US and Europe to ensure alignment with societal needs |
38 |
| 77 | 22 |
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 Oct 24, 2026.
More company lists in Massachusetts
- The largest companies in Massachusetts 3,093
- SaaS companies in Massachusetts 322
- Software Development companies in Massachusetts 245
- Hospitals and Health Care companies in Massachusetts 193
- Financial services firms in Massachusetts 166
- Education providers in Massachusetts 160
- Higher Education companies in Massachusetts 157
- IT Services and IT Consulting companies in Massachusetts 147
- Venture capital and private equity firms in Massachusetts 141
- Financial Services companies in Massachusetts 127
- Manufacturers in Massachusetts 119
- AI companies in Massachusetts 116
- Critical infrastructure operators in Massachusetts 108
- Healthcare providers in Massachusetts 108
- Retail chains in Massachusetts 107
- Venture Capital and Private Equity Principals companies in Massachusetts 107
- Biotechnology Research companies in Massachusetts 97
- IT services companies in Massachusetts 93
- AI-native companies in Massachusetts 88
- Real Estate companies in Massachusetts 82
- Pharmaceutical companies in Massachusetts 82
- Contract manufacturers in Massachusetts 69
- Energy companies in Massachusetts 69
- Medical Equipment Manufacturing companies in Massachusetts 69
The same list elsewhere in United States
- Non-profit Organizations companies in the United States 1,966
- Non-profit Organizations companies in New York State 299
- Non-profit Organizations companies in California 249
- Non-profit Organizations companies in Texas 108
- Non-profit Organizations companies in Illinois 106
- Non-profit Organizations companies in Virginia 101
- Non-profit Organizations companies in Florida 74
- Non-profit Organizations companies in Pennsylvania 63
- Non-profit Organizations companies in Indiana 57
- Non-profit Organizations companies in Colorado 50
- Non-profit Organizations companies in Maryland 48
- Non-profit Organizations companies in Michigan 43
- Non-profit Organizations companies in Georgia 42
- Non-profit Organizations companies in Washington State 41
- Non-profit Organizations companies in New Jersey 37
- Non-profit Organizations companies in North Carolina 34
- Non-profit Organizations companies in Minnesota 33
- Non-profit Organizations companies in Missouri 33
- Non-profit Organizations companies in New York 199
- 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