Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionJanus Henderson Group Plc
Latest Disclosed Ownership9,458,488 shares
Latest Disclosed Value $ 1,195,087,777
Janus Henderson Group Plc reports 4.50% decrease in ownership of APH / Amphenol Corporation

On May 18, 2026 - Janus Henderson Group Plc filed a 13F-HR/A form disclosing ownership of 9,458,488 shares of Amphenol Corporation (US:APH) valued at $1,195,079,959 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 9,904,627 shares of Amphenol Corporation. This represents a change in shares of -4.50% during the quarter. The current value of the position is $1,396,261,999 USD.

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)
2026-05-18 2026-03-31 13F/A-1 AMPHENOL CL A 032095101 9,458,488 -446,139 -4.50 1,195,088 -10.72 0.5706
2026-05-15 2026-03-31 13F AMPHENOL CL A 032095101 9,458,488 -446,139 1,195,088 0.2217
2026-02-17 2025-12-31 13F AMPHENOL CORP CL A 032095101 9,904,627 -215,572 -2.13 1,338,539 6.88 0.5994
2025-11-14 2025-09-30 13F AMPHENOL CORP CL A 032095101 10,120,199 -75,989 -0.75 1,252,383 24.39 0.5718
2025-08-14 2025-06-30 13F AMPHENOL CORP CL A 032095101 10,196,188 -72,146 -0.70 1,006,827 47.24 0.4935
2025-05-15 2025-03-31 13F AMPHENOL CORP CL A 032095101 10,268,334 3,012,044 41.51 683,778 35.68 0.3748
2025-02-14 2024-12-31 13F AMPHENOL CORP CL A 032095101 7,256,290 3,933,269 118.36 503,975 132.76 0.2562
2024-11-14 2024-09-30 13F AMPHENOL CORP CL A 032095101 3,323,021 -23,081 -0.69 216,526 -3.95 0.1108
2024-08-14 2024-06-30 13F AMPHENOL CORP CL A 032095101 3,346,102 2,528,932 309.47 225,428 139.16 0.1207
2024-05-15 2024-03-31 13F AMPHENOL CORP CL A 032095101 817,170 3,090 0.38 94,259 16.80 0.0514
2024-02-14 2023-12-31 13F AMPHENOL CORP CL A 032095101 814,080 19,699 2.48 80,703 20.95 0.0481
2023-11-14 2023-09-30 13F AMPHENOL CORP CL A 032095101 794,381 -1,735 -0.22 66,722 -1.34 0.0437
2023-08-14 2023-06-30 13F AMPHENOL CORP CL A 032095101 796,116 132,107 19.90 67,629 24.64 0.0421
2023-05-15 2023-03-31 13F AMPHENOL CORP CL A 032095101 664,009 8,479 1.29 54,258 8.71 0.0358
2023-02-14 2022-12-31 13F AMPHENOL CORP CL A 032095101 655,530 402,220 158.79 49,912 194.21 0.0357
2023-01-13 2022-09-30 13F/A-1 AMPHENOL CORP CL A 032095101 253,310 83,294 48.99 16,965 54.99 0.0127
2022-11-14 2022-09-30 13F AMPHENOL CORP CL A 032095101 253,310 83,294 16,965 0.0043
2022-08-15 2022-06-30 13F AMPHENOL CORP CL A 032095101 170,016 36,845 27.67 10,946 9.07 0.0075
2022-05-16 2022-03-31 13F AMPHENOL CORP CL A 032095101 133,171 -4,465 -3.24 10,036 -16.62 0.0048
2022-02-14 2021-12-31 13F AMPHENOL CORP CL A 032095101 137,636 22,779 19.83 12,036 43.10 0.0050
2021-11-16 2021-09-30 13F AMPHENOL CORP CL A 032095101 114,857 -50,938 -30.72 8,411 -25.83 0.0037
2021-08-16 2021-06-30 13F AMPHENOL CORP CL A 032095101 165,795 -7,252 -4.19 11,340 -0.73 0.0049
2021-05-17 2021-03-31 13F AMPHENOL CORP CL A 032095101 173,047 82,934 92.03 11,423 -3.06 0.0052
2021-02-16 2020-12-31 13F AMPHENOL CORP CL A 032095101 90,113 -835,298 -90.26 11,784 -88.23 0.0055
2020-11-16 2020-09-30 13F AMPHENOL CORP CL A 032095101 925,411 -634,246 -40.67 100,155 -32.93 0.0522
