Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionBoston Trust Walden Corp
Latest Disclosed Ownership5,059 shares
Latest Disclosed Value $ 639,205
Boston Trust Walden Corp reports 34.58% increase in ownership of APH / Amphenol Corporation

On April 24, 2026 - Boston Trust Walden Corp filed a 13F-HR form disclosing ownership of 5,059 shares of Amphenol Corporation (US:APH) valued at $639,205 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 28, 2026 disclosing 3,759 shares of Amphenol Corporation. This represents a change in shares of 34.58% during the quarter. The current value of the position is $746,810 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)
2026-04-24 2026-03-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 5,059 1,300 34.58 639 26.04 0.0031
2026-01-28 2025-12-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 3,759 1,905 102.75 508 121.40 0.0038
2025-10-17 2025-09-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 1,854 1,854 229 0.0017
2024-01-24 2023-12-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 0 -81,393 -100.00 0 -100.00
2023-10-18 2023-09-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 81,393 515 0.64 6,836 -0.49 0.0573
2023-07-24 2023-06-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 80,878 14,770 22.34 6,871 27.18 0.0563
2023-04-19 2023-03-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 66,108 1,135 1.75 5,402 9.20 0.0466
2023-01-20 2022-12-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 64,973 -17,000 -20.74 4,947 -9.87 0.0435
2022-10-19 2022-09-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 81,973 545 0.67 5,489 4.71 0.0544
2022-07-22 2022-06-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 81,428 -434 -0.53 5,242 -15.01 0.0495
2022-04-20 2022-03-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 81,862 2,322 2.92 6,168 -11.33 0.0509
2022-01-21 2021-12-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 79,540 -3,625 -4.36 6,956 14.20 0.0559
2021-10-25 2021-09-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 83,165 3,900 4.92 6,091 12.34 0.0539
2021-07-22 2021-06-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 79,265 -770 -0.96 5,422 2.69 0.0482
2021-04-21 2021-03-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 80,035 49,615 163.10 5,280 32.73 0.0511
2021-01-15 2020-12-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 30,420 -1,040 -3.31 3,978 16.79 0.0424
2020-10-14 2020-09-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 31,460 91 0.29 3,406 13.34 0.0424
2020-07-23 2020-06-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 31,369 -825 -2.56 3,005 28.09 0.0406
2020-04-24 2020-03-31 13F/A-1 AMPHENOL CORP-CL A COMMON STOCK 032095101 32,194 50 0.16 2,346 -32.57 0.0374
2020-04-21 2020-03-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 32,194 50 2,346 20,802.6931
2020-01-10 2019-12-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 32,144 584 1.85 3,479 14.25 0.0405
2019-10-21 2019-09-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 31,560 4,535 16.78 3,045 17.43 0.0383
2019-07-25 2019-06-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 27,025 1,375 5.36 2,593 7.06 0.0337
2019-04-16 2019-03-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 25,650 -2,650 -9.36 2,422 5.63 0.0330
2019-01-17 2018-12-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 28,300 8,282 41.37 2,293 21.84 0.0365
2018-10-23 2018-09-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 20,018 0 0.00 1,882 7.91 0.0259
2018-07-25 2018-06-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 20,018 0 0.00 1,744 1.10 0.0256
2018-04-13 2018-03-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 20,018 0 0.00 1,725 -1.82 0.0262
2018-01-29 2017-12-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 20,018 -125 -0.62 1,757 3.05 0.0258
2017-10-13 2017-09-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 20,143 0 0.00 1,705 14.66 0.0265
2017-07-19 2017-06-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 20,143 158 0.79 1,487 4.57 0.0239
2017-04-24 2017-03-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 19,985 0 0.00 1,422 5.88 0.0222
2017-02-07 2016-12-31 13F/A-1 AMPHENOL CORP-CL A COMMON STOCK 032095101 19,985 -5,750 -22.34 1,343 -19.63 0.0212
2017-02-01 2016-12-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 19,985 1,343
2016-10-17 2016-09-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 25,735 4,050 18.68 1,671 34.32 0.0275
2016-08-09 2016-06-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 21,685 0 0.00 1,244 -0.80 0.0212
2016-04-19 2016-03-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 21,685 0 0.00 1,254 10.68 0.0218
2016-01-21 2015-12-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 21,685 5,025 30.16 1,133 33.45 0.0210
2015-10-29 2015-09-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 16,660 55 0.33 849 -11.75 0.0142
2015-07-17 2015-06-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 16,605 6,805 69.44 962 66.44 0.0147
2015-04-15 2015-03-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 9,800 9,800 0.00 578 0.0086
2015-01-28 2014-12-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 0 -4,900 -100.00 0 -100.00
2014-10-23 2014-09-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 4,900 0 0.00 489 3.60 0.0076
2014-08-01 2014-06-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 4,900 0 0.00 472 5.12 0.0069
2014-04-11 2014-03-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 4,900 -100 -2.00 449 0.67 0.0067
2014-02-11 2013-12-31 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 5,000 0 0.00 446 15.25 0.0065
2013-11-15 2013-09-30 13F AMPHENOL CORP-CL A COMMON STOCK 032095101 5,000 5,000 387 0.0059
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.