Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionRhumbline Advisers
Latest Disclosed Ownership2,318,236 shares
Latest Disclosed Value $ 292,908,991
Rhumbline Advisers reports 0.96% decrease in ownership of APH / Amphenol Corporation

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 2,318,236 shares of Amphenol Corporation (US:APH) valued at $292,909,119 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 2,340,644 shares of Amphenol Corporation. This represents a change in shares of -0.96% during the quarter. The current value of the position is $321,794,339 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)
2026-05-12 2026-03-31 13F AMPHENOL CORP NEW CL A COM 032095101 2,318,236 -22,408 -0.96 292,909 -7.40 0.2506
2026-02-13 2025-12-31 13F AMPHENOL CORP NEW CL A COM 032095101 2,340,644 -36,524 -1.54 316,315 7.53 0.2557
2025-11-06 2025-09-30 13F AMPHENOL CORP NEW CL A COM 032095101 2,377,168 -67,482 -2.76 294,174 21.86 0.2363
2025-08-12 2025-06-30 13F AMPHENOL CORP NEW CL A COM 032095101 2,444,650 30,412 1.26 241,409 52.45 0.2067
2025-05-29 2025-03-31 13F/A-1 AMPHENOL CORP NEW CL A COM 032095101 2,414,238 55,119 2.34 158,350 -3.35 0.1481
2025-04-08 2025-03-31 13F AMPHENOL CORP NEW CL A COM 032095101 2,414,238 55,119 158,350 0.1481
2025-05-29 2024-12-31 13F/A-1 AMPHENOL CORP NEW CL A COM 032095101 2,359,119 -65,238 -2.69 163,841 3.72 0.1466
2025-01-30 2024-12-31 13F AMPHENOL CORP NEW CL A COM 032095101 2,359,119 -65,238 163,841 0.1466
2024-11-12 2024-09-30 13F AMPHENOL CORP NEW CL A COM 032095101 2,424,357 -57,376 -2.31 157,971 -5.52 0.1425
2024-08-01 2024-06-30 13F AMPHENOL CORP NEW CL A COM 032095101 2,481,733 1,172,014 89.49 167,194 10.67 0.1571
2024-05-09 2024-03-31 13F AMPHENOL CORP NEW CL A COM 032095101 1,309,719 11,121 0.86 151,076 17.36 0.1451
2024-02-08 2023-12-31 13F AMPHENOL CORP NEW CL A COM 032095101 1,298,598 -16,867 -1.28 128,730 16.51 0.1349
2023-11-09 2023-09-30 13F AMPHENOL CORP NEW CL A COM 032095101 1,315,465 5,961 0.46 110,486 -0.68 0.1282
2023-08-08 2023-06-30 13F AMPHENOL CORP NEW CL A COM 032095101 1,309,504 -22,298 -1.67 111,242 102,901.85 0.1246
2023-05-11 2023-03-31 13F AMPHENOL CORP NEW CL A COM 032095101 1,331,802 65,153 5.14 109 -99.89 0.1343
2023-02-14 2022-12-31 13F AMPHENOL CORP NEW CL A COM 032095101 1,266,649 41,835 3.42 96,443 17.59 0.1296
2022-11-10 2022-09-30 13F AMPHENOL CORP NEW CL A COM 032095101 1,224,814 86,813 7.63 82,014 11.94 0.1222
2022-08-11 2022-06-30 13F AMPHENOL CORP NEW CL A COM 032095101 1,138,001 91,497 8.74 73,265 -7.09 0.1069
2022-05-12 2022-03-31 13F AMPHENOL CORP NEW CL A COM 032095101 1,046,504 -129,727 -11.03 78,854 -23.35 0.1015
2022-02-10 2021-12-31 13F AMPHENOL CORP NEW CL A COM 032095101 1,176,231 -8,273 -0.70 102,873 18.60 0.1261
2021-11-12 2021-09-30 13F AMPHENOL CORP NEW CL A COM 032095101 1,184,504 8,056 0.68 86,741 7.78 0.1174
2021-08-05 2021-06-30 13F AMPHENOL CORP NEW CL A COM 032095101 1,176,448 -40,148 -3.30 80,481 0.28 0.1056
2021-05-06 2021-03-31 13F AMPHENOL CORP NEW CL A COM 032095101 1,216,596 580,433 91.24 80,259 -3.52 0.1090
2021-02-10 2020-12-31 13F AMPHENOL CORP NEW CL A COM 032095101 636,163 -2,175 -0.34 83,191 20.37 0.1148
