Material event report (decision to redeem own convertible bonds early)

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Material Event Report (Decision to Redeem Own Convertible Bonds Before Maturity) 6.0

Sonokong Co., Ltd. Material Event Report / Korea Exchange Disclosure Obligation To the Financial Services Commission / Korea Exchange July 23, 2026

Company name: Sonokong Co., Ltd. CEO: Cha Hyun-il Head office address: 101-dong, 305-ho, 223 Sinheung-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do Phone: 02-561-8550; Website: http://www.sonokong.co.kr Preparer: (Title) Head of Management Support Division (Name) An Gyeong-won; Phone: 02-2610-8750

Decision to Redeem Own Convertible Bonds Before Maturity

1. Type of bond: Series 11, domestic unregistered interest-bearing unsecured private convertible bonds 2. Bond issuance date: June 18, 2025 3. Issuance method: private placement 4. Bond maturity date: June 18, 2028 5. Total face value (electronically registered) of the bonds: KRW 20,000,000,000 6. Face value (electronically registered) of the bonds to be redeemed: KRW 2,000,000,000 7. Date of the redemption decision: July 23, 2026 8. Redemption amount: KRW 2,079,291,896; Basis for calculation: early-redemption payment at a rate negotiated with the bondholders; (Expected) payment date: July 23, 2026; Source of redemption funds: own funds 9. Redemption method: over-the-counter purchase 10. Reason for redemption before maturity: early redemption negotiated with bondholders 11. Future handling plan: to be decided through a future board resolution 12. Conversion terms: Conversion ratio 100%; Conversion price as of the report date: KRW 3,305/share; Type of shares to be issued on conversion: Sonokong Co., Ltd. registered common shares; Number of shares: 605,143; Ratio to total shares outstanding: 3.78%; Conversion request period: from June 18, 2026 to May 18, 2028 13. Face value (electronically registered) of the bonds outstanding after the redemption: KRW 15,000,000,000 14. Whether subject to Fair Trade Commission reporting: not applicable 15. Other matters relevant to investment decisions: The above redemption amount includes both principal and interest. The above redemption decision date is the board resolution date, and the (expected) payment date is the actual bond-redemption date. The ratio to total shares to be issued on conversion was calculated as [number of voting shares to be issued / (total voting shares outstanding as of the acquisition date + number of voting shares to be issued)].

[Particulars of the sellers] Seller: Sangsangin Savings Bank Co., Ltd.; Relationship to the Company or largest shareholder: -; Bondholder; Basis of selection: -; Transaction history/plan within 6 months before and after the redemption decision: -; Face value of bonds sold: KRW 1,000,000,000; Remarks: - Seller: Sangsangin Plus Savings Bank Co., Ltd.; Relationship: -; Bondholder; Basis of selection: -; Transaction history/plan: -; Face value of bonds sold: KRW 1,000,000,000; Remarks: -

[Where a seller is a corporation or organization] (1) Basic information Sangsangin Savings Bank Co., Ltd.: Number of investors: 1; CEO: Lee Jae-ok, -; Executive officer: -, -; Largest shareholder: Sangsangin Co., Ltd., 100% (2) Key financial information for the most recent fiscal year (unit: KRW million) Fiscal year: 2025; Settlement month: December; Total assets: 2,006,871; Revenue: 304,218; Total liabilities: 1,779,537; Net income: 10,668; Total equity: 227,334; External auditor: Samduk Accounting Corporation; Capital: 68,000; Audit opinion: unqualified

Sangsangin Plus Savings Bank Co., Ltd. (1) Basic information: Number of investors: 1; CEO: Lee In-seop, -; Executive officer: -, -; Largest shareholder: Sangsangin Co., Ltd., 100% (2) Key financial information for the most recent fiscal year (unit: KRW million) Fiscal year: 2025; Settlement month: December; Total assets: 1,259,951; Revenue: 164,040; Total liabilities: 1,163,103; Net income: (8,525); Total equity: 96,848; External auditor: Woori Accounting Corporation; Capital: 34,925; Audit opinion: unqualified

Sangsangin Co., Ltd. (1) Basic information: Number of investors: 7,536; CEO: Yoo Jun-won / Lee Min-sik, 23.65% / -; Largest shareholder: Yoo Jun-won, 23.65% (2) Key financial information for the most recent fiscal year (unit: KRW million) Fiscal year: 2026; Settlement month: March; Total assets: 5,165,448; Revenue: 126,894; Total liabilities: 4,691,321; Net income: 11,755; Total equity: 474,127; External auditor: Woori Accounting Corporation; Capital: 57,187; Audit opinion: unqualified