Waters Corporation
MX ˙ BMV ˙ US9418481035
SecurityMX:WAT / Waters Corporation
InstitutionMarshall Wace, Llp
Latest Disclosed Ownership226,886 shares
Latest Disclosed Value $ 67,566,650
Marshall Wace, Llp reports 60.95% decrease in ownership of WAT / Waters Corporation

On May 14, 2026 - Marshall Wace, Llp filed a 13F-HR form disclosing ownership of 226,886 shares of Waters Corporation (MX:WAT) valued at $67,566,650 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 581,063 shares of Waters Corporation. This represents a change in shares of -60.95% 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)
2026-05-14 2026-03-31 13F WATERS COMMON STOCK 941848103 226,886 -354,177 -60.95 67,567 -69.39 0.0319
2026-02-13 2025-12-31 13F WATERS COMMON STOCK 941848103 581,063 547,109 1,611.32 220,705 2,068.24 0.2009
2025-11-13 2025-09-30 13F WATERS COMMON STOCK 941848103 33,954 -254,057 -88.21 10,180 -89.87 0.0103
2025-08-13 2025-06-30 13F WATERS COMMON STOCK 941848103 288,011 -62,248 -17.77 100,527 -22.13 0.1132
2025-05-15 2025-03-31 13F WATERS COMMON STOCK 941848103 350,259 47,183 15.57 129,095 14.82 0.1639
2025-02-13 2024-12-31 13F WATERS COMMON STOCK 941848103 303,076 246,738 437.96 112,435 454.55 0.1352
2024-11-14 2024-09-30 13F WATERS COMMON STOCK 941848103 56,338 24,299 75.84 20,275 118.13 0.0247
2024-08-14 2024-06-30 13F WATERS COMMON STOCK 941848103 32,039 32,039 9,295 0.0124
2023-08-14 2023-06-30 13F WATERS COMMON STOCK 941848103 0 -23,426 -100.00 0 -100.00
2023-05-15 2023-03-31 13F WATERS COMMON STOCK 941848103 23,426 -15,990 -40.57 7,253 -46.29 0.0154
2023-02-14 2022-12-31 13F WATERS COMMON STOCK 941848103 39,416 -10,432 -20.93 13,503 0.51 0.0304
2022-11-14 2022-09-30 13F WATERS COMMON STOCK 941848103 49,848 39,473 380.46 13,435 291.23 0.0294
2022-08-15 2022-06-30 13F WATERS COMMON STOCK 941848103 10,375 5,812 127.37 3,434 142.34 0.0071
2022-05-16 2022-03-31 13F WATERS COMMON STOCK 941848103 4,563 -2,528 -35.65 1,417 -46.39 0.0027
2022-02-14 2021-12-31 13F WATERS COMMON STOCK 941848103 7,091 4,208 145.96 2,643 156.60 0.0049
2021-11-15 2021-09-30 13F WATERS COMMON STOCK 941848103 2,883 -2,207 -43.36 1,030 -41.44 0.0043
2021-08-13 2021-06-30 13F WATERS COMMON STOCK 941848103 5,090 2,928 135.43 1,759 186.02 0.0086
2021-05-17 2021-03-31 13F WATERS COMMON STOCK 941848103 2,162 -40,917 -94.98 615 -94.23 0.0028
2021-02-16 2020-12-31 13F WATERS COMMON STOCK 941848103 43,079 -117,792 -73.22 10,658 -66.14 0.0578
2020-11-16 2020-09-30 13F WATERS COMMON STOCK 941848103 160,871 153,219 2,002.34 31,479 2,179.44 0.2015
2020-08-13 2020-06-30 13F WATERS COMMON STOCK 941848103 7,652 7,470 4,104.40 1,381 4,084.85 0.0097
2020-05-15 2020-03-31 13F WATERS COMMON STOCK 941848103 182 182 -97.62 33 -97.61 0.0003
2019-08-14 2019-06-30 13F WATERS COMMON STOCK 941848103 0 -229 -100.00 0 -100.00
2019-05-29 2019-03-31 13F/A-1 WATERS COMMON STOCK 941848103 229 -45,871 -99.50 57 -99.34 0.0005
2019-05-14 2019-03-31 13F WATERS COMMON STOCK 941848103 229 -45,871 57
2019-02-14 2018-12-31 13F WATERS COMMON STOCK 941848103 46,100 19,757 75.00 8,697 69.60 0.0888
2018-12-06 2018-09-30 13F/A-1 WATERS COMMON STOCK 941848103 26,343 25,111 2,038.23 5,128 2,045.61 0.0436
2018-11-14 2018-09-30 13F WATERS COMMON STOCK 941848103 26,343 25,111 5,128
2018-08-14 2018-06-30 13F WATERS COMMON STOCK 941848103 1,232 1,232 -95.32 239 -95.34 0.0036
2017-05-12 2017-03-31 13F WATERS COMMON STOCK 941848103 0 -227,465 -100.00 0 -100.00
2017-02-10 2016-12-31 13F WATERS COMMON STOCK 941848103 227,465 98,031 75.74 30,569 49.02 0.2010
2016-11-10 2016-09-30 13F WATERS COMMON STOCK 941848103 129,434 56,939 78.54 20,514 101.20 0.1458
2016-08-12 2016-06-30 13F WATERS COMMON STOCK 941848103 72,495 23,443 47.79 10,196 57.56 0.0857
2016-05-13 2016-03-31 13F WATERS COMMON STOCK 941848103 49,052 -6,990 -12.47 6,471 -14.20 0.0624
2016-02-10 2015-12-31 13F WATERS COMMON STOCK 941848103 56,042 56,042 14.25 7,542 16.55 0.0708
2015-11-12 2015-09-30 13F WATERS COMMON STOCK 941848103 0 -43,803 -100.00 0 -100.00
2015-08-14 2015-06-30 13F WATERS COMMON STOCK 941848103 43,803 43,803 0.00 5,623 0.0733
2015-02-17 2014-12-31 13F WATERS COMMON STOCK 941848103 0 -1,937 -100.00 0 -100.00
2014-11-13 2014-09-30 13F WATERS COMMON STOCK 941848103 1,937 -118,322 -98.39 192 -98.47 0.0028
2014-08-14 2014-06-30 13F WATERS COMMON STOCK 941848103 120,259 117,159 3,779.32 12,560 3,638.10 0.1849
2014-05-14 2014-03-31 13F WATERS COMMON STOCK 941848103 3,100 3,100 336 0.0061
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.