
Above: A Pratt & Whitney employee works on a PW110G-JM engine at the company's location in Middletown, CT. Pratt & Whitney, Middletown, is Connecticut's sixth-largest industrial employer (Image Source: Pratt & Whitney Middletown)
The state of Connecticut boasts a diverse manufacturing sector, making everything from high-tech aeronautics equipment and medical devices to semiconductor components and pharmaceuticals. With its highly educated workforce and focus on advanced manufacturing, Connecticut remains a top destination for high-tech and innovative enterprises.
Today, we’re exploring some of the key facts on the state’s unique industrial sector and examining Connecticut’s ten largest manufacturing companies, based on data collected by MNI.
Looking for industrial sales leads in Connecticut? Reach 3,900+ Connecticut industrial companies and their 9,700+ executives with the Connecticut Manufacturing Industry Database, only from MNI.
The Latest Facts on Connecticut’s Manufacturing Sector
According to MNI, compiler of the industrial information that powers IndustrySelect, Connecticut is currently home to 3,881 manufacturers employing 189,306 workers.
Groton is Connecticut’s largest city based on number of industrial jobs, with 12,780 workers.
Other top cities in Connecticut include
- Stratford (9,909 jobs)
- North Haven (7,347 jobs)
- Bristol (6,598 jobs)
- Stamford (6,358 jobs)
Read more: Top Manufacturing Cities in the U.S.
Hartford County is Connecticut’s largest in terms of industrial jobs, home to 73,274 workers. This is followed by Fairfield with 56,934 workers, New Haven (50,454 jobs), New London (12,608 jobs) and Middlesex (12,155 jobs).
The transportation equipment industry is Connecticut’s largest measured by number of jobs. The transportation equipment sector accounts for 18% of the state’s industrial workforce, followed by fabricated metal products and industrial machinery, each accounting for 13%. Instrument and related products account for 9% of Connecticut’s manufacturing workforce, along with printing and publishing with 9%.
Read more: Top 10 Manufacturing States in the U.S.
MNI reports there are 14,856 executive contacts among Connecticut’s manufacturing companies, including 2,410 presidents, 1,423 owners and partners; 1,463 vice-presidents and 1,495 sales, marketing and purchasing executives.
Other facts to know about Connecticut manufacturers, based on IndustrySelect’s advanced criteria available to subscribers, include ownership, distribution and other trends. Let’s take a look:
- 2% of Connecticut manufacturers are women-owned
- 1% are minority-owned
- 7% are publicly owned companies
- 13% import raw materials
- 33% distribute their products internationally.
Next, we’ll take a look at the state’s top companies.
Top 10 Manufacturing Companies in Connecticut
| Company | Employees | City | State |
|---|---|---|---|
| Electric Boat Corp. | 12,000 | Groton | CT |
| Sikorsky, A Lockheed Martin Co. | 7,500 | Stratford | CT |
| Rockwell Collins, Inc. | 4,000 | Windsor Locks | CT |
| Medtronic, Inc. | 3,000 | North Haven | CT |
| Boehringer Ingelheim Pharmaceuticals, Inc. | 2,700 | Ridgefield | CT |
| Pratt & Whitney Engine Services, Inc. | 2,300 | Middletown | CT |
| Medtronic, Inc. | 2,200 | North Haven | CT |
| The Pratt & Whitney Co., Inc. | 2,000 | East Hartford | CT |
| ASML US, Inc. | 1,600 | Wilton | CT |
| Kaman Corp. | 1,000 | Bloomfield | CT |
About the Top 10 Manufacturing Companies in Connecticut
1. Electric Boat Corp. (Groton, CT)
Employing 12,000 in Groton, Electric Boat Corp., a General Dynamics company, is Connecticut’s largest industrial employer. Established in 1899, Electric Boat is a major defense firm specializing in the design and production of submarines for the U.S. navy, as well as providing submarine lifecycle support.
2. Sikorsky, A Lockheed Martin Co. (Stratford, CT)
Employing 7,500 employees, Sikorsky’s massive Stratford campus operates as the company’s headquarters and is Connecticut’s third-largest manufacturer measured by number of jobs. Established in 1923, This location boasts more than $7.4 billion in annual sales and produces military and commercial helicopters as well as reconnaissance aircraft, spare parts, maintenance and repair and more
3. Rockwell Collins, Inc. (Windsor, CT)
Ranking fourth in the state, this Collins Aerospace Systems location in Windsor employs 4,000 and brings in roughly $5 billion in annual sales. A subsidiary of RTX Corporation, the company produces aerospace and industrial components from this 2 million square-foot facility.
4. Medtronic (North Haven, CT)
Medtronic started out as a medical equipment repair facility, founded in Minneapolis in 1949, and today is a global medical device leader with locations in 140 countries. The largest of New Haven’s two Medtronic facilities, this location on McDermott Road employs 3,000 and specializes in surgical spray adhesion barriers and suture sealants.
5. Boehringer Ingelheim Pharmaceuticals (Ridgefield, CT)
Founded in Germany in 1885, Boehringer Ingelheim Pharmaceuticals is a world leader in pharmaceutical research and production. The company’s Ridgefield location was established in 1971 and operates as the company’s U.S. headquarters, focusing on immune modulation and NBE discovery, cardiometabolic diseases and more.
6. Pratt & Whitney (Middletown, CT)
The smaller of Pratt & Whitney’s two Connecticut locations, the Middletown facility employs 2,300 and produces aircraft engines.
7. Medtronic (North Haven, CT)
North Haven’s second Medtronic facility on Middletown Avenue produces laparoscopic and arthroscopic surgical stapling as well as suture products. Established in 1964, this facility encompasses 200,000 square feet and employs 2,200.
8. The Pratt & Whitney Co., Inc. (East Hartford, CT)
A subsidiary of Raytheon, Pratt & Whitney is a global supplier of defense aircraft, employing 12,110 throughout the U.S.. With annual sales of more than $100 million, the East Hartford location functions as the company’s divisional headquarters and produces jet engines.
9. ASML US, Inc. (Wilton, CT)
Established in 1985, ASML U.S., Inc. produces lithography systems for the semiconductor industry, employing 1,600 in Wilton. The company has multiple locations throughout the U.S. and its Wilton location is one of three main manufacturing tech hubs, producing water alignment sensors and DUV/EUV lithography sub-systems.
10. Kaman Corporation (Bloomfield, CT)
Kaman Corporation, headquartered in Bloomfield, develops and manufactures highly engineered components, subsystems, and systems for the aerospace and defense industries. The company specializes in precision bearings, aircraft components, fuzing and safe-and-arm technologies, and other mission-critical products used in military, commercial aerospace, and industrial applications. With a long history of engineering innovation and advanced manufacturing, Kaman serves customers worldwide by providing high-performance solutions for demanding environments.
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Sources
https://www.mni.net
Editor's Note: This article was originall published in June 2021. It is updated annually to reflect new statistics on Connecticut's manufacturing sector.

