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UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FORM 10 - K Delaware ( State or Other Jurisdiction of Incorporation or Organization ) Title of Each Class Common Stock , $ .01 par value HEIDRICK & STRUGGLES INTERNATIONAL , INC . ( Exact Name of Registrant as Specified in its Charter ) Commission File No. 0-25837 233 South Wacker Drive , Suite 4900 , Chicago , Illinois 60606-6303 ( Address of principal executive offices ) ( Zip Code ) ( 312 ) 496-1200 ( Registrant's telephone number , including area code ) Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol HSII 36-2681268 ( I.R.S. Employer Identification Number ) Securities registered pursuant to Section 12 ( g ) of the Act : None Name of Each Exchange On Which Registered The Nasdaq Stock Market Indicate by check mark if the registrant is a well - known seasoned issuer as defined in Rule 405 of the Securities Act . Yes Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 of Section 15 ( d ) of the Act . Yes No | 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 No " No | 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 ( §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 No Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . Yes 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 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 Emerging growth company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . ¨ DOCUMENTS INCORPORATED BY REFERENCE Accelerated Filer Smaller reporting company Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( ( 15. U.S. C 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Yes > No X No 区 The aggregate market value of the registrant's Common Stock held by non - affiliates ( excludes shares held by executive officers , directors and beneficial owners of 10 % or more of the registrant's outstanding Common Stock ) on June 30 , 2020 was approximately $ 356,598,123 based upon the closing market price of $ 21.62 on that date of a share of Common Stock as reported on the Nasdaq Global Stock Market . As of February 22 , 2021 , there were 19,359,586 shares of the Company's Common Stock outstanding .