Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership264,236 shares
Latest Disclosed Value $ 33,390,506
Advisor Group Holdings, Inc. ownership in APH / Amphenol Corporation

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 264,236 shares of Amphenol Corporation (US:APH) valued at $33,386,219 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 246,074 shares of Amphenol Corporation. This represents a change in shares of 7.38% during the quarter. The current value of the position is $39,006,518 USD.

Advisor Group Holdings, Inc. has a history of taking positions in derivatives of the underlying security (APH) in the form of stock options. The firm currently holds call options representing 2 of underlying shares valued at $9,820 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

APH / Amphenol Corporation Historical Put/Call Ratio
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 264,236 18,162 7.38 33,391 0.40 0.0284
2026-02-17 2025-12-31 13F AMPHENOL CORP CL A 032095101 246,074 -1,008 -0.41 33,258 12.59 0.0486
2025-11-14 2025-09-30 13F AMPHENOL CORP CL A 032095101 247,082 143,366 138.23 29,538 188.37 0.0413
2025-09-04 2025-06-30 13F/A-1 MPHENOL CORP CL A 032095101 103,716 9,879 10.53 10,244 66.42 0.0182
2025-08-13 2025-06-30 13F MPHENOL CORP CL A 032095101 97,934 4,097 7,959 0.0092
2025-05-12 2025-03-31 13F AMPHENOL CORP CL A 032095101 93,837 -9,196 -8.93 6,155 10.90 0.0137
2025-06-06 2024-12-31 13F/A-1 AMPHENOL CORP CL A 032095101 103,033 -36,865 -26.35 5,550 -39.12 0.0125
2025-02-07 2024-12-31 13F AMPHENOL CORP CL A 032095101 106,281 -33,617 5,512 0.0141
2024-11-13 2024-09-30 13F AMPHENOL CORP CL A 032095101 139,898 48,389 52.88 9,117 47.88 0.0206
2024-08-13 2024-06-30 13F AMPHENOL CORP CL A 032095101 91,509 -81 -0.09 6,165 -41.65 0.0146
2024-05-10 2024-03-31 13F AMPHENOL CORP CL A 032095101 91,590 -84,410 -47.96 10,565 -39.47 0.0236
2024-02-12 2023-12-31 13F AMPHENOL CORP CL A 032095101 176,000 -20,151 -10.27 17,454 5.91 0.0305
2023-11-13 2023-09-30 13F AMPHENOL CORP CL A 032095101 196,151 32,721 20.02 16,481 18.66 0.0244
2023-08-21 2023-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 163,430 -40,984 -20.05 13,889 -16.78 0.0249
2023-08-10 2023-06-30 13F AMPHENOL CORP CL A 032095101 180,807 -23,607 13,871 0.0038
2023-05-12 2023-03-31 13F AMPHENOL CORP CL A 032095101 204,414 6,663 3.37 16,689 10.80 0.0314
2023-02-10 2022-12-31 13F AMPHENOL CORP CL A 032095101 197,751 4,967 2.58 15,062 16.64 0.0305
2022-11-14 2022-09-30 13F AMPHENOL CORP CL A 032095101 192,784 4,856 2.58 12,912 6.75 0.0295
2022-08-10 2022-06-30 13F AMPHENOL CORP CL A 032095101 187,928 -639 -0.34 12,096 -11.73 0.0267
2022-05-04 2022-03-31 13F AMPHENOL CORP CL A 032095101 188,567 -12,690 -6.31 13,704 -22.12 0.0266
2022-02-03 2021-12-31 13F AMPHENOL CORP CL A 032095101 201,257 12,529 6.64 17,596 27.18 0.0333
2021-11-05 2021-09-30 13F AMPHENOL CORP CL A 032095101 188,728 9,893 5.53 13,835 13.01 0.0288
2021-08-02 2021-06-30 13F AMPHENOL CORP CL A 032095101 178,835 6,153 3.56 12,242 7.39 0.0265
2021-05-13 2021-03-31 13F AMPHENOL CORP CL A 032095101 172,682 93,170 117.18 11,400 9.65 0.0274
2021-02-10 2020-12-31 13F AMPHENOL CORP CL A 032095101 79,512 1,993 2.57 10,397 24.22 0.0278
2020-11-12 2020-09-30 13F AMPHENOL CORP CL A 032095101 77,519 11,866 18.07 8,370 33.09 0.0250
2020-08-14 2020-06-30 13F AMPHENOL CORP CL A 032095101 65,653 7,163 12.25 6,289 47.39 0.0211
2020-05-18 2020-03-31 13F AMPHENOL CORP CL A 032095101 58,490 58,490 4,267 0.0175
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F AMPHENOL CALL Call 2 100.00 10 50.00 n/a n/a n/a
2026-02-17 2025-12-31 13F AMPHENOL CORP CALL Call 1 0.00 6 100.00 n/a n/a n/a
2025-11-14 2025-09-30 13F AMPHENOL CORP CALL Call 1 3 n/a n/a n/a
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.