MasTec Ownership & Insider Activity

MasTec (MTZ) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 11.2% of shares outstanding. Institutional investors hold 44.9%.

Shares Outstanding

80.305M

Shares Float

63.422M

Insider Shares Owned

9.020M

Insider % Owned

11.2%

Institutional Shares Held

36.048M

Institutional % Held

44.9%

Ownership Breakdown

Net Insider Activity by Month

MasTec Insider Transactions (Last 6 Months)

Date	Insider	Title	Type	Shares	Price	Value
Jun 3, 2026	Ernst Csiszar	DIRECTOR	SELL	6.500K	$371.17	$2.4M
May 4, 2026	Robert Campbell	DIRECTOR	SELL	3.000K	$417.00	$1.3M

Date	Member	Party	Chamber	Action	Amount
Aug 21, 2026	Thomas Kean	R	House	Purchase	$1,001 - $15,000
Feb 4, 2026	Markwayne Mullin	R	Senate	Sale	$15,001 - $50,000
Dec 18, 2025	Markwayne Mullin	R	Senate	Sale	$15,001 - $50,000
Dec 18, 2025	Markwayne Mullin	R	Senate	Sale	$15,001 - $50,000
Oct 31, 2025	Lisa McClain	R	House	Sale	$1,001 - $15,000
Oct 30, 2025	Lisa McClain	R	House	Purchase	$1,001 - $15,000
Oct 30, 2025	Lisa McClain	R	House	Sale	$1,001 - $15,000
Jun 11, 2025	Lisa McClain	R	House	Purchase	$1,001 - $15,000
Feb 3, 2025	Markwayne Mullin	R	Senate	Purchase	$1,001 - $15,000
Jan 2, 2025	Markwayne Mullin	R	Senate	Purchase	$15,001 - $50,000
Jan 2, 2025	Markwayne Mullin	R	Senate	Purchase	$15,001 - $50,000