SOUTH KOREA · OPENDART
CORESTEMCHEMON Inc.
코아스템켐온 · 166480 · KOSDAQ · Healthcare · Biotechnology
Score
Not ranked: no net buying on the exchange by an individual insider in the last 180 days.
Insiders' buying price vs the latest close
Insiders paid 1,367.05 KRW a share on average (6 purchase lines, 1 buyer, 2025-11-28 – 2025-12-22). The close on 2026-10-16 was 42.6% above that price.
The latest purchase (2025-12-22) was at 1,943.00 KRW; the close was 0.3% above that price.
Prices paid are weighted by shares and taken from the filings; dividends are not counted. Not scored.
Insider trades on the exchange
Purchases and sales on the exchange in the last 12 months. The filing gives the settlement date; the trade date is two trading days earlier.
| Trade date | Insider | Role | Trade | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2025-12-22 | Gil An Yang | CEO | Bought on the exchange | 62,515 | ₩1,943 | ₩121.5M | DART ↗ |
| 2025-12-05 | Gil An Yang | CEO | Bought on the exchange | 139,690 | ₩1,538 | ₩214.8M | DART ↗ |
| 2025-12-04 | Gil An Yang | CEO | Bought on the exchange | 10,000 | ₩1,395 | ₩13.9M | DART ↗ |
| 2025-12-03 | Gil An Yang | CEO | Bought on the exchange | 454,994 | ₩1,403 | ₩638.4M | DART ↗ |
| 2025-12-01 | Gil An Yang | CEO | Bought on the exchange | 293,316 | ₩1,285 | ₩376.9M | DART ↗ |
| 2025-11-28 | Gil An Yang | CEO | Bought on the exchange | 230,000 | ₩1,139 | ₩262.0M | DART ↗ |
Other changes in holdings · 37
Option exercises, grants, new shares, inheritance, gifts, off-exchange trades and trades by companies and funds. Not counted in the score.
| Date | Insider | Role | Reason | Shares | Filing |
|---|---|---|---|---|---|
| 2026-08-31 | Kwang Sun Kwon | President | Executive retirement(-) | 47,200 | DART ↗ |
| 2026-08-31 | Kwang Sun Kwon | President | Executive retirement(-) | 1,537,872 | DART ↗ |
| 2026-07-01 | KWIJOO KIM | Director | New appointment(+) | 3,500 | DART ↗ |
| 2025-12-23 | Tae Yong Lee | Director | Exercise price adjustment | 557,777 | DART ↗ |
| 2025-12-23 | Kwang Sun Kwon | President | Exercise price adjustment | 1,311,266 | DART ↗ |
| 2025-11-12 | Ryung-Ah Lee | Division head | Others(-) | 1,334 | DART ↗ |
| 2025-11-12 | Gil An Yang | CEO | Others(-) | 3,641 | DART ↗ |
| 2025-11-12 | Gil An Yang | CEO | Acquisition of paid-in new shares(+) | 4,369 | DART ↗ |
| 2025-11-12 | Song Si Whan | President | Others(-) | 20,000 | DART ↗ |
| 2025-11-12 | Song Si Whan | President | Others(-) | 187,850 | DART ↗ |
| 2025-11-12 | Song Si Whan | President | Acquisition of paid-in new shares(+) | 20,000 | DART ↗ |
| 2025-11-12 | Jong Il Kim | Managing director | Others(-) | 2,491 | DART ↗ |
| 2025-11-12 | Jong Il Kim | Managing director | Acquisition of paid-in new shares(+) | 2,989 | DART ↗ |
| 2025-11-12 | Kim Moon Soon | Director | Others(-) | 617 | DART ↗ |
| 2025-11-12 | Kyung Suk Kim | Adviser | Others(-) | 743,892 | DART ↗ |
| 2025-11-12 | Kyung Suk Kim | Adviser | Acquisition of paid-in new shares(+) | 743,892 | DART ↗ |
| 2025-10-22 | Gil Gi Hyun | Managing director | Disposal in exchange(-) | 11,965 | DART ↗ |
| 2025-10-22 | Kim Moon Soon | Director | Disposal in exchange(-) | 618 | DART ↗ |
| 2025-10-21 | Kyung Suk Kim | Adviser | Disposal in OTC(-) | 867,875 | DART ↗ |
| 2025-10-20 | Tae Yong Lee | Director | Disposal in exchange(-) | 9,237 | DART ↗ |
| 2025-10-20 | Kwang Sun Kwon | President | Disposal in exchange(-) | 33,599 | DART ↗ |
| 2025-10-16 | Gil Gi Hyun | Managing director | Disposal in exchange(-) | 3,000 | DART ↗ |
| 2025-10-16 | Tae Yong Lee | Director | Disposal in exchange(-) | 5,000 | DART ↗ |
| 2025-10-15 | Kyung Suk Kim | Adviser | Off-hour trading(-) | 796,187 | DART ↗ |
| 2025-10-13 | Kyung Suk Kim | Adviser | Disposal in OTC(-) | 867,876 | DART ↗ |
| 2025-09-30 | Kyung Suk Kim | Adviser | Others(+) | 2,479,643 | DART ↗ |
| 2025-09-30 | Jong Il Kim | Managing director | Others(+) | 2,491 | DART ↗ |
| 2025-09-30 | Tae Yong Lee | Director | Others(+) | 14,237 | DART ↗ |
| 2025-09-30 | Ryung-Ah Lee | Division head | Others(+) | 1,334 | DART ↗ |
| 2025-09-30 | Gil An Yang | Chairman | Others(+) | 3,641 | DART ↗ |
| 2025-09-30 | Song Si Whan | President | Others(+) | 207,850 | DART ↗ |
| 2025-09-30 | Kim Moon Soon | Director | Others(+) | 1,235 | DART ↗ |
| 2025-09-30 | Gil Gi Hyun | Managing director | Others(+) | 14,965 | DART ↗ |
| 2025-09-30 | Kwang Sun Kwon | President | Others(+) | 33,599 | DART ↗ |
| 2025-04-28 | Tae Yong Lee | Director | Disposal of shares upon exercise of put option(-) | 64,262 | DART ↗ |
| 2025-04-28 | Kwang Sun Kwon | President | Disposal of shares upon exercise of put option(-) | 151,072 | DART ↗ |
| 2024-03-14 | Kyung Suk Kim | Adviser | Donation(-) | 50,000 | DART ↗ |