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

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Material Event Report (Decision to Acquire Own Convertible Bonds Prior to Maturity) 6.0

Samsung Pharmaceutical Co., Ltd. Material Event Report / Matter Subject to Exchange Reporting Obligation To: Financial Services Commission / Korea Exchange

Date: August 12, 2026 Company name: Samsung Pharmaceutical Co., Ltd. Representative Director: Jeong Seong-taek Head office address: 10 Jeyakgongdan 4-gil, Hyangnam-eup, Mansegu, Hwaseong-si, Gyeonggi-do (Telephone) 031-353-6681 (Website) http://www.sspharm.co.kr Preparer: (Title) Executive Vice President (Name) Park Hwa-yeong (Telephone) 070-4840-9291

Decision to Acquire Own Convertible Bonds Prior to Maturity

1. Type of bonds: Series 32, domestic unregistered bonds with interest coupons, unsecured, privately placed convertible bonds 2. Bond issue date: August 21, 2025 3. Bond issuance method: Private placement 4. Bond maturity date: August 21, 2030 5. Total face (electronically registered) value of bonds (KRW): 26,900,000,000 6. Face (electronically registered) value of bonds to be acquired (KRW): 20,225,000,000 7. Acquisition decision date: August 12, 2026 8. Acquisition amount - Amount (KRW): 20,629,500,000 - Basis of calculation: Early-redemption interest rate applied - Scheduled payment date: August 21, 2026 - Source of acquisition funds: Own funds and borrowings 9. Acquisition method: Over-the-counter purchase 10. Reason for acquisition before maturity: Redemption following bondholders' exercise of early-redemption (put option) rights, and bond transfer through negotiation with bondholders 11. Future handling plan: Retirement of the early-redeemed bonds is under consideration, along with possible resale of the transferred bonds 12. Conversion details - Conversion ratio (%): 100 - Conversion price as of report date (KRW/share): 1,591 - Type of shares to be issued upon conversion: Samsung Pharmaceutical Co., Ltd. registered common shares - Number of shares: 12,712,130 - Ratio to total shares outstanding (%): 11.89 - Conversion request period: Start August 21, 2026; End July 21, 2030 13. Remaining face (electronically registered) value of bonds after acquisition (KRW): 6,675,000,000 14. Subject to Fair Trade Commission reporting: Not applicable 15. Other matters material to investment decisions 1) Item 7 "Acquisition decision date" above is the board resolution date for this bond acquisition. 2) In the basis of calculation for item 8 "Acquisition amount," the interest was calculated by applying an early-redemption yield of 2.00% per annum (compounded) to the face value of the bonds from the bond issue date, as agreed with the bondholders; the "scheduled payment date" in item 8 is the date on which payment of the acquisition amount is completed. 3) Item 11 "Future handling plan" above will be finally determined through a future board resolution. 4) In item 12 "Conversion details," the ratio of shares to be issued upon conversion to total shares outstanding 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)].

[Matters Concerning Sellers] Seller: Zest New Technology Investment Association No. 76 - Relationship with the company or largest shareholder: - - Basis of selection: Bondholder of this bond - Transaction history/plan within 6 months before and after the acquisition decision: - - Face value of bonds sold (KRW): 14,000,000,000 - Note: -

Seller: Byun Yun-su - Relationship with the company or largest shareholder: - - Basis of selection: Bondholder of this bond - Face value of bonds sold (KRW): 225,000,000

Seller: Lee Hoon-cheol - Relationship with the company or largest shareholder: - - Basis of selection: Bondholder of this bond - Face value of bonds sold (KRW): 600,000,000

Seller: Park Chang-seok - Relationship with the company or largest shareholder: - - Basis of selection: Bondholder of this bond - Face value of bonds sold (KRW): 200,000,000

Seller: Early-redemption-requesting bondholders - Relationship with the company or largest shareholder: - - Basis of selection: Bondholders of this bond - Face value of bonds sold (KRW): 5,200,000,000

* Among the above sellers, the "early-redemption-requesting bondholders" refers to an unspecified number of bondholders exercising early-redemption rights under the schedule set out in the convertible bond subscription agreement; no specific seller is identified.

[Where Sellers Include a Corporation or Organization] (1) Basic information on the corporation or organization Name: Zest New Technology Investment Association No. 76 Number of investors: 22 Representative director (representative partner): Eastgate Investment Co., Ltd., 1.00% Managing partner: Eastgate Investment Co., Ltd., 1.00% Largest shareholder (largest investor): So Byeong-min, 16.43%

(2) Key financial information of the corporation or organization for the most recent fiscal year (Unit: KRW million) Fiscal year: 2025, settlement month: December Total assets: 1,400 Revenue: 51 Total liabilities: - Net income: 51 Total equity: 1,400 External auditor: - Capital: 1,400 Audit opinion: -