This selection of multinational companies in Connecticut showcases a diverse economic landscape, primarily featuring large corporations. Key players include The Cigna Group, a global health company, and Xerox, which provides innovative technology solutions for the workplace. XPO is a global transportation company, while Pratt & Whitney designs and manufactures advanced propulsion systems for aircraft. The Hartford offers insurance and protection services, and Yale University is a research institution.
A notable pattern among these companies is the concentration of headquarters in specific cities. For example, Norwalk hosts Xerox, Booking Holdings, and FactSet, while Stamford is home to HARMAN International, Gartner, and United Rentals. This indicates a clustering of significant corporate presence within a few urban centers in Connecticut.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
The Cigna Groupthecignagroup.com
Global health company offering insurance products and health services, partnering worldwide to improve individual and community vitality. |
50,174 | |||
| 2 | 47,247 | ||||
| 3 | 38,917 | ||||
| 4 |
GXO Logistics, Inc.gxo.com
Providing innovative opportunities in logistics through advanced automation, benefiting customers, employees, and investors alike |
36,174 | |||
| 5 |
Pratt & Whitneyrtx.com
Design and manufacture advanced propulsion systems for aircraft, enabling global connectivity, economic growth, and national defense. |
30,378 | |||
| 6 |
Cigna Healthcarecigna.com
Benefits provider, guides customers through healthcare system, empowering them with information and insight to improve health and vitality. |
29,662 | |||
| 7 |
Stanley Black & Decker, Inc.stanleyblackanddecker.com
Provider of tools, fasteners, and infrastructure systems supporting home repair, automotive security, construction, and energy industries with innovation and safety. |
29,460 | |||
| 8 |
HARMAN Internationalharman.com
Designs and manufactures premium audio products and automotive electronics, enabling smarter, safer, and immersive in-cabin vehicle experiences worldwide. |
27,936 | |||
| 9 |
SS&C Technologiesssctech.com
Provider of cloud-based software and solutions for financial and healthcare industries, serving over 22,000 companies globally. |
27,478 | |||
| 10 |
Gartnergartner.com
A global company providing expert-led research and data-driven insights to help executives make faster, smarter decisions and achieve stronger performance |
22,206 | |||
| 11 |
The Hartfordthehartford.com
The company goes beyond providing insurance to protect individuals and businesses, making an impact through human achievement and comprehensive protection |
21,627 | |||
| 12 |
Yale Universitynews.yale.edu
Research university fostering global connections, creativity, and innovation, emphasizing student learning and positive worldwide impact. |
19,675 | |||
| 13 |
Booking Holdings (NASDAQ: BKNG)bookingholdings.com
Global provider of online travel & related services, offering booking options in over 220 countries through multiple brands, operating in 40+ languages worldwide |
18,737 | |||
| 14 |
United Rentalsunitedrentals.com
Largest equipment rental company providing construction, industrial, and specialty solutions with extensive fleet, safety training, and 24/7 support. |
16,511 | |||
| 15 |
FactSetfactset.com
Open financial data and software solutions for investment professionals worldwide providing access to analytics for crucial decision making and consistent client service. |
15,211 | |||
| 16 |
Pitney Bowespitneybowes.com
Provides digital shipping solutions, mailing innovation, and financial services to businesses and government entities worldwide, simplifying mail and parcel sending. |
12,611 | |||
| 17 |
ESPNjobs.disneycareers.com
Leading multinational sports entertainment company with a wide range of multimedia assets including TV networks, radio, online platforms, magazines, and sports-themed restaurants |
11,732 | |||
| 18 |
GeBBS Healthcare Solutionsgebbs.com
A leading provider of Revenue Cycle Management services and Risk Adjustment solutions, utilizing innovative technology and a global workforce to improve financial performance for clients |
11,612 | |||
| 19 |
SHRW, LLCmarriott.com
Branding and hotel management company overseeing 1 Hotels and Homes, Baccarat Hotels and Residences, and Treehouse Hotels after its relaunch in 2025. |
10,128 | |||
| 20 | 9,330 | ||||
| 21 |
Terex Corporationterex.com
A global manufacturing company focused on building essential machines, improving lives, volunteering, and maintaining a safe, inclusive work environment |
8,109 | |||
| 22 |
GE Capitalgecapital.com
Provides financial solutions to support global infrastructure, partnering with industries to build, move, power, and cure the world, bridging industry and finance. |
13,000 | |||
| 23 |
Hubbell Incorporatedhubbell.com
Manufacturer of utility and electrical solutions focused on grid modernization, clean energy, electrification, and energy efficiency worldwide. |
7,655 | |||
| 24 |
TRC Companies, Inc.trccompanies.com
Providing advisory, consulting, construction, engineering, and management services to help clients adapt and achieve sustainable, impactful results. |
7,463 | |||
| 25 |
Praxair, Inc - a Linde Companylindeus.com
A global leader in industrial gases and engineering, providing high-quality gases, technologies, and services to diverse markets while promoting sustainability and productivity |
6,549 | |||
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 |
PerkinElmerperkinelmer.com
A global provider of technology and service solutions for measuring, quantifying, detecting, and reporting in various industries to ensure quality and safety |
6,485 | |||
| 27 |
Tronoxtronox.com
A global producer of titanium dioxide and inorganic chemicals, specializing in mining, processing, and manufacturing products for various industries worldwide |
