This selection of startup incubators and accelerators in the United States comprises a mix of educational institutions, venture capital firms, and technology-focused organizations. Notable entities include Y Combinator, a leading startup accelerator, Microsoft for Startups, which supports new companies with AI services and market access, and Techstars, an active pre-seed investor. Higher education institutions like Georgia Institute of Technology and Lehigh University also feature prominently, indicating their role in fostering early-stage innovation.
The data shows a strong concentration of these organizations in California, particularly in the San Francisco Bay Area, with companies like Y Combinator, X, The Moonshot Factory, 500 Global, and Plug and Play headquartered there. New York also emerges as a significant hub, hosting Techstars and Endeavor. Many of these organizations were founded in the 2000s, suggesting a common era of growth for the startup ecosystem.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Georgia Institute of Technologygatech.edu
Focused technological education and research for over 25,000 students across multiple colleges, fostering innovation through numerous research centers. |
19,765 | |||
| 2 |
Y Combinatorycombinator.com
Leading startup accelerator investing in thousands of companies, providing community, products, and programs to support founders throughout their journey. |
8,865 | |||
| 3 |
Microsoft for Startupsmicrosoft.com
Helps startups grow faster through credits, industry-leading AI services, technical documentation, support, and go-to-market opportunities. |
7,534 | |||
| 4 |
Lehigh Universitywww2.lehigh.edu
A premier residential research university offering rigorous academic programs in various fields to undergraduate and graduate students worldwide Located in Pennsylvania |
4,473 | |||
| 5 |
SUNY Downstate Health Sciences Universitydownstate.edu
Leading urban medical center offering education in medicine, nursing, public health, and health professions with an affiliated university hospital. |
3,757 | |||
| 6 |
X, The Moonshot Factoryx.company
A moonshot factory inventing and launching breakthrough technologies to create a radically better world |
3,149 | |||
| 7 |
500 Global500.co
Global venture capital firm investing early in fast-growing technology companies worldwide, with a focus on unlocking long-term value and driving economic growth |
2,719 | |||
| 8 |
Techstarstechstars.com
An active pre-seed investor funding thousands of startups annually, Techstars operates accelerators, funds, and networks to support global entrepreneurship with high success rates |
2,635 | |||
| 9 |
Endeavorendeavor.org
Global community supporting high-impact entrepreneurs in underserved markets through inspiration, investment, and a platform for growth and giving back. |
1,852 | |||
| 10 |
Founder Institutefi.co
Provides structured accelerator programs and global networks to help founders turn ideas into fundable startups and scale businesses globally. |
1,725 | |||
| 11 | 1,725 | ||||
| 12 |
Plug and Playplugandplaytechcenter.com
global platform connecting startups, corporations, investors across multiple industries to foster innovation, investment, and collaboration worldwide. |
1,311 | |||
| 13 |
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 | |||
| 14 |
Google for Startupsstartup.google.com
Connecting startups with people, products, and best practices to help them grow, scale, and solve important challenges. |
1,141 | |||
| 15 |
ODFjoinodf.com
Helping aspiring entrepreneurs start successful startups by providing guidance, resources, and a supportive community through a program focused on the exploration stage of company building |
801 | |||
| 16 | 755 | ||||
| 17 | 699 | ||||
| 18 |
Berkeley SkyDeckskydeck.berkeley.edu
An official startup accelerator affiliated with UC Berkeley, providing consulting, resources, mentorship, and connections to help Cal entrepreneurs launch and grow transformative startups |
624 | |||
| 19 | 588 | ||||
| 20 |
LvlUp Ventureslvlup.vc
Early-stage fund supporting startups with market validation, NextUp accelerator-venture studio, investor pitch decks, and fundraising assistance for going-to-market success |
554 | |||
| 21 |
DFG Ventures
A Los Angeles venture studio incubating, investing in, operating, and consulting scalable food businesses for the future |
529 | |||
| 22 |
Alchemist Acceleratoralchemistaccelerator.com
Venture-backed initiative accelerating seed-stage enterprises with technical co-founders, seeding seventy-five companies annually while facilitating institutional funding rounds through specialized demo day showcases and mentorship. |
528 | |||
| 23 |
Cornell Techtech.cornell.edu
Educates graduate students, develops leaders and technologies for the AI era through research, education, and new ventures, advancing economic and social prosperity. |
