Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
410 institutional managers reported holding MWA for the quarter ended Mar 31, 2026. Together they hold about 93% of shares outstanding; the top 10 hold 52%. 61 opened new positions; 41 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 25.14M | 15.97% | $691.1M | unchanged | ≤2013 |
| Vanguard Group | 19.69M | 12.51% | $541.3M | added +1.2% | ≤2013 |
| State Street | 6.23M | 3.96% | $171.4M | added +1.1% | ≤2013 |
| First Trust Advisors LP | 6.04M | 3.83% | $166.0M | added +34% | ≤2013 |
| Fuller & Thaler Asset Management, INC. | 5.17M | 3.28% | $142.1M | added +1.7% | 2024 Q3 |
| Geode Capital | 4.66M | 2.96% | $128.1M | added +4.1% | ≤2013 |
| Fiduciary Management INC /WI/ | 4.16M | 2.64% | $114.3M | added +31.3% | 2025 Q4 |
| Dimensional Fund Advisors | 3.60M | 2.29% | $99.1M | unchanged | ≤2013 |
| Franklin Resources | 3.38M | 2.15% | $92.8M | added +4.2% | 2023 Q2 |
| Impax Asset Management Group plc | 2.95M | 1.87% | $81.1M | trimmed -12.4% | 2013 Q3 |
| American Century Companies INC | 2.87M | 1.82% | $79.0M | added +38.4% | 2020 Q4 |
| Principal Financial Group INC | 2.83M | 1.80% | $77.9M | trimmed -13.5% | ≤2013 |
| Gamco Investors, INC. et al | 2.55M | 1.62% | $70.1M | trimmed -0.6% | ≤2013 |
| Amundi | 2.26M | 1.44% | $62.2M | trimmed -3.8% | 2017 Q4 |
| Morgan Stanley | 2.17M | 1.38% | $59.6M | added +5.3% | ≤2013 |
| Invesco | 2.03M | 1.29% | $55.7M | trimmed -30.3% | ≤2013 |
| Janus Henderson | 1.93M | 1.23% | $53.2M | added +58.6% | 2021 Q3 |
| Charles Schwab Investment Management | 1.86M | 1.18% | $51.0M | trimmed -0.8% | ≤2013 |
| Nuveen | 1.81M | 1.15% | $49.8M | trimmed -5.9% | 2019 Q2 |
| Northern Trust | 1.59M | 1.01% | $43.6M | unchanged | ≤2013 |
| Mirae Asset Global Etfs Holdings LTD. | 1.51M | 0.96% | $41.5M | added +12.9% | 2018 Q3 |
| Federated Hermes, INC. | 1.46M | 0.93% | $40.2M | added +4.8% | 2024 Q3 |
| UBS | 1.33M | 0.85% | $36.6M | trimmed -20.3% | ≤2013 |
| Balyasny Asset Management | 1.31M | 0.83% | $36.0M | added +100.5% | 2025 Q4 |
| Allianz Asset Management GmbH | 1.17M | 0.74% | $32.1M | trimmed -25.1% | 2024 Q3 |
| BNY Mellon | 1.08M | 0.68% | $29.6M | trimmed -2.4% | ≤2013 |
| Legal & General Group PLC | 1.07M | 0.68% | $29.5M | trimmed -1.7% | ≤2013 |
| Triodos Investment Management BV (focused) | 1.01M | 0.64% | $27.7M | trimmed -7.5% | 2020 Q1 |
| FMR (Fidelity) | 964.8k | 0.61% | $26.5M | added +19.7% | 2018 Q3 |
| Ameriprise Financial INC | 933.6k | 0.59% | $25.7M | trimmed -44.3% | ≤2013 |
| Goldman Sachs | 901.8k | 0.57% | $24.8M | trimmed -8.9% | ≤2013 |
| Two Sigma | 895.3k | 0.57% | $24.6M | added +190.2% | 2021 Q4 |
| Bank OF America CORP /DE/ | 889.0k | 0.56% | $24.4M | added +30% | ≤2013 |
| Algert Global LLC | 846.5k | 0.54% | $23.3M | added +105.5% | 2024 Q2 |
| GAMCO (Gabelli) | 674.3k | 0.43% | $18.5M | unchanged | ≤2013 |
| Aberdeen Group plc | 649.9k | 0.41% | $17.9M | trimmed -6.4% | 2025 Q1 |
| Millennium Management | 627.1k | 0.40% | $17.2M | trimmed -18.7% | ≤2013 |
| Bessemer Group INC | 588.8k | 0.37% | $16.2M | added +354.9% | 2022 Q4 |
| Envestnet Asset Management INC | 588.6k | 0.37% | $16.2M | added +6.4% | 2014 Q1 |
| Voya Investment Management LLC | 588.1k | 0.37% | $16.2M | trimmed -6.6% | ≤2013 |
| Gw&k Investment Management, LLC | 583.7k | 0.37% | $16.0M | trimmed -8.3% | 2025 Q1 |
| Panagora Asset Management INC | 567.9k | 0.36% | $15.6M | trimmed -14.2% | 2024 Q2 |
| Assenagon Asset Management S.a. | 563.2k | 0.36% | $15.5M | trimmed -33.2% | 2023 Q4 |
| Public Sector Pension Investment Board | 559.5k | 0.35% | $15.4M | added +3.4% | 2025 Q1 |
| Duff & Phelps Investment Management CO | 492.1k | 0.31% | $13.5M | trimmed -10.2% | 2022 Q3 |
| Lightrock Netherlands B.v. (focused) | 474.8k | 0.30% | $13.1M | trimmed -4.4% | 2024 Q4 |
| Brown Advisory INC | 469.2k | 0.30% | $12.9M | trimmed -59.6% | 2018 Q2 |
| Crawford Investment Counsel INC | 450.9k | 0.29% | $12.4M | unchanged | 2017 Q3 |
| Credit Agricole S A | 450.7k | 0.29% | $12.4M | trimmed -13.6% | 2024 Q3 |
| Perpetual LTD | 436.3k | 0.28% | $12.0M | added +1.6% | 2023 Q1 |
Largest 50 of 410 shown; the full ranked, searchable register is at boothcheck.com/holders/MWA. 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.