Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionCalamos Advisors LLC
Latest Disclosed Ownership297,447 shares
Latest Disclosed Value $ 37,582,429
Calamos Advisors LLC reports 0.97% decrease in ownership of APH / Amphenol Corporation

On May 4, 2026 - Calamos Advisors LLC filed a 13F-HR form disclosing ownership of 297,447 shares of Amphenol Corporation (US:APH) valued at $37,582,428 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 300,354 shares of Amphenol Corporation. This represents a change in shares of -0.97% during the quarter. The current value of the position is $41,288,618 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)
2026-05-04 2026-03-31 13F AMPHENOL CL A 032095101 297,447 -2,907 -0.97 37,582 -7.41 0.1326
2026-01-29 2025-12-31 13F AMPHENOL CORP CL A 032095101 300,354 -6,664 -2.17 40,590 6.83 0.1524
2025-10-20 2025-09-30 13F AMPHENOL CORP CL A 032095101 307,018 410 0.13 37,993 25.48 0.1403
2025-08-08 2025-06-30 13F AMPHENOL CORP CL A 032095101 306,608 0 0.00 30,278 50.56 0.1192
2025-04-29 2025-03-31 13F AMPHENOL CORP CL A 032095101 306,608 3,415 1.13 20,110 -4.49 0.0875
2025-01-24 2024-12-31 13F AMPHENOL CORP CL A 032095101 303,193 0 0.00 21,057 6.58 0.0881
2024-11-07 2024-09-30 13F AMPHENOL CORP CL A 032095101 303,193 -7,439 -2.39 19,756 -5.60 0.0854
2024-07-25 2024-06-30 13F AMPHENOL CORP CL A 032095101 310,632 149,647 92.96 20,927 12.70 0.0929
2024-05-08 2024-03-31 13F AMPHENOL CORP CL A 032095101 160,985 -4,049 -2.45 18,570 13.51 0.0880
2024-01-31 2023-12-31 13F AMPHENOL CORP CL A 032095101 165,034 -2,155 -1.29 16,360 16.50 0.0794
2023-10-26 2023-09-30 13F AMPHENOL CORP CL A 032095101 167,189 0 0.00 14,042 -1.13 0.0730
2023-07-28 2023-06-30 13F AMPHENOL CORP CL A 032095101 167,189 0 0.00 14,203 3.95 0.0703
2023-05-04 2023-03-31 13F AMPHENOL CORP CL A 032095101 167,189 -20,902 -11.11 13,663 -4.60 0.0667
2023-01-26 2022-12-31 13F AMPHENOL CORP CL A 032095101 188,091 -33,255 -15.02 14,321 -3.37 0.0672
2022-10-24 2022-09-30 13F AMPHENOL CORP CL A 032095101 221,346 0 0.00 14,821 4.01 0.0678
2022-08-01 2022-06-30 13F AMPHENOL CORP CL A 032095101 221,346 5,961 2.77 14,250 -12.19 0.0615
2022-05-03 2022-03-31 13F AMPHENOL CORP CL A 032095101 215,385 28,709 15.38 16,229 -0.60 0.0609
2022-02-01 2021-12-31 13F AMPHENOL CORP CL A 032095101 186,676 7,227 4.03 16,327 24.24 0.0610
2021-10-26 2021-09-30 13F AMPHENOL CORP CL A 032095101 179,449 15,834 9.68 13,141 17.40 0.0574
2021-07-22 2021-06-30 13F AMPHENOL CORP CL A 032095101 163,615 37,215 29.44 11,193 34.22 0.0511
2021-04-12 2021-03-31 13F AMPHENOL CORP CL A 032095101 126,400 65,153 106.38 8,339 4.12 0.0455
2021-01-27 2020-12-31 13F AMPHENOL CORP CL A 032095101 61,247 -2,651 -4.15 8,009 15.77 0.0465
2020-10-26 2020-09-30 13F AMPHENOL CORP CL A 032095101 63,898 -5,609 -8.07 6,918 3.89 0.0445
