Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionAllstate Corp
Latest Disclosed Ownership88,151 shares
Latest Disclosed Value $ 11,137,879
Allstate Corp reports 4.44% decrease in ownership of APH / Amphenol Corporation

On May 11, 2026 - Allstate Corp filed a 13F-HR form disclosing ownership of 88,151 shares of Amphenol Corporation (US:APH) valued at $11,137,879 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 92,247 shares of Amphenol Corporation. This represents a change in shares of -4.44% during the quarter. The current value of the position is $13,012,851 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)
2026-05-11 2026-03-31 13F AMPHENOL CL A ORD Equity 032095101 88,151 -4,096 -4.44 11,138 -10.66 0.1102
2026-02-09 2025-12-31 13F AMPHENOL CL A ORD Equity 032095101 92,247 47,809 107.59 12,466 126.70 0.1703
2025-10-29 2025-09-30 13F AMPHENOL CL A ORD Equity 032095101 44,438 41,770 1,565.59 5,499 1,990.87 0.1255
2025-08-05 2025-06-30 13F AMPHENOL CL A ORD Equity 032095101 2,668 -11,777 -81.53 263 -72.23 0.0190
2025-05-14 2025-03-31 13F AMPHENOL CL A ORD Equity 032095101 14,445 -21,072 -59.33 947 -61.60 0.0278
2025-02-12 2024-12-31 13F AMPHENOL CL A ORD Equity 032095101 35,517 35,517 2,467 0.0726
2024-11-14 2024-09-30 13F AMPHENOL EQU 032095101 0 -7,149 -100.00 0 -100.00
2024-08-13 2024-06-30 13F AMPHENOL EQU 032095101 7,149 3,559 99.14 482 16.18 0.0391
2024-05-10 2024-03-31 13F AMPHENOL EQU 032095101 3,590 0 0.00 414 16.62 0.0294
2024-02-09 2023-12-31 13F AMPHENOL EQU 032095101 3,590 -178 -4.72 356 12.34 0.0246
2023-11-13 2023-09-30 13F AMPHENOL EQU 032095101 3,768 0 0.00 316 -1.25 0.0185
2023-08-14 2023-06-30 13F AMPHENOL EQU 032095101 3,768 0 0.00 320 4.23 0.0204
2023-05-10 2023-03-31 13F AMPHENOL EQU 032095101 3,768 -35,769 -90.47 308 -89.80 0.0229
2023-02-14 2022-12-31 13F AMPHENOL EQU 032095101 39,537 322 0.82 3,010 14.62 0.0915
2022-11-14 2022-09-30 13F AMPHENOL EQU 032095101 39,215 0 0.00 2,626 4.00 0.0756
2022-08-15 2022-06-30 13F AMPHENOL EQU 032095101 39,215 -135 -0.34 2,525 -14.84 0.0777
2022-05-16 2022-03-31 13F AMPHENOL EQU 032095101 39,350 -9,525 -19.49 2,965 -30.64 0.0792
2022-02-15 2021-12-31 13F AMPHENOL EQU 032095101 48,875 9,660 24.63 4,275 48.85 0.0817
2021-11-15 2021-09-30 13F AMPHENOL EQU 032095101 39,215 -1,872 -4.56 2,872 2.17 0.1188
2021-08-16 2021-06-30 13F AMPHENOL EQU 032095101 41,087 -1,664 -3.89 2,811 -0.32 0.0942
2021-05-14 2021-03-31 13F AMPHENOL CORP EQU 032095101 42,751 22,009 106.11 2,820 3.98 0.0885
2021-02-12 2020-12-31 13F AMPHENOL CORP EQU 032095101 20,742 988 5.00 2,712 26.79 0.0842
2020-11-13 2020-09-30 13F AMPHENOL CORP EQU 032095101 19,754 -463 -2.29 2,139 10.43 0.0694
2020-08-13 2020-06-30 13F AMPHENOL CORP EQU 032095101 20,217 -6,956 -25.60 1,937 -2.17 0.0666
2020-05-15 2020-03-31 13F AMPHENOL CORP COMMON 032095101 27,173 -16,312 -37.51 1,980 -57.93 0.0775
2020-02-14 2019-12-31 13F AMPHENOL CORP COMMON 032095101 43,485 531 1.24 4,706 13.53 0.0854
2019-11-14 2019-09-30 13F AMPHENOL CORP COMMON 032095101 42,954 -5,000 -10.43 4,145 -9.91 0.0713
2019-08-14 2019-06-30 13F AMPHENOL CORP COMMON 032095101 47,954 5,000 11.64 4,601 13.41 0.0822
2019-05-20 2019-03-31 13F AMPHENOL CORP COMMON 032095101 42,954 -279 -0.65 4,057 15.82 0.1094
2019-02-13 2018-12-31 13F AMPHENOL CORP COMMON 032095101 43,233 43,233 3,503 0.1151
2017-08-14 2017-06-30 13F AMPHENOL CORP COMMON 032095101 0 -59,513 -100.00 0 -100.00
2017-05-15 2017-03-31 13F AMPHENOL CORP COMMON 032095101 59,513 24,607 70.50 4,236 80.56 0.2567
2017-02-14 2016-12-31 13F AMPHENOL CORP COMMON 032095101 34,906 -59,059 -62.85 2,346 -61.54 0.1403
2016-11-14 2016-09-30 13F AMPHENOL CORP COMMON 032095101 93,965 -16,655 -15.06 6,100 -3.82 0.4302
2016-08-11 2016-06-30 13F AMPHENOL CORP COMMON 032095101 110,620 110,620 0.00 6,342 0.4149
2016-02-16 2015-12-31 13F AMPHENOL CORP COMMON 032095101 0 -52,572 -100.00 0 -100.00
2015-11-16 2015-09-30 13F AMPHENOL CORP COMMON 032095101 52,572 14,151 36.83 2,679 20.30 0.2759
2015-08-13 2015-06-30 13F AMPHENOL CORP COMMON 032095101 38,421 -39,477 -50.68 2,227 -51.49 0.1985
2015-05-15 2015-03-31 13F AMPHENOL CORP COMMON 032095101 77,898 77,898 4,591 0.3843
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.