6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of: June 2022 Commission File Number: 001-36898

COLLIERS INTERNATIONAL GROUP INC. (Translation of registrant's name into English)

1140 Bay Street, Suite 4000 Toronto, Ontario, Canada M5S 2B4 (Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F. Form 20-F [   ]      Form 40-F [ X ]

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): [   ]

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): [   ]

Indicate by check mark whether by furnishing the information contained in this Form, the Registrant is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934:

Yes [  ]                                                    No [X]

If “Yes” is marked, indicate the file number assigned to the Registrant in connection with Rule 12g3-2(b):  N/A

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

EXHIBIT INDEX

EdgarFiling EXHIBIT 99.1

Colliers completes investment in leading infrastructure investment firm

TORONTO, LONDON, and NEW YORK, June 02, 2022 (GLOBE NEWSWIRE) -- Leading diversified professional services and investment management company, Colliers (NASDAQ and TSX: CIGI), announced today the completion of its strategic investment in Basalt Infrastructure Partners LLP (“Basalt”), a leading transatlantic infrastructure investment management firm with more than $8.5 billion of assets under management.

About Colliers

Colliers (NASDAQ, TSX: CIGI) is a leading diversified professional services and investment management company. With operations in 62 countries, our 17,000 enterprising professionals work collaboratively to provide expert real estate and investment advice to clients. For more than 27 years, our experienced leadership with significant inside ownership has delivered compound annual investment returns of 20% for shareholders. With annual revenues of $4.3 billion and $65 billion of assets under management, Colliers maximizes the potential of property and real assets to accelerate the success of our clients, our investors, and our people.  Learn more at corporate.colliers.com, Twitter @Colliers or LinkedIn.

About Basalt

Basalt is the exclusive investment advisor to the Basalt funds, comprising Basalt I, Basalt II, and Basalt III. The Basalt funds are infrastructure equity investment funds focusing on mid-market investments in utilities, power, transport, and communications infrastructure in North America and Europe.

For more information, please visit www.basaltinfra.com.

Non-GAAP Measures

We use the term assets under management (“AUM”) as a measure of the scale of our Investment Management operations. AUM is defined as the gross market value of operating assets and the projected gross cost of development properties of the funds, partnerships and accounts to which we provide management and advisory services, including capital that such funds, partnerships and accounts have the right to call from investors pursuant to capital commitments. Our definition of AUM may differ from those used by other issuers and as such may not be directly comparable to similar measures used by other issuers.

COMPANY CONTACTS:

Christian Mayer Chief Financial Officer (416) 960-9500