Annual Large Business Group Status Filing (SK Group Affiliate) — ISC

Summary

ISC filed its annual large business group status disclosure as a member of the SK Group, chaired by Chey Tae-won. The filing reports FY2024 standalone revenue of KRW 182.2 billion, operating profit of KRW 47.7 billion, and net income of KRW 48.0 billion, with a low debt-to-equity ratio of 13.24%. Affiliate changes include the additions of Tech Dream (Hong Kong) via share acquisition and absorption mergers of ITMTC and ISEMI, plus the divestiture of SMATECH and liquidation of ISC Japan R&D Center, resulting in a net decrease of three affiliates. The board also appointed three new directors in March 2026, including non-executive directors from SKC, reflecting tighter integration with the SK Group governance structure.

Historical Impact

4 past Large Business Group Filing events at ISC

Median +5d

+8.42%

Range

+4.72% to +11.00%

Positive outcomes

4/4

Filed	P₀	P₊₅	+5d
Feb 26, 2026	₩192,700	₩211,500	+9.76%
Nov 27, 2025	₩103,000	₩110,300	+7.09%

Full Translation

Business Group Status Disclosure (Annual - Individual Company) 6.2 ISC Co., Ltd. Status Disclosure of Member Companies of Large Business Group Business Group Name: SK Business Group Same Person (Controlling Shareholder): Chey Tae-won Business Group Representative Company: SK Inc. Filing Company: ISC Co., Ltd. Contact: Shin Sang-seop (Manager), Phone: 031-777-7675 <Reference> The representative company of the SK Business Group status disclosure is SK Inc., and the overall status disclosure of the SK Business Group is identical to the SK Business Group status disclosure submitted by SK Inc., so please refer to the SK Business Group status disclosure submitted by SK Inc. 1. General Status (1) Company Overview (As of this year's designation date, unit: persons) Member Company: ISC Co., Ltd. Representative: Kim Jung-ryeol Establishment Date: 2001.02.22 Affiliate Inclusion Date: 2023.12.01 Industry: C2629 (Manufacture of Other Electronic Components) Number of Employees: 382 Listing Status: Listed Fiscal Year-End: 2025.12.31 (1-1) Business Activities Member Company: ISC Co., Ltd. - C2629 (Manufacture of Other Electronic Components) - Main products: Semiconductor test sockets, etc. - L6811 (Real Estate Leasing) - Building leasing (2) Company Financial Status (Individual Balance Sheet Basis, prior fiscal year-end, KRW millions, %) ISC Co., Ltd.: - Current Assets: 408,771 - Cash and Cash Equivalents within Current Assets: 49,717 - Non-Current Assets: 207,540 - Total Assets: 616,311 - Current Liabilities: 71,024 - Non-Current Liabilities: 1,053 - Total Liabilities: 72,077 - Borrowings within Total Liabilities: - - Capital Stock: 10,599 - Total Equity: 544,234 - Debt Ratio: 13.24% (3) Company Profit and Loss Status (Individual Income Statement Basis, prior fiscal year-end, KRW millions) ISC Co., Ltd.: - Revenue (or Operating Income): 182,200 - Operating Profit: 47,657 - Other Income, etc.: 17,996 - Other Expenses, etc.: 9,240 - Interest Expense within Other Expenses: 1,019 - Net Income: 47,997 (4) Overseas Affiliate Status (overseas affiliates where a domestic affiliate is the largest shareholder) - ISC VINA MANUFACTURING: Manufacturing, 100.00% internal ownership, Vietnam, FY-end 2025.12.31, Largest shareholder: ISC Co., Ltd. (100.00%) - ISC International: Brokerage, 100.00% internal ownership, USA, FY-end 2025.12.31, Largest shareholder: ISC Co., Ltd. (80.00%) - Tech Dream Co., Ltd: Wholesale, 100.00% internal ownership, Hong Kong, FY-end 2025.12.31, Largest shareholder: ISC Co., Ltd. (100.00%) Total: 3 (5) Affiliate Changes (between prior year designation date and this year's designation date) Inclusions (1): - Tech Dream Co., Ltd: Share acquisition, 2025.05.30, G4680 (General Wholesale) Exclusions (4): - ITMTC Co., Ltd.: Absorption merger, 2025.06.30, C2612 (Manufacture of Diodes, Transistors and Similar Semiconductor