DoubleDown Interactive Co., Ltd. — Interim / Quarterly Report 2025

Aug 12, 2025

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

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FORM 6-K

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REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of August, 2025

Commission File Number 001-39349

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DoubleDown Interactive Co., Ltd.

(Translation of registrant’s name into English)

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Joseph A. Sigrist, Chief Financial Officer

c/o DoubleDown Interactive, LLC

605 5th Avenue, Suite 200

Seattle, WA 98104

+1-206-408-4545

(Address of principal executive offices)

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

x Form 20-F o Form40-F

INFORMATION CONTAINED IN THIS FORM 6-K REPORT

Issuance of Press Release

On August 12, 2025, DoubleDown Interactive Co., Ltd. (the “ Company ”) issued a press release announcing its unaudited financial results for the second quarter ended June 30, 2025, together with its unaudited condensed consolidated interim financial statements for the three and six months ended June 30, 2025.

This report on Form 6-K is hereby incorporated by reference into the Company’s Registration Statement on Form F-3 (File No. 333-267422), to be a part thereof from the date on which this report is submitted, to the extent not superseded by documents or reports subsequently filed or furnished.

EXHIBIT INDEX

Exhibit No.	Description
99.1	Press release of the Company, dated August 12, 2025
99.2	Unaudited condensed consolidated interim financial statements of the Company for the three and six months ended June 30 , 2025
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document
104	Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

SIGNATURES

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.

Date: August 12, 2025
By:	/s/ Joseph A. Sigrist
	Name: Joseph A. Sigrist
	Title: Chief Financial Officer