KLA is one of the largest semiconductor wafer fabrication equipment, or WFE, manufacturers in the world. It specializes in the market segment of semiconductor process control, wherein machines inspect semiconductor wafers during research and development and manufacturing for defects and verify precise measurements. In this section of the market, KLA holds a majority share. It also has a small exposure to the etch and deposition segments of the WFE market. It counts as top customers the largest chipmakers in the world, including TSMC and Samsung.
KLAC Form 4 activity by transaction type, last 90 days
Form 4 transaction type
Transactions
Shares
Total value
Open-market sale
13
334,445
$65.35M
Grant or award
17
983,320
Tax withholding / forfeiture
41
572,351
Dollar totals cover purchases and sales only (codes P and S). Grants, option exercises, gifts and tax withholding are counted in shares, because none of them is a trade at a market price.
KLAC insider transactions (Form 4)
65
104 Form 4 filings on record, the earliest from Nov 8, 2024, newest first. Filing history page 1 of 3.
Footnote F1 (shares): On August 7, 2025, the Reporting Person was granted restricted stock units ("RSUs") of shares of KLA common stock. On August 7, 2026, twenty-five percent (25%) of the RSUs vested. Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at… Full note on SEC EDGAR
Footnote F1 (shares): On August 7, 2025, the Reporting Person was granted restricted stock units ("RSUs") of shares of KLA common stock. On August 7, 2026, twenty-five percent (25%) of the RSUs vested. Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at… Full note on SEC EDGAR
Footnote F1 (shares): On August 7, 2025, the Reporting Person was granted restricted stock units ("RSUs") of shares of KLA common stock. On August 7, 2026, twenty-five percent (25%) of the RSUs vested. Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at… Full note on SEC EDGAR
Footnote F3 (shares): This sale was effected pursuant to the terms of a Rule 10b5-1 trading plan adopted by the Reporting Person on February 2, 2026.
Footnote F1 (shares): On August 7, 2025, the Reporting Person was granted restricted stock units ("RSUs") of shares of KLA common stock. On August 7, 2026, twenty-five percent (25%) of the RSUs vested. Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at… Full note on SEC EDGAR
Footnote F1 (shares): On August 7, 2025, the Reporting Person was granted restricted stock units ("RSUs") of shares of KLA common stock. On August 7, 2026, twenty-five percent (25%) of the RSUs vested. Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at… Full note on SEC EDGAR
Footnote F1 (shares): On August 7, 2025, the Reporting Person was granted restricted stock units ("RSUs") of shares of KLA common stock. On August 7, 2026, twenty-five percent (25%) of the RSUs vested. Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at… Full note on SEC EDGAR
Footnote F3 (shares): This sale was effected pursuant to the terms of a Rule 10b5-1 trading plan adopted by the Reporting Person on February 18, 2026.
Footnote F1 (shares): On August 5, 2026, the Reporting Person received a grant of RSUs. The RSUs vest 25% annually from the date of grant.
Footnote F3 (shares): On August 3, 2023, in addition to the restricted stock units ("RSUs") granted that were subject to only service-based vesting conditions, the Reporting Person was also granted RSUs with both performance-based and service-based vesting conditions ("PRSUs") for a target number of… Full note on SEC EDGAR
Footnote F5 (shares): Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at vesting to cover required tax withholding. The fair market value of KLA common stock used for purposes of calculating the number of shares to be withheld was the closing price of KLA… Full note on SEC EDGAR
Footnote F7 (shares): On August 4, 2022, the Reporting Person was granted PRSUs divided into three tranches. On August 6, 2026, KLA's Board of Directors and Compensation and Talent Committee determined that the performance conditions applicable to the third tranche of these PRSUs were satisfied. On… Full note on SEC EDGAR
Footnote F1 (shares): On August 6, 2026, the Reporting Person received a grant of RSUs. The RSUs vest 25% annually from the date of grant.
Footnote F3 (shares): On August 3, 2023, in addition to the restricted stock units ("RSUs") granted that were subject to only service-based vesting conditions, the Reporting Person was also granted RSUs with both performance-based and service-based vesting conditions ("PRSUs") for a target number of… Full note on SEC EDGAR
Footnote F5 (shares): Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at vesting to cover required tax withholding. The fair market value of KLA common stock used for purposes of calculating the number of shares to be withheld was the closing price of KLA… Full note on SEC EDGAR
Footnote F7 (shares): On August 4, 2022, the Reporting Person was granted PRSUs divided into three tranches. On August 6, 2026, KLA's Board of Directors and Compensation and Talent Committee determined that the performance conditions applicable to the third tranche of these PRSUs were satisfied. On… Full note on SEC EDGAR
Footnote F1 (shares): On August 5, 2026, the Reporting Person received a grant of RSUs. The RSUs vest 25% annually from the date of grant.
