Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionStifel Financial Corp
Latest Disclosed Ownership3,707,682 shares
Latest Disclosed Value $ 468,470,378
Stifel Financial Corp reports 1.54% increase in ownership of APH / Amphenol Corporation

On May 12, 2026 - Stifel Financial Corp filed a 13F-HR form disclosing ownership of 3,707,682 shares of Amphenol Corporation (US:APH) valued at $468,465,621 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 3,651,629 shares of Amphenol Corporation. This represents a change in shares of 1.54% during the quarter. The current value of the position is $547,328,017 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)
2026-05-12 2026-03-31 13F AMPHENOL CL A 032095101 3,707,682 56,053 1.54 468,470 -5.07 0.1010
2026-02-13 2025-12-31 13F AMPHENOL CORP CL A 032095101 3,651,629 -346,681 -8.67 493,484 -0.27 0.4439
2025-11-12 2025-09-30 13F AMPHENOL CORP CL A 032095101 3,998,310 -1,536,085 -27.76 494,798 -9.46 0.4517
2025-08-14 2025-06-30 13F AMPHENOL CORP CL A 032095101 5,534,395 -1,123,482 -16.87 546,527 25.15 0.5316
2025-05-14 2025-03-31 13F AMPHENOL CORP CL A 032095101 6,657,877 -229,278 -3.33 436,692 -8.70 0.4642
2025-02-13 2024-12-31 13F AMPHENOL CORP CL A 032095101 6,887,155 117,518 1.74 478,315 8.43 0.4982
2024-11-14 2024-09-30 13F AMPHENOL CORP CL A 032095101 6,769,637 -245,024 -3.49 441,110 -6.66 0.4626
2024-08-13 2024-06-30 13F AMPHENOL CORP CL A 032095101 7,014,661 3,375,420 92.75 472,578 12.58 0.5318
2024-05-14 2024-03-31 13F AMPHENOL CORP CL A 032095101 3,639,241 -64,381 -1.74 419,789 14.34 0.4783
2024-02-12 2023-12-31 13F AMPHENOL CORP CL A 032095101 3,703,622 -63,718 -1.69 367,142 16.03 0.4620
2023-11-13 2023-09-30 13F AMPHENOL CORP CL A 032095101 3,767,340 40,705 1.09 316,424 -0.05 0.4448
2023-08-14 2023-06-30 13F AMPHENOL CORP CL A 032095101 3,726,635 211,261 6.01 316,578 10.20 0.4332
2023-05-12 2023-03-31 13F AMPHENOL CORP CL A 032095101 3,515,374 3,145,476 850.36 287,277 920.01 0.4118
2023-02-13 2022-12-31 13F AMPHENOL CORP CL A 032095101 369,898 37,314 11.22 28,164 26.47 0.0423
2022-11-14 2022-09-30 13F AMPHENOL CORP CL A 032095101 332,584 -20,256 -5.74 22,269 -1.97 0.0365
2022-08-15 2022-06-30 13F AMPHENOL CORP CL A 032095101 352,840 -18,674 -5.03 22,717 -18.85 0.0356
2022-05-13 2022-03-31 13F AMPHENOL CORP CL A 032095101 371,514 72,721 24.34 27,994 7.13 0.0382
2022-02-14 2021-12-31 13F AMPHENOL CORP CL A 032095101 298,793 -28,159 -8.61 26,132 9.14 0.0345
2021-11-15 2021-09-30 13F AMPHENOL CORP CL A 032095101 326,952 66,446 25.51 23,944 34.36 0.0351
2021-08-13 2021-06-30 13F AMPHENOL CORP CL A 032095101 260,506 7,665 3.03 17,821 6.85 0.0267
2021-05-14 2021-03-31 13F AMPHENOL CORP CL A 032095101 252,841 137,355 118.94 16,679 10.44 0.0275
2021-02-12 2020-12-31 13F AMPHENOL CORP CL A 032095101 115,486 3,805 3.41 15,103 24.90 0.0269
2020-11-16 2020-09-30 13F AMPHENOL CORP CL A 032095101 111,681 19,147 20.69 12,092 36.39 0.0249
