Pharmaceutical companies in Connecticut: a research state with only 19 drug plants

This page is for job seekers, partners and sellers looking for drug companies in Connecticut. Because the state has so few drug plants, it starts with that count and its limits, then moves to where the industry actually employs people.

Too few plants to tell the story

County Business Patterns (CBP) 2023, NAICS 3254 (Pharmaceutical and Medicine Manufacturing):

Seven of the 19 have 1 to 4 employees, 3 have 50 to 99 and 3 have 100 to 249; the Census Bureau doesn't publish the other size classes, which hold 6 establishments between them (our subtraction). Fifteen make finished-dose pharmaceuticals (325412) with 859 employees. With so few sites, a single plant opening or closing moves the totals, so the high average pay says more about the mix of a few sites than about typical wages.

The 2023 Census file reports Connecticut by its nine planning regions rather than its old eight counties. Only three regions have enough plants to publish: Capitol (6 establishments, employee total not reported because it's a high-noise figure), Lower Connecticut River Valley (4, with 225 employees) and South Central (4, high-noise). "High-noise" means the Census Bureau's confidentiality noise changed the value by 5% or more.

As everywhere in CBP, these are locations with paid employees, not companies, and the self-employed aren't counted. Code 3254 covers manufacturing sites only, so research labs, head offices and distributors are all counted elsewhere. For a fuller regional picture, the New Jersey pharmaceutical market report and the Massachusetts report cover the neighboring states with large plant bases.

Where the jobs really are: research

Statewide, code 541715 had 156 establishments and 11,840 employees, and code 541714 had 97 establishments and 2,315 employees. One caution: 541715 includes R&D in engineering, electronics and other sciences as well as medicine and pharmacy, so not every one of those jobs is in drug research. The pattern is still clear. Western Connecticut (the Danbury to Stamford area) and Southeastern Connecticut (around New London and Groton) hold large research establishments, and South Central, around New Haven, holds the biotech labs. The state also had 107 drug wholesale establishments (NAICS 424210) with 4,121 employees.

Registered drug sites

FDA's Drug Establishments Current Registration Site (DECRS) had 45 Connecticut registrations in our count of the 30 October 2026 download: 19 that make finished drugs or active ingredients, 13 medical gas suppliers (our classification by firm name), 8 packers or relabelers, 4 testing labs and 1 oxygen transfill site. Manufacturers include MannKind in Danbury, ALK-Abello in Plainville, Biohaven Pharmaceuticals in New Haven, Sheffield Pharmaceuticals in New London, Miyoshi America in Dayville, Foster Delivery Science in Putnam, Tower Laboratories in Centerbrook and CooperSurgical in Trumbull. Several others, such as American Distilling in East Hampton, make over-the-counter products. Registration is the company's own filing and isn't an approval.

Listed drug companies headquartered in Connecticut

SEC EDGAR shows 14 listed companies in SIC codes 2833 to 2836 with a Connecticut business address. Checked in each latest 10-K:

Two names in EDGAR's Connecticut results are left out: Curaleaf, a cannabis company that files a Canadian-style 40-F and lists a Stamford agent address, and Yarrow Bioscience, whose 10-K cover gives Stewartsville, New Jersey. We didn't check two smaller ones, Azitra of Branford and IRulya Therapeutics. For the global companies with Connecticut research sites, see the largest pharmaceutical companies.

Checking a Connecticut company

• Licence. FDA lists the Connecticut Department of Consumer Protection as the agency that licenses wholesale drug distributors in the state.
• FDA record. FDA's Data Dashboard shows inspections, warning letters and recalls by site.
• The network. BioCT, the state affiliate of the Biotechnology Innovation Organization, names Boehringer Ingelheim, Pfizer, UConn and Yale as its co-founding partners, runs a member directory and a job board, and operates the Innovation Commons incubator in Groton.

Selling to Connecticut drug companies

With few plants, most buyers here are research and corporate teams. At a New Haven biotech of 15 to 250 people, one operations or CMC leader often buys lab services, outsourced manufacturing and software; at MannKind, plant engineering and quality buy for the Danbury site.

Worked example: a lab data software vendor

Illustrative example. The vendor and its prices are invented; the counts come from CBP 2023 and the 10-Ks above.

Elm City Lab Data (elmcitylab.example) sells an electronic lab notebook and sample tracker.

1. Start in New Haven. 44 biotech R&D establishments in South Central Connecticut, including the listed companies above.
2. Qualify. Companies with 20 to 300 employees and an active clinical program outgrow spreadsheets first.
3. Do the arithmetic. If 15 of the 44 fit, 6 take a pilot and 3 sign at $40,000 a year, that's $120,000 of annual revenue from one city.

Finding which labs are hiring scientists this quarter is the slow part; Bebop researches each account and suggests who to contact.

Next step: compare a state where research and plants grew up together in the Massachusetts pharmaceutical market report.