Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionMagnetar Financial LLC
Latest Disclosed Ownership3,355 shares
Latest Disclosed Value $ 399,749
Magnetar Financial LLC ownership in APH / Amphenol Corporation

On May 13, 2026 - Magnetar Financial LLC filed a 13F-HR form disclosing ownership of 3,355 shares of Amphenol Corporation (US:APH) valued at $423,904 USD as of March 31, 2026. The entity filed a previous 13F-HR on November 13, 2025 disclosing 0 shares of Amphenol Corporation. The current value of the position is $465,708 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)
2026-05-13 2026-03-31 13F AMPHENOL CL A 032095101 3,355 3,355 400 0.0041
2025-11-13 2025-09-30 13F AMPHENOL CORP CL A 032095101 0 -9,037 -100.00 0 -100.00
2025-08-12 2025-06-30 13F AMPHENOL CORP CL A 032095101 9,037 9,037 892 0.0043
2025-05-15 2025-03-31 13F AMPHENOL CORP CL A 032095101 0 -14,191 -100.00 0 -100.00
2025-02-11 2024-12-31 13F AMPHENOL CORP CL A 032095101 14,191 -87,663 -86.07 986 -85.16 0.0226
2024-11-13 2024-09-30 13F AMPHENOL CORP CL A 032095101 101,854 38,691 61.26 6,637 55.96 0.1437
2024-08-14 2024-06-30 13F AMPHENOL CORP CL A 032095101 63,163 63,163 4,255 0.0887
2024-02-13 2023-12-31 13F AMPHENOL CORP CL A 032095101 0 -41,600 -100.00 0 -100.00
2023-11-14 2023-09-30 13F AMPHENOL CORP CL A 032095101 41,600 41,600 3,494 0.0892
2023-08-11 2023-06-30 13F AMPHENOL CORP CL A 032095101 0 -11,959 -100.00 0 -100.00
2023-05-15 2023-03-31 13F AMPHENOL CORP CL A 032095101 11,959 -24,609 -67.30 977 48,750.00 0.0191
2023-02-14 2022-12-31 13F AMPHENOL CORP CL A 032095101 36,568 21,170 137.49 3 -99.81 0.0471
2022-11-14 2022-09-30 13F AMPHENOL CORP CL A 032095101 15,398 -9,560 -38.30 1,031 -35.84 0.0143
2022-08-15 2022-06-30 13F AMPHENOL CORP CL A 032095101 24,958 -28,290 -53.13 1,607 -59.95 0.0166
2022-05-16 2022-03-31 13F AMPHENOL CORP CL A 032095101 53,248 53,248 4,012 0.0428
2022-01-14 2021-09-30 13F/A-1 AMPHENOL CORP CL A 032095101 0 -22,444 -100.00 0 -100.00
2021-11-12 2021-09-30 13F AMPHENOL CORP CL A 032095101 0 -22,444 0
2021-08-06 2021-06-30 13F AMPHENOL CORP CL A 032095101 22,444 -23,471 -51.12 1,535 -49.32 0.0145
2021-05-14 2021-03-31 13F AMPHENOL CORP CL A 032095101 45,915 45,915 3,029 0.0291
2021-02-12 2020-12-31 13F AMPHENOL CORP CL A 032095101 0 -4,105 -100.00 0 -100.00
2020-11-16 2020-09-30 13F AMPHENOL CORP CL A 032095101 4,105 4,105 444 0.0078
2020-08-14 2020-06-30 13F AMPHENOL CORP CL A 032095101 0 -4,260 -100.00 0 -100.00
2020-05-15 2020-03-31 13F AMPHENOL CORP CL A 032095101 4,260 4,260 310 0.0075
2019-02-14 2018-12-31 13F AMPHENOL CORP CL A 032095101 0 -3,802 -100.00 0 -100.00
2019-02-14 2018-09-30 13F/A-1 AMPHENOL CORP CL A 032095101 3,802 -5,083 -57.21 357 -53.88 0.0064
2018-11-14 2018-09-30 13F AMPHENOL CORP CL A 032095101 3,802 -5,083 357
2018-08-14 2018-06-30 13F AMPHENOL CORP CL A 032095101 8,885 -30,900 -77.67 774 -77.41 0.0150
2018-05-15 2018-03-31 13F AMPHENOL CORP CL A 032095101 39,785 32,647 457.37 3,427 446.57 0.0863
2018-02-14 2017-12-31 13F AMPHENOL CORP CL A 032095101 7,138 7,138 627 0.0154
2017-11-14 2017-09-30 13F AMPHENOL CORP CL A 032095101 0 -2,878 -100.00 0 -100.00
2017-08-14 2017-06-30 13F AMPHENOL CORP CL A 032095101 2,878 -1,306 -31.21 212 -28.86 0.0038
2017-05-15 2017-03-31 13F AMPHENOL CORP CL A 032095101 4,184 -5,076 -54.82 298 -52.09 0.0047
2017-02-14 2016-12-31 13F AMPHENOL CORP CL A 032095101 9,260 -7,301 -44.09 622 -42.14 0.0085
2016-11-14 2016-09-30 13F AMPHENOL CORP CL A 032095101 16,561 4,597 38.42 1,075 56.71 0.0167
2016-08-15 2016-06-30 13F * AMPHENOL CORP CL A 032095101 11,964 5,909 97.59 686 96.00 0.0129
2016-05-16 2016-03-31 13F * AMPHENOL CORP CL A 032095101 6,055 6,055 350 0.0070
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.