35 Largest Companies in Connecticut

Connecticut is home to a wide array of industries and businesses, with some of the largest companies in the state making a significant impact on the national and global economy.

From financial services to manufacturing and technology, these companies have established themselves as leaders in their respective fields.

The 35 largest companies in Connecticut encompass a diverse range of sectors, contributing to the state’s economic growth and employing thousands of residents.

These companies not only generate substantial revenue but also play a crucial role in driving innovation and creating job opportunities.

In this article, we will explore the top 35 companies that contribute to Connecticut’s economic prosperity and continue to make a significant impact on the business world.

Largest Companies in Connecticut

1. United Technologies Corporation (now part of Raytheon Technologies Corporation)

Background: United Technologies Corporation (UTC) was a multinational conglomerate headquartered in Farmington, Connecticut.

It was a leading provider of high-technology systems and services for the aerospace and building industries.

In April 2020, UTC completed its merger with Raytheon Company to form Raytheon Technologies Corporation, now headquartered in Waltham, Massachusetts.

Core Industries: Aerospace, defense, building technologies.

Key Achievements: UTC was known for its innovative contributions to the aerospace industry, including the development of aircraft engines, avionics systems, and other advanced technologies.

The company’s Pratt & Whitney division was a prominent manufacturer of aircraft engines, while its Collins Aerospace division provided a wide range of aerospace and defense products and services.

Additionally, UTC’s Otis division was a leading manufacturer of elevators and escalators, and its Carrier division specialized in HVAC and building automation solutions.

2. General Electric Company (GE)

Background: General Electric Company (GE) is a multinational conglomerate headquartered in Boston, Massachusetts, with significant operations in Connecticut.

Founded in 1892 by Thomas Edison, GE has been a pioneer in various industries, including aviation, healthcare, renewable energy, and power generation.

Core Industries: Aviation, healthcare, renewable energy, power generation.

Key Achievements: GE is known for its innovative products and services across multiple sectors.

In aviation, GE Aviation manufactures aircraft engines, providing power for a wide range of commercial and military aircraft.

GE Healthcare offers medical imaging, diagnostics, and biotechnology solutions, contributing to advancements in healthcare worldwide.

Additionally, GE Renewable Energy develops and supplies wind turbines, hydroelectric systems, and other renewable energy technologies, supporting the global transition to sustainable energy sources.

3. Aetna Inc. (part of CVS Health)

Background: Aetna Inc. is a managed healthcare company headquartered in Hartford, Connecticut.

Founded in 1853, Aetna has been a prominent player in the health insurance industry, offering a wide range of healthcare products and related services.

Core Industries: Health insurance, managed healthcare services.

Key Achievements: Aetna has played a significant role in providing access to healthcare services for millions of individuals and families across the United States.

The company’s insurance plans cover various medical expenses, including hospitalization, prescription drugs, and preventive care.

Aetna has also been involved in initiatives to improve healthcare outcomes and reduce healthcare costs through innovative programs and partnerships.

4. Cigna Corporation

Background: Cigna Corporation is a global health services company headquartered in Bloomfield, Connecticut.

Cigna was formed by the 1982 merger of the Connecticut General Life Insurance Company (CG) and INA Corporation.

With a history dating back to 1792, Cigna has evolved into a leading provider of healthcare, dental, disability, life, and accident insurance products.

Core Industries: Health insurance, healthcare services.

Key Achievements: Cigna’s comprehensive range of health services and insurance products has contributed to improving the health and well-being of individuals and communities worldwide.

The company’s focus on innovation and customer-centric solutions has enabled it to adapt to changing healthcare needs and emerging trends.

Additionally, Cigna’s commitment to corporate social responsibility includes initiatives to promote health equity, diversity, and environmental sustainability.

5. Xerox Corporation

Background: Xerox Corporation is a multinational corporation specializing in document technology and business services.

Headquartered in Norwalk, Connecticut, Xerox has been a pioneer in the development of photocopiers, printers, and related office equipment.

Core Industries: Document technology, business services.

Key Achievements: Xerox is renowned for its contributions to the evolution of document management and printing technologies.

The company’s innovations, such as the photocopier and laser printer, have revolutionized office workflows and communication processes.

Xerox’s focus on research and development continues to drive advancements in digital printing, document security, and workflow automation, helping organizations enhance productivity and efficiency.

