Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionMorgan Stanley
Latest Disclosed Ownership17,512,450 shares
Latest Disclosed Value $ 2,212,698,455
Morgan Stanley reports 3.70% decrease in ownership of APH / Amphenol Corporation

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 17,512,450 shares of Amphenol Corporation (US:APH) valued at $2,212,698,058 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 18,185,947 shares of Amphenol Corporation. This represents a change in shares of -3.70% during the quarter. The current value of the position is $2,585,187,869 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 17,512,450 -673,497 -3.70 2,212,698 -9.97 0.1333
2026-05-27 2025-12-31 13F/A-1 AMPHENOL CORP CL A 032095101 18,185,947 64,649 0.36 2,457,649 9.59 0.1467
2026-02-13 2025-12-31 13F AMPHENOL CORP CL A 032095101 18,185,947 64,649 2,457,649 0.1467
2026-05-27 2025-09-30 13F/A-1 AMPHENOL CORP CL A 032095101 18,121,298 -1,456,462 -7.44 2,242,511 15.99 0.1358
2025-11-14 2025-09-30 13F AMPHENOL CORP CL A 032095101 18,121,298 -1,456,462 2,242,511 0.1358
2025-08-15 2025-06-30 13F AMPHENOL CORP CL A 032095101 19,577,760 -187,367 -0.95 1,933,304 49.13 0.1259
2025-05-15 2025-03-31 13F AMPHENOL CORP CL A 032095101 19,765,127 -116,703 -0.59 1,296,395 -6.11 0.0927
2025-05-15 2024-12-31 13F/A-1 AMPHENOL CORP CL A 032095101 19,881,830 -268,929 -1.33 1,380,793 5.16 0.0967
2025-02-14 2024-12-31 13F AMPHENOL CORP CL A 032095101 19,881,830 -268,929 1,380,793 0.0967
2025-05-14 2024-09-30 13F/A-2 AMPHENOL CORP CL A 032095101 20,150,759 294,819 1.48 1,313,024 -1.84 0.0952
2025-02-14 2024-09-30 13F/A-1 AMPHENOL CORP CL A 032095101 20,150,759 294,819 1,313,024 0.0952
2024-11-14 2024-09-30 13F AMPHENOL CORP CL A 032095101 20,150,759 294,819 1,313,024 0.0952
2025-05-14 2024-06-30 13F/A-2 AMPHENOL CORP CL A 032095101 19,855,940 10,117,129 103.88 1,337,695 19.08 0.1035
2024-10-17 2024-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 19,855,940 10,117,129 1,337,695 0.1035
2024-08-14 2024-06-30 13F AMPHENOL CORP CL A 032095101 19,855,940 10,117,129 1,337,695 0.1035
2024-10-17 2024-03-31 13F/A-2 AMPHENOL CORP CL A 032095101 9,738,811 -1,181,469 -10.82 1,123,372 3.77 0.0901
2024-08-16 2024-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 9,738,811 -1,181,469 1,123,372 0.0901
2024-05-15 2024-03-31 13F AMPHENOL CORP CL A 032095101 9,738,811 -1,181,469 1,123,372 0.0901
2024-08-16 2023-12-31 13F/A-1 AMPHENOL CORP CL A 032095101 10,920,280 537,348 5.18 1,082,528 24.13 0.0954
2024-02-13 2023-12-31 13F AMPHENOL CORP CL A 032095101 10,920,280 537,348 1,082,528 0.0954
2023-11-15 2023-09-30 13F AMPHENOL CORP CL A 032095101 10,382,932 -267,166 -2.51 872,063 -3.61 0.0887
2023-08-14 2023-06-30 13F AMPHENOL CORP CL A 032095101 10,650,098 124,514 1.18 904,726 5.18 0.0892
2023-05-15 2023-03-31 13F AMPHENOL CORP CL A 032095101 10,525,584 -285,891 -2.64 860,151 4.49 0.0922
2023-02-14 2022-12-31 13F AMPHENOL CORP CL A 032095101 10,811,475 3,310,939 44.14 823,186 63.90 0.0935
2022-11-14 2022-09-30 13F AMPHENOL CORP CL A 032095101 7,500,536 -354,935 -4.52 502,236 -0.69 0.0685
2022-10-27 2022-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 7,855,471 3,137,351 66.50 505,736 42.26 0.0656
2022-08-15 2022-06-30 13F AMPHENOL CORP CL A 032095101 7,855,471 3,137,351 505,736 0.0132
2022-10-27 2022-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 4,718,120 73,275 1.58 355,509 -12.49 0.0479
2022-05-13 2022-03-31 13F AMPHENOL CORP CL A 032095101 4,718,120 73,275 355,509 0.0479
2022-02-14 2021-12-31 13F AMPHENOL CORP CL A 032095101 4,644,845 247,690 5.63 406,239 26.16 0.0502
2021-11-15 2021-09-30 13F AMPHENOL CORP CL A 032095101 4,397,155 -54,099 -1.22 322,001 5.74 0.0434
2021-08-23 2021-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 4,451,254 295,016 7.10 304,509 11.06 0.0402
2021-08-16 2021-06-30 13F AMPHENOL CORP CL A 032095101 4,451,254 295,016 304,509 0.0083
2021-05-17 2021-03-31 13F AMPHENOL CORP CL A 032095101 4,156,238 1,777,630 74.73 274,188 -11.85 0.0403
