Company lists · Data refreshed September 2026

Top 25 Contract assembly manufacturers based in the United States

Name: Contract assembly 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 16, 2026 1,846 companies tracked

RevenueBase identified 1,846 contract assembly manufacturers headquartered in the United States as of September 2026 and tracks 53,336 professional contacts across them, including 14,610 with verified work emails. San Jose is the largest hub.

This list covers contract assembly 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 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

1,846Companies

53,336Contacts tracked

14,610Verified emails

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The 25 largest contract assembly manufacturers based in the United States

Ranked by team size

Top 25 of 1,846 contract assembly manufacturers 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 contract assembly 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	Plexus Corp	Indirect evidence	Neenah, NC, United StatesHQ checked Sep 16, 2026	10001+	8,149 contacts →
	Indirect evidence “Since 1979, Plexus has been partnering with companies to create the products that build a better world.” Source: RevenueBase Database · checked Sep 16, 2026
2	Kimball Electronics	Indirect evidence	Jasper, IN, United StatesHQ checked Sep 16, 2026	5,001-10,000	2,192 contacts →
	Indirect evidence “Kimball Electronics was founded in 1961.” Source: RevenueBase Database · checked Sep 16, 2026
3	Smtc Corporation	Partial evidence	Melbourne, FL, United StatesHQ checked Sep 16, 2026	1,001-5,000	971 contacts →
	Partial evidence “SMTC is a global Electronics Manufacturing Services (EMS) provider, delivering fully integrated and customized contract manufacturing services.” Source: RevenueBase Database · checked Sep 16, 2026
4	Keytronic	Strong evidence	Spokane Valley, WA, United StatesHQ checked Sep 16, 2026	1,001-5,000	819 contacts →
	Strong evidence “Keytronic is a value-added contract manufacturer to some of the world’s leading OEMs.” Source: RevenueBase Database · checked Sep 16, 2026
5	MICRO	Strong evidence	Somerset, NJ, United StatesHQ checked Sep 16, 2026	501-1,000	723 contacts →
	Strong evidence “MICRO is a full service contract manufacturer that draws on more than 80 years of experience in medical device assembly, precision metal stamping, insert and injection molding…” Source: RevenueBase Database · checked Sep 16, 2026
6	OSI Electronics	Indirect evidence	Hawthorne, CA, United StatesHQ checked Sep 16, 2026	1,001-5,000	634 contacts →
	Indirect evidence “OSI Electronics is a global Manufacturing Solutions provider headquartered in Hawthorne, CA, and Singapore.” Source: RevenueBase Database · checked Sep 16, 2026
7	IEC Electronics Corp	Indirect evidence	Newark, NY, United StatesHQ checked Sep 16, 2026	n/a	563 contacts →
	Indirect evidence “IEC Electronics, acquired by Creation Technologies in 2021, is a provider of electronic manufacturing services ("EMS") to advanced technology companies that produce life-saving…” Source: RevenueBase Database · checked Sep 16, 2026
8	Accumed Corp	Partial evidence	Mocksville, NC, United StatesHQ checked Sep 16, 2026	1,001-5,000	559 contacts →
	Partial evidence “AccuMED Corp is a contract manufacturing partner to major medical device companies, providing exceptional, customer-centric solutions of the highest quality on time and at…” Source: RevenueBase Database · checked Sep 16, 2026
9	Tegra Medical	Strong evidence	Franklin, MA, United StatesHQ checked Sep 16, 2026	501-1,000	510 contacts →
	Strong evidence “Tegra Medical is an end-to-end contract manufacturing solutions provider, known as the company “where medical devices come to life.” Our customers look to us to manufacture…” Source: RevenueBase Database · checked Sep 16, 2026
10	Tessy Plastics Corp	Strong evidence	Skaneateles, NY, United StatesHQ checked Sep 16, 2026	1,001-5,000	499 contacts →
	Strong evidence “Founded in 1973, Tessy Plastics is a global contract manufacturer headquartered in Skaneateles, NY, specializing in injection molding and custom automated assembly solutions.” Source: RevenueBase Database · checked Sep 16, 2026
11	Mack Technologies	Strong evidence	Westford, MA, United StatesHQ checked Sep 16, 2026	1,001-5,000	405 contacts →
	Strong evidence “Mack Technologies is a leading supplier of printed circuit board assembly, systems assembly, and electronics contract manufacturing services for the defense, communications…” Source: RevenueBase Database · checked Sep 16, 2026
12	Sigmatron International	Indirect evidence	Elk Grove Village, IL, United StatesHQ checked Sep 16, 2026	1,001-5,000	391 contacts →
	Indirect evidence “Service-Driven Electronics Manufacturing.” Source: RevenueBase Database · checked Sep 16, 2026
13	Oberg Industries	Strong evidence	Freeport, PA, United StatesHQ checked Sep 16, 2026	501-1,000	356 contacts →
	Strong evidence “Oberg Industries is a global contract manufacturer producing precision machined and stamped metal components, tooling, and assemblies for some of the world’s most recognized…” Source: RevenueBase Database · checked Sep 16, 2026
14	Plastikon Industries INC	Strong evidence	Hayward, CA, United StatesHQ checked Sep 16, 2026	201-500	325 contacts →
	Strong evidence “PLASTIKON INDUSTRIES was established in 1982 with the mission to be recognized as a world-leading plastic and contract manufacturer.” Source: RevenueBase Database · checked Sep 16, 2026