Largest Companies in Connecticut

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6. Stanley Black & Decker

Background: Stanley Black & Decker is a global diversified industrial company headquartered in New Britain, Connecticut.

It is a leading manufacturer of hand tools, power tools, and related accessories, as well as security products and industrial solutions.

Core Industries: Hand tools, power tools, security products, industrial solutions.

Key Achievements: Stanley Black & Decker’s brands, including Stanley, DeWalt, and Craftsman, are widely recognized for their quality and reliability.

The company’s innovative tools and solutions serve professionals and consumers in construction, manufacturing, and various other industries.

Stanley Black & Decker’s commitment to sustainability and corporate social responsibility is reflected in its efforts to reduce environmental impact and support community development initiatives.

7. The Hartford Financial Services Group

Background: The Hartford Financial Services Group, commonly known as The Hartford, is a financial services company headquartered in Hartford, Connecticut.

It offers a wide range of insurance and investment products to individuals, businesses, and institutions.

Core Industries: Insurance, financial services.

Key Achievements: The Hartford has a long history of providing insurance solutions and financial protection to its customers.

The company’s insurance offerings include property and casualty insurance, group benefits, and mutual funds.

Hartford is recognized for its customer-centric approach, financial stability, and commitment to risk management.

Additionally, Hartford is actively involved in corporate social responsibility initiatives, supporting communities and promoting environmental sustainability.

8. Frontier Communications Corporation

Background: Frontier Communications Corporation is a telecommunications company headquartered in Norwalk, Connecticut.

It provides internet, phone, and television services to residential and business customers in various regions across the United States.

Core Industries: Telecommunications, internet services.

Key Achievements: Frontier Communications plays a vital role in connecting communities and businesses through its telecommunications infrastructure and services.

The company’s high-speed internet offerings enable individuals and organizations to access digital content, communicate online, and conduct business transactions.

Frontier Communications’ commitment to customer satisfaction and network reliability is reflected in its efforts to expand coverage and improve service quality.

9. Praxair, Inc. (now part of Linde plc)

Background: Praxair, Inc. was a multinational industrial gases company headquartered in Danbury, Connecticut. It was acquired by Linde plc in 2018 to create the largest industrial gases company in the world.

Core Industries: Industrial gases, atmospheric gases, specialty gases.

Key Achievements: Praxair was a leading supplier of industrial gases and related equipment and services, serving customers in a wide range of industries, including manufacturing, healthcare, and food processing.

The company’s gases, such as oxygen, nitrogen, and helium, are essential for various industrial processes, including welding, cutting, and freezing.

Praxair’s focus on innovation and sustainability contributed to its reputation as a trusted partner for customers seeking efficient and environmentally responsible solutions.

10. Eversource Energy

Background: Eversource Energy is a public utility holding company headquartered in Hartford, Connecticut.

It is engaged in the generation, transmission, and distribution of electricity and natural gas in Connecticut, Massachusetts, and New Hampshire.

Core Industries: Electric utilities, natural gas utilities.

Key Achievements: Eversource Energy plays a critical role in providing reliable and affordable energy services to millions of customers in the Northeastern United States.

The company’s investments in renewable energy and grid modernization support the transition to a cleaner and more sustainable energy future.

Eversource Energy’s commitment to safety, environmental stewardship, and customer satisfaction is reflected in its efforts to maintain a resilient energy infrastructure and enhance service reliability.

11. Pitney Bowes Inc.

Background: Pitney Bowes Inc. is a technology company headquartered in Stamford, Connecticut. It specializes in global e-commerce, shipping, mailing, and data solutions for businesses of all sizes.

Core Industries: Mailing equipment, shipping solutions, e-commerce technology.

Key Achievements: Pitney Bowes has been a leader in providing innovative solutions to streamline and simplify business communications and shipping processes.

The company’s postage meters, mailing software, and shipping services help businesses manage their outgoing mail and parcels efficiently.

Pitney Bowes also offers data management and analytics solutions to help businesses gain insights into customer behavior and improve decision-making.

12. Charter Communications

Background: Charter Communications is a telecommunications and mass media company headquartered in Stamford, Connecticut. It is one of the largest cable television and internet service providers in the United States.

Core Industries: Cable television, internet services, telecommunications.

Key Achievements: Charter Communications’ advanced broadband network infrastructure delivers high-speed internet, digital television, and voice services to residential and business customers.

