As of June 2025, 74.56% is owned by Indian Promoters and 25.44% by Public.
Top three Promoters holding highest number of shares of Duncan Engineering company are Ag Ventures Limited (Formerly Known As Oriental Carbon & Chemicals Ltd) (18.49 lakhs shares / 50.01%), Cosmopolitan Investments Private Ltd (Formerly Known As Cosmopolitan Investments Ltd) (9.05 lakhs shares / 24.50%) and Duncan International (India) Limited (2019 shares / 0.05%).