KLA Corporation
MX ˙ BMV ˙ US4824801009
SecurityMX:KLAC / KLA Corporation
InstitutionParnassus Investments /ca
Latest Disclosed Ownership538,364 shares
Latest Disclosed Value $ 792,692,538
Parnassus Investments /ca reports 13.68% decrease in ownership of KLAC / KLA Corporation

On May 12, 2026 - Parnassus Investments /ca filed a 13F-HR form disclosing ownership of 538,364 shares of KLA Corporation (MX:KLAC) valued at $792,692,538 USD as of March 31, 2026.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-12 2026-03-31 13F KLA COM NEW 482480100 538,364 -85,300 -13.68 792,693 4.60 2.3214
2026-02-12 2025-12-31 13F KLA COM NEW 482480100 623,664 -96,794 -13.44 757,802 -2.48 1.9652
2025-10-24 2025-09-30 13F KLA COM NEW 482480100 720,458 65,398 9.98 777,086 32.44 1.7961
2025-08-06 2025-06-30 13F KLA COM NEW 482480100 655,060 -15,381 -2.29 586,763 28.74 1.3534
2025-05-15 2025-03-31 13F KLA COM NEW 482480100 670,441 -62,887 -8.58 455,766 -1.37 1.0951
2025-02-10 2024-12-31 13F KLA COM NEW 482480100 733,328 580,967 381.31 462,085 291.63 1.0264
2024-11-08 2024-09-30 13F KLA COM NEW 482480100 152,361 -1,206 -0.79 117,990 -6.81 0.2503
2024-08-06 2024-06-30 13F KLA COM NEW 482480100 153,567 -10,066 -6.15 126,618 10.77 0.2758
2024-05-09 2024-03-31 13F KLA COM NEW 482480100 163,633 -136,922 -45.56 114,309 -34.57 0.2443
2024-02-12 2023-12-31 13F KLA COM NEW 482480100 300,555 -7,893 -2.56 174,713 23.50 0.3880
2023-11-08 2023-09-30 13F KLA COM NEW 482480100 308,448 0 0.00 141,473 -5.44 0.3460
2023-07-31 2023-06-30 13F KLA COM NEW 482480100 308,448 -35,440 -10.31 149,603 8.99 0.3473
2023-05-01 2023-03-31 13F KLA COM NEW 482480100 343,888 -95,706 -21.77 137,270 -17.18 0.3402
2023-01-30 2022-12-31 13F KLA COM NEW 482480100 439,594 172,334 64.48 165,740 104.92 0.4118
2022-11-14 2022-09-30 13F KLA COM NEW 482480100 267,260 1,181 0.44 80,881 -4.73 0.2105
2022-08-05 2022-06-30 13F KLA COM NEW 482480100 266,079 -236,074 -47.01 84,900 -53.81 0.2028
2022-05-11 2022-03-31 13F KLA COM NEW 482480100 502,153 -58,381 -10.42 183,818 -23.76 0.3724
2022-02-11 2021-12-31 13F KLA COMMON STOCK 482480100 560,534 -115,957 -17.14 241,091 6.54 0.4626
2021-11-16 2021-09-30 13F/A-1 KLA COMMON STOCK 482480100 676,491 0 0.00 226,293 3.18 0.4772
2021-11-12 2021-09-30 13F KLA COMMON STOCK 482480100 676,491 0 226,293 0.4812
2021-08-05 2021-06-30 13F KLA COMMON STOCK 482480100 676,491 -156,311 -18.77 219,325 -20.29 0.4776
2021-05-06 2021-03-31 13F KLA COMMON STOCK 482480100 832,802 -64,740 -7.21 275,158 18.41 0.6679
2021-02-10 2020-12-31 13F KLA COMMON STOCK 482480100 897,542 -12,888 -1.42 232,383 31.75 0.6304
2020-11-13 2020-09-30 13F KLA COMMON STOCK 482480100 910,430 87,700 10.66 176,387 10.24 0.5472
2020-08-12 2020-06-30 13F KLA COMMON STOCK 482480100 822,730 84,584 11.46 160,005 50.80 0.5537
2020-05-01 2020-03-31 13F KLA-Tencor COMMON STOCK 482480100 738,146 738,146 106,101 0.4415
2018-11-13 2018-09-30 13F KLA-Tencor COMMON STOCK 482480100 0 -1,505,015 -100.00 0 -100.00
2018-08-06 2018-06-30 13F KLA-Tencor COMMON STOCK 482480100 1,505,015 -667,975 -30.74 154,309 -34.86 0.6145
2018-04-30 2018-03-31 13F KLA-Tencor COMMON STOCK 482480100 2,172,990 -1,239,287 -36.32 236,878 -33.93 0.9569
2018-02-05 2017-12-31 13F KLA-Tencor COMMON STOCK 482480100 3,412,277 1,713 0.05 358,528 -0.83 1.4070
2017-11-01 2017-09-30 13F KLA-Tencor COMMON STOCK 482480100 3,410,564 -53,688 -1.55 361,520 14.04 1.4811
2017-08-11 2017-06-30 13F KLA-Tencor COMMON STOCK 482480100 3,464,252 9,177 0.27 317,014 -0.97 1.3365
2017-05-01 2017-03-31 13F KLA-Tencor COMMON STOCK 482480100 3,455,075 6,158 0.18 320,116 17.97 1.4940
2017-02-10 2016-12-31 13F KLA-Tencor COMMON STOCK 482480100 3,448,917 1,769,502 105.36 271,361 131.79 1.3400
2016-11-10 2016-09-30 13F KLA-Tencor COMMON STOCK 482480100 1,679,415 1,679,415 117,072 0.5771
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.