Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionFirst Manhattan Co
Latest Disclosed Ownership158,111 shares
Latest Disclosed Value $ 20,016,828
First Manhattan Co reports 1.74% decrease in ownership of APH / Amphenol Corporation

On May 15, 2026 - First Manhattan Co filed a 13F-HR form disclosing ownership of 158,111 shares of Amphenol Corporation (US:APH) valued at $19,977,325 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 160,917 shares of Amphenol Corporation. This represents a change in shares of -1.74% during the quarter. The current value of the position is $23,340,346 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 158,111 -2,806 -1.74 20,017 -8.12 0.0555
2026-02-17 2025-12-31 13F AMPHENOL CORP CL A 032095101 160,917 -31,531 -16.38 21,786 -8.64 0.0572
2025-11-14 2025-09-30 13F AMPHENOL CORP CL A 032095101 192,448 -70 -0.04 23,847 25.23 0.0630
2025-08-14 2025-06-30 13F AMPHENOL CORP CL A 032095101 192,518 6,000 3.22 19,043 55.33 0.0538
2025-05-15 2025-03-31 13F AMPHENOL CORP CL A 032095101 186,518 164,986 766.24 12,260 718.36 0.0358
2025-02-14 2024-12-31 13F AMPHENOL CORP CL A 032095101 21,532 -9,070 -29.64 1,499 -25.06 0.0044
2024-11-14 2024-09-30 13F AMPHENOL CORP CL A 032095101 30,602 1,000 3.38 1,999 0.10 0.0059
2024-08-15 2024-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 29,602 14,101 90.97 1,998 11.69 0.0064
2024-08-14 2024-06-30 13F AMPHENOL CORP CL A 032095101 29,602 14,101 1,998 0.0064
2024-05-15 2024-03-31 13F AMPHENOL CORP CL A 032095101 15,501 0 0.00 1,788 16.41 0.0058
2024-02-13 2023-12-31 13F AMPHENOL CORP CL A 032095101 15,501 -69 -0.44 1,537 17.52 0.0053
2023-11-14 2023-09-30 13F AMPHENOL CORP CL A 032095101 15,570 -3,549 -18.56 1,308 -19.52 0.0048
2023-08-14 2023-06-30 13F AMPHENOL CORP CL A 032095101 19,119 -7,100 -27.08 1,624 -24.18 0.0059
2023-05-15 2023-03-31 13F AMPHENOL CORP CL A 032095101 26,219 -77 -0.29 2,143 6.99 0.0082
2023-02-14 2022-12-31 13F AMPHENOL CORP CL A 032095101 26,296 317 1.22 2,002 15.12 0.0073
2022-11-14 2022-09-30 13F AMPHENOL CORP CL A 032095101 25,979 0 0.00 1,739 4.01 0.0074
2022-08-15 2022-06-30 13F AMPHENOL CORP CL A 032095101 25,979 1,135 4.57 1,672 -10.64 0.0067
2022-05-16 2022-03-31 13F AMPHENOL CORP CL A 032095101 24,844 1,410 6.02 1,871 -8.69 0.0061
2022-02-14 2021-12-31 13F AMPHENOL CORP CL A 032095101 23,434 -1,446 -5.81 2,049 12.52 0.0068
2021-11-15 2021-09-30 13F AMPHENOL CORP CL A 032095101 24,880 -2,360 -8.66 1,821 -2.25 0.0067
2021-08-16 2021-06-30 13F AMPHENOL CORP CL A 032095101 27,240 0 0.00 1,863 3.67 0.0068
2021-05-14 2021-03-31 13F AMPHENOL CORP CL A 032095101 27,240 8,125 42.51 1,797 -28.09 0.0077
2021-02-16 2020-12-31 13F AMPHENOL CORP CL A 032095101 19,115 -530 -2.70 2,499 17.54 0.0120
