Exhibit 21.1
List of Subsidiaries of SK hynix Inc.
(As of March 31, 2026)
| Subsidiary Name |
Jurisdiction of Incorporation | |
| SK hyeng Inc. | Korea | |
| SK hystec Inc. | Korea | |
| Happymore Inc. | Korea | |
| SK hynix system ic Inc. | Korea | |
| HappyNarae Co., Ltd. | Korea | |
| SK Keyfoundry Inc. | Korea | |
| SK hynix America Inc. | U.S.A. | |
| SK hynix Deutschland GmbH | Germany | |
| SK hynix Asia Pte. Ltd. | Singapore | |
| SK hynix Semiconductor Hong Kong Ltd. | Hong Kong | |
| SK hynix U.K. Ltd. | U.K. | |
| SK hynix Semiconductor Taiwan Inc. | Taiwan | |
| SK hynix Japan Inc. | Japan | |
| SK hynix (Wuxi) Semiconductor Sales Ltd. | China | |
| SK hynix Semiconductor (China) Ltd. | China | |
| SK hynix memory solutions Taiwan Ltd. | Taiwan | |
| SK APTECH Ltd. | Hong Kong | |
| SK hynix Ventures Hong Kong Ltd. | Hong Kong | |
| Gauss Labs Inc. | U.S.A. | |
| SK hynix NAND Product Solutions Corp. | U.S.A. | |
| SK hynix Semiconductor (Dalian) Co., Ltd. | China | |
| SK hynix memory solutions Poland sp. z o.o. | Poland | |
| SK Keyfoundry America Inc. | U.S.A. | |
| SK Keyfoundry Shanghai Co., Ltd. | China | |
| SK Powertech | Korea | |
| SUZHOU HAPPYNARAE Co., Ltd. | China | |
| HappyNarae America LLC | U.S.A. | |
| HappyNarae Hungary Kft | Hungary | |
| SK hynix Semiconductor (Chongqing) Ltd. | China | |
| SK hynix (Wuxi) Education Service Development Co., Ltd. | China | |
| SK hynix (Wuxi) Industry Development Ltd. | China | |
| SK hynix Happiness (Wuxi) Hospital Management Ltd. | China | |
| SK hynix cleaning (Wuxi) Ltd. | China | |
| SK hynix (Wuxi) Education Technology Co., Ltd. | China | |
| SK hynix Semiconductor West Lafayette LLC | U.S.A. | |
| SK hynix memory solutions America Inc. | U.S.A. | |
| SK hynix Semiconductor India Private Ltd. | India | |
| Solidigm Inc. | U.S.A. | |
| SK hynix NAND Product Solutions Taiwan Co., Ltd. | Taiwan | |
| SK hynix NAND Product Solutions Canada Ltd. | Canada | |
| SK hynix NAND Product Solutions Mexico, S. DE R.L. DE C.V. | Mexico | |
| SK hynix NAND Product Solutions UK Limited | U.K. | |
| SK hynix NAND Product Solutions Israel Ltd. | Israel | |
| SK hynix NAND Product Solutions International LLC | U.S.A. | |
| SK hynix NAND Product Solutions Asia Pacific LLC | U.S.A. | |
| SK hynix NAND Product Solutions Singapore Pte. Ltd. | Singapore | |
| SK hynix NAND Product Solutions Malaysia Sdn. Bhd. | Malaysia | |
| SK HYNIX NAND PRODUCT SOLUTIONS POLAND sp. z o.o. | Poland | |
| SK hynix NAND Product Solutions (Beijing) Co., Ltd. | China | |
| SK Hynix NAND Product Solutions (Shanghai) Co., Ltd. | China | |
| Intel NDTM US LLC | U.S.A. | |
| SK hynix (Wuxi) Investment Ltd. | China | |
| SK hynix semiconductor storage technology (Dalian) Co., Ltd. | China | |
| CHONGQING HAPPYNARAE Co., Ltd. | China | |
| MMT (Money Market Trust) | Korea |