MasTec, Inc.
MasTec, Inc. (MTZ) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MTZ · as of Sep 30, 2025
Ownership Breakdown
677
Institutional Holders
▲ 56 vs Q2
$12.17B
Total Inst. Value
▲ $2.01B vs Q2
79.02M
Shares Outstanding
freeFloat 76.77%
57.22M
13F Shares Held
▲ 1.30M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MTZ largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. water, sewer, pipeline, comm & power line construction | 7.74M | 9.90% | 9.90% | $1.65T | Nov 12, 2025 | ▼ 420.8K |
VANGUARD GROUP INC water, sewer, pipeline, comm & power line construction | 6.01M | 7.68% | 7.68% | $1.28T | Nov 7, 2025 | ▲ 34.9K |
HILL CITY CAPITAL, LP water, sewer, pipeline, comm & power line construction | 2.15M | 2.76% | 2.76% | $458.61B | Nov 13, 2025 | — held |
STATE STREET CORP water, sewer, pipeline, comm & power line construction | 1.84M | 2.35% | 2.35% | $390.96B | Nov 14, 2025 | ▼ 36.4K |
INVESCO LTD. water, sewer, pipeline, comm & power line construction | 1.66M | 2.13% | 2.13% | $354.20B | Nov 13, 2025 | ▼ 100.6K |
HOOD RIVER CAPITAL MANAGEMENT LLC water, sewer, pipeline, comm & power line construction | 1.65M | 2.11% | 2.11% | $350.38B | Nov 14, 2025 | ▼ 46.2K |
NORDEA INVESTMENT MANAGEMENT AB water, sewer, pipeline, comm & power line construction | 1.34M | 1.72% | 1.72% | $283.26B | Oct 27, 2025 | ▼ 36.2K |
GEODE CAPITAL MANAGEMENT, LLC water, sewer, pipeline, comm & power line construction | 1.13M | 1.44% | 1.44% | $239.74B | Nov 12, 2025 | ▲ 24.1K |
FIRST TRUST ADVISORS LP water, sewer, pipeline, comm & power line construction | 1.02M | 1.31% | 1.31% | $217.53B | Nov 12, 2025 | ▲ 350.2K |
VICTORY CAPITAL MANAGEMENT INC water, sewer, pipeline, comm & power line construction | 946.6K | 1.21% | 1.21% | $201.30B | Nov 12, 2025 | ▲ 936.7K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
22
Increased
+4.11M shares5
New Positions
first time holders22
Decreased
−2.76M shares0
Sold Out
fully exitedNet shares change (top 50)
+1.35M
+4.11M / −2.76M
Net new holders
+5
5 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MTZ insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
6
Buy transactions
6
Sell transactions
1.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Csiszar Ernst N director | Jun 3, 2026 | Sale | 6,500 | $371.17 | $2.41M | 10.8K | Form 4 ↗ |
Csiszar Ernst N director | May 15, 2026 | Award | 104 | — | — | 17.3K | Form 4 ↗ |
Csiszar Ernst N director | May 15, 2026 | Tax Withhold | 23 | $434.77 | $10.0K | 17.3K | Form 4 ↗ |
Dwyer Robert J director | May 15, 2026 | Award | 95 | — | — | 20.9K | Form 4 ↗ |
Dwyer Robert J director | May 15, 2026 | Tax Withhold | 21 | $434.77 | $9.1K | 20.9K | Form 4 ↗ |
Parker Ava L director | May 15, 2026 | Award | 121 | — | — | 5.4K | Form 4 ↗ |
Parker Ava L director | May 15, 2026 | Tax Withhold | 14 | $434.77 | $6.1K | 5.4K | Form 4 ↗ |
Campbell C Robert director | May 15, 2026 | Award | 95 | — | — | 30.7K | Form 4 ↗ |
Palomarez Javier Alberto director | May 15, 2026 | Award | 95 | — | — | 10.7K | Form 4 ↗ |
Palomarez Javier Alberto director | May 15, 2026 | Tax Withhold | 21 | $434.77 | $9.1K | 10.7K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
MasTec, Inc. (MTZ) is primarily owned by institutional investors, who hold approximately 72.4% of total shares outstanding. Company insiders own approximately 23.23%, while retail and public investors account for the remaining 4.35%.
The largest institutional shareholder of MasTec, Inc. is BLACKROCK, INC., holding approximately 7.74 million shares — equal to 9.90% of outstanding shares — as of September 30, 2025.
A total of 677 institutional investors currently hold MTZ stock, with a combined institutional value of approximately $12.17 billion as of the most recent 13F filing period.
Frequently asked questions
MTZ ownershipMasTec, Inc. (MTZ) is primarily owned by institutional investors, who hold approximately 72.4% of shares. The largest shareholder is BLACKROCK, INC. with a 9.90% stake. Company insiders hold 23.23%. Data sourced from SEC Form 13F as of September 30, 2025.