2020-11-12 2020-09-30 13F AMPHENOL CLASS A 032095101 19,645 0 0.00 2,126 12.96 0.0110
2020-08-14 2020-06-30 13F AMPHENOL CLASS A 032095101 19,645 12,645 180.64 1,882 269.02 0.0109
2020-05-06 2020-03-31 13F AMPHENOL CLASS A 032095101 7,000 0 0.00 510 -32.63 0.0033
2020-02-13 2019-12-31 13F AMPHENOL CLASS A 032095101 7,000 0 0.00 757 12.15 0.0038
2019-11-13 2019-09-30 13F AMPHENOL CLASS A 032095101 7,000 -37 -0.53 675 0.00 0.0037
2019-08-16 2019-06-30 13F AMPHENOL CLASS A 032095101 7,037 0 0.00 675 1.66 0.0037
2019-04-12 2019-03-31 13F AMPHENOL CLASS A 032095101 7,037 37 0.53 664 17.11 0.0038
2019-01-30 2018-12-31 13F AMPHENOL CLASS A 032095101 7,000 0 0.00 567 -13.83 0.0035
2018-10-15 2018-09-30 13F AMPHENOL CLASS A 032095101 7,000 0 0.00 658 7.87 0.0035
2018-08-01 2018-06-30 13F AMPHENOL CLASS A 032095101 7,000 0 0.00 610 1.33 0.0035
2018-04-20 2018-03-31 13F AMPHENOL CLASS A 032095101 7,000 -5,213 -42.68 602 -43.84 0.0034
2018-01-22 2017-12-31 13F AMPHENOL CLASS A 032095101 12,213 5,213 74.47 1,072 81.08 0.0059
2017-10-25 2017-09-30 13F AMPHENOL CLASS A 032095101 7,000 0 0.00 592 14.73 0.0034
2017-08-10 2017-06-30 13F/A-2 AMPHENOL CLASS A 032095101 7,000 0 0.00 516 3.61 0.0030
2017-08-01 2017-06-30 13F/A-1 AMPHENOL CLASS A 032095101 7,000 0 516 0.0030
2017-04-25 2017-03-31 13F/A-1 AMPHENOL CLASS A 032095101 7,000 0 0.00 498 5.96 0.0030
2017-04-24 2017-03-31 13F AMPHENOL CLASS A 032095101 7,000 454
2017-01-25 2016-12-31 13F AMPHENOL CLASS A 032095101 7,000 0 0.00 470 3.52 0.0029
2016-10-20 2016-09-30 13F AMPHENOL CLASS A 032095101 7,000 0 0.00 454 13.22 0.0028
2016-07-14 2016-06-30 13F AMPHENOL CLASS A 032095101 7,000 0 0.00 401 -0.74 0.0025
2016-04-22 2016-03-31 13F AMPHENOL CLASS A 032095101 7,000 0 0.00 404 10.68 0.0025
2016-01-20 2015-12-31 13F AMPHENOL CLASS A 032095101 7,000 0 0.00 365 2.53 0.0022
2015-10-26 2015-09-30 13F AMPHENOL CLASS A 032095101 7,000 0 0.00 356 -12.10 0.0023
2015-07-17 2015-06-30 13F AMPHENOL CLASS A 032095101 7,000 0 0.00 405 -1.70 0.0024
2015-04-30 2015-03-31 13F AMPHENOL CLASS A 032095101 7,000 0 0.00 412 9.57 0.0024
2015-01-20 2014-12-31 13F AMPHENOL CLASS A 032095101 7,000 3,500 100.00 376 7.74 0.0021
2014-10-23 2014-09-30 13F AMPHENOL CLASS A 032095101 3,500 0 0.00 349 3.56 0.0020
2014-08-14 2014-06-30 13F/A-1 AMPHENOL CLASS A 032095101 3,500 0 0.00 337 5.31 0.0021
2014-05-16 2014-03-31 13F AMPHENOL CLASS A 032095101 3,500 0 0.00 320 2.56 0.0021
2014-02-04 2013-12-31 13F AMPHENOL CLASS A 032095101 3,500 0 0.00 312 15.56 0.0021
2013-10-29 2013-09-30 13F AMPHENOL CLASS A 032095101 3,500 0 0.00 270 0.00 0.0019
2013-08-13 2013-06-30 13F AMPHENOL CLASS A 032095101 3,500 3,500 270 0.0019
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.