SK hynix Inc.

(Translation of registrant's name into English)

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 ☐

SK hynix Inc. (the "Company") plans to hold a conference call for the 2026 3Q earnings results as follows: 1. Agenda

2. Date and Time October 28, 2026 9:00 a.m. (Seoul Time)

Real-time access to the call via webcast (in Korean and English simultaneously) and an archive of the call will be available on the Company's Investor Relations website ( https://www.skhynix.com ® IR ® Financial Information ® Earnings Release). The materials for the Company's conference call will be available on its Investor Relations website on October 28, 2026 (Seoul time).