Amphenol Corporation
US ˙ NYSE ˙ US0320951017

SecurityAPH / Amphenol Corporation
InstitutionBrown Advisory Inc
Latest Disclosed Ownership367,934 shares
Latest Disclosed Value $ 46,488,408
Brown Advisory Inc reports 0.70% increase in ownership of APH / Amphenol Corporation

On May 15, 2026 - Brown Advisory Inc filed a 13F-HR form disclosing ownership of 367,934 shares of Amphenol Corporation (US:APH) valued at $46,488,461 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 365,368 shares of Amphenol Corporation. This represents a change in shares of 0.70% during the quarter. The current value of the position is $54,314,417 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.

Upgrade to unlock premium data and export to Excel .

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 367,934 2,566 0.70 46,488 -5.85 0.0764
2026-02-13 2025-12-31 13F AMPHENOL CORP CL A 032095101 365,368 7,029 1.96 49,376 11.35 0.0689
2025-11-14 2025-09-30 13F AMPHENOL CORP CL A 032095101 358,339 -4,035 -1.11 44,344 23.92 0.0577
2025-08-13 2025-06-30 13F AMPHENOL CORP CL A 032095101 362,374 -5,573 -1.51 35,784 48.28 0.0471
2025-04-30 2025-03-31 13F AMPHENOL CORP CL A 032095101 367,947 4,429 1.22 24,134 -4.41 0.0345
2025-02-14 2024-12-31 13F AMPHENOL CORP CL A 032095101 363,518 8,672 2.44 25,246 9.19 0.0320
2024-11-13 2024-09-30 13F AMPHENOL CORP CL A 032095101 354,846 -1,402 -0.39 23,122 -3.66 0.0290
2024-08-14 2024-06-30 13F AMPHENOL CORP CL A 032095101 356,248 178,425 100.34 24,000 17.01 0.0314
2024-04-24 2024-03-31 13F AMPHENOL CORP CL A 032095101 177,823 -1,441 -0.80 20,512 15.42 0.0274
2024-02-08 2023-12-31 13F AMPHENOL CORP CL A 032095101 179,264 -4,330 -2.36 17,770 15.24 0.0250
2023-10-25 2023-09-30 13F AMPHENOL CORP CL A 032095101 183,594 -3,605 -1.93 15,420 -3.03 0.0253
2023-07-31 2023-06-30 13F AMPHENOL CORP CL A 032095101 187,199 -1,556 -0.82 15,903 3.09 0.0248
2023-05-08 2023-03-31 13F AMPHENOL CORP CL A 032095101 188,755 -5,069 -2.62 15,425 4.53 0.0261
2023-02-13 2022-12-31 13F AMPHENOL CORP CL A 032095101 193,824 -38,569 -16.60 14,758 -5.17 0.0274
2022-11-14 2022-09-30 13F AMPHENOL CORP CL A 032095101 232,393 -1,470 -0.63 15,561 3.35 0.0303
2022-11-14 2022-06-30 13F/A-2 AMPHENOL CORP CL A 032095101 233,863 -2,903 -1.23 15,056 -15.61 0.0283
2022-09-13 2022-06-30 13F/A-1 AMPHENOL CORP CL A 032095101 234,297 -3,623 15,084 0.0261
2022-08-02 2022-06-30 13F AMPHENOL CORP CL A 032095101 242,995 3,507 18,293 0.0122
2022-11-14 2022-03-31 13F/A-2 AMPHENOL CORP CL A 032095101 236,766 -2,426 -1.01 17,840 -14.72 0.0266
2022-09-13 2022-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 237,920 -1,272 17,926 0.0252
2022-05-09 2022-03-31 13F AMPHENOL CORP CL A 032095101 239,488 296 19,435 0.0264
2022-01-27 2021-12-31 13F AMPHENOL CORP CL A 032095101 239,192 1,501 0.63 20,920 20.20 0.0259
2021-11-12 2021-09-30 13F AMPHENOL CORP CL A 032095101 237,691 -46,746 -16.43 17,405 -10.55 0.0257
2021-07-29 2021-06-30 13F AMPHENOL CORP CL A 032095101 284,437 -614 -0.22 19,458 3.48 0.0293
2021-05-14 2021-03-31 13F AMPHENOL CORP CL A 032095101 285,051 129,788 83.59 18,804 -7.38 0.0322
2021-02-12 2020-12-31 13F AMPHENOL CORP CL A 032095101 155,263 -17,994 -10.39 20,303 8.23 0.0360
