Waters Corporation
MX ˙ BMV ˙ US9418481035
SecurityMX:WAT / Waters Corporation
InstitutionGrandfield & Dodd, Llc
Latest Disclosed Ownership1,834 shares
Latest Disclosed Value $ 546,165
Grandfield & Dodd, Llc reports 16.00% increase in ownership of WAT / Waters Corporation

On May 7, 2026 - Grandfield & Dodd, Llc filed a 13F-HR form disclosing ownership of 1,834 shares of Waters Corporation (MX:WAT) valued at $546,165 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 1,581 shares of Waters Corporation. This represents a change in shares of 16.00% 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)
2026-05-07 2026-03-31 13F WATERS COM 941848103 1,834 253 16.00 546 -9.00 0.0308
2026-02-10 2025-12-31 13F WATERS COM 941848103 1,581 0 0.00 601 26.58 0.0340
2025-10-30 2025-09-30 13F WATERS COM 941848103 1,581 -714 -31.11 474 -40.82 0.0269
2025-08-08 2025-06-30 13F WATERS COM 941848103 2,295 0 0.00 801 -5.21 0.0469
2025-05-02 2025-03-31 13F WATERS COM 941848103 2,295 -615 -21.13 846 -21.69 0.0524
2025-02-06 2024-12-31 13F WATERS COM 941848103 2,910 0 0.00 1,080 3.06 0.0666
2024-11-08 2024-09-30 13F WATERS COM 941848103 2,910 0 0.00 1,047 24.05 0.0621
2024-08-09 2024-06-30 13F WATERS COM 941848103 2,910 0 0.00 844 -15.68 0.0534
2024-05-06 2024-03-31 13F WATERS COM 941848103 2,910 0 0.00 1,002 4.49 0.0632
2024-01-31 2023-12-31 13F WATERS COM 941848103 2,910 0 0.00 958 20.20 0.0662
2023-10-26 2023-09-30 13F WATERS COM 941848103 2,910 0 0.00 798 2.84 0.0586
2023-08-08 2023-06-30 13F WATERS COM 941848103 2,910 0 0.00 776 -13.98 0.0542
2023-04-28 2023-03-31 13F WATERS COM 941848103 2,910 0 0.00 901 -9.54 0.0630
2023-01-20 2022-12-31 13F WATERS COM 941848103 2,910 0 0.00 997 27.69 0.0729
2022-11-04 2022-09-30 13F WATERS COM 941848103 2,910 0 0.00 780 -18.75 0.0637
2022-08-01 2022-06-30 13F WATERS COM 941848103 2,910 0 0.00 960 6.67 0.0756
2022-04-19 2022-03-31 13F WATERS COM 941848103 2,910 0 0.00 900 -16.67 0.0611
2022-02-08 2021-12-31 13F WATERS COM 941848103 2,910 0 0.00 1,080 3.85 0.0695
2021-10-28 2021-09-30 13F WATERS COM 941848103 2,910 0 0.00 1,040 2.97 0.0726
2021-07-28 2021-06-30 13F WATERS COM 941848103 2,910 0 0.00 1,010 21.69 0.0699
2021-04-22 2021-03-31 13F WATERS COM 941848103 2,910 510 21.25 830 40.68 0.0621
2021-01-29 2020-12-31 13F WATERS COM 941848103 2,400 0 0.00 590 25.53 0.0463
2020-11-03 2020-09-30 13F WATERS COM 941848103 2,400 0 0.00 470 9.30 0.0423
2020-07-24 2020-06-30 13F WATERS COM 941848103 2,400 0 0.00 430 -1.60 0.0416
2020-05-14 2020-03-31 13F WATERS COM 941848103 2,400 0 0.00 437 -22.10 0.0515
2020-02-07 2019-12-31 13F WATERS COM 941848103 2,400 0 0.00 561 4.66 0.0511
2019-10-30 2019-09-30 13F WATERS COM 941848103 2,400 0 0.00 536 3.68 0.0527
2019-07-29 2019-06-30 13F WATERS COM 941848103 2,400 0 0.00 517 -14.40 0.0511
2019-04-26 2019-03-31 13F WATERS COM 941848103 2,400 0 0.00 604 33.33 0.0629
2019-02-12 2018-12-31 13F WATERS COM 941848103 2,400 0 0.00 453 -3.00 0.0536
2018-11-02 2018-09-30 13F WATERS COM 941848103 2,400 0 0.00 467 0.43 0.0481
2018-07-27 2018-06-30 13F WATERS COM 941848103 2,400 0 0.00 465 -2.52 0.0511
2018-05-04 2018-03-31 13F/A-1 WATERS COM 941848103 2,400 0 0.00 477 2.80 0.0532
2018-05-04 2018-03-31 13F WATERS COM 941848103 2,400 0 477
2018-02-05 2017-12-31 13F WATERS COM 941848103 2,400 0 0.00 464 7.66 0.0495
2017-11-03 2017-09-30 13F WATERS COM 941848103 2,400 0 0.00 431 -2.27 0.0484
2017-07-27 2017-06-30 13F WATERS COM 941848103 2,400 615 34.45 441 58.06 0.0521
2017-04-28 2017-03-31 13F WATERS COM 941848103 1,785 0 0.00 279 16.25 0.0345
2017-02-02 2016-12-31 13F WATERS COM 941848103 1,785 0 0.00 240 -15.19 0.0311
2016-10-24 2016-09-30 13F WATERS COM 941848103 1,785 1,785 283 0.0372
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.