5,877 | |||
| 28 |
Sikorskylockheedmartin.com
A global leader in helicopter technology, providing innovative and safe flight solutions for commercial and military markets worldwide since 1939 |
5,753 | |||
| 29 |
Amphenolamphenol.com
A Fortune 500 manufacturer with 90,000 employees worldwide, providing key components for electronic devices and networks in daily use |
5,559 | |||
| 30 |
LAZ Parkinglazparking.com
A parking management service provider with a people-focused philosophy, offering services in various markets across thousands of locations in the US |
5,078 | |||
| 31 |
Dynatadynata.com
Global leader in first-party data for insights, activation, and measurement, serving thousands of clients worldwide with trustworthy, precise data solutions for marketing needs |
4,715 | |||
| 32 |
Crane Companycraneco.com
Long-standing ethical business focused on innovation, disciplined management, strategic acquisitions, and creating value for customers, suppliers, and shareholders. |
4,696 | |||
| 33 |
IMS Healthiqvia.com
Provides healthcare data, analytics, and technology solutions to improve clinical, commercial, and real-world outcomes in the life sciences industry. |
4,675 | |||
| 34 |
Moheganmohegangaming.com
This company owns, develops, and manages entertainment resorts and provides online gaming solutions, with operations in the US, Canada, and South Korea |
3,962 | |||
| 35 |
Electronic Data Systemsdxc.com
A global company founded in 1962 offering electronic data processing management personnel and computer hardware, focusing on large corporations and government contracts |
3,809 | |||
| 36 |
Point72point72.com
Global alternative investment firm focusing on fundamental and systematic strategies across asset classes and geographies to deliver superior returns. |
3,559 | |||
| 37 |
Interactive Brokersinteractivebrokers.com
Provides automated trade execution and custody for diverse financial instruments across global markets, offering advanced tools and research at low cost. |
3,506 | |||
| 38 |
Sacred Heart Universitysacredheart.edu
A Catholic university focused on liberal arts and intellectual traditions, promoting diversity, integrity, leadership, and service for students, faculty, and staff |
3,411 | |||
| 39 |
Hexcel Corporationhexcel.com
Production of carbon fiber reinforcements, resin systems, and honeycomb materials focused on lightweight solutions for commercial aerospace industry. |
3,357 | |||
| 40 |
Edgewell Personal Careedgewell.com
Global personal care company with 25+ brands, serving 50+ countries, focusing on efficiency, sustainability, and inclusive workplace culture. |
3,354 | |||
| 41 |
Amphenol Communications Solutionsamphenol-cs.com
Design and manufacture innovative connectors and cable assemblies for communications, mobile, RF, optics, data centers, networking, industrial, and automotive applications. |
3,169 | |||
| 42 |
Legrand, North Americalegrand.us
Specialist in electrical and digital building infrastructures serving residential and non-residential markets across North and Central America. |
3,125 | |||
| 43 |
DST Systemsssctech.com
A global fintech company offering specialized software solutions and services for insurance, asset management, and other financial industries, with a focus on operational excellence |
3,116 | |||
| 44 |
Centerplatesodexolive.us
Providing food and beverage services, hospitality, and event management solutions for sports venues, entertainment arenas, and convention centers. |
2,953 | |||
| 45 |
OP360 (OfficePartners360)op360.com
Global workforce partner offering streamlined outsourcing solutions for brands, delivering omnichannel customer service, sales, technology support, and back-office services to medium and Fortune 500 companies |
2,785 | |||
| 46 |
Ethan Allen Global, Inc.ethanallen.com
Innovative furniture retailer with a wide range of styles, offering customization options and environmentally sustainable products, emphasizing excellent service and community involvement |
2,765 | |||
| 47 |
WorldQuantworldquant.com
Global quantitative asset management firm developing and deploying investment strategies across diverse asset classes in international markets through a large network of offices. |
2,731 | |||
| 48 |
United Technologiesrtx.com
Merger of aerospace and defense companies combining advanced technology and innovation to provide integrated solutions for global security and aviation. |
2,724 | |||
| 49 |
Mohegan Sunmohegansun.com
A destination offering entertainment, gaming, dining, shopping, luxury hotel, spa, golf, shops, restaurants, bars, and entertainment venues in southeastern Connecticut |
2,661 | |||
| 50 |
University of New Havennewhaven.edu
Private coeducational university founded in 1920 on the Yale campus Recognized for academic excellence, located in West Haven, with over 9,800 global students |
2,648 | |||
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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 Connecticut
- The largest companies in Connecticut 1,247
- Financial services firms in Connecticut 172
- Manufacturers in Connecticut 143
- Companies with in-house R&D in Connecticut 101
- Education providers in Connecticut 92
- Financial Services companies in Connecticut 92
- Hardware manufacturers in Connecticut 86
- Critical infrastructure operators in Connecticut 85
- Healthcare providers in Connecticut 79
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- Retail chains in Connecticut 72
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- Contract manufacturers in Connecticut 44
- SaaS companies in Connecticut 44
- Companies with a mobile app in Connecticut 43
- Higher Education companies in Connecticut 43
- Public sector organisations in Connecticut 42
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 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
- Multinational companies in Boston 241