Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
380 institutional managers reported holding MATX for the quarter ended Mar 31, 2026. Together they hold about 90% of shares outstanding; the top 10 hold 58%. 71 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 | 5.01M | 16.38% | $818.4M | trimmed -1.2% | ≤2013 |
| Vanguard Group | 3.58M | 11.70% | $584.3M | trimmed -2.6% | ≤2013 |
| Dimensional Fund Advisors | 1.95M | 6.36% | $317.8M | trimmed -1.8% | ≤2013 |
| Pacer Advisors, INC. | 1.88M | 6.15% | $307.3M | added +158750.4% | 2021 Q2 |
| American Century Companies INC | 1.50M | 4.91% | $245.3M | added +13.7% | 2019 Q4 |
| State Street | 1.21M | 3.95% | $197.2M | unchanged | ≤2013 |
| Geode Capital | 775.4k | 2.53% | $126.6M | added +1.3% | ≤2013 |
| Capital Research Global Investors | 635.1k | 2.08% | $103.7M | trimmed -4% | 2017 Q2 |
| Fuller & Thaler Asset Management, INC. | 613.2k | 2.00% | $100.1M | added +0.8% | 2014 Q1 |
| T. Rowe Price Investment Management, INC. | 527.8k | 1.73% | $86.2M | added +145.5% | 2022 Q3 |
| Morgan Stanley | 413.6k | 1.35% | $67.5M | trimmed -3.9% | ≤2013 |
| Northern Trust | 383.2k | 1.25% | $62.6M | added +0.6% | ≤2013 |
| Charles Schwab Investment Management | 373.3k | 1.22% | $60.9M | unchanged | ≤2013 |
| FMR (Fidelity) | 324.3k | 1.06% | $52.9M | added +53.3% | 2015 Q4 |
| Balyasny Asset Management | 315.2k | 1.03% | $51.5M | added +53% | 2021 Q3 |
| LSV Asset Management | 309.3k | 1.01% | $50.5M | unchanged | 2022 Q1 |
| Boston Partners | 291.1k | 0.95% | $47.5M | trimmed -5.9% | 2024 Q3 |
| BNY Mellon | 263.8k | 0.86% | $43.1M | trimmed -2.2% | ≤2013 |
| London CO OF Virginia | 244.3k | 0.80% | $39.9M | trimmed -3.1% | ≤2013 |
| Caisse de depot et placement du Quebec | 243.3k | 0.80% | $39.7M | added +5.1% | 2024 Q3 |
| Algert Global LLC | 222.9k | 0.73% | $36.4M | trimmed -15.2% | 2022 Q1 |
| Citadel Advisors | 203.0k | 0.66% | $33.1M | trimmed -15.3% | 2022 Q1 |
| Bank OF America CORP /DE/ | 200.9k | 0.66% | $32.8M | added +12.6% | ≤2013 |
| Encompass Capital Advisors LLC | 199.8k | 0.65% | $32.6M | opened | 2026 Q1 |
| Qube Research & Technologies LTD | 196.2k | 0.64% | $32.0M | added +43% | 2020 Q2 |
| Goldman Sachs | 184.6k | 0.60% | $30.1M | trimmed -3.9% | ≤2013 |
| D. E. Shaw | 176.5k | 0.58% | $28.8M | trimmed -60.6% | ≤2013 |
| Victory Capital Management INC | 176.3k | 0.58% | $28.8M | trimmed -12.3% | 2015 Q2 |
| Royce & Associates | 174.0k | 0.57% | $28.4M | added +13.3% | 2025 Q3 |
| William Blair Investment Management, LLC | 167.1k | 0.55% | $27.3M | added +3.4% | 2025 Q2 |
| Principal Financial Group INC | 151.5k | 0.49% | $24.7M | trimmed -23.4% | ≤2013 |
| Invesco | 146.9k | 0.48% | $24.0M | added +0.6% | ≤2013 |
| Schonfeld Strategic Advisors | 146.1k | 0.48% | $23.9M | added +598.2% | 2023 Q3 |
| Public Sector Pension Investment Board | 111.5k | 0.36% | $18.2M | added +3.4% | 2014 Q1 |
| Silvercrest Asset Management Group LLC | 107.7k | 0.35% | $17.6M | trimmed -49.2% | 2024 Q4 |
| Envestnet Asset Management INC | 100.5k | 0.33% | $16.4M | added +3% | ≤2013 |
| UBS | 99.6k | 0.33% | $16.3M | trimmed -8.2% | ≤2013 |
| Baird Financial Group, INC. | 97.1k | 0.32% | $15.8M | added +2.3% | 2022 Q1 |
| Nuveen | 94.5k | 0.31% | $15.4M | trimmed -9.1% | 2019 Q2 |
| Rhumbline Advisers | 94.2k | 0.31% | $15.4M | trimmed -1.1% | ≤2013 |
| Hudson Bay Capital | 92.6k | 0.30% | $15.1M | added +157.3% | 2024 Q2 |
| Verition Fund Management | 89.6k | 0.29% | $14.6M | added +56.6% | 2023 Q4 |
| Wedge Capital Management L L P/NC | 89.3k | 0.29% | $14.6M | trimmed -24.8% | 2024 Q4 |
| Paradiem, LLC | 88.1k | 0.29% | $14.4M | trimmed -11.7% | 2022 Q3 |
| Loomis Sayles & CO L P | 87.7k | 0.29% | $14.3M | trimmed -3.4% | 2025 Q4 |
| Franklin Resources | 85.9k | 0.28% | $14.0M | added +141.9% | 2021 Q2 |
| First Trust Advisors LP | 81.3k | 0.27% | $13.3M | added +61.6% | ≤2013 |
| Ameriprise Financial INC | 80.4k | 0.26% | $13.1M | trimmed -69.3% | ≤2013 |
| SummitTX Capital, L.p. | 72.8k | 0.24% | $11.9M | added +42.8% | 2025 Q1 |
| Susquehanna International Group | 71.7k | 0.23% | $11.7M | trimmed -3% | 2018 Q1 |
Largest 50 of 380 shown; the full ranked, searchable register is at boothcheck.com/holders/MATX. 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.