Company lists · Data refreshed September 2026

Top 25 Active pharmaceutical ingredients suppliers based in the United States

Name: Active pharmaceutical ingredients suppliers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 316 companies tracked

RevenueBase identified 316 active pharmaceutical ingredients suppliers headquartered in the United States as of September 2026 and tracks 8,857 professional contacts across them, including 2,897 with verified work emails. San Diego is the largest hub.

This list covers active pharmaceutical ingredients suppliers 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 16, 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 16, 2026 86% judged on-target in blind review

316Companies

8,857Contacts tracked

2,897Verified emails

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The 25 largest active pharmaceutical ingredients suppliers based in the United States

Ranked by team size

Top 25 of 316 active pharmaceutical ingredients suppliers based in the United States, ranked by team size, largest first. Data refreshed Sep 16, 2026. RevenueBase Smart Search rates how each company's information relates to active pharmaceutical ingredients suppliers: 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	Veranova	Strong evidence	Devens, MA, United StatesHQ checked Sep 16, 2026	501-1,000	574 contacts →
	Strong 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 16, 2026
2	SK Pharmteco	Indirect evidence	Rancho Cordova, CA, United StatesHQ checked Sep 16, 2026	1,001-5,000	540 contacts →
	Indirect 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 16, 2026
3	SPI Pharma	Strong evidence	Wilmington, DE, United StatesHQ checked Sep 16, 2026	201-500	304 contacts →
	Strong 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 16, 2026
4	Olon USA	Strong evidence	Concord, OH, United StatesHQ checked Sep 16, 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 16, 2026
5	Spectrum Chemical Mfg. Corp	Indirect evidence	New Brunswick, NJ, United StatesHQ checked Sep 16, 2026	201-500	232 contacts →
	Indirect evidence “Spectrum Chemical Mfg.” Source: RevenueBase Database · checked Sep 16, 2026
6	Halo Pharmaceutical, INC	Partial evidence	Whippany, NJ, United StatesHQ checked Sep 16, 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 16, 2026
7	Jubilant Pharma Limited	Partial evidence	Yardley, PA, United StatesHQ checked Sep 16, 2026	1,001-5,000	184 contacts →
	Partial 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 16, 2026
8	Adesis, INC	Indirect evidence	New Castle, DE, United StatesHQ checked Sep 16, 2026	51-200	182 contacts →
	Indirect evidence “Adesis Inc.” Source: RevenueBase Database · checked Sep 16, 2026
9	Quality Chemical Laboratories	Indirect evidence	Wilmington, NC, United StatesHQ checked Sep 16, 2026	201-500	177 contacts →
	Indirect evidence “QCL is science driven, quality focused, and responsive.” Source: RevenueBase Database · checked Sep 16, 2026
10	Ambiopharm	Indirect evidence	North Augusta, SC, United StatesHQ checked Sep 16, 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 16, 2026
11	Norwich Pharma Services	Partial evidence	Norwich, NY, United StatesHQ checked Sep 16, 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 16, 2026
12	Global Pharma TEK	Partial evidence	Edison, NJ, United StatesHQ checked Sep 16, 2026	201-500	169 contacts →
	Partial 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 16, 2026
13	Biospectra, INC	Strong evidence	Bangor, PA, United StatesHQ checked Sep 16, 2026	201-500	152 contacts →
	Strong 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 16, 2026
14	Seatex	Indirect evidence	Rosenberg, TX, United StatesHQ checked Sep 16, 2026	201-500	147 contacts →
	Indirect evidence “Extensive chemical synthesis, formulation, manufacturing, and technology expertise.” Source: RevenueBase Database · checked Sep 16, 2026
15	Apicore Pharmaceuticals	Partial evidence	East Brunswick, NJ, United StatesHQ checked Sep 16, 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 16, 2026
16	Ortec INC	Indirect evidence	Easley, SC, United StatesHQ checked Sep 16, 2026	201-500	139 contacts →
	Indirect evidence “Ortec is a custom chemical manufacturing and research company that helps our customers reach their market goals through our Technical Expertise, Quality Systems, Regulatory…” Source: RevenueBase Database · checked Sep 16, 2026
17	Medchemexpress LLC	Partial evidence	Monmouth Junction, NJ, United StatesHQ checked Sep 16, 2026	1,001-5,000	122 contacts →
	Partial evidence “MedChemExpress (MCE) is a leading global supplier of life science reagents, dedicated to providing innovative solutions for scientific research and drug development.” Source: RevenueBase Database · checked Sep 16, 2026
18	Ascent Pharmaceuticals, INC	Partial evidence	Central Islip, NY, United StatesHQ checked Sep 16, 2026	201-500	116 contacts →