15	Harmac Medical Products	Partial evidence	Buffalo, NY, United StatesHQ checked Sep 16, 2026	1,001-5,000	308 contacts →
	Partial evidence “Your Global Partner for Full-Service Contract Manufacturing of Single-Use Medical Devices.” Source: RevenueBase Database · checked Sep 16, 2026
16	MW Components	Indirect evidence	Charlotte, NC, United StatesHQ checked Sep 16, 2026	1,001-5,000	293 contacts →
	Indirect evidence “MW Components is focused on accelerating the entire process of delivering custom, stock, and standard parts to virtually any volume and against demanding deadlines.” Source: RevenueBase Database · checked Sep 16, 2026
17	AVNA	Partial evidence	New Britain, CT, United StatesHQ checked Sep 16, 2026	201-500	293 contacts →
	Partial evidence “AVNA (formerly OKAY Industries) is a contract manufacturing partner for leading medical device OEMs.” Source: RevenueBase Database · checked Sep 16, 2026
18	VEXOS	Indirect evidence	New York, NY, United StatesHQ checked Sep 16, 2026	501-1,000	283 contacts →
	Indirect evidence “Vexos, is an award-winning global electronics manufacturing services (EMS) and custom material solutions (CMS) company, providing complete end-to-end supply chain management…” Source: RevenueBase Database · checked Sep 16, 2026
19	Ascentec Engineering, LLC	Indirect evidence	Tualatin, OR, United StatesHQ checked Sep 16, 2026	201-500	272 contacts →
	Indirect evidence “Ascentec Engineering was founded in 2001 by a team of process and manufacturing engineers all with a solid background in electronics manufacturing processes.” Source: RevenueBase Database · checked Sep 16, 2026
20	Penn United Technologies, INC	Partial evidence	Cabot, PA, United StatesHQ checked Sep 16, 2026	501-1,000	254 contacts →
	Partial evidence “Penn United provides MANUFACTURING SOLUTIONS for customers needing precision components or precision-assembled products.” Source: RevenueBase Database · checked Sep 16, 2026
21	MC Assembly	Strong evidence	Melbourne, FL, United StatesHQ checked Sep 16, 2026	1,001-5,000	241 contacts →
	Strong evidence “MC Assembly® is a leader in the contract manufacturing industry.” Source: RevenueBase Database · checked Sep 16, 2026
22	Major Tool & Machine	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 16, 2026	201-500	233 contacts →
	Indirect evidence “Established in 1946, Major Tool & Machine started business as a custom job shop specializing in the production of tooling and aircraft ground support equipment and has since…” Source: RevenueBase Database · checked Sep 16, 2026
23	I3 Assembly	Partial evidence	Binghamton, NY, United StatesHQ checked Sep 16, 2026	201-500	231 contacts →
	Partial evidence “i3 Assembly LLC is dedicated to advancing our competitive excellence from development through full-scale production manufacturing.” Source: RevenueBase Database · checked Sep 16, 2026
24	NIC Global Manufacturing Solutions	Strong evidence	Woodinville, TN, United StatesHQ checked Sep 16, 2026	501-1,000	229 contacts →
	Strong evidence “NIC Global is a single-source manufacturer providing turn-key mechanical and electromechanical assembly, expert sheet metal fabrication, and global sourcing of metal and plastic…” Source: RevenueBase Database · checked Sep 16, 2026
25	Intervala, LLC	Partial evidence	Mount Pleasant, PA, United StatesHQ checked Sep 16, 2026	201-500	226 contacts →
	Partial evidence “Full-service manufacturer.” 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: contract assembly 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 contract assembly manufacturers.
Partial evidence: Its own public description names part of contract assembly manufacturers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name contract assembly 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 1,846 contract assembly manufacturers based in the United States

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Contract assembly manufacturers based in the United States at a glance

As of Sep 16, 2026

27.4%Verified-email coverage

28.9Average contacts per company

11-50Median size (employees)

2.3%Largest-city concentration · San Jose

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

423

11-50

687

51-200

526

201-500

130

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 1,846 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 contract assembly 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 “contract assembly 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 contract assembly 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 contract assembly 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, 14,610 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.

Contract assembly manufacturers by metro

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 contract assembly 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 contract assembly manufacturers are there based in the United States?

RevenueBase identified 1,846 contract assembly 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?

Plexus Corp, headquartered in Raleigh, tops this list with the largest team on record.

Which city has the most contract assembly manufacturers?

San Jose leads with 42 headquartered companies, followed by Fremont (28) and Rochester (27).

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 14,610 verified decision-maker contacts tracked across these 1,846 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.