KLA

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A semiconductor equipment company specializing in process control, inspection, metrology, yield management and related specialty manufacturing systems.

Last updated November 4, 2026

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First read: Nov 4, 2026
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Overview

KLA Corporation is a United States-based semiconductor equipment and process-control company headquartered in Milpitas, California. Its systems, software and services help manufacturers detect defects, measure critical dimensions, analyze process variation and improve production yield across the semiconductor and broader electronics industries. KLA operates primarily as an enabling technology supplier: it does not manufacture finished chips, but provides the measurement, inspection, analytics and specialty process tools that allow chipmakers and electronics manufacturers to develop and produce devices more efficiently and reliably. The company traces its origins to KLA Instruments, founded in 1975 by Ken Levy and Bob Anderson to develop photomask inspection technology, and Tencor Instruments, founded in 1976 by Karel Urbanek and John Schwabacher to measure semiconductor film thickness and related wafer characteristics. KLA Instruments expanded from photomask inspection into wafer inspection, metrology and defect analysis. Tencor developed thin-film measurement technologies and later laser-scanning systems for identifying particles and contamination. The two businesses merged in April 1997, creating KLA-Tencor Corporation and combining complementary inspection, metrology, software and yield-management capabilities. KLA's central business is Semiconductor Process Control. This portfolio includes patterned and unpatterned wafer inspection, reticle and photomask inspection, critical-dimension and overlay metrology, film and materials measurement, defect review, classification, data management and process-control software. These systems are used from research and development through high-volume manufacturing. The company supports advanced logic, DRAM, 3D NAND, legacy-node semiconductors, power devices, compound semiconductors, MEMS, LEDs, data-storage products and other specialized devices. Its tools are intended to identify process excursions early, correlate defects with manufacturing conditions and help customers stabilize production at increasingly small geometries. KLA broadened its scope through a long series of acquisitions. Earlier transactions added capabilities in electron-beam inspection, interferometric wafer measurement, lithography modeling, advanced process control, surface inspection, wafer metrology, temperature monitoring, optical profiling and computational lithography. The 2019 acquisition of Orbotech was particularly important because it added inspection, testing, direct imaging and process-enabling technologies for printed circuit boards, flat-panel displays, advanced packaging and related electronic components. Orbotech also brought SPTS Technologies, whose specialty semiconductor process equipment includes etch, physical vapor deposition, chemical vapor deposition and molecular vapor deposition systems for markets such as MEMS, power devices, compound semiconductors, LEDs and advanced packaging. In 2019, KLA-Tencor changed its corporate name to KLA Corporation. The shorter name was intended to present a unified identity across the traditional KLA semiconductor process-control business and the acquired Orbotech and SPTS operations. KLA continues to organize its business around semiconductor process control, specialty semiconductor process equipment, and PCB and component inspection. Its service organization supports the installed base with maintenance, upgrades, applications assistance, spare parts and other lifecycle services. Service revenue is strategically important because it creates recurring relationships with customers and extends the productive life of installed systems. KLA's competitive positioning rests on technical precision, defect sensitivity, process knowledge, software and analytics, applications expertise and a large global installed base. Its products are deeply integrated into customers' manufacturing workflows, making process data and tool performance important to yield improvement…

