What KLA does
KLA Corporation, headquartered in Milpitas, California, makes inspection and metrology equipment: the tools chipmakers use to find defects and measure features on wafers, photomasks, chips and packaged chips, along with the software and services that go with them.
The industry calls this process control. The tools do not print or etch circuits. They check that every step came out right, so a fab can keep its yield up.
KLA was formed in April 1997 by the merger of KLA Instruments and Tencor Instruments, companies that began in 1975 and 1976. In the fiscal year ended June 30, 2026 it reported revenue of $13.58 billion and net income of $4.83 billion in its annual report, and employed about 17,000 regular full-time people worldwide.
In Arizona
KLA lists two Arizona offices on its locations page:
- Chandler: 444 S. Ellis St.
- Phoenix: 20022 N. 31st Ave.
KLA publishes nothing else about them: no headcount, no size, no opening date and no description of the work. Arizona AI found no announcement of an Arizona lease, expansion, incentive or headcount by KLA, the Arizona Commerce Authority or the cities of Chandler and Phoenix, no KLA entry in the City of Chandler's August 2026 semiconductor industry brochure, and no Arizona WARN notice.
How long it has been here: KLA-Tencor's fiscal 2000 and fiscal 2004 annual reports list a 9,736-square-foot leased Phoenix sales and service office, and its fiscal 2005 and 2006 reports a 5,914-square-foot Chandler office. After that, the filings stopped listing small offices.
What the work is: KLA's Arizona job postings point mostly to field service and customer support at customer sites, and to training for its field engineers in Phoenix. KLA does not say which Arizona fabs its engineers serve. Current openings are in the jobs section of this page.
A closed chapter in Tucson: In October 2006 KLA-Tencor paid about $474 million for ADE Corporation, whose ADE Phase Shift unit made interferometric surface metrology tools in a 60,000-square-foot plant it owned in Tucson. KLA listed the plant for engineering and manufacturing in its fiscal 2007 annual report, marked it available for sale in the 2009 report, and dropped it from the 2010 report. A 2018 trade article noted that KLA-Tencor was by then gone from Tucson. KLA published no closure announcement.
Role in AI and chips
KLA named Taiwan Semiconductor Manufacturing Company as its only customer above 10% of revenue, at about 19%.
KLA ties its growth to artificial intelligence. Its chief executive said in July 2026 that the company "remains uniquely positioned on the critical path of AI infrastructure expansion." Its order backlog rose from $7.86 billion to $12.57 billion in the year to June 2026, on what the company calls the AI infrastructure buildout, and inspection of advanced packages that combine a GPU and high-bandwidth memory is a growing line.
KLA was a platinum sponsor at the first SEMICON West held in Phoenix, in October 2025.
Risks and open questions
- China: 29.8% of fiscal 2026 revenue, down from 42.8% two years earlier.
- Export controls: KLA says U.S. export license denials have harmed its backlog, that some China-bound products have been held by U.S. Customs, and that Chinese controls on rare earth elements cover components it needs.
- Past settlements: it remains bound by settlements of government actions over its historical stock option practices.
Arizona AI found no Arizona layoff notice, lawsuit or incentive award involving KLA as of October 2026, and Arizona AI notes that everything about the size of KLA's Arizona operation remains unpublished.