Company lists · Data refreshed September 2026

Top 25 Api contract manufacturers based in the United States

Name: Api contract manufacturers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 30, 2026 440 companies tracked

RevenueBase identified 440 api contract manufacturers headquartered in the United States as of September 2026 and tracks 20,085 professional contacts across them, including 6,806 with verified work emails. San Diego is the largest hub.

This list covers api contract manufacturers headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 30, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 30, 2026 86% judged on-target in blind review

440Companies

20,085Contacts tracked

6,806Verified emails

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The 25 largest api contract manufacturers based in the United States

Ranked by team size

Top 25 of 440 api contract manufacturers based in the United States, ranked by team size, largest first. Data refreshed Sep 30, 2026. RevenueBase Smart Search rates how each company's information relates to api contract manufacturers: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	KBI Biopharma	Partial evidence	Durham, NC, United StatesHQ checked Sep 30, 2026	1,001-5,000	1,645 contacts →
	Partial evidence “KBI Biopharma is an award-winning biopharmaceutical contract services organization providing fully-integrated, accelerated drug development and biomanufacturing services to…” Source: RevenueBase Database · checked Sep 30, 2026
2	Cambrex	Partial evidence	East Rutherford, NJ, United StatesHQ checked Sep 30, 2026	1,001-5,000	1,294 contacts →
	Partial evidence “Cambrex is a leading global contract development and manufacturing organization (CDMO) that provides drug substance development and manufacturing across the entire drug lifecycle…” Source: RevenueBase Database · checked Sep 30, 2026
3	Fisher Clinical Services	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 30, 2026	10001+	611 contacts →
	Indirect evidence “Thermo Fisher Scientific provides industry-leading pharma services solutions for drug development, clinical trial logistics, and commercial manufacturing to customers through our…” Source: RevenueBase Database · checked Sep 30, 2026
4	Veranova	Partial evidence	Devens, MA, United StatesHQ checked Sep 30, 2026	501-1,000	574 contacts →
	Partial evidence “Veranova is a global leader in process development and manufacturing of active pharmaceutical ingredients (APIs), with a focus on specialty and complex chemistry for small…” Source: RevenueBase Database · checked Sep 30, 2026
5	SK Pharmteco	Partial evidence	Rancho Cordova, CA, United StatesHQ checked Sep 30, 2026	1,001-5,000	540 contacts →
	Partial evidence “Established in 2019 by SK Inc, SK pharmteco is a global contract development and manufacturing organization (CDMO) with operations across the U.S, Europe, and South Korea.” Source: RevenueBase Database · checked Sep 30, 2026
6	Catalent Pharma Solutions	Indirect evidence	Somerset, NJ, United StatesHQ checked Sep 30, 2026	10001+	441 contacts →
	Indirect evidence “Catalent Inc.(NYSE: CTLT), an S&P 500® company, is the global leader in enabling pharma, biotech, and consumer health partners to optimize product development, launch, and full…” Source: RevenueBase Database · checked Sep 30, 2026
7	SPI Pharma	Indirect evidence	Wilmington, DE, United StatesHQ checked Sep 30, 2026	201-500	304 contacts →
	Indirect evidence “For over 75 years, we have supplied the pharmaceutical industry with highly engineered products and innovative solutions that improve the formulation and delivery of drug products…” Source: RevenueBase Database · checked Sep 30, 2026
8	MSN Pharmaceuticals INC	Partial evidence	Piscataway, NJ, United StatesHQ checked Sep 30, 2026	51-200	257 contacts →
	Partial evidence “MSN Pharmaceuticals Inc.(MSNPI), a fully owned subsidiary of MSN Group of Companies, is one of the fast-emerging Finished Dosages manufacturers of USA.” Source: RevenueBase Database · checked Sep 30, 2026
9	Arizona Nutritional Supplements ANS	Strong evidence	Chandler, AZ, United StatesHQ checked Sep 30, 2026	501-1,000	239 contacts →
	Strong evidence “Arizona Nutritional Supplements (ANS) is a full service, cGMP certified, contract manufacturer specializing in nutritional and dietary supplements.” Source: RevenueBase Database · checked Sep 30, 2026
10	Olon USA	Strong evidence	Concord, OH, United StatesHQ checked Sep 30, 2026	51-200	237 contacts →
	Strong evidence “Who we are: On June 9, 2017, Olon S.p.A, a leading Active Pharmaceutical Ingredients (API) contract development and manufacturing organization (CDMO) and Generics supplier…” Source: RevenueBase Database · checked Sep 30, 2026
11	Captek Softgel International	Strong evidence	Cerritos, CA, United StatesHQ checked Sep 30, 2026	501-1,000	225 contacts →
	Strong evidence “Established in 1996, CAPTEK® Softgel International Inc.(CSI) is a privately-owned, FDA registered and audited, GMP-certified, a full-service contract manufacturer of custom…” Source: RevenueBase Database · checked Sep 30, 2026
12	Halo Pharmaceutical, INC	Partial evidence	Whippany, NJ, United StatesHQ checked Sep 30, 2026	201-500	219 contacts →
	Partial evidence “Halo Pharma is a leading provider of pharmaceutical services, including contract dosage form development, commercial manufacturing, and analytical services.” Source: RevenueBase Database · checked Sep 30, 2026
13	Jubilant Pharma Limited	Indirect evidence	Yardley, PA, United StatesHQ checked Sep 30, 2026	1,001-5,000	184 contacts →
	Indirect evidence “Jubilant Pharma Limited is a global integrated pharmaceutical company offering a wide range of products and services to our customers across geographies.” Source: RevenueBase Database · checked Sep 30, 2026
14	Serán Bioscience	Indirect evidence	Bend, OR, United StatesHQ checked Sep 30, 2026	201-500	183 contacts →
