SCHEDULE 13G/A: Dimensional Fund Advisors Reports 5.8% Stake in Ducommun

Dimensional Fund Advisors LP has reported a 5.8% beneficial ownership stake in Ducommun Inc. common stock as of September 30, 2025.

Summary

• Dimensional Fund Advisors LP, an investment adviser, holds beneficial ownership of 858,779 shares of Ducommun Inc. common stock.
• This ownership represents 5.8% of the class of securities.
• Dimensional Fund Advisors LP has sole voting power over 845,468 shares and sole dispositive power over 858,779 shares.
• The securities are held in the ordinary course of business and not for the purpose of changing or influencing control of Ducommun Inc.
• Dimensional Fund Advisors LP disclaims beneficial ownership of these securities, as they are owned by the various funds it advises.

Sentiment

Score: 5

Explanation: This filing is a routine disclosure of institutional ownership, providing factual information without inherent positive or negative sentiment regarding the issuer's performance or prospects.

Positives

• Continued significant institutional ownership by Dimensional Fund Advisors LP, a major investment adviser, indicates ongoing institutional interest in Ducommun Inc.

Future Outlook

This filing is a disclosure of current ownership and does not contain any forward-looking statements or guidance regarding Ducommun Inc.'s future performance or outlook.

Management Comments

• Selwyn Notelovitz, Global Chief Compliance Officer for Dimensional Fund Advisors LP, certified that the securities were acquired and are held in the ordinary course of business and not for the purpose of changing or influencing the control of the issuer.

Industry Context

This is a routine institutional ownership disclosure, common for publicly traded companies. It reflects a major investment adviser's passive stake in Ducommun Inc., indicating continued institutional presence in the company's shareholder base.

Stakeholder Impact

• Shareholders receive transparency regarding significant institutional holdings, which can influence market perception and liquidity.

Key Dates

Keywords

Ducommun Inc, Dimensional Fund Advisors, Common Stock, Institutional Ownership, SEC Filing, Schedule 13G, Investment Adviser