Ecolab Inc.
US ˙ NYSE ˙ US2788651006

SecurityECL / Ecolab Inc.
InstitutionAsset Management One Co., Ltd.
Latest Disclosed Ownership128,361 shares
Latest Disclosed Value $ 34,146,593
Asset Management One Co., Ltd. reports 13.13% increase in ownership of ECL / Ecolab Inc.

On May 8, 2026 - Asset Management One Co., Ltd. filed a 13F-HR form disclosing ownership of 128,361 shares of Ecolab Inc. (US:ECL) valued at $34,146,593 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 27, 2026 disclosing 113,460 shares of Ecolab Inc.. This represents a change in shares of 13.13% during the quarter. The current value of the position is $32,818,057 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)
2026-05-08 2026-03-31 13F ECOLAB COM 278865100 128,361 14,901 13.13 34,147 13.37 0.1007
2026-01-27 2025-12-31 13F ECOLAB COM 278865100 113,460 754 0.67 30,119 -2.42 0.0837
2025-10-22 2025-09-30 13F ECOLAB COM 278865100 112,706 809 0.72 30,866 2.37 0.0894
2025-07-31 2025-06-30 13F ECOLAB COM 278865100 111,897 5,372 5.04 30,150 11.64 0.0945
2025-04-23 2025-03-31 13F ECOLAB COM 278865100 106,525 5,524 5.47 27,006 12.46 0.0934
2025-01-30 2024-12-31 13F ECOLAB COM 278865100 101,001 1,125 1.13 24,014 -5.84 0.0825
2024-10-30 2024-09-30 13F ECOLAB COM 278865100 99,876 -20 -0.02 25,501 7.26 0.0907
2024-07-18 2024-06-30 13F ECOLAB COM 278865100 99,896 734 0.74 23,775 3.84 0.0910
2024-05-02 2024-03-31 13F ECOLAB COM 278865100 99,162 -4,245 -4.11 22,897 11.34 0.0882
2024-01-24 2023-12-31 13F ECOLAB COM 278865100 103,407 -1,296 -1.24 20,565 15.94 0.0828
2023-10-19 2023-09-30 13F ECOLAB COM 278865100 104,703 -665 -0.63 17,737 -9.84 0.0790
2023-07-31 2023-06-30 13F ECOLAB COM 278865100 105,368 454 0.43 19,671 13.27 0.0833
2023-04-25 2023-03-31 13F ECOLAB COM 278865100 104,914 3,868 3.83 17,366 16.41 0.0787
2023-02-06 2022-12-31 13F ECOLAB COM 278865100 101,046 -11,850 -10.50 14,918 -8.50 0.0727
2022-11-04 2022-09-30 13F ECOLAB COM 278865100 112,896 -1,891 -1.65 16,304 -7.62 0.0830
2022-07-29 2022-06-30 13F ECOLAB COM 278865100 114,787 2,317 2.06 17,649 -11.12 0.0829
2022-05-13 2022-03-31 13F ECOLAB COM 278865100 112,470 -4,930 -4.20 19,857 -28.21 0.0775
2022-02-09 2021-12-31 13F ECOLAB COM 278865100 117,400 5,191 4.63 27,659 18.16 0.0964
2021-11-02 2021-09-30 13F ECOLAB COM 278865100 112,209 -5,517 -4.69 23,409 -3.46 0.0897
2021-08-03 2021-06-30 13F ECOLAB COM 278865100 117,726 -5,098 -4.15 24,248 -7.77 0.0902
2021-05-14 2021-03-31 13F ECOLAB COM 278865100 122,824 -5,093 -3.98 26,292 -4.19 0.1044
2021-02-12 2020-12-31 13F ECOLAB COM 278865100 127,917 831 0.65 27,441 8.05 0.1130
2020-11-13 2020-09-30 13F ECOLAB COM 278865100 127,086 -3,812 -2.91 25,397 -2.49 0.1167
2020-08-14 2020-06-30 13F ECOLAB COM 278865100 130,898 -3,198 -2.38 26,045 24.65 0.1281
