Dimensional Fund Advisors LP Reports 3.4% Stake in Ducommun Inc (DCO)

Dimensional Fund Advisors LP filed a Schedule 13G/A on April 9, 2026, reporting a 3.4% stake in Ducommun Inc (DCO). As of the event date of March 31, 2026, the firm beneficially owns 512,167 shares of common stock. Dimensional Fund Advisors LP, an investment adviser, possesses sole voting power over 498,656 shares and sole dispositive power over all 512,167 shares. The filing specifies that these securities are owned by various registered investment companies, trusts, and separate accounts for which Dimensional serves as an investment manager or sub-adviser. Notably, the firm disclaims beneficial ownership of these securities, asserting they were acquired in the ordinary course of business without the intent to influence or change the control of the issuer. This amendment reflects an increase from a previously reported zero position, though the filing is categorized as an amendment (13G/A) under Rule 13d-1(b). No single fund within the group holds more than 5% of the class.