Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionNorthwestern Mutual Wealth Management Co
Latest Disclosed Ownership111,287 shares
Latest Disclosed Value $ 14,061,174
Northwestern Mutual Wealth Management Co reports 10.49% increase in ownership of APH / Amphenol Corporation

On May 7, 2026 - Northwestern Mutual Wealth Management Co filed a 13F-HR form disclosing ownership of 111,287 shares of Amphenol Corporation (US:APH) valued at $14,061,112 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on February 10, 2026 disclosing 100,719 shares of Amphenol Corporation. This represents a change in shares of 10.49% during the quarter. The current value of the position is $15,447,748 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 111,287 10,568 10.49 14,061 3.31 0.0087
2026-02-10 2025-12-31 13F/A-1 AMPHENOL CORP CL A 032095101 100,719 2,598 2.65 13,611 12.10 0.0086
2026-02-05 2025-12-31 13F AMPHENOL CORP CL A 032095101 34,100 -64,021 4,050 0.0026
2025-11-14 2025-09-30 13F AMPHENOL CORP CL A 032095101 98,121 1,012 1.04 12,142 26.62 0.0081
2025-08-13 2025-06-30 13F AMPHENOL CORP CL A 032095101 97,109 -12,252 -11.20 9,590 33.68 0.0070
2025-05-14 2025-03-31 13F AMPHENOL CORP CL A 032095101 109,361 28,428 35.13 7,173 27.63 0.0059
2025-02-11 2024-12-31 13F AMPHENOL CORP CL A 032095101 80,933 820 1.02 5,621 7.66 0.0047
2024-11-12 2024-09-30 13F AMPHENOL CORP CL A 032095101 80,113 4,643 6.15 5,220 2.68 0.0046
2024-08-16 2024-06-30 13F AMPHENOL CORP CL A 032095101 75,470 64,703 600.94 5,084 309.67 0.0050
2024-05-15 2024-03-31 13F AMPHENOL CORP CL A 032095101 10,767 977 9.98 1,242 27.94 0.0013
2024-02-13 2023-12-31 13F AMPHENOL CORP CL A 032095101 9,790 -144 -1.45 970 16.31 0.0011
2023-11-14 2023-09-30 13F AMPHENOL CORP CL A 032095101 9,934 -10,263 -50.81 834 -51.37 0.0011
2023-08-14 2023-06-30 13F AMPHENOL CORP CL A 032095101 20,197 6,761 50.32 1,716 56.34 0.0022
2023-05-15 2023-03-31 13F AMPHENOL CORP CL A 032095101 13,436 -1,271 -8.64 1,098 -1.97 0.0015
2023-02-21 2022-12-31 13F AMPHENOL CORP CL A 032095101 14,707 1,957 15.35 1,120 31.03 0.0017
2022-11-14 2022-09-30 13F AMPHENOL CORP CL A 032095101 12,750 3,801 42.47 854 48.26 0.0015
2022-08-04 2022-06-30 13F AMPHENOL CORP CL A 032095101 8,949 46 0.52 576 -14.16 0.0010
2022-05-09 2022-03-31 13F AMPHENOL CORP CL A 032095101 8,903 665 8.07 671 -6.81 0.0011
2022-02-03 2021-12-31 13F AMPHENOL CORP CL A 032095101 8,238 799 10.74 720 32.35 0.0012
2021-11-15 2021-09-30 13F AMPHENOL CORP CL A 032095101 7,439 1,228 19.77 544 28.00 0.0010
2021-08-13 2021-06-30 13F AMPHENOL CORP CL A 032095101 6,211 -469 -7.02 425 -3.63 0.0008
2021-05-14 2021-03-31 13F AMPHENOL CORP CL A 032095101 6,680 3,994 148.70 441 25.28 0.0009
