Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionNorthern Trust Corp
Latest Disclosed Ownership13,469,540 shares
Latest Disclosed Value $ 1,701,876,380
Northern Trust Corp reports 0.30% decrease in ownership of APH / Amphenol Corporation

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 13,469,540 shares of Amphenol Corporation (US:APH) valued at $1,701,876,379 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 13,510,266 shares of Amphenol Corporation. This represents a change in shares of -0.30% during the quarter. The current value of the position is $1,988,373,495 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)
2026-05-14 2026-03-31 13F AMPHENOL CL A 032095101 13,469,540 -40,726 -0.30 1,701,876 -6.79 0.0461
2026-02-17 2025-12-31 13F AMPHENOL CORP CL A 032095101 13,510,266 592,868 4.59 1,825,777 14.22 0.2328
2025-11-14 2025-09-30 13F AMPHENOL CORP CL A 032095101 12,917,398 -16,368 -0.13 1,598,528 25.16 0.2045
2025-08-13 2025-06-30 13F AMPHENOL CORP CL A 032095101 12,933,766 137,734 1.08 1,277,209 52.18 0.1756
2025-05-13 2025-03-31 13F AMPHENOL CORP CL A 032095101 12,796,032 -269,770 -2.06 839,292 -7.51 0.1246
2025-02-14 2024-12-31 13F AMPHENOL CORP CL A 032095101 13,065,802 1,689,632 14.85 907,420 22.41 0.1285
2024-11-13 2024-09-30 13F AMPHENOL CORP COM 032095101 11,376,170 -449,156 -3.80 741,271 -6.95 0.1213
2024-08-14 2024-06-30 13F AMPHENOL CORP COM 032095101 11,825,326 6,044,332 104.56 796,672 19.47 0.1342
2024-05-14 2024-03-31 13F AMPHENOL CORP COM 032095101 5,780,994 -184,691 -3.10 666,838 12.76 0.1152
2024-02-13 2023-12-31 13F AMPHENOL CORP COM 032095101 5,965,685 -230,054 -3.71 591,378 13.64 0.1070
2023-11-13 2023-09-30 13F AMPHENOL CORP COM 032095101 6,195,739 351,353 6.01 520,380 4.81 0.1008
2023-08-11 2023-06-30 13F AMPHENOL CORP COM 032095101 5,844,386 -335,949 -5.44 496,481 -1.70 0.0954
2023-05-15 2023-03-31 13F AMPHENOL CORP COM 032095101 6,180,335 -19,568 -0.32 505,057 6.99 0.1001
2023-02-13 2022-12-31 13F AMPHENOL CORP COM 032095101 6,199,903 7,650 0.12 472,061 13.85 0.0991
2022-11-14 2022-09-30 13F AMPHENOL CORP COM 032095101 6,192,253 -46,977 -0.75 414,634 3.22 0.0947
2022-08-12 2022-06-30 13F AMPHENOL CORP COM 032095101 6,239,230 -162,397 -2.54 401,682 -16.73 0.0860
2022-05-13 2022-03-31 13F AMPHENOL CORP COM 032095101 6,401,627 -184,510 -2.80 482,363 -16.26 0.0849
2022-02-08 2021-12-31 13F AMPHENOL CORP CL A 032095101 6,586,137 -78,724 -1.18 576,023 18.02 0.0944
2021-11-15 2021-09-30 13F AMPHENOL CORP CL A 032095101 6,664,861 210,853 3.27 488,068 10.54 0.0864
2021-08-13 2021-06-30 13F AMPHENOL CORP CL A 032095101 6,454,008 -66,576 -1.02 441,520 2.64 0.0778
2021-05-12 2021-03-31 13F AMPHENOL CORP CL A 032095101 6,520,584 3,214,404 97.22 430,163 -0.51 0.0800
2021-02-11 2020-12-31 13F AMPHENOL CORP CL A 032095101 3,306,180 -77,385 -2.29 432,350 18.02 0.0842
2020-11-16 2020-09-30 13F AMPHENOL CORP CL A 032095101 3,383,565 1,127 0.03 366,339 13.04 0.0803
2020-08-14 2020-06-30 13F AMPHENOL CORP COM 032095101 3,382,438 -1,546 -0.05 324,071 31.40 0.0768
2020-05-14 2020-03-31 13F AMPHENOL CORP CL A 032095101 3,383,984 29,666 0.88 246,625 -32.07 0.0708
