Who has been buying coseth stock?

1 distinct insiders have filed 15 disclosed insider purchases in coseth (089890), most recently on 2025-12-06. Each filer, their role, the number of shares and the price at filing are listed in the table on this page.

How many insider filings does coseth have?

coseth has 15 buy-side and 7 sell-side disclosures on record, covering ₩4.3B ($3.0M) in total reported value, spanning 2018-06-15 to 2025-12-06.

Where does StockDrifts get coseth insider data?

From DART D001/D002 insider disclosures — the official filing system run by the Financial Supervisory Service (Korea). StockDrifts parses each disclosure and matches it to daily price history; the original filings remain available directly from DART.

Do insider buys in Korean stocks predict returns?

Not uniformly. StockDrifts analysed 170,720 share-count changes across 56,930 Korean DART filings using cross-sectional alpha at fixed forward horizons, and found returns concentrated in particular signal tiers rather than in insider buying generally.

coseth 089890

Company

코세스coseth

Insiders

Buys

Total Value

₩4.3B ($3.0M)

Avg Return

+139.16%

Last Filing

2025-12-06

coseth (089890) has 15 disclosed insider purchases and 7 disclosed disposals on record, filed by 1 distinct insiders. Together those filings cover ₩4.3B ($3.0M) in reported transaction value. The earliest filing StockDrifts holds for coseth is dated 2018-06-15; the most recent is 2025-12-06. All of it is parsed from DART D001/D002 insider disclosures, the official disclosure system operated by the Financial Supervisory Service (Korea). Across these filings the average return since disclosure is +139.16%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent insider trades

Date	Type	Source	Insider	Position	Shares	Price at filing	Return	Value
2025-12-06	SELL	Market Sell	박명순 Park Myung-soon	CEO	-3.0K	₩25,500	+13.1%	₩77M ($53K)
2025-12-05	SELL	Market Sell	박명순 Park Myung-soon	CEO	-15.1K	₩25,400	+12.8%	₩382M ($266K)
2025-12-02	SELL	Market Sell	박명순 Park Myung-soon	CEO	-24.0K	₩25,900	+14.5%	₩622M ($432K)
2025-12-01	SELL	Market Sell	박명순 Park Myung-soon	CEO	-33.2K	₩28,250	+21.6%	₩939M ($652K)
2025-11-28	SELL	Market Sell	박명순 Park Myung-soon	CEO	-14.9K	₩29,450	+24.8%	₩438M ($304K)
2025-11-24	SELL	Market Sell	박명순 Park Myung-soon	CEO	-15.2K	₩26,350	+15.9%	₩400M ($278K)
2025-11-21	SELL	Market Sell	박명순 Park Myung-soon	CEO	-7.2K	₩26,150	+15.3%	₩189M ($131K)
2025-11-21	BUY	Market Buy	박명순 Park Myung-soon	CEO	200	₩26,150	-15.3%	₩5M ($4K)
2025-04-15	BUY	Market Buy	박명순 Park Myung-soon	CEO	2.8K	₩6,950	+218.7%	₩19M ($13K)
2025-04-14	BUY	Market Buy	박명순 Park Myung-soon	CEO	3.3K	₩6,870	+222.4%	₩23M ($16K)
2025-04-11	BUY	Market Buy	박명순 Park Myung-soon	CEO	8.0K	₩6,680	+231.6%	₩53M ($37K)
2025-04-10	BUY	Market Buy	박명순 Park Myung-soon	CEO	10.0K	₩6,560	+237.7%	₩66M ($46K)
2025-02-18	BUY	Market Buy	박명순 Park Myung-soon	CEO	9.1K	₩7,800	+184.0%	₩71M ($49K)
2025-02-17	BUY	Market Buy	박명순 Park Myung-soon	CEO	2.8K	₩7,730	+186.6%	₩21M ($15K)
2025-02-14	BUY	Market Buy	박명순 Park Myung-soon	CEO	9.1K	₩7,710	+187.3%	₩70M ($49K)
2025-02-13	BUY	Market Buy	박명순 Park Myung-soon	CEO	7.9K	₩7,290	+203.8%	₩57M ($40K)
2025-02-10	BUY	Market Buy	박명순 Park Myung-soon	CEO	2.4K	₩7,500	+195.3%	₩18M ($13K)
2025-02-07	BUY	Market Buy	박명순 Park Myung-soon	CEO	8.1K	₩7,250	+205.5%	₩59M ($41K)
2025-02-06	BUY	Market Buy	박명순 Park Myung-soon	CEO	12.0K	₩7,150	+209.8%	₩86M ($60K)
2024-12-20	BUY	Market Buy	박명순 Park Myung-soon	CEO	88.3K	₩6,480	+241.8%	₩572M ($397K)
2024-12-16	BUY	Market Buy	박명순 Park Myung-soon	CEO	7.0K	₩6,980	+217.3%	₩49M ($34K)
2024-12-13	BUY	Market Buy	박명순 Park Myung-soon	CEO	7.6K	₩6,990	+216.9%	₩53M ($37K)
2018-06-15	BUY	무상신주취득	박명순 Park Myung-soon	CEO	4.1M	₩4,750	+366.3%	₩19.4B ($13.5M)

Frequently asked questions

Who has been buying coseth stock?: 1 distinct insiders have filed 15 disclosed insider purchases in coseth (089890), most recently on 2025-12-06. Each filer, their role, the number of shares and the price at filing are listed in the table on this page.
How many insider filings does coseth have?: coseth has 15 buy-side and 7 sell-side disclosures on record, covering ₩4.3B ($3.0M) in total reported value, spanning 2018-06-15 to 2025-12-06.
Where does StockDrifts get coseth insider data?: From DART D001/D002 insider disclosures — the official filing system run by the Financial Supervisory Service (Korea). StockDrifts parses each disclosure and matches it to daily price history; the original filings remain available directly from DART.
Do insider buys in Korean stocks predict returns?: Not uniformly. StockDrifts analysed 170,720 share-count changes across 56,930 Korean DART filings using cross-sectional alpha at fixed forward horizons, and found returns concentrated in particular signal tiers rather than in insider buying generally.

Source filings

Every trade listed above is disclosed in DART D001/D002 insider disclosures, filed with the Financial Supervisory Service (Korea). View the original DART filings for coseth. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.