Updated terms.

CORRECTION NOTICE ON ACQUISITION OF SHARES AND INVESTMENT SECURITIES OF OTHER CORPORATION

Correction Date: 2026-09-18

1. Corrected Public Disclosure Document Decision on Acquisition of Shares and Investment Securities of Other Corporation

2. Submission Date of Corrected Public Disclosure Document 2026-09-10

3. Reason for Correction Correction notice submitted upon completion of stock acquisition

4. Corrected Items Item 13. Other Matters for Investment Decision Reference

Corrected From: Acquisition Schedule as follows: Deposit: September 10, 2026 - 500 million won (offset against due diligence deposit for stock purchase purpose) Balance Payment: September 18, 2029 - 12.3 billion won 1) 9th Series Convertible Bond Substitute Payment: 7.8 billion won 2) Cash: 4.5 billion won

Corrected To: Acquisition Schedule as follows: Deposit: September 10, 2026 - 500 million won (offset against due diligence deposit for stock purchase purpose) Balance Payment: September 18, 2026 - 12.3 billion won 1) 9th Series Convertible Bond Substitute Payment: 7.8 billion won 2) Cash: 4.5 billion won

DECISION ON ACQUISITION OF SHARES AND INVESTMENT SECURITIES OF OTHER CORPORATION

1. Issuing Company Company Name (Nationality): Lead Engineering Co., Ltd. (Republic of Korea) Representative Director: Kim Hyun-ho Capital (KRW): 800,000,000 Relationship with Company: - Total Issued Shares: 1,000 shares Principal Business: Manufacturing of machinery for semiconductor manufacturing Acquisition of New Shares by Third-Party Allotment within Recent 6 Months: No

2. Acquisition Details Number of Shares to Acquire: 800 shares Acquisition Amount (KRW): 12,800,000,000 Equity Capital (KRW): 45,504,478,457 Ratio to Equity Capital (%): 28.13 Large Enterprise Status: Not Applicable

3. Shareholding and Ownership Ratio After Acquisition Number of Shares Held: 800 shares Ownership Ratio (%): 80.0

4. Acquisition Method Cash and substitute payment

5. Purpose of Acquisition Securing new growth engines through entry into SiC power semiconductor equipment business and expansion of business portfolio

6. Scheduled Acquisition Date 2026-09-18

7. Subject to Major Asset Transfer Report Submission No Total Assets at End of Most Recent Fiscal Year (KRW): 154,697,625,359 Acquisition Price / Total Assets (%): 8.27

8. Reverse Listing Applicability No Plan for Third-Party Allotment Capital Increase within Next 6 Months: No

9. Compliance with Reverse Listing Requirements of Issuing Company (Other Corporation) No

10. Board Resolution Date (Decision Date) 2026-09-10 Independent Director Attendance: Present (1), Absent (1) Auditor (Audit Committee) Attendance: Present

11. Fair Trade Commission Reporting Subject Not Applicable

12. Execution of Put Option Contracts, etc. Yes

Contract Terms: - The purchaser or a party designated by the purchaser holds a call option on all or part of the remaining equity interest. - The call option may be exercised in whole or in part at the purchaser's discretion from one year to four years from the transaction closing date. However, in the event of early resignation without justifiable cause by the seller, willful misconduct, or dismissal due to material breach of duty (meaning dismissal due to violation of applicable laws, internal regulations, this contract, etc. by the seller; hereinafter the same), the option may be exercised immediately even before the above period. - The seller holds a put option to demand purchase of all or part of the remaining equity interest from the purchaser on or after 24 months from the transaction closing date. The purchaser shall pay the full exercise price in cash within 10 business days of receipt of the exercise notice (no offset permitted), and if payment is delayed, a default interest of 15% per annum shall be added.

13. Other Matters for Investment Decision Reference - The above capital and total issued shares are based on the date of disclosure submission. - The equity capital in Section 2 (Acquisition Details) above reflects the equity capital from the most recent fiscal year-end consolidated financial statements adjusted for changes in capital and capital surplus from the disclosure submission date. - The acquisition schedule in Section 4 above is as follows: Deposit: September 10, 2026 - 500 million won (offset against due diligence deposit for stock purchase purpose) Balance Payment: September 18, 2026 - 12.3 billion won 1) 9th Series Convertible Bond Substitute Payment: 7.8 billion won 2) Cash: 4.5 billion won - The scheduled acquisition date in Section 6 above is the balance payment date. - The total assets at the end of the most recent fiscal year in Section 7 above are based on the company's consolidated financial statements as of the end of 2025. - The current fiscal year, prior fiscal year, and two years prior in the summary financial condition of the issuing company below are prepared based on financial statements for 2025, 2024, and 2023.

SUMMARY FINANCIAL CONDITION OF ISSUING COMPANY (Unit: Million KRW)

Category | Total Assets | Total Liabilities | Total Equity | Capital | Sales | Net Income (Loss) Current Fiscal Year | 14,562 | 3,119 | 11,443 | 800 | 10,334 | 1,018 Prior Fiscal Year | 18,717 | 8,292 | 10,425 | 800 | 22,659 | 1,273 Two Years Prior | 18,336 | 8,197 | 10,139 | 800 | 38,745 | 1,339

INFORMATION REGARDING COUNTERPARTY

1. Personal Information

Basic Information: Name (Corporate Name): Lead Engineering Co., Ltd. Nationality: Republic of Korea Address (Principal Place of Business) [up to eup/myeon/dong level]: Chungcheongbuk-do, Cheongju-si, Cheongwon-gu, Ochang-eup Date of Birth (Business Registration Number, etc.): 317-81-02152 Occupation (Business Description): Manufacturing of machinery for semiconductor manufacturing

Status of Largest Shareholder, Representative Director, and Chief Executive Officer and Financial Condition (when counterparty is a corporation):

Category | Name | Number of Shares | Ownership Ratio (%) Largest Shareholder | Kim Hyun-ho | 1,000 | 100.0 Representative Director | Kim Hyun-ho | 1,000 | 100.0

(Unit: Million KRW) Fiscal Year: 2025 Closing Date: December Total Assets: 14,562 Capital: 800 Total Liabilities: 3,119 Sales: 10,334 Total Equity: 11,443 Net Income (Loss) for Period: 1,018 External Auditor: Chungsul CPA Audit Division (No. 230) Business Suspension Status: No Audit Opinion: Appropriate Business Closure Status: No

2. Relationship with Counterparty

1. Relationship between Company and Counterparty: -

2. Relationship between Company's Largest Shareholder, Officers and Counterparty: Name | Relationship with Counterparty |

3. Transaction History over Recent 3 Years (excluding routine transactions): Category | Transaction Details Current Fiscal Year | Prior Fiscal Year | Two Years Prior |