History

KLA's history begins in Silicon Valley during the emergence of commercial semiconductor manufacturing. KLA Instruments was founded in 1975 by Ken Levy and Bob Anderson. Its early focus was photomask inspection: photomasks are patterned plates used to transfer circuit designs onto semiconductor wafers, and defects in those masks can be reproduced across many chips. Automated inspection therefore offered chipmakers a way to identify yield-threatening defects before they propagated through production. Tencor Instruments began operations in 1976. Founded by Karel Urbanek and John Schwabacher, Tencor initially concentrated on precise measurement of thin semiconductor films. Film thickness and uniformity are important because modern chips are built from many carefully controlled layers. Tencor subsequently expanded into laser-scanning inspection, particle and contamination detection, defect review and data-analysis equipment. The complementary capabilities of KLA and Tencor reflected a wider shift in semiconductor manufacturing: inspection was increasingly being combined with quantitative metrology and software-based process analysis. KLA broadened its product range during the 1980s and 1990s. KLA developed wafer-inspection systems and related analysis tools, while Tencor added technologies for measuring films, wafer shape, surface characteristics and production defects. In 1984, KLA introduced an automated patterned-wafer inspection system associated with the KLA 2020 product lineage, helping establish automated optical inspection as a central part of chip-production process control. Both companies also pursued electron-beam, optical, interferometric and computational methods as semiconductor geometries became smaller and manufacturing processes more complex. In April 1997, KLA Instruments and Tencor Instruments merged to form KLA-Tencor Corporation. The combination created a broader supplier of inspection, metrology, diagnostics and yield-management systems. Rather than offering a single manufacturing step, the merged company could address several stages of wafer, reticle and integrated-circuit production and could connect measurements with software and engineering services. The companies' combined annual revenue at the time of the merger exceeded one billion dollars according to historical accounts. The late 1990s and 2000s were marked by acquisitions that filled technology gaps and expanded KLA-Tencor's geographic and application reach. In 1998, the company acquired Nanopro GmbH for interferometric wafer-shape and thickness measurement technology; Amray for scanning electron microscope systems; VARS for image archiving and retrieval; the Quantox oxide-monitoring product line from Keithley Instruments; and Ultrapointe from Uniphase. In 1999, it acquired ACME Systems, a Taiwan-based yield-analysis software company. In 2000, Finle Technologies added lithography modeling and analysis software, while Fab Solutions contributed advanced process-control software. Phase Metrics followed in 2001, strengthening yield management and process control. KLA-Tencor continued to expand its inspection and metrology portfolio through acquisitions including Candela Instruments and Inspex's wafer-inspection business in 2004, ADE Corporation in 2006, and OnWafer Technologies, SensArray and Therma-Wave in 2007. These transactions added surface inspection, silicon-wafer metrology, lithography and plasma-etch products, temperature monitoring and other process-control capabilities. In 2008, ICOS Vision Systems and the microelectronic inspection equipment business of Vistec Semiconductor Systems broadened the company's inspection and testing activities. Ambios Technology was acquired in 2010, followed by Luminescent Technologies in 2014 for computational lithography and inspection capabilities, and Zeta Technologies in 2017 for optical profiling and inspection. The company also extended its materials and nanoscale measurement portfolio. In 2018, KLA-Tencor acquired the Nano Indenter product line from Keysight Technologies, as well as Nanomechanics and MicroVision. These businesses complemented KLA's broader interest in materials characterization, surface measurement and process analysis. The most transformative expansion came through the acquisition of Orbotech. Announced in 2018 and completed on February 20, 2019, the transaction brought KLA into a wider set of electronics-manufacturing markets. Orbotech supplied inspection, testing, direct imaging and process-enabling systems for printed circuit boards, flat-panel displays, advanced packaging and semiconductor production. Orbotech also owned SPTS Technologies, a specialist in etch, PVD, CVD and MVD equipment for MEMS, LEDs, power devices, compound semiconductors, high-speed radio-frequency devices and advanced packaging. The combination gave KLA a stronger position beyond traditional front-end wafer process control. In 2019, KLA-Tencor announced that it would change its name to KLA Corporation. The change became effective in July and reflected the company's effort to present its expanded portfolio under one shorter corporate identity. In the same year, KLA acquired Qoniac GmbH, a German software company specializing in semiconductor process-control software. KLA later continued developing products for automotive semiconductors and other markets where defect detection, outgoing quality and reliability are particularly important. KLA's modern business is organized into three reportable segments: Semiconductor Process Control; Specialty Semiconductor Process; and PCB and Component Inspection. Semiconductor Process Control includes inspection, metrology, analytics, software and services for wafers, reticles, integrated circuits and related materials. Specialty Semiconductor Process includes SPTS equipment for deposition and etch applications. PCB and Component Inspection encompasses systems used in printed-circuit-board, display, packaging, MEMS and other component manufacturing. The company maintains a large global service and applications organization. Its services include field support, preventive maintenance, upgrades, spare parts, training and process-development assistance. This installed-base model connects KLA to customers over the full life of a tool and helps manufacturers use process data to improve yield, reduce waste and accelerate technology ramps. As of 2026, KLA remained headquartered in Milpitas, operated internationally and continued to invest in process-control technologies associated with advanced logic, memory, high-bandwidth memory, extreme ultraviolet lithography, advanced packaging, automotive electronics and AI-related semiconductor demand.

