AMETEK, Inc.
MX ˙ BMV ˙ US0311001004
SecurityMX:AME / AMETEK, Inc.
InstitutionDudley & Shanley, Inc.
Latest Disclosed Ownership139,746 shares
Latest Disclosed Value $ 29,955,953
Dudley & Shanley, Inc. reports 0.04% decrease in ownership of AME / AMETEK, Inc.

On April 8, 2026 - Dudley & Shanley, Inc. filed a 13F-HR form disclosing ownership of 139,746 shares of AMETEK, Inc. (MX:AME) valued at $29,955,953 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 9, 2026 disclosing 139,796 shares of AMETEK, Inc.. This represents a change in shares of -0.04% 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.

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)
2026-04-08 2026-03-31 13F Ametek COM 031100100 139,746 -50 -0.04 29,956 4.37 4.7378
2026-01-09 2025-12-31 13F Ametek COM 031100100 139,796 10 0.01 28,702 9.22 4.6129
2025-10-08 2025-09-30 13F Ametek COM 031100100 139,786 100 0.07 26,280 3.96 4.2284
2025-07-09 2025-06-30 13F Ametek COM 031100100 139,686 260 0.19 25,278 5.32 3.9694
2025-04-09 2025-03-31 13F Ametek COM 031100100 139,426 110 0.08 24,001 -4.43 3.7792
2025-01-03 2024-12-31 13F Ametek COM 031100100 139,316 -118 -0.08 25,113 4.89 3.8781
2024-12-23 2024-09-30 13F Ametek COM 031100100 139,434 14,105 11.25 23,942 14.59 3.7427
2024-07-09 2024-06-30 13F Ametek COM 031100100 125,329 -3,435 -2.67 20,894 -11.28 3.5905
2024-04-19 2024-03-31 13F Ametek COM 031100100 128,764 1,145 0.90 23,551 11.91 3.9740
2024-01-12 2023-12-31 13F Ametek COM 031100100 127,619 -1,455 -1.13 21,043 10.34 3.7512
2023-10-13 2023-09-30 13F Ametek COM 031100100 129,074 0 0.00 19,072 -8.72 3.6059
2023-07-21 2023-06-30 13F Ametek COM 031100100 129,074 0 0.00 20,894 11.39 3.7731
2023-04-13 2023-03-31 13F Ametek COM 031100100 129,074 32,325 33.41 18,758 38.77 3.5980
2023-01-18 2022-12-31 13F/A-1 Ametek COM 031100100 96,749 39,185 68.07 13,518 107.06 3.0449
2023-01-13 2022-12-31 13F Ametek COM 031100100 96,749 39,185 14 2.9525
2022-10-18 2022-09-30 13F Ametek COM 031100100 57,564 40,540 238.13 6,528 248.90 1.8266
2022-07-14 2022-06-30 13F Ametek COM 031100100 17,024 0 0.00 1,871 -17.47 0.4191
2022-04-18 2022-03-31 13F Ametek COM 031100100 17,024 0 0.00 2,267 -9.43 0.4217
2022-01-18 2021-12-31 13F Ametek COM 031100100 17,024 0 0.00 2,503 18.57 0.4333
2021-11-05 2021-09-30 13F Ametek COM 031100100 17,024 0 0.00 2,111 -7.13 0.3712
2021-07-12 2021-06-30 13F Ametek COM 031100100 17,024 0 0.00 2,273 4.55 0.3749
2021-04-21 2021-03-31 13F Ametek COM 031100100 17,024 0 0.00 2,174 5.59 0.3752
2021-01-20 2020-12-31 13F Ametek COM 031100100 17,024 0 0.00 2,059 21.69 0.3789
2020-11-03 2020-09-30 13F Ametek COM 031100100 17,024 -320 -1.85 1,692 9.16 0.4110
2020-07-21 2020-06-30 13F Ametek COM 031100100 17,344 600 3.58 1,550 28.52 0.4289
2020-04-20 2020-03-31 13F Ametek COM 031100100 16,744 100 0.60 1,206 -27.35 0.3030
2020-01-17 2019-12-31 13F Ametek COM 031100100 16,644 0 0.00 1,660 8.64 0.3743
2019-10-15 2019-09-30 13F Ametek COM 031100100 16,644 -26,780 -61.67 1,528 -61.27 0.3775
2019-07-10 2019-06-30 13F Ametek COM 031100100 43,424 -8,425 -16.25 3,945 -8.30 0.9521
2019-04-15 2019-03-31 13F Ametek COM 031100100 51,849 18,275 54.43 4,302 89.27 1.1136
2019-01-15 2018-12-31 13F Ametek COM 031100100 33,574 0 0.00 2,273 -14.42 0.5689
2018-10-29 2018-09-30 13F Ametek COM 031100100 33,574 -425 -1.25 2,656 8.28 0.5026
2018-07-20 2018-06-30 13F Ametek COM 031100100 33,999 0 0.00 2,453 -5.03 0.4755
2018-04-25 2018-03-31 13F Ametek COM 031100100 33,999 33,999 2,583 0.4942
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.