X0306 4 2020-02-27 0 0000030305 DUCOMMUN INC /DE/ DCO 0001695904 Oswald Stephen G 200 SANDPOINTE AVENUE SUITE 700 SANTA ANA CA 92707-5759 1 1 0 0 Chairman, President & CEO Common Stock 2020-02-27 4 P 0 10000 44.11 A 147150 D The acquired securities were purchased in multiple transactions at prices ranging from $43.78 to $44.98, inclusive. The price reported above represents the weighted average purchase price of the transactions. Upon request, the reporting person hereby undertakes to provide to the staff of the Securities and Exchange Commission, the Issuer, or any security holder of the Issuer, full information regarding the number of shares purchased and the price at which each transaction was effected. Stephen G. Oswald 2020-03-02