Who has been buying Kosem stock?

2 distinct insiders have filed 2 disclosed insider purchases in Kosem (360350), most recently on 2026-06-29. 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 Kosem have?

Kosem has 2 buy-side and 2 sell-side disclosures on record, covering ₩134M ($93K) in total reported value, spanning 2024-02-23 to 2026-06-29.

Where does StockDrifts get Kosem 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.

Kosem 360350

Company

코셈Kosem

Insiders

Buys

Total Value

₩134M ($93K)

Avg Return

+2.64%

Last Filing

2026-06-29

Kosem (360350) has 2 disclosed insider purchases and 2 disclosed disposals on record, filed by 2 distinct insiders. Together those filings cover ₩134M ($93K) in reported transaction value. The earliest filing StockDrifts holds for Kosem is dated 2024-02-23; the most recent is 2026-06-29. 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 +2.64%, 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
2026-06-29	BUY	Market Buy	이준희 Junhee Lee	CEO	4.5K	₩7,240	-3.0%	₩33M ($23K)
2026-06-26	BUY	Market Buy	이준희 Junhee Lee	CEO	485	₩6,620	+6.0%	₩3M ($2K)
2026-05-12	SELL	Market Sell	박종칠 Park Jong-chil	Managing Director	-7.2K	₩12,300	-0.7%	₩88M ($61K)
2026-05-11	SELL	Market Sell	박종칠 Park Jong-chil	Managing Director	-740	₩13,510	+8.3%	₩10M ($7K)
2026-04-17	BUY	주식매수선택권	박종칠 Park Jong-chil	Managing Director	10.0K	₩16,360	-5.0%	₩164M ($114K)
2026-04-01	BUY	신규선임	류창형 Ryu Changhyung	Assistant Managing Director	21.3K	₩17,030	-8.7%	₩363M ($252K)
2026-03-03	SELL	증여	김용주 Yongju Kim	vice president	-56.0K	-	-	-
2025-11-28	BUY	주식매수선택권	김주봉 Kim Joo-bong	Managing Director	10.0K	₩7,500	-1.9%	₩75M ($52K)
2025-11-28	BUY	주식매수선택권	박종칠 Park Jong-chil	Managing Director	3.0K	₩7,500	-1.9%	₩23M ($16K)
2025-11-28	BUY	주식매수선택권	김용주 Yongju Kim	vice president	10.0K	₩7,500	-1.9%	₩75M ($52K)
2025-02-24	BUY	기타	오상원 Sangwon Oh	Assistant Managing Director	4.7K	₩7,010	+5.0%	₩33M ($23K)
2025-02-24	BUY	기타	김주봉 Kim Joo-bong	Managing Director	5.5K	₩7,010	+5.0%	₩39M ($27K)
2025-01-17	BUY	주식매수선택권	홍재완 Jaewan Hong	Managing Director	10.0K	₩7,930	-7.2%	₩79M ($55K)
2024-11-15	BUY	주식매수선택권	김용주 Yongju Kim	vice president	10.0K	₩6,680	+10.2%	₩67M ($46K)
2024-11-15	BUY	주식매수선택권	김주봉 Kim Joo-bong	Managing Director	10.0K	₩6,680	+10.2%	₩67M ($46K)
2024-11-15	BUY	주식매수선택권	박종칠 Park Jong-chil	Managing Director	3.0K	₩6,680	+10.2%	₩20M ($14K)
2024-08-05	BUY	주식매수선택권	김주봉 Kim Joo-bong	Managing Director	10.0K	₩7,220	+1.9%	₩72M ($50K)
2024-04-01	BUY	신규선임	권영철 Youngcheol Kwon	Assistant Managing Director	30.0K	₩20,200	-63.6%	₩606M ($421K)
2024-02-23	BUY	신규상장	박종칠 Park Jong-chil	Managing Director	72.4K	₩25,550	-71.2%	₩1.9B ($1.3M)
2024-02-23	BUY	신규상장	김용주 Yongju Kim	vice president	124.2K	₩25,550	-71.2%	₩3.2B ($2.2M)
2024-02-23	BUY	신규상장	이준희 Junhee Lee	CEO	968.6K	₩25,550	-71.2%	₩24.7B ($17.2M)
2024-02-23	BUY	신규상장	오상원 Sangwon Oh	Assistant Managing Director	9.0K	₩25,550	-71.2%	₩230M ($160K)

Frequently asked questions

Who has been buying Kosem stock?: 2 distinct insiders have filed 2 disclosed insider purchases in Kosem (360350), most recently on 2026-06-29. 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 Kosem have?: Kosem has 2 buy-side and 2 sell-side disclosures on record, covering ₩134M ($93K) in total reported value, spanning 2024-02-23 to 2026-06-29.
Where does StockDrifts get Kosem 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 Kosem. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.