2020-07-27 2020-06-30 13F AMPHENOL CORP CL A 032095101 69,507 -4,447 -6.01 6,659 23.54 0.0471
2020-04-28 2020-03-31 13F AMPHENOL CORP CL A 032095101 73,954 -6,290 -7.84 5,390 -37.94 0.0423
2020-01-15 2019-12-31 13F AMPHENOL COMMON STOCK 032095101 80,244 -1,315 -1.61 8,685 10.36 0.0429
2019-10-21 2019-09-30 13F AMPHENOL COMMON STOCK 032095101 81,559 7,082 9.51 7,870 10.15 0.0429
2019-08-07 2019-06-30 13F AMPHENOL COMMON STOCK 032095101 74,477 -14,597 -16.39 7,145 -15.06 0.0397
2019-04-12 2019-03-31 13F AMPHENOL COMMON STOCK 032095101 89,074 844 0.96 8,412 17.68 0.0525
2019-01-24 2018-12-31 13F AMPHENOL COMMON STOCK 032095101 88,230 13,208 17.61 7,148 1.33 0.0472
2018-10-22 2018-09-30 13F AMPHENOL COMMON STOCK 032095101 75,022 4,745 6.75 7,054 15.17 0.0388
2018-07-17 2018-06-30 13F AMPHENOL COMMON STOCK 032095101 70,277 8,317 13.42 6,125 14.76 0.0374
2018-04-13 2018-03-31 13F AMPHENOL COMMON STOCK 032095101 61,960 2,922 4.95 5,337 2.95 0.0347
2018-02-13 2017-12-31 13F AMPHENOL COMMON STOCK 032095101 59,038 -1,250 -2.07 5,184 1.59 0.0264
2017-10-25 2017-09-30 13F AMPHENOL COMMON STOCK 032095101 60,288 2,205 3.80 5,103 19.01 0.0395
2017-08-09 2017-06-30 13F AMPHENOL COMMON STOCK 032095101 58,083 17,926 44.64 4,288 50.03 0.0317
2017-04-20 2017-03-31 13F AMPHENOL COMMON STOCK 032095101 40,157 7 0.02 2,858 5.93 0.0225
2017-02-06 2016-12-31 13F AMPHENOL COMMON STOCK 032095101 40,150 -539 -1.32 2,698 2.12 0.0214
2016-11-14 2016-09-30 13F AMPHENOL COMMON STOCK 032095101 40,689 40 0.10 2,642 13.39 0.0189
2016-07-26 2016-06-30 13F AMPHENOL COMMON STOCK 032095101 40,649 15 0.04 2,330 -0.81 0.0163
2016-04-25 2016-03-31 13F AMPHENOL COMMON STOCK 032095101 40,634 2,537 6.66 2,349 18.04 0.0156
2016-02-05 2015-12-31 13F AMPHENOL COMMON STOCK 032095101 38,097 0 0.00 1,990 2.52 0.0126
2015-11-10 2015-09-30 13F AMPHENOL COMMON STOCK 032095101 38,097 13 0.03 1,941 -12.09 0.0134
2015-08-14 2015-06-30 13F AMPHENOL CORP- CL A COMMON STOCK 032095101 38,084 -2,148 -5.34 2,208 -6.87 0.0136
2015-05-13 2015-03-31 13F AMPHENOL COMMON STOCK 032095101 40,232 23 0.06 2,371 9.57 0.0149
2015-02-13 2014-12-31 13F AMPHENOL COMMON STOCK 032095101 40,209 20,209 101.05 2,164 8.36 0.0143
2014-11-14 2014-09-30 13F AMPHENOL COMMON STOCK 032095101 20,000 -2,350 -10.51 1,997 -7.25 0.0133
2014-08-14 2014-06-30 13F AMPHENOL COMMON STOCK 032095101 22,350 2,350 11.75 2,153 17.46 0.0136
2014-05-16 2014-03-31 13F AMPHENOL COMMON STOCK 032095101 20,000 0 0.00 1,833 2.75 0.0117
2014-02-14 2013-12-31 13F AMPHENOL COMMON STOCK 032095101 20,000 0 0.00 1,784 15.25 0.0113
2013-11-14 2013-09-30 13F AMPHENOL COMMON STOCK 032095101 20,000 0 0.00 1,548 -0.71 0.0097
2013-08-12 2013-06-30 13F AMPHENOL COMMON STOCK 032095101 20,000 20,000 1,559 0.0102
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.