CEO Open-Market Share Purchase — Ownership Rises to 27.88% — Cheonbo

Summary

Lee Sang-ryul, CEO and founder of Cheonbo (KOSDAQ: 278280), purchased 22,538 common shares on the open market on June 26, 2026, across dozens of separate fills at prices ranging from approximately ₩38,800 to ₩39,550 per share, implying a total outlay of roughly ₩883 million (~$640K USD). His direct shareholding increased from 3,393,462 shares (27.69%) to 3,416,000 shares (27.88%), while total specific securities including warrants rose from 4,351,706 (29.71%) to 4,374,244 (29.86%). The CEO also holds 958,244 securities in the form of bonds with warrant rights (신주인수권부사채권). Insider open-market buying by the chief executive at these price levels is typically interpreted as a confidence signal regarding the company's near-term outlook.

Historical Impact

2 past Insider Ownership Change · ≈ Form 4 events at Cheonbo

Median +5d

-8.38%

Range

-9.99% to -6.78%

Positive outcomes

0/2

Filed	P₀	P₊₅	+5d
Jun 22, 2026	₩42,800	₩39,900	-6.78%
Jun 17, 2026	₩43,050	₩38,750	-9.99%

Full Translation

Report on Ownership of Specified Securities by Executive / Major Shareholder Filing version: 6.1 Company: Cheonbo Co., Ltd. Filing date: June 26, 2026 To: Korea Securities & Futures Commission To: Korea Exchange Obligation trigger date: June 26, 2026 Report preparation reference date: June 26, 2026 ※ The reporter confirms that the ownership status of specified securities as of the report preparation reference date has been accurately recorded in accordance with applicable laws and filing instructions, and that there are no material misstatements or omissions. Reporter: Lee Sang-ryul 1. Issuing Company Company name: Cheonbo Co., Ltd. Listing type: KOSDAQ-listed corporation Company code: 278280 Total shares issued: 12,253,025 2. Reporter Information Report type: Change Reporter classification: Individual (domestic) Name (Korean): 이상율 Name (Chinese/English): 李相律 (LEE SANG RYUL) Date of birth (partial): 611021 Address (up to town/village level): Jungangtap-myeon, Chungju-si, Chungcheongbuk-do Relationship to issuing company: Executive (registered) Title: CEO (Representative Director) Appointment date: October 8, 2007 Resignation date: — Major shareholder: Yes (10%+ shareholder) Contact person: Company: Cheonbo Co., Ltd. Department: Management Team Title: Deputy Manager (차장) Phone: 070-48******* Name: Yoon Hong-hwan Fax: 043-84****** Email: ******1@chunbochem.com 3. Ownership of Specified Securities a. Number and Ownership Ratio of Specified Securities | | Reference date | Specified securities (shares) | Ratio (%) | Common shares | Ratio (%) | |---|---|---|---|---|---| | Previous report | June 25, 2026 | 4,351,706 | 29.71 | 3,393,462 | 27.69 | | This report | June 26, 2026 | 4,374,244 | 29.86 | 3,416,000 | 27.88 | | Change | | +22,538 | +0.15 | +22,538 | +0.19 | b. Breakdown by Type of Specified Securities | Common shares | Subscription warrants | Convertible bonds | Bonds w/ warrants | Participating bonds | Exchangeable bonds | DRs | Other | Total | |---|---|---|---|---|---|---|---|---| | 3,416,000 | — | — | 958,244 | — | — | — | — | 4,374,244 | Total issued shares (J): 12,253,025 Non-share specified securities (I): 958,244 Ownership ratio of total specified securities: 29.86% Ownership ratio of common shares only: 27.88% c. Detailed Transaction History (all on June 26, 2026, all open-market purchases of common shares) All transactions below are open-market purchases (+) on June 26, 2026 in common shares: | Before | Change | After | Price (KRW) | |---|---|---|---| | 3,393,462 | +3 | 3,393,465 | 39,550 | | 3,393,465 | +25 | 3,393,490 | 39,500 | | 3,393,490 | +109 | 3,393,599 | 39,500 | | 3,393,599 | +6 | 3,393,605 | 39,450 | | 3,393,605 | +10 | 3,393,615 | 39,550 | | 3,393,615 | +26 | 3,393,641 | 39,500 | | 3,393,641 | +1 | 3,393,642 | 39,500 | | 3,393,642 | +61 | 3,393,703 | 39,400 | | 3,393,703 | +20 | 3,393,723 | 39,350 | | 3,393,723 | +1 | 3,393,724 | 39,400 | | 3,393,724 | +111 | 3,393,835 | 39,450 | | 3,393,835 | +12 | 3,393,847 | 39,400 | | 3,393,847 | +12 | 3,393,859 | 39,400 | | 3,393,859 | +32 | 3,393,891 | 39,450 | | 3,393,891 | +18 | 3,393,909 | 39,350 | | 3,393,909 | +150 | 3,394,059 | 39,250 | | 3,394,059 | +268 | 3,394,327 | 39,300 | | 3,394,327 | +34 | 3,394,361 | 39,250 | | 3,394,361 | +3 | 3,394,364 | 39,250 | | 3,394,364 | +1 | 3,394,365 | 39,200 | | 3,394,365 | +12 | 3,394,377 | 39,150 | | 3,394,377 | +22 | 3,394,399 | 39,150 | | 3,394,399 | +15 | 3,394,414 | 39,050 | | 3,394,414 | +40 | 3,394,454 | 39,100 | | 3,394,454 | +75 | 3,394,529 | 39,100 | | 3,394,529 | +19 | 3,394,548 | 39,500 | | 3,394,548 | +5 | 3,394,553 | 38,800 | | 3,394,553 | +3 | 3,394,556 | 39,100 | | 3,394,556 | +20 | 3,394,576 | 39,000 | | 3,394,576 | +31 | 3,394,607 | 39,100 | | 3,394,607 | +8 | 3,394,615 | 39,050 | | 3,394,615 | +20 | 3,394,635 | 39,000 | | 3,394,635 | +1 | 3,394,636 | 39,150 | | 3,394,636 | +1 | 3,394,637 | 39,100 | | 3,394,637 | +100 | 3,394,737 | 39,100 | | 3,394,737 | +1 | 3,394,738 | 39,100 | | 3,394,738 | +40 | 3,394,778 | 39,100 | | 3,394,778 | +1 | 3,394,779 | 39,100 | | 3,394,779 | +3 | 3,394,782 | 39,100 | | 3,394,782 | +542 | 3,395,324 | 39,100 | | 3,395,324 | +2 | 3,395,326 | 39,050 | | 3,395,326 | +27 | 3,395,353 | [continued...] | [Translation truncated — source disclosure was cut off mid-transaction list]