Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership4,327,082 shares
Latest Disclosed Value $ 546,462,884
Dimensional Fund Advisors Lp reports 23.16% increase in ownership of APH / Amphenol Corporation

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 4,327,082 shares of Amphenol Corporation (US:APH) valued at $546,726,811 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 3,513,336 shares of Amphenol Corporation. This represents a change in shares of 23.16% during the quarter. The current value of the position is $638,763,845 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)
2026-05-07 2026-03-31 13F AMPHENOL CL A 032095101 4,327,082 813,746 23.16 546,463 15.09 0.1135
2026-02-12 2025-12-31 13F AMPHENOL CORP CL A 032095101 3,513,336 -70,924 -1.98 474,819 7.09 0.0996
2025-11-12 2025-09-30 13F AMPHENOL CORP CL A 032095101 3,584,260 -91,764 -2.50 443,403 22.15 0.0951
2025-08-12 2025-06-30 13F AMPHENOL CORP CL A 032095101 3,676,024 -21,465 -0.58 362,989 49.68 0.0840
2025-05-13 2025-03-31 13F AMPHENOL CORP CL A 032095101 3,697,489 72,280 1.99 242,509 -3.68 0.0603
2025-02-13 2024-12-31 13F AMPHENOL CORP CL A 032095101 3,625,209 197,237 5.75 251,785 12.72 0.0605
2024-11-07 2024-09-30 13F AMPHENOL CORP CL A 032095101 3,427,972 -3,852 -0.11 223,362 -3.40 0.0542
2024-08-09 2024-06-30 13F AMPHENOL CORP CL A 032095101 3,431,824 1,720,856 100.58 231,214 17.15 0.0604
2024-05-10 2024-03-31 13F AMPHENOL CORP CL A 032095101 1,710,968 -114,223 -6.26 197,360 9.08 0.0534
2024-02-07 2023-12-31 13F AMPHENOL CORP CL A 032095101 1,825,191 -9,969 -0.54 180,937 17.38 0.0528
2023-11-09 2023-09-30 13F AMPHENOL CORP CL A 032095101 1,835,160 -21,875 -1.18 154,143 -2.28 0.0506
2023-08-09 2023-06-30 13F AMPHENOL CORP CL A 032095101 1,857,035 14,520 0.79 157,739 4.77 0.0503
2023-05-12 2023-03-31 13F AMPHENOL CORP CL A 032095101 1,842,515 -131,973 -6.68 150,557 100,271.33 0.0507
2023-02-09 2022-12-31 13F AMPHENOL CORP CL A 032095101 1,974,488 -59,905 -2.94 150 -99.89 0.0444
2022-11-10 2022-09-30 13F AMPHENOL CORP CL A 032095101 2,034,393 -2,144 -0.11 136,241 3.92 0.0523
2022-08-12 2022-06-30 13F AMPHENOL CORP CL A 032095101 2,036,537 -20,311 -0.99 131,100 -15.42 0.0470
2022-05-13 2022-03-31 13F AMPHENOL CORP CLA 032095101 2,056,848 -124,229 -5.70 155,004 -18.74 0.0477
2022-02-09 2021-12-31 13F AMPHENOL CORP CLA 032095101 2,181,077 -98,131 -4.31 190,747 14.27 0.0577
2021-11-12 2021-09-30 13F AMPHENOL CORP CLA 032095101 2,279,208 -35,292 -1.52 166,930 5.43 0.0538
2021-08-12 2021-06-30 13F AMPHENOL CORP CLA 032095101 2,314,500 137,794 6.33 158,335 10.27 0.0501
2021-05-14 2021-03-31 13F AMPHENOL CORP CLA 032095101 2,176,706 1,150,006 112.01 143,593 6.95 0.0475
2021-03-08 2020-12-31 13F/A-2 AMPHENOL CORP CLA 032095101 1,026,700 43,962 4.47 134,256 26.18 0.0485
2021-02-11 2020-12-31 13F AMPHENOL CORP CLA 032095101 1,026,700 43,962 134,256 48,486.1311
2020-11-12 2020-09-30 13F AMPHENOL CORP CLA 032095101 982,738 -57,329 -5.51 106,401 6.78 0.0451
