Major Shareholder Report: Contract Change, No Holdings Movement — Soulbrain

Summary

De facto controlling shareholder Jiwan Chung filed an amended large shareholding report with holdings unchanged at 3,479,596 shares (44.73%) and pledged/contracted shares also unchanged at 940,610 shares (12.09%). The filing reason is a modification to terms of a contract concerning held shares, not a buy or sell transaction. The reporter and 10 special-related parties (including Soulbrain Holdings, family members, and executives) collectively maintain the same control structure. Holding purpose remains 'influence over management' as the company's largest shareholder. No share count changes occurred between the prior report (May 6, 2026) and this report (May 28, 2026).

Historical Impact

10 past Large Holding Report (5%+) · ≈ Schedule 13D/G events at Soulbrain

Median +5d

-1.21%

Range

-13.08% to +16.93%

Positive outcomes

5/10

Filed	P₀	P₊₅	+5d
Jul 1, 2026	₩338,500	₩295,500	-12.70%
Jul 1, 2026	₩338,500	₩295,500	-12.70%

Full Translation

Report on Mass Holdings of Stocks, etc. (General) Version 6.0 Soulbrain Co., Ltd. Report on Mass Holdings of Stocks, etc. (General form: Reports under Article 147 of the Financial Investment Services and Capital Markets Act for the purpose of 'influencing management control') To: Financial Services Commission Date of reporting obligation: May 27, 2026 To: Korea Exchange Report preparation reference date: May 28, 2026 Reporter: Jiwan Chung [Summary Information] Issuing company: Soulbrain Co., Ltd. Relationship with issuer: De facto controlling shareholder Report type: Amendment Number and ratio of holdings: - Previous report: 3,479,596 shares (44.73%) - This report: 3,479,596 shares (44.73%) Shares subject to major contracts: - Previous report: 940,610 shares (12.09%) - This report: 940,610 shares (12.09%) Voting rights count and ratio: Not applicable Voting rights subject to major contracts: Not applicable Reason for report: Amendment report The reporter confirms that the holdings of the reporter and special-related parties as of the report preparation reference date are accurately stated in accordance with relevant laws and notation guidelines, with no false statements or omissions of material matters. Part 1: Report Overview 1. Information on the issuing company - Company name: Soulbrain Co., Ltd. - Company code: 357780 - Corporate classification: KOSDAQ-listed company - Total voting shares outstanding: 7,778,566 2. Information on the major holder A. Reporter (1) Reporter overview - Report type: Amendment - Joint name: - - Reporter classification: Individual (domestic) - Nationality: Republic of Korea - Name (Korean): Jung Ji-wan / (Chinese/English): 鄭址完 (Jiwan Chung) - Address: Hasanun-dong, Bundang-gu, Seongnam-si, Gyeonggi-do - Date of birth: 561018 - Occupation: Chairman of the Board, Soulbrain Holdings Co., Ltd. - Relationship with issuer: De facto controlling shareholder - Business contact: Soulbrain Holdings Co., Ltd., Finance Team, Manager Yeo Dae-dong, 031-71****** (2) Specific details on the reporter (only for corporations, organizations, etc.): Not applicable B. Special-related parties (1) Overview of special-related parties: 1. Soulbrain Holdings Co., Ltd. — Domestic corporation, affiliate, business registration 214-81-03416, address: Sampyeong-dong, Bundang-gu, Seongnam-si, Gyeonggi-do; holding company; largest shareholder of issuer 2. Jung Mun-ju — Individual (domestic), relative, DOB 840222, address: Hasanun-dong, Bundang-gu, Seongnam-si; Co-CEO of Soulbrain Holdings; executive of affiliate 3. Jung Ho-gyeong — Individual (domestic), relative, DOB 131119, address: Unjung-dong, Bundang-gu, Seongnam-si; shareholder 4. Materials Park Co., Ltd. — Domestic corporation, affiliate, business registration 307-81-17847, address: