Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionState Street Corp
Latest Disclosed Ownership57,396,418 shares
Latest Disclosed Value $ 7,266,090,298
State Street Corp reports 0.85% increase in ownership of APH / Amphenol Corporation

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 57,396,418 shares of Amphenol Corporation (US:APH) valued at $7,252,037,414 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 56,913,598 shares of Amphenol Corporation. This represents a change in shares of 0.85% during the quarter. The current value of the position is $8,472,859,225 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 57,396,418 482,820 0.85 7,266,090 -5.70 0.2509
2026-02-13 2025-12-31 13F AMPHENOL CORP CL A 032095101 56,913,598 888,526 1.59 7,705,440 10.99 0.2585
2025-11-14 2025-09-30 13F AMPHENOL CORP CL A 032095101 56,025,072 676,797 1.22 6,942,156 26.81 0.2407
2025-08-14 2025-06-30 13F AMPHENOL CORP CL A 032095101 55,348,275 35,729 0.06 5,474,524 50.53 0.2052
2025-05-15 2025-03-31 13F AMPHENOL CORP CL A 032095101 55,312,546 1,178,361 2.18 3,636,899 -3.49 0.1499
2025-02-14 2024-12-31 13F AMPHENOL CORP CL A 032095101 54,134,185 599,969 1.12 3,768,378 7.77 0.1487
2024-11-14 2024-09-30 13F AMPHENOL CORP CL A 032095101 53,534,216 1,537,880 2.96 3,496,777 -0.33 0.1423
2024-08-14 2024-06-30 13F AMPHENOL CORP CL A 032095101 51,996,336 25,143,393 93.63 3,508,527 13.06 0.1533
2024-05-15 2024-03-31 13F AMPHENOL CORP CL A 032095101 26,852,943 267,290 1.01 3,103,283 17.50 0.1387
2024-02-14 2023-12-31 13F AMPHENOL CORP CL A 032095101 26,585,653 957,289 3.74 2,641,196 22.40 0.1285
2023-11-14 2023-09-30 13F AMPHENOL CORP CL A 032095101 25,628,364 -585,725 -2.23 2,157,827 -3.34 0.1196
2023-08-14 2023-06-30 13F AMPHENOL CORP CL A 032095101 26,214,089 1,419,808 5.73 2,232,289 9.89 0.1172
2023-05-15 2023-03-31 13F AMPHENOL CORP CL A 032095101 24,794,281 582,081 2.40 2,031,342 9.89 0.1146
2023-05-15 2022-12-31 13F/A-99 AMPHENOL CORP CL A 032095101 24,212,200 -179,574 -0.74 1,848,557 12.84 0.1086
2023-05-15 2022-12-31 13F AMPHENOL CORP CL A 032095101 24,212,200 -179,574 1,848,557 0.1086
2022-11-15 2022-09-30 13F AMPHENOL CORP CL A 032095101 24,391,774 185,162 0.76 1,638,180 4.80 0.1036
2022-08-15 2022-06-30 13F AMPHENOL CORP CL A 032095101 24,206,612 -656,653 -2.64 1,563,218 -16.78 0.0937
2022-05-16 2022-03-31 13F AMPHENOL CORP CL A 032095101 24,863,265 -898,750 -3.49 1,878,334 -16.82 0.0929
2022-02-14 2021-12-31 13F AMPHENOL CORP CL A 032095101 25,762,015 400,777 1.58 2,258,223 21.35 0.1071
2021-11-15 2021-09-30 13F AMPHENOL CORP CL A 032095101 25,361,238 -55,851 -0.22 1,860,878 6.80 0.0984
2021-08-16 2021-06-30 13F AMPHENOL CORP CL A 032095101 25,417,089 95,604 0.38 1,742,399 4.08 0.0918
2021-07-09 2021-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 25,321,485 12,512,231 97.68 1,674,055 -0.28 0.0960
2021-05-17 2021-03-31 13F AMPHENOL CORP CL A 032095101 25,321,485 12,512,231 1,674,055 0.0960
2021-02-16 2020-12-31 13F AMPHENOL CORP CL A 032095101 12,809,254 -81,621 -0.63 1,678,777 20.00 0.1028
2020-11-10 2020-09-30 13F AMPHENOL CORP CL A 032095101 12,890,875 -212,373 -1.62 1,398,926 11.15 0.0955
2020-08-14 2020-06-30 13F AMPHENOL CORP CL A 032095101 13,103,248 39,311 0.30 1,258,623 31.75 0.0915
2020-06-19 2020-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 13,063,937 -105,060 -0.80 955,307 -33.13 0.0835
2020-05-11 2020-03-31 13F AMPHENOL CORP CL A 032095101 13,063,937 -105,060 955,307 83,895.1899
