SOUTH KOREA · OPENDART
Justem.CO.,LTD
저스템 · 417840 · KOSDAQ · Technology · Semiconductor Equipment & Materials
Score
Not ranked: no net buying on the exchange by an individual insider in the last 180 days.
Insider timeline
2 insiders bought within 7 days, 13 May to 19 May: 1 Executive, 1 Board member. 1 of them bought again later. The share closed at 17,030.00 on the first of those days and at 15,770.00 most recently (−7.4%).
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.
▮Purple band: several insiders bought within 15 days
The band marks the stretch with the most different buyers: at most 15 days long and at least two people. Here it is 13 May – 19 May, with 2 insiders. Only the strongest stretch is marked. Several people deciding the same thing is harder to explain by one person's private reasons, but insiders often buy together just after a closed period ends, so compare it with the grey weekly bars.
Blue line: this share's price, +43.1% over these six months
The closing price of each day, from 11,020.00 on 2026-04-21 to 15,770.00 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 +43.1%, the typical one −31.9%, 75.0 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 Sun Sig | Executive | 5 | — | 40.3M KRW | 2026-05-12 | +20.4% |
| Bae Do In | Executive | — | 1 | — | — | — |
| An Ho Sang | Board member | 2 | — | 80.5M KRW | 2026-05-14 | −8.6% |
| Lim Jin Soo | 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 16,324.22 KRW a share on average (7 purchase lines, 2 buyers, 2026-05-12 – 2026-06-19). The close on 2026-10-16 was 3.4% below that price.
The latest purchase (2026-06-19) was at 14,600.00 KRW; the close was 8.0% 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 |
|---|---|---|---|---|---|---|---|
| 2026-06-19 | Kim Sun Sig | Vice president | Bought on the exchange | 400 | ₩14,600 | ₩5.8M | DART ↗ |
| 2026-06-01 | Kim Sun Sig | Vice president | Bought on the exchange | 300 | ₩16,500 | ₩5.0M | DART ↗ |
| 2026-05-28 | Kim Sun Sig | Vice president | Bought on the exchange | 500 | ₩18,000 | ₩9.0M | DART ↗ |
| 2026-05-21 | Bae Do In | Vice president | Sold on the exchange | 10,000 | ₩19,670 | ₩196.7M | DART ↗ |
| 2026-05-19 | Lim Jin Soo | Director | Sold on the exchange | 5,000 | ₩19,500 | ₩97.5M | DART ↗ |
| 2026-05-19 | An Ho Sang | Director | Bought on the exchange | 1,000 | ₩18,038 | ₩18.0M | DART ↗ |
| 2026-05-14 | An Ho Sang | Director | Bought on the exchange | 4,000 | ₩15,620 | ₩62.5M | DART ↗ |
| 2026-05-13 | Kim Sun Sig | Vice president | Bought on the exchange | 600 | ₩16,775 | ₩10.1M | DART ↗ |
| 2026-05-12 | Kim Sun Sig | Vice president | Bought on the exchange | 600 | ₩17,377 | ₩10.4M | DART ↗ |
| 2026-04-15 | Gwon Tae Ho | Auditor | Sold on the exchange | 7,500 | ₩9,136 | ₩68.5M | DART ↗ |
Other changes in holdings · 33
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 |
|---|---|---|---|---|---|
| 2026-09-04 | Park Tai-su | Vice president | Stock options(+) | 15,000 | DART ↗ |
| 2026-09-04 | Bae Do In | Vice president | Stock options(+) | 16,500 | DART ↗ |
| 2026-09-04 | Na Dong Geun | Vice president | Stock options(+) | 11,000 | DART ↗ |
| 2026-09-04 | Kim Yong Jin | COO | Stock options(+) | 15,000 | DART ↗ |
| 2026-06-01 | Lim Jin Soo | Director | Stock options(+) | 5,000 | DART ↗ |
| 2026-06-01 | Bae Do In | Vice president | Stock options(+) | 30,000 | DART ↗ |
| 2026-06-01 | Na Dong Geun | Vice president | Stock options(+) | 22,000 | DART ↗ |
| 2026-06-01 | Cho Kwang Hee | Outside director | Stock options(+) | 7,500 | DART ↗ |
| 2026-05-27 | Lee Mi Ae | Vice president | Off-hour trading(-) | 150,000 | DART ↗ |
| 2026-05-27 | Ha Jung Min | Vice president | Off-hour trading(-) | 50,000 | DART ↗ |
| 2026-05-27 | Kim Yong Jin | COO | Off-hour trading(-) | 200,000 | DART ↗ |
| 2026-05-27 | Lim Young Jin | CEO | Off-hour trading(-) | 200,000 | DART ↗ |
| 2026-03-31 | Woo In Keun | Director | Treasury stock bonus(+) | 4,500 | DART ↗ |
| 2026-03-31 | Lee Mi Ae | Vice president | Treasury stock bonus(+) | 6,300 | DART ↗ |
| 2026-03-31 | Ha Jung Min | Vice president | Treasury stock bonus(+) | 6,300 | DART ↗ |
| 2026-03-31 | Kim Yong Jin | COO | Treasury stock bonus(+) | 6,300 | DART ↗ |
| 2026-03-31 | Lim Young Jin | CEO | Treasury stock bonus(+) | 72,377 | DART ↗ |
| 2026-03-12 | Ha Jung Min | Vice president | Stock options(+) | 19,000 | DART ↗ |
| 2026-03-12 | Lim Jin Soo | Director | Stock options(+) | 5,000 | DART ↗ |
| 2026-03-12 | Woo In Keun | Director | Stock options(+) | 19,500 | DART ↗ |
| 2026-03-12 | Gwon Tae Ho | Auditor | Stock options(+) | 7,500 | DART ↗ |
| 2026-03-12 | Ko Dae Hong | Outside director | Stock options(+) | 10,500 | DART ↗ |
| 2026-01-02 | Kim Yong Jin | COO | Acquisition of new shares without compensation(+) | 462,000 | DART ↗ |
| 2026-01-02 | Na Dong Geun | Vice president | Acquisition of new shares without compensation(+) | 92,400 | DART ↗ |
| 2026-01-02 | Ko Dae Hong | Outside director | Acquisition of new shares without compensation(+) | 19,000 | DART ↗ |
| 2026-01-02 | Ha Jung Min | Vice president | Acquisition of new shares without compensation(+) | 34,000 | DART ↗ |
| 2026-01-02 | Park Tai-su | Vice president | Acquisition of new shares without compensation(+) | 10,000 | DART ↗ |
| 2026-01-02 | Hwang Hee Soo | Vice president | Acquisition of new shares without compensation(+) | 4,000 | DART ↗ |
| 2026-01-02 | Bae Do In | Vice president | Acquisition of new shares without compensation(+) | 18,000 | DART ↗ |
| 2026-01-02 | Lee Mi Ae | Vice president | Acquisition of new shares without compensation(+) | 325,700 | DART ↗ |
| 2026-01-02 | Lim Young Jin | CEO | Acquisition of new shares without compensation(+) | 3,802,748 | DART ↗ |
| 2025-05-02 | Lee Mi Ae | Vice president | Stock options(+) | 1,150 | DART ↗ |
| 2025-05-02 | Ha Jung Min | Vice president | Stock options(+) | 5,000 | DART ↗ |