Waters Corporation
US ˙ NYSE ˙ US9418481035

SecurityWAT / Waters Corporation
InstitutionBoston Trust Walden Corp
Latest Disclosed Ownership105,541 shares
Latest Disclosed Value $ 31,430,110
Boston Trust Walden Corp reports 6.11% decrease in ownership of WAT / Waters Corporation

On April 24, 2026 - Boston Trust Walden Corp filed a 13F-HR form disclosing ownership of 105,541 shares of Waters Corporation (US:WAT) valued at $31,430,110 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 28, 2026 disclosing 112,407 shares of Waters Corporation. This represents a change in shares of -6.11% during the quarter. The current value of the position is $40,081,306 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)
2026-04-24 2026-03-31 13F WATERS COMMON STOCK 941848103 105,541 -6,866 -6.11 31,430 -26.38 0.1545
2026-01-28 2025-12-31 13F WATERS COMMON STOCK 941848103 112,407 -9,977 -8.15 42,696 16.36 0.3222
2025-10-17 2025-09-30 13F WATERS COMMON STOCK 941848103 122,384 -171,941 -58.42 36,692 -64.28 0.2692
2025-07-28 2025-06-30 13F WATERS COMMON STOCK 941848103 294,325 6,525 2.27 102,731 -3.15 0.7327
2025-04-21 2025-03-31 13F WATERS COMMON STOCK 941848103 287,800 -129,767 -31.08 106,074 -31.52 0.7750
2025-01-24 2024-12-31 13F WATERS COMMON STOCK 941848103 417,567 -54,352 -11.52 154,909 -8.79 1.0870
2024-10-24 2024-09-30 13F WATERS COMMON STOCK 941848103 471,919 -66,093 -12.28 169,839 8.81 1.1815
2024-07-19 2024-06-30 13F WATERS COMMON STOCK 941848103 538,012 -9,127 -1.67 156,088 -17.12 1.1577
2024-04-22 2024-03-31 13F WATERS COMMON STOCK 941848103 547,139 -34,909 -6.00 188,342 -1.71 1.3435
2024-01-24 2023-12-31 13F WATERS COMMON STOCK 941848103 582,048 10,550 1.85 191,628 22.28 1.4457
2023-10-18 2023-09-30 13F WATERS COMMON STOCK 941848103 571,498 41,514 7.83 156,710 10.94 1.3133
2023-07-24 2023-06-30 13F WATERS COMMON STOCK 941848103 529,984 131,883 33.13 141,262 14.60 1.1586
2023-04-19 2023-03-31 13F WATERS COMMON STOCK 941848103 398,101 -6,245 -1.54 123,264 -11.01 1.0639
2023-01-20 2022-12-31 13F WATERS COMMON STOCK 941848103 404,346 12,347 3.15 138,521 31.11 1.2180
2022-10-19 2022-09-30 13F WATERS COMMON STOCK 941848103 391,999 -9,102 -2.27 105,655 -20.41 1.0467
2022-07-22 2022-06-30 13F WATERS COMMON STOCK 941848103 401,101 11,794 3.03 132,757 9.86 1.2545
2022-04-20 2022-03-31 13F WATERS COMMON STOCK 941848103 389,307 75,680 24.13 120,837 3.41 0.9981
2022-01-21 2021-12-31 13F WATERS COMMON STOCK 941848103 313,627 -2,091 -0.66 116,857 3.59 0.9383
2021-10-25 2021-09-30 13F WATERS COMMON STOCK 941848103 315,718 -22,482 -6.65 112,806 -3.49 0.9989
2021-07-22 2021-06-30 13F WATERS COMMON STOCK 941848103 338,200 -48,745 -12.60 116,885 6.30 1.0392
2021-04-21 2021-03-31 13F WATERS COMMON STOCK 941848103 386,945 19,825 5.40 109,958 21.06 1.0648
2021-01-15 2020-12-31 13F WATERS COMMON STOCK 941848103 367,120 21,922 6.35 90,833 34.47 0.9690
2020-10-14 2020-09-30 13F WATERS COMMON STOCK 941848103 345,198 48,827 16.47 67,548 26.34 0.8413
