Major shareholder Donggyu Jeon's stake decreases by 3.17%p due to related party's block sale


  • Reporting person (Donggyu Jeon and specially related parties) decreased shareholding by 2,000,000 shares, ownership from 26.77% to 23.60%
  • Specially related party SJ Value Up sold all 2 million shares via block trade at 64,774 won per share; proceeds used to repay stock-backed loans
  • Reporting person himself (Donggyu Jeon) had no change in shareholding (12,468,288 shares, 19.59%)
  • A total of 12,290,502 shares (19.32%) held by reporting person and specially related parties are pledged as collateral with multiple securities firms (average maintenance ratio 120-200%)

KOSDAQ Filing Information


  • Filing: Report on Large Shareholding (General)
  • Company: Seojin System (178320)
  • Submission: Donggyu Jeon
  • Receipt: 05-22-2026