2021-02-16 2020-12-31 13F AMPHENOL CORP CL A 032095101 2,378,608 386,463 19.40 311,050 44.21 0.0480
2020-11-13 2020-09-30 13F AMPHENOL CORP CL A 032095101 1,992,145 50,068 2.58 215,690 15.92 0.0417
2020-08-14 2020-06-30 13F AMPHENOL CORP CL A 032095101 1,942,077 -247,582 -11.31 186,070 16.60 0.0412
2020-05-26 2020-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 2,189,659 754,436 52.57 159,584 2.74 0.0434
2020-05-15 2020-03-31 13F AMPHENOL CORP CL A 032095101 2,189,659 754,436 159,584 12,259.3780
2020-02-14 2019-12-31 13F AMPHENOL CORP CL A 032095101 1,435,223 110,767 8.36 155,335 21.53 0.0361
2019-11-14 2019-09-30 13F AMPHENOL CORP CL A 032095101 1,324,456 399,940 43.26 127,811 44.10 0.0338
2019-08-14 2019-06-30 13F AMPHENOL CORP CL A 032095101 924,516 -155,150 -14.37 88,699 -13.01 0.0236
2019-05-15 2019-03-31 13F AMPHENOL CORP CL A 032095101 1,079,666 -95,335 -8.11 101,964 7.11 0.0289
2019-02-14 2018-12-31 13F AMPHENOL CORP CL A 032095101 1,175,001 -78,742 -6.28 95,198 -19.24 0.0285
2019-04-23 2018-09-30 13F/A-2 AMPHENOL CORP CL A 032095101 1,253,743 152,072 13.80 117,878 22.78 0.0295
2018-11-20 2018-09-30 13F/A-1 AMPHENOL CORP CL A 032095101 1,253,743 0 117,878 0.0295
2018-11-14 2018-09-30 13F AMPHENOL CORP CL A 032095101 1,253,743 152,072 117,878
2019-04-23 2018-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 1,101,671 -182,926 -14.24 96,010 -13.23 0.0259
2018-08-14 2018-06-30 13F AMPHENOL CORP CL A 032095101 1,101,671 -182,926 96,010
2019-04-23 2018-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 1,284,597 79,474 6.59 110,643 4.57 0.0307
2018-05-14 2018-03-31 13F AMPHENOL CORP CL A 032095101 1,284,597 79,474 110,643
2019-04-23 2017-12-31 13F/A-1 AMPHENOL CORP CL A 032095101 1,205,123 185,163 18.15 105,810 22.57 0.0290
2018-02-14 2017-12-31 13F AMPHENOL CORP CL A 032095101 1,205,123 185,163 105,810
2017-11-14 2017-09-30 13F AMPHENOL CORP CL A 032095101 1,019,960 -337,777 -24.88 86,329 -13.87 0.0259
2017-08-11 2017-06-30 13F AMPHENOL CORP CL A 032095101 1,357,737 346,436 34.26 100,226 39.25 0.0303
2017-05-22 2017-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 1,011,301 -305,598 -23.21 71,976 -18.67 0.0221
2017-05-12 2017-03-31 13F AMPHENOL CORP CL A 032095101 1,011,301 71,976
2017-02-22 2016-12-31 13F/A-1 AMPHENOL CORP CL A 032095101 1,316,899 511,842 63.58 88,495 69.33 0.0290
2017-02-13 2016-12-31 13F AMPHENOL CORP CL A 032095101 1,316,899 88,495
2016-11-10 2016-09-30 13F AMPHENOL CORP CL A 032095101 805,057 -47,268 -5.55 52,263 6.96 0.0178
2016-08-12 2016-06-30 13F AMPHENOL CORP CL A 032095101 852,325 -324,063 -27.55 48,863 -28.16 0.0176
2016-05-12 2016-03-31 13F AMPHENOL CORP CL A 032095101 1,176,388 166,064 16.44 68,018 28.90 0.0262
2016-02-09 2015-12-31 13F AMPHENOL CORP CL A 032095101 1,010,324 41,652 4.30 52,769 6.90 0.0191
2016-02-08 2015-09-30 13F/A-1 AMPHENOL CORP CL A 032095101 968,672 105,626 12.24 49,363 -1.33 0.0182
2015-11-09 2015-09-30 13F AMPHENOL CORP CL A 032095101 968,672 49,363
2015-08-12 2015-06-30 13F AMPHENOL CORP CL A 032095101 863,046 -92,137 -9.65 50,030 -11.12 0.0173
2015-05-14 2015-03-31 13F AMPHENOL CORP CL A 032095101 955,183 -35,702 -3.60 56,287 5.56 0.0207
2015-02-13 2014-12-31 13F AMPHENOL CORP CL A 032095101 990,885 483,360 95.24 53,321 5.21 0.0195
2014-12-16 2014-09-30 13F/A-1 AMPHENOL CORP CL A 032095101 507,525 55,838 12.36 50,680 16.46 0.0195
2014-11-14 2014-09-30 13F AMPHENOL CORP CL A 032095101 507,525 50,680
2014-08-12 2014-06-30 13F AMPHENOL CORP CL A 032095101 451,687 15,365 3.52 43,516 8.82 0.0744
2014-05-13 2014-03-31 13F AMPHENOL CORP CL A 032095101 436,322 7,179 1.67 39,989 4.49 0.0167
2014-02-13 2013-12-31 13F AMPHENOL CORP CL A 032095101 429,143 -26,303 -5.78 38,272 8.60 0.0163
2013-11-13 2013-09-30 13F AMPHENOL CORPORATION COM 032095101 455,446 -5,321 -1.15 35,242 -1.86 0.0167
2013-08-08 2013-06-30 13F AMPHENOL CORPORATION COM 032095101 460,767 460,767 35,911 0.0181
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.