2026
Fiscal 2026 annual report filed
[3]KLA Corporation fiscal 2026 annual reports and SEC filingsir.kla.com
KLA files its fiscal 2026 annual report and continues operations as an active publicly traded semiconductor-equipment company.
2021
Automotive semiconductor inspection portfolio launches
[8]KLA launches automotive semiconductor inspection portfolioir.kla.com
KLA introduces inspection and inline screening products intended to improve automotive-chip yield and reliability.
2021
Ann Arbor-area headquarters opens
[1]KLA Corporation — Wikipediaen.wikipedia.org
KLA opens a second North American headquarters near Ann Arbor, Michigan, supporting engineering, research and customer activities.
2019
Orbotech acquisition closes
[5]KLA Corporation fiscal 2025 Form 10-K business combinations disclosureir.kla.com
KLA completes the acquisition of Orbotech, adding PCB, display, advanced-packaging and specialty electronics technologies.
2019
Corporate name changes to KLA
[1]KLA Corporation — Wikipediaen.wikipedia.org
KLA-Tencor adopts the name KLA Corporation, unifying the corporate identity after its portfolio expansion.
2019
Qoniac acquisition
[6]KLA Corporation fiscal 2022 Form 10-K acquisition disclosureir.kla.com
KLA acquires Qoniac GmbH to expand semiconductor process-control software capabilities.
2018
Nano Indenter, Nanomechanics and MicroVision additions
[1]KLA Corporation — Wikipediaen.wikipedia.org
KLA-Tencor expands nanoscale measurement and materials-characterization capabilities through the Nano Indenter product line and related acquisitions.
2017
Zeta Technologies acquisition
[1]KLA Corporation — Wikipediaen.wikipedia.org
The company acquires Zeta Technologies for optical profiling and inspection capabilities.
2014
Luminescent Technologies acquisition
[1]KLA Corporation — Wikipediaen.wikipedia.org
KLA-Tencor acquires Luminescent Technologies to expand computational lithography and inspection capabilities.
2010
Ambios Technology acquisition
[1]KLA Corporation — Wikipediaen.wikipedia.org
KLA-Tencor acquires Ambios Technology, adding technology and equipment related to materials and surface measurement.
2008
ICOS Vision Systems and Vistec MIE acquisitions
[1]KLA Corporation — Wikipediaen.wikipedia.org
KLA-Tencor expands testing and microelectronic inspection capabilities.
2007
OnWafer, SensArray and Therma-Wave acquisitions
[1]KLA Corporation — Wikipediaen.wikipedia.org
The company adds lithography and plasma-etch products, temperature monitoring and process-control technologies.
2006
ADE Corporation acquisition
[1]KLA Corporation — Wikipediaen.wikipedia.org
KLA-Tencor acquires ADE Corporation, adding silicon-wafer metrology and related equipment.
2004
Candela and Inspex wafer-inspection acquisitions
[1]KLA Corporation — Wikipediaen.wikipedia.org
The company expands surface-inspection and wafer-inspection capabilities through Candela Instruments and Inspex's wafer-inspection business.
2001
Phase Metrics acquisition
[1]KLA Corporation — Wikipediaen.wikipedia.org
KLA-Tencor acquires Phase Metrics, strengthening yield-management and process-control capabilities.
2000
Finle Technologies and Fab Solutions acquisitions
[1]KLA Corporation — Wikipediaen.wikipedia.org
The company adds lithography modeling, analysis and advanced process-control software capabilities.
1999
ACME Systems acquisition
[1]KLA Corporation — Wikipediaen.wikipedia.org
KLA-Tencor acquires Taiwan-based yield-analysis software maker ACME Systems.
1998
Expansion into electron-beam, interferometric and data-management technologies
[1]KLA Corporation — Wikipediaen.wikipedia.org
KLA-Tencor acquires Nanopro, Amray, VARS, the Quantox product line and Ultrapointe, broadening its measurement, microscopy and inspection portfolio.
1997
KLA Instruments and Tencor Instruments merge
[2]KLA Corporation fiscal 2025 Form 10-Ksec.gov
The two semiconductor process-control companies merge to form KLA-Tencor Corporation.
1984
Automated patterned-wafer inspection becomes a core technology
[9]KLA BBP 40th Anniversary technical historybbp.kla.com
KLA introduces the KLA 2020 product lineage, associated with automated patterned-wafer inspection for chip production.
1976
Tencor Instruments begins operations
[1]KLA Corporation — Wikipediaen.wikipedia.org
Karel Urbanek and John Schwabacher establish Tencor Instruments to develop precision semiconductor film-thickness and related measurement technologies.
1975
KLA Instruments is founded
[1]KLA Corporation — Wikipediaen.wikipedia.org
Ken Levy and Bob Anderson establish KLA Instruments, initially focusing on photomask inspection for semiconductor manufacturing.

