# Top 30 companies with in-house R&D in Boston

Tamtam tracks 88 companies with in-house R&D headquartered in Boston. This list ranks the 30 largest by number of employees on LinkedIn, led by GE, GE Vernova and Publicis Sapient. Their median headcount is 5,812. Half of them were founded in 1992 or later.

These companies are the largest with in-house R&D in Boston. They represent a mix of established large enterprises and significant mid-sized firms. The selection includes GE, focused on aviation and energy, and Publicis Sapient, a digital business transformation partner. Healthcare is strongly represented by Massachusetts General Hospital and Boston Children's Hospital, while Wayfair operates in retail, and athenahealth offers IT solutions for healthcare.

A notable pattern among these companies is the strong presence of the healthcare and higher education sectors. Massachusetts General Hospital, Boston Children's Hospital, Dana-Farber Cancer Institute, Harvard Business School, and Harvard Medical School illustrate Boston's concentration of institutions dedicated to health and learning, many with long histories, such as Massachusetts General Hospital founded in 1811.

🇺🇸 Boston · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [GE](https://www.tamtam.ai/c/ge) (ge.com)<br>Focus on advancing aviation and energy industries through innovative technologies and solutions shared via specialized aerospace and energy platforms. | Industrial Machinery Manufacturing | 🇺🇸 Boston | 99,488 |  |
| 2 | [GE Vernova](https://www.tamtam.ai/c/ge-vernova) (linktr.ee)<br>A purpose-built company focused on electrifying the planet and decarbonizing it through a diverse portfolio of energy businesses, ensuring reliable and sustainable energy | Energy Technology | 🇺🇸 Boston | 70,646 |  |
| 3 | [Publicis Sapient](https://www.tamtam.ai/c/publicis-sapient) (publicissapient.com)<br>A digital business transformation partner, specializing in strategy, product, experience, engineering, data, and delivering impactful solutions to global organizations | Business Consulting and Services | 🇺🇸 Boston | 24,251 |  |
| 4 | [Massachusetts General Hospital](https://www.tamtam.ai/c/massachusetts-general-hospital) (massgeneral.org)<br>Dedicated to providing top-notch healthcare in a compassionate environment through innovative research and education, improving health in diverse communities served | Hospitals and Health Care | 🇺🇸 Boston | 20,001 | 1811 |
| 5 | [Boston Children's Hospital](https://www.tamtam.ai/c/boston-children-s-hospital) (childrenshospital.org)<br>A leading pediatric medical center providing comprehensive healthcare services for children from birth to 21 years, with specialized clinical programs and renowned physicians | Hospitals and Health Care | 🇺🇸 Boston | 17,496 | 1869 |
| 6 | [Wayfair](https://www.tamtam.ai/c/wayfair) (aboutwayfair.com)<br>Destination for all things home, offering expert customer service, tools for easy shopping, and wide selection to help create personalized spaces | Retail | 🇺🇸 Boston | 12,524 | 2002 |
| 7 | [Harvard Business School](https://www.tamtam.ai/c/harvard-business-school) (hbs.edu)<br>Offers MBA, PhD, executive education, and online programs focused on leadership development, business practice, and entrepreneurship worldwide. | Higher Education | 🇺🇸 Boston | 12,457 | 1908 |
| 8 | [Harvard Medical School](https://www.tamtam.ai/c/harvard-medical-school) (hms.harvard.edu)<br>A prestigious medical school fostering a diverse community of leaders dedicated to advancing knowledge, education, and research to alleviate human suffering | Higher Education | 🇺🇸 Boston | 12,076 |  |
| 9 | [Dana-Farber Cancer Institute](https://www.tamtam.ai/c/dana-farber-cancer-institute) (dana-farber.org)<br>Providing expert, compassionate care to children and adults with cancer while advancing understanding, treatment, cure, and prevention. | Hospitals and Health Care | 🇺🇸 Boston | 8,981 | 1947 |
| 10 | [athenahealth](https://www.tamtam.ai/c/athenahealth) (athenahealth.com)<br>The company strives to simplify healthcare with innovative technology for electronic health records, revenue cycle management, and patient engagement solutions | IT Services and IT Consulting | 🇺🇸 Boston | 8,956 | 1997 |
| 11 | [PTC](https://www.tamtam.ai/c/ptc) (ptc.com)<br>It provides solutions for manufacturers to enhance product differentiation, operational excellence, and workforce productivity through digital transformation and technology. | Software Development | 🇺🇸 Boston | 8,184 |  |
| 12 | [Toast](https://www.tamtam.ai/c/toast-boston) (pos.toasttab.com)<br>Toast empowers restaurants with cloud-based software and hardware to streamline operations, drive revenue, and enhance guest experience through POS, marketing, and HR solutions | Software Development | 🇺🇸 Boston | 7,762 | 2011 |
| 13 | [Vertex Pharmaceuticals](https://www.tamtam.ai/c/vertex-pharmaceuticals) (vrtx.com)<br>Global biotechnology company focusing on creating medicines for serious and life-threatening diseases, with a pioneering history in treating cystic fibrosis | Biotechnology Research | 🇺🇸 Boston | 6,382 | 1989 |
