Khan Ahmad A.

SEC source: 0001209191-23-034257 · doc4.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 54,997

F1 · balance_after: The number of shares of KLA common stock includes 46,227 shares issuable upon vesting of restricted stock units ("RSUs").

SEC source: 0001209191-23-030589 · doc4.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 55,172

F1 · shares: This sale was effected pursuant to the terms of a Rule 10b5-1 trading plan adopted by the Reporting Person on November 29, 2022.

F2 · balance_after: The number of shares of KLA common stock includes 46,227 shares issuable upon vesting of restricted stock units ("RSUs").

SEC source: 0001209191-23-020484 · doc4.xml · nonDerivative · entry 3

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 57,087

F3 · shares: This sale was effected pursuant to the terms of a Rule 10b5-1 trading plan adopted by the Reporting Person on November 29, 2022.

F2 · balance_after: Includes RSUs to acquire 46,227 shares of KLA common stock.

SEC source: 0001209191-23-020484 · doc4.xml · nonDerivative · entry 2

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 59,002

F3 · shares: This sale was effected pursuant to the terms of a Rule 10b5-1 trading plan adopted by the Reporting Person on November 29, 2022.

F2 · balance_after: Includes RSUs to acquire 46,227 shares of KLA common stock.

SEC source: 0001209191-23-020484 · doc4.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 62,833

F1 · shares: Pursuant to the terms of the grant of restricted stock units ("RSUs") on March 19, 2019, 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 common stock as reported on March 20, 2023.

F2 · balance_after: Includes RSUs to acquire 46,227 shares of KLA common stock.

SEC source: 0001209191-23-010032 · doc4.xml · nonDerivative · entry 2

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 70,195

F1 · shares: This sale was effected pursuant to the terms of a Rule 10b5-1 trading plan adopted by the Reporting Person on November 29, 2022.

F2 · balance_after: The number of shares of KLA common stock includes 61,422 shares issuable upon vesting of restricted stock units ("RSUs").

SEC source: 0001209191-23-010032 · doc4.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 73,093

F1 · shares: This sale was effected pursuant to the terms of a Rule 10b5-1 trading plan adopted by the Reporting Person on November 29, 2022.

F2 · balance_after: The number of shares of KLA common stock includes 61,422 shares issuable upon vesting of restricted stock units ("RSUs").

SEC source: 0001209191-22-047831 · doc4.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 74,059

F1 · shares: This sale was effected pursuant to the terms of a Rule 10b5-1 trading plan adopted by the Reporting Person on August 2, 2022.

F2 · balance_after: The number of shares of KLA common stock includes 61,422 shares issuable upon vesting of restricted stock units ("RSUs").

SEC source: 0001209191-22-047698 · doc4.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 77,927

F1 · shares: This sale was effected pursuant to the terms of a Rule 10b5-1 trading plan adopted by the Reporting Person on August 2, 2022.

F2 · balance_after: The number of shares of KLA common stock includes 61,422 shares issuable upon vesting of restricted stock units ("RSUs").

SEC source: 0001209191-22-044970 · doc4.xml · nonDerivative · entry 2

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 85,663

F3 · shares: On August 6, 2020, the Reporting Person was granted RSUs for 9,444 shares of KLA common stock. On August 6, 2022, 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 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 common stock as reported on August 5, 2022.

F4 · balance_after: The number of shares of KLA common stock includes 61,422 shares issuable upon vesting of RSUs.

SEC source: 0001209191-22-044970 · doc4.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 86,834

F1 · shares: On August 5, 2021, the Reporting Person was granted restricted stock units ("RSUs") for 6,727 shares of KLA common stock. On August 5, 2022, 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 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 common stock as reported on August 5, 2022.

F2 · balance_after: The number of shares of KLA common stock includes 63,783 shares issuable upon vesting of RSUs.

SEC source: 0001209191-22-044764 · doc4.xml · nonDerivative · entry 3

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 87,668

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 common stock as reported on August 4, 2022.

F4 · balance_after: The number of shares of KLA common stock includes 65,465 shares issuable upon vesting of RSUs.

