SOUTH KOREA · OPENDART
SEOJIN SYSTEM CO.,LTD
서진시스템 · 178320 · KOSDAQ · Technology · Communication Equipment
Score
Not ranked: no net buying on the exchange by an individual insider in the last 180 days.
Insider timeline
No purchase in the last 180 days; 6 insiders sold.
Tap an item for what it means.
×A sale
A cross is one insider's sales on one day. People sell to pay tax, to cash in share awards or to hold less of one company, so a sale says less than a purchase does. When someone bought and sold on the same day, the cross sits beside the dot. The totals are under “Purchases against sales” below.
Blue line: this share's price, −21.5% over these six months
The closing price of each day, from 50,600.00 on 2026-04-21 to 39,700.00 on 2026-10-16. The line has no scale; read it for high and low: a dot on a low stretch was bought cheaply, a dot on a high stretch was not.
Dashed line: the typical stock on the same exchange, −31.9%
Taken from the 1525 other stocks on the same exchange that this site holds prices for. Each is measured from the first day of the window, and every day the middle one is drawn. It starts where the blue line starts, so the gap between the two is the difference: this share −21.5%, the typical one −31.9%, 10.3 points ahead. It is not an index and not a comparison within one industry.
This company: insiders buying per month, last 12 months
Darker bars are inside the 180-day window above.
Who traded
| Insider | Role | Purchases | Sales | Bought | First purchase | Share price since |
|---|---|---|---|---|---|---|
| HWANG BONG JOO | Executive | — | 1 | — | — | — |
| JUNG JONG KI | Executive | — | 1 | — | — | — |
| KO YOUNG HO | Executive | — | 2 | — | — | — |
| LEE HONG JAE | Executive | — | 1 | — | — | — |
| CHO HONG ILL | Executive | — | 1 | — | — | — |
| Kim Sungchul | Executive | — | 1 | — | — | — |
Insiders' buying price vs the latest close
Insiders paid 33,220.00 KRW a share on average (1 purchase line, 1 buyer, 2026-02-06 – 2026-02-06). The close on 2026-10-16 was 19.5% 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 |
|---|---|---|---|---|---|---|---|
| 2026-04-30 | Kim Sungchul | Senior managing director | Sold on the exchange | 6,890 | ₩60,000 | ₩413.4M | DART ↗ |
| 2026-04-30 | KO YOUNG HO | Managing director | Sold on the exchange | 12,192 | ₩59,705 | ₩727.9M | DART ↗ |
| 2026-04-30 | CHO HONG ILL | Managing director | Sold on the exchange | 6,698 | ₩58,477 | ₩391.7M | DART ↗ |
| 2026-04-29 | HWANG BONG JOO | Senior managing director | Sold on the exchange | 5,000 | ₩56,500 | ₩282.5M | DART ↗ |
| 2026-04-29 | JUNG JONG KI | Vice president | Sold on the exchange | 12,000 | ₩57,000 | ₩684.0M | DART ↗ |
| 2026-04-29 | LEE HONG JAE | Senior managing director | Sold on the exchange | 1,800 | ₩55,118 | ₩99.2M | DART ↗ |
| 2026-04-29 | KO YOUNG HO | Managing director | Sold on the exchange | 4,484 | ₩58,000 | ₩260.1M | DART ↗ |
| 2026-03-19 | CHO HONG ILL | Managing director | Sold on the exchange | 7,302 | ₩46,329 | ₩338.3M | DART ↗ |
| 2026-03-19 | LEE YOUNG DAE | Inside director | Sold on the exchange | 55,000 | ₩45,350 | ₩2.5B | DART ↗ |
| 2026-03-18 | CHO HONG ILL | Managing director | Sold on the exchange | 17,580 | ₩46,743 | ₩821.7M | DART ↗ |
| 2026-03-18 | LEE YOUNG DAE | Inside director | Sold on the exchange | 40,000 | ₩45,120 | ₩1.8B | DART ↗ |
| 2026-03-17 | JUNG JONG KI | Vice president | Sold on the exchange | 42,000 | ₩47,232 | ₩2.0B | DART ↗ |
| 2026-03-17 | CHO HONG ILL | Managing director | Sold on the exchange | 11,908 | ₩47,497 | ₩565.6M | DART ↗ |
| 2026-03-17 | LEE YOUNG DAE | Inside director | Sold on the exchange | 10,000 | ₩47,410 | ₩474.1M | DART ↗ |
| 2026-03-16 | JUNG JONG KI | Vice president | Sold on the exchange | 5,663 | ₩46,036 | ₩260.7M | DART ↗ |
| 2026-02-06 | OH DONGKUN | Vice president | Bought on the exchange | 5,000 | ₩33,220 | ₩166.1M | DART ↗ |
Other changes in holdings · 19
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 |
|---|---|---|---|---|---|
| 2026-07-10 | JUN DONG KYU | CEO | Disposal in OTC(-) | 2,500,000 | DART ↗ |
| 2026-04-07 | HWANG BONG JOO | Senior managing director | Stock options(+) | 6,000 | DART ↗ |
| 2026-04-07 | LEE HONG JAE | Senior managing director | Stock options(+) | 1,800 | DART ↗ |
| 2026-04-07 | Kim Sungchul | Senior managing director | Stock options(+) | 6,000 | DART ↗ |
| 2026-04-07 | LEE CHUNGWOO | President | Stock options(+) | 12,000 | DART ↗ |
| 2026-04-07 | JUNG JONG KI | Vice president | Stock options(+) | 12,000 | DART ↗ |
| 2026-04-07 | CHO HONG ILL | Managing director | Stock options(+) | 6,000 | DART ↗ |
| 2026-04-07 | KO YOUNG HO | Managing director | Stock options(+) | 4,200 | DART ↗ |
| 2026-04-06 | HWANG BONG JOO | Senior managing director | New appointment(+) | 5,020 | DART ↗ |
| 2026-03-26 | JUN DONG KYU | CEO | Conversion, etc.(-) | 102,127 | DART ↗ |
| 2026-03-26 | JUN DONG KYU | CEO | Exercise of convertible bond rights(+) | 102,127 | DART ↗ |
| 2026-02-26 | JUN DONG KYU | CEO | Disposal in OTC(-) | 1,043,913 | DART ↗ |
| 2026-02-26 | JUN DONG KYU | CEO | Disposal in OTC(-) | 1,043,913 | DART ↗ |
| 2026-02-03 | LEE CHUNGWOO | President | Stock options(+) | 18,000 | DART ↗ |
| 2026-02-03 | LEE YOUNG DAE | Inside director | Stock options(+) | 40,000 | DART ↗ |
| 2026-02-03 | LEE YOUNG DAE | Inside director | Stock options(+) | 84,000 | DART ↗ |
| 2025-12-23 | JEON DONG KYU | CEO | Others(+) | 102,127 | DART ↗ |
| 2024-10-30 | JEON DONG KYU | CEO | 기타(+) | 240,000 | DART ↗ |
| 2024-07-05 | KO YOUNG HO | Managing director | Treasury stock bonus(+) | 284 | DART ↗ |