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☑ ப UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 FORM 10 - Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30 , 2021 or TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 Delaware from For the transition period to Commission File Number : 001-33961 HILL INTERNATIONAL , INC . ( Exact name of registrant as specified in its charter ) ( State or other jurisdiction of incorporation or organization ) One Commerce Square 2005 Market Street , 17th Floor Philadelphia ( Address of principal executive offices ) PA 20-0953973 ( I.R.S. Employer Identification No. ) 19103 ( Zip Code ) Registrant's telephone number , including area code : ( 215 ) 309-7700 Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common Stock , par value $ 0.0001 Trading Symbol ( s ) HIL Name of each exchange on which registered New York Stock Exchange ( NYSE ) Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes ý No o Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( Section 232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes ý No o Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , smaller reporting company , or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act Large Accelerated Filer ☐ Non - Accelerated Filer Accelerated Filer Smaller Reporting Company Emerging Growth Company ☐ × ☑