Ecolab Inc.
MX ˙ BMV ˙ US2788651006
SecurityMX:ECL / Ecolab Inc.
InstitutionDudley & Shanley, Inc.
Latest Disclosed Ownership105,008 shares
Latest Disclosed Value $ 27,934,228
Dudley & Shanley, Inc. reports 0.05% decrease in ownership of ECL / Ecolab Inc.

On April 8, 2026 - Dudley & Shanley, Inc. filed a 13F-HR form disclosing ownership of 105,008 shares of Ecolab Inc. (MX:ECL) valued at $27,934,228 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 9, 2026 disclosing 105,058 shares of Ecolab Inc.. This represents a change in shares of -0.05% 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)
2026-04-08 2026-03-31 13F Ecolab COM 278865100 105,008 -50 -0.05 27,934 1.29 4.4181
2026-01-09 2025-12-31 13F Ecolab COM 278865100 105,058 75 0.07 27,580 -4.07 4.4326
2025-10-08 2025-09-30 13F Ecolab COM 278865100 104,983 0 0.00 28,751 1.64 4.6259
2025-07-09 2025-06-30 13F Ecolab COM 278865100 104,983 120 0.11 28,287 6.40 4.4419
2025-04-09 2025-03-31 13F Ecolab COM 278865100 104,863 10 0.01 26,585 8.20 4.1861
2025-01-03 2024-12-31 13F Ecolab COM 278865100 104,853 -100 -0.10 24,569 -8.31 3.7941
2024-12-23 2024-09-30 13F Ecolab COM 278865100 104,953 -325 -0.31 26,798 6.95 4.1891
2024-07-09 2024-06-30 13F Ecolab COM 278865100 105,278 -2,549 -2.36 25,056 0.64 4.3059
2024-04-19 2024-03-31 13F Ecolab COM 278865100 107,827 1,640 1.54 24,897 18.21 4.2012
2024-01-12 2023-12-31 13F Ecolab COM 278865100 106,187 -1,710 -1.58 21,062 15.24 3.7546
2023-10-13 2023-09-30 13F Ecolab COM 278865100 107,897 1,625 1.53 18,278 -7.87 3.4557
2023-07-21 2023-06-30 13F Ecolab COM 278865100 106,272 0 0.00 19,840 12.78 3.5826
2023-04-13 2023-03-31 13F Ecolab COM 278865100 106,272 -400 -0.37 17,591 13.29 3.3741
2023-01-18 2022-12-31 13F/A-1 Ecolab COM 278865100 106,672 10,700 11.15 15,527 12.03 3.4975
2023-01-13 2022-12-31 13F Ecolab COM 278865100 106,672 10,700 16 3.3913
2022-10-18 2022-09-30 13F Ecolab COM 278865100 95,972 0 0.00 13,860 -6.08 3.8781
2022-07-14 2022-06-30 13F Ecolab COM 278865100 95,972 -20,560 -17.64 14,757 -28.28 3.3058
2022-04-18 2022-03-31 13F Ecolab COM 278865100 116,532 0 0.00 20,575 -24.74 3.8277
2022-01-18 2021-12-31 13F Ecolab COM 278865100 116,532 -2,575 -2.16 27,337 10.02 4.7324
2021-11-05 2021-09-30 13F Ecolab COM 278865100 119,107 220 0.19 24,848 1.47 4.3694
2021-07-12 2021-06-30 13F Ecolab COM 278865100 118,887 -3,785 -3.09 24,487 -6.75 4.0390
2021-04-21 2021-03-31 13F Ecolab COM 278865100 122,672 -170 -0.14 26,260 -1.20 4.5316
2021-01-20 2020-12-31 13F Ecolab COM 278865100 122,842 1,850 1.53 26,578 9.92 4.8913
