These Boston-headquartered companies represent a mix of established multinational corporations and a few younger firms, primarily in financial services, technology, and consulting. Notable examples include Fidelity Investments, offering diversified financial services, and GE Vernova, focused on electrifying and decarbonizing the planet. Boston Consulting Group (BCG) is a global management consulting firm, while Iron Mountain specializes in storage and information management. Wayfair is a destination for home goods, and Vertex Pharmaceuticals develops medicines for serious diseases.
A clear pattern among these companies is their global reach, with many operating across diverse international markets. The presence of several financial services and consulting firms, alongside significant technology and industrial players, indicates a diversified but mature corporate landscape in Boston.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 99,488 | ||||
| 2 |
Fidelity Investmentsfidelity.com
Financial well-being through diversified market-leading services for individuals, families, employers, wealth management firms, and institutions using trillions in administered and discretionary assets. |
84,668 | |||
| 3 |
GE Vernovalinktr.ee
A purpose-built company focused on electrifying the planet and decarbonizing it through a diverse portfolio of energy businesses, ensuring reliable and sustainable energy |
70,646 | |||
| 4 |
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 | |||
| 5 |
Boston Consulting Group (BCG)bcg.com
A global management consulting firm that partners with organizations to tackle challenges, drive growth, and create positive societal impact through innovative solutions |
40,412 | |||
| 6 |
Liberty Mutual Insurancelibertymutualgroup.com
Global leader in property and casualty insurance dedicated to fostering career growth, social responsibility, sustainability, diversity, and innovative solutions for customers worldwide |
37,734 | |||
| 7 |
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 | |||
| 8 |
Publicis Sapientpublicissapient.com
A digital business transformation partner, specializing in strategy, product, experience, engineering, data, and delivering impactful solutions to global organizations |
24,251 | |||
| 9 |
Northeastern Universitynortheastern.edu
Global research university combining experiential learning with cooperative education, offering diverse programs and addressing health, security, and sustainability challenges worldwide. |
17,385 | |||
| 10 |
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 | |||
| 11 |
CDM Smithcdmsmith.com
This company provides comprehensive solutions in water, environment, transportation, energy, and facilities to worldwide public and private clients |
8,617 | |||
| 12 | 8,184 | ||||
| 13 |
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 | |||
| 14 | 7,373 | ||||
| 15 |
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 | |||
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. | |||||
| 16 |
American Toweramericantower.com
Global provider of digital infrastructure supporting mobile and broadband networks, enabling connectivity, innovation, and bridging digital divides worldwide. |
6,111 | |||
| 17 |
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 | |||
| 18 | 5,917 | ||||
| 19 |
Veolia | North Americaveolianorthamerica.com
Provides resource management solutions including water decontamination, toxic waste handling, fossil fuel alternatives, wastewater reuse, and battery recycling for cities and industries. |
5,812 | |||
| 20 |
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 | |||
| 21 |
Alexion Pharmaceuticals, Inc.alexion.com
Development of innovative medicines targeting rare diseases, focusing on complement system biology, expanding global reach to serve patients worldwide. |
5,112 | |||
| 22 |
Xceedancexceedance.com
Provider of strategic operations support, technology, and data services for insurance organizations globally, enhancing efficiencies and optimizing business processes with expertise in underwriting, analytics, and more |
4,963 | |||
| 23 |
Conversecareers.converse.com
This company creates iconic street style sneakers like Chuck Taylor All Stars and One Stars that redefine sport, street, and creative culture |
4,522 | |||
| 24 |
L.E.K. Consultinglek.com
Global management consulting firm providing deep industry expertise and rigorous analysis to help business leaders improve performance and create greater shareholder returns. |
4,271 | |||
| 25 |
Aquentaquent.com
Global work solutions company providing talent, technology, and services for businesses through recruiting, creative strategy, project management, and more |
4,071 | |||
| 26 |
Reebokreebok.com
It designs and creates fitness gear and experiences, aiming to inspire individuals to achieve their best physically, mentally, and socially. |
4,008 | |||
| 27 |
Goodwingoodwinlaw.com
Global law firm providing litigation, regulatory compliance, advisory services, and complex transactions for clients in diverse industries worldwide. |
3,975 | |||
| 28 |
Cabot Corporationcabotcorp.com
Global specialty chemical and performance materials company providing solutions to address current challenges and future customer needs worldwide. |
3,719 | |||
| 29 |
Berklee College of Musicberklee.edu
A leading college offering top-tier music education for students around the world |
3,696 | |||
| 30 |
Wellington Managementwellington.com
Independent investment management firm serving diverse clients worldwide with comprehensive capabilities across global equity, fixed income, alternatives, and private markets. |
3,609 | |||
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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 11, 2026.
More company lists in Boston
- The largest companies in Boston 1,089
- SaaS companies in Boston 193
- Software Development companies in Boston 145
- Financial services firms in Boston 127
- AI companies in Boston 123
- Professional services firms in Boston 104
- Venture capital and private equity firms in Boston 99
- Companies with in-house R&D in Boston 88
- Education providers in Boston 87
- Subscription businesses in Boston 87
- Financial Services companies in Boston 86
- Venture Capital and Private Equity Principals companies in Boston 78
- Companies with a mobile app in Boston 62
- Consulting firms in Boston 58
- Data and analytics companies in Boston 57
- IT Services and IT Consulting companies in Boston 56
- AI-native companies in Boston 51
- IT services companies in Boston 50
- Higher Education companies in Boston 48
- Investment Management companies in Boston 47
- Hospitals and Health Care companies in Boston 46
- Critical infrastructure operators in Boston 44
- Healthcare providers in Boston 42
- Non-profit Organizations companies in Boston 36
The same list elsewhere in United States
- Multinational companies in the United States 16,197
- Multinational companies in California 2,592
- Multinational companies in New York State 2,216
- Multinational companies in Texas 1,418
- Multinational companies in Florida 897
- Multinational companies in Illinois 831
- Multinational companies in Massachusetts 637
- Multinational companies in New Jersey 624
- Multinational companies in Georgia 521
- Multinational companies in Pennsylvania 472
- Multinational companies in Michigan 468
- Multinational companies in Alabama 416
- Multinational companies in Virginia 396
- Multinational companies in Ohio 390
- Multinational companies in North Carolina 358
- Multinational companies in Washington State 288
- Multinational companies in Colorado 228
- Multinational companies in Minnesota 224
- Multinational companies in New York 1,836
- Multinational companies in San Francisco 446
- Multinational companies in Houston 402
- Multinational companies in Chicago 366
- Multinational companies in Miami 289
- Multinational companies in Atlanta 252