2020-08-13 2020-06-30 13F AMPHENOL CORP CLA 032095101 1,040,067 -118,249 -10.21 99,643 18.01 0.0438
2020-05-14 2020-03-31 13F AMPHENOL CORP CLA 032095101 1,158,316 -47,829 -3.97 84,439 -35.32 0.0440
2020-02-14 2019-12-31 13F AMPHENOL CORP CLA 032095101 1,206,145 -6,633 -0.55 130,542 11.55 0.0476
2019-11-12 2019-09-30 13F AMPHENOL CORP CLA 032095101 1,212,778 78,183 6.89 117,029 7.51 0.0455
2019-08-13 2019-06-30 13F AMPHENOL CORP CLA 032095101 1,134,595 20,241 1.82 108,853 3.43 0.0423
2019-08-12 2019-03-31 13F/A-2 AMPHENOL CORP CLA 032095101 1,114,354 91,294 8.92 105,239 26.97 0.0419
2019-05-10 2019-03-31 13F AMPHENOL CORP CLA 032095101 1,114,354 91,294 105,239
2019-02-26 2018-12-31 13F/A-1 AMPHENOL CORP CLA 032095101 1,023,060 127,639 14.25 82,888 -1.54 0.0375
2019-02-13 2018-12-31 13F AMPHENOL CORP CLA 032095101 1,023,060 127,639 82,888
2018-11-13 2018-09-30 13F AMPHENOL CORP CLA 032095101 895,421 10,390 1.17 84,184 9.14 0.0320
2018-08-10 2018-06-30 13F AMPHENOL CORP CLA 032095101 885,031 9,248 1.06 77,131 2.25 0.0307
2018-05-11 2018-03-31 13F AMPHENOL CORP CLA 032095101 875,783 12,899 1.49 75,431 -0.44 0.0314
2018-02-12 2017-12-31 13F AMPHENOL CORP CLA 032095101 862,884 2,553 0.30 75,767 4.07 0.0314
2017-11-13 2017-09-30 13F AMPHENOL CORP CLA 032095101 860,331 -1,886 -0.22 72,807 14.39 0.0318
2017-08-11 2017-06-30 13F AMPHENOL CORP CLA 032095101 862,217 5,301 0.62 63,650 4.36 0.0294
2017-05-12 2017-03-31 13F AMPHENOL CORP CLA 032095101 856,916 14,926 1.77 60,989 7.78 0.0291
2017-02-09 2016-12-31 13F AMPHENOL CORP CLA 032095101 841,990 -21,728 -2.52 56,584 0.91 0.0283
2016-11-10 2016-09-30 13F AMPHENOL CORP CLA 032095101 863,718 7,930 0.93 56,072 14.30 0.0303
2016-08-09 2016-06-30 13F AMPHENOL CORP CLA 032095101 855,788 23,864 2.87 49,058 1.99 0.0282
2016-05-13 2016-03-31 13F AMPHENOL CORP CLA 032095101 831,924 14,399 1.76 48,101 12.64 0.0288
2016-02-10 2015-12-31 13F AMPHENOL CORP CLA 032095101 817,525 48,396 6.29 42,703 8.96 0.0266
2015-11-13 2015-09-30 13F AMPHENOL CORP CLA 032095101 769,129 52,432 7.32 39,191 -5.66 0.0257
2015-08-14 2015-06-30 13F AMPHENOL CORP CLA 032095101 716,697 90,826 14.51 41,543 12.64 0.0254
2015-05-14 2015-03-31 13F AMPHENOL CORP CLA 032095101 625,871 33,047 5.57 36,880 15.60 0.0233
2015-02-06 2014-12-31 13F AMPHENOL CORP CLA 032095101 592,824 327,039 123.05 31,904 20.18 0.0210
2014-11-13 2014-09-30 13F AMPHENOL CORP CLA 032095101 265,785 26,541 11.09 26,547 15.18 0.0188
2014-08-08 2014-06-30 13F AMPHENOL CORP CLA 032095101 239,244 12,962 5.73 23,048 11.14 0.0160
2014-05-14 2014-03-31 13F AMPHENOL CORP CLA 032095101 226,282 10,457 4.85 20,737 7.75 0.0155
2014-02-12 2013-12-31 13F AMPHENOL CORP CLA 032095101 215,825 -45 -0.02 19,246 15.22 0.0150
2013-11-13 2013-09-30 13F AMPHENOL CORP CLA 032095101 215,870 16,641 8.35 16,703 7.54 0.0145
2013-08-15 2013-06-30 13F AMPHENOL CORP CLA 032095101 199,229 199,229 15,532 0.0146
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.