AMETEK, Inc.
US ˙ NYSE ˙ US0311001004

SecurityAME / AMETEK, Inc.
InstitutionBoston Partners
Latest Disclosed Ownership1,255,789 shares
Latest Disclosed Value $ 269,215,028
Boston Partners reports 4.03% decrease in ownership of AME / AMETEK, Inc.

On May 11, 2026 - Boston Partners filed a 13F-HR form disclosing ownership of 1,255,789 shares of AMETEK, Inc. (US:AME) valued at $269,190,930 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,308,553 shares of AMETEK, Inc.. This represents a change in shares of -4.03% during the quarter. The current value of the position is $286,608,723 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 AMETEK COM 031100100 1,255,789 -52,764 -4.03 269,215 0.19 0.1205
2026-02-13 2025-12-31 13F AMETEK COM 031100100 1,308,553 -33,572 -2.50 268,702 6.45 0.2782
2025-11-13 2025-09-30 13F AMETEK COM 031100100 1,342,125 -176,422 -11.62 252,413 -8.16 0.2592
2025-08-12 2025-06-30 13F/A-1 AMETEK COM 031100100 1,518,547 -380,109 -20.02 274,824 -15.89 0.3052
2025-08-07 2025-06-30 13F AMETEK COM 031100100 1,517,365 -381,291 274,610 0.1261
2025-05-13 2025-03-31 13F AMETEK COM 031100100 1,898,656 -214,502 -10.15 326,754 -14.23 0.3952
2025-02-11 2024-12-31 13F AMETEK COM 031100100 2,113,158 -574,082 -21.36 380,976 -17.43 0.4634
2024-11-12 2024-09-30 13F AMETEK COM 031100100 2,687,240 -580,501 -17.76 461,408 -15.31 0.5446
2024-08-14 2024-06-30 13F AMETEK COM 031100100 3,267,741 204,153 6.66 544,792 -2.76 0.6768
2024-05-28 2024-03-31 13F/A-1 AMETEK COM 031100100 3,063,588 90,271 3.04 560,278 14.28 0.6674
2024-05-13 2024-03-31 13F AMETEK COM 031100100 3,063,588 90,271 560,278 0.6673
2024-02-07 2023-12-31 13F AMETEK COM 031100100 2,973,317 -610,885 -17.04 490,254 -7.42 0.6493
2023-11-08 2023-09-30 13F AMETEK COM 031100100 3,584,202 -10,726 -0.30 529,527 -9.00 0.7331
2023-08-10 2023-06-30 13F AMETEK COM 031100100 3,594,928 -17,635 -0.49 581,888 10.85 0.7832
2023-05-09 2023-03-31 13F AMETEK COM 031100100 3,612,563 10,081 0.28 524,944 4.28 0.7217
2023-02-08 2022-12-31 13F AMETEK COM 031100100 3,602,482 46,725 1.31 503,403 24.77 0.6810
2022-11-09 2022-09-30 13F AMETEK COM 031100100 3,555,757 159,056 4.68 403,458 8.06 0.5905
2022-08-10 2022-06-30 13F AMETEK COM 031100100 3,396,701 28,581 0.85 373,377 -16.76 0.5218
2022-05-10 2022-03-31 13F AMETEK COM 031100100 3,368,120 55,110 1.66 448,558 -7.92 0.5434
2022-02-04 2021-12-31 13F AMETEK COM 031100100 3,313,010 -55,035 -1.63 487,127 16.63 0.5868
2021-11-05 2021-09-30 13F AMETEK COM 031100100 3,368,045 96,210 2.94 417,686 -4.38 0.5291
2021-08-12 2021-06-30 13F AMETEK COM 031100100 3,271,835 67,569 2.11 436,808 6.71 0.5571
2021-05-10 2021-03-31 13F AMETEK COM 031100100 3,204,266 -172,689 -5.11 409,358 0.23 0.5490
2021-02-10 2020-12-31 13F/A-1 AMETEK COM 031100100 3,376,955 -982,139 -22.53 408,410 -5.74 0.6352
2021-02-04 2020-12-31 13F AMETEK COM 031100100 3,376,955 -982,139 408,410 245,021.7247
2020-11-13 2020-09-30 13F/A-1 AMETEK COM 031100100 4,359,094 -66,254 -1.50 433,293 9.56 0.7890
2020-11-09 2020-09-30 13F AMETEK COM 031100100 4,425,348 0 395,482 290,330.8987
2020-08-12 2020-06-30 13F AMETEK COM 031100100 4,425,348 -572,656 -11.46 395,482 9.89 0.7264
2020-05-13 2020-03-31 13F AMETEK COM 031100100 4,998,004 1,272,721 34.16 359,892 -3.14 0.7147
2020-02-06 2019-12-31 13F/A-1 AMETEK INC COM 031100100 3,725,283 90,405 2.49 371,575 11.32 0.4915
2019-11-20 2019-09-30 13F/A-1 AMETEK INC COM 031100100 3,634,878 -675,670 -15.67 333,788 -14.76 0.4520
2019-11-08 2019-09-30 13F AMETEK INC COM 031100100 4,308,684 -1,864 391,448 0.5177
2019-08-26 2019-06-30 13F/A-1 AMETEK INC COM 031100100 4,310,548 -575,471 -11.78 391,572 -3.41 0.5135
2019-08-09 2019-06-30 13F AMETEK INC COM 031100100 4,310,680 -575,339 391,584
2019-05-13 2019-03-31 13F/A-1 AMETEK INC COM 031100100 4,886,019 -821,920 -14.40 405,393 4.91 0.5371
2019-05-03 2019-03-31 13F AMETEK INC COM 031100100 4,886,019 -821,920 405,393
2019-02-07 2018-12-31 13F AMETEK INC COM 031100100 5,707,939 5,270 0.09 386,428 -14.35 0.5553
2018-11-14 2018-09-30 13F AMETEK INC COM 031100100 5,702,669 265,978 4.89 451,196 15.01 0.5243
2018-08-03 2018-06-30 13F AMETEK INC COM 031100100 5,436,691 179,026 3.41 392,311 -1.78 0.4702
2018-05-04 2018-03-31 13F AMETEK INC COM 031100100 5,257,665 85,260 1.65 399,425 6.56 0.4816
2018-02-14 2017-12-31 13F/A-1 AMETEK INC COM 031100100 5,172,405 -61,063 -1.17 374,845 8.46 0.4416
2018-02-01 2017-12-31 13F AMETEK INC COM 031100100 5,172,405 -61,063 374,845
2017-11-02 2017-09-30 13F AMETEK INC COM 031100100 5,233,468 932,008 21.67 345,618 32.65 0.4271
2017-08-02 2017-06-30 13F AMETEK INC COM 031100100 4,301,460 862,044 25.06 260,539 40.07 0.3313
2017-05-03 2017-03-31 13F AMETEK INC COM 031100100 3,439,416 2,897,568 534.76 186,004 606.33 0.2375
2017-02-06 2016-12-31 13F AMETEK INC COM 031100100 541,848 -104,517 -16.17 26,334 -14.73 0.0346
2016-11-09 2016-09-30 13F AMETEK INC COM 031100100 646,365 -2,383 -0.37 30,883 2.97 0.0432
2016-08-05 2016-06-30 13F AMETEK INC COM 031100100 648,748 -98,475 -13.18 29,992 -19.69 0.0433
2016-05-12 2016-03-31 13F AMETEK INC COM 031100100 747,223 747,223 37,346 0.0550
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.