Ecolab Inc.
MX ˙ BMV ˙ US2788651006
SecurityMX:ECL / Ecolab Inc.
InstitutionWelch & Forbes Llc
Latest Disclosed Ownership470,443 shares
Latest Disclosed Value $ 125,147,368
Welch & Forbes Llc reports 0.36% decrease in ownership of ECL / Ecolab Inc.

On May 1, 2026 - Welch & Forbes Llc filed a 13F-HR form disclosing ownership of 470,443 shares of Ecolab Inc. (MX:ECL) valued at $125,147,368 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 472,164 shares of Ecolab Inc.. This represents a change in shares of -0.36% 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)
2026-05-01 2026-03-31 13F ECOLAB COM 278865100 470,443 -1,721 -0.36 125,147 0.96 1.6180
2026-02-10 2025-12-31 13F ECOLAB COM 278865100 472,164 -1,418 -0.30 123,952 -4.43 1.5017
2025-11-04 2025-09-30 13F ECOLAB COM 278865100 473,582 -746 -0.16 129,695 1.48 1.5620
2025-08-05 2025-06-30 13F ECOLAB COM 278865100 474,328 2,613 0.55 127,803 6.87 1.5959
2025-05-02 2025-03-31 13F ECOLAB COM 278865100 471,715 3,034 0.65 119,589 8.89 1.5646
2025-02-07 2024-12-31 13F ECOLAB COM 278865100 468,681 -3,774 -0.80 109,821 -8.96 1.4119
2024-11-04 2024-09-30 13F ECOLAB COM 278865100 472,455 206 0.04 120,632 5.87 1.5352
2024-08-02 2024-06-30 13F ECOLAB COM 278865100 472,249 1,642 0.35 113,943 4.86 1.5205
2024-05-03 2024-03-31 13F ECOLAB COM 278865100 470,607 3,242 0.69 108,663 17.22 1.4917
2024-02-06 2023-12-31 13F ECOLAB COM 278865100 467,365 4,962 1.07 92,702 18.35 1.4003
2023-11-03 2023-09-30 13F ECOLAB COM 278865100 462,403 6,281 1.38 78,331 -8.01 1.2952
2023-07-28 2023-06-30 13F ECOLAB COM 278865100 456,122 712 0.16 85,154 12.96 1.3432
2023-04-14 2023-03-31 13F ECOLAB COM 278865100 455,410 8,039 1.80 75,384 15.76 1.2765
2023-02-02 2022-12-31 13F ECOLAB COM 278865100 447,371 -10,534 -2.30 65,119 -1.53 1.1671
2022-10-31 2022-09-30 13F ECOLAB COM 278865100 457,905 3,418 0.75 66,131 -5.37 1.2915
2022-07-22 2022-06-30 13F ECOLAB COM 278865100 454,487 10,842 2.44 69,882 -10.78 1.2786
2022-04-25 2022-03-31 13F ECOLAB COM 278865100 443,645 16,773 3.93 78,329 -21.78 1.2340
2022-01-19 2021-12-31 13F ECOLAB COM 278865100 426,872 5,549 1.32 100,140 13.93 1.4991
2021-10-13 2021-09-30 13F ECOLAB COM 278865100 421,323 5,660 1.36 87,897 2.67 1.4607
2021-07-22 2021-06-30 13F ECOLAB COM 278865100 415,663 5,390 1.31 85,614 -2.52 1.4465
2021-04-14 2021-03-31 13F ECOLAB COM 278865100 410,273 13,127 3.31 87,827 2.21 1.6219
2021-01-20 2020-12-31 13F ECOLAB COM 278865100 397,146 -1,227 -0.31 85,927 7.93 1.6809
2020-10-23 2020-09-30 13F ECOLAB COM 278865100 398,373 15,813 4.13 79,611 4.60 1.7180
