Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionRobeco Institutional Asset Management B.V.
Latest Disclosed Ownership452,812 shares
Latest Disclosed Value $ 57,212,796
Robeco Institutional Asset Management B.V. reports 6.93% decrease in ownership of APH / Amphenol Corporation

On April 21, 2026 - Robeco Institutional Asset Management B.V. filed a 13F-HR form disclosing ownership of 452,812 shares of Amphenol Corporation (US:APH) valued at $57,212,796 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 486,529 shares of Amphenol Corporation. This represents a change in shares of -6.93% during the quarter. The current value of the position is $62,854,834 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)
2026-04-21 2026-03-31 13F AMPHENOL CL A 032095101 452,812 -33,717 -6.93 57,213 -12.98 0.0815
2026-01-23 2025-12-31 13F AMPHENOL CORP CL A 032095101 486,529 -91,433 -15.82 65,750 -8.07 0.0936
2025-10-22 2025-09-30 13F AMPHENOL CORP CL A 032095101 577,962 -16,035 -2.70 71,523 21.93 0.1036
2025-07-18 2025-06-30 13F AMPHENOL CORP CL A 032095101 593,997 -261,865 -30.60 58,657 4.49 0.0948
2025-04-23 2025-03-31 13F AMPHENOL CORP CL A 032095101 855,862 -15,368 -1.76 56,136 -7.22 0.1090
2025-01-23 2024-12-31 13F AMPHENOL CORP CL A 032095101 871,230 -27,776 -3.09 60,507 3.29 0.1147
2024-10-29 2024-09-30 13F AMPHENOL CORP CL A 032095101 899,006 -236,119 -20.80 58,579 -23.40 0.1164
2024-07-23 2024-06-30 13F AMPHENOL CORP CL A 032095101 1,135,125 992,447 695.59 76,473 364.68 0.1645
2024-04-24 2024-03-31 13F AMPHENOL CORP CL A 032095101 142,678 129,220 960.17 16,458 1,133.66 0.0358
2024-02-14 2023-12-31 13F/A-1 AMPHENOL CORP CL A 032095101 13,458 -2,089 -13.44 1,334 2.22 0.0032
2024-02-08 2023-12-31 13F AMPHENOL CORP CL A 032095101 2,571 -12,976 13 0.0025
2023-10-24 2023-09-30 13F AMPHENOL CORP CL A 032095101 15,547 -28,242 -64.50 1,306 -64.91 0.0035
2023-07-24 2023-06-30 13F AMPHENOL CORP CL A 032095101 43,789 -166,726 -79.20 3,720 -78.38 0.0098
2023-05-04 2023-03-31 13F AMPHENOL CORP CL A 032095101 210,515 334 0.16 17,203 7.50 0.0469
2023-02-07 2022-12-31 13F AMPHENOL CORP CL A 032095101 210,181 -33,250 -13.66 16,003 -1.83 0.0461
2022-12-01 2022-09-30 13F/A-1 AMPHENOL CORP CL A 032095101 243,431 72,253 42.21 16,301 47.94 0.0527
2022-10-27 2022-09-30 13F AMPHENOL CORP CL A 032095101 243,431 72,253 16,301 0.0520
2022-12-01 2022-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 171,178 42,762 33.30 11,019 13.87 0.0342
2022-07-27 2022-06-30 13F AMPHENOL CORP CL A 032095101 171,178 42,762 11,019 0.0338
2022-12-01 2022-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 128,416 20,729 19.25 9,677 2.75 0.0228
2022-04-26 2022-03-31 13F AMPHENOL CORP CL A 032095101 128,416 20,729 9,677 0.0225
2022-12-01 2021-12-31 13F/A-1 AMPHENOL CORP CL A 032095101 107,687 -24,078 -18.27 9,418 -2.38 0.0200
2022-01-31 2021-12-31 13F AMPHENOL CORP CL A 032095101 107,687 -24,078 9,418 0.0198
2022-12-01 2021-09-30 13F/A-1 AMPHENOL CORP CL A 032095101 131,765 -32,093 -19.59 9,648 -13.93 0.0214
2021-10-20 2021-09-30 13F AMPHENOL CORP CL A 032095101 131,765 -32,093 9,648 0.0211
2022-12-01 2021-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 163,858 8,019 5.15 11,209 9.03 0.0248
2021-07-28 2021-06-30 13F AMPHENOL CORP CL A 032095101 163,858 8,019 11,209 0.0245
2022-12-01 2021-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 155,839 65,369 72.25 10,281 -13.09 0.0253
2021-04-23 2021-03-31 13F AMPHENOL CORP CL A 032095101 155,839 65,369 10,281 0.0250
2022-12-01 2020-12-31 13F/A-1 AMPHENOL CORP CL A 032095101 90,470 16,491 22.29 11,830 47.69 0.0311
2021-01-28 2020-12-31 13F AMPHENOL CORP CL A 032095101 90,470 16,491 11,830 0.0307
2021-01-19 2020-09-30 13F/A-1 AMPHENOL CORP CL A 032095101 73,979 63,725 621.46 8,010 714.85 0.0248
2020-10-29 2020-09-30 13F AMPHENOL CORP CL A 032095101 73,979 63,725 8,010 24,737.4869
2021-01-19 2020-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 10,254 -5,434 -34.64 983 -14.00 0.0033