The company’s commitment to innovation and customer satisfaction has enabled it to expand its service offerings and reach new markets.

Charter Communications’ investments in network upgrades and technology enhancements support the growing demand for digital connectivity and entertainment options.

13. Hartford HealthCare

Background: Hartford HealthCare is a regional healthcare system headquartered in Hartford, Connecticut. It operates hospitals, medical centers, and other healthcare facilities across Connecticut.

Core Industries: Healthcare, hospital management.

Key Achievements: Hartford HealthCare is committed to providing high-quality, patient-centered care to individuals and families throughout the region.

The healthcare system offers a comprehensive range of medical services, including primary care, specialty care, and advanced treatments for complex conditions.

Hartford HealthCare’s focus on innovation, research, and community outreach helps improve health outcomes and promote wellness initiatives.

14. Synchrony Financial

Background: Synchrony Financial is a consumer financial services company headquartered in Stamford, Connecticut.

It specializes in providing private label credit cards, retail banking, and financing solutions for consumers and businesses.

Core Industries: Consumer financial services, retail banking, credit cards.

Key Achievements: Synchrony Financial is known for its partnerships with leading retailers and brands to offer customized financing options and loyalty programs to customers.

The company’s digital banking solutions and mobile apps provide convenient access to account information and payment services.

Synchrony Financial’s focus on customer satisfaction, financial stability, and responsible lending practices has earned it recognition as a trusted provider of consumer credit solutions.

15. WWE (World Wrestling Entertainment)

Background: WWE (World Wrestling Entertainment) is a media and entertainment company headquartered in Stamford, Connecticut.

It is known for its professional wrestling events, television programming, and digital content distribution.

Core Industries: Sports entertainment, television production, digital media.

Key Achievements: WWE is a global leader in sports entertainment, with a loyal fan base and a diverse portfolio of programming and content offerings.

The company’s flagship events, such as WrestleMania and SummerSlam, attract millions of viewers worldwide and generate significant revenue through ticket sales, merchandise, and media rights deals.

WWE’s digital platforms, including the WWE Network streaming service, provide fans with access to a vast library of wrestling content and original programming.

16. Alexion Pharmaceuticals, Inc.

Background: Alexion Pharmaceuticals, Inc. is a biopharmaceutical company headquartered in New Haven, Connecticut. It focuses on the development and commercialization of therapies for rare diseases.

Core Industries: Biopharmaceuticals, rare diseases.

Key Achievements: Alexion Pharmaceuticals is known for its innovative treatments for rare and life-threatening diseases, including paroxysmal nocturnal hemoglobinuria (PNH) and atypical hemolytic uremic syndrome (aHUS).

The company’s products have significantly improved the lives of patients with rare disorders by addressing unmet medical needs and providing effective therapies.

Alexion Pharmaceuticals’ commitment to research and development, as well as patient advocacy, has positioned it as a leader in the field of rare disease therapeutics.

17. United Rentals, Inc.

Background: United Rentals, Inc. is the largest equipment rental company in the world, with its headquarters in Stamford, Connecticut.

It provides rental equipment and services to construction, industrial, and commercial customers.

Core Industries: Equipment rental, construction services, industrial solutions.

Key Achievements: United Rentals’ extensive fleet of equipment, including aerial lifts, earthmoving machinery, and power tools, enables customers to access the equipment they need to complete projects efficiently and safely.

The company’s rental solutions support a wide range of industries, including construction, infrastructure development, and manufacturing.

United Rentals’ focus on customer service, equipment reliability, and safety training has made it a trusted partner for contractors and businesses across various sectors.

18. Priceline.com (now Booking Holdings)

Background: Priceline.com was an online travel agency headquartered in Norwalk, Connecticut.

It was acquired by Booking Holdings Inc. (formerly known as The Priceline Group Inc.) and operates as part of the Booking.com brand.

Core Industries: Online travel agency, hotel booking, travel services.

Key Achievements: Priceline.com revolutionized the travel industry by offering a platform for consumers to search for and book flights, hotels, rental cars, and vacation packages at discounted prices.

The company’s “Name Your Own Price” feature allowed customers to bid on travel accommodations, resulting in significant savings and flexibility.

Priceline.com’s acquisition by Booking Holdings expanded its global reach and product offerings, further solidifying its position as a leading online travel agency.

19. Gartner, Inc.

Background: Gartner, Inc. is a global research and advisory firm headquartered in Stamford, Connecticut.

