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.

Do insider buys in Korean stocks predict returns?

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

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.