Change of largest shareholder

What happened

Nanocms Co., Ltd. / Change of Largest Shareholder / (2026-08-27)

Change of Largest Shareholder

1. Change details Before the change: Largest shareholder, etc. Kim Hee-ja and 2 others; Shares held 671,279; Ownership ratio 12.83% After the change: Largest shareholder, etc. SH Energy RE200 Co., Ltd.; Shares held 887,000; Ownership ratio 16.96%

2. Reason for the change: Change resulting from the acquisition of new shares upon completion of payment for a third-party placement capital increase - Whether the change results from the acquisition of forfeited shares: No - Whether the transferred shares are subject to mandatory holding: No

3. Purpose of the equity acquisition: To achieve corporate management objectives, including the introduction of important technology - Method of funding the acquisition: Own funds (KRW) 2,000,185,000; Borrowings (KRW) - Not applicable; Lender - Not applicable; Borrowing period - Not applicable; Collateral details - Not applicable - Plans for appointing/dismissing officers after the acquisition: Officers are expected to be appointed at the extraordinary general meeting of shareholders on 2026-09-21.

4. Date of change: 2026-08-27 5. Date confirmed: 2026-08-27

6. Other matters for reference in investment decisions 1. The ownership ratio of the "largest shareholder, etc. before the change" in Item 1 above is calculated based on total issued shares of 5,230,920 after completion of payment for the third-party placement capital increase. 2. "4. Date of change" and "5. Date confirmed" are the date payment for the capital increase was completed. 3. The 887,000 new shares to be issued through the third-party placement capital increase will be subject to a one-year lock-up pursuant to Article 2-2, Paragraph 2 of the Regulation on Issuance and Disclosure of Securities, etc. * Related disclosures: 2026-08-19 Decision on capital increase (third-party placement)

[Detailed Change Information] Name (corporate name/partnership name/other entity name); Relationship; Before the change (shares, ownership ratio); After the change (shares, ownership ratio); Note Kim Hee-ja: Largest shareholder before the change; 270,000 shares, 6.22% to 270,000 shares, 5.16%; Note - Not applicable Kim Si-seok: Related party of the largest shareholder before the change; 241,279 shares, 5.55% to 241,279 shares, 4.61%; Note - Not applicable Kim Hyun-gon: Related party of the largest shareholder before the change; 160,000 shares, 3.68% to 160,000 shares, 3.06%; Note - Not applicable SH Energy RE200 Co., Ltd.: Largest shareholder after the change; 0 shares, 0% to 887,000 shares, 16.96%; Note - Not applicable

[Matters Concerning the Largest Shareholder After the Change (Where a General Corporation)] 1. Basic information on the corporation Corporate name: SH Energy RE200 Co., Ltd.; Nationality: Republic of Korea; Address (head office location) [town/township/neighborhood level]: Nonhyeon-ro, Gangnam-gu, Seoul; Corporate registration number: 110111-0935046; Main business: Professional, scientific, and technical services - Largest shareholder / representative director / representative executive officer status and ownership information: Category Largest shareholder; Name Metis Co., Ltd.; Shares held 400,000; Ownership ratio 49.36% Category Representative Director; Name An Seong-ho; Shares held 10,000; Ownership ratio 1.23% - Officer career history of the largest shareholder / representative director / representative executive officer: Name An Seong-ho; Company SH Energy RE200 Co., Ltd.; Listing status Unlisted; Delisting date (for a delisted company) Not applicable; Position Representative Director; Date joined 2025-08-20; Date left Not applicable; Note Not applicable - History of the largest shareholder / representative director / representative executive officer serving as the largest shareholder of a listed company: Not applicable (all fields)

2. Key financial matters, etc. (unit: KRW million) Fiscal year 2025, settlement month December: Total assets 0; Capital stock 10; Total liabilities 0; Revenue 0; Total equity 0; Net income (loss) 0; External auditor Not applicable; Whether in business suspension: No; Audit opinion: Not applicable; Whether closed: No

3. Relationship with the listed company concerned - Relationship between the listed company and the largest shareholder (corporation): Not applicable - Relationship between the listed company's officers, etc. and the largest shareholder (corporation): Name - Not applicable; Relationship with the largest shareholder (corporation) - Not applicable

4. Transaction history over the most recent 3 years between the listed company concerned and the largest shareholder (corporation) (excluding routine transactions): Category Transaction details; Current year - Not applicable; Prior year - Not applicable; Year before that - Not applicable