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UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON , D.C. 20549 FORM 40 - F Registration Statement Pursuant to Section 12 of the Securities Exchange Act of 1934 or Annual Report Pursuant to Section 13 ( a ) or 15 ( d ) of the Securities Exchange Act of 1934 For the fiscal year ended December 31 , 2020 Commission file number 001-36898 Colliers International Group Inc. ( Exact name of Registrant as specified in its charter ) N / A ( Translation of Registrant's name into English ( if applicable ) ) Ontario , Canada ( Province or other jurisdiction of incorporation or organization ) 6500 ( Primary Standard Industrial Classification Code Number ( if applicable ) ) N / A ( I.R.S. Employer Identification Number ( if applicable ) ) 1140 Bay Street , Suite 4000 Toronto , Ontario , Canada M5S 2B4 416-960-9500 ( Address and telephone number of Registrant's principal executive offices ) Mr. Santino Ferrante , Ferrante & Associates 126 Prospect Street , Cambridge , MA 02139 617-868-5000 ( Name , address ( including zip code ) and telephone number ( including area code ) of agent for service in the United States ) Securities registered or to be registered pursuant to Section 12 ( b ) of the Act : Title of each class Subordinate Voting Shares Trading Symbol CIGI Name of each exchange on which registered NASDAQ Stock Market Securities registered or to be registered pursuant to Section 12 ( g ) of the Act : None Securities for which there is a reporting obligation pursuant to Section 15 ( d ) of the Act : None