Company lists · Data refreshed September 2026

Top 25 Semiconductor testing companies worldwide

Name: Semiconductor testing companies worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 794 companies tracked

RevenueBase identified 794 semiconductor testing companies worldwide as of September 2026 and tracks 67,110 professional contacts across them, including 21,428 with verified work emails and 0 with mobile numbers. The United States is the largest market and San Jose the largest hub.

This list covers semiconductor testing companies worldwide, 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 17, 2026. Country and city lists for semiconductor testing companies follow the table.

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 17, 2026 86% judged on-target in blind review

794Companies

67,110Contacts tracked

21,428Verified emails

0Mobile numbers

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The 25 largest semiconductor testing companies worldwide

Ranked by team size

Top 25 of 794 semiconductor testing companies worldwide, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to semiconductor testing companies: 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	KLA	Indirect evidence	Milpitas, CA, United StatesHQ checked Sep 17, 2026	10001+	12,672 contacts →
	Indirect evidence “KLA develops industry-leading equipment and services that enable innovation throughout the electronics industry.” Source: RevenueBase Database · checked Sep 17, 2026
2	NI National Instruments	Indirect evidence	Austin, TX, United StatesHQ checked Sep 17, 2026	5,001-10,000	7,081 contacts →
	Indirect evidence “In 2023, Emerson acquired NI and introduced its new Test & Measurement business group.” Source: RevenueBase Database · checked Sep 17, 2026
3	Amkor Technology, INC	Partial evidence	Tempe, AZ, United StatesHQ checked Sep 17, 2026	10001+	6,435 contacts →
	Partial evidence “Amkor Technology, Inc.(Nasdaq: AMKR) is the world’s largest U.S-headquartered OSAT and is a global leader in outsourced semiconductor packaging and test services.” Source: RevenueBase Database · checked Sep 17, 2026
4	Teradyne	Indirect evidence	North Reading, MA, United StatesHQ checked Sep 17, 2026	5,001-10,000	4,720 contacts →
	Indirect evidence “Teradyne brings high-quality innovations such as smart devices, life-saving medical equipment and data storage systems to market, faster.” Source: RevenueBase Database · checked Sep 17, 2026
5	Tessolve	Indirect evidence	Bangalore, IndiaHQ checked Sep 17, 2026	1,001-5,000	2,888 contacts →
	Indirect evidence “Tessolve offers a unique combination of pre-silicon and post-silicon expertise to provide an efficient turnkey solution for silicon bring-up, and spec to the product.” Source: RevenueBase Database · checked Sep 17, 2026
6	Tokyo Electron US	Partial evidence	Austin, TX, United StatesHQ checked Sep 17, 2026	10001+	2,812 contacts →
	Partial evidence “Since its founding in 1963, TEL has grown to encompass many offices around the world that engineer, manufacture, sell, and service wafer-processing or semiconductor production…” Source: RevenueBase Database · checked Sep 17, 2026
7	Ultra Clean Technology	Partial evidence	Hayward, CA, United StatesHQ checked Sep 17, 2026	5,001-10,000	2,287 contacts →
	Partial evidence “UltraClean Holdings, Inc.(UCT) is a global leader in semiconductor fabrication support.” Source: RevenueBase Database · checked Sep 17, 2026
8	Formfactor INC	Indirect evidence	Livermore, CA, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,485 contacts →
	Indirect evidence “FormFactor is a leading provider of essential test and measurement technologies along the full IC life cycle – from characterization, modeling, reliability, and design debug, to…” Source: RevenueBase Database · checked Sep 17, 2026
9	Spil 矽品	Indirect evidence	台中市, TaiwanHQ checked Sep 17, 2026	10001+	1,200 contacts →
	Indirect evidence “Established in May 1984, Siliconware Precision Industries Co, Ltd.” Source: RevenueBase Database · checked Sep 17, 2026
10	Onto Innovation	Indirect evidence	Wilmington, MA, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,186 contacts →
	Indirect evidence “Onto Innovation is a leader in process control, combining global scale with an expanded portfolio of leading-edge technologies that include: Un-patterned wafer quality; 3D…” Source: RevenueBase Database · checked Sep 17, 2026
11	Unisem	Partial evidence	Kuala Lumpur, MalaysiaHQ checked Sep 17, 2026	5,001-10,000	1,109 contacts →
	Partial evidence “Unisem is a global provider of semiconductor assembly and test (OSAT) services for many of the world's most successful electronics companies.” Source: RevenueBase Database · checked Sep 17, 2026
12	Carsem	Partial evidence	Ipoh, MalaysiaHQ checked Sep 17, 2026	5,001-10,000	1,071 contacts →
	Partial evidence “Carsem is a leading provider of turnkey packaging and test services to the semiconductor industry, and offers one of the largest package and test portfolios in the world.” Source: RevenueBase Database · checked Sep 17, 2026
13	Cohu, INC	Partial evidence	San Diego, CA, United StatesHQ checked Sep 17, 2026	1,001-5,000	769 contacts →
	Partial evidence “Cohu is the leading supplier of semiconductor test handlers and contactors, and a growing provider of automated test equipment, inspection & metrology solutions, and data…” Source: RevenueBase Database · checked Sep 17, 2026
14	KYEC	Partial evidence	Chu-nan, ChinaHQ checked Sep 17, 2026	5,001-10,000	656 contacts →
	Partial evidence “King Yuan Electronics Corp.(KYEC) provides wafer probing, final product test and assembly service for the semiconductor backend supply chain.” Source: RevenueBase Database · checked Sep 17, 2026
15	ASE Electronics M SDN BHD	Indirect evidence	Bayan Lepas, MalaysiaHQ checked Sep 17, 2026	1,001-5,000	652 contacts →
	Indirect evidence “A Success Enabler ASE Electronics (M) Sdn.” Source: RevenueBase Database · checked Sep 17, 2026
16	Eurofins EAG Laboratories	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 17, 2026	1,001-5,000	632 contacts →
	Indirect evidence “When it comes to understanding the physical structure, chemical properties and performance of advanced materials and integrated circuitry, no other scientific services company…” Source: RevenueBase Database · checked Sep 17, 2026
17	Mattson Technology	Partial evidence	Fremont, CA, United StatesHQ checked Sep 17, 2026	501-1,000	579 contacts →
	Partial evidence “Mattson Technology designs, manufactures, markets and supports semiconductor wafer processing equipment used in the fabrication of integrated circuits.” Source: RevenueBase Database · checked Sep 17, 2026
18	FM Industries	Indirect evidence	Fremont, CA, United StatesHQ checked Sep 17, 2026	201-500	552 contacts →
	Indirect evidence “FM Industries, Inc.” Source: RevenueBase Database · checked Sep 17, 2026
19	Link Engineering Company	Indirect evidence	Plymouth, MI, United StatesHQ checked Sep 17, 2026	501-1,000	509 contacts →
	Indirect evidence “Link Group, Inc.(LINK), parent to Link Engineering Company, Link Industries and Tescor, consists of businesses that offer customized solutions, with a focus on delivering high…” Source: RevenueBase Database · checked Sep 17, 2026
20	Chroma ATE INC	Indirect evidence	Taoyuan City, TaiwanHQ checked Sep 17, 2026	1,001-5,000	498 contacts →
	Indirect evidence “Founded in 1984, Chroma ATE Inc.” Source: RevenueBase Database · checked Sep 17, 2026
21	Universal Instruments Corporation	Partial evidence	Conklin, NY, United StatesHQ checked Sep 17, 2026	501-1,000	410 contacts →
	Partial evidence “We are a technology leader in the design and manufacture of precision automation solutions for the semiconductor and electronics manufacturing industry.” Source: RevenueBase Database · checked Sep 17, 2026
22	R&d Altanova	Indirect evidence	South Plainfield, NJ, United StatesHQ checked Sep 17, 2026	10001+	280 contacts →
	Indirect evidence “With the acquisition of R&D Altanova by Advantest, I am pleased I am now part of Advantest Interconnect Solutions (AIS).” Source: RevenueBase Database · checked Sep 17, 2026
23	Sigurd Microelectronics Corporation 矽格股份有限公司	Partial evidence	Chutung Chen, TaiwanHQ checked Sep 17, 2026	1,001-5,000	277 contacts →
	Partial evidence “1988(OSAT, Outsourced Semiconductor Assembly and Test Services)30 WLCSP)(Bump)(Flip Chip)(Window BGA wBGA)IC 200345388 115,1006(OSAT Group)202112 2023 2023RBA 2023- 2023TTQS 2023…” Source: RevenueBase Database · checked Sep 17, 2026
24	南茂科技股份有限公司	Indirect evidence	新竹市, TaiwanHQ checked Sep 17, 2026	5,001-10,000	262 contacts →
	Indirect evidence “19978ICICIC back-end serviceIC 5C; ISO 9002 QS 4.5CNLA” Source: RevenueBase Database · checked Sep 17, 2026
25	MPI Corporation	Indirect evidence	Zhubei, TaiwanHQ checked Sep 17, 2026	1,001-5,000	234 contacts →
	Indirect evidence “Founded in 1995 and headquartered in Hsinchu, Taiwan, MPI Corporation is a global technology leader in test and measurement solutions spanning the full integrated-circuit…” Source: RevenueBase Database · checked Sep 17, 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: semiconductor testing companies. 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 semiconductor testing companies.
Partial evidence: Its own public description names part of semiconductor testing companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name semiconductor testing companies. 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 794 semiconductor testing companies worldwide

