Filing Flows › Mastec (MTZ) › Who owns the stock
Who owns Mastec (MTZ) stock
803 funds reported Mastec (MTZ) shares in their latest 13F filings, worth $23.5B in all. The largest holder is BlackRock ($3.2B). Last quarter 453 funds added to their stakes and 325 cut them. Members of Congress and other officials disclosed 5 trades (1 buys, 4 sales).
Largest holders (13F)
| Fund | Shares | Value | Change | Quarter |
|---|---|---|---|---|
| BlackRock | 7,638,487 | $3.2B | increase | 2026-06-30 |
| Peconic Partners LLC | 3,678,431 | $1.5B | increase | 2026-06-30 |
| Vanguard Group | 5,932,754 | $1.3B | decrease | 2025-12-31 |
| Vanguard Capital Management LLC | 2,831,849 | $1.2B | increase | 2026-06-30 |
| Vanguard Portfolio Management LLC | 2,812,131 | $1.2B | increase | 2026-06-30 |
| State Street | 2,244,771 | $934M | increase | 2026-06-30 |
| Lone Pine Capital LLC | 1,345,157 | $560M | decrease | 2026-06-30 |
| Bank of America | 1,335,924 | $556M | increase | 2026-06-30 |
| First Trust Advisors LP | 1,328,399 | $553M | decrease | 2026-06-30 |
| Geode Capital Management, LLC | 1,278,139 | $530M | decrease | 2026-06-30 |
| Invesco | 1,241,384 | $516M | increase | 2026-06-30 |
| Victory Capital Management | 1,210,079 | $503M | decrease | 2026-06-30 |
| Hood River Capital Management LLC | 1,173,918 | $488M | decrease | 2026-06-30 |
| FMR LLC | 890,103 | $370M | increase | 2026-06-30 |
| Ameriprise Financial | 734,976 | $306M | increase | 2026-06-30 |
Trades by Congress and other officials
| Date | Who | Trade | Amount |
|---|---|---|---|
| 2026-08-21 | Thomas H. Kean Jr | purchase | $1K–$15K |
| 2026-02-04 | Markwayne Mullin | sale | $15K–$50K |
| 2025-12-18 | Markwayne Mullin | sale | $15K–$50K |
| 2025-12-18 | Markwayne Mullin | sale | $15K–$50K |
| 2025-10-31 | Lisa McClain | sale | $1K–$15K |
Mastec's latest quarter
Mastec, Q3 2026: revenue $5.2B (+30% year over year), operating margin 5.3%, net earnings $151M, operating cash flow $267M. The chart follows the revenue to costs, profit and cash.
Questions
Who owns the most MTZ stock?
By the latest 13F filings: BlackRock ($3.2B); Peconic Partners LLC ($1.5B); Vanguard Group ($1.3B); Vanguard Capital Management LLC ($1.2B); Vanguard Portfolio Management LLC ($1.2B).
Has Congress traded MTZ stock?
Officials disclosed 5 trades on file: 1 buys and 4 sales. The latest: Thomas H. Kean Jr, purchase on 2026-08-21.
What is the short interest in MTZ?
4,473,139 shares were sold short at the 2026-10-15 settlement, -2.63% of the float.
Updated Nov 8, 2026. Read automatically from SEC filings and public data; errors are possible. Not investment advice.