Across its top 20 institutional holders, MTZ's holder base skews toward low-concentration, low-turnover investors on average (avg. concentration score 13/100, avg. turnover score 28/100).

Quarterly Activity

Recent Activity

+$10.1B

Total Buy Value

$6.2B

Total Sell Value

New buy170

Trim263

Add251

Sold out65

421

Net Buyers

328

Net Sellers

Smart Money Convergence

MTZ does not currently have enough recent insider (Form 4) trading activity to compute a convergence signal against its 13F institutional flows.

13F data as of 2026-06-30 quarterly filings. Note: many large institutions file close to the 45-day post-quarter deadline, so early-quarter flow figures can shift substantially as more filings arrive.

Insider Trading (Form 4)

Form 144 Pre-Sale Notices

Filings (90d)

$2.41M

Total Est. Value

7K shares

Planned Shares

Last Filed 2026-06-03

Filer	Title/Relationship	Filing Date	Planned Shares	Est. Value
Csiszar Ernst N	Director	2026-06-03	7K shares	$2.41M

Form 144 is a planned sale notice, not an executed transaction. Form 144 Tracker。

Beneficial Ownership (13D/13G)

No Schedule 13D/13G filings for this ticker

Material Events (8-K)

Filings (14d)

Data as of 2026-07-07

2026-07-07

On July 7, 2026, MasTec Inc. (MTZ) and its subsidiary MasTec North America entered into a new $700 million delayed draw term loan agreement with Bank of America as administrative agent. The loan consists of a $400 million three-tranche and a $300 million four-year tranche, and the proceeds will finance part of an acquisition and related expenses. The same day, the company also amended its existing credit facility.

View Full Filing (SEC EDGAR)

View all Form 8-K filings

CUSIP

576323109

FAQ

Who are the top institutional investors holding MASTEC INC (MTZ)?

Major stakeholders currently include BlackRock, Inc. ($2.4B), Peconic Partners LLC ($1.2B), Vanguard Capital Management LLC ($902.3M). Based on the latest 13F filings, there are a total of 801 tracked investment funds and institutions maintaining positions in MTZ.

What is the overall institutional sentiment toward MTZ recently?

Institutional sentiment appears Bullish (Net Buying). During the most recent reporting quarter, the stock experienced a net inflow of $5.9B, driven by 421 managers accumulating shares while 328 reduced their exposure.

Which institutions have been selling or reducing their MTZ positions?

In the latest period, 263 funds trimmed their holdings, and 65 managers completely exited their positions. The aggregate reported sell value was $6.2B.

Are there any notable investors adding MTZ to their portfolios?

Yes, buying activity remains notable. 170 institutions opened new positions in {ticker}, and 251 existing holders added to their shares. The total reported buy value for the quarter amounted to $10.1B.