Waters Corporation
MX ˙ BMV ˙ US9418481035
SecurityMX:WAT / Waters Corporation
InstitutionParthenon Llc
Latest Disclosed Ownership29,003 shares
Latest Disclosed Value $ 8,637,093
Parthenon Llc reports 0.33% decrease in ownership of WAT / Waters Corporation

On April 28, 2026 - Parthenon Llc filed a 13F-HR form disclosing ownership of 29,003 shares of Waters Corporation (MX:WAT) valued at $8,637,093 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 23, 2026 disclosing 29,098 shares of Waters Corporation. This represents a change in shares of -0.33% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-04-28 2026-03-31 13F WATERS COM 941848103 29,003 -95 -0.33 8,637 -21.85 0.9874
2026-01-23 2025-12-31 13F WATERS COM 941848103 29,098 -1,163 -3.84 11,052 21.83 1.1926
2025-10-31 2025-09-30 13F WATERS COM 941848103 30,261 -1,470 -4.63 9,073 -18.09 1.0053
2025-07-29 2025-06-30 13F WATERS COM 941848103 31,731 -855 -2.62 11,075 -7.79 1.2670
2025-05-02 2025-03-31 13F WATERS COM 941848103 32,586 -295 -0.90 12,010 -1.54 1.4770
2025-02-03 2024-12-31 13F WATERS COM 941848103 32,881 700 2.18 12,198 5.33 1.4755
2024-11-05 2024-09-30 13F WATERS COM 941848103 32,181 -75 -0.23 11,582 23.76 1.3831
2024-08-08 2024-06-30 13F WATERS COM 941848103 32,256 -590 -1.80 9,358 -17.23 1.1887
2024-04-30 2024-03-31 13F WATERS COM 941848103 32,846 -500 -1.50 11,307 2.99 1.4334
2024-02-05 2023-12-31 13F WATERS COM 941848103 33,346 -150 -0.45 10,979 19.53 1.5177
2023-10-30 2023-09-30 13F WATERS COM 941848103 33,496 -320 -0.95 9,185 1.90 1.3781
2023-07-27 2023-06-30 13F WATERS COM 941848103 33,816 0 0.00 9,013 -13.92 1.3020
2023-05-08 2023-03-31 13F WATERS COM 941848103 33,816 -150 -0.44 10,470 -10.02 1.6024
2023-02-08 2022-12-31 13F WATERS COM 941848103 33,966 -250 -0.73 11,636 26.18 1.9087
2022-11-01 2022-09-30 13F WATERS COM 941848103 34,216 0 0.00 9,222 -18.57 1.6644
2022-07-29 2022-06-30 13F WATERS COM 941848103 34,216 -562 -1.62 11,325 4.91 1.9204
2022-05-09 2022-03-31 13F WATERS COM 941848103 34,778 -20 -0.06 10,795 -16.74 1.5648
2022-02-07 2021-12-31 13F WATERS COM 941848103 34,798 -3,670 -9.54 12,966 -5.67 1.8187
2021-10-28 2021-09-30 13F WATERS COM 941848103 38,468 -5,998 -13.49 13,745 -10.56 2.0654
2021-07-28 2021-06-30 13F WATERS COM 941848103 44,466 -15 -0.03 15,368 21.58 2.3024
2021-04-23 2021-03-31 13F WATERS COM 941848103 44,481 435 0.99 12,640 15.98 2.0327
2021-02-03 2020-12-31 13F WATERS COM 941848103 44,046 -732 -1.63 10,898 24.38 1.8794
2020-10-29 2020-09-30 13F WATERS COM 941848103 44,778 -255 -0.57 8,762 7.85 1.6997
2020-07-24 2020-06-30 13F WATERS COM 941848103 45,033 -5 -0.01 8,124 -0.91 1.6867
2020-04-28 2020-03-31 13F WATERS COM 941848103 45,038 -1,395 -3.00 8,199 -24.43 1.9511
2020-01-28 2019-12-31 13F WATERS COM 941848103 46,433 -370 -0.79 10,849 3.84 2.1656
2019-10-31 2019-09-30 13F WATERS COM 941848103 46,803 -900 -1.89 10,448 1.75 2.2347
2019-07-29 2019-06-30 13F WATERS COM 941848103 47,703 -185 -0.39 10,268 -14.82 2.2021
2019-05-03 2019-03-31 13F WATERS COM 941848103 47,888 -300 -0.62 12,054 32.59 2.6947
2019-01-29 2018-12-31 13F WATERS COM 941848103 48,188 150 0.31 9,091 -2.79 2.2384
2018-11-14 2018-09-30 13F WATERS COM 941848103 48,038 -1,000 -2.04 9,352 -1.49 2.0551
2018-08-02 2018-06-30 13F WATERS COM 941848103 49,038 680 1.41 9,493 -1.18 2.1893
2018-05-03 2018-03-31 13F WATERS COM 941848103 48,358 0 0.00 9,606 2.83 2.2627
2018-02-05 2017-12-31 13F WATERS COM 941848103 48,358 33 0.07 9,342 7.69 2.1053
2017-10-31 2017-09-30 13F WATERS COM 941848103 48,325 -1,425 -2.86 8,675 -5.15 2.0477
2017-07-21 2017-06-30 13F WATERS COM 941848103 49,750 0 0.00 9,146 17.62 2.1754
2017-05-05 2017-03-31 13F WATERS COM 941848103 49,750 -3,726 -6.97 7,776 8.20 1.8453
2017-02-01 2016-12-31 13F WATERS COM 941848103 53,476 -275 -0.51 7,187 -15.64 1.7657
2016-11-07 2016-09-30 13F WATERS COM 941848103 53,751 -325 -0.60 8,519 12.00 2.1145
2016-07-26 2016-06-30 13F WATERS COM 941848103 54,076 -535 -0.98 7,606 5.58 1.9086
2016-05-16 2016-03-31 13F WATERS COM 941848103 54,611 -80 -0.15 7,204 -2.12 1.8501
2016-02-03 2015-12-31 13F WATERS COM 941848103 54,691 -1,130 -2.02 7,360 11.53 1.9240
2015-10-29 2015-09-30 13F WATERS COM 941848103 55,821 -510 -0.91 6,599 -8.75 1.8413
2015-07-24 2015-06-30 13F WATERS COM 941848103 56,331 -1,630 -2.81 7,232 0.36 1.9088
2015-04-28 2015-03-31 13F WATERS COM 941848103 57,961 920 1.61 7,206 12.07 1.9129
2015-02-17 2014-12-31 13F WATERS COM 941848103 57,041 75 0.13 6,430 13.89 1.7730
2014-10-23 2014-09-30 13F WATERS COM 941848103 56,966 -25 -0.04 5,646 -5.14 1.6309
2014-07-28 2014-06-30 13F WATERS COM 941848103 56,991 600 1.06 5,952 -2.63 1.7591
2014-04-18 2014-03-31 13F WATERS COM 941848103 56,391 -1,400 -2.42 6,113 5.78 1.8392
2014-02-21 2013-12-31 13F WATERS COM 941848103 57,791 109 0.19 5,779 -5.66 1.7634
2013-10-17 2013-09-30 13F WATERS COM 941848103 57,682 -300 -0.52 6,126 5.60 2.0293
2013-07-22 2013-06-30 13F WATERS COM 941848103 57,982 57,982 5,801 1.9470
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.