524 | |||
| 24 |
Unreasonableunreasonablegroup.com
An international company supporting growth-stage entrepreneurs, connecting investors with exclusive deals, and partnering to address global issues through profit-driven solutions |
519 | |||
| 25 |
Florence-Darlington Technical Collegefdtc.edu
Providing technical education and training to over 6,000 students across multiple counties with a large, modern campus facility. |
515 | |||
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 |
Gold Housegoldhouse.org
Gold House empowers and elevates Asian Pacific creators and companies through innovative programs and platforms, investing in, uniting, and promoting cultural change |
514 | |||
| 27 |
MassChallengemasschallenge.org
A global organization supporting entrepreneurs to innovate and drive sustainable change, with headquarters in the United States and eight international locations |
504 | |||
| 28 |
Technovationtechnovation.org
Empowers girls globally in tech education, fostering leadership and problem-solving through mobile app coding for real-world issues with mentor support. |
477 | |||
| 29 |
KiwiTechkiwitech.com
Global innovation ecosystem and partner offering support to startups, enterprises, and government authorities 600+ portfolio startups and clients like World Bank, P&G, and McKinsey |
461 | |||
| 30 |
Nucleatenucleate.xyz
A nonprofit organization empowering the next generation of biotech leaders, helping academics build transformational technologies by removing barriers |
422 | |||
| 31 | 417 | ||||
| 32 |
Techstars Startup Weekendtechstars.com
Educating and inspiring entrepreneurs globally through thousands of events in numerous cities, driven by passionate organizers and volunteers. Over 410K entrepreneurs educated. |
415 | |||
| 33 |
Village Capitalvilcap.com
Innovative support for startups addressing social and environmental challenges, providing critical capital and resources for business and impact growth |
412 | |||
| 34 |
StartXweb.startx.co
A community of entrepreneurs and experts focused on collaboration and impact, providing support and resources without taking equity |
390 | |||
| 35 | 389 | ||||
| 36 |
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 | |||
| 37 |
Store No. 8storeno8.com
An incubation arm of a major retailer, focused on transforming the future of retail through radical innovations in physical, digital, and virtual experiences |
371 | |||
| 38 |
South Park Commonssouthparkcommons.com
Community of technologists and builders helping each other explore and learn, and funding companies emerging from members' explorations. |
357 | |||
| 39 |
PeopleTech Partnerspeopletechpartners.com
Connects world-class People leaders with technology to scale solutions for forward-thinking companies, providing critical insights and feedback to founders to fuel success. |
345 | |||
| 40 |
CIC (Cambridge Innovation Center)cic.com
Global leader in driving innovation at scale, managing workspace, labs, and event spaces, with bespoke programming and industry cluster development to advance innovation |
345 | |||
| 41 |
Dubai Integrated Economic Zones Authoritydiez.ae
Specializing in creating a cutting-edge multimedia ecosystem, global networking, and holistic solutions to enhance Dubai's global positioning |
338 | |||
| 42 |
RA Capital Managementracap.com
Investment management firm focusing on healthcare, life sciences, and planetary health companies through evidence-based public and private funding. |
336 | |||
| 43 |
A2SV | Africa to Silicon Valleya2sv.org
A nonprofit social enterprise upskilling young software engineers, connecting them to top tech internships, and guiding them to create digital solutions for Africa's challenges |
333 | |||
| 44 |
Harvard Innovation Labsinnovationlabs.harvard.edu
The company provides a vibrant ecosystem for the Harvard community to explore innovation and entrepreneurship across various disciplines, fostering collaboration and supporting student ventures |
331 | |||
| 45 |
Capital Factorycapitalfactory.com
Central hub for entrepreneurs in Texas, connecting them with resources, investors, employees, mentors, and customers through meetups, classes, and coworking |
331 | |||
| 46 | 321 | ||||
| 47 | 319 | ||||
| 48 | 304 | ||||
| 49 |
Western Growerswga.com
Advocate for fruit, vegetable, and tree nut farmers by providing insurance, technology advancement, and regulatory support to ensure viability. |
295 | |||
| 50 |
Activateactivate.org
Activate empowers scientists through a fellowship program to launch startups addressing global challenges, ensuring their research is brought to market effectively |
284 | |||
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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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