Largest shareholder Seo Seong-seok slightly increases stake to 63.01% via OTC trades; new special relations added, control remains stable, limited impact on shareholder value


  • Largest shareholder Seo Seong-seok and related parties' stake increased from 62.98% to 63.01% (+3,400 shares).
  • New special relations 'SSY' and 'BJH' were added, each holding 421,670 shares (4.39%).
  • Seo sold a total of 843,340 shares in three OTC transactions on May 20, 21, 26, purchased by the new relations.
  • Sale prices: 19,320 won, 18,810 won, 18,960 won, near market prices.
  • The new relations financed acquisitions with 8 billion won each (total 16 billion won) via loans from Hana Bank, plus equity.
  • Additionally, Lee Sang-in (affiliate executive) acquired 3,400 shares and became a special relation.
  • [AI Comprehensive Analysis]This filing shows a slight increase in the largest shareholder's stake and restructuring of special relations, with limited direct impact on corporate or shareholder value. Control stability remains, but monitoring the repayment of the new relations' loans (16 billion won) is advisable.

KOSPI Filing Information


  • Filing: Report on Large Shareholding (General)
  • Company: COSMAX BTI (044820)
  • Submission: Seo Seong-seok
  • Receipt: 05-28-2026