| # | Company | Employees |
|---|---|---|
| 1 | 99,488 | |
| 2 |
State Streetstatestreet.com
Global financial leader providing comprehensive investment services, institutional asset management, multi-asset trading, and digital solutions to enhance portfolio performance and decision making. |
46,913 |
| 3 |
Iron Mountainironmountain.com
Global leader in storage and information management services, partnering with organizations worldwide to protect and unlock the value of their assets and data |
24,357 |
| 4 |
Wayfairaboutwayfair.com
Destination for all things home, offering expert customer service, tools for easy shopping, and wide selection to help create personalized spaces |
12,524 |
| 5 | 8,184 | |
| 6 |
Toastpos.toasttab.com
Toast empowers restaurants with cloud-based software and hardware to streamline operations, drive revenue, and enhance guest experience through POS, marketing, and HR solutions |
7,762 |
| 7 |
Vertex Pharmaceuticalsvrtx.com
Global biotechnology company focusing on creating medicines for serious and life-threatening diseases, with a pioneering history in treating cystic fibrosis |
6,382 |
| 8 |
American Toweramericantower.com
Global provider of digital infrastructure supporting mobile and broadband networks, enabling connectivity, innovation, and bridging digital divides worldwide. |
6,111 |
| 9 |
Dynatracedynatrace.com
This company specializes in providing a platform that unifies observability, business, and security data with AI-driven analytics and automation to optimize cloud operations and ensure flawless digital experiences |
6,090 |
| 10 |
DraftKings Inc.careers.draftkings.com
The company is committed to creating popular games and betting experiences, leading the way in sports entertainment, innovation, and global collaboration |
5,760 |
| 11 |
Cabot Corporationcabotcorp.com
Global specialty chemical and performance materials company providing solutions to address current challenges and future customer needs worldwide. |
3,719 |
| 12 |
Rapid7rapid7.com
Global leader in AI-powered managed cybersecurity operations, advancing organizations' cyber resilience through integrating security data, AI, and threat intelligence to reduce risk and disrupt attackers. |
3,268 |
| 13 |
Klaviyoklaviyo.com
Unified customer platform empowering brands with ownership of consumer data to automate personalized email/SMS communications, foster customer relationships, and drive growth |
2,902 |
| 14 |
Haemoneticshaemonetics.com
A global healthcare company offering innovative medical products and solutions to improve patient care and reduce healthcare costs in various medical markets |
2,530 |
| 15 |
argenxargenx.com
Global immunology company focused on developing novel antibody-based medicines for severe autoimmune diseases through collaborations with leading researchers |
2,315 |
| 16 |
The Boston Beer Companybostonbeer.com
A passionate beer company with 40 years of brewing experience, focused on cultivating talent and pushing boundaries while having fun |
2,262 |
| 17 |
Flywireflywire.com
Global payments enablement and software company combining proprietary networks with vertical-specific technology to streamline complex billing across education, healthcare, travel, and B2B sectors. |
1,308 |
| 18 | 1,300 | |
| 19 |
Boston Properties (BXP)linkedin.com
Real estate investment and development across six major U.S. regions, focusing on premier workplace properties and national growth. |
630 |
| 20 |
Ginkgo Bioworksginkgo.bio
Using biology to design, develop, and optimize products for various commercial applications, with a focus on sustainable solutions and promoting diversity and inclusion |
532 |
| 21 |
Rhythm Pharmaceuticals Inc.rhythmtx.com
A biopharmaceutical developing therapies for rare MC4R pathway diseases using the Rhythm Engine to improve understanding, diagnosis, and treatment |
471 |
| 22 |
Allied Mindsalliedminds.com
Early-stage investor in technology and life sciences, originating from US federally funded labs and universities, focusing on breakthrough science in connectivity, space, and medical devices |
400 |
| 23 |
SeaChange Internationalseachange.com
A leading provider of Video Delivery Software Solutions, powering cloud and on-premise platforms for over 50 million subscribers worldwide |
375 |
| 24 |
CRISPR Therapeuticscrisprtx.com
A leading gene editing company developing gene-based medicines for serious diseases, using CRISPR/Cas9 technology and collaborating with industry leaders |
351 |
| 25 |
Praxis Precision Medicines, Inc.praxismedicines.com
Clinical-stage biopharmaceutical company developing therapies for CNS disorders by translating genetic insights into selecting biological targets for rare and prevalent neurological disorders |
233 |
| 26 |
CloudCallcloudcall.com
The company offers a communication system that integrates with CRM to improve productivity, data quality, and capture all conversations for sales and recruitment teams |
69 |
| 27 |
Elicio Therapeuticselicio.com
Clinical-stage biotech company developing novel lymph node-targeted immunotherapies to enhance the immune system's cancer-fighting capabilities against aggressive cancers |
47 |
| 28 |
RONA Glasswareronausa.com
A European glassworks company with over 130 years of history, known for producing luxurious, durable glassware tailored to evolving styles |
2 |
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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 2, 2026.
More company lists in Boston
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- Non-profit Organizations companies in Boston 36
- Real Estate companies in Boston 34
- Technology, Information and Internet companies in Boston 33
- Business Consulting and Services companies in Boston 32
- Cybersecurity companies in Boston 27
The same list elsewhere in United States
- Publicly traded companies in the United States 3,096
- Publicly traded companies in California 509
- Publicly traded companies in Texas 315
- Publicly traded companies in New York State 296
- Publicly traded companies in Illinois 154
- Publicly traded companies in Florida 151
- Publicly traded companies in Massachusetts 125
- Publicly traded companies in Pennsylvania 117
- Publicly traded companies in New Jersey 94
- Publicly traded companies in Ohio 94
- Publicly traded companies in Virginia 92
- Publicly traded companies in North Carolina 91
- Publicly traded companies in Georgia 90
- Publicly traded companies in Alabama 77
- Publicly traded companies in Colorado 65
- Publicly traded companies in Arizona 64
- Publicly traded companies in Michigan 59
- Publicly traded companies in Washington State 57
- Publicly traded companies in Minnesota 55
- Publicly traded companies in Tennessee 51
- Publicly traded companies in New York 210
- Publicly traded companies in Houston 112
- Publicly traded companies in Chicago 71
- Publicly traded companies in San Francisco 63