Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
776 institutional managers reported holding MTZ for the quarter ended Mar 31, 2026. Together they hold about 73% of shares outstanding; the top 10 hold 36%. 166 opened new positions; 72 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 7.31M | 9.28% | $2.35B | added +2.8% | ≤2013 |
| Vanguard Group | 6.05M | 7.68% | $1.95B | added +1.9% | ≤2013 |
| Peconic Partners LLC (focused) | 3.58M | 4.54% | $1.15B | added +123.7% | 2025 Q3 |
| Hill City Capital, LP (focused) | 2.15M | 2.73% | $692.7M | unchanged | 2022 Q4 |
| State Street | 1.87M | 2.37% | $601.0M | added +2.4% | ≤2013 |
| Victory Capital Management INC | 1.59M | 2.02% | $511.9M | trimmed -39.6% | 2017 Q3 |
| Lone Pine Capital (focused) | 1.53M | 1.94% | $492.1M | opened | 2026 Q1 |
| First Trust Advisors LP | 1.41M | 1.79% | $453.7M | added +7.6% | 2014 Q1 |
| Geode Capital | 1.37M | 1.74% | $441.0M | added +12.4% | ≤2013 |
| Bank OF America CORP /DE/ | 1.33M | 1.69% | $427.5M | added +6% | ≤2013 |
| Hood River Capital Management LLC | 1.30M | 1.64% | $416.4M | trimmed -12.7% | 2020 Q4 |
| Invesco | 1.23M | 1.56% | $394.0M | trimmed -19.4% | ≤2013 |
| Nordea Investment Management AB | 733.6k | 0.93% | $235.8M | trimmed -36.2% | 2017 Q4 |
| Dimensional Fund Advisors | 731.6k | 0.93% | $235.2M | trimmed -16% | ≤2013 |
| Electron Capital Partners, LLC (focused) | 713.0k | 0.91% | $229.2M | trimmed -11.4% | 2020 Q4 |
| UBS | 697.3k | 0.89% | $224.1M | trimmed -9.4% | ≤2013 |
| Mirae Asset Global Etfs Holdings LTD. | 660.2k | 0.84% | $212.2M | added +18.4% | 2018 Q3 |
| AQR Capital | 660.1k | 0.84% | $212.2M | trimmed -9.7% | 2015 Q3 |
| BNY Mellon | 656.1k | 0.83% | $210.9M | added +3.1% | ≤2013 |
| CPP Investment Board | 639.0k | 0.81% | $205.4M | added +325.6% | 2024 Q1 |
| FMR (Fidelity) | 627.9k | 0.80% | $201.8M | trimmed -5.5% | 2018 Q3 |
| Morgan Stanley | 586.7k | 0.74% | $188.6M | added +19.8% | ≤2013 |
| Coatue Management | 583.6k | 0.74% | $187.6M | trimmed -13.9% | 2025 Q4 |
| Charles Schwab Investment Management | 511.2k | 0.65% | $164.3M | added +1.8% | ≤2013 |
| Millennium Management | 503.2k | 0.64% | $161.7M | trimmed -31.3% | 2020 Q2 |
| Qube Research & Technologies LTD | 485.4k | 0.62% | $156.0M | added +34.5% | 2023 Q3 |
| Goldman Sachs | 474.5k | 0.60% | $152.5M | added +35.3% | ≤2013 |
| Northern Trust | 472.6k | 0.60% | $151.9M | added +3.7% | ≤2013 |
| Point72 | 433.1k | 0.55% | $139.2M | trimmed -39.9% | 2019 Q4 |
| Nomura Asset Management International INC. | 337.8k | 0.43% | $108.6M | trimmed -37.8% | 2025 Q4 |
| 140 Summer Partners LP (focused) | 329.2k | 0.42% | $105.8M | trimmed -12% | 2025 Q3 |
| BNP Paribas Financial Markets | 321.1k | 0.41% | $103.2M | added +78.9% | ≤2013 |
| Third Point (focused) | 320.0k | 0.41% | $102.9M | trimmed -65.4% | 2025 Q3 |
| Citadel Advisors | 279.8k | 0.35% | $89.9M | added +1215.5% | ≤2013 |
| Forest Avenue Capital Management LP (focused) | 269.9k | 0.34% | $86.7M | trimmed -45.4% | 2025 Q3 |
| Assenagon Asset Management S.a. | 255.2k | 0.32% | $82.0M | added +55.1% | 2023 Q3 |
| Westfield Capital Management CO LP | 250.0k | 0.32% | $80.3M | opened | 2026 Q1 |
| Bessemer Group INC | 232.0k | 0.29% | $74.6M | added +8079.3% | 2023 Q1 |
| Raymond James Financial INC | 231.9k | 0.29% | $74.5M | trimmed -15.6% | 2016 Q1 |
| Ameriprise Financial INC | 231.8k | 0.29% | $74.5M | unchanged | ≤2013 |
| Arrowstreet Capital | 227.3k | 0.29% | $73.1M | added +47.9% | 2024 Q4 |
| Squarepoint Ops LLC | 225.7k | 0.29% | $72.5M | added +96.8% | 2017 Q2 |
| Anomaly Capital Management, LP (focused) | 224.5k | 0.28% | $72.2M | opened | 2026 Q1 |
| Merewether Investment Management, LP | 223.1k | 0.28% | $71.7M | trimmed -60.8% | 2024 Q4 |
| Freestone Grove Partners LP | 220.4k | 0.28% | $70.8M | trimmed -51.6% | 2024 Q4 |
| Bowen Hanes & CO INC | 215.5k | 0.27% | $69.3M | added +10.2% | 2025 Q4 |
| Hennessy Advisors INC | 205.1k | 0.26% | $65.9M | trimmed -9.5% | 2025 Q3 |
| Manufacturers Life Insurance Company, THE | 187.9k | 0.24% | $60.4M | trimmed -21.5% | ≤2013 |
| Lord, Abbett & CO. LLC | 184.3k | 0.23% | $59.2M | trimmed -31.1% | 2024 Q4 |
| OP Asset Management LTD | 183.3k | 0.23% | $58.9M | trimmed -0.9% | 2025 Q1 |
Largest 50 of 776 shown; the full ranked, searchable register is at boothcheck.com/holders/MTZ. 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.