An acquisition.

DECISION ON ACQUISITION OF STOCKS AND INVESTMENT SECURITIES OF OTHER COMPANIES

1. ISSUING COMPANY Company Name: H&L Advanced Co., Ltd. Nationality: Republic of Korea Representatives: Cheon Yang-sik, Cho Nam-su Capital (KRW): 1,824,000,000,000 Relationship to Company: Affiliated company Total Issued Shares: 364,800,000 shares Principal Business: Manufacture of petrochemical basic chemical substances

2. ACQUISITION DETAILS Number of Shares to Acquire: 12,000,000 shares Acquisition Amount (KRW): 600,000,000,000 Shareholder Equity (KRW): 17,628,428,467,279 Ratio to Shareholder Equity (%): 3.40 Large Corporation Status: Applicable

3. OWNERSHIP SHARES AND EQUITY RATIO AFTER ACQUISITION Number of Shares Owned: 194,400,000 shares Equity Ratio (%): 50.0

4. ACQUISITION METHOD Cash acquisition

5. PURPOSE OF ACQUISITION Repayment of existing borrowings of H&L Advanced Co., Ltd. and improvement of financial structure

6. SCHEDULED ACQUISITION DATE 2026-09-28

7. SUBMISSION OF MAJOR MATTERS REPORT ON ASSET TRANSFER No - Total Assets at End of Most Recent Fiscal Year (KRW): 31,117,333,049,679 - Acquisition Price / Total Assets (%): 1.93

8. REVERSE LISTING APPLICABILITY No - Plan for Third-Party Allotment Capital Increase within 6 Months: No

9. COMPLIANCE WITH REVERSE LISTING REQUIREMENTS OF ISSUING COMPANY (OTHER COMPANY) Not applicable

10. BOARD OF DIRECTORS RESOLUTION DATE (DECISION DATE) 2026-09-17 - Outside Directors in Attendance: 5 - Outside Directors Absent: 0 - Auditor (Non-Outside Director Auditor Committee) Attendance: -

11. FAIR TRADE COMMISSION REPORTING REQUIREMENT Applicable

12. PUT OPTION AND OTHER CONTRACT EXECUTION No - Contract Details: -

13. OTHER MATERIAL MATTERS RELATED TO INVESTMENT DECISION

1. This disclosure is a follow-up implementation measure of structural innovation support in accordance with the Daesan Plant business reorganization plan. It concerns participation in a paid-in capital increase for capital augmentation and financial structure improvement of H&L Advanced Co., Ltd., a joint venture established through the merger of Lotte Daesan Petrochemical Co., Ltd. (a spin-off company of the Company) and HD Hyundai Chemical Co., Ltd.

2. This paid-in capital increase will proceed on a shareholder allocation basis. HD Hyundai Oil Bank Co., Ltd. and the Company, as shareholders, plan to subscribe for new shares in accordance with their respective ownership ratios (each 50%). Accordingly, the Company plans to contribute 600 billion won to acquire 12,000,000 shares of the issuing company. (Issuance price: 50,000 won per share)

3. The capital and total issued shares of the issuing company in Section 1 above are prepared as of September 2, 2026 (the effective date of the merger), reflecting changes resulting from the effectiveness of the merger and completion of new share issuance.

4. The relationship of the issuing company to the Company in Section 1 above is described as an affiliated company in consideration of the planned registration of inclusion in the Lotte Group based on equity relationships.

5. The scheduled acquisition date in Section 6 above is the scheduled date of capital contribution payment.

6. The current fiscal year in the summary financial information of the issuing company is based on the end of 2025.

7. This disclosure is a confirmed disclosure regarding the "Clarification of Rumors or Press Reports (Unconfirmed)" announced by the Company on August 24, 2026. Meanwhile, H&L Advanced Co., Ltd., established through the merger of Lotte Daesan Petrochemical Co., Ltd. and HD Hyundai Chemical Co., Ltd., which were established through the spin-off of the Company's Daesan Plant, has been converted into a corporation jointly controlled by the Company and HD Hyundai Oil Bank Co., Ltd.

8. Decisions regarding specific execution timing, execution methods, and other detailed matters have been delegated to the Representative Director.

※ Related Disclosure: 2026-08-24 Clarification of Rumors or Press Reports (Unconfirmed)

[SUMMARY FINANCIAL INFORMATION OF ISSUING COMPANY] (Unit: KRW)

| Item | Total Assets | Total Liabilities | Total Equity | Capital | Sales | Net Income for Period | Audit Opinion | External Auditor | |------|--------------|------------------|--------------|---------|-------|----------------------|----------------|------------------| | Current Year | 6,135,841,926,552 | 4,906,778,926,254 | 1,229,063,000,298 | 1,520,000,000,000 | 7,220,128,209,351 | -483,125,460,647 | Appropriate | Samil Accounting Firm | | Prior Year | 5,946,458,542,484 | 4,334,894,417,510 | 1,611,564,124,974 | 1,520,000,000,000 | 7,322,856,473,922 | -283,748,604,783 | Appropriate | Samil Accounting Firm | | Two Years Prior | 6,120,376,602,477 | 4,218,272,434,220 | 1,902,104,168,257 | 1,520,000,000,000 | 5,770,045,069,730 | -156,190,726,618 | Appropriate | Samil Accounting Firm |