Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionVestmark Advisory Solutions, Inc.
Latest Disclosed Ownership86,203 shares
Latest Disclosed Value $ 10,891,906
Vestmark Advisory Solutions, Inc. reports 78.91% increase in ownership of APH / Amphenol Corporation

On May 15, 2026 - Vestmark Advisory Solutions, Inc. filed a 13F-HR form disclosing ownership of 86,203 shares of Amphenol Corporation (US:APH) valued at $10,891,749 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 48,181 shares of Amphenol Corporation. This represents a change in shares of 78.91% during the quarter. The current value of the position is $12,725,287 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.

Upgrade to unlock premium data and export to Excel .

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 86,203 38,022 78.91 10,892 67.27 0.0749
2026-02-06 2025-12-31 13F AMPHENOL CORP CL A 032095101 48,181 5,393 12.60 6,511 22.97 0.0879
2025-11-10 2025-09-30 13F AMPHENOL CORP CL A 032095101 42,788 -5,074 -10.60 5,295 12.04 0.1009
2025-08-06 2025-06-30 13F AMPHENOL CORP CL A 032095101 47,862 29,176 156.14 4,726 285.80 0.0683
2025-05-13 2025-03-31 13F AMPHENOL CORP CL A 032095101 18,686 12,189 187.61 1,226 171.62 0.0316
2025-02-06 2024-12-31 13F AMPHENOL CORP CL A 032095101 6,497 -6,489 -49.97 451 -46.69 0.0155
2024-11-14 2024-09-30 13F AMPHENOL CORP CL A 032095101 12,986 1,802 16.11 846 12.35 0.0315
2024-08-12 2024-06-30 13F AMPHENOL CORP CL A 032095101 11,184 7,614 213.28 753 83.21 0.0315
2024-05-15 2024-03-31 13F AMPHENOL CORP CL A 032095101 3,570 -604 -14.47 412 -0.48 0.0177
2024-02-06 2023-12-31 13F AMPHENOL CORP CL A 032095101 4,174 4,174 414 0.0210
2023-11-06 2023-09-30 13F AMPHENOL CORP CL A 032095101 0 -5,079 -100.00 0 -100.00
2023-08-07 2023-06-30 13F AMPHENOL CORP CL A 032095101 5,079 210 4.31 431 8.56 0.0164
2023-05-09 2023-03-31 13F AMPHENOL CORP CL A 032095101 4,869 2,098 75.71 398 89.05 0.0172
2023-01-20 2022-12-31 13F AMPHENOL CORP CL A 032095101 2,771 2,771 211 0.0103
2022-08-04 2022-06-30 13F AMPHENOL CORP CL A 032095101 0 -3,273 -100.00 0 -100.00
2022-04-27 2022-03-31 13F AMPHENOL CORP CL A 032095101 3,273 472 16.85 247 0.82 0.0140
2022-01-31 2021-12-31 13F AMPHENOL CORP CL A 032095101 2,801 -57 -1.99 245 17.22 0.0138
2021-11-15 2021-09-30 13F AMPHENOL CORP CL A 032095101 2,858 2,858 209 0.0142
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.