| 14 | [Dynatrace](https://www.tamtam.ai/c/dynatrace) (dynatrace.com)<br>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 | Software Development | 🇺🇸 Boston | 6,090 |  |
| 15 | [Veolia \| North America](https://www.tamtam.ai/c/veolia-north-america) (veolianorthamerica.com)<br>Provides resource management solutions including water decontamination, toxic waste handling, fossil fuel alternatives, wastewater reuse, and battery recycling for cities and industries. | Environmental Services | 🇺🇸 Boston | 5,812 |  |
| 16 | [DraftKings Inc.](https://www.tamtam.ai/c/draftkings-inc) (careers.draftkings.com)<br>The company is committed to creating popular games and betting experiences, leading the way in sports entertainment, innovation, and global collaboration | Mobile Gaming Apps | 🇺🇸 Boston | 5,760 | 2012 |
| 17 | [Alexion Pharmaceuticals, Inc.](https://www.tamtam.ai/c/alexion-pharmaceuticals-inc) (alexion.com)<br>Development of innovative medicines targeting rare diseases, focusing on complement system biology, expanding global reach to serve patients worldwide. | Biotechnology Research | 🇺🇸 Boston | 5,112 | 1992 |
| 18 | [Cabot Corporation](https://www.tamtam.ai/c/cabot-corporation) (cabotcorp.com)<br>Global specialty chemical and performance materials company providing solutions to address current challenges and future customer needs worldwide. | Chemical Manufacturing | 🇺🇸 Boston | 3,719 | 1882 |
| 19 | [University of Massachusetts](https://www.tamtam.ai/c/university-of-massachusetts) (youtube.com)<br>Public university system offering high-quality education, conducting extensive research, and providing impactful public service to communities locally and globally. | Higher Education | 🇺🇸 Boston | 3,476 | 1863 |
| 20 | [Rapid7](https://www.tamtam.ai/c/rapid7) (rapid7.com)<br>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. | Computer and Network Security | 🇺🇸 Boston | 3,268 |  |
| 21 | [Suffolk Construction](https://www.tamtam.ai/c/suffolk-construction) (suffolk.com)<br>National construction management firm providing real estate investment, design, self-perform construction, technology investment, and innovation research services across multiple industries. | Construction | 🇺🇸 Boston | 2,923 | 1982 |
| 22 | [Klaviyo](https://www.tamtam.ai/c/klaviyo) (klaviyo.com)<br>Unified customer platform empowering brands with ownership of consumer data to automate personalized email/SMS communications, foster customer relationships, and drive growth | Marketing Services | 🇺🇸 Boston | 2,902 | 2012 |
| 23 | [Spaulding Rehabilitation Hospital](https://www.tamtam.ai/c/spaulding-rehabilitation-hospital) (spauldingrehab.org)<br>A leading rehabilitation facility providing comprehensive treatment, part of a network with specialty hospitals, skilled nursing facilities, and outpatient centers in Eastern Massachusetts | Hospitals and Health Care | 🇺🇸 Boston | 2,441 | 1971 |
| 24 | [Semrush](https://www.tamtam.ai/c/semrush) (semrush.com)<br>A leading online visibility management platform offering a suite of marketing tools to help companies improve their online presence and results | Software Development | 🇺🇸 Boston | 2,357 | 2008 |
| 25 | [argenx](https://www.tamtam.ai/c/argenx) (argenx.com)<br>Global immunology company focused on developing novel antibody-based medicines for severe autoimmune diseases through collaborations with leading researchers | Biotechnology Research | 🇺🇸 Boston | 2,315 | 2008 |
| 26 | [Curium Pharma](https://www.tamtam.ai/c/curium-pharma) (curiumpharma.com)<br>Global leader in nuclear medicine, providing life-changing diagnostics and treatment for cancer patients worldwide through innovative radiopharmaceutical products and AI-driven solutions | Pharmaceutical Manufacturing | 🇺🇸 Boston | 2,236 | 2017 |
| 27 | [OutSystems](https://www.tamtam.ai/c/outsystems) (outsystems.com)<br>Provides an AI development platform for enterprises to rapidly build custom applications and AI agents while modernizing legacy core business systems. | Software Development | 🇺🇸 Boston | 2,228 | 2001 |
| 28 | [Perk](https://www.tamtam.ai/c/perk) (perk.com)<br>A hyper-growth SaaS business travel platform revolutionizing business travel with an all-in-one solution for companies and organizations worldwide | Technology, Information and Internet | 🇺🇸 Boston | 2,228 | 2015 |
| 29 | [InterSystems](https://www.tamtam.ai/c/intersystems) (intersystems.com)<br>InterSystems provides data platforms and connected care solutions for healthcare, business, and government to drive better decisions and outcomes worldwide | Software Development | 🇺🇸 Boston | 2,127 | 1978 |
| 30 | [BCG X](https://www.tamtam.ai/c/bcg-x) (bcg.com)<br>Builds and designs platforms and software with advanced tech knowledge and entrepreneurship to enable innovation and address challenges for organizations. | Technology, Information and Internet | 🇺🇸 Boston | 2,033 |  |

## 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.

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Source: https://www.tamtam.ai/l/r-and-d-companies-boston