2021-02-12 2020-12-31 13F AMPHENOL CORP CL A 032095101 2,686 55 2.09 352 23.51 0.0008
2020-11-13 2020-09-30 13F AMPHENOL CORP CL A 032095101 2,631 -18 -0.68 285 12.20 0.0008
2020-08-14 2020-06-30 13F AMPHENOL CORP CL A 032095101 2,649 -495 -15.74 254 10.92 0.0008
2020-05-08 2020-03-31 13F AMPHENOL CORP CL A 032095101 3,144 403 14.70 229 -22.90 0.0009
2020-02-13 2019-12-31 13F AMPHENOL CORP CL A 032095101 2,741 458 20.06 297 35.00 0.0010
2019-11-12 2019-09-30 13F AMPHENOL CORP CL A 032095101 2,283 1,089 91.21 220 92.98 0.0008
2019-08-12 2019-06-30 13F AMPHENOL CORP CL A 032095101 1,194 67 5.94 114 6.54 0.0005
2019-05-10 2019-03-31 13F AMPHENOL CORP CL A 032095101 1,127 80 7.64 107 25.88 0.0005
2019-02-12 2018-12-31 13F AMPHENOL CORP CL A 032095101 1,047 44 4.39 85 -9.57 0.0004
2018-11-01 2018-09-30 13F AMPHENOL CORP CL A 032095101 1,003 -155 -13.39 94 -6.93 0.0005
2018-08-10 2018-06-30 13F AMPHENOL CORP CL A 032095101 1,158 41 3.67 101 5.21 0.0006
2018-05-14 2018-03-31 13F AMPHENOL CORP CL A 032095101 1,117 -296 -20.95 96 -22.58 0.0006
2018-01-31 2017-12-31 13F AMPHENOL CORP CL A 032095101 1,413 358 33.93 124 39.33 0.0008
2017-11-07 2017-09-30 13F AMPHENOL CORP CL A 032095101 1,055 -69 -6.14 89 7.23 0.0006
2017-08-10 2017-06-30 13F AMPHENOL CORP CL A 032095101 1,124 198 21.38 83 25.76 0.0007
2017-05-09 2017-03-31 13F AMPHENOL CORP CL A 032095101 926 -828 -47.21 66 -44.07 0.0006
2017-02-15 2016-12-31 13F AMPHENOL CORP CL A 032095101 1,754 248 16.47 118 20.41 0.0013
2016-11-14 2016-09-30 13F AMPHENOL CORP CL A 032095101 1,506 -212 -12.34 98 -1.01 0.0015
2016-08-29 2016-06-30 13F AMPHENOL CORP CL A 032095101 1,718 225 15.07 99 15.12 0.0014
2016-05-16 2016-03-31 13F AMPHENOL CORP CL A 032095101 1,493 609 68.89 86 86.96 0.0014
2016-02-16 2015-12-31 13F AMPHENOL CORP CL A 032095101 884 264 42.58 46 43.75 0.0009
2015-11-16 2015-09-30 13F AMPHENOL CORP CL A 032095101 620 -290 -31.87 32 -39.62 0.0008
2015-09-30 2015-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 910 357 64.56 53 60.61 0.0014
2015-08-14 2015-06-30 13F AMPHENOL CORP CL A 032095101 553 33
2015-05-15 2015-03-31 13F AMPHENOL CORP CL A 032095101 553 553 0.00 33 0.0009
2015-02-13 2014-12-31 13F AMPHENOL CORP CL A 032095101 0 -70 -100.00 0 -100.00
2014-11-14 2014-09-30 13F AMPHENOL CORP CL A 032095101 70 25 55.56 7 75.00 0.0002
2014-02-14 2013-12-31 13F AMPHENOL CORP CL A 032095101 45 45 -99.98 4 -99.97 0.0002
2013-11-14 2013-09-30 13F AMPHENOL CORP CL A 032095101 0 -183,944 -100.00 0 -100.00
2013-08-14 2013-06-30 13F AMPHENOL CORP CL A 032095101 183,944 183,944 14,337 0.1576
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.