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Semiconductor testing companies worldwide at a glance

As of Sep 17, 2026

31.9%Verified-email coverage

84.5Average contacts per company

11-50Median size (employees)

3.0%Largest-city concentration · San Jose

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

249

11-50

243

51-200

155

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 semiconductor testing companies, 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.
Coverage: 7 countries, largest first: the United States, China, India, Taiwan, Germany, Malaysia, the United Kingdom. Country and city lists for semiconductor testing companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “semiconductor testing companies”. 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 semiconductor testing companies), 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 semiconductor testing companies, and records with no verified work email.
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, 21,428 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 17, 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.

Semiconductor testing companies by location

7 lists · largest first

Every Semiconductor testing companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

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 semiconductor testing companies, 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 semiconductor testing companies are there worldwide?

RevenueBase identified 794 semiconductor testing companies worldwide 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?

KLA, headquartered in Milpitas, tops this list with the largest team on record.

Which country has the most semiconductor testing companies?

The United States leads with 309 companies, followed by China (177) and India (100). Every semiconductor testing companies list by country and city is linked on this page.

Which city has the most semiconductor testing companies?

San Jose leads with 24 headquartered companies, followed by Bangalore (21) and Austin (16).

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 21,428 verified decision-maker contacts tracked across these 794 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 17, 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.