SEC source: 0001209191-22-044764 · doc4.xml · nonDerivative · entry 2

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 93,249

F3 · shares: On August 1, 2019, in addition to the RSUs granted on that date that were subject only to service-vesting requirements (which RSUs were previously reported on a Form 4), the Reporting Person was also granted RSUs covering up to a maximum of 22,510 shares (based on 150% of the target shares of 15,007) of KLA common stock, subject to both performance-vesting and service-vesting requirements. On August 4, 2022, the Compensation and Talent Committee of KLA's Board of Directors determined the level at which the corporate performance goals were attained and, based on the assessment, determined that the number of shares subject to the RSUs is 22,510.

F4 · balance_after: The number of shares of KLA common stock includes 65,465 shares issuable upon vesting of RSUs.

SEC source: 0001209191-22-044764 · doc4.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 70,739

F1 · shares: On August 4, 2022, the Reporting Person received a grant of restricted stock units ("RSUs"). The RSUs vest 25% annually from the date of grant.

F2 · balance_after: The number of shares of KLA common stock includes 54,211 shares issuable upon vesting of RSUs.

SEC source: 0001209191-22-044404 · doc4.xml · nonDerivative · entry 2

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 64,479

F3 · shares: On August 2, 2018, the Reporting Person was granted RSUs for 12,645 shares of KLA common stock. On August 2, 2022, the remaining 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 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 common stock as reported on August 2, 2022.

F4 · balance_after: The number of shares of KLA common stock includes 47,951 shares issuable upon vesting of RSUs.

SEC source: 0001209191-22-044404 · doc4.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 66,047

F1 · shares: The Reporting Person vested the remaining 50% of the performance-based restricted stock units ("RSUs"), upon his completion of four years of service (August 2, 2022) following the award on August 2, 2018. The Compensation Committee of KLA's Board of Directors determined the level at which the underlying performance goals were attained (August 5, 2021). 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 common stock as reported on August 2, 2022.

F2 · balance_after: The number of shares of KLA common stock includes 51,112 shares issuable upon vesting of RSUs.

SEC source: 0001209191-22-044163 · doc4.xml · nonDerivative · entry 2

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 70,248

F4 · shares: Pursuant to the terms of the grant of restricted stock units ("RSUs") on August 1, 2019, 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 common stock as reported on August 1, 2022.

F5 · balance_after: The number of shares of KLA common stock includes 59,584 shares issuable upon vesting of RSUs.

SEC source: 0001209191-22-044163 · doc4.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 72,109

F1 · shares: Purchased under the registrant's employee stock purchase plan.

F2 · price: Represents 85% of the closing price of the registrant's stock on the employee stock purchase plan on June 30, 2022.

F3 · balance_after: The number of shares of KLA common stock includes 63,336 shares issuable upon vesting of RSUs.

SEC source: 0001628280-22-006898 · wf-form4_164798056570825.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 72,052

F1 · shares: Pursuant to the terms of the restricted stock unit ("RSU") grant by the registrant on March 20, 2019, shares of KLA common stock were automatically withheld to cover required tax withholding on the 15,195 shares of KLA common stock that vested. 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 common stock as reported on March 18, 2022.

F2 · balance_after: Includes RSUs to acquire 63,336 shares of KLA common stock.

SEC source: 0001628280-21-024002 · wf-form4_163762150498049.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 79,586

F1 · shares: This sale was effected pursuant to the terms of a Rule 10b5-1 trading plan adopted by the Reporting Person on August 4, 2021.

F2 · balance_after: The number of shares of KLA common stock includes 78,531 shares issuable upon vesting of RSUs.

SEC source: 0001628280-21-021467 · wf-form4_163597042557148.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 80,471

F1 · shares: Pursuant to the terms of the grant of restricted stock units ("RSUs") on November 1, 2017, 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 common stock as reported on November 1, 2021.

F2 · balance_after: The number of shares of KLA common stock includes 78,531 shares issuable upon vesting of RSUs.