2020-07-15 2020-06-30 13F ECOLAB COM 278865100 382,560 147 0.04 76,111 27.72 1.7828
2020-04-17 2020-03-31 13F ECOLAB COM 278865100 382,413 975 0.26 59,591 -19.05 1.6644
2020-01-17 2019-12-31 13F ECOLAB COM 278865100 381,438 370 0.10 73,614 -2.46 1.6378
2019-10-11 2019-09-30 13F ECOLAB COM 278865100 381,068 -2,538 -0.66 75,467 -0.36 1.8010
2019-07-12 2019-06-30 13F ECOLAB COM 278865100 383,606 -5,340 -1.37 75,739 10.30 1.8438
2019-04-29 2019-03-31 13F ECOLAB COM 278865100 388,946 -11,958 -2.98 68,665 16.24 1.7226
2019-02-05 2018-12-31 13F ECOLAB COM 278865100 400,904 1,367 0.34 59,074 -5.69 1.6654
2018-10-17 2018-09-30 13F ECOLAB COM 278865100 399,537 -1,256 -0.31 62,640 11.37 1.4931
2018-07-16 2018-06-30 13F ECOLAB COM 278865100 400,793 884 0.22 56,243 2.61 1.4542
2018-04-12 2018-03-31 13F ECOLAB COM 278865100 399,909 8,019 2.05 54,815 4.24 1.4125
2018-01-26 2017-12-31 13F ECOLAB COM 278865100 391,890 -2,174 -0.55 52,584 3.76 1.4035
2017-11-13 2017-09-30 13F ECOLAB COM 278865100 394,064 1,352 0.34 50,680 -2.79 1.3340
2017-07-31 2017-06-30 13F ECOLAB COM 278865100 392,712 5,369 1.39 52,132 7.38 1.4570
2017-07-31 2017-03-31 13F/A-1 ECOLAB COM 278865100 387,343 7,316 1.93 48,550 8.99 1.3896
2017-04-27 2017-03-31 13F ECOLAB COM 278865100 387,493 48,569
2017-02-07 2016-12-31 13F ECOLAB COM 278865100 380,027 5,171 1.38 44,546 -2.37 1.3330
2016-11-02 2016-09-30 13F ECOLAB COM 278865100 374,856 -10,208 -2.65 45,628 -0.09 1.5778
2016-08-02 2016-06-30 13F ECOLAB COM 278865100 385,064 3,472 0.91 45,669 7.32 1.3917
2016-05-05 2016-03-31 13F ECOLAB COM 278865100 381,592 19,648 5.43 42,555 2.79 1.3253
2016-01-27 2015-12-31 13F ECOLAB COM 278865100 361,944 3,027 0.84 41,399 5.13 1.3283
2015-11-05 2015-09-30 13F ECOLAB COM 278865100 358,917 6,264 1.78 39,380 -1.24 1.3145
2015-08-11 2015-06-30 13F ECOLAB COM 278865100 352,653 -4,621 -1.29 39,874 -2.43 1.2406
2015-04-30 2015-03-31 13F ECOLAB COM 278865100 357,274 357,274 0.00 40,865 1.2279
2015-01-27 2014-12-31 13F ECOLAB COM 278865100 0 -357,442 -100.00 0 -100.00
2014-10-27 2014-09-30 13F ECOLAB COM 278865100 357,442 832 0.23 41,045 3.37 1.2529
2014-07-31 2014-06-30 13F ECOLAB COM 278865100 356,610 -4,037 -1.12 39,705 1.95 1.2532
2014-05-01 2014-03-31 13F ECOLAB COM 278865100 360,647 -5,126 -1.40 38,946 2.12 1.2336
2014-01-17 2013-12-31 13F ECOLAB COM 278865100 365,773 -17,326 -4.52 38,138 0.80 1.2075
2013-10-31 2013-09-30 13F ECOLAB COM 278865100 383,099 -7,563 -1.94 37,836 13.69 1.2736
2013-08-08 2013-06-30 13F ECOLAB COM 278865100 390,662 390,662 33,280 1.1898
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.