⌘K

MTZ Institutional Ownership & 13F Holders | SmartMoneyDB

MTZMASTEC INC

COM · CUSIP 576323109

Smart Money Ownership

Of the 15 tracked institutions holding MTZ, 9 have a 3-year clone track record — 7 of them beat the S&P. Average holder's clone alpha: +4.4pt. It's a gauge of who owns the name, not just how many.

Steve Cohen

$139.3M · 0.2% of book

+11.9pt

Philippe Laffont

$187.8M · 0.6% of book

+11.8pt

Ken Griffin

$90.0M · 0.1% of book

+6.7pt

Stephen Mandel

$492.6M · 3.9% of book

MTZ (MASTEC INC) Institutional Ownership Summary

Among the 15 tracked institutional investors we monitor, MTZ (MASTEC INC) is held with a combined value of $5.92B across 20,327,334 shares. The largest holder is BlackRock, Inc. with a position worth $2.35B (0.04% of their portfolio). LONE PINE CAPITAL LLC opened a new position in the most recent quarter. 5 funds increased their holdings. 9 funds reduced their position.

Total Institutional Value

$5.92B

Total Shares Held

20,327,334

Institutional Holders

% of Shares Outstanding

25.7%

of 79.02M shares · SEC 2026-04-27

Days to Cover

4.3-3.8%

4.24M shares short · FINRA 2026-07-15

Tracked 13F institutions hold 25.7% of MTZ's shares outstanding. This is a floor: 13F filings arrive on a ~45-day lag and we track only a subset of institutional filers, so true institutional ownership is higher. Shares-outstanding is the latest SEC cover-page figure (as of 2026-04-27), not a live float.

This Quarter's Biggest Movers

Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.

Biggest Buyers

LONE PINE CAPITAL LLCNew position~$492.6M CITADEL ADVISORS LLC+1216% shares~$83.2M BlackRock, Inc.+3% shares~$64.1M STATE STREET CORP+2% shares~$14.1M Bridgewater Associates, LP+274% shares~$9.5M

13F Institutional Holders

Sort

LONE PINE CAPITAL LLC

3.93% of bookNew

$492.60M

AQR CAPITAL MANAGEMENT LLC

COATUE MANAGEMENT LLC

0.65% of book-13.9%

$187.77M

MILLENNIUM MANAGEMENT LLC

0.07% of book-31.2%

$162.19M

Point72 Asset Management, L.P.

#	Fund	Value↓	Shares	Portfolio %	Change
1	BlackRock, Inc.	$2.35B	7,309,609	0.04%	+2.8%
2	VANGUARD GROUP INC	$1.29B	5,932,754	0.02%	-1.2%
3	STATE STREET CORP	$601.59M	1,869,788	0.02%	+2.4%
4	LONE PINE CAPITAL LLC	$492.60M	1,531,050	3.93%	New
5	AQR CAPITAL MANAGEMENT LLC	$209.54M	660,054	0.10%	-9.7%
6	FMR LLC	$202.02M	627,901	0.01%	-5.5%
7	COATUE MANAGEMENT LLC	$187.77M	583,597	0.65%	-13.9%
8	MILLENNIUM MANAGEMENT LLC	$162.19M	504,099	0.07%	-31.2%
9	Point72 Asset Management, L.P.	$139.33M	433,058	0.24%	-39.9%
10	Third Point LLC	$102.96M	320,000	4.94%	-65.4%

Congress Trading

2 members · 8 disclosed trades in MTZ

Member	Type	Amount	Date
Markwayne Mullin	Sell	$15,001 - $50,000	Feb 4, 2026
Markwayne Mullin	Sell	$15,001 - $50,000	Dec 18, 2025
Lisa McClain	Sell	$1,001 - $15,000	Oct 31, 2025
Lisa McClain	Sell	$1,001 - $15,000

Frequently Asked Questions

Which institutional investors own the most MTZ stock?

As of the latest SEC 13F filings, BlackRock, Inc. is the largest institutional holder of MTZ with a position worth $2.35B, representing 0.04% of their portfolio. In total, 15 institutional investors hold MTZ with a combined value of $5.92B.

Are hedge funds buying or selling MTZ?

In the most recent quarter, 1 fund opened a new position in MTZ. Additionally, 5 increased their holdings and 9 reduced their positions.

What percentage of MTZ is owned by institutional investors?

Institutional investors hold $5.92B worth of MTZ stock across 15 positions. The largest institutional holder is BlackRock, Inc. with $2.35B in holdings.

What is a 13F filing and why does it matter for MTZ?

A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For MTZ, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.

Track MTZ institutional moves

Get notified when hedge funds change their MTZ positions.