MLM (Martin Marietta Materials) Insider Ownership: 1.57 % (As of Jul. 21, 2026)

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MLM Martin Marietta Materials Inc MLM
92 GF Score
Price $547.33
GF Value $658.68
Valuation Modestly Undervalued
! 3 Warning Signs
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What is Martin Marietta Materials Insider Ownership?

Martin Marietta Materials MLM -1.14% 92 Insider Ownership is 1.57 % as of Jul. 21, 2026. GuruFocus rates MLM with a GF Score™ of 92/100 and a GF Value™ of $658.68 (Modestly Undervalued). The stock has 3 warning signs investors should review.

Insider ownership is the percentage of shares that are owned by company insiders relative to the total shares outstanding. As of today, Martin Marietta Materials's insider ownership is 1.57%.

Institutional Ownership is the percentage of shares that are owned by institutions out of the total shares outstanding. As of today, Martin Marietta Materials's Institutional Ownership is 110.61%.

Float Percentage Of Total Shares Outstanding is the percentage of float shares relative to the total shares outstanding. As of today, Martin Marietta Materials's Float Percentage Of Total Shares Outstanding is 87.57%.

Martin Marietta Materials Insider Ownership Historical Data

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The historical data trend for Martin Marietta Materials's Insider Ownership can be seen below:

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

Martin Marietta Materials Insider Ownership Chart

Martin Marietta Materials Historical Data

The historical data trend for Martin Marietta Materials can be seen below:

2025-06-30 2025-07-31 2025-08-31 2025-09-30 2025-10-31 2025-11-30 2026-01-31 2026-02-28 2026-05-31 2026-06-30
Insider Ownership 1.42 1.42 1.43 1.43 1.43 1.43 1.42 1.46 1.57 1.57
MLM
92GF Score
Martin Marietta Materials Inc MLM
Insider Ownership is just one metric. See GF Score™, valuation, warning signs, and more.
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Martin Marietta Materials Insider Ownership Calculation

The percentage of shares that are owned by company insiders relative to the total shares outstanding.

Frequently Asked Questions Learn more about Insider Ownership →
What does a Insider Ownership of 1.57 % mean?
Martin Marietta Materials (MLM) has a Insider Ownership of 1.57 % as of Jul. 21, 2026. Insider ownership equals the percent of shares owned by company insiders relative to total shares. View historical data on Martin Marietta Materials and its competitors.
Is Martin Marietta Materials' Insider Ownership too high?
Martin Marietta Materials' current Insider Ownership is 1.57 %. Overall, Martin Marietta Materials has a GF Score™ of 92/100 and is considered Modestly Undervalued, reflecting its overall financial health beyond just this single metric.
How does Martin Marietta Materials' Insider Ownership compare to VMC and JHX?
Martin Marietta Materials' Insider Ownership of 1.57 % can be compared against companies in the Building Materials industry. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good Insider Ownership for a Building Materials company?
A good Insider Ownership depends on the Building Materials industry context. However, Insider Ownership should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high Insider Ownership mean?
A high Insider Ownership can signal that a stock is expensive relative to its fundamentals. Insider ownership equals the percent of shares owned by company insiders relative to total shares. View historical data on Martin Marietta Materials and its competitors. Martin Marietta Materials's current Insider Ownership is 1.57 %. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Martin Marietta Materials stock overvalued right now?
Based on GuruFocus' analysis, Martin Marietta Materials (MLM) is currently considered Modestly Undervalued. The stock's GF Value™ is $658.68, compared to a current price of $547.33 — trading 16.9% below its estimated fair value. The current Insider Ownership is 1.57 %. Martin Marietta Materials' overall GF Score™ is 92/100 with 3 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is Insider Ownership calculated?
Insider Ownership is calculated from a company's financial statements. For Martin Marietta Materials (MLM), the current Insider Ownership is 1.57 % as of Jul. 21, 2026. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.

Is Martin Marietta Materials (MLM) Overvalued in 2026?

Based on GuruFocus' analysis, Martin Marietta Materials stock appears to be undervalued. The current stock price of $547.33 is trading 16.9% below its estimated GF Value™ of $658.68. GuruFocus considers Martin Marietta Materials to be Modestly Undervalued.

Key valuation signals for MLM:

  • Insider Ownership: 1.57 %
  • GF Value™: $658.68 vs. price of $547.33 (16.9% below fair value)
  • GF Score™: 92/100 with 3 warning signs

No single metric tells the full story. See the MLM stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.

Martin Marietta Materials Business Description

Address 4123 Parklake Avenue, Raleigh, NC, USA, 27612
Martin Marietta Materials is one of the United States' largest producer of construction aggregates (crushed stone, sand, and gravel). In 2024, Martin Marietta sold 191 million tons of aggregates. Martin Marietta's most important markets include Texas, North Carolina, Colorado, California, and Georgia, accounting for most of its sales. The company also uses its aggregates in its asphalt and ready-mixed concrete businesses. Martin's magnesia specialties business produces magnesia-based chemical products and dolomitic lime.
92GF Score

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Insider Ownership is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.

$547.33
Price
$658.68
GF Value