Products and positioning

A high-technology process-control and yield-management specialist serving semiconductor and advanced-electronics manufacturers. KLA differentiates through defect detection, precision metrology, integrated data analysis, applications expertise, recurring service relationships and a broad installed base rather than through commodity manufacturing equipment.

Semiconductor process control
Wafer inspection systems
KLA's wafer-inspection systems identify patterned and unpatterned defects, particles, contamination and other process excursions on semiconductor wafers. Optical and other inspection methods allow manufacturers to monitor critical layers, compare defect populations and investigate yield loss during development and high-volume production. The portfolio serves advanced logic and memory as well as mature-node, power, MEMS and specialty-device manufacturing.
Semiconductor process control
Reticle and photomask inspection systems
Reticle and photomask inspection systems detect defects and pattern-placement problems in the masks used to print circuit designs onto wafers. Because a mask defect can be repeated across many dies, inspection is an important upstream control point. KLA's offerings support mask shops, integrated-device manufacturers and advanced lithography processes, including applications associated with increasingly complex patterning and EUV-era manufacturing.
Semiconductor metrology
Metrology systems
KLA metrology products measure characteristics such as critical dimensions, overlay, film thickness, wafer shape, surface properties and other process variables. These measurements help engineers verify whether each manufacturing step remains within specification and connect dimensional variation with eventual device performance. The portfolio reflects the combined heritage of KLA inspection and Tencor measurement technologies.
Inspection and analysis
Defect review and classification systems
Defect-review systems provide higher-resolution examination of defects discovered by inspection tools. They help users classify defect types, distinguish nuisance signals from yield-limiting problems and trace root causes to particular process tools or materials. KLA combines review hardware with software, image management, machine learning and statistical analysis to support faster excursion diagnosis.
Industrial software
Process-control and yield-management software
KLA's software aggregates inspection and metrology data, manages defect information, supports advanced process control and helps manufacturers analyze yield trends. Applications include data visualization, defect classification, process modeling, lithography analysis, statistical process control and computational techniques. The software layer connects individual tools to broader fab-control workflows and is central to KLA's value proposition beyond hardware.
Specialty semiconductor process
SPTS specialty semiconductor process equipment
SPTS, acquired through Orbotech, supplies specialty wafer-processing equipment including etch, physical vapor deposition, chemical vapor deposition and molecular vapor deposition systems. These tools serve markets such as MEMS, advanced packaging, LEDs, compound semiconductors, high-speed RF devices and power-management components. The business complements KLA's inspection and metrology portfolio with selected process-enabling equipment.
PCB and component inspection
Orbotech PCB and component inspection systems
Orbotech-origin systems inspect, test, measure and image printed circuit boards, displays, advanced packages and other electronic components. The portfolio supports manufacturers as designs become denser and production moves toward more complex packaging and electronics assemblies. It expands KLA's addressable market beyond front-end wafer fabrication into electronics manufacturing and component quality control.
Automotive semiconductor quality · 2021
Automotive chip inspection and I-PAT solutions
KLA's automotive-focused portfolio includes patterned and unpatterned wafer inspection systems and I-PAT, an inline defect part-average-testing solution. These products are designed to identify defect populations and screen potentially unreliable die before chips enter the automotive supply chain. The offering addresses the industry's emphasis on traceability, outgoing quality, reliability and zero-defect manufacturing strategies.

