SOUTH KOREA · OPENDART
SAMICK THK CO.,LTD
삼익THK · 004380 · KOSPI · Technology · Semiconductor Equipment & Materials
Score
52.5
Insider timeline
2 insiders bought within 10 days, 4 May to 13 May: 1 Executive, 1 CEO / chair. 1 of them bought again later. The share closed at 11,870.00 on the first of those days and at 7,250.00 most recently (−38.9%).
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.
▮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 4 May – 13 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, −38.7% over these six months
The closing price of each day, from 11,820.00 on 2026-04-21 to 7,250.00 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, −20.4%
Taken from the 685 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 −38.7%, the typical one −20.4%, 18.3 points behind. 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 Jong-su | Executive | 3 | — | 24.0M KRW | 2026-04-27 | −40.5% |
| Ryu Yeong-su | CEO / chair | 3 | — | 128.7M KRW | 2026-05-12 | −36.7% |
Insiders' buying price vs the latest close
Insiders paid 12,724.71 KRW a share on average (6 purchase lines, 2 buyers, 2026-04-27 – 2026-05-28). The close on 2026-10-16 was 43.0% below that price.
The latest purchase (2026-05-28) was at 11,160.00 KRW; the close was 35.0% below 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 |
|---|---|---|---|---|---|---|---|
| 2026-05-28 | Ryu Yeong-su | CEO | Bought on the exchange | 2,500 | ₩11,160 | ₩27.9M | DART ↗ |
| 2026-05-13 | Ryu Yeong-su | CEO | Bought on the exchange | 5,000 | ₩13,800 | ₩69.0M | DART ↗ |
| 2026-05-12 | Ryu Yeong-su | CEO | Bought on the exchange | 2,500 | ₩12,700 | ₩31.8M | DART ↗ |
| 2026-05-04 | Kim Jong-su | Vice president | Bought on the exchange | 1,350 | ₩11,940 | ₩16.1M | DART ↗ |
| 2026-04-28 | Kim Jong-su | Vice president | Bought on the exchange | 250 | ₩11,950 | ₩3.0M | DART ↗ |
| 2026-04-27 | Kim Jong-su | Vice president | Bought on the exchange | 400 | ₩12,350 | ₩4.9M | DART ↗ |
Other changes in holdings · 2
Option exercises, grants, new shares, inheritance, gifts, off-exchange trades and trades by companies and funds. Not counted in the score.