UNITED ~~STATESSECURITIES AND EXCHANGE COMMISSIONWashington, D.C. 20549~~STATES

~~Form~~SECURITIES ~~6-K~~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 ~~the~~SECURITIES ~~month~~EXCHANGE ofACT ~~November~~OF ~~2025Commission File Number: 001-36898~~1934

~~COLLIERS~~For ~~INTERNATIONAL~~the ~~GROUP~~month ~~INC.(Translation~~ of: ~~registrant's~~November ~~name into English)~~2025

~~1140~~Commission ~~Bay~~file ~~Street,~~number ~~Suite 4000 Toronto, Ontario, Canada M5S 2B4(Address of principal executive office)~~001-36898

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

(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]

Exhibit 99.1 of this Form 6-K shall be incorporated by reference as an exhibit to the registrant’s registration statement on Form F-10 (File No. 333-277184).

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, hereunto duly authorized.

		COLLIERS INTERNATIONAL GROUP INC.
Date: November 4, 2025		/s/ Christian Mayer
Date: November 10, 2025		/s/ Christian Mayer
		Name: Christian Mayer
		Title: Chief Financial Officer

EXHIBIT INDEX

Exhibit		Description of Exhibit
99.1		Press release dated November 4, 2025 announcing financial results for the third quarter ended September 30, 2025.
99.2		Supplemental slide presentation dated November 4, 2025.

Exhibit

Description of Exhibit

99.1

Interim consolidated financial statements and management’s discussion & analysis for the three-month and nine-month periods ended September 30, 2025.

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