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 ~~of:~~ACT ~~March~~OF ~~2026Commission File Number: 001-36898~~1934

~~COLLIERS~~For ~~INTERNATIONAL~~the ~~GROUP~~month ~~INC.(Translation~~ of: ~~registrant's~~March ~~name into English)~~2026

~~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]

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~~hereunto duly authorized.

	COLLIERS INTERNATIONAL GROUP INC.	~~COLLIERS INTERNATIONAL GROUP INC.~~
Date: March 25, 2026		/s/ Christian Mayer
Date: March 27, 2026	/s/ Christian Mayer
	Name: Christian Mayer	~~Name: Christian Mayer~~
	Title: Chief Financial Officer	~~Title: Chief Financial Officer~~

EXHIBIT INDEX

Exhibit	Description of Exhibit	~~Description of Exhibit~~
99.1	Note purchase agreement dated as of March 25, 2026.	~~Press release dated March 25, 2026.~~
99.2	Seventh amendment dated as of March 25, 2026 to note purchase agreement dated as of May 17, 2018
99.3	Second amendment dated as of March 25, 2026 to note purchase agreement dated as of July 28, 2021
99.4	Fifth amendment to sustainability linked third amended and restated credit agreement dated February 20, 2026

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