SEC source: 0001628280-21-017736 · wf-form4_163009789870045.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,055

F1 · shares: This sale was effected pursuant to the terms of a Rule 10b5-1 trading plan adopted by the Reporting Person on August 4, 2021.

SEC source: 0001628280-21-016669 · wf-form4_162872436641340.xml · nonDerivative · entry 3

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,861

F4 · 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 common stock as reported on August 6, 2021.

SEC source: 0001628280-21-016669 · wf-form4_162872436641340.xml · nonDerivative · entry 2

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,032

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: On August 6, 2020, the Reporting Person was granted RSUs for 9,444 shares of KLA common stock. On August 6, 2021, 25% of the RSUs vested.

SEC source: 0001628280-21-016669 · wf-form4_162872436641340.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 80,288

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Each restricted stock unit ("RSU") represents a contingent right to receive one share of KLA common stock.

F2 · shares: On August 6, 2020, the Reporting Person was granted RSUs for 9,444 shares of KLA common stock. On August 6, 2021, 25% of the RSUs vested.

F3 · balance_after: Does not include performance-based RSUs, if any, held by the Reporting Person for which an assessment has not yet been made regarding the achievement of the applicable performance goals. Any such holdings will be reported on a Form 4 within two business days of the date such assessment is made.

SEC source: 0001628280-21-016245 · wf-form4_162854021290933.xml · nonDerivative · entry 5

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,501

F6 · 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 ofcalculating the number of shares to be withheld was the closing price of KLA common stock as reported on August 5, 2021.

SEC source: 0001628280-21-016245 · wf-form4_162854021290933.xml · nonDerivative · entry 4

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,702

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · shares: The Reporting Person vested fifty percent (50%) of the performance-based RSUs upon the date on which the Compensation Committee of KLA's Board of Directors determined the level at which theunderlying performance goals were attained (August 5, 2021) and will vest in the remaining fifty percent (50%) upon his completion of four years of service following the award (August 2, 2022). The shares ofcommon stock will be issued as the performance-based RSUs vest.

SEC source: 0001628280-21-016245 · wf-form4_162854021290933.xml · nonDerivative · entry 3

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 90,308

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Each restricted stock unit ("RSU") represents a contingent right to receive one share of KLA common stock.

F5 · shares: The Reporting Person vested fifty percent (50%) of the performance-based RSUs upon the date on which the Compensation Committee of KLA's Board of Directors determined the level at which theunderlying performance goals were attained (August 5, 2021) and will vest in the remaining fifty percent (50%) upon his completion of four years of service following the award (August 2, 2022). The shares ofcommon stock will be issued as the performance-based RSUs vest.

F3 · balance_after: Does not include performance-based RSUs, if any, held by the Reporting Person for which an assessment has not yet been made regarding the achievement of the applicable performance goals. Any such holdings will be reported on a Form 4 within two business days of the date such assessment is made.

SEC source: 0001628280-21-016245 · wf-form4_162854021290933.xml · nonDerivative · entry 2

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 98,780

F1 · security: Each restricted stock unit ("RSU") represents a contingent right to receive one share of KLA common stock.

F4 · shares: On August 2, 2018, in addition to the RSUs granted on that date that were subject only to service-vesting requirements (which RSUs were previously reported on a Form 4), the Reporting Person was alsogranted RSUs covering up to a maximum of 18,967 shares (based on 150% of the target shares of 12,645) of KLA common stock, subject to both performance-vesting and service-vesting requirements. On August5, 2021, the Compensation Committee of KLA's Board of Directors determined the level at which the corporate performance goals were attained and, based on the assessment, determined that the number ofshares subject to the RSUs is 16,944.

F3 · balance_after: Does not include performance-based RSUs, if any, held by the Reporting Person for which an assessment has not yet been made regarding the achievement of the applicable performance goals. Any such holdings will be reported on a Form 4 within two business days of the date such assessment is made.

SEC source: 0001628280-21-016245 · wf-form4_162854021290933.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 81,836

F1 · security: Each restricted stock unit ("RSU") represents a contingent right to receive one share of KLA common stock.

