SOUTH KOREA · OPENDART
J2KBIO Co., Ltd.
제이투케이바이오 · 420570 · KOSDAQ · Basic Materials · Specialty Chemicals
Score
Not ranked: no net buying on the exchange by an individual insider in the last 180 days.
Insider timeline
One insider bought, 2 times, the latest (4 May). The share closed at 8,300.00 that day and at 8,700.00 most recently (+4.8%).
Tap an item for what it means.
●A purchase: the bigger the dot, the more was bought
Each dot is one insider's purchases on one day. The dot's area follows the amount: the largest purchase here gets the largest dot. Hold the pointer over a dot to see the date and the amount.
×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, +4.4% over these six months
The closing price of each day, from 8,330.00 on 2026-04-21 to 8,700.00 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 +4.4%, the typical one −31.9%, 36.3 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 |
|---|---|---|---|---|---|---|
| Kim Seok-jong | Executive | 2 | — | 36.3M KRW | 2026-04-30 | +5.3% |
| Bae Jun-tae | Board member | — | 1 | — | — | — |
Purchases against sales
Shares of the reported value of insider transactions in the 180-day window. Sales include disposals for tax, at option exercise or under a pre-set plan, which say little about an insider's view. The split describes what was disclosed; it is not a signal.
Insiders' buying price vs the latest close
Insiders paid 8,100.74 KRW a share on average (2 purchase lines, 1 buyer, 2026-04-30 – 2026-05-04). The close on 2026-10-16 was 7.4% above that price.
The latest purchase (2026-05-04) was at 8,040.00 KRW; the close was 8.2% 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 |
|---|---|---|---|---|---|---|---|
| 2026-08-21 | Bae Jun-tae | Director | Sold on the exchange | 12,000 | ₩9,610 | ₩115.3M | DART ↗ |
| 2026-05-04 | Kim Seok-jong | Senior managing director | Bought on the exchange | 2,339 | ₩8,040 | ₩18.8M | DART ↗ |
| 2026-04-30 | Kim Seok-jong | Senior managing director | Bought on the exchange | 2,144 | ₩8,167 | ₩17.5M | DART ↗ |