$MTZ

$172.59 +$1.54 (0.9%) Close

$MTZ Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 80.3M shares outstanding

Who owns MTZ?

By type of holder

Institutions 74.0% Insiders 26.0% Everyone else 0.0%

Concentration Top 10 holders own 52.3%

Jorge Mas 14.8% · BlackRock, Inc. 9.5%

Institutional ownership

74.0%

+1.7 pts vs last qtr

Institutional holders

909

+97 vs last qtr

Net shares bought

+1.4M

by institutions in Q2 2026

New / sold out

184 / 87

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Jpmorgan Chase & Co +1.1M
T. Rowe Price Investment Management, Inc. NEW +593.7K

Biggest sellers in Q2 2026

Millennium Management LLC −459.3K
Victory Capital Management Inc −382.4K

Who is planning to sell?

Notices of proposed sale, last 12 months

$6.32M

5 notices from 4 people

Shares covered

18.9K

0.02% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Ernest N Csiszar Director $4.37M
Campbell C Robert Director $1.25M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

−3.3%

−0.37% a year

Each share's claim on the business

+3.4%

grew without buying or selling a share

Spent on buybacks vs paid in stock

$600M vs $235M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years63% 3–5 years7% 1–3 years11% Under 1 year19%

Quarterly turnover

12.7%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting MTZ on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	7.6M	9.51%	+328.9K (+4.5%)	≤2021	0.1%
Shares held by quarter Peak holding8.2M (Q2'25) Change over 8 quarters+1.6M Share of the company9.510% BlackRock, Inc.'s full portfolio →
PP Peconic Partners LLC	3.7M	4.58%	+100.0K (+2.8%)	Q3 '25	19.0%
Shares held by quarter Peak holding3.7M (Q2'26) Change over 8 quarters+3.7M Share of the company4.580% Peconic Partners LLC's full portfolio →

BlackRock, Inc.

7.6M

% of company

9.51%

Change vs last qtr

+328.9K (+4.5%)

Held since

≤2021

Peconic Partners LLC

3.7M

% of company

4.58%

Change vs last qtr

+100.0K (+2.8%)

Held since

Q3 '25

28 more super investors behind a free account

See every manager holding MasTec Inc, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting MTZ on Form N-PORT; together they hold 29.5% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IC iShares Core S&P Mid-Cap ETF iShares Trust	$877M	2.1M	2.63%	0.71%	June 30, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$835M	2.0M	2.50%	0.04%	June 30, 2026

iShares Core S&P Mid-Cap ETF

iShares Trust

Position value

$877M

% of company

2.63%

% of the fund

0.71%

As of

June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$835M

% of company

2.50%

% of the fund

0.04%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding MasTec Inc and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
JM Jorge Mas 5%+ holder 13D · 14.8%	11.9M	14.78%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company14.780% Disclosed stake13D · 14.8% View the 13D/G filing →
JR Jose Ramon Mas 5%+ holder 13D · 7.7%	6.2M	7.70%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company7.700% Disclosed stake13D · 7.7% View the 13D/G filing →

Jorge Mas

5%+ holder13D · 14.8%

11.9M

% of company

14.78%

Change vs last qtr

—

Held since

—

Jose Ramon Mas

5%+ holder13D · 7.7%

6.2M

% of company

7.70%

Change vs last qtr

—

Held since

—

12 more holders behind a free account

See every insider and 5%+ holder of MasTec Inc.

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