F2 · shares: On August 5, 2021, the Reporting Person received a grant of RSUs. The RSUs vest 25% annually from the date of grant.

F3 · balance_after: Does not include performance-based RSUs, if any, held by the Reporting Person for which an assessment has not yet been made regarding the achievement of the applicable performance goals. Any such holdings will be reported on a Form 4 within two business days of the date such assessment is made.

SEC source: 0001628280-21-016630 · wf-form4a_162871542188595.xml · nonDerivative · entry 2

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,671

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 common stock as reported on August 5, 2021.

F4 · balance_after: This amendment to Form 4 is being filed to correct an administrative error which incorrectly reported the number of shares of KLA common stock that were beneficially owned by the Reporting Person following this reported transaction on August 5, 2021, and to report the holding for the Reporting Person as 12,671 shares of KLA common stock, instead of 10,501, following the reported transaction.

SEC source: 0001628280-21-016630 · wf-form4a_162871542188595.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,872

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: The Reporting Person vested fifty percent (50%) of the performance-based RSUs upon the date on which the Compensation Committee of KLA's Board of Directors determined the level at which theunderlying performance goals were attained (August 5, 2021) and will vest in the remaining fifty percent (50%) upon his completion of four years of service following the award (August 2, 2022). The shares ofcommon stock will be issued as the performance-based RSUs vest.

F2 · balance_after: This amendment to Form 4 is being filed to correct an administrative error which incorrectly reported the number of shares of KLA common stock that were beneficially owned by the Reporting Person following this reported transaction on August 5, 2021, and to report the holding for the Reporting Person as 16,872 shares of KLA common stock, instead of 14,702, following such transaction.

SEC source: 0001628280-21-016652 · wf-form4a_162872171549752.xml · nonDerivative · entry 5

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,671

F10 · 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 ofcalculating the number of shares to be withheld was the closing price of KLA common stock as reported on August 5, 2021.

F11 · balance_after: This amendment to Form 4 is being filed to correct an administrative error which incorrectly reported the number of shares of KLA common stock that were beneficially owned by the Reporting Person following this reported transaction on August 5, 2021, and to report the holding for the Reporting Person as 12,671 shares of KLA common stock, instead of 10,501, following the reported transaction.

SEC source: 0001628280-21-016652 · wf-form4a_162872171549752.xml · nonDerivative · entry 4

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,872

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F7 · shares: The Reporting Person vested fifty percent (50%) of the performance-based RSUs upon the date on which the Compensation Committee of KLA's Board of Directors determined the level at which theunderlying performance goals were attained (August 5, 2021) and will vest in the remaining fifty percent (50%) upon his completion of four years of service following the award (August 2, 2022). The shares ofcommon stock will be issued as the performance-based RSUs vest.

F9 · balance_after: This amendment to Form 4 is being filed to correct an administrative error which incorrectly reported the number of shares of KLA common stock that were beneficially owned by the Reporting Person following this reported transaction on August 5, 2021, and to report the holding for the Reporting Person as 16,872 shares of KLA common stock, instead of 14,702, following such transaction.

SEC source: 0001628280-21-016652 · wf-form4a_162872171549752.xml · nonDerivative · entry 3

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 82,649

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Each restricted stock unit ("RSU") represents a contingent right to receive one share of KLA common stock.

F7 · shares: The Reporting Person vested fifty percent (50%) of the performance-based RSUs upon the date on which the Compensation Committee of KLA's Board of Directors determined the level at which theunderlying performance goals were attained (August 5, 2021) and will vest in the remaining fifty percent (50%) upon his completion of four years of service following the award (August 2, 2022). The shares ofcommon stock will be issued as the performance-based RSUs vest.

F3 · balance_after: Does not include performance-based RSUs, if any, held by the Reporting Person for which an assessment has not yet been made regarding the achievement of the applicable performance goals. Any such holdings will be reported on a Form 4 within two business days of the date such assessment is made.