2020-07-20 2020-06-30 13F AMPHENOL CORP CL A 032095101 10,254 -5,434 983 3,335.4943
2021-01-19 2020-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 15,688 9,200 141.80 1,143 62.82 0.0046
2020-04-30 2020-03-31 13F AMPHENOL CORP CL A 032095101 15,688 9,200 1,143 4,581.4018
2021-01-19 2019-12-31 13F/A-1 AMPHENOL CORP CL A 032095101 6,488 -3,831 -37.13 702 -29.52 0.0022
2020-02-06 2019-12-31 13F AMPHENOL CORP CL A 032095101 6,488 -3,831 702 2,245.2930
2021-01-19 2019-09-30 13F/A-1 AMPHENOL CORP CL A 032095101 10,319 -15,373 -59.84 996 -59.58 0.0035
2019-10-17 2019-09-30 13F AMPHENOL CORP CL A 032095101 10,319 -15,373 996 3,511.3096
2021-01-19 2019-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 25,692 -942,002 -97.35 2,464 -97.30 0.0087
2019-07-19 2019-06-30 13F AMPHENOL CORP CL A 032095101 25,692 -942,002 2,464 8,688.7085
2021-01-19 2019-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 967,694 -150,167 -13.43 91,391 0.93 0.3361
2019-05-02 2019-03-31 13F AMPHENOL CORP CL A 032095101 967,694 -150,167 91,391 335,555.2411
2021-01-19 2018-12-31 13F/A-1 AMPHENOL CORP CL A 032095101 1,117,861 -1,698 -0.15 90,548 -13.99 0.4066
2019-02-08 2018-12-31 13F AMPHENOL CORP CL A 032095101 1,117,861 -1,698 90,548 405,876.9228
2021-01-19 2018-09-30 13F/A-1 AMPHENOL CORP CL A 032095101 1,119,559 16,385 1.49 105,275 9.48 0.4169
2018-10-25 2018-09-30 13F AMPHENOL CORP CL A 032095101 1,119,559 16,385 105,275
2021-01-19 2018-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 1,103,174 -2,631 -0.24 96,156 0.94 0.4380
2018-08-03 2018-06-30 13F AMPHENOL CORP CL A 032095101 1,103,174 -2,631 96,156
2021-01-19 2018-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 1,105,805 47,719 4.51 95,258 2.53 0.4470
2018-05-07 2018-03-31 13F AMPHENOL CORP CL A 032095101 1,105,805 47,719 95,258 445,477.1059
2021-01-19 2017-12-31 13F/A-1 AMPHENOL CORP CL A 032095101 1,058,086 500,762 89.85 92,909 96.95 0.4815
2018-01-25 2017-12-31 13F AMPHENOL CORP CL A 032095101 1,058,086 500,762 92,909
2021-01-19 2017-09-30 13F/A-1 AMPHENOL CORP CL A 032095101 557,324 20,226 3.77 47,175 18.99 0.2929
2017-10-17 2017-09-30 13F AMPHENOL CORP CL A 032095101 557,324 20,226 47,175 292,265.6745
2021-01-19 2017-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 537,098 41,611 8.40 39,647 12.42 0.2554
2017-08-07 2017-06-30 13F AMPHENOL CORP CL A 032095101 537,098 41,611 39,647 258,133.9003
2021-01-19 2017-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 495,487 6,750 1.38 35,266 7.37 0.2348
2017-05-15 2017-03-31 13F AMPHENOL CORP CL A 032095101 495,487 6,750 35,266 234,234.6423
2017-02-09 2016-12-31 13F AMPHENOL CORP CL A 032095101 488,737 476,817 4,000.14 32,846 4,143.67 0.2570
2016-11-07 2016-09-30 13F AMPHENOL CORP CL A 032095101 11,920 0 0.00 774 13.32 0.0057
2016-07-22 2016-06-30 13F AMPHENOL CORP CL A 032095101 11,920 0 0.00 683 -0.87 0.0052
2016-05-16 2016-03-31 13F AMPHENOL CORP CL A 032095101 11,920 0 0.00 689 10.59 0.0055
2016-02-08 2015-12-31 13F AMPHENOL CORP CL A 032095101 11,920 2,987 33.44 623 36.92 0.0053
2015-11-12 2015-09-30 13F AMPHENOL CORP CL A 032095101 8,933 0 0.00 455 -12.16 0.0035
2015-08-17 2015-06-30 13F AMPHENOL CORP CL A 032095101 8,933 0 0.00 518 -1.52 0.0039
2015-04-24 2015-03-31 13F AMPHENOL CORP CL A 032095101 8,933 0 0.00 526 9.36 0.0040
2015-02-12 2014-12-31 13F AMPHENOL CORP CL A 032095101 8,933 6,905 340.48 481 136.95 0.0034
2014-11-10 2014-09-30 13F AMPHENOL CORP CL A 032095101 2,028 0 0.00 203 4.10 0.0015
2014-08-13 2014-06-30 13F AMPHENOL CORP CL A 032095101 2,028 1,056 108.64 195 119.10 0.0014
2014-05-07 2014-03-31 13F AMPHENOL CORP CL A 032095101 972 0 0.00 89 2.30 0.0007
2014-02-04 2013-12-31 13F AMPHENOL CORP CL A 032095101 972 0 0.00 87 16.00 0.0007
2013-11-12 2013-09-30 13F AMPHENOL CORP CL A 032095101 972 0 0.00 75 -1.32 0.0007
2013-08-27 2013-06-30 13F Amphenol COM 032095101 972 972 76 0.0008
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.