암페놀 주식회사
MX ˙ BMV ˙ US0320951017
SecurityMX:APH / Amphenol Corporation
InstitutionBlair William & Co/il
Latest Disclosed Ownership2,520,319 shares
Latest Disclosed Value $ 318,442,307
Blair William & Co/il reports 5.03% decrease in ownership of APH / Amphenol Corporation

On May 8, 2026 - Blair William & Co/il filed a 13F-HR form disclosing ownership of 2,520,319 shares of Amphenol Corporation (MX:APH) valued at $318,442,307 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 2,653,891 shares of Amphenol Corporation. This represents a change in shares of -5.03% during the quarter.

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)
2026-05-08 2026-03-31 13F AMPHENOL CL A 032095101 2,520,319 -133,572 -5.03 318,442 -11.21 0.9125
2026-02-17 2025-12-31 13F AMPHENOL CORP CL A 032095101 2,653,891 -97,623 -3.55 358,647 5.33 0.9626
2025-11-12 2025-09-30 13F AMPHENOL CORP CL A 032095101 2,751,514 -219,934 -7.40 340,500 16.04 0.9063
2025-07-24 2025-06-30 13F AMPHENOL CORP CL A 032095101 2,971,448 -55,902 -1.85 293,430 47.78 0.8150
2025-05-09 2025-03-31 13F AMPHENOL CORP CL A 032095101 3,027,350 -42,844 -1.40 198,564 -6.88 0.5989
2025-02-12 2024-12-31 13F AMPHENOL CORP CL A 032095101 3,070,194 -22,496 -0.73 213,225 5.81 0.6202
2024-11-12 2024-09-30 13F AMPHENOL CORP CL A 032095101 3,092,690 -39,794 -1.27 201,520 -4.51 0.5918
2024-08-12 2024-06-30 13F AMPHENOL CORP CL A 032095101 3,132,484 1,596,110 103.89 211,035 19.08 0.6509
2024-05-09 2024-03-31 13F AMPHENOL CORP CL A 032095101 1,536,374 4,249 0.28 177,221 16.68 0.5566
2024-02-12 2023-12-31 13F AMPHENOL CORP CL A 032095101 1,532,125 -12,645 -0.82 151,880 17.06 0.5175
2023-11-09 2023-09-30 13F AMPHENOL CORP CL A 032095101 1,544,770 364 0.02 129,745 -1.11 0.4976
2023-08-11 2023-06-30 13F AMPHENOL CORP CL A 032095101 1,544,406 10,607 0.69 131,197 4.67 0.4806
2023-05-12 2023-03-31 13F AMPHENOL CORP CL A 032095101 1,533,799 2,373 0.15 125,342 7.50 0.5007
2023-02-10 2022-12-31 13F AMPHENOL CORP CL A 032095101 1,531,426 14,634 0.96 116,603 14.81 0.5070
2022-11-09 2022-09-30 13F AMPHENOL CORP CL A 032095101 1,516,792 -7,275 -0.48 101,564 3.51 0.4665
2022-08-10 2022-06-30 13F AMPHENOL CORP CL A 032095101 1,524,067 -7,790 -0.51 98,119 -14.99 0.4353
2022-05-13 2022-03-31 13F AMPHENOL CORP CL A 032095101 1,531,857 -6,403 -0.42 115,425 -14.21 0.4046
2022-02-14 2021-12-31 13F AMPHENOL CORP CL A 032095101 1,538,260 13,041 0.86 134,536 20.45 0.4220
2021-11-12 2021-09-30 13F AMPHENOL CORP CL A 032095101 1,525,219 -13,959 -0.91 111,692 6.08 0.3802
2021-08-12 2021-06-30 13F AMPHENOL CORP CL A 032095101 1,539,178 -24,543 -1.57 105,295 2.07 0.3649
2021-05-13 2021-03-31 13F AMPHENOL CORP CL A 032095101 1,563,721 763,337 95.37 103,159 -1.44 0.3892
2021-02-09 2020-12-31 13F AMPHENOL CORP CL A 032095101 800,384 26,070 3.37 104,666 24.85 0.3837
2020-11-06 2020-09-30 13F AMPHENOL CORP CL A 032095101 774,314 -20,945 -2.63 83,835 10.03 0.3556