It provides insights, analysis, and advisory services to help organizations make informed decisions in various areas, including information technology, finance, and human resources.

Core Industries: Research, advisory services, consulting.

Key Achievements: Gartner’s research and advisory services are highly regarded by businesses and government agencies worldwide for their depth and accuracy.

The company’s expert analysts and consultants offer strategic guidance and actionable insights to help organizations navigate complex challenges and capitalize on emerging opportunities.

Gartner’s commitment to thought leadership, innovation, and client satisfaction has earned it a reputation as a trusted partner for business and technology leaders seeking to achieve their goals.

20. Terex Corporation

Background: Terex Corporation is a global manufacturer of lifting and material processing products headquartered in Westport, Connecticut.

It serves customers in the construction, infrastructure, quarrying, mining, and transportation industries.

Core Industries: Lifting equipment, material processing, construction machinery.

Key Achievements: Terex Corporation’s portfolio of brands, including Terex Cranes, Terex Utilities, and Terex Materials Processing, offers a wide range of solutions for lifting, material handling, and processing applications.

The company’s innovative products, such as cranes, aerial work platforms, and crushing and screening equipment, are used in various construction and industrial projects worldwide.

Terex Corporation’s commitment to quality, safety, and customer satisfaction has made it a trusted partner for contractors, rental companies, and equipment operators.

26. UIL Holdings Corporation (part of Avangrid, Inc.)

Background: UIL Holdings Corporation was a public utility holding company headquartered in New Haven, Connecticut.

It was acquired by Avangrid, Inc., a subsidiary of Iberdrola, in 2015. Avangrid is a diversified energy and utility company with operations in the United States and Spain.

Core Industries: Electric utilities, natural gas utilities.

Key Achievements: UIL Holdings Corporation’s subsidiaries, including The United Illuminating Company and Connecticut Natural Gas Corporation, provided electric and natural gas services to customers in Connecticut.

The company’s focus on reliability, safety, and environmental stewardship helped maintain a resilient energy infrastructure and support sustainable development in the region.

27. Aquarion Water Company (part of Eversource Energy)

Background: Aquarion Water Company is a public water utility headquartered in Bridgeport, Connecticut. It was acquired by Eversource Energy in 2017.

Aquarion provides water services to customers in Connecticut, Massachusetts, and New Hampshire.

Core Industries: Water utilities, water supply services.

Key Achievements: Aquarion Water Company’s commitment to delivering high-quality drinking water and reliable service to its customers has earned it recognition as a leader in the water utility industry.

The company’s investments in water infrastructure upgrades, conservation initiatives, and water quality monitoring help ensure the availability of clean and safe drinking water for the communities served.

28. Purdue Pharma

Background: Purdue Pharma was a pharmaceutical company headquartered in Stamford, Connecticut. It was best known for its production of OxyContin, a prescription pain medication.

The company faced legal challenges and filed for bankruptcy in 2019.

Core Industries: Pharmaceuticals.

Key Achievements: Purdue Pharma’s development of OxyContin, a long-acting opioid pain reliever, was initially hailed as a breakthrough in pain management.

However, the widespread misuse and addiction to OxyContin led to legal controversies and public health concerns.

Purdue Pharma faced allegations of deceptive marketing practices and was accused of contributing to the opioid crisis in the United States.

29. Diageo North America

Background: Diageo North America is a subsidiary of Diageo plc, a British multinational alcoholic beverages company. It is headquartered in Norwalk, Connecticut, and is responsible for Diageo’s operations in North America.

Core Industries: Alcoholic beverages.

Key Achievements: Diageo North America markets and distributes a diverse portfolio of premium spirits, including iconic brands such as Johnnie Walker, Smirnoff, Captain Morgan, and Guinness.

The company’s commitment to quality, innovation, and responsible drinking initiatives has made it a leading player in the alcoholic beverages industry.

Diageo North America’s brands are enjoyed by consumers around the world and contribute to memorable experiences and celebrations.

30. Otis Worldwide Corporation

Background: Otis Worldwide Corporation is a leading manufacturer of elevators and escalators, headquartered in Farmington, Connecticut.

It was formerly a subsidiary of United Technologies Corporation (UTC) before UTC’s merger with Raytheon Company to form Raytheon Technologies Corporation.

Core Industries: Elevator manufacturing, escalator manufacturing.

