Colliers (NASDAQ: CIGI) ties new 6-K exhibit to Form F-10

Rhea-AI Filing Summary

Colliers International Group Inc. filed a Form 6-K as a foreign private issuer in November 2025. The company states that Exhibit 99.1 to this report will be incorporated by reference as an exhibit to its existing registration statement on Form F-10.

Form 6-K: How Foreign Companies Report to the SEC →

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: November 2025

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]

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 10, 2025		/s/ Christian Mayer
		Name: Christian Mayer
		Title: Chief Financial Officer

EXHIBIT INDEX

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.

FAQ

What did Colliers International Group Inc. (CIGI) file in November 2025?

Colliers International Group Inc. filed a Form 6-K foreign private issuer report. The filing is dated November 2025 and relates to the company’s ongoing reporting obligations under the Securities Exchange Act of 1934 as a foreign private issuer.

How is Exhibit 99.1 in Colliers (CIGI) Form 6-K being used?

Exhibit 99.1 to the Form 6-K will be incorporated by reference as an exhibit to Colliers International Group Inc.’s registration statement on Form F-10, identified as File No. 333-277184, linking this disclosure to that existing registration.

Which annual report form does Colliers (CIGI) use as a foreign issuer?

The filing indicates that Colliers International Group Inc. uses Form 40-F for its annual reports. This aligns with its status as a foreign private issuer that qualifies to report under the multi-jurisdictional disclosure system framework.

Who signed the November 2025 Colliers (CIGI) Form 6-K?

The Form 6-K was signed on behalf of Colliers International Group Inc. by Christian Mayer. His title is Chief Financial Officer, indicating executive-level authorization of the submission under the Securities Exchange Act of 1934.

What is the connection between Colliers (CIGI) Form 6-K and Form F-10?

The Form 6-K explicitly states that its Exhibit 99.1 will be incorporated by reference into Colliers International Group Inc.’s Form F-10 registration statement. This makes the exhibit part of the disclosure record for that Form F-10.