Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
297 institutional managers reported holding MAC for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 65%. 32 opened new positions; 32 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 46.26M | 17.93% | $875.2M | added +1.7% | ≤2013 |
| Vanguard Group | 39.30M | 15.23% | $743.6M | added +1.8% | ≤2013 |
| FMR (Fidelity) | 24.05M | 9.32% | $455.0M | added +21.8% | ≤2013 |
| State Street | 14.78M | 5.73% | $279.7M | trimmed -0.8% | ≤2013 |
| Smead Capital Management, INC. (focused) | 12.16M | 4.71% | $230.0M | trimmed -13% | 2019 Q3 |
| Centersquare Investment Management LLC | 7.27M | 2.82% | $137.6M | added +14.5% | 2024 Q2 |
| T. Rowe Price Investment Management, INC. | 6.88M | 2.67% | $130.2M | added +220% | 2024 Q1 |
| Geode Capital | 6.86M | 2.66% | $129.7M | added +3.7% | ≤2013 |
| Charles Schwab Investment Management | 5.21M | 2.02% | $98.7M | added +3.5% | ≤2013 |
| Wellington Management | 5.05M | 1.96% | $95.6M | added +37.5% | 2023 Q4 |
| Northern Trust | 4.47M | 1.73% | $84.6M | added +1.8% | ≤2013 |
| Resolution Capital LTD (focused) | 4.38M | 1.70% | $82.9M | added +204% | 2025 Q4 |
| Bamco INC /NY/ | 4.08M | 1.58% | $77.3M | added +24.3% | 2024 Q1 |
| Dimensional Fund Advisors | 3.85M | 1.49% | $72.8M | added +1.7% | ≤2013 |
| Goldman Sachs | 3.47M | 1.34% | $65.7M | added +4.7% | ≤2013 |
| Pggm Investments | 3.37M | 1.31% | $63.8M | trimmed -16.2% | 2025 Q1 |
| Ameriprise Financial INC | 2.87M | 1.11% | $54.3M | trimmed -0.8% | ≤2013 |
| Fisher Investments | 2.71M | 1.05% | $51.2M | trimmed -6.5% | 2022 Q4 |
| Morgan Stanley | 2.61M | 1.01% | $49.3M | added +3.6% | ≤2013 |
| Citadel Advisors | 2.60M | 1.01% | $49.3M | trimmed -41.1% | 2017 Q2 |
| FIL LTD | 2.52M | 0.98% | $47.7M | added +18.8% | 2024 Q2 |
| Bank OF America CORP /DE/ | 2.24M | 0.87% | $42.4M | added +117.7% | ≤2013 |
| BNY Mellon | 2.14M | 0.83% | $40.6M | trimmed -1.9% | ≤2013 |
| Janus Henderson | 2.11M | 0.82% | $40.0M | trimmed -6.1% | 2021 Q3 |
| Letko, Brosseau & Associates INC | 1.88M | 0.73% | $35.6M | unchanged | 2021 Q2 |
| UBS | 1.83M | 0.71% | $34.7M | trimmed -42.7% | ≤2013 |
| Legal & General Group PLC | 1.68M | 0.65% | $31.7M | trimmed -6.7% | ≤2013 |
| Schroder Investment Management Group | 1.59M | 0.62% | $30.1M | opened | 2026 Q1 |
| Millennium Management | 1.58M | 0.61% | $29.9M | trimmed -5.3% | 2013 Q4 |
| Nomura Asset Management International INC. | 1.30M | 0.50% | $24.5M | trimmed -6.8% | 2025 Q4 |
| Principal Financial Group INC | 1.24M | 0.48% | $23.6M | added +2% | ≤2013 |
| Nuveen | 1.20M | 0.46% | $22.6M | trimmed -51.3% | ≤2013 |
| Heitman Real Estate Securities LLC | 1.14M | 0.44% | $21.5M | opened | 2026 Q1 |
| Public Sector Pension Investment Board | 916.3k | 0.35% | $17.3M | added +3.4% | 2023 Q2 |
| Hsbc Holdings PLC | 904.0k | 0.35% | $17.1M | added +5.9% | ≤2013 |
| Neuberger Berman Group LLC | 815.5k | 0.32% | $15.4M | trimmed -6.6% | 2023 Q1 |
| Rhumbline Advisers | 766.6k | 0.30% | $14.5M | added +0.6% | ≤2013 |
| 1832 Asset Management L.p. | 727.7k | 0.28% | $13.8M | added +45.4% | 2025 Q3 |
| Qube Research & Technologies LTD | 691.8k | 0.27% | $13.1M | added +39.1% | 2025 Q4 |
| Canada Life Assurance CO | 629.0k | 0.24% | $11.9M | trimmed -1.5% | ≤2013 |
| Triad Investment Management | 620.7k | 0.24% | $11.7M | added +200% | 2025 Q4 |
| Apollo Management | 609.6k | 0.24% | $11.5M | added +9.5% | 2025 Q4 |
| Woodline Partners LP | 584.1k | 0.23% | $11.1M | trimmed -39.2% | 2024 Q4 |
| Invesco | 574.8k | 0.22% | $10.9M | trimmed -6.4% | ≤2013 |
| Nordea Investment Management AB | 549.7k | 0.21% | $10.4M | added +100% | 2025 Q3 |
| Russell Investments Group, LTD. | 512.9k | 0.20% | $9.7M | added +5% | 2016 Q4 |
| Swiss National Bank | 506.9k | 0.20% | $9.6M | added +1.7% | ≤2013 |
| LPL Financial LLC | 499.4k | 0.19% | $9.4M | trimmed -1% | 2019 Q4 |
| AllianceBernstein | 449.8k | 0.17% | $8.5M | trimmed -6.5% | ≤2013 |
| Sumitomo Mitsui Trust Group, INC. | 435.9k | 0.17% | $8.2M | added +14.6% | ≤2013 |
Largest 50 of 297 shown; the full ranked, searchable register is at boothcheck.com/holders/MAC. 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.