Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionRMB Capital Management, LLC
Latest Disclosed Ownership57,658 shares
Latest Disclosed Value $ 7,297,289
RMB Capital Management, LLC reports 143.34% increase in ownership of APH / Amphenol Corporation

On May 15, 2026 - RMB Capital Management, LLC filed a 13F-HR form disclosing ownership of 57,658 shares of Amphenol Corporation (US:APH) valued at $7,285,088 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 23,694 shares of Amphenol Corporation. This represents a change in shares of 143.34% during the quarter. The current value of the position is $8,003,507 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)
2026-05-15 2026-03-31 13F AMPHENOL CL A 032095101 57,658 33,964 143.34 7,297 127.46 0.0983
2026-02-17 2025-12-31 13F AMPHENOL CORP CL A 032095101 23,694 468 2.01 3,208 11.47 0.0556
2025-11-13 2025-09-30 13F AMPHENOL CORP CL A 032095101 23,226 -1,485 -6.01 2,878 17.76 0.0528
2025-08-14 2025-06-30 13F AMPHENOL CORP CL A 032095101 24,711 24,711 2,444 0.0464
2025-05-15 2025-03-31 13F AMPHENOL CORP CL A 032095101 0 -3,931 -100.00 0 -100.00
2025-02-13 2024-12-31 13F AMPHENOL CORP CL A 032095101 3,931 -2,576 -39.59 273 -35.46 0.0063
2024-11-06 2024-09-30 13F AMPHENOL CORP CL A 032095101 6,507 6,507 424 0.0096
2024-08-13 2024-06-30 13F AMPHENOL CORP CL A 032095101 0 -1,795 -100.00 0 -100.00
2024-05-15 2024-03-31 13F AMPHENOL CORP CL A 032095101 1,795 -281 -13.54 207 0.98 0.0047
2024-02-14 2023-12-31 13F AMPHENOL CORP CL A 032095101 2,076 2,076 206 0.0063
2023-08-11 2023-06-30 13F AMPHENOL CORP CL A 032095101 0 -2,641 -100.00 0 -100.00
2023-05-11 2023-03-31 13F AMPHENOL CORP CL A 032095101 2,641 2,641 216 0.0075
2022-05-06 2022-03-31 13F AMPHENOL CORP CL A 032095101 0 -4,300 -100.00 0 -100.00
2022-01-26 2021-12-31 13F AMPHENOL CORP CL A 032095101 4,300 -10,197 -70.34 376 -64.60 0.0113
2021-10-20 2021-09-30 13F AMPHENOL CORP CL A 032095101 14,497 312 2.20 1,062 9.48 0.0349
2021-08-13 2021-06-30 13F AMPHENOL CORP CL A 032095101 14,185 27 0.19 970 3.85 0.0324
2021-05-12 2021-03-31 13F AMPHENOL CORP CL A 032095101 14,158 -16,663 -54.06 934 -76.82 0.0345
2021-02-11 2020-12-31 13F AMPHENOL CORP CL A 032095101 30,821 21,866 244.18 4,030 315.89 0.1473
2020-11-10 2020-09-30 13F AMPHENOL CORP CL A 032095101 8,955 203 2.32 969 15.63 0.0419
2020-08-05 2020-06-30 13F AMPHENOL CORP CL A 032095101 8,752 85 0.98 838 32.59 0.0369
2020-05-11 2020-03-31 13F AMPHENOL CORP CL A 032095101 8,667 -3,837 -30.69 632 -53.32 0.0300
2020-02-13 2019-12-31 13F AMPHENOL CORP CL A 032095101 12,504 -8,346 -40.03 1,354 -32.70 0.0376
2019-11-12 2019-09-30 13F AMPHENOL CORP CL A 032095101 20,850 1,387 7.13 2,012 7.77 0.0529
2019-08-13 2019-06-30 13F AMPHENOL CORP CL A 032095101 19,463 46 0.24 1,867 1.80 0.0472
2019-05-15 2019-03-31 13F AMPHENOL CORP CL A 032095101 19,417 -155 -0.79 1,834 15.64 0.0463
2019-02-13 2018-12-31 13F AMPHENOL CORP CL A 032095101 19,572 24 0.12 1,586 -13.71 0.0405
2018-11-14 2018-09-30 13F AMPHENOL CORP CL A 032095101 19,548 -997 -4.85 1,838 2.68 0.0441
2018-08-13 2018-06-30 13F AMPHENOL CORP CL A 032095101 20,545 -3,110 -13.15 1,790 -12.13 0.0426
2018-05-14 2018-03-31 13F AMPHENOL CORP CL A 032095101 23,655 834 3.65 2,037 1.70 0.0521
2018-02-14 2017-12-31 13F AMPHENOL CORP CL A 032095101 22,821 11,084 94.44 2,003 101.71 0.0520
2017-11-14 2017-09-30 13F AMPHENOL CORP CL A 032095101 11,737 -2 -0.02 993 14.67 0.0257
2017-08-14 2017-06-30 13F AMPHENOL CORP CL A 032095101 11,739 11,739 866 0.0248
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.