Footnote F3 (shares): On August 3, 2023, in addition to the restricted stock units ("RSUs") granted that were subject to only service-based vesting conditions, the Reporting Person was also granted RSUs with both performance-based and service-based vesting conditions ("PRSUs") for a target number of… Full note on SEC EDGAR
Footnote F5 (shares): Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at vesting to cover required tax withholding. The fair market value of KLA common stock used for purposes of calculating the number of shares to be withheld was the closing price of KLA… Full note on SEC EDGAR
Footnote F1 (shares): On August 5, 2026, the Reporting Person received a grant of RSUs. The RSUs vest 25% annually from the date of grant.
Footnote F3 (shares): On August 3, 2023, in addition to the restricted stock units ("RSUs") granted that were subject to only service-based vesting conditions, the Reporting Person was also granted RSUs with both performance-based and service-based vesting conditions ("PRSUs") for a target number of… Full note on SEC EDGAR
Footnote F5 (shares): Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at vesting to cover required tax withholding. The fair market value of KLA common stock used for purposes of calculating the number of shares to be withheld was the closing price of KLA… Full note on SEC EDGAR
Footnote F7 (shares): On August 4, 2022, the Reporting Person was granted PRSUs divided into three tranches. On August 6, 2026, KLA's Board of Directors and Compensation and Talent Committee determined that the performance conditions applicable to the third tranche of these PRSUs were satisfied. On… Full note on SEC EDGAR
Footnote F1 (shares): On August 5, 2026, the Reporting Person received a grant of RSUs. The RSUs vest 25% annually from the date of grant.
Footnote F3 (shares): On August 3, 2023, in addition to the restricted stock units ("RSUs") granted that were subject to only service-based vesting conditions, the Reporting Person was also granted RSUs with both performance-based and service-based vesting conditions ("PRSUs") for a target number of… Full note on SEC EDGAR
Footnote F5 (shares): Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at vesting to cover required tax withholding. The fair market value of KLA common stock used for purposes of calculating the number of shares to be withheld was the closing price of KLA… Full note on SEC EDGAR
Footnote F7 (shares): On August 4, 2022, the Reporting Person was granted PRSUs divided into three tranches. On August 6, 2026, KLA's Board of Directors and Compensation and Talent Committee determined that the performance conditions applicable to the third tranche of these PRSUs were satisfied. On… Full note on SEC EDGAR
Footnote F1 (shares): On August 3, 2023, in addition to the restricted stock units ("RSUs") granted that were subject to only service-based vesting conditions, the Reporting Person was also granted RSUs with both performance-based and service-based vesting conditions ("PRSUs") for a target number of… Full note on SEC EDGAR
Footnote F3 (shares): Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at vesting to cover required tax withholding. The fair market value of KLA common stock used for purposes of calculating the number of shares to be withheld was the closing price of KLA… Full note on SEC EDGAR
Footnote F5 (shares): On August 4, 2022, the Reporting Person was granted PRSUs divided into three tranches. On August 6, 2026, KLA's Board of Directors and Compensation and Talent Committee determined that the performance conditions applicable to the third tranche of these PRSUs were satisfied. On… Full note on SEC EDGAR
Footnote F7 (shares): On August 6, 2026, the Reporting Person received a grant of RSUs. The RSUs vest 25% annually from the date of grant.
Footnote F1 (shares): On August 4, 2022, the Reporting Person was granted restricted stock units ("RSUs") of shares of KLA common stock. On August 4, 2026, twenty-five percent (25%) of the RSUs vested. Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at… Full note on SEC EDGAR
Footnote F3 (shares): On August 4, 2022, in addition to the RSUs granted that were subject to only service-based vesting conditions, the Reporting Person was also granted RSUs with both performance-based and service-based vesting conditions ("PRSUs") for a target number of shares of KLA common stock… Full note on SEC EDGAR
Footnote F5 (shares): This sale was effected pursuant to the terms of a Rule 10b5-1 trading plan adopted by the Reporting Person on February 2, 2026.
Footnote F1 (shares): On August 4, 2022, the Reporting Person was granted restricted stock units ("RSUs") of shares of KLA common stock. On August 4, 2026, twenty-five percent (25%) of the RSUs vested. Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at… Full note on SEC EDGAR
Footnote F3 (shares): On August 4, 2022, in addition to the RSUs granted that were subject to only service-based vesting conditions, the Reporting Person was also granted RSUs with both performance-based and service-based vesting conditions ("PRSUs") for a target number of shares of KLA common stock… Full note on SEC EDGAR
Footnote F5 (shares): This sale was effected pursuant to the terms of a Rule 10b5-1 trading plan adopted by the Reporting Person on February 18, 2026.