2020-02-14 2019-12-31 13F AMPHENOL CORP CL A 032095101 3,354,318 18,927 0.57 363,038 12.79 0.0813
2019-11-13 2019-09-30 13F AMPHENOL CORP COM 032095101 3,335,391 -53,789 -1.59 321,865 -1.01 0.0770
2019-08-13 2019-06-30 13F AMPHENOL CORP CL A 032095101 3,389,180 60,149 1.81 325,157 3.42 0.0771
2019-05-13 2019-03-31 13F AMPHENOL CORP CL A 032095101 3,329,031 -20,407 -0.61 314,393 15.85 0.0777
2019-02-12 2018-12-31 13F AMPHENOL CORP CL A 032095101 3,349,438 -95,187 -2.76 271,372 -16.21 0.0761
2018-11-14 2018-09-30 13F AMPHENOL CORP CL A 032095101 3,444,625 -157,066 -4.36 323,863 3.18 0.0793
2018-09-18 2018-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 3,601,691 -81,038 -2.20 313,887 -1.04 0.0797
2018-08-14 2018-06-30 13F AMPHENOL CORP CL A 032095101 3,623,238 -59,491 315,764
2018-05-09 2018-03-31 13F AMPHENOL CORP CL A 032095101 3,682,729 -35,746 -0.96 317,194 -2.84 0.0825
2018-02-14 2017-12-31 13F AMPHENOL CORP CL A 032095101 3,718,475 -56,714 -1.50 326,482 2.17 0.0827
2017-11-13 2017-09-30 13F AMPHENOL CORP CL A 032095101 3,775,189 159,597 4.41 319,533 19.72 0.0833
2017-08-11 2017-06-30 13F AMPHENOL CORP COM 032095101 3,615,592 -12,066 -0.33 266,903 3.38 0.0746
2017-05-12 2017-03-31 13F AMPHENOL CORP COM 032095101 3,627,658 321,461 9.72 258,180 16.20 0.0744
2017-02-13 2016-12-31 13F AMPHENOL CORP COM 032095101 3,306,197 -178,556 -5.12 222,177 -1.79 0.0681
2016-11-09 2016-09-30 13F AMPHENOL CORP COM 032095101 3,484,753 16,907 0.49 226,231 13.79 0.0705
2016-08-12 2016-06-30 13F AMPHENOL CORP CL A 032095101 3,467,846 -85,120 -2.40 198,811 -2.17 0.0645
2016-08-19 2016-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 3,552,966 -18,218 -0.51 203,231 8.96 0.0674
2016-05-13 2016-03-31 13F Amphenol Corp COMM 032095101 3,552,949 205,431
2016-02-12 2015-12-31 13F Amphenol Corp COMM 032095101 3,571,184 -253,982 -6.64 186,523 -4.31 0.0618
2015-11-12 2015-09-30 13F Amphenol Corp COMM 032095101 3,825,166 220,623 6.12 194,931 -6.71 0.0651
2015-08-13 2015-06-30 13F AMPHENOL CORP COM 032095101 3,604,543 -418,226 -10.40 208,955 -11.86 0.1416
2015-08-13 2015-06-30 13F Amphenol Corp COMM 003209510 386,687 -3,636,082 22,416 0.0152
2015-05-14 2015-03-31 13F Amphenol Corp COMM 032095101 4,022,769 -107,174 -2.60 237,062 6.67 0.0713
2015-02-12 2014-12-31 13F Amphenol Corp COM 032095101 4,129,943 1,529,520 58.82 222,233 -14.42 0.0671
2014-11-13 2014-09-30 13F Amphenol Corp COMM 032095101 2,600,423 624,475 31.60 259,678 36.41 0.0816
2014-08-14 2014-06-30 13F AMPHENOL CORP com 032095101 1,975,948 -233,701 -10.58 190,362 -6.00 0.0593
2014-05-14 2014-03-31 13F AMPHENOL CORP COMM 032095101 2,209,649 124,837 5.99 202,514 8.92 0.0637
2014-02-21 2013-12-31 13F/A-1 AMPHENOL CORP COM 032095101 2,084,812 -19,871 -0.94 185,923 14.16 0.0596
2014-02-12 2013-12-31 13F AMPHENOL CORP COM 032095101 2,084,812 185,923
2013-11-13 2013-09-30 13F AMPHENOL CORP COM 032095101 2,104,683 -45,029 -2.09 162,860 -2.80 0.0574
2013-08-09 2013-06-30 13F AMPHENOL CORP COM 032095101 2,149,712 2,149,712 167,549 0.0607
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.