Devices) - ISEMI Co., Ltd.: Absorption merger, 2025.11.20, C2629 (Manufacture of Other Electronic Components) - SMATECH INC: Equity sale, 2025.05.23, M7390 (Other Professional, Scientific and Technical Services) - ISC Japan R&D Center: Liquidation completed, 2025.07.24, M7012 (Engineering R&D) Net change: -3 2. Executives, Board of Directors Operating Status [ESG] (1) Executive Status [ESG] (Registered executives, as of this year's designation date) - Kim Jung-ryeol: Representative Director / Inside Director, appointed 2021.07.02, term expires at 2027 AGM. Previously Managing Director at DY Eltek, President at JMT Inc. Reappointed. - Kim Jong-woo: Other Non-Executive Director, appointed 2026.03.26, term expires at 2029 AGM. Concurrent positions: CEO of SKC Inc. (affiliate), CEO of SK Nexilis (affiliate), Non-Executive Director of SK PIC Global (affiliate), Inside Director of Absolics Inc. (affiliate). Previously head of SKC BM Innovation, vice president of Korea Ceramic Society industry cooperation, director of Korea Semiconductor Industry Association, CEO of ISC/SK Enpulse/SK Signet. Currently CEO of SKC and SK Nexilis. New appointment. - Kim Sun-hyuk: Other Non-Executive Director, appointed 2026.03.26, term expires at 2029 AGM. Concurrent position: CSO of SKC (unregistered, affiliate). Previously Head of SKC Portfolio Management Office/BM Innovation Group/Portfolio Management Division. Currently Head of SKC Strategy Division and Head of SK Inc. Value TF. New appointment. - Kim Sung-hyun: Outside Director (Chair of Outside Director Candidate Recommendation Committee), appointed 2021.07.02, term expires at 2027 AGM. Yale University Economics PhD, currently Dean of Sungkyunkwan University College of Economics and Economics Professor. Reappointed. - Cho Dong-il: Outside Director (ESG Committee Chair), appointed 2022.03.31, term expires at 2028 AGM. Former Princeton Assistant Professor, Seoul National University Professor, President of International Federation of Automatic Control. Reappointed. - Park Hye-kyung: Outside Director, appointed 2026.03.26, term expires at 2029 AGM. Previously CEO of PTC Korea, UiPath Korea, ServiceNow Korea; currently Outside Director at MetLife Korea. New appointment. - Kim Cheong-geon: Auditor, appointed 2024.03.28, term expires at 2027 AGM. Executive at Donghyun Accounting Firm. Previously Director at Samil PwC, Managing Director at Yeil Accounting. New appointment. (2) Board of Directors, Board Committees, Shareholder Meeting Systems, Minority Shareholder Rights [ESG] A. Board Operating Status (between prior year designation date and this year's designation date) Board members: Park Won-cheol, Kim Jung-ryeol, Yu Ji-han, Park Jin-woo, Yoon Dong-il, Cho Dong-il, Kim Sung-hyun 2025.06.02: 1. Approval of Management Consulting and Support Services Agreement with SKC Inc. - Approved as proposed (2 outside directors attended) 2025.08.20: 1. Approval of Merger Agreement with ISEMI - Approved as proposed 2. Closure of Shareholders Register and Setting of Record Date - Approved as proposed 3. Sale of Leased Equipment to Vietnam Subsidiary - Approved as proposed 4. Approval of Yangpyeong Training Center Cost Sharing Agreement - Approved as proposed 5. Amendment to Board Regulations - Approved as proposed 2025.09.26: 1. Approval of Merger with ISEMI - Approved as proposed 2. Amendment to Board Regulations - Approved as proposed 3. Establishment of Board Committees and Appointment of Members - Approved as proposed 4. Enactment of Board Committee Regulations - Approved as proposed 5. Enactment of Compliance Control Standards - Approved as proposed 6. Appointment of Compliance Support Officer - Approved as proposed 7. Appointment of Fair Trade Voluntary Compliance Manager - Approved as proposed 2025.10.31: 1. Approval of Public Notice in Lieu of Shareholders' Meeting Regarding Merger with ISEMI Report [Translation truncated]