2020-05-14 2020-03-31 13F ECOLAB COM 278865100 134,096 1,343 1.01 20,894 -18.45 0.1220
2020-02-14 2019-12-31 13F ECOLAB COM 278865100 132,753 -9,121 -6.43 25,620 -8.81 0.1155
2019-11-14 2019-09-30 13F ECOLAB COM 278865100 141,874 3,152 2.27 28,096 2.58 0.1353
2019-08-14 2019-06-30 13F ECOLAB COM 278865100 138,722 12,424 9.84 27,390 22.85 0.1345
2019-05-15 2019-03-31 13F ECOLAB COM 278865100 126,298 -284,247 -69.24 22,296 -63.11 0.1206
2019-02-13 2018-12-31 13F ECOLAB COM 278865100 410,545 1,285 0.31 60,431 -5.82 0.1440
2018-11-14 2018-09-30 13F ECOLAB COM 278865100 409,260 -1,465 -0.36 64,165 11.34 0.1317
2018-08-14 2018-06-30 13F ECOLAB COM 278865100 410,725 1,032 0.25 57,631 2.63 0.1260
2018-05-14 2018-03-31 13F ECOLAB COM 278865100 409,693 -3,281 -0.79 56,156 1.32 0.1265
2018-02-14 2017-12-31 13F ECOLAB COM 278865100 412,974 5,119 1.26 55,422 5.63 0.1223
2017-11-14 2017-09-30 13F ECOLAB COM 278865100 407,855 -3,325 -0.81 52,468 -3.83 0.1232
2017-08-14 2017-06-30 13F ECOLAB COM 278865100 411,180 689 0.17 54,556 6.03 0.1393
2017-05-11 2017-03-31 13F ECOLAB COM 278865100 410,491 -41,806 -9.24 51,451 -2.99 0.1351
2017-05-02 2016-12-31 13F/A-1 ECOLAB COM 278865100 452,297 422,557 1,420.84 53,035 1,374.83 0.1356
2017-02-13 2016-12-31 13F ECOLAB COM 278865100 468,014 54,877
2016-11-07 2016-09-30 13F ECOLAB Com 278865100 29,740 933 3.24 3,596 6.58 0.0534
2016-08-03 2016-06-30 13F ECOLAB Com 278865100 28,807 -753 -2.55 3,374 1.69 0.0506
2016-05-05 2016-03-31 13F ECOLAB Com 278865100 29,560 5,773 24.27 3,318 20.17 0.0484
2016-01-28 2015-12-31 13F ECOLAB Com 278865100 23,787 -1,246 -4.98 2,761 1.62 0.0412
2015-11-12 2015-09-30 13F ECOLAB Com 278865100 25,033 0 0.00 2,717 -3.89 0.0413
2015-08-06 2015-06-30 13F ECOLAB Com 278865100 25,033 -1,383 -5.24 2,827 -6.73 0.0392
2015-05-11 2015-03-31 13F ECOLAB COM 278865100 26,416 0 0.00 3,031 7.83 0.0374
2015-02-09 2014-12-31 13F ECOLAB COM 278865100 26,416 -5,228 -16.52 2,811 -23.49 0.0365
2014-11-05 2014-09-30 13F ECOLAB COM 278865100 31,644 606 1.95 3,674 8.67 0.0507
2014-08-12 2014-06-30 13F ECOLAB COM 278865100 31,038 0 0.00 3,381 2.33 0.0505
2014-05-05 2014-03-31 13F ECOLAB COM 278865100 31,038 155 0.50 3,304 2.45 0.0521
2014-02-05 2013-12-31 13F/A-1 ECOLAB COM 278865100 30,883 -10,571 -25.50 3,225 -20.78 0.0500
2014-01-29 2013-12-31 13F ECOLAB COM 278865100 30,883 3,225
2014-02-05 2013-09-30 13F/A-1 ECOLAB COM 278865100 41,454 2,164 5.51 4,071 20.98 0.0613
2013-11-06 2013-09-30 13F ECOLAB Com 278865100 41,454 4,071
2014-02-12 2013-06-30 13F/A-1 ECOLAB COM 278865100 39,290 39,290 3,365 0.0546
2013-08-05 2013-06-30 13F ECOLAB Com 278865100 39,290 3,365
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.