	Indirect evidence “At Serán, Our mission is to provide optimized drug development and manufacturing services for our clients, from discovery to the clinic.” Source: RevenueBase Database · checked Sep 30, 2026
15	Quality Chemical Laboratories	Indirect evidence	Wilmington, NC, United StatesHQ checked Sep 30, 2026	201-500	177 contacts →
	Indirect evidence “QCL is science driven, quality focused, and responsive.” Source: RevenueBase Database · checked Sep 30, 2026
16	Ambiopharm	Indirect evidence	North Augusta, SC, United StatesHQ checked Sep 30, 2026	501-1,000	174 contacts →
	Indirect evidence “AmbioPharm is a global custom synthetic peptide CDMO founded in 2005 and headquartered in North Augusta, South Carolina, USA specializing in developing highly efficient…” Source: RevenueBase Database · checked Sep 30, 2026
17	Norwich Pharma Services	Partial evidence	Norwich, NY, United StatesHQ checked Sep 30, 2026	201-500	174 contacts →
	Partial evidence “Norwich is a leading provider of contract manufacturing and clinical services for the pharmaceuticals industry.” Source: RevenueBase Database · checked Sep 30, 2026
18	Global Pharma TEK	Indirect evidence	Edison, NJ, United StatesHQ checked Sep 30, 2026	201-500	169 contacts →
	Indirect evidence “Founded in 2011, Global Pharma Tek (GPT) is a leading pharmaceutical conglomerate offering a wide range of services to the industry.” Source: RevenueBase Database · checked Sep 30, 2026
19	Woodstock Sterile Solutions	Indirect evidence	Woodstock, United StatesHQ checked Sep 30, 2026	501-1,000	167 contacts →
	Indirect evidence “Woodstock Sterile Solutions is a leading global provider of best-in-class sterile development and manufacturing solutions – with a decades-long track record of helping the…” Source: RevenueBase Database · checked Sep 30, 2026
20	Medivant Healthcare	Partial evidence	Chandler, AZ, United StatesHQ checked Sep 30, 2026	51-200	158 contacts →
	Partial evidence “Uniquely poised as a world class FDA registered outsourcing pharmaceutical manufacturer, Medivant offers the best in the industry when it comes to reliability and management…” Source: RevenueBase Database · checked Sep 30, 2026
21	Biospectra, INC	Partial evidence	Bangor, PA, United StatesHQ checked Sep 30, 2026	201-500	152 contacts →
	Partial evidence “BioSpectra Inc.(BSI), is a privately-owned manufacturer of premium pharmaceutical ingredients and bulk, cGMP fine chemicals, in service to many leading BioPharma companies around…” Source: RevenueBase Database · checked Sep 30, 2026
22	LGM Pharma	Strong evidence	Boca Raton, FL, United StatesHQ checked Sep 30, 2026	51-200	152 contacts →
	Strong evidence “LGM Pharma is a leading CDMO provider of comprehensive API sourcing and drug product contract development and manufacturing solutions to the pharmaceutical industry.” Source: RevenueBase Database · checked Sep 30, 2026
23	Nexgen Pharma	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 30, 2026	201-500	142 contacts →
	Indirect evidence “Nexgen Pharma is a specialty pharmaceutical company that provides development and manufacturing services for Rx, OTC drugs as well as custom dietary supplement formulations.” Source: RevenueBase Database · checked Sep 30, 2026
24	Apicore Pharmaceuticals	Partial evidence	East Brunswick, NJ, United StatesHQ checked Sep 30, 2026	501-1,000	141 contacts →
	Partial evidence “Apicore LLC, a wholly owned subsidiary of RK Pharma Inc is a leading process R&D and API manufacturing service provider for the worldwide pharmaceutical industry.” Source: RevenueBase Database · checked Sep 30, 2026
25	Innovative Labs	Partial evidence	Springville, UT, United StatesHQ checked Sep 30, 2026	201-500	128 contacts →
	Partial evidence “Innovative Labs is a leading contract development manufacturing organization helping health and wellness brands create high-absorption products-taking products from an initial…” Source: RevenueBase Database · checked Sep 30, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: api contract manufacturers. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names api contract manufacturers.
Partial evidence: Its own public description names part of api contract manufacturers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name api contract manufacturers. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 440 api contract manufacturers based in the United States

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Api contract manufacturers based in the United States at a glance

As of Sep 30, 2026

33.9%Verified-email coverage

45.6Average contacts per company

11-50Median size (employees)

1.8%Largest-city concentration · San Diego

Sep 30, 2026Page data refreshed

Companies by employee count

1-10

108

11-50

153

51-200

112

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 440 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among api contract manufacturers, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “api contract manufacturers”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names api contract manufacturers), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among api contract manufacturers, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 6,806 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 30, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names api contract manufacturers, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many api contract manufacturers are there based in the United States?

RevenueBase identified 440 api contract manufacturers headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

KBI Biopharma, headquartered in Durham, tops this list with the largest team on record.

Which city has the most api contract manufacturers?

San Diego leads with 8 headquartered companies, followed by Wilmington (7) and Anaheim (6).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 6,806 verified decision-maker contacts tracked across these 440 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 30, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.