F8 · balance_after: This amendment to Form 4 is being filed to correct an administrative error which incorrectly reported the number of RSUs that were beneficially owned by the Reporting Person following this reported transaction on August 5, 2021, and to report the holding for the Reporting Person as 82,649 RSUs, instead of 90,308, following the reported transaction.

SEC source: 0001628280-21-016652 · wf-form4a_162872171549752.xml · nonDerivative · entry 2

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 91,121

F1 · security: Each restricted stock unit ("RSU") represents a contingent right to receive one share of KLA common stock.

F5 · shares: On August 2, 2018, in addition to the RSUs granted on that date that were subject only to service-vesting requirements (which RSUs were previously reported on a Form 4), the Reporting Person was alsogranted RSUs covering up to a maximum of 18,967 shares (based on 150% of the target shares of 12,645) of KLA common stock, subject to both performance-vesting and service-vesting requirements. On August 5, 2021, the Compensation Committee of KLA's Board of Directors determined the level at which the corporate performance goals were attained and, based on the assessment, determined that the number of shares subject to the RSUs is 16,944.

F3 · balance_after: Does not include performance-based RSUs, if any, held by the Reporting Person for which an assessment has not yet been made regarding the achievement of the applicable performance goals. Any such holdings will be reported on a Form 4 within two business days of the date such assessment is made.

F6 · balance_after: This amendment to Form 4 is being filed to correct an administrative error which incorrectly reported the number of RSUs that were beneficially owned by the Reporting Person following this reported transaction on August 5, 2021, and to report the holding for the Reporting Person as 91,121 RSUs, instead of 98,780, following the reported transaction.

SEC source: 0001628280-21-016652 · wf-form4a_162872171549752.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 74,177

F1 · security: Each restricted stock unit ("RSU") represents a contingent right to receive one share of KLA common stock.

F2 · shares: On August 5, 2021, the Reporting Person received a grant of RSUs. The RSUs vest 25% annually from the date of grant.

F3 · balance_after: Does not include performance-based RSUs, if any, held by the Reporting Person for which an assessment has not yet been made regarding the achievement of the applicable performance goals. Any such holdings will be reported on a Form 4 within two business days of the date such assessment is made.

F4 · balance_after: This amendment to Form 4 is being filed to correct an administrative error which incorrectly reported the number of RSUs that were beneficially owned by the Reporting Person following this reported transaction on August 5, 2021, and to report the holding for the Reporting Person as 74,177 RSUs, instead of 81,836, following the reported transaction.

SEC source: 0001628280-21-015884 · wf-form4_162819543375838.xml · nonDerivative · entry 6

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,570

F4 · 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 common stock as reported on August 3, 2021.

SEC source: 0001628280-21-015884 · wf-form4_162819543375838.xml · nonDerivative · entry 5

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 9,485

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · shares: On August 3, 2017, the Reporting Person was granted RSUs for 8,755 shares of KLA common stock. On August 3, 2021, the remaining 25% of the RSUs vested.

SEC source: 0001628280-21-015884 · wf-form4_162819543375838.xml · nonDerivative · entry 4

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 67,450

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Each restricted stock unit ("RSU") represents a contingent right to receive one share of KLA common stock.

F5 · shares: On August 3, 2017, the Reporting Person was granted RSUs for 8,755 shares of KLA common stock. On August 3, 2021, the remaining 25% of the RSUs vested.

F3 · balance_after: Does not include performance-based RSUs, if any, held by the Reporting Person for which an assessment has not yet been made regarding the achievement of the applicable performance goals. Any such holdings will be reported on a Form 4 within two business days of the date such assessment is made.

SEC source: 0001628280-21-015884 · wf-form4_162819543375838.xml · nonDerivative · entry 3

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,297

F4 · 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 common stock as reported on August 3, 2021.

SEC source: 0001628280-21-015884 · wf-form4_162819543375838.xml · nonDerivative · entry 2

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,010

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: The remaining fifty percent (50%) of the performance-based RSUs that were granted to the Reporting Person on August 3, 2017, vested upon his completion of four years of service following the grant of the award.