Gongdan-gil 34-12 (Geomsang-dong), Gongju-si, Chungcheongnam-do; leasing and building management; affiliate 5. Jung Ji-heung — Individual (domestic), relative, DOB 620607, address: Dodam-dong, Sejong; CEO of Soulbrain SLD Co., Ltd.; executive of affiliate 6. Jung Ji-yeon — Individual (domestic), relative, DOB 480403, address: Doryong-dong, Yuseong-gu, Daejeon; executive of Soulbrain Holdings affiliate 7. Park Young-soo — Individual (domestic), executive, DOB 641224, address: Seongbok-dong, Suji-gu, Yongin-si; CEO of Soulbrain Co., Ltd.; registered executive 8. Yoon Seok-hwan — Individual (domestic), executive, DOB 711005, address: Dajeong-dong, Sejong; executive of Soulbrain Co., Ltd.; registered executive 9. Jung Hye-jung — Individual (domestic), relative, DOB 590111, address: Jijok-dong, Yuseong-gu, Daejeon; shareholder (2) Specific details on special-related parties: ■ Soulbrain Holdings Co., Ltd. (KRW) - Legal form: Stock corporation - Total assets: 2,658,817,185,091 - Total liabilities: 711,208,582,118 - Total equity: 1,947,608,602,973 - Capital stock: 10,482,028,000 - Representatives: Jung Hyun-seok, Jung Mun-ju - Decision-making body: Shareholders' meeting, Board of Directors - Largest shareholder: Jiwan Chung (57.14%) - Note: Based on consolidated financial statements as of end-2025 ■ Materials Park Co., Ltd. (KRW) - Legal form: Stock corporation - Total assets: 105,668,462,640 - Total liabilities: 67,809,341,245 - Total equity: 37,859,121,395 - Capital stock: 1,970,000,000 - Representatives: Yoon Neung-yong, Lee Jin-wook, Choi Young-hwan - Decision-making body: Shareholders' meeting, Board of Directors - Largest shareholder: Jung Mun-ju (40.61%) - Note: Based on separate financial statements as of end-2025 C. Collective investment business operator: Not applicable 3. Number and ratio of holdings - Previous report (May 6, 2026): Jiwan Chung + 10 special-related parties — 3,479,596 shares (44.73%) — total voting shares 7,778,566 - This report (May 28, 2026): Jiwan Chung + 10 special-related parties — 3,479,596 shares (44.73%) — total voting shares 7,778,566 - Change: 0 shares, 0% 4. Holding purpose: Influence over management As the largest shareholder, the reporter exerts influence over the company regarding the matters listed in Article 154(1) of the Enforcement Decree of the Financial Investment Services and Capital Markets Act. Specific plans for items 1-10 below are currently undetermined; however, should such matters arise in connection with the company's business operations, the largest shareholder will make decisions consistent with the company's management objectives. 1. Appointment/dismissal of directors and auditors, or suspension of duties 2. Amendments to articles of incorporation relating to corporate organs such as directors and the board 3. Changes to the company's capital 4. Decisions on dividends 5. Mergers, divisions, and division-mergers of the company 6. Comprehensive stock swaps and transfers 7. Transfer/acquisition of the entire business or material parts as designated by the FSC 8. Disposition of all assets or material parts as designated by the FSC 9. Lease of the entire business or delegation of management, profit/loss-sharing contracts, or similar agreements (entry/change/cancellation) 10. Dissolution of the company 5. Reason for change/amendment - Method of change: - - Reason for change: - - Reason for amendment: Modification of contract related to held shares Part 2: Mass Holdings Details 1. Holdings by reporter and special-related parties A. Holdings by type of stock, etc. (Holdings by category: common shares, warrants, convertible bonds, bonds with warrants, exchangeable bonds, depository receipts, others, and total — for voting shares and shares convertible to voting shares.) [Translation truncated]