2020-07-23 2020-06-30 13F WATERS COMMON STOCK 941848103 296,371 12,335 4.34 53,465 3.40 0.7219
2020-04-24 2020-03-31 13F/A-1 WATERS COMMON STOCK 941848103 284,036 -3,513 -1.22 51,709 -23.03 0.8241
2020-04-21 2020-03-31 13F WATERS COMMON STOCK 941848103 284,036 -3,513 51,709 458,519.3767
2020-01-10 2019-12-31 13F WATERS COMMON STOCK 941848103 287,549 -2,373 -0.82 67,185 3.81 0.7820
2019-10-21 2019-09-30 13F WATERS COMMON STOCK 941848103 289,922 17,849 6.56 64,720 10.52 0.8136
2019-07-25 2019-06-30 13F WATERS COMMON STOCK 941848103 272,073 34,564 14.55 58,561 -2.04 0.7620
2019-04-16 2019-03-31 13F WATERS COMMON STOCK 941848103 237,509 -52,009 -17.96 59,783 9.46 0.8139
2019-01-17 2018-12-31 13F WATERS COMMON STOCK 941848103 289,518 7,775 2.76 54,618 -0.42 0.8690
2018-10-23 2018-09-30 13F WATERS COMMON STOCK 941848103 281,743 22,434 8.65 54,850 9.27 0.7556
2018-07-25 2018-06-30 13F WATERS COMMON STOCK 941848103 259,309 160 0.06 50,199 -2.49 0.7366
2018-04-13 2018-03-31 13F WATERS COMMON STOCK 941848103 259,149 -5,258 -1.99 51,480 0.78 0.7811
2018-01-29 2017-12-31 13F WATERS COMMON STOCK 941848103 264,407 -989 -0.37 51,081 7.21 0.7488
2017-10-13 2017-09-30 13F WATERS COMMON STOCK 941848103 265,396 -10,524 -3.81 47,644 -6.07 0.7419
2017-07-19 2017-06-30 13F WATERS COMMON STOCK 941848103 275,920 1,561 0.57 50,725 18.28 0.8151
2017-04-24 2017-03-31 13F WATERS COMMON STOCK 941848103 274,359 15,856 6.13 42,885 23.45 0.6683
2017-02-07 2016-12-31 13F/A-1 WATERS COMMON STOCK 941848103 258,503 41,484 19.12 34,740 1.00 0.5477
2017-02-01 2016-12-31 13F WATERS COMMON STOCK 941848103 258,503 34,740
2016-10-17 2016-09-30 13F WATERS COMMON STOCK 941848103 217,019 -4,109 -1.86 34,396 10.59 0.5671
2016-08-09 2016-06-30 13F WATERS COMMON STOCK 941848103 221,128 2,650 1.21 31,102 7.91 0.5312
2016-04-19 2016-03-31 13F WATERS COMMON STOCK 941848103 218,478 -1,360 -0.62 28,822 -2.58 0.5018
2016-01-21 2015-12-31 13F WATERS COMMON STOCK 941848103 219,838 -6,290 -2.78 29,586 10.68 0.5488
2015-10-29 2015-09-30 13F WATERS COMMON STOCK 941848103 226,128 1,011 0.45 26,730 -7.51 0.4465
2015-07-17 2015-06-30 13F WATERS COMMON STOCK 941848103 225,117 -7,415 -3.19 28,900 -0.03 0.4407
2015-04-15 2015-03-31 13F WATERS COMMON STOCK 941848103 232,532 232,532 0.00 28,909 0.4291
2015-01-28 2014-12-31 13F WATERS COMMON STOCK 941848103 0 -235,152 -100.00 0 -100.00
2014-10-23 2014-09-30 13F WATERS COMMON STOCK 941848103 235,152 675 0.29 23,308 -4.82 0.3600
2014-08-01 2014-06-30 13F WATERS COMMON STOCK 941848103 234,477 -6,530 -2.71 24,488 -6.27 0.3559
2014-04-11 2014-03-31 13F WATERS COMMON STOCK 941848103 241,007 7,095 3.03 26,127 11.70 0.3881
2014-02-11 2013-12-31 13F WATERS COMMON STOCK 941848103 233,912 -699 -0.30 23,391 -6.13 0.3412
2013-11-15 2013-09-30 13F WATERS COMMON STOCK 941848103 234,611 -7,315 -3.02 24,918 2.95 0.3813
2013-08-08 2013-06-30 13F WATERS COMMON STOCK 941848103 241,926 241,926 24,205 0.3908
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.