Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
1,136 institutional managers reported holding WAT for the quarter ended Mar 31, 2026. Together they hold about 46% of shares outstanding; the top 10 hold 23%. 442 opened new positions; 96 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 12.13M | 6.01% | $3.61B | added +62.3% | ≤2013 |
| BlackRock | 8.54M | 4.23% | $2.54B | added +57.3% | ≤2013 |
| T. Rowe Price Investment Management, INC. | 4.66M | 2.31% | $1.39B | added +3768.3% | 2025 Q3 |
| MFS Investment Management | 4.63M | 2.29% | $1.38B | added +76.4% | ≤2013 |
| State Street | 4.36M | 2.16% | $1.30B | added +62.6% | ≤2013 |
| Fundsmith (focused) | 3.21M | 1.59% | $956.8M | trimmed -9.7% | 2015 Q1 |
| Geode Capital | 2.65M | 1.31% | $788.3M | added +66.1% | ≤2013 |
| Invesco | 2.17M | 1.07% | $645.9M | added +85.8% | ≤2013 |
| AllianceBernstein | 2.12M | 1.05% | $630.5M | added +2.4% | ≤2013 |
| Janus Henderson | 1.64M | 0.81% | $488.1M | added +27% | ≤2013 |
| First Eagle Investment Management | 1.58M | 0.78% | $469.2M | opened | 2026 Q1 |
| UBS | 1.43M | 0.71% | $427.4M | added +68.8% | ≤2013 |
| Mawer Investment Management LTD. | 1.40M | 0.69% | $418.1M | added +8.1% | 2016 Q1 |
| Viking Global | 1.26M | 0.62% | $374.3M | opened | 2026 Q1 |
| Morgan Stanley | 1.22M | 0.60% | $364.0M | added +69.9% | ≤2013 |
| Veritas Asset Management LLP (focused) | 1.20M | 0.59% | $357.7M | trimmed -3.3% | 2025 Q3 |
| T. Rowe Price | 1.12M | 0.56% | $334.8M | added +67.5% | ≤2013 |
| Fundsmith Investment Services LTD. (focused) | 1.10M | 0.54% | $326.7M | trimmed -4.3% | 2022 Q1 |
| Northern Trust | 1.04M | 0.52% | $310.5M | added +52.3% | ≤2013 |
| D. E. Shaw | 1.03M | 0.51% | $305.4M | added +191.3% | ≤2013 |
| Principal Financial Group INC | 1.02M | 0.51% | $304.1M | added +17% | ≤2013 |
| Holocene Advisors | 917.1k | 0.45% | $273.2M | added +122.7% | 2025 Q3 |
| Bank OF America CORP /DE/ | 843.6k | 0.42% | $251.3M | added +44.2% | ≤2013 |
| AKO Capital LLP (focused) | 816.9k | 0.41% | $243.3M | added +8.4% | 2023 Q3 |
| Dimensional Fund Advisors | 814.7k | 0.40% | $242.7M | added +60.8% | ≤2013 |
| Wellington Management | 811.3k | 0.40% | $241.7M | added +197.5% | 2021 Q4 |
| Charles Schwab Investment Management | 772.5k | 0.38% | $230.1M | added +70.4% | ≤2013 |
| Franklin Resources | 709.5k | 0.35% | $211.4M | added +1065.5% | ≤2013 |
| Ameriprise Financial INC | 695.6k | 0.34% | $207.2M | added +670.9% | ≤2013 |
| Legal & General Group PLC | 684.8k | 0.34% | $204.0M | added +57.9% | ≤2013 |
| Goldman Sachs | 563.1k | 0.28% | $167.7M | added +20.3% | ≤2013 |
| Deutsche Bank AG\ | 535.7k | 0.27% | $159.6M | added +87.6% | 2013 Q3 |
| Artisan Partners | 534.6k | 0.27% | $159.2M | added +43% | 2023 Q3 |
| BNY Mellon | 528.9k | 0.26% | $157.5M | added +63.6% | ≤2013 |
| Manufacturers Life Insurance Company, THE | 525.2k | 0.26% | $156.5M | added +615.8% | ≤2013 |
| FMR (Fidelity) | 502.8k | 0.25% | $149.8M | added +214% | ≤2013 |
| Allspring Global Investments Holdings, LLC | 488.9k | 0.24% | $145.6M | added +18305.6% | 2021 Q4 |
| Voya Investment Management LLC | 486.6k | 0.24% | $144.9M | added +38.7% | ≤2013 |
| Clearbridge Investments, LLC | 478.3k | 0.24% | $142.5M | opened | 2026 Q1 |
| Focus Partners Wealth | 474.9k | 0.23% | $141.4M | added +74.7% | 2023 Q4 |
| Findlay Park Partners LLP | 467.2k | 0.23% | $139.2M | added +1.9% | 2023 Q3 |
| Hsbc Holdings PLC | 465.0k | 0.23% | $138.5M | added +17.6% | ≤2013 |
| Beck Mack & Oliver LLC | 432.2k | 0.21% | $128.7M | added +10.6% | ≤2013 |
| Amundi | 432.1k | 0.21% | $128.7M | added +20.1% | 2016 Q2 |
| Neuberger Berman Group LLC | 382.9k | 0.19% | $114.1M | added +413.9% | 2020 Q4 |
| London CO OF Virginia | 355.3k | 0.18% | $105.8M | trimmed -29.6% | 2023 Q3 |
| Point72 | 354.4k | 0.18% | $105.6M | added +462.9% | 2025 Q3 |
| Schroder Investment Management Group | 316.2k | 0.16% | $94.2M | added +1174.4% | ≤2013 |
| Impax Asset Management Group plc | 314.6k | 0.16% | $93.7M | added +35.5% | 2016 Q3 |
| First Trust Advisors LP | 303.1k | 0.15% | $90.3M | trimmed -24.6% | 2019 Q1 |
Largest 50 of 1,136 shown; the full ranked, searchable register is at boothcheck.com/holders/WAT. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.