Position in WAT
as of Mar 31, 2026
· filed May 14, 2026
Position Value
$44,270,948
+$25,516,842 QoQ
Shares Held
148,660
+201.1% QoQ
Ownership
0.151%
of shares outstanding
% of Portfolio
0.02%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
20 quarters on record
Voting authority
Sole 86.21283465626261.ToString("F0")%
Shared 0.ToString("F0")%
None 13.787165343737387.ToString("F0")%
Common Shares in WAT Over Time
Shares Held
Position Value (USD)
Position in Diagnostics & Research
Healthcare · as of Mar 31, 2026ARROWSTREET CAPITAL, LIMITED PARTNERSHIP holds $2,675,072,774 across 18 Diagnostics & Research names. WAT ranks #11 (1.7% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | DHR |
Danaher Corp /De/
|
3,639,630 | $690,073,848 | |
| 2 | IDXX |
Idexx Laboratories Inc /De
|
838,839 | $471,335,245 | |
| 3 | TMO |
Thermo Fisher Scientific Inc.
|
634,369 | $311,811,394 | |
| 4 | NTRA |
Natera, Inc.
|
1,191,732 | $238,334,482 | |
| 5 | MEDP |
Medpace Holdings, Inc.
|
395,769 | $190,044,316 | |
| 6 | MTD |
Mettler Toledo International Inc/
|
134,906 | $170,143,447 | |
| 7 | IQV |
Iqvia Holdings Inc.
|
992,190 | $169,208,082 | |
| 8 | A |
Agilent Technologies, Inc.
|
1,439,782 | $164,106,352 |
All Filings in WAT
Export CSV
20 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $44,270,948 | 148,660 | Shares | Defined | 2026-05-14 | |
| 2025-12-31 | $18,754,106 | 49,375 | Shares | Defined | 2026-02-13 | |
| 2025-09-30 | $5,662,211 | 18,886 | Shares | Defined | 2025-11-13 | |
| 2025-06-30 | $3,114,483 | 8,923 | Shares | Defined | 2025-08-13 | |
| 2024-12-31 | $2,455,516 | 6,619 | Shares | Defined | 2025-02-12 | |
| 2024-09-30 | $3,443,787 | 9,569 | Shares | Defined | 2024-11-14 | |
| 2023-06-30 | $16,683,005 | 62,591 | Shares | Defined | 2023-08-14 | |
| 2023-03-31 | $120,951,695 | 390,633 | Shares | Defined | 2023-05-15 | |
| 2022-12-31 | $118,230,867 | 345,119 | Shares | Defined | 2023-02-14 | |
| 2022-09-30 | $83,959,942 | 311,505 | Shares | Defined | 2022-11-14 | |
| 2022-06-30 | $104,744,578 | 316,468 | Shares | Defined | 2022-08-15 | |
| 2022-03-31 | $175,239,055 | 564,577 | Shares | Defined | 2022-05-13 | |
| 2021-12-31 | $314,580,218 | 844,284 | Shares | Defined | 2022-02-14 | |
| 2021-09-30 | $331,863,098 | 928,808 | Shares | Defined | 2021-11-12 | |
| 2021-06-30 | $274,588,527 | 794,504 | Shares | Defined | 2021-08-13 | |
| 2021-03-31 | $123,853,505 | 435,843 | Shares | Defined | 2021-05-14 | |
| 2020-12-31 | $82,831,762 | 334,782 | Shares | Defined | 2021-02-12 | |
| 2020-09-30 | $63,972,684 | 326,925 | Shares | Defined | 2020-11-12 | |
| 2020-06-30 | $22,652,828 | 125,570 | Shares | Defined | 2020-08-12 | |
| 2020-03-31 | $7,276,538 | 39,970 | Shares | Defined | 2020-05-15 | |
| No filing history on record for this holder in this stock. | ||||||