GIC Private Limited Crosses 5% Threshold via On-Market Purchase

Large Shareholding Report (Abbreviated) [Report Type: Abbreviated Form — Filed pursuant to Article 147 of the Financial Investment Services and Capital Markets Act; purpose is NOT to influence management control; reporter qualifies as a professional investor under the same article, paragraph 1, latter clause] To: Financial Services Commission To: Korea Exchange Obligation Trigger Date: July 16, 2026 Report Reference Date: July 16, 2026 Reporter: GIC Private Limited ─── Summary ─── Professional Investor Special Reporting Exemption Category: N/A Issuing Company: ISC Co., Ltd. (주식등의대량보유상황보고서(약식)) Relationship with Issuing Company: Other Report Type: New Filing Shares Held (Number / Ratio): Previous Report: — / — This Report: 1,079,480 shares / 5.093% Voting Rights (Number / Ratio): Previous Report: — / — This Report: 1,079,480 / 5.093% Reason for Report: New filing upon crossing the 5% ownership threshold Purpose of Holding: Pure investment (no management influence intended) Declaration: The reporter confirms that, as of the report reference date, the shareholding status of the reporter and related parties has been accurately prepared in accordance with applicable laws and disclosure guidelines, and that there are no material misstatements or omissions. Declaration Letter (Pure Investment Purpose): [Attached image — declaration letter isc.jpg] ─── Part 1: Report Overview ─── 1. Issuing Company Company Name: ISC Co., Ltd. Company Code: 095340 Entity Type: KOSDAQ-listed corporation Total Voting Shares Outstanding: 21,197,058 2. Large Shareholder Details a. Reporter (1) Reporter Overview Report Type: New Filing / Individual Reporter Type: Foreign corporation Nationality: Singapore Name (Korean): 지아이씨 프라이빗 리미티드 Name (English): GIC Private Limited Address: 168 Robinson Road #37-01 Capital Tower, Singapore 068912 Business Registration No. (Equivalent): 198102265N Business Activity: Asset Management Company Relationship with Issuing Company: Other Contact Person: Affiliated Company: Standard Chartered Bank Korea (SC제일은행) Department: Securities Operations Department Title: Deputy General Manager Name: Hwang Seon-yeong Phone: 02-370-XXXXXX Fax: 02-370-XXXXXX Email: ******ng.hwang@sc.com (2) Detailed Information on Reporter (Corporate Entity) Legal Form: Limited Liability Company Total Assets (AUM): USD 100,000,000,000 Total Liabilities: — Total Equity: — Paid-in Capital: SGD 2,000,000 Representative: Wong Hui Ping, GIC Decision-Making Body: Discretionary fund manager Largest Shareholder: Minister for Finance Largest Shareholder Ownership: 100% (Asset figures in USD; capital figures in SGD) b. Related Parties (1) Related Party Overview: None (2) Related Party Details (Corporate): None c. Collective Investment Manager Not applicable (reporter is not a collective investment vehicle as defined under Rule 3-10(2)). 3. Shares Held — Number and Ratio Report Reference Date: July 16, 2026 Reporter: GIC Private Limited Related Parties: None Shares Held: 1,079,480 (5.093%) Voting Shares Held: 1,079,480 (5.093%) Total Voting Shares Outstanding: 21,197,058 Change vs. Previous Report: +1,079,480 shares (+5.093%) 4. Reason for Change Method of Change: On-market purchase Reason: Simple share purchase Other Changes: None ─── Part 2: Large Shareholding Details ─── 1. Breakdown by Security Type (Reporter and Related Parties) Reporter — GIC Private Limited (198102265N): Voting common shares: 1,079,480 All other categories (warrants, CBs, BWs, exchangeable bonds, DRs, other): — Total: 1,079,480 shares / 5.093% Related Parties: None Summary Calculation: A (voting shares held): 1,079,480 I (total voting shares outstanding): 21,197,058 H (latent shares): — Shareholding ratio (shares + latent / outstanding + latent): 5.093% Share ratio (shares only / outstanding): 5.093% 2. Own-Account vs. Client-Account Breakdown (financial institutions only): Not applicable. ─── Part 3: Changes Since Previous Report ─── 1. Summary of Changes Reporter — GIC Private Limited (198102265N): Change in voting shares: +1,079,480 (+5.093%) All other categories: — Net change total: +1,079,480 / +5.093% Related Parties: None 2. Detailed Transaction Log (Unit: shares, KRW) GIC Private Limited (198102265N) Date: July 15, 2026 Method: On-market purchase (+) Type: Voting common shares Before: 0 → Change: +1,058,998 → After: 1,058,998 Price per share: KRW 158,500 Note: Below 5% threshold as of July 15, 2026 closing price basis applied. Date: July 16, 2026 Method: On-market purchase (+) Type: Voting common shares Before: 1,058,998 → Change: +20,482 → After: 1,079,480 Price per share: KRW 145,422 Note: — [Regulatory Note: Pursuant to Articles 154(4) and 154(5)(ii)–(iii) of the Enforcement Decree of the FSCMA, for state entities, local governments, the Bank of Korea, and professional investors exempt from the standard reporting requirement whose holding purpose is not to influence management control, changes may be aggregated by obligation trigger date; the acquisition/disposal method and unit price fields may be omitted.] [Translation truncated — original document ends at the footnote regarding on-market securities trading procedures]