Waters Corporation
MX ˙ BMV ˙ US9418481035
SecurityMX:WAT / Waters Corporation
InstitutionRhumbline Advisers
Latest Disclosed Ownership178,037 shares
Latest Disclosed Value $ 53,019,366
Rhumbline Advisers reports 54.57% increase in ownership of WAT / Waters Corporation

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 178,037 shares of Waters Corporation (MX:WAT) valued at $53,019,366 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 115,185 shares of Waters Corporation. This represents a change in shares of 54.57% 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)
2026-05-12 2026-03-31 13F WATERS CORP COM COM 941848103 178,037 62,852 54.57 53,019 21.19 0.0454
2026-02-13 2025-12-31 13F WATERS CORP COM COM 941848103 115,185 -17,610 -13.26 43,751 9.89 0.0354
2025-11-06 2025-09-30 13F WATERS CORP COM COM 941848103 132,795 7,636 6.10 39,813 -8.86 0.0320
2025-08-12 2025-06-30 13F WATERS CORP COM COM 941848103 125,159 -359 -0.29 43,685 -5.57 0.0374
2025-05-29 2025-03-31 13F/A-1 WATERS CORP COM COM 941848103 125,518 9,365 8.06 46,262 7.36 0.0433
2025-04-08 2025-03-31 13F WATERS CORP COM COM 941848103 125,518 9,365 46,262 0.0433
2025-05-29 2024-12-31 13F/A-1 WATERS CORP COM COM 941848103 116,153 -3,416 -2.86 43,090 0.14 0.0385
2025-01-30 2024-12-31 13F WATERS CORP COM COM 941848103 116,153 -3,416 43,090 0.0385
2024-11-12 2024-09-30 13F WATERS CORP COM COM 941848103 119,569 -242 -0.20 43,032 23.80 0.0388
2024-08-01 2024-06-30 13F WATERS CORP COM COM 941848103 119,811 -5,745 -4.58 34,759 -19.58 0.0327
2024-05-09 2024-03-31 13F WATERS CORP COM COM 941848103 125,556 -171 -0.14 43,220 4.42 0.0415
2024-02-08 2023-12-31 13F WATERS CORP COM COM 941848103 125,727 -52,219 -29.35 41,393 -15.17 0.0434
2023-11-09 2023-09-30 13F WATERS CORP COM COM 941848103 177,946 4,506 2.60 48,794 5.55 0.0566
2023-08-08 2023-06-30 13F WATERS CORP COM COM 941848103 173,440 674 0.39 46,229 87,122.64 0.0518
2023-05-11 2023-03-31 13F WATERS CORP COM COM 941848103 172,766 7,254 4.38 53 -99.91 0.0660
2023-02-14 2022-12-31 13F WATERS CORP COM COM 941848103 165,512 3,277 2.02 56,701 29.67 0.0762
2022-11-10 2022-09-30 13F WATERS CORP COM COM 941848103 162,235 -126 -0.08 43,727 -18.63 0.0651
2022-08-11 2022-06-30 13F WATERS CORP COM COM 941848103 162,361 -136 -0.08 53,738 6.54 0.0784
2022-05-12 2022-03-31 13F WATERS CORP COM COM 941848103 162,497 4,691 2.97 50,437 -14.22 0.0649
2022-02-10 2021-12-31 13F WATERS CORP COM COM 941848103 157,806 3,054 1.97 58,799 6.34 0.0721
2021-11-12 2021-09-30 13F WATERS CORP COM COM 941848103 154,752 4,221 2.80 55,293 6.28 0.0748
2021-08-05 2021-06-30 13F WATERS CORP COM COM 941848103 150,531 -9,761 -6.09 52,025 14.22 0.0683
2021-05-06 2021-03-31 13F WATERS CORP COM COM 941848103 160,292 -8,994 -5.31 45,550 8.75 0.0619
2021-02-10 2020-12-31 13F WATERS CORP COM COM 941848103 169,286 -4,077 -2.35 41,885 23.47 0.0578
