Vanguard Portfolio Management LLC filed an amended beneficial ownership statement with the SEC on October 30, 2026, disclosing its holdings in Martin Marietta Materials Inc common stock as of the September 30, 2026 event date.

Key Highlights

  • Aggregate beneficial ownership: Vanguard Portfolio Management reported holding 3,304,239 shares of Martin Marietta Materials Inc common stock, representing 4.65% of the class.
  • Sole voting power: Vanguard Portfolio Management disclosed sole power to vote or direct the vote of 7,194 shares.
  • Sole dispositive power: The filing reported sole power to dispose of, or direct the disposition of, all 3,304,239 shares.
  • Shared voting and dispositive power: Both shared voting power and shared dispositive power were reported as 0 shares.
  • Event date: The filing was triggered by an ownership event dated September 30, 2026, and signed October 30, 2026.
  • Affiliates included: The filing states the reported shares reflect securities beneficially owned by Vanguard Portfolio Management LLC and affiliates Vanguard Fiduciary Trust Company and Vanguard Global Advisers, LLC.

Vanguard Portfolio Management's Reported Position in Martin Marietta Materials

According to the filing, Vanguard Portfolio Management LLC, organized in Pennsylvania and operating as an investment adviser, disclosed an aggregate beneficial ownership of 3,304,239 shares of Martin Marietta Materials Inc (NYSE:MLM) common stock, equal to 4.65% of the outstanding class. Martin Marietta Materials Inc, headquartered at 4123 Parklake Avenue, Raleigh, NC 27612, is the issuer of the common stock covered by this filing, which carries CUSIP number 573284106.

The filing notes that the reported position covers securities held by Vanguard funds, or sleeves thereof, over which Vanguard Portfolio Management LLC exercises dispositive power, as well as securities held by clients over which affiliated entities exercise dispositive and voting power. Specifically, the filing states the position reflects holdings attributed to Vanguard Portfolio Management LLC together with Vanguard Fiduciary Trust Company and Vanguard Global Advisers, LLC. The filing further states that securities beneficially owned by other subsidiaries or affiliates whose ownership is disaggregated under SEC Release No. 34-39538 (January 12, 1998) are not included in this report.

On the question of voting authority, the filing reported sole voting power over only 7,194 shares, while the remaining shares carried no shared voting power. Regarding the receipt of dividends or sale proceeds, the filing disclosed that Vanguard Portfolio Management, including registered investment companies and other managed accounts, holds the right to receive or direct such proceeds, and that no single other person's interest in the reported securities exceeds 5% of the class. The filing was signed by My Trieu-Gatt, identified as Authorized Signatory and Head of Global Fund Administration, on October 30, 2026.

What Was Disclosed

Vanguard Portfolio Management LLC filed an amended beneficial ownership report covering 3,304,239 shares of Martin Marietta Materials Inc common stock, equal to 4.65% of the class, with a triggering event date of September 30, 2026, and a filing date of October 30, 2026.