Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionOppenheimer Asset Management Inc.
Latest Disclosed Ownership233,453 shares
Latest Disclosed Value $ 29,496,787
Oppenheimer Asset Management Inc. ownership in APH / Amphenol Corporation

On April 23, 2026 - Oppenheimer Asset Management Inc. filed a 13F-HR form disclosing ownership of 233,453 shares of Amphenol Corporation (US:APH) valued at $29,496,787 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 0 shares of Amphenol Corporation. The current value of the position is $32,405,611 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)
2026-04-23 2026-03-31 13F AMPHENOL CL A 032095101 233,453 233,453 29,497 0.0843
2026-02-02 2025-12-31 13F AMPHENOL CORP CL A 032095101 0 -271,766 -100.00 0 -100.00
2025-11-06 2025-09-30 13F AMPHENOL CORP CL A 032095101 271,766 26,175 10.66 33,631 38.67 0.3699
2025-07-31 2025-06-30 13F AMPHENOL CORP CL A 032095101 245,591 1,869 0.77 24,252 51.72 0.2781
2025-04-23 2025-03-31 13F AMPHENOL CORP CL A 032095101 243,722 58,392 31.51 15,986 24.19 0.1984
2025-02-05 2024-12-31 13F AMPHENOL CORP CL A 032095101 185,330 -7,248 -3.76 12,871 2.57 0.1564
2024-11-05 2024-09-30 13F AMPHENOL CORP CL A 032095101 192,578 104 0.05 12,548 -3.22 0.1511
2024-08-08 2024-06-30 13F AMPHENOL CORP CL A 032095101 192,474 133,532 226.55 12,967 90.73 0.1656
2024-05-07 2024-03-31 13F AMPHENOL CORP CL A 032095101 58,942 -45,494 -43.56 6,799 -34.33 0.0996
2024-02-13 2023-12-31 13F AMPHENOL CORP CL A 032095101 104,436 202 0.19 10,353 18.25 0.1440
2023-11-08 2023-09-30 13F AMPHENOL CORP CL A 032095101 104,234 17,596 20.31 8,755 18.96 0.1343
2023-08-03 2023-06-30 13F AMPHENOL CORP CL A 032095101 86,638 12,875 17.45 7,360 22.10 0.1083
2023-05-10 2023-03-31 13F AMPHENOL CORP CL A 032095101 73,763 7,447 11.23 6,028 19.37 0.0928
2023-02-07 2022-12-31 13F AMPHENOL CORP CL A 032095101 66,316 -5,741 -7.97 5,049 4.66 0.0813
2022-11-14 2022-09-30 13F AMPHENOL CORP CL A 032095101 72,057 11,632 19.25 4,824 23.98 0.0851
2022-08-08 2022-06-30 13F AMPHENOL CORP CL A 032095101 60,425 -696 -1.14 3,891 -15.52 0.0652
2022-05-12 2022-03-31 13F AMPHENOL CORP CL A 032095101 61,121 -13,061 -17.61 4,606 -29.01 0.0654
2022-02-02 2021-12-31 13F AMPHENOL CORP CL A 032095101 74,182 -7,077 -8.71 6,488 9.02 0.0860
2021-11-12 2021-09-30 13F AMPHENOL CORP CL A 032095101 81,259 346 0.43 5,951 7.52 0.0846
2021-08-03 2021-06-30 13F AMPHENOL CORP CL A 032095101 80,913 -7,245 -8.22 5,535 -4.82 0.0788
2021-05-17 2021-03-31 13F AMPHENOL CORP CL A 032095101 88,158 39,612 81.60 5,815 -8.41 0.0901
2021-02-11 2020-12-31 13F AMPHENOL CORP CL A 032095101 48,546 1,362 2.89 6,349 24.27 0.1060
2020-11-13 2020-09-30 13F AMPHENOL CORP CL A 032095101 47,184 4,114 9.55 5,109 23.79 0.0992
2020-08-11 2020-06-30 13F AMPHENOL CORP CL A 032095101 43,070 1,013 2.41 4,127 34.65 0.0852
2020-05-08 2020-03-31 13F AMPHENOL CORP CL A 032095101 42,057 2,505 6.33 3,065 -28.40 0.0753
2020-02-07 2019-12-31 13F AMPHENOL CORP CL A 032095101 39,552 125 0.32 4,281 12.51 0.0904
2019-10-31 2019-09-30 13F AMPHENOL CORP CL A 032095101 39,427 7,456 23.32 3,805 24.06 0.0845
2019-08-09 2019-06-30 13F AMPHENOL CORP CL A 032095101 31,971 -2,107 -6.18 3,067 -4.72 0.0678
2019-04-24 2019-03-31 13F AMPHENOL CORP CL A 032095101 34,078 -6,118 -15.22 3,219 -1.17 0.0723
2019-01-30 2018-12-31 13F AMPHENOL CORP CL A 032095101 40,196 22,459 126.62 3,257 95.38 0.0807
2018-10-26 2018-09-30 13F AMPHENOL CORP CL A 032095101 17,737 -715 -3.87 1,667 3.60 0.0369
2018-08-10 2018-06-30 13F AMPHENOL CORP CL A 032095101 18,452 -920 -4.75 1,609 -3.59 0.0394
2018-05-09 2018-03-31 13F AMPHENOL CORP CL A 032095101 19,372 -3,372 -14.83 1,669 -13.30 0.0419
2018-02-07 2017-12-31 13F AMPHENOL CORP CL A 032095101 22,744 0 0.00 1,925 0.00 0.0511
2017-11-14 2017-09-30 13F AMPHENOL CORP CL A 032095101 22,744 -2,423 -9.63 1,925 3.61 0.0500
2017-08-09 2017-06-30 13F AMPHENOL CORP CL A 032095101 25,167 -1,721 -6.40 1,858 -2.93 0.0513
2017-05-15 2017-03-31 13F AMPHENOL CORP CL A 032095101 26,888 26,888 1,914 0.0545
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.