Key Achievements: Otis Worldwide Corporation’s elevators and escalators are installed in buildings and infrastructure projects worldwide, providing safe and efficient vertical transportation for passengers.

The company’s innovative products, such as the Gen2 elevator system and the ReGen drive technology, enhance energy efficiency and sustainability in urban environments.

Otis Worldwide Corporation’s commitment to safety, reliability, and customer satisfaction has made it a trusted partner for architects, developers, and building owners.

31. Harman International Industries (now a subsidiary of Samsung Electronics)

Background: Harman International Industries was a multinational electronics company headquartered in Stamford, Connecticut.

It was acquired by Samsung Electronics in 2017 and now operates as a subsidiary of Samsung.

Core Industries: Consumer electronics, audio equipment, automotive technology.

Key Achievements: Harman International Industries was known for its expertise in audio technology and its portfolio of brands, including JBL, Harman Kardon, and AKG.

The company’s audio systems were widely used in homes, automobiles, and professional settings, delivering high-quality sound experiences to consumers around the world.

Harman International’s integration into Samsung Electronics has expanded its global reach and capabilities in the consumer electronics and automotive sectors.

32. Affinion Group Holdings, Inc.

Background: Affinion Group Holdings, Inc. was a global loyalty and customer engagement company headquartered in Stamford, Connecticut.

It specialized in designing and managing customer loyalty programs for businesses in various industries.

Core Industries: Loyalty programs, customer engagement, marketing services.

Key Achievements: Affinion Group Holdings helped businesses build customer loyalty and increase engagement through personalized rewards, incentives, and promotional offers.

The company’s expertise in data analytics and customer segmentation allowed it to create targeted marketing campaigns that drove customer retention and satisfaction.

Affinion Group Holdings’ innovative loyalty solutions and technology platforms enabled businesses to strengthen their relationships with customers and drive revenue growth.

33. Bridgewater Associates

Background: Bridgewater Associates is an investment management firm headquartered in Westport, Connecticut.

It is one of the largest hedge fund companies in the world, known for its systematic and research-driven approach to investing.

Core Industries: Investment management, hedge funds.

Key Achievements: Bridgewater Associates’ investment strategies, including its flagship Pure Alpha fund, have generated consistent returns for its clients over the years.

The firm’s focus on data-driven analysis, risk management, and diversification has helped navigate volatile market conditions and deliver positive outcomes across various market cycles.

Bridgewater Associates’ commitment to transparency, integrity, and continuous learning has earned it a reputation as a thought leader in the investment management industry.

34. Nestlé Waters North America (part of Nestlé S.A.)

Background: Nestlé Waters North America is a subsidiary of Nestlé S.A., a multinational food and beverage company.

It is headquartered in Stamford, Connecticut, and is responsible for Nestlé’s bottled water business in North America.

Core Industries: Bottled water, beverages.

Key Achievements: Nestlé Waters North America offers a diverse portfolio of bottled water brands, including Poland Spring, Deer Park, Perrier, and San Pellegrino.

The company’s commitment to sustainability and environmental stewardship includes efforts to reduce plastic waste, improve water resource management, and promote recycling initiatives.

Nestlé Waters North America’s brands are trusted by consumers for their purity, quality, and convenience, contributing to hydration and wellness.

35. Webster Bank

Background: Webster Bank is a regional bank headquartered in Waterbury, Connecticut.

It provides banking, financial, and wealth management services to individuals, businesses, and institutions in the Northeastern United States.

Core Industries: Banking, financial services, wealth management.

Key Achievements: Webster Bank’s personalized approach to banking and wealth management has earned it a loyal customer base and a strong reputation for customer service.

The bank offers a range of products and services, including checking and savings accounts, loans, mortgages, and investment management solutions.

Webster Bank’s commitment to community engagement and corporate social responsibility is reflected in its support for local initiatives, charitable organizations, and economic development projects.

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In conclusion, the landscape of Connecticut’s economy is shaped significantly by its largest companies, spanning diverse sectors from finance and insurance to manufacturing and healthcare.

These enterprises not only contribute substantially to the state’s GDP but also play a crucial role in employment generation and community development.

Their presence underscores Connecticut’s position as a hub for innovation and commerce, highlighting the resilience and adaptability of its business environment.

As these companies continue to evolve and expand, they remain integral to driving economic growth and fostering prosperity across the state.

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