Controversies

2007
Stock-option backdating investigation and accounting allegations
The U.S. Securities and Exchange Commission charged KLA-Tencor and former chief executive Kenneth L. Schroeder over allegations that stock-option grants had been improperly backdated. The SEC alleged that the practice concealed more than $200 million in stock-option compensation and caused materially misleading financial disclosures. The company subsequently settled related securities litigation for $65 million in 2008.
Source

2021
Launch automotive semiconductor inspection portfolioProduct launch
Background
Automotive electrification, connectivity and advanced-driver-assistance systems increased demand for semiconductor reliability and stricter outgoing-quality controls.
Action taken
KLA launched the 8935, C205, Surfscan SP A2/A3 and I-PAT products for automotive-chip inspection and screening applications.
Aftermath
The launch positioned KLA's inspection, analytics and inline-screening technologies for automotive semiconductor qualification and zero-defect manufacturing initiatives.
Source
2019
Rebrand KLA-Tencor as KLA CorporationStrategy
Background
After the Orbotech acquisition, the company had a larger and more diversified set of businesses than the KLA-Tencor name directly represented.
Action taken
KLA-Tencor announced a corporate name change to KLA Corporation, effective in July 2019.
Aftermath
The KLA name became the umbrella identity for semiconductor process control, specialty semiconductor process and PCB and component inspection activities.
Source
2019
Acquire Qoniac GmbHM&A
Background
KLA identified process-control software and computational capabilities as important complements to inspection and metrology hardware.
Action taken
KLA acquired Qoniac GmbH, a German software company specializing in semiconductor process-control software.
Aftermath
The acquisition expanded KLA's software and computational process-control capabilities.
Total purchase consideration. $94.0 million, with potential additional consideration tied to revenue milestones (Fiscal 2020 acquisition accounting)
Source
2018
Agree to acquire OrbotechM&A
Background
KLA sought to expand beyond traditional semiconductor wafer process control into printed circuit boards, displays, advanced packaging and specialty semiconductor process equipment.
Action taken
KLA announced an agreement to acquire Orbotech, including its SPTS specialty-process business.
Aftermath
The transaction closed on February 20, 2019 and materially broadened KLA's electronics-manufacturing and specialty-semiconductor portfolio.
Total purchase consideration. Approximately $3.26 billion (Acquisition completed February 20, 2019)
Source
1997
Merge KLA Instruments and Tencor InstrumentsM&A
Background
Both companies supplied complementary inspection, metrology and yield-management technologies to semiconductor manufacturers. Combining them was intended to create a broader source of process-control and diagnostic equipment.
Action taken
The companies merged in April 1997 to form KLA-Tencor Corporation.
Aftermath
The merger created the corporate platform from which KLA expanded into integrated inspection, metrology, analytics, software and services.
Source

Recent events

2021-06-22
KLA launches four automotive chip manufacturing products[10]KLA推出四款汽车芯片制造产品prnewswire.com
Reported: 2021-06-22
KLA announced the launch of four products for automotive chip manufacturing: the 8935 and C205 patterned wafer inspection systems, Surfscan SP A2/A3 unpatterned wafer inspection systems, and I-PAT inline screening solution.
2021-03-31
KLA receives Intel 2020 Supplier Achievement Award[11]KLA获得英特尔2020年度供应商成就奖prnewswire.com
Reported: 2021-03-31
KLA announced that it had received Intel's 2020 Supplier Achievement Award in Technology.
Unconfirmed
KLA joins YouGov's global partnerships programme in South Africa[12]KLA加入YouGov全球合作伙伴计划research-live.com
South African market research agency KLA joined YouGov’s global partnerships programme. The agreement gives KLA access to YouGov intellectual property, platforms, product knowledge and research insights, including YouGov Profiles, YouGov BrandIndex and the YouGov Cube.
2020-09-21
KLA appoints MaryBeth Wilkinson as chief legal officer[13]KLA任命MaryBeth Wilkinson为首席法务官prnewswire.com
Reported: 2020-09-21
KLA announced the appointment of MaryBeth Wilkinson as executive vice president, chief legal officer and corporate secretary. She will lead the company's legal and compliance organization.
2020-07-21
KLA announces eSL10 wafer defect inspection system[14]KLA 宣布推出 eSL10 晶圆缺陷检测系统tech.sina.com.cn
Reported: 2020-07-21
KLA announced the eSL10 electron-beam patterned wafer defect inspection system, designed to detect defects that conventional optical or other electron-beam inspection platforms cannot capture.

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