Keysight Technologies, Inc.
MX ˙ BMV ˙ US49338L1035
SecurityMX:KEYS / Keysight Technologies, Inc.
InstitutionPrimecap Management Co/ca/
Latest Disclosed Ownership590,825 shares
Latest Disclosed Value $ 166,831,257
Primecap Management Co/ca/ reports 0.30% decrease in ownership of KEYS / Keysight Technologies, Inc.

On May 11, 2026 - Primecap Management Co/ca/ filed a 13F-HR form disclosing ownership of 590,825 shares of Keysight Technologies, Inc. (MX:KEYS) valued at $166,831,257 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 592,605 shares of Keysight Technologies, Inc.. This represents a change in shares of -0.30% during the quarter.

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)
2026-05-11 2026-03-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 590,825 -1,780 -0.30 166,831 38.55 0.1314
2026-02-11 2025-12-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 592,605 -14,090 -2.32 120,411 13.46 0.0911
2025-11-12 2025-09-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 606,695 -31,120 -4.88 106,123 1.54 0.0813
2025-08-11 2025-06-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 637,815 -31,820 -4.75 104,512 4.21 0.0828
2025-05-09 2025-03-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 669,635 -17,640 -2.57 100,291 -9.15 0.0829
2025-02-10 2024-12-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 687,275 -14,960 -2.13 110,397 -1.08 0.0855
2024-11-08 2024-09-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 702,235 -42,890 -5.76 111,606 9.53 0.0821
2024-08-09 2024-06-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 745,125 -12,350 -1.63 101,896 -13.98 0.0738
2024-05-14 2024-03-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 757,475 -5,805 -0.76 118,454 -2.45 0.0883
2024-02-09 2023-12-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 763,280 -17,020 -2.18 121,430 17.62 0.0961
2023-11-13 2023-09-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 780,300 -61,405 -7.30 103,241 -26.75 0.0871
2023-08-11 2023-06-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 841,705 -49,580 -5.56 140,944 -2.07 0.1178
2023-05-15 2023-03-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 891,285 -64,000 -6.70 143,925 -11.93 0.1255
2023-02-13 2022-12-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 955,285 -103,580 -9.78 163,421 -1.92 0.1496
2022-11-14 2022-09-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 1,058,865 -29,595 -2.72 166,623 11.05 0.1612
2022-08-11 2022-06-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 1,088,460 -115,915 -9.62 150,044 -21.14 0.1341
2022-05-11 2022-03-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 1,204,375 -175,845 -12.74 190,255 -33.25 0.1435
2022-02-11 2021-12-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 1,380,220 -110,050 -7.38 285,029 16.42 0.1973
2021-11-12 2021-09-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 1,490,270 -23,225 -1.53 244,836 4.77 0.1728
2021-08-10 2021-06-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 1,513,495 -79,890 -5.01 233,699 2.28 0.1570
2021-05-14 2021-03-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 1,593,385 -441,575 -21.70 228,491 -15.00 0.1593
2021-02-08 2020-12-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 2,034,960 -124,900 -5.78 268,798 25.99 0.1998
2020-11-13 2020-09-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 2,159,860 -187,930 -8.00 213,351 -9.83 0.1760
2020-08-13 2020-06-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 2,347,790 -180,175 -7.13 236,610 11.85 0.2030
2020-05-14 2020-03-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 2,527,965 -419,885 -14.24 211,540 -30.08 0.2074
2020-02-14 2019-12-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 2,947,850 -17,320 -0.58 302,538 4.92 0.2194
2019-11-13 2019-09-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 2,965,170 -526,625 -15.08 288,363 -8.05 0.2306
2019-08-14 2019-06-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 3,491,795 -423,656 -10.82 313,598 -8.15 0.2319
2019-05-14 2019-03-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 3,915,451 -125,454 -3.10 341,427 36.10 0.2513
2019-02-12 2018-12-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 4,040,905 -1,067,240 -20.89 250,859 -25.91 0.2033
2018-11-13 2018-09-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 5,108,145 -89,750 -1.73 338,568 10.34 0.2285
2018-08-13 2018-06-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 5,197,895 -13,610 -0.26 306,832 12.38 0.2275
2018-05-14 2018-03-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 5,211,505 -56,000 -1.06 273,031 24.60 0.2049
2018-02-13 2017-12-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 5,267,505 -46,270 -0.87 219,128 -1.01 0.1682
2017-11-13 2017-09-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 5,313,775 -177,920 -3.24 221,372 3.55 0.1832
2017-08-11 2017-06-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 5,491,695 -40,715 -0.74 213,792 6.93 0.1837
2017-05-12 2017-03-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 5,532,410 -73,434 -1.31 199,941 -2.47 0.1815
2017-02-13 2016-12-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 5,605,844 -1,123,383 -16.69 205,006 -3.87 0.2017
2016-11-14 2016-09-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 6,729,227 -145,550 -2.12 213,249 6.63 0.2128
2016-08-12 2016-06-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 6,874,777 33,200 0.49 199,987 5.38 0.2129
2016-05-12 2016-03-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 6,841,577 808,096 13.39 189,785 11.03 0.1968
2016-02-12 2015-12-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 6,033,481 419,442 7.47 170,929 -1.28 0.1748
2015-11-12 2015-09-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 5,614,039 -107,300 -1.88 173,137 -2.98 0.1922
2015-08-13 2015-06-30 13F KEYSIGHT TECHNOLOGIES COM 49338L103 5,721,339 284,464 5.23 178,449 -11.65 0.1755
2015-05-14 2015-03-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 5,436,875 252,063 4.86 201,980 15.36 0.1972
2015-02-12 2014-12-31 13F KEYSIGHT TECHNOLOGIES COM 49338L103 5,184,812 5,184,812 175,091 0.1774
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.