2020-02-06 2019-12-31 13F AMPHENOL CORP CL A 032095101 13,168,997 43,640 0.33 1,428,530 12.49 0.0978
2019-11-14 2019-09-30 13F AMPHENOL CORP CL A 032095101 13,125,357 416,897 3.28 1,269,863 3.91 0.0946
2019-08-14 2019-06-30 13F AMPHENOL CORP CL A 032095101 12,708,460 590,210 4.87 1,222,079 6.53 0.0911
2019-05-15 2019-03-31 13F AMPHENOL CORP CL A 032095101 12,118,250 382,068 3.26 1,147,188 20.31 0.0895
2019-02-12 2018-12-31 13F AMPHENOL CORP CL A 032095101 11,736,182 -210,548 -1.76 953,533 -15.11 0.0868
2018-11-09 2018-09-30 13F AMPHENOL Common equity shares 032095101 11,946,730 820,802 7.38 1,123,233 15.84 0.0863
2018-08-14 2018-06-30 13F AMPHENOL Common equity shares 032095101 11,125,928 -258,899 -2.27 969,622 -1.12 0.0810
2018-05-15 2018-03-31 13F AMPHENOL Common equity shares 032095101 11,384,827 -441,079 -3.73 980,574 -5.56 0.0833
2018-02-14 2017-12-31 13F AMPHENOL Common equity shares 032095101 11,825,906 187,454 1.61 1,038,308 5.40 0.0835
2017-11-14 2017-09-30 13F HENOL Common equity shares 032095101 11,638,452 -226,669 -1.91 985,077 12.47 0.0850
2017-08-14 2017-06-30 13F AMPHENOL Common equity shares 032095101 11,865,121 -306,747 -2.52 875,891 1.11 0.0775
2017-05-15 2017-03-31 13F AMPHENOL Common equity shares 032095101 12,171,868 203,486 1.70 866,273 7.71 0.0773
2017-02-09 2016-12-31 13F AMPHENOL Common equity shares 032095101 11,968,382 610,698 5.38 804,263 9.08 0.0757
2017-01-13 2016-09-30 13F/A-1 AMPHENOL Common equity shares 032095101 11,357,684 207,756 1.86 737,332 15.35 0.0743
2016-11-14 2016-09-30 13F AMPHENOL Common equity shares 032095101 8,113,916 526,747
2016-08-12 2016-06-30 13F AMPHENOL Common equity shares 032095101 11,149,928 -306,664 -2.68 639,231 -3.50 0.0687
2016-05-20 2016-03-31 13F/A-1 AMPHENOL Common equity shares 032095101 11,456,592 -108,468 -0.94 662,419 9.66 0.0716
2016-05-12 2016-03-31 13F AMPHENOL Common equity shares 032095101 11,456,592 662,419
2016-02-16 2015-12-31 13F AMPHENOL Common equity shares 032095101 11,565,060 200,854 1.77 604,042 4.30 0.0660
2015-11-16 2015-09-30 13F AMPHENOL Common equity shares 032095101 11,364,206 -338,398 -2.89 579,118 -14.64 0.0674
2015-08-13 2015-06-30 13F AMPHENOL Common equity shares 032095101 11,702,604 -538,973 -4.40 678,404 -5.96 0.0725
2015-05-15 2015-03-31 13F AMPHENOL Common equity shares 032095101 12,241,577 -732,514 -5.65 721,395 3.33 0.0740
2015-02-11 2014-12-31 13F AMPHENOL Common equity shares 032095101 12,974,091 6,598,642 103.50 698,135 9.66 0.0695
2014-11-12 2014-09-30 13F/A-1 AMPHENOL Common equity shares 032095101 6,375,449 141,493 2.27 636,662 6.01 0.0685
2014-11-10 2014-09-30 13F AMPHENOL Common equity shares 032095101 6,375,449 636,662
2014-08-12 2014-06-30 13F AMPHENOL Common equity shares 032095101 6,233,956 19,055 0.31 600,580 5.44 0.0649
2014-05-15 2014-03-31 13F/A-1 AMPHENOL Common equity shares 032095101 6,214,901 -331,257 -5.06 569,595 -2.43 0.0647
2014-05-13 2014-03-31 13F AMPHENOL Common equity shares 032095101 6,214,901 569,595
2014-02-06 2013-12-31 13F/A-1 AMPHENOL Common equity shares 032095101 6,546,158 137,438 2.14 583,795 17.72 0.0649
2014-02-06 2013-12-31 13F AMPHENOL Common equity shares 032095101 6,459,106 417,904
2013-11-12 2013-09-30 13F AMPHENOL Common equity shares 032095101 6,408,720 23,098 0.36 495,906 -0.36 0.0611
2013-08-08 2013-06-30 13F AMPHENOL Common equity shares 032095101 6,385,622 6,385,622 497,699 0.0649
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.