암페놀 주식회사
MX ˙ BMV ˙ US0320951017
SecurityMX:APH / Amphenol Corporation
InstitutionRathbone Brothers plc
Latest Disclosed Ownership3,083,245 shares
Latest Disclosed Value $ 389,568,005
Rathbone Brothers plc reports 8.60% increase in ownership of APH / Amphenol Corporation

On May 12, 2026 - Rathbone Brothers plc filed a 13F-HR form disclosing ownership of 3,083,245 shares of Amphenol Corporation (MX:APH) valued at $389,568,005 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on February 6, 2026 disclosing 2,839,137 shares of Amphenol Corporation. This represents a change in shares of 8.60% 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)
2026-05-12 2026-03-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 3,083,245 244,108 8.60 389,568 1.53 1.6645
2026-02-06 2025-12-31 13F/A-1 AMPHENOL CORP USD0.001 Cls A COM 032095101 2,839,137 -129,024 -4.35 383,681 4.46 1.5188
2026-01-21 2025-12-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 2,839,137 -129,024 383,681 1.5188
2025-11-13 2025-09-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 2,968,161 -314,695 -9.59 367,310 13.30 1.4914
2025-08-07 2025-06-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 3,282,856 -136,781 -4.00 324,182 44.54 1.3982
2025-05-13 2025-03-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 3,419,637 200,393 6.22 224,294 0.32 1.0839
2025-02-13 2024-12-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 3,219,244 -142,688 -4.24 223,576 2.06 1.0824
2024-11-13 2024-09-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 3,361,932 34,143 1.03 219,063 -2.29 1.1054
2024-08-09 2024-06-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 3,327,789 1,624,099 95.33 224,193 14.08 1.2211
2024-05-14 2024-03-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 1,703,690 -8,245 -0.48 196,521 15.80 1.1341
2024-02-13 2023-12-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 1,711,935 -135,877 -7.35 169,704 9.35 1.0937
2023-11-13 2023-09-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 1,847,812 4,263 0.23 155,198 -0.90 1.1255
2023-08-04 2023-06-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 1,843,549 30,286 1.67 156,609 5.69 1.4615
2023-05-12 2023-03-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 1,813,263 -2,393 -0.13 148,180 7.19 1.5150
2023-02-14 2022-12-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 1,815,656 6,114 0.34 138,244 14.09 1.5566
2022-11-14 2022-09-30 13F/A-1 AMPHENOL CORP USD0.001 Cls A COM 032095101 1,809,542 2,509 0.14 121,167 4.15 1.4949
2022-11-03 2022-09-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 1,809,542 2,509 121,167 1.4949
2022-08-12 2022-06-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 1,807,033 36,976 2.09 116,337 -12.77 1.3336
2022-05-11 2022-03-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 1,770,057 52,211 3.04 133,374 -11.23 1.3608
2022-02-10 2021-12-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 1,717,846 -2,515 -0.15 150,243 19.26 1.4601
2021-11-04 2021-09-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 1,720,361 -11,250 -0.65 125,982 6.35 1.3554
2021-07-30 2021-06-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 1,731,611 154,261 9.78 118,460 13.84 1.3160
2021-05-14 2021-03-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 1,577,350 830,268 111.13 104,058 6.51 1.3325
2021-02-11 2020-12-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 747,082 -6,155 -0.82 97,696 19.79 1.3871
2020-11-13 2020-09-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 753,237 55,564 7.96 81,553 22.00 1.3954
2020-08-07 2020-06-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 697,673 104,660 17.65 66,844 54.66 1.3570
2020-05-04 2020-03-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 593,013 53,944 10.01 43,219 -25.92 1.2587
2020-02-11 2019-12-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 539,069 -23,681 -4.21 58,343 7.44 1.5359
2019-11-13 2019-09-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 562,750 127,004 29.15 54,305 29.90 1.5424
2019-08-12 2019-06-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 435,746 16,770 4.00 41,805 5.65 1.3089
2019-05-09 2019-03-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 418,976 -5,874 -1.38 39,568 14.95 1.3011
2019-02-12 2018-12-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 424,850 43,670 11.46 34,421 -3.96 1.3192
2018-10-12 2018-09-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 381,180 11,680 3.16 35,839 11.29 1.2175
2018-07-16 2018-06-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 369,500 37,500 11.30 32,202 12.61 1.2201
2018-04-06 2018-03-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 332,000 52,500 18.78 28,595 16.52 1.1636
2018-01-24 2017-12-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 279,500 0 0.00 24,540 3.73 0.9988
2017-10-24 2017-09-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 279,500 0 0.00 23,657 14.66 1.0300
2017-08-10 2017-06-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 279,500 0 0.00 20,633 3.73 0.9193
2017-04-06 2017-03-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 279,500 -1,500 -0.53 19,892 5.34 0.9068
2017-02-02 2016-12-31 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 281,000 -2,000 -0.71 18,883 2.78 0.9464
2016-10-24 2016-09-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 283,000 0 0.00 18,372 13.24 0.9490
2016-08-03 2016-06-30 13F AMPHENOL CORP USD0.001 Cls A COM 032095101 283,000 283,000 16,224 0.8940
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.