2020-08-14 2020-06-30 13F AMPHENOL CORP CL A 032095101 92,534 4,974 5.68 8,866 38.79 0.0204
2020-05-14 2020-03-31 13F AMPHENOL CORP CL A 032095101 87,560 -71,420 -44.92 6,388 -62.87 0.0176
2020-02-13 2019-12-31 13F AMPHENOL CORP CL A 032095101 158,980 65,972 70.93 17,206 91.77 0.0358
2019-11-19 2019-09-30 13F/A-1 AMPHENOL CORP CL A 032095101 93,008 -72,237 -43.72 8,972 -43.40 0.0229
2019-11-13 2019-09-30 13F AMPHENOL CORP CL A 032095101 93,008 -72,237 8,972 5,029.2557
2019-08-14 2019-06-30 13F AMPHENOL CORP CL A 032095101 165,245 68,826 71.38 15,852 74.41 0.0409
2019-05-14 2019-03-31 13F AMPHENOL CORP CL A 032095101 96,419 -43,752 -31.21 9,089 -19.98 0.0257
2019-02-13 2018-12-31 13F AMPHENOL CORP CL A 032095101 140,171 -6,541 -4.46 11,358 -17.62 0.0367
2018-11-13 2018-09-30 13F AMPHENOL CORP CL A 032095101 146,712 7,545 5.42 13,788 13.85 0.0395
2018-08-14 2018-06-30 13F AMPHENOL CORP CL A 032095101 139,167 1,723 1.25 12,111 2.49 0.0372
2018-05-11 2018-03-31 13F AMPHENOL CORP CL A 032095101 137,444 -15,198 -9.96 11,817 -11.73 0.0373
2018-02-14 2017-12-31 13F AMPHENOL CORP CL A 032095101 152,642 -1,167 -0.76 13,388 3.00 0.0424
2017-11-13 2017-09-30 13F AMPHENOL CORP CL A 032095101 153,809 15,740 11.40 12,998 27.32 0.0451
2017-08-14 2017-06-30 13F AMPHENOL CORP CL A 032095101 138,069 -8,194 -5.60 10,209 -1.94 0.0379
2017-05-10 2017-03-31 13F AMPHENOL CORP CL A 032095101 146,263 243 0.17 10,411 6.07 0.0403
2017-02-16 2016-12-31 13F AMPHENOL CORP CL A 032095101 146,020 -103,211 -41.41 9,815 -39.31 0.0417
2016-11-15 2016-09-30 13F AMPHENOL CORP CL A 032095101 249,231 -1,110 -0.44 16,173 12.68 0.0727
2016-08-17 2016-06-30 13F AMPHENOL CORP CL A 032095101 250,341 9,836 4.09 14,353 3.22 0.0664
2016-05-16 2016-03-31 13F AMPHENOL CORP CL A 032095101 240,505 16,022 7.14 13,905 18.58 0.0741
2016-03-21 2015-12-31 13F/A-2 AMPHENOL CORP CL A 032095101 224,483 46,924 26.43 11,726 29.60 0.0611
2016-02-26 2015-12-31 13F/A-1 AMPHENOL CORP CL A 032095101 169,844 -54,639 8,491 0.0444
2016-02-16 2015-12-31 13F AMPHENOL CORP CL A 032095101 169,844 8,777
2015-11-16 2015-09-30 13F AMPHENOL CORP CL A 032095101 177,559 7,359 4.32 9,048 -8.16 0.0508
2015-08-17 2015-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 170,200 5,973 3.64 9,852 1.75 0.0509
2015-08-17 2015-06-30 13F AMPHENOL CORP CL A 032095101 167,133 9,682
2015-05-14 2015-03-31 13F AMPHENOL CORP CL A 032095101 164,227 -725 -0.44 9,683 9.19 0.0530
2015-02-13 2014-12-31 13F AMPHENOL CORP CL A 032095101 164,952 51,689 45.64 8,868 50.23 0.0493
2014-11-13 2014-09-30 13F AMPHENOL CORP CL A 032095101 113,263 55,036 94.52 5,903 5.22 0.0518
2014-08-14 2014-06-30 13F AMPHENOL CORP CL A 032095101 58,227 -659 -1.12 5,610 3.95 0.0504
2014-05-15 2014-03-31 13F AMPHENOL CORP CL A 032095101 58,886 58,886 5,397 0.0516
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.