// company-profile
Mastec Inc
MTZExchangeNYSESectorWater, Sewer, Pipeline, Comm & Power Line ConstructionInc.FLFilings145Insiders12
// api This Mastec Inc insider-trading data is served live by the Form4API insider trading API. Get the same data via API.
// activity-summary
Recent insider activity is bearish. Over the last 30 days, insiders net sold $2.4M across 1 transaction.
// 90-day insight
Over the last 90 days, Mastec Inc insiders bought $0 (6 transactions) and sold $3.7M (6 transactions).
- Most active insider: Csiszar Ernst N with 3 transactions totaling $2.4M.
- Largest single sale: $2.4M by Csiszar Ernst N on Jun 3, 2026.
Activity is mixed — buys and sales are roughly balanced.
Institutional Ownership
Top 13F-HR holders of Mastec Inc as of 2026-03-31
Total reported AUM
$17.36B
QoQ change
+57.1%
Reporting period
2026-03-31
#1
BlackRock, Inc.
CIK 2012383
$1.15B
3.6M shares
#2
PECONIC PARTNERS LLC
CIK 1050464
$1.15B
3.6M shares
#3
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
$902.3M
2.8M shares
Data source: SEC Form 13F-HR filings. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jun 3, 2026 | Csiszar Ernst N | MTZ | Sale | 6,500 | $371.17 | $2.41M |
| May 15, 2026 | Dwyer Robert J | MTZ | Award | 95 | $0.00 | $0K |
| May 15, 2026 | Parker Ava L | MTZ | Tax Withholding | 14 | $434.77 | $6K |
| May 15, 2026 | Parker Ava L | MTZ | Award | 121 | $0.00 | $0K |
| May 15, 2026 | Csiszar Ernst N | MTZ | Award | 104 | $0.00 | $0K |
45 more transactions hidden
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