X0306 4 2018-12-27 0 0001287808 Hill International, Inc. HIL 0001293424 Ajdler Arnaud C/O HILL INTERNATIONAL, INC. 2005 MARKET STREET, 17TH FLOOR PHILADELPHIA PA 19103 1 0 0 0 Common Stock 2018-12-27 4 P 0 7500 2.79 A 5555256 I By Engine Capital, L.P. Common Stock 24429 D The price reported in Column 4 is a weighted average price from multiple transactions. The reporting person undertakes to provide to Hill International, Inc., any security holder of Hill International, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price. The Reporting Person is the managing member of Engine Capital Management, L.P. ("Engine Management"), Engine Investments, LLC ("Engine Investments") and Engine Investments II, LLC ("Engine Investments II"). Engine Management is the investment manager of each of Engine Airflow Capital, L.P. ("Engine Airflow"), Engine Capital, L.P. ("Engine Capital"), and Engine Jet Capital, L.P. ("Engine Jet"). Engine Investments is the general partner of each of Engine Capital and Engine Jet, and Engine Investments II is the general partner of Engine Airflow. Following the transaction, Engine Airflow owns 465,064 shares, Engine Capital owns 2,779,054 shares and Engine Jet owns 2,201,138 shares of the Issuer's common stock. The Reporting Person disclaims beneficial ownership in such securities except to the extent of his pecuniary interest therein. Includes 24,429 deferred stock units (DSUs). Each DSU entitles the reporting person to receive one share of the Issuer's common stock following the Reporting Person's retirement or termination of service from the Issuer's Board of Directors. /s/ Arnaud Ajdler 2018-12-31