Newly Appointed Executive Director Buys 301 Shares in First Insider Filing — Cheonbo

Summary

A newly appointed managing director, Lee Keun-pil, filed his initial report on ownership of specific securities after purchasing 301 common shares on the open market on June 11, 2026 at KRW 38,507 per share. The total holding represents just 0.00% of the 12,253,025 outstanding shares, amounting to roughly KRW 11.6 million in value. The filing is a routine disclosure triggered by his appointment as a registered managing director on March 24, 2026. While the absolute transaction size is small, insider purchases by newly appointed executives are often viewed as a mild signal of confidence in the company.

Historical Impact

1 past Insider Ownership Change · ≈ Form 4 event at Cheonbo

Median +5d

-6.78%

Range

-6.78% to -6.78%

Positive outcomes

0/1

Filed	P₀	P₊₅	+5d
Jun 22, 2026	₩42,800	₩39,900	-6.78%

Past performance does not guarantee future results. Small sample sizes may not be representative. For informational purposes only.

Full Translation

Report on Ownership of Specific Securities by Executives and Major Shareholders 6.1 Cheonbo Co., Ltd. 2026-06-11 Report on Ownership of Specific Securities by Executives and Major Shareholders To: Securities and Futures Commission To: Korea Exchange Date of reporting obligation: June 11, 2026 Report reference date: June 11, 2026 * The reporter hereby confirms that, as of the reference date, the ownership status of his specific securities has been accurately prepared in accordance with relevant laws and instructions, and that there is no false statement or omission of material facts. Reporter: Lee Keun-pil 1. Issuer Information - Company Name: Cheonbo Co., Ltd. - Corporate Classification: KOSDAQ-listed corporation - Company Code: 278280 - Total Issued Shares: 12,253,025 2. Reporter Information - Report Type: New - Reporter Classification: Individual (Domestic) - Name (Korean): Lee Keun-pil - Name (Chinese/English): 李根弼 (Keunpil Lee) - Date of Birth: 1970-12-18 - Address: 7 Wishity 1-ro, Ilsandong-gu, Goyang-si, Gyeonggi-do - Relationship with Issuer: Executive (Registered) - Position: Managing Director - Appointment Date: March 24, 2026 - Resignation Date: - - Major Shareholder: - Business Contact: - Affiliated Company: Cheonbo Co., Ltd. - Department: Management Team - Position: Deputy General Manager - Phone: 070-48******* - Name: Yoon Hong-hwan - Fax: 043-84****** - Email: ******1@chunbochem.com 3. Ownership Status of Specific Securities A. Number and Ratio of Specific Securities Owned - Previous report: - / - / - / - - Current report (June 11, 2026): 301 shares (0.00%) / 301 shares (0.00%) - Change: +301 shares (0.00%) B. Holdings by Type of Specific Securities - Common Stock: 301 shares - Warrants, Convertible Bonds, Bonds with Warrants, Participating Bonds, Exchangeable Bonds, Depositary Receipts, Other: None - Total: 301 shares (0.00%) - Total Issued Shares (J): 12,253,025 - Ownership ratio of specific securities: 0.00% - Ownership ratio of common stock: 0.00% C. Detailed Change History - Reason: On-market purchase (+) - Change Date: June 11, 2026 - Type: Common stock - Before: - - Change: +301 - After: 301 - Acquisition Price: KRW 38,507 - Total: 301 shares at KRW 38,507 * For securities-market transactions, the contract settlement date is used. ** For non-stock securities, the price refers to the exercise/conversion/exchange price or the trading price of shares acquired through exercise; figures in parentheses indicate the trading price of the security itself.