An acquisition.

ACQUISITION OF SHARES AND INVESTMENT SECURITIES OF OTHER COMPANIES Notification of Major Management Matters of Subsidiary Lotte Chemical Co., Ltd.

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 with 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 Equity Capital (KRW): 17,628,428,467,279 Ratio to Equity Capital (%): 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 Not applicable 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 Not applicable Plans for Third-Party Allotment Capital Increase within 6 Months: No

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

10. BOARD RESOLUTION DATE (DECISION DATE) 2026-09-17 Attendance of Outside Directors: Present (5), Absent (0) Attendance of Auditor (Non-Outside Director Auditor): -

11. FAIR TRADE COMMISSION REPORTING REQUIREMENT Applicable

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

13. OTHER MATERIAL MATTERS RELATED TO INVESTMENT JUDGMENT

1. This disclosure is a follow-up implementation measure of structural innovation support in accordance with the Daesan Plant business restructuring plan. It concerns participation in a paid-in capital increase for capital expansion 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 through a shareholder allotment method. HD Hyundai Oil Bank Co., Ltd. and the Company, as shareholders, plan to acquire new shares in accordance with their respective ownership ratios (each 50%). Accordingly, the Company plans to contribute 600 billion KRW to acquire 12,000,000 shares of the issuing company. (Issuance price: 50,000 KRW per share)

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

4. The relationship of the issuing company in Section 1 above is described as an affiliated company in consideration of the planned reporting 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 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 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 |