AMETEK, Inc.
MX ˙ BMV ˙ US0311001004
SecurityMX:AME / AMETEK, Inc.
InstitutionMarshall Wace, Llp
Latest Disclosed Ownership173,270 shares
Latest Disclosed Value $ 37,142,157
Marshall Wace, Llp reports 19.02% increase in ownership of AME / AMETEK, Inc.

On May 14, 2026 - Marshall Wace, Llp filed a 13F-HR form disclosing ownership of 173,270 shares of AMETEK, Inc. (MX:AME) valued at $37,142,157 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 145,576 shares of AMETEK, Inc.. This represents a change in shares of 19.02% during the quarter.

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)
2026-05-14 2026-03-31 13F AMETEK COMMON STOCK 031100100 173,270 27,694 19.02 37,142 24.27 0.0370
2026-02-13 2025-12-31 13F AMETEK COMMON STOCK 031100100 145,576 37,230 34.36 29,888 46.73 0.0272
2025-11-13 2025-09-30 13F AMETEK COMMON STOCK 031100100 108,346 -217,735 -66.77 20,369 -65.48 0.0207
2025-08-13 2025-06-30 13F AMETEK COMMON STOCK 031100100 326,081 326,081 59,008 0.0665
2025-05-15 2025-03-31 13F AMETEK COMMON STOCK 031100100 0 -19,219 -100.00 0 -100.00
2025-02-13 2024-12-31 13F AMETEK COMMON STOCK 031100100 19,219 14,419 300.40 3,464 320.39 0.0042
2024-11-14 2024-09-30 13F AMETEK COMMON STOCK 031100100 4,800 -29,159 -85.87 824 -85.44 0.0010
2024-08-14 2024-06-30 13F AMETEK COMMON STOCK 031100100 33,959 32,859 2,987.18 5,661 2,716.42 0.0076
2024-05-15 2024-03-31 13F AMETEK COMMON STOCK 031100100 1,100 -1,200 -52.17 201 -46.97 0.0003
2024-02-14 2023-12-31 13F AMETEK COMMON STOCK 031100100 2,300 2,300 379 0.0006
2023-02-14 2022-12-31 13F AMETEK COMMON STOCK 031100100 0 -231,292 -100.00 0 -100.00
2022-11-14 2022-09-30 13F AMETEK COMMON STOCK 031100100 231,292 -395,291 -63.09 26,231 -61.90 0.0575
2022-08-15 2022-06-30 13F AMETEK COMMON STOCK 031100100 626,583 300,749 92.30 68,855 58.67 0.1417
2022-05-16 2022-03-31 13F AMETEK COMMON STOCK 031100100 325,834 5,736 1.79 43,395 -7.80 0.0822
2022-02-14 2021-12-31 13F AMETEK COMMON STOCK 031100100 320,098 320,098 47,068 0.0869
2021-02-16 2020-12-31 13F AMETEK COMMON STOCK 031100100 0 -45,787 -100.00 0 -100.00
2020-11-16 2020-09-30 13F AMETEK COMMON STOCK 031100100 45,787 41,678 1,014.31 4,552 1,140.33 0.0291
2020-08-13 2020-06-30 13F AMETEK COMMON STOCK 031100100 4,109 -208,854 -98.07 367 -97.61 0.0026
2020-05-15 2020-03-31 13F AMETEK COMMON STOCK 031100100 212,963 -199,921 -48.42 15,338 -62.76 0.1532
2020-02-14 2019-12-31 13F AMETEK COMMON STOCK 031100100 412,884 204,557 98.19 41,182 115.29 0.2830
2019-11-14 2019-09-30 13F AMETEK COMMON STOCK 031100100 208,327 41,332 24.75 19,129 26.10 0.1504
2019-08-14 2019-06-30 13F AMETEK COMMON STOCK 031100100 166,995 51,542 44.64 15,170 58.37 0.1248
2019-05-29 2019-03-31 13F/A-1 AMETEK COMMON STOCK 031100100 115,453 97,244 534.04 9,579 676.89 0.0900
2019-05-14 2019-03-31 13F AMETEK COMMON STOCK 031100100 115,453 97,244 9,579
2019-02-14 2018-12-31 13F AMETEK COMMON STOCK 031100100 18,209 18,209 1,233 0.0126
2017-05-12 2017-03-31 13F AMETEK COMMON STOCK 031100100 0 -390,898 -100.00 0 -100.00
2017-02-10 2016-12-31 13F AMETEK COMMON STOCK 031100100 390,898 244,710 167.39 18,998 171.98 0.1249
2016-11-10 2016-09-30 13F AMETEK COMMON STOCK 031100100 146,188 -208,899 -58.83 6,985 -57.45 0.0497
2016-08-12 2016-06-30 13F AMETEK COMMON STOCK 031100100 355,087 -6,659 -1.84 16,416 -9.20 0.1380
2016-05-13 2016-03-31 13F AMETEK COMMON STOCK 031100100 361,746 361,746 0.00 18,080 0.1742
2015-08-14 2015-06-30 13F AMETEK COMMON STOCK 031100100 0 -24,202 -100.00 0 -100.00
2015-05-11 2015-03-31 13F AMETEK COMMON STOCK 031100100 24,202 24,202 0.00 1,272 0.0166
2014-11-13 2014-09-30 13F AMETEK COMMON STOCK 031100100 0 -8,580 -100.00 0 -100.00
2014-08-14 2014-06-30 13F AMETEK COMMON STOCK 031100100 8,580 8,580 449 0.0066
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.