2020-11-12 2020-09-30 13F WATERS CORP COM COM 941848103 173,363 -630 -0.36 33,924 8.08 0.0532
2020-08-13 2020-06-30 13F WATERS CORP COM COM 941848103 173,993 -10,506 -5.69 31,388 -6.55 0.0524
2020-05-06 2020-03-31 13F WATERS CORP COM COM 941848103 184,499 8,311 4.72 33,588 -18.41 0.0704
2020-02-05 2019-12-31 13F WATERS CORP COM COM 941848103 176,188 7,942 4.72 41,166 9.61 0.0688
2019-10-23 2019-09-30 13F WATERS CORP COM COM 941848103 168,246 4,969 3.04 37,558 6.87 0.0686
2019-08-14 2019-06-30 13F WATERS CORP COM COM 941848103 163,277 -8,376 -4.88 35,144 -18.66 0.0660
2019-05-01 2019-03-31 13F WATERS CORP COM COM 941848103 171,653 -18,238 -9.60 43,207 20.61 0.0837
2019-01-31 2018-12-31 13F WATERS CORP COM COM 941848103 189,891 -2,005 -1.04 35,823 -4.11 0.0779
2018-11-07 2018-09-30 13F WATERS CORP COM COM 941848103 191,896 1,910 1.01 37,358 1.57 0.0722
2018-08-06 2018-06-30 13F WATERS CORP COM COM 941848103 189,986 3,091 1.65 36,779 -0.94 0.0742
2018-05-02 2018-03-31 13F WATERS CORP COM COM 941848103 186,895 -8,889 -4.54 37,127 -1.84 0.0775
2018-02-09 2017-12-31 13F WATERS CORP COM COM 941848103 195,784 5,471 2.87 37,824 10.71 0.0768
2017-11-06 2017-09-30 13F WATERS CORP COM COM 941848103 190,313 -1,686 -0.88 34,165 -3.21 0.0743
2017-08-02 2017-06-30 13F WATERS CORP COM COM 941848103 191,999 -6,221 -3.14 35,297 13.92 0.0806
2017-05-02 2017-03-31 13F WATERS CORP COM COM 941848103 198,220 6,849 3.58 30,984 20.48 0.0724
2017-01-27 2016-12-31 13F WATERS CORP COM COM 941848103 191,371 15,717 8.95 25,718 -7.62 0.0652
2016-11-08 2016-09-30 13F WATERS CORP COM COM 941848103 175,654 7,588 4.51 27,839 17.77 0.0767
2016-08-11 2016-06-30 13F WATERS CORP COM COM 941848103 168,066 5,196 3.19 23,638 10.02 0.0700
2016-05-02 2016-03-31 13F WATERS CORP USD.0 COM 941848103 162,870 3,155 1.98 21,486 -0.04 0.0667
2016-02-03 2015-12-31 13F WATERS CORP USD.0 COM 941848103 159,715 3,619 2.32 21,494 16.49 0.0692
2015-11-04 2015-09-30 13F WATERS CORP USD.0 COM 941848103 156,096 1,055 0.68 18,452 -7.30 0.0628
2015-08-04 2015-06-30 13F WATERS CORP USD.0 COM 941848103 155,041 -2,417 -1.54 19,904 1.68 0.0634
2015-05-12 2015-03-31 13F WATERS CORP USD.0 COM 941848103 157,458 -2,350 -1.47 19,575 8.67 0.0565
2015-02-06 2014-12-31 13F WATERS CORP USD.0 COM 941848103 159,808 -7,750 -4.63 18,014 8.47 0.0523
2014-11-12 2014-09-30 13F WATERS CORP USD.0 COM 941848103 167,558 6,286 3.90 16,608 -1.40 0.0499
2014-08-06 2014-06-30 13F WATERS CORP USD.0 COM 941848103 161,272 3,281 2.08 16,843 -1.66 0.0494
2014-05-06 2014-03-31 13F WATERS CORP USD.0 COM 941848103 157,991 568 0.36 17,128 8.80 0.0508
2014-02-03 2013-12-31 13F WATERS CORP USD.0 COM 941848103 157,423 -15,390 -8.91 15,742 -14.23 0.0464
2013-11-05 2013-09-30 13F WATERS CORP USD.0 COM 941848103 172,813 -3,022 -1.72 18,354 4.33 0.0569
2013-08-07 2013-06-30 13F WATERS CORP USD.0 COM 941848103 175,835 175,835 17,592 0.0565
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.