2020-11-12 2020-09-30 13F AMPHENOL CORP NEW CL A COM 032095101 638,338 -7,825 -1.21 69,113 11.64 0.1083
2020-08-13 2020-06-30 13F AMPHENOL CORP NEW CL A COM 032095101 646,163 2,388 0.37 61,909 31.95 0.1034
2020-05-06 2020-03-31 13F AMPHENOL CORP NEW CL A COM 032095101 643,775 9,499 1.50 46,918 -31.65 0.0983
2020-02-05 2019-12-31 13F AMPHENOL CORP NEW CL A COM 032095101 634,276 21,000 3.42 68,648 16.00 0.1148
2019-10-23 2019-09-30 13F AMPHENOL CORP NEW CL A COM 032095101 613,276 14,975 2.50 59,181 3.10 0.1081
2019-08-14 2019-06-30 13F AMPHENOL CORP NEW CL A COM 032095101 598,301 -7,907 -1.30 57,401 0.26 0.1078
2019-05-01 2019-03-31 13F AMPHENOL CORP NEW CL A COM 032095101 606,208 -31,958 -5.01 57,250 10.73 0.1109
2019-01-31 2018-12-31 13F AMPHENOL CORP NEW CL A COM 032095101 638,166 -26,793 -4.03 51,704 -17.30 0.1125
2018-11-07 2018-09-30 13F AMPHENOL CORP NEW CL A COM 032095101 664,959 -3,276 -0.49 62,519 7.35 0.1207
2018-08-06 2018-06-30 13F AMPHENOL CORP NEW CL A COM 032095101 668,235 -1,585 -0.24 58,237 0.94 0.1175
2018-05-02 2018-03-31 13F AMPHENOL CORP NEW CL A COM 032095101 669,820 -9,872 -1.45 57,692 -3.33 0.1205
2018-02-09 2017-12-31 13F AMPHENOL CORP NEW CL A COM 032095101 679,692 -5,457 -0.80 59,677 2.91 0.1212
2017-11-06 2017-09-30 13F AMPHENOL CORP NEW CL A COM 032095101 685,149 -6,591 -0.95 57,991 13.57 0.1261
2017-08-02 2017-06-30 13F AMPHENOL CORP NEW CL A COM 032095101 691,740 12,678 1.87 51,064 5.66 0.1166
2017-05-02 2017-03-31 13F AMPHENOL CORP NEW CL A COM 032095101 679,062 40,417 6.33 48,329 12.61 0.1129
2017-01-27 2016-12-31 13F AMPHENOL CORP NEW CL A COM 032095101 638,645 50,971 8.67 42,917 12.49 0.1088
2016-11-08 2016-09-30 13F AMPHENOL CORP NEW CL A COM 032095101 587,674 26,871 4.79 38,152 18.67 0.1051
2016-08-11 2016-06-30 13F AMPHENOL CORP NEW CL A COM 032095101 560,803 20,086 3.71 32,151 2.84 0.0953
2016-05-02 2016-03-31 13F AMPHENOL CORP CL A COMMON STOC COM 032095101 540,717 11,714 2.21 31,264 13.15 0.0970
2016-02-03 2015-12-31 13F AMPHENOL CORP CL A COMMON STOC COM 032095101 529,003 -365 -0.07 27,630 2.42 0.0889
2015-11-04 2015-09-30 13F AMPHENOL CORP CL A COMMON STOC COM 032095101 529,368 1,961 0.37 26,977 -11.76 0.0918
2015-08-04 2015-06-30 13F AMPHENOL CORP CL A COMMON STOC COM 032095101 527,407 54,327 11.48 30,574 9.67 0.0974
2015-05-12 2015-03-31 13F AMPHENOL CORP CL A COMMON STOC COM 032095101 473,080 -6,594 -1.37 27,879 8.01 0.0804
2015-02-06 2014-12-31 13F AMPHENOL CORP CL A COMMON STOC COM 032095101 479,674 235,977 96.83 25,811 6.06 0.0750
2014-11-12 2014-09-30 13F AMPHENOL CORP CL A COMMON STOC COM 032095101 243,697 -15,239 -5.89 24,336 -2.45 0.0731
2014-08-06 2014-06-30 13F AMPHENOL CORP CL A COMMON STOC COM 032095101 258,936 -10,979 -4.07 24,946 0.84 0.0732
2014-05-06 2014-03-31 13F AMPHENOL CORP CL A COMMON STOC COM 032095101 269,915 -12,171 -4.31 24,738 -1.66 0.0734
2014-02-03 2013-12-31 13F AMPHENOL CORP CL A COMMON STOC COM 032095101 282,086 -19,360 -6.42 25,156 7.85 0.0742
2013-11-05 2013-09-30 13F AMPHENOL CORP CL A COMMON STOC COM 032095101 301,446 -779 -0.26 23,326 -0.97 0.0723
2013-08-07 2013-06-30 13F AMPHENOL CORP CL A COMMON STOC COM 032095101 302,225 302,225 23,555 0.0757
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.