144 0001815573 XXXXXXXX LIVE 0001799567 DoubleDown Interactive Co., Ltd. 001-39349 13F, GANGNAM FINANCE CENTER 152, TEHERAN-RO GANGNAM-GU SEOUL M5 06236 822-501-7216 STIC Special Situation Diamond Ltd. Owner 10% Shareholder Common Shares, Par value KRW10,000 per share(1) B. Riley Securities, Inc.

11100 Santa Monica Blvd. Suite 800 Los Angeles CA 90025

24775 6292850.00 2477672 07/08/2024 NASDAQ Common Shares, Par value KRW10,000 per share(2) 05/25/2020 2.5% Convertible Bonds converted to Common Shares(2) Issuer: DoubleDown Interactive Co., Ltd. N 24775 05/26/2017 Cash(2) Y (1) Up to 495,500 American Depositary Shares ("ADSs"), each representing 0.05 share of a common share for an aggregate of 24,775 common shares, are expected to be sold. "Number of Shares Outstanding" is based on common shares outstanding as of March 31, 2024. "Aggregate Market Value" calculated on the closing price of ADSs on July 3, 2024, which was $12.70. The ADSs are expected to be sold between July 8, 2024 and October 6, 2024. (2) On May 26, 2017, STIC Special Situation Diamond Ltd. purchased the Issuer's 2.5% Convertible Bonds (the "Bonds") in cash. The Bonds converted into common shares at a conversion price of KRW293,600 per common share for a total of 715,258 common shares in May and June of 2020. 07/05/2024 /s/ Jin Ho Chai, Director of STIC Special Situation Diamond Ltd.