SEC source: 0001628280-21-015884 · wf-form4_162819543375838.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 69,638

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Each restricted stock unit ("RSU") represents a contingent right to receive one share of KLA common stock.

F2 · shares: The remaining fifty percent (50%) of the performance-based RSUs that were granted to the Reporting Person on August 3, 2017, vested upon his completion of four years of service following the grant of the award.

F3 · balance_after: Does not include performance-based RSUs, if any, held by the Reporting Person for which an assessment has not yet been made regarding the achievement of the applicable performance goals. Any such holdings will be reported on a Form 4 within two business days of the date such assessment is made.

SEC source: 0001628280-21-016237 · wf-form4a_162853955414077.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,400

F1 · kind: This amendment to Form 4 is being filed to correct an administrative error which incorrectly reported the acquisition, instead of the disposition, of shares of KLA common stock that were automatically withheld by the company on August 3, 2021, and to report the holding for the Reporting Person as 8,400 shares of KLA common stock, instead of 10,570, following the reported transaction.

F2 · 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 common stock as reported on August 3, 2021.

F1 · acquired: This amendment to Form 4 is being filed to correct an administrative error which incorrectly reported the acquisition, instead of the disposition, of shares of KLA common stock that were automatically withheld by the company on August 3, 2021, and to report the holding for the Reporting Person as 8,400 shares of KLA common stock, instead of 10,570, following the reported transaction.

F1 · balance_after: This amendment to Form 4 is being filed to correct an administrative error which incorrectly reported the acquisition, instead of the disposition, of shares of KLA common stock that were automatically withheld by the company on August 3, 2021, and to report the holding for the Reporting Person as 8,400 shares of KLA common stock, instead of 10,570, following the reported transaction.

SEC source: 0001628280-21-015569 · wf-form4_162811008354442.xml · nonDerivative · entry 3

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,539

F4 · 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 common stock as reported on August 2, 2021.

SEC source: 0001628280-21-015569 · wf-form4_162811008354442.xml · nonDerivative · entry 2

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,107

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: On August 2, 2018, the Reporting Person was granted RSUs for 12,645 shares of KLA common stock. On August 2, 2021, 25% of the RSUs vested.

SEC source: 0001628280-21-015569 · wf-form4_162811008354442.xml · nonDerivative · entry 1

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,109

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · security: Each restricted stock unit ("RSU") represents a contingent right to receive one share of KLA common stock.

F2 · shares: On August 2, 2018, the Reporting Person was granted RSUs for 12,645 shares of KLA common stock. On August 2, 2021, 25% of the RSUs vested.

F3 · balance_after: Does not include performance-based RSUs, if any, held by the Reporting Person for which an assessment has not yet been made regarding the achievement of the applicable performance goals. Any such holdings will be reported on a Form 4 within two business days of the date such assessment is made.

SEC source: 0001628280-21-015387 · wf-form4_162802581622708.xml · nonDerivative · entry 4

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,946

F6 · 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 common stock as reported on July 30, 2021.

SEC source: 0001628280-21-015387 · wf-form4_162802581622708.xml · nonDerivative · entry 3

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,807

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · shares: On August 1, 2019, the Reporting Person was granted RSUs for 15,007 shares of KLA common stock. On August 1, 2021, 25% of the RSUs vested.

SEC source: 0001628280-21-015387 · wf-form4_162802581622708.xml · nonDerivative · entry 2

Khan Ahmad A. · CIK 0001642452 · President, Semi Proc. Control

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 78,270

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · security: Each restricted stock unit ("RSU") represents a contingent right to receive one share of KLA common stock.

F4 · shares: On August 1, 2019, the Reporting Person was granted RSUs for 15,007 shares of KLA common stock. On August 1, 2021, 25% of the RSUs vested.

F5 · balance_after: Does not include performance-based RSUs, if any, held by the Reporting Person for which an assessment has not yet been made regarding the achievement of the applicable performance goals. Any such holdings will be reported on a Form 4 within two business days of the date such assessment is made.