Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionRsm Us Wealth Management Llc
Latest Disclosed Ownership35,536 shares
Latest Disclosed Value $ 4,498,680
Rsm Us Wealth Management Llc reports 12.58% decrease in ownership of APH / Amphenol Corporation

On May 12, 2026 - Rsm Us Wealth Management Llc filed a 13F-HR form disclosing ownership of 35,536 shares of Amphenol Corporation (US:APH) valued at $4,489,974 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 40,649 shares of Amphenol Corporation. This represents a change in shares of -12.58% during the quarter. The current value of the position is $4,932,752 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)
2026-05-12 2026-03-31 13F AMPHENOL CL A 032095101 35,536 -5,113 -12.58 4,499 -18.75 0.0552
2026-01-23 2025-12-31 13F AMPHENOL CORP CL A 032095101 40,649 6,264 18.22 5,536 29.95 0.0705
2025-11-12 2025-09-30 13F AMPHENOL CORP CL A 032095101 34,385 5,633 19.59 4,260 49.84 0.0555
2025-08-13 2025-06-30 13F AMPHENOL CORP CL A 032095101 28,752 -6,596 -18.66 2,844 22.33 0.0397
2025-05-06 2025-03-31 13F AMPHENOL CORP CL A 032095101 35,348 -9,085 -20.45 2,324 -24.89 0.0361
2025-01-27 2024-12-31 13F AMPHENOL CORP CL A 032095101 44,433 -464 -1.03 3,094 8.11 0.0445
2024-11-07 2024-09-30 13F AMPHENOL CORP CL A 032095101 44,897 4,425 10.93 2,863 4.80 0.0420
2024-08-07 2024-06-30 13F AMPHENOL CORP CL A 032095101 40,472 34,309 556.69 2,732 284.65 0.0458
2024-05-02 2024-03-31 13F AMPHENOL CORP CL A 032095101 6,163 -205 -3.22 711 12.34 0.0183
2024-02-05 2023-12-31 13F AMPHENOL CORP CL A 032095101 6,368 6,368 633 0.0171
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.