Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionSei Investments Co
Latest Disclosed Ownership2,300,501 shares
Latest Disclosed Value $ 310,890,240
Sei Investments Co reports 6.40% decrease in ownership of APH / Amphenol Corporation

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 2,300,501 shares of Amphenol Corporation (US:APH) valued at $310,889,705 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 2,457,781 shares of Amphenol Corporation. This represents a change in shares of -6.40% during the quarter. The current value of the position is $339,599,958 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)
2026-02-13 2025-12-31 13F AMPHENOL CORP CL A 032095101 2,300,501 -157,280 -6.40 310,890 2.21 0.3069
2025-11-13 2025-09-30 13F AMPHENOL CORP CL A 032095101 2,457,781 1,327,659 117.48 304,154 172.53 0.3271
2025-08-14 2025-06-30 13F AMPHENOL CORP CL A 032095101 1,130,122 40,723 3.74 111,603 56.19 0.1294
2025-05-14 2025-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 1,089,399 195,301 21.84 71,454 15.07 0.0920
2025-05-13 2025-03-31 13F AMPHENOL CORP CL A 032095101 901,607 7,509 60,512 0.0658
2025-02-11 2024-12-31 13F AMPHENOL CORP CL A 032095101 894,098 41,656 4.89 62,095 11.79 0.0797
2024-11-12 2024-09-30 13F AMPHENOL CORP CL A 032095101 852,442 44,434 5.50 55,545 2.04 0.0721
2024-08-13 2024-06-30 13F AMPHENOL CORP CL A 032095101 808,008 506,941 168.38 54,435 56.75 0.0771
2024-05-07 2024-03-31 13F AMPHENOL CORP CL A 032095101 301,067 33,913 12.69 34,728 31.13 0.0509
2024-02-14 2023-12-31 13F AMPHENOL CORP CL A 032095101 267,154 4,562 1.74 26,483 20.07 0.0425
2023-11-14 2023-09-30 13F AMPHENOL CORP CL A 032095101 262,592 36,734 16.26 22,056 14.96 0.0396
2023-08-11 2023-06-30 13F AMPHENOL CORP CL A 032095101 225,858 -79,526 -26.04 19,185 -23.12 0.0335
2023-05-12 2023-03-31 13F AMPHENOL CORP CL A 032095101 305,384 122,905 67.35 24,956 79.62 0.0464
2023-02-10 2022-12-31 13F AMPHENOL CORP CL A 032095101 182,479 -119,690 -39.61 13,894 -31.33 0.0309
2022-11-14 2022-09-30 13F AMPHENOL CORP CL A 032095101 302,169 4,652 1.56 20,233 5.39 0.0451
2022-08-15 2022-06-30 13F AMPHENOL CORP CL A 032095101 297,517 129,157 76.71 19,198 50.98 0.0415
2022-05-13 2022-03-31 13F AMPHENOL CORP CL A 032095101 168,360 6,405 3.95 12,716 -10.17 0.0256
2022-02-14 2021-12-31 13F AMPHENOL CORP CL A 032095101 161,955 12,643 8.47 14,156 29.27 0.0266
2021-11-12 2021-09-30 13F AMPHENOL CORP CL A 032095101 149,312 -3,502 -2.29 10,951 4.00 0.0230
2021-08-06 2021-06-30 13F AMPHENOL CORP CL A 032095101 152,814 70,236 85.05 10,530 2.54 0.0233
2021-05-12 2021-03-31 13F AMPHENOL CORP CL A 032095101 82,578 -5,001 -5.71 10,269 -10.95 0.0259
2021-02-08 2020-12-31 13F AMPHENOL CORP CL A 032095101 87,579 14,717 20.20 11,532 45.40 0.0298
2020-12-04 2020-09-30 13F/A-1 AMPHENOL CORP CL A 032095101 72,862 18,984 35.24 7,931 57.11 0.0230
2020-11-06 2020-09-30 13F AMPHENOL CORP CL A 032095101 77,233 23,355 8,404 20,234.9635
2020-08-17 2020-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 53,878 15,533 40.51 5,048 80.35 0.0157
2020-08-11 2020-06-30 13F AMPHENOL CORP CL A 032095101 54,288 15,943 5,122 13,893.6976
2020-05-14 2020-03-31 13F AMPHENOL CORP CL A 032095101 38,345 405 1.07 2,799 -31.98 0.0103
2020-02-06 2019-12-31 13F AMPHENOL CORP CL A 032095101 37,940 -10,108 -21.04 4,115 -11.05 0.0123
2019-11-12 2019-09-30 13F AMPHENOL CORP CL A 032095101 48,048 -13,102 -21.43 4,626 -21.18 0.0118
2019-08-14 2019-06-30 13F AMPHENOL CORP CL A 032095101 61,150 2,345 3.99 5,869 5.56 0.0192
2019-05-15 2019-03-31 13F AMPHENOL CORP CL A 032095101 58,805 -52,578 -47.20 5,560 -42.26 0.0187
2019-02-13 2018-12-31 13F AMPHENOL CORP CL A 032095101 111,383 32,130 40.54 9,629 28.97 0.0343
2018-11-08 2018-09-30 13F AMPHENOL CORP CL A 032095101 79,253 -122,218 -60.66 7,466 -57.48 0.0271
2018-08-03 2018-06-30 13F AMPHENOL CORP CL A 032095101 201,471 201,471 17,558 0.0597
2018-05-11 2018-03-31 13F AMPHENOL CORP CL A 032095101 0 -145,010 -100.00 0 -100.00
2018-02-08 2017-12-31 13F AMPHENOL CORP CL A 032095101 145,010 -58,487 -28.74 12,740 -24.42 0.0442
2017-11-06 2017-09-30 13F AMPHENOL CORP CL A 032095101 203,497 30,073 17.34 16,856 31.67 0.0599
2017-07-31 2017-06-30 13F AMPHENOL CORP CL A 032095101 173,424 49,257 39.67 12,802 44.85 0.0510
2017-05-05 2017-03-31 13F AMPHENOL CORP CL A 032095101 124,167 89,256 255.67 8,838 213.96 0.0387
2017-02-02 2016-12-31 13F AMPHENOL CORP CL A 032095101 34,911 -36,922 -51.40 2,815 -39.64 0.0136
2016-11-04 2016-09-30 13F AMPHENOL CORP CL A 032095101 71,833 33,476 87.27 4,664 112.10 0.0237
2016-08-11 2016-06-30 13F AMPHENOL CORP CL A 032095101 38,357 15,576 68.37 2,199 67.10 0.0132
2016-05-10 2016-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 22,781 -41,961 -64.81 1,316 -61.09 0.0082
2016-02-03 2015-12-31 13F AMPHENOL CORP CL A 032095101 64,742 -1,137 -1.73 3,382 0.71 0.0206
2015-11-02 2015-09-30 13F/A-1 AMPHENOL CORP CL A 032095101 65,879 -11,425 -14.78 3,358 -25.06 0.0308
2015-10-30 2015-09-30 13F AMPHENOL CORP CL A 032095101 65,879 3,358
2015-08-07 2015-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 77,304 -253 -0.33 4,481 -1.95 0.0405
2015-08-04 2015-06-30 13F AMPHENOL CORP CL A 032095101 77,304 -253 4,481 0.0405
2015-05-14 2015-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 77,557 -74 -0.10 4,570 9.41 0.0397
2015-05-01 2015-03-31 13F AMPHENOL CORP CL A 032095101 77,557 4,570
2015-02-10 2014-12-31 13F AMPHENOL CORP CL A 032095101 77,631 77,631 4,177 0.0369
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.