2020-11-03 2020-09-30 13F Ecolab COM 278865100 120,992 2,049 1.72 24,179 2.18 5.8727
2020-07-21 2020-06-30 13F Ecolab COM 278865100 118,943 -700 -0.59 23,664 26.93 6.5481
2020-04-20 2020-03-31 13F Ecolab COM 278865100 119,643 4,420 3.84 18,644 -16.16 4.6841
2020-01-17 2019-12-31 13F Ecolab COM 278865100 115,223 5,000 4.54 22,237 1.87 5.0145
2019-10-15 2019-09-30 13F Ecolab COM 278865100 110,223 -39,772 -26.52 21,829 -26.29 5.3929
2019-07-10 2019-06-30 13F Ecolab COM 278865100 149,995 -3,466 -2.26 29,615 9.31 7.1474
2019-04-15 2019-03-31 13F Ecolab COM 278865100 153,461 -2,194 -1.41 27,092 18.12 7.0127
2019-01-15 2018-12-31 13F Ecolab COM 278865100 155,655 145 0.09 22,936 -5.93 5.7410
2018-10-29 2018-09-30 13F Ecolab COM 278865100 155,510 0 0.00 24,381 11.72 4.6134
2018-07-20 2018-06-30 13F Ecolab COM 278865100 155,510 -800 -0.51 21,823 1.86 4.2301
2018-04-25 2018-03-31 13F Ecolab COM 278865100 156,310 -700 -0.45 21,425 1.69 4.0991
2018-01-22 2017-12-31 13F Ecolab COM 278865100 157,010 -2,300 -1.44 21,068 2.83 4.7324
2017-10-17 2017-09-30 13F Ecolab COM 278865100 159,310 -29,680 -15.70 20,489 -18.33 4.5219
2017-07-14 2017-06-30 13F Ecolab COM 278865100 188,990 -1,000 -0.53 25,088 5.35 5.1687
2017-04-24 2017-03-31 13F Ecolab COM 278865100 189,990 -250 -0.13 23,813 6.78 4.9621
2017-01-23 2016-12-31 13F Ecolab COM 278865100 190,240 0 0.00 22,300 -3.70 4.7489
2016-11-02 2016-09-30 13F Ecolab COM 278865100 190,240 -3,000 -1.55 23,156 1.04 5.3193
2016-07-29 2016-06-30 13F Ecolab COM 278865100 193,240 0 0.00 22,918 6.35 5.2262
2016-04-22 2016-03-31 13F Ecolab COM 278865100 193,240 -2,200 -1.13 21,550 -3.60 4.7073
2016-01-27 2015-12-31 13F Ecolab COM 278865100 195,440 -1,100 -0.56 22,354 3.66 4.9466
2015-10-20 2015-09-30 13F Ecolab COM 278865100 196,540 0 0.00 21,564 -2.97 4.7803
2015-07-09 2015-06-30 13F Ecolab COM 278865100 196,540 0 0.00 22,223 -1.14 4.4134
2015-04-23 2015-03-31 13F Ecolab COM 278865100 196,540 196,540 0.00 22,480 4.5274
2015-01-29 2014-12-31 13F Ecolab COM 278865100 0 -171,200 -100.00 0 -100.00
2014-10-17 2014-09-30 13F Ecolab COM 278865100 171,200 -2,600 -1.50 19,659 1.59 4.1169
2014-07-24 2014-06-30 13F Ecolab COM 278865100 173,800 -500 -0.29 19,351 2.81 3.8974
2014-04-17 2014-03-31 13F Ecolab COM 278865100 174,300 -600 -0.34 18,823 3.21 3.8235
2014-01-15 2013-12-31 13F Ecolab COM 278865100 174,900 -400 -0.23 18,237 5.34 3.5386
2013-10-16 2013-09-30 13F Ecolab COM 278865100 175,300 600 0.34 17,313 16.33 3.5902
2013-07-29 2013-06-30 13F Ecolab COM 278865100 174,700 174,700 14,883 3.4681
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.