CEO Daegyu Yoo increases stake from 20.68% to 22.74% via call option exercise on preferred shares, diluting minority shareholders at a deep discount


  • CEO Daegyu Yoo exercised a call option on redeemable convertible preferred shares on July 1, 2026, acquiring 683,709 common shares at a conversion price of 2,880 KRW per share, a 44% discount to the current market price of 5,160 KRW.
  • As a result, Yoo's ownership increased from 20.68% to 22.74% a 2.06 percentage point gain. The new common shares represent approximately 1.4% of the pre-conversion outstanding shares, diluting existing shareholders.
  • The transaction involves no new capital inflow to the company. While the CEO's increased stake could be seen as a sign of alignment, the deep discount conversion raises concerns about minority shareholder value erosion.
  • [AI Summary]CEO Yoo's discounted share conversion dilutes minority shareholders without bringing fresh capital. The move may pressure the stock price negatively in the near term, and investors should monitor for any remaining convertible securities.

KOSDAQ Filing Information


  • Report on Ownership of Specific Securities by Executives and Major Shareholders
  • Company: Pentastone Electronics (332570)
  • Submission: Daegyu Yoo

  • Shares: 46,711,563
  • Price: 5,160 KRW
  • Market Cap: 241 B KRW