SOUTH KOREA · OPENDART
3S KOREA CO., LTD
3S · 060310 · KOSDAQ · Technology · Semiconductor Equipment & Materials
Score
49.9
Insider timeline
One insider bought, 4 times, the latest (1 Sep). The share closed at 1,147.00 that day and at 1,335.00 most recently (+16.4%).
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.
Blue line: this share's price, −4.7% over these six months
The closing price of each day, from 1,401.00 on 2026-04-21 to 1,335.00 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 −4.7%, the typical one −31.9%, 27.2 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 |
|---|---|---|---|---|---|---|
| JUNG WAN YOUNG | CEO / chair | 4 | — | 174.0M KRW | 2026-08-27 | +20.8% |
Insiders' buying price vs the latest close
Insiders paid 1,160.03 KRW a share on average (4 purchase lines, 1 buyer, 2026-08-27 – 2026-09-01). The close on 2026-10-16 was 15.1% above that price.
The latest purchase (2026-09-01) was at 1,150.00 KRW; the close was 16.1% 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 |
|---|---|---|---|---|---|---|---|
| 2026-09-01 | JUNG WAN YOUNG | CEO | Bought on the exchange | 24,735 | ₩1,150 | ₩28.4M | DART ↗ |
| 2026-08-31 | JUNG WAN YOUNG | CEO | Bought on the exchange | 52,700 | ₩1,160 | ₩61.1M | DART ↗ |
| 2026-08-28 | JUNG WAN YOUNG | CEO | Bought on the exchange | 12,565 | ₩1,118 | ₩14.0M | DART ↗ |
| 2026-08-27 | JUNG WAN YOUNG | CEO | Bought on the exchange | 60,000 | ₩1,173 | ₩70.4M | DART ↗ |
Other changes in holdings · 47
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 |
|---|---|---|---|---|---|
| 2026-06-30 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 72,000 | DART ↗ |
| 2026-06-29 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 104,000 | DART ↗ |
| 2026-06-26 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 160,000 | DART ↗ |
| 2026-06-25 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 271,805 | DART ↗ |
| 2026-06-24 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 73,382 | DART ↗ |
| 2026-06-23 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 40,500 | DART ↗ |
| 2026-06-22 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 66,015 | DART ↗ |
| 2026-06-19 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 37,887 | DART ↗ |
| 2026-06-18 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 19,038 | DART ↗ |
| 2026-06-17 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 781 | DART ↗ |
| 2026-06-16 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 60,415 | DART ↗ |
| 2025-03-27 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 5,433,417 | DART ↗ |
| 2025-03-26 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 948 | DART ↗ |
| 2025-03-25 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 93,673 | DART ↗ |
| 2025-03-24 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 11,142 | DART ↗ |
| 2025-03-21 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 9,500 | DART ↗ |
| 2025-03-20 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 15,608 | DART ↗ |
| 2025-03-19 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 12,728 | DART ↗ |
| 2025-03-18 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 64,917 | DART ↗ |
| 2025-03-11 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 48,442 | DART ↗ |
| 2025-02-24 | Korea Wafer Holdings Limited | 10% shareholder | Disposal in exchange(-) | 117,355 | DART ↗ |
| 2025-02-19 | Korea Wafer Holdings Limited | 10% shareholder | Disposal in exchange(-) | 40,000 | DART ↗ |
| 2025-02-10 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 3,702 | DART ↗ |
| 2025-02-07 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 14,261 | DART ↗ |
| 2025-02-06 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 47,397 | DART ↗ |
| 2025-02-04 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 56,205 | DART ↗ |
| 2025-02-03 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 123,011 | DART ↗ |
| 2025-01-22 | Korea Wafer Holdings Limited | 10% shareholder | Disposal in exchange(-) | 13,000 | DART ↗ |
| 2024-12-10 | Korea Wafer Holdings Limited | 10% shareholder | Disposal in exchange(-) | 15,000 | DART ↗ |
| 2024-12-09 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 89,140 | DART ↗ |
| 2024-12-06 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 80,163 | DART ↗ |
| 2024-12-05 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 61,782 | DART ↗ |
| 2024-12-04 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 917 | DART ↗ |
| 2024-12-03 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 22,555 | DART ↗ |
| 2024-12-02 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 57,050 | DART ↗ |
| 2024-11-29 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 27,236 | DART ↗ |
| 2024-11-28 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 31,660 | DART ↗ |
| 2024-11-27 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 1,396 | DART ↗ |
| 2024-11-21 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 14,434 | DART ↗ |
| 2024-11-21 | Kim Se-Wan | CEO | 제3자배정유상증자(+) | 77,120 | DART ↗ |
| 2024-11-15 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 10,988 | DART ↗ |
| 2024-11-14 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 39,948 | DART ↗ |
| 2024-11-13 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 60,534 | DART ↗ |
| 2024-11-12 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 33,000 | DART ↗ |
| 2024-11-11 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 58,773 | DART ↗ |
| 2024-11-08 | Korea Wafer Holdings Limited | 10% shareholder | Acquisition in exchange(+) | 26,227 | DART ↗ |
| 2024-10-20 | Kim Se-Wan | CEO | 제3자배정유상증자(+) | 77,120 | DART ↗ |