Footnote F1 (shares): On August 4, 2022, the Reporting Person was granted restricted stock units ("RSUs") of shares of KLA common stock. On August 4, 2026, twenty-five percent (25%) of the RSUs vested. Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at… Full note on SEC EDGAR
Footnote F3 (shares): On August 4, 2022, in addition to the RSUs granted that were subject to only service-based vesting conditions, the Reporting Person was also granted RSUs with both performance-based and service-based vesting conditions ("PRSUs") for a target number of shares of KLA common stock… Full note on SEC EDGAR
Footnote F1 (shares): On August 4, 2022, the Reporting Person was granted restricted stock units ("RSUs") of shares of KLA common stock. On August 4, 2026, twenty-five percent (25%) of the RSUs vested. Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at… Full note on SEC EDGAR
Footnote F3 (shares): On August 4, 2022, in addition to the RSUs granted that were subject to only service-based vesting conditions, the Reporting Person was also granted RSUs with both performance-based and service-based vesting conditions ("PRSUs") for a target number of shares of KLA common stock… Full note on SEC EDGAR
Footnote F1 (shares): On August 4, 2022, the Reporting Person was granted restricted stock units ("RSUs") of shares of KLA common stock. On August 4, 2026, twenty-five percent (25%) of the RSUs vested. Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at… Full note on SEC EDGAR
Footnote F3 (shares): On August 4, 2022, in addition to the RSUs granted that were subject to only service-based vesting conditions, the Reporting Person was also granted RSUs with both performance-based and service-based vesting conditions ("PRSUs") for a target number of shares of KLA common stock… Full note on SEC EDGAR
Footnote F1 (shares): On August 4, 2022, the Reporting Person was granted restricted stock units ("RSUs") of shares of KLA common stock. On August 4, 2026, twenty-five percent (25%) of the RSUs vested. Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at… Full note on SEC EDGAR
Footnote F3 (shares): On August 4, 2022, in addition to the RSUs granted that were subject to only service-based vesting conditions, the Reporting Person was also granted RSUs with both performance-based and service-based vesting conditions ("PRSUs") for a target number of shares of KLA common stock… Full note on SEC EDGAR
Footnote F1 (shares): On August 1, 2024, the Reporting Person was granted restricted stock units ("RSUs") of shares of KLA common stock. On August 1, 2026, twenty-five percent (25%) of the RSUs vested. Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at… Full note on SEC EDGAR
Footnote F3 (shares): On August 3, 2023, the Reporting Person was granted RSUs of shares of KLA common stock. On August 3, 2026, twenty-five percent (25%) of the RSUs vested. Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at vesting to cover required tax… Full note on SEC EDGAR
Footnote F1 (shares): On August 1, 2024, the Reporting Person was granted restricted stock units ("RSUs") of shares of KLA common stock. On August 1, 2026, twenty-five percent (25%) of the RSUs vested. Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at… Full note on SEC EDGAR
Footnote F3 (shares): On August 3, 2023, the Reporting Person was granted RSUs of shares of KLA common stock. On August 3, 2026, twenty-five percent (25%) of the RSUs vested. Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at vesting to cover required tax… Full note on SEC EDGAR
Footnote F1 (shares): On August 1, 2024, the Reporting Person was granted restricted stock units ("RSUs") of shares of KLA common stock. On August 1, 2026, twenty-five percent (25%) of the RSUs vested. Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at… Full note on SEC EDGAR
Footnote F3 (shares): On August 3, 2023, the Reporting Person was granted RSUs of shares of KLA common stock. On August 3, 2026, twenty-five percent (25%) of the RSUs vested. Pursuant to the terms of the grant, shares of KLA common stock were automatically withheld at vesting to cover required tax… Full note on SEC EDGAR
An insider files Form 144 before selling restricted or control stock. It announces a planned sale. If the sale goes ahead, it shows up later on a Form 4.
KLA CORP (KLAC) had 33 insider filings in the last 90 days, with the most recent on 2026-09-16. The full record for KLAC runs to 104 Form 4 filings, the earliest from 2024-11-08. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying KLAC stock?
No insider purchases of KLAC were filed in the last 90 days.
How many insiders are selling KLAC stock?
13 insider sales of KLAC were filed in the last 90 days, totaling $65.35M.
Where can I see KLAC SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects KLAC Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
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House of Representatives Periodic Transaction Reports from 2024. Senate filings are not included yet. The full history of KLAC beside its insider purchases is in the Congress Tracker.
Michael A. RulliRepublican, OH-06
