FRONTIER CAPITAL MANAGEMENT CO LLC MTZ — MASTEC INC COM

Ownership history in FRONTIER CAPITAL MANAGEMENT CO LLC  ·  74 quarters on record

AI Ownership Summary

FRONTIER CAPITAL MANAGEMENT CO LLC reported MASTEC INC COM (MTZ) in 74 quarterly 13F filings from 2023 Q4 through 2025 Q3. Peak portfolio weight reached 0.8% in 2023 Q4. The latest visible filing shows MTZ at 0.10% of the fund.

This page tracks quarterly shares, estimated market value, portfolio weight, filing dates, and disclosure-aligned stock prices directly from SEC EDGAR 13F filings. Older history is available after unlock; the visible window still shows the most recent pattern.

What this MTZ ownership page tells you

This page is designed to answer the real investor question behind a 13F filing: how meaningful was FRONTIER CAPITAL MANAGEMENT CO LLC's position in MASTEC INC COM, and how did that conviction change over time? You can read the holding window, peak weight, latest reported size, disclosure timing, and quarter-by-quarter changes without piecing the story together from raw SEC rows.

Freshest filing
Latest Reported Filing
2025 Q3

MTZ was reported at 0.10% of portfolio in the most recent visible filing.

High-water mark
Peak Conviction
0.8% in 2023 Q4

Peak weight helps separate a token disclosure from a real conviction holding the fund genuinely cared about.

Time in book
Holding Window
2023 Q4 to 2025 Q3

Longer holding windows often tell a very different story from short-lived tactical trades or one-quarter experiments.

Decision context
Why It Matters
Position size beats headlines

Knowing that a fund owned a stock is useful. Knowing whether it was a 0.20% placeholder or a true high-conviction position is where the signal actually starts.

MTZ stock page FRONTIER CAPITAL MANAGEMENT CO LLC fund profile FRONTIER CAPITAL MANAGEMENT CO LLC full holdings
How FRONTIER CAPITAL MANAGEMENT CO LLC held MTZ — position size vs. price
% of Fund (quarterly)    MTZ price (quarter-end, indexed to 100)    SPY (indexed to 100)    QQQ (indexed to 100)
📋 Quarterly Holdings History 8 quarters  ▾
Quarter Action Sold % After 3M Timing Shares Change Chg % % of Fund Mkt Value Filed Price (Filed)
2025 Q3 REDUCED 35.8% +4.7% ❌ 53,702 -29,959 -35.8% 0.10% $11.4M 2025-11-14 $192.22
2025 Q2 REDUCED 26.3% +22.9% ❌ 83,661 -29,915 -26.3% 0.13% $14.3M 2025-08-14 $178.00
2025 Q1 REDUCED 26.4% +46.0% ❌ 113,576 -40,793 -26.4% 0.14% $13.3M 2025-05-15 $155.61
2024 Q4 REDUCED 13.3% -14.3% ✅ 154,369 -23,606 -13.3% 0.20% $21.0M 2025-02-14 $135.78
2024 Q3 REDUCED 49.3% +10.3% ❌ 177,975 -172,901 -49.3% 0.21% $21.9M 2024-11-14 $137.40
2024 Q2 REDUCED 16.1% +15.1% ❌ 350,876 -67,537 -16.1% 0.37% $37.5M 2024-08-14 $108.73
2024 Q1 REDUCED 59.8% +10.5% ❌ 418,413 -623,455 -59.8% 0.36% $39.0M 2024-05-15 $106.99
2023 Q4 ADDED — — — 1,041,868 +312,991 +42.9% 0.80% $78.9M 2024-02-14 $72.78
66 older quarters hidden  —  Sign in free or upgrade to Premium to see full history

🏢 Other funds also holding MTZ

As of 2026 Q1 — sorted by position size

HILLMAN CO 3Y 7Y 18.1% KIRR MARBACH & CO LLC /IN/ 3Y 7Y 9.39% HENNESSY ADVISORS INC 3Y 7Y 2.38% COMMUNITY TRUST & INVESTMENT CO 3Y 7Y 1.92% Bouvel Investment Partners, LLC 3Y 1.89% Retireful, LLC 3Y 1.28% Trivium Point Advisory, LLC 3Y 7Y 1.15% CUSHING ASSET MANAGEMENT, LP dba NXG INVESTMENT MANAGEMENT 3Y 7Y 1.13% KRS Capital Management, LLC 3Y 1.07% Monument Capital Management 3Y 7Y 0.92%

FAQ About FRONTIER CAPITAL MANAGEMENT CO LLC and MTZ

These are the practical questions this page is built to answer before you even open the full history table.

How long has FRONTIER CAPITAL MANAGEMENT CO LLC reported owning MTZ?

FRONTIER CAPITAL MANAGEMENT CO LLC reported MTZ across 8 quarterly 13F filings, from 2023 Q4 through 2025 Q3.

What was the largest reported MTZ position in FRONTIER CAPITAL MANAGEMENT CO LLC's portfolio?

The largest reported portfolio weight for MTZ was 0.80% in 2023 Q4.

What is the latest reported MTZ position on this page?

The most recent filing on this page is 2025 Q3, when FRONTIER CAPITAL MANAGEMENT CO LLC reported 53,702 shares, equal to 0.10% of portfolio, with an estimated market value of $11.4M.

What does the chart on this MTZ ownership page compare?

The chart compares FRONTIER CAPITAL MANAGEMENT CO LLC's quarterly MTZ portfolio weight with the stock's indexed share price, so you can see whether the fund was building, trimming, or holding the position as price moved.

How well did FRONTIER CAPITAL MANAGEMENT CO LLC time their MTZ position?

Based on 13F filing dates vs. subsequent MTZ price moves, FRONTIER CAPITAL MANAGEMENT CO LLC correctly timed 34 out of 73 reported position changes (47%). The annualised alpha on MTZ relative to SPY over the holding period was +4.2%.

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