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, 2026

Commission File Number 001-39349

DoubleDown Interactive Co., Ltd.

(Translation of registrant’s name into English)

Joseph A. Sigrist, Chief Financial Officer

c/o DoubleDown Interactive LLC

6671 S. Las Vegas Blvd.

Building D, Suite 210

Las Vegas, Nevada 89119

+1-702-761-6899

(Address of principal executive offices)

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

INFORMATION CONTAINED IN THIS REPORT ON FORM 6-K

Issuance of Press Release

On June 1, 2026, DoubleDown Interactive Co., Ltd. (the “Company”) issued a press release announcing a $10,000 donation to the American Cancer Society to promote health awareness during National Cancer Survivors Month.

The press release being furnished in this report as Exhibit 99.1 shall not be deemed to be “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, as amended, except to the extent specifically provided in such a filing.

EXHIBIT INDEX

Exhibit No.		Description
99.1		Press release of the Company, dated June 1, 2026

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.

	DOUBLEDOWN INTERACTIVE CO., LTD.
Date: June 1, 2026	By:	/s/ Joseph A. Sigrist
		Name: Joseph A. Sigrist
		Title: Chief Financial Officer

EX-99.1

Exhibit 99.1

DoubleDown Interactive to Donate

$10,000 to the American Cancer Society

SEATTLE WASHINGTON – June 1, 2026 (GLOBE NEWSWIRE) — DoubleDown Interactive Co., Ltd. (NASDAQ: DDI) (“DoubleDown” or the “Company”), a leading developer and publisher of digital games on mobile and web-based platforms, announced today a $10,000 donation to the American Cancer Society (ACS) in support of their mission to spread awareness about health screenings and healthy lifestyles during National Cancer Survivors Month.

DoubleDown Casino, which is played daily by millions of fans worldwide on both desktop and mobile devices, will invite players to engage with and show support for the charitable donation by taking part in a play-to-enter giveaway on June 6, 2026. This event, Strive to Thrive, offers players the chance to express their enthusiasm for the work the American Cancer Society does as well as engage with information about cancer prevention, detection, and survival.

“It is always an honor to be able to support the American Cancer Society for a cause we know is important to many of our players,” said In Keuk Kim, CEO of DoubleDown. “We are proud to be able to make this contribution and help spread awareness during National Cancer Survivors Month.”

“Hope lives in the moments when communities come together to make a difference,” said Jessica Silva, Vice President PNW & Alaska with the American Cancer Society. “We’re thankful to DoubleDown Interactive for helping shine a light on cancer prevention and survivorship during this important month.”

Visit the American Cancer Society website: https://www.cancer.org/

Follow the latest activity on our social media pages:

Facebook: https://www.facebook.com/doubledowncasino

Instagram: https://www.instagram.com/doubledowncasino

TikTok: https://www.tiktok.com/@doubledowncasino

YouTube: https://www.youtube.com/@DoubleDownCasino

About DoubleDown

DoubleDown Interactive Co., Ltd. is a leading developer and publisher of digital games on mobile and web-based platforms. We are the creators of multi-format interactive entertainment experiences for casual players, bringing authentic Vegas entertainment to players around the world through an online social casino experience. The Company’s flagship social casino title, DoubleDown Casino, has been a fan-favorite game on leading social and mobile platforms for years, entertaining millions of players worldwide with a lineup of classic and modern games. The Company’s subsidiary, SuprNation, also operates three real-money iGaming sites in Western Europe while the newly acquired subsidiary, WHOW Games, operates social casino gaming business in Europe, mainly in Germany.

About the American Cancer Society

The American Cancer Society is a leading cancer-fighting organization with a vision to end cancer as we know it, for everyone. For more than 110 years, we have been improving the lives of people with cancer and their families as the only organization combating cancer through advocacy, research, and patient support. We are committed to ensuring everyone has an opportunity to prevent, detect, treat, and survive cancer. To learn more, visit cancer.org or call our 24/7 helpline at 1-800-227-2345. Connect with us on Facebook, X, and Instagram.

Safe Harbor Statement

Certain statements contained in this press release are “forward-looking statements” about future events and expectations. These statements are often identified by words such as “will,” “expects,” “plans,” “believes,” “anticipates,” or similar expressions. Forward-looking statements are based on management’s current assumptions and are not guarantees of future performance. They are subject to significant business, economic, and regulatory risks and uncertainties that could cause actual results to differ materially from our current expectations. We assume no obligation to update or revise any forward-looking statements, whether as a result of new information, future events, or otherwise. The information contained in, or that can be accessed through, our social media pages is not incorporated by reference into, and is not a part of, this press release. We have included our social medial pages in this press release solely for informational purposes.

Company Contact:

Joe Sigrist

ir@doubledown.com

+1 (206) 408-7545

Chief Financial Officer

https://www.doubledowninteractive.com

Investor Relations Contact:

Joseph Jaffoni or Christin Armacost

JCIR

+1 (212) 835-8500

DDI@jcir.com