	Partial evidence “Ascent Pharmaceuticals, Inc, headquartered in Central Islip, New York, is a leading generic pharmaceutical company specializing in the development, manufacturing, and analysis of…” Source: RevenueBase Database · checked Sep 16, 2026
19	Chartwell Pharmaceuticals	Partial evidence	Congers, NY, United StatesHQ checked Sep 16, 2026	51-200	115 contacts →
	Partial evidence “Chartwell Pharmaceuticals is a US-based, full-service manufacturing, packaging, laboratory, and related supply chain services organization with multiple manufacturing locations in…” Source: RevenueBase Database · checked Sep 16, 2026
20	CJB Industries, INC	Indirect evidence	Valdosta, GA, United StatesHQ checked Sep 16, 2026	51-200	110 contacts →
	Indirect evidence “At CJB Industries, we deliver solutions to your chemical manufacturing challenges.” Source: RevenueBase Database · checked Sep 16, 2026
21	Scientific Protein Laboratories, LLC	Strong evidence	Waunakee, WI, United StatesHQ checked Sep 16, 2026	201-500	104 contacts →
	Strong evidence “Scientific Protein Laboratories (SPL) has been a leading global supplier of high quality active pharmaceutical ingredients (APIs) for over three decades.” Source: RevenueBase Database · checked Sep 16, 2026
22	Wiley Companies	Partial evidence	Coshocton, OH, United StatesHQ checked Sep 16, 2026	201-500	102 contacts →
	Partial evidence “Wiley Companies is an ISO 9001:2015 and FSSC certified custom chemicals and food ingredients manufacturer with facilities in Coshocton, OH, and New Albany, OH.” Source: RevenueBase Database · checked Sep 16, 2026
23	Ethox Chemicals	Indirect evidence	Greenville, SC, United StatesHQ checked Sep 16, 2026	201-500	82 contacts →
	Indirect evidence “Ethox Chemicals, A Syntha Group Company Founded in 1938 by Fred Wilson, Sr.” Source: RevenueBase Database · checked Sep 16, 2026
24	Chemwerth INC	Partial evidence	Woodbridge, CT, United StatesHQ checked Sep 16, 2026	51-200	81 contacts →
	Partial evidence “LEADING THE SUPPLY OF HIGH QUALITY GENERIC APIs 21st Century economic, social, technical and regulatory dynamics are dramatically changing the pharmaceutical world making it more…” Source: RevenueBase Database · checked Sep 16, 2026
25	Synsmart	Indirect evidence	Newtown, PA, United StatesHQ checked Sep 16, 2026	51-200	78 contacts →
	Indirect evidence “Founded in 2014, SynSmart has made its name in chemistry services for early-stage discovery projects as well as collaborative scale-up and manufacturing support services.” Source: RevenueBase Database · checked Sep 16, 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: active pharmaceutical ingredients suppliers. 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 active pharmaceutical ingredients suppliers.
Partial evidence: Its own public description names part of active pharmaceutical ingredients suppliers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name active pharmaceutical ingredients suppliers. 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 316 active pharmaceutical ingredients suppliers based in the United States

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Active pharmaceutical ingredients suppliers based in the United States at a glance

As of Sep 16, 2026

32.7%Verified-email coverage

28.0Average contacts per company

11-50Median size (employees)

2.8%Largest-city concentration · San Diego

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

108

11-50

116

51-200

201-500

501-1,000

1,001-5,000

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 316 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 active pharmaceutical ingredients suppliers, 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 “active pharmaceutical ingredients suppliers”. 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 active pharmaceutical ingredients suppliers), 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 active pharmaceutical ingredients suppliers, 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, 2,897 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 16, 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 active pharmaceutical ingredients suppliers, 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 active pharmaceutical ingredients suppliers are there based in the United States?

RevenueBase identified 316 active pharmaceutical ingredients suppliers 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?

Veranova, headquartered in Devens, tops this list with the largest team on record.

Which city has the most active pharmaceutical ingredients suppliers?

San Diego leads with 9 headquartered companies, followed by Wilmington (6) and Houston (4).

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 2,897 verified decision-maker contacts tracked across these 316 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 16, 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.