Stock Trading Canary

Built: 2026-10-19T16:02:49+00:00 · 中文

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SOUTH KOREA · OPENDART

Clean & Science Co., Ltd

크린앤사이언스 · 045520 · KOSDAQ · Industrials · Specialty Industrial Machinery

Score

71.3

Rank 111 of 745 · KR-v1 · as of 2026-10-18

Buyers 35%60
Size 25%52
Role 20%90
Recency 10%92
Conviction 10%100

Insider timeline

2 insiders bought on the same day, 12 Aug: 1 Board member, 1 Executive. 2 of them bought again later. 1 more bought afterwards. The share closed at 2,980.00 that day and at 3,205.00 most recently (+7.6%).

Several insiders within 15 days: 2026-08-12 – 2026-08-12LEE HAN OKLEE HAN OKMember of the executive committeeExecutiveChoi Jae wonChoi Jae wonDirectorBoard memberChoi Jae hoChoi Jae hoDirectorBoard member2026-08-04 · LEE HAN OK · purchase · 1,425,000 KRW2026-08-05 · LEE HAN OK · purchase · 7,060,000 KRW2026-08-11 · Choi Jae won · purchase · 29,278,645 KRW2026-08-12 · Choi Jae won · purchase · 9,078,000 KRW2026-08-12 · LEE HAN OK · purchase · 2,128,700 KRW2026-09-07 · Choi Jae won · purchase · 9,739,199 KRW2026-09-08 · Choi Jae won · purchase · 7,515,814 KRW2026-09-09 · Choi Jae won · purchase · 10,376,426 KRW2026-09-11 · Choi Jae won · purchase · 10,001,205 KRW2026-09-18 · Choi Jae won · purchase · 9,600,000 KRW2026-09-18 · LEE HAN OK · purchase · 4,166,500 KRW2026-09-21 · Choi Jae won · purchase · 12,124,515 KRW2026-10-12 · Choi Jae ho · purchase · 6,159,890 KRW2026-10-13 · Choi Jae ho · purchase · 2,066,925 KRWMayJunJulAugSepOct

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 12 Aug, 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, −11.1% over these six months

The closing price of each day, from 3,605.00 on 2026-04-21 to 3,205.00 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 −11.1%, the typical one −31.9%, 20.8 points ahead. It is not an index and not a comparison within one industry.

This company: insiders buying per month, last 12 months

Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
2Aug
2Sep
1Oct

Darker bars are inside the 180-day window above.

Who traded

InsiderRolePurchasesSalesBoughtFirst purchaseShare price since
LEE HAN OKExecutive4—14.8M KRW2026-08-04+12.5%
Choi Jae wonBoard member8—97.7M KRW2026-08-11+5.3%
Choi Jae hoBoard member2—8.2M KRW2026-10-12+0.5%

Insiders' buying price vs the latest close

Insiders paid 3,049.89 KRW a share on average (14 purchase lines, 3 buyers, 2026-08-04 – 2026-10-13). The close on 2026-10-16 was 5.1% above that price.

The latest purchase (2026-10-13) was at 3,175.00 KRW; the close was 0.9% 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 dateInsiderRoleTradeSharesPriceValueFiling
2026-10-13Choi Jae hoDirectorBought on the exchange651₩3,175₩2.1MDART ↗
2026-10-12Choi Jae hoDirectorBought on the exchange1,931₩3,190₩6.2MDART ↗
2026-09-21Choi Jae wonDirectorBought on the exchange3,783₩3,205₩12.1MDART ↗
2026-09-18Choi Jae wonDirectorBought on the exchange3,000₩3,200₩9.6MDART ↗
2026-09-18LEE HAN OKManaging directorBought on the exchange1,300₩3,205₩4.2MDART ↗
2026-09-11Choi Jae wonDirectorBought on the exchange3,105₩3,221₩10.0MDART ↗
2026-09-09Choi Jae wonDirectorBought on the exchange3,502₩2,963₩10.4MDART ↗
2026-09-08Choi Jae wonDirectorBought on the exchange2,566₩2,929₩7.5MDART ↗
2026-09-07Choi Jae wonDirectorBought on the exchange3,397₩2,867₩9.7MDART ↗
2026-08-12LEE HAN OKManaging directorBought on the exchange700₩3,041₩2.1MDART ↗
2026-08-12Choi Jae wonDirectorBought on the exchange3,000₩3,026₩9.1MDART ↗
2026-08-11Choi Jae wonDirectorBought on the exchange9,647₩3,035₩29.3MDART ↗
2026-08-05LEE HAN OKManaging directorBought on the exchange2,500₩2,824₩7.1MDART ↗
2026-08-04LEE HAN OKManaging directorBought on the exchange500₩2,850₩1.4MDART ↗
Other changes in holdings · 12

Option exercises, grants, new shares, inheritance, gifts, off-exchange trades and trades by companies and funds. Not counted in the score.

DateInsiderRoleReasonSharesFiling
2026-09-30Evangelina Pte., Ltd.10% shareholderAcquisition in exchange(+)3,943DART ↗
2026-09-29Delta PDS Co., Ltd.10% shareholderAcquisition in exchange(+)10,000DART ↗
2026-09-29Evangelina Pte., Ltd.10% shareholderAcquisition in exchange(+)5,137DART ↗
2026-09-28Evangelina Pte., Ltd.10% shareholderAcquisition in exchange(+)14,187DART ↗
2026-09-22Delta PDS Co., Ltd.10% shareholderAcquisition in exchange(+)10,000DART ↗
2026-09-21Delta PDS Co., Ltd.10% shareholderAcquisition in exchange(+)2,403DART ↗
2026-09-18Delta PDS Co., Ltd.10% shareholderAcquisition in exchange(+)14,000DART ↗
2026-09-17Delta PDS Co., Ltd.10% shareholderAcquisition in exchange(+)14,163DART ↗
2026-09-16Delta PDS Co., Ltd.10% shareholderAcquisition in exchange(+)15,399DART ↗
2026-08-13Evangelina Pte., Ltd.10% shareholderAcquisition in exchange(+)11,611DART ↗
2026-08-12Evangelina Pte., Ltd.10% shareholderAcquisition in exchange(+)11,011DART ↗
2026-08-11Delta PDS Co., Ltd.10% shareholderAcquisition in exchange(+)50,660DART ↗