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Company profile

Martin Marietta Materials Inc Insider Trading

MLM

Every SEC Form 4 insider trading filing for Martin Marietta Materials Inc (MLM) since April 2023: open-market buys and sells by directors and officers, option exercises, and cluster activity, updated as each filing is reported to the SEC. Why 2023?

Exchange
NYSE
Sector
Mining & Quarrying of Nonmetallic Minerals (No Fuels)
CIK
0000916076
Filings
171
Insiders
27
Last filing
2026-09-01
SEC EDGAR ↗Yahoo Finance ↗Finviz ↗Stock Analysis ↗

Activity summary

Recent insider activity is bullish. Over the last 30 days, 4 insiders purchased shares (net $110K). Buying was led by David C Wajsgras.

Three year balance

Buy and sell value by quarter, Q4 23 to Q3 26. Martin Marietta Materials Inc insiders are net sellers across the period shown.

PurchasesSales
Q4 23$32.3MQ1 24Q2 24Q3 24Q4 24Q1 25Q2 25Q3 25Q4 25Q1 26Q2 26Q3 26

Bars below the rule are sales, above are purchases. Largest quarter on the chart is $32.3M.

90 day insight

Over the last 90 days, Martin Marietta Materials Inc insiders bought $110K (5 transactions) and sold $200K (1 transaction).

  • Most active insider: Michael J Petro with 2 transactions totaling $200K.
  • Largest single sale: $200K by Michael J Petro on Aug 3, 2026.

Activity skews bullish: buys outpace sales.

Insider Transactions

Sourced from SEC EDGAR Form 4 filings. Updated hourly.

DateInsiderCompanyTypeSharesPriceValueReturn
Sep 1, 2026Michael J PetroMLM
Award
9,331——-2.8% 1w
Aug 31, 2026Martin J LyonsMLM
Award
68$518.70$35K-2.8% 1w
Aug 31, 2026Thomas PikeMLM
Award
66$518.70$34K-2.8% 1w
Aug 31, 2026David C WajsgrasMLM
Award
78$518.70$40K-2.8% 1w
Aug 21, 2026Philipp NiemannMLM
Award
337——-5.0% 1w

45 more transactions hidden

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Top insiders

By total value filed.

C Howard NyeChairman, Pres & CEO4 filings−$7.3M
Michael J PetroSVP and CFO4 filings−$915K
Robert J CardinSr. VP, Controller and CAO3 filings−$763K
Jason Paul FlynnSVP and CIO4 filings+$112K
Donald A. McCunniffEVP and CHRO1 filing−$131K

Institutional Ownership

Top 13F-HR holders of Martin Marietta Materials Inc as of 2026-06-30

↓ decreasing
Total reported AUM
$10.87B
QoQ change
-62.6%
Reporting period
2026-06-30
#1
State Street Corp
CIK 0000093751
$1.82B
3.2M shares
#2
Principal Financial Group Inc
CIK 0001126328
$1.16B
2.0M shares
#3
BlackRock, Inc.
CIK 0002012383
$1.13B
2.0M shares

Data source: quarterly 13F-HR filings: institutional holders report positions within 45 days of quarter end. Joined with insider activity above: see who's loading up institutionally while insiders are trading. Full 13F-HR API →

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Form4API, StockholmNot affiliated with the SEC or EDGAR. Data sourced from public EDGAR filings. Not investment advice.

Congressional Trading

Disclosed MLM trades under the STOCK Act

Total trades
14
Purchases
9
Sales
5
April McClain Delaney
Unknown · House · MD
7 buys
2 sells
Val T. Hoyle
Democrat · House · OR
1 buy
1 sell
Lisa C. McClain
Republican · House · MI
1 buy
1 sell
Josh Gottheimer
Democrat · House · NJ
0 buys
1 sell

Sourced from U.S. House Clerk periodic transaction reports (House coverage only). Trade counts reflect disclosed filings only. The STOCK Act allows up to 45 days between a trade and its disclosure, so this reflects recent disclosures, not real-time trading. Full congressional trading API →

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