2020-08-12 2020-06-30 13F AMPHENOL CORP CL A 032095101 795,259 3,145 0.40 76,194 31.99 0.3633
2020-05-11 2020-03-31 13F AMPHENOL CORP CL A 032095101 792,114 -6,808 -0.85 57,729 -33.24 0.3608
2020-02-13 2019-12-31 13F AMPHENOL CORP CL A 032095101 798,922 -7,033 -0.87 86,467 11.18 0.4444
2019-11-12 2019-09-30 13F AMPHENOL CORP CL A 032095101 805,955 -9,587 -1.18 77,775 -0.60 0.4481
2019-08-13 2019-06-30 13F AMPHENOL CORP CL A 032095101 815,542 -15,259 -1.84 78,243 -0.28 0.4474
2019-05-14 2019-03-31 13F AMPHENOL CORP CL A 032095101 830,801 -32,680 -3.78 78,461 12.15 0.4783
2019-02-14 2018-12-31 13F AMPHENOL CORP CL A 032095101 863,481 -13,067 -1.49 69,959 -15.11 0.5109
2018-11-13 2018-09-30 13F AMPHENOL CORP CL A 032095101 876,548 -24,203 -2.69 82,413 4.98 0.5049
2018-08-13 2018-06-30 13F AMPHENOL CORP CL A 032095101 900,751 -18,423 -2.00 78,500 -0.84 0.5339
2018-05-15 2018-03-31 13F AMPHENOL CORP CL A 032095101 919,174 -17,351 -1.85 79,168 -3.72 0.5598
2018-02-14 2017-12-31 13F AMPHENOL CORP CL A 032095101 936,525 -12,708 -1.34 82,227 2.34 0.5582
2017-11-13 2017-09-30 13F AMPHENOL CORP-CL A COM 032095101 949,233 -30,354 -3.10 80,343 11.10 0.6025
2017-08-04 2017-06-30 13F AMPHENOL CORP-CL A COM 032095101 979,587 -14,045 -1.41 72,313 2.38 0.5430
2017-05-10 2017-03-31 13F AMPHENOL CORP-CL A COM 032095101 993,632 20,912 2.15 70,633 8.06 0.5692
2017-02-14 2016-12-31 13F AMPHENOL CORP-CL A COM 032095101 972,720 -8,051 -0.82 65,367 2.66 0.5847
2016-11-14 2016-09-30 13F AMPHENOL CORP-CL A COM 032095101 980,771 -10,249 -1.03 63,672 12.07 0.5628
2016-08-08 2016-06-30 13F AMPHENOL CORP-CL A COM 032095101 991,020 -9,100 -0.91 56,815 -1.75 0.5298
2016-05-16 2016-03-31 13F AMPHENOL CORP-CL A COM 032095101 1,000,120 21,619 2.21 57,826 13.15 0.5444
2016-02-16 2015-12-31 13F AMPHENOL CORP-CL A COM 032095101 978,501 51,674 5.58 51,107 8.21 0.4798
2015-11-12 2015-09-30 13F AMPHENOL CORP-CL A COM 032095101 926,827 6,109 0.66 47,231 -11.51 0.4086
2015-08-03 2015-06-30 13F AMPHENOL CORP-CL A COM 032095101 920,718 -30,167 -3.17 53,374 -4.75 0.0798
2015-05-11 2015-03-31 13F AMPHENOL CORP-CL A COM 032095101 950,885 950,885 0.00 56,035 0.0863
2015-02-05 2014-12-31 13F AMPHENOL CORP-CL A COM 032095101 0 -487,189 -100.00 0 -100.00
2014-11-04 2014-09-30 13F AMPHENOL CORP-CL A COM 032095101 487,189 -580,644 -54.38 48,650 -52.71 0.0832
2014-08-01 2014-06-30 13F AMPHENOL CORP-CL A COM 032095101 1,067,833 -112,265 -9.51 102,874 -4.88 0.1680
2014-05-06 2014-03-31 13F AMPHENOL CORP-CL A COM 032095101 1,180,098 -202,049 -14.62 108,155 -12.25 0.1789
2014-02-11 2013-12-31 13F AMPHENOL CORP-CL A COM 032095101 1,382,147 -23,531 -1.67 123,259 13.32 0.2037
2013-11-12 2013-09-30 13F AMPHENOL CORP-CL A COM 032095101 1,405,678 -94,551 -6.30 108,771 -6.98 0.1934
2013-08-07 2013-06-30 13F AMPHENOL CORP-CL A COM 032095101 1,500,229 1,500,229 116,927 0.2312
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.