2020-08-14 2020-06-30 13F AMPHENOL CORP CL A 032095101 1,559,657 -807,865 -34.12 149,330 -13.40 0.0838
2020-05-14 2020-03-31 13F AMPHENOL CORP CL A 032095101 2,367,522 -1,177,573 -33.22 172,433 -55.06 0.1187
2020-02-18 2019-12-31 13F AMPHENOL CORP CL A 032095101 3,545,095 -484,518 -12.02 383,655 -1.34 0.1964
2019-11-14 2019-09-30 13F AMPHENOL CORP CL A 032095101 4,029,613 520,032 14.82 388,883 15.50 0.2107
2019-07-31 2019-06-30 13F AMPHENOL CORP CL A 032095101 3,509,581 -113,430 -3.13 336,683 -1.60 0.1833
2019-04-30 2019-03-31 13F AMPHENOL CORP CL A 032095101 3,623,011 -986,096 -21.39 342,151 -8.37 0.1896
2019-02-06 2018-12-31 13F AMPHENOL CORP CL A 032095101 4,609,107 -1,018,647 -18.10 373,400 -29.43 0.2381
2018-11-09 2018-09-30 13F AMPHENOL CORP CL A 032095101 5,627,754 -371,218 -6.19 529,123 1.21 0.2827
2018-08-10 2018-06-30 13F AMPHENOL CORP CL A 032095101 5,998,972 -1,616,458 -21.23 522,811 -20.29 0.2980
2018-05-14 2018-03-31 13F AMPHENOL CORP CL A 032095101 7,615,430 -1,861,920 -19.65 655,919 -21.17 0.3865
2018-03-12 2017-12-31 13F/A-1 AMPHENOL CORP CL A 032095101 9,477,350 85,335 0.91 832,113 4.68 0.5124
2018-02-09 2017-12-31 13F AMPHENOL CORP CL A 032095101 9,477,350 85,335 832,113
2017-11-14 2017-09-30 13F AMPHENOL CORP CL A 032095101 9,392,015 -1,205,511 -11.38 794,941 1.61 0.5095
2017-08-17 2017-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 10,597,526 9,996,239 1,662.47 782,311 1,728.13 0.5332
2017-08-14 2017-06-30 13F AMPHENOL CORP CL A 032095101 10,597,526 9,996,239 782,311
2017-05-03 2017-03-31 13F AMPHENOL CORP CL A 032095101 601,287 -67,594 -10.11 42,793 -4.80 0.3004
2017-01-30 2016-12-31 13F AMPHENOL CORP CL A 032095101 668,881 -74,885 -10.07 44,949 -6.91 0.3315
2016-10-24 2016-09-30 13F AMPHENOL CORP CL A 032095101 743,766 -23,798 -3.10 48,285 9.73 0.3558
2016-07-29 2016-06-30 13F AMPHENOL CORP CL A 032095101 767,564 -307,307 -28.59 44,004 -29.20 0.3659
2016-05-12 2016-03-31 13F AMPHENOL CORP CL A 032095101 1,074,871 130,811 13.86 62,149 26.04 0.5041
2016-02-03 2015-12-31 13F AMPHENOL CORP CL A 032095101 944,060 -27,522 -2.83 49,309 -0.41 0.3957
2015-11-16 2015-09-30 13F AMPHENOL CORP CL A 032095101 971,582 -47,245 -4.64 49,512 -16.17 0.4361
2015-08-17 2015-06-30 13F AMPHENOL CORP CL A 032095101 1,018,827 1,282 0.13 59,061 -1.50 0.4641
2015-06-02 2015-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 1,017,545 -85,416 -7.74 59,963 1.03 0.4626
2015-05-15 2015-03-31 13F AMPHENOL CORP CL A 032095101 1,017,545 27,494
2015-02-12 2014-12-31 13F AMPHENOL CORP CL A 032095101 1,102,961 1,064,300 2,752.90 59,350 1,437.17 0.4279
2014-11-12 2014-09-30 13F AMPHENOL CORP CL A 032095101 38,661 0 0.00 3,861 3.68 0.0363
2014-08-13 2014-06-30 13F AMPHENOL CORP CL A 032095101 38,661 0 0.00 3,724 5.11 0.0348
2014-05-08 2014-03-31 13F AMPHENOL CORP CL A 032095101 38,661 -10,721 -21.71 3,543 -19.55 0.0345
2014-01-14 2013-12-31 13F AMPHENOL CORP CL A 032095101 49,382 0 0.00 4,404 15.26 0.0445
2013-11-12 2013-09-30 13F AMPHENOL CORP CL A 032095101 49,382 0 0.00 3,821 -1.42 0.0422
2013-08-15 2013-06-30 13F AMPHENOL CORP CL A 032095101 49,382 49,382 3,876 0.0453
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.