2020-11-16 2020-09-30 13F AMPHENOL CORP CL A 032095101 173,257 -4,001,386 -95.85 18,759 -95.31 0.0388
2020-08-14 2020-06-30 13F AMPHENOL CORP CL A 032095101 4,174,643 245,617 6.25 399,973 39.68 0.9318
2020-05-15 2020-03-31 13F AMPHENOL CORP CL A 032095101 3,929,026 -119,687 -2.96 286,348 -34.65 0.8773
2020-02-14 2019-12-31 13F AMPHENOL CORP CL A 032095101 4,048,713 106,776 2.71 438,191 15.19 1.1116
2019-11-14 2019-09-30 13F AMPHENOL CORP CL A 032095101 3,941,937 16,182 0.41 380,397 1.00 1.0674
2019-08-12 2019-06-30 13F AMPHENOL CORP CL A 032095101 3,925,755 -62,114 -1.56 376,637 0.01 1.0776
2019-05-15 2019-03-31 13F AMPHENOL CORP CL A 032095101 3,987,869 -118,843 -2.89 376,614 13.19 1.0682
2019-02-13 2018-12-31 13F AMPHENOL CORP CL A 032095101 4,106,712 -92,717 -2.21 332,725 -15.73 1.1178
2018-11-13 2018-09-30 13F AMPHENOL CORP CL A 032095101 4,199,429 -437,251 -9.43 394,831 -2.29 1.1235
2018-08-10 2018-06-30 13F AMPHENOL CORP CL A 032095101 4,636,680 3,326 0.07 404,086 1.26 1.2429
2018-06-28 2018-03-31 13F/A-1 AMPHENOL CORP CL A 032095101 4,633,354 -688,002 -12.93 399,071 -14.59 1.2899
2018-05-14 2018-03-31 13F AMPHENOL CORP CL A 032095101 3,753,350 -1,568,006 323,276
2018-02-12 2017-12-31 13F AMPHENOL CORP CL A 032095101 5,321,356 -469,820 -8.11 467,215 -4.68 1.4791
2017-11-13 2017-09-30 13F AMPHENOL CORP CL A 032095101 5,791,176 -783,472 -11.92 490,164 0.99 1.6254
2017-08-14 2017-06-30 13F AMPHENOL CORP CL A 032095101 6,574,648 -132,754 -1.98 485,340 1.67 1.4836
2017-05-15 2017-03-31 13F AMPHENOL CORP CL A 032095101 6,707,402 -548,122 -7.55 477,367 -2.09 1.6282
2017-02-13 2016-12-31 13F AMPHENOL CORP CL A 032095101 7,255,524 -539,010 -6.92 487,572 -3.65 1.7407
2016-11-14 2016-09-30 13F AMPHENOL CORP CL A 032095101 7,794,534 -534,486 -6.42 506,022 5.97 1.7393
2016-08-09 2016-06-30 13F AMPHENOL CORP CL A 032095101 8,329,020 -489,374 -5.55 477,503 -6.37 1.6775
2016-05-13 2016-03-31 13F AMPHENOL CORP CL A 032095101 8,818,394 -111,221 -1.25 509,998 9.35 1.7607
2016-02-08 2015-12-31 13F AMPHENOL CORP CL A 032095101 8,929,615 -202,336 -2.22 466,394 0.26 1.5821
2015-11-13 2015-09-30 13F AMPHENOL CORP CL A 032095101 9,131,951 -848,971 -8.51 465,183 -19.60 1.6611
2015-08-11 2015-06-30 13F AMPHENOL CORP CL A 032095101 9,980,922 -326,658 -3.17 578,593 -4.75 1.8839
2015-05-14 2015-03-31 13F AMPHENOL CORP CL A 032095101 10,307,580 -523,504 -4.83 607,426 4.22 1.9337
2015-02-13 2014-12-31 13F/A-1 AMPHENOL CORP CL A 032095101 10,831,084 5,165,589 91.18 582,821 3.02 1.8375
2015-02-09 2014-12-31 13F AMPHENOL CORP CL A 032095101 10,674,193 581,996
2014-11-10 2014-09-30 13F AMPHENOL CORP CL A 032095101 5,665,495 -791,455 -12.26 565,755 -9.05 1.8177
2014-08-08 2014-06-30 13F AMPHENOL CORP CL A 032095101 6,456,950 -135,099 -2.05 622,062 2.96 1.9566
2014-05-13 2014-03-31 13F AMPHENOL CORP CL A 032095101 6,592,049 73,933 1.13 604,162 3.94 1.9252
2014-02-11 2013-12-31 13F AMPHENOL CORP CL A 032095101 6,518,116 817,723 14.35 581,286 31.78 1.8850
2013-11-08 2013-09-30 13F AMPHENOL CORP CL A 032095101 5,700,393 283,930 5.24 441,096 4.48 1.5752
2013-08-13 2013-06-30 13F AMPHENOL CORP CL A 032095101 5,416,463 5,416,463 422,193 1.6909
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.