Who has been buying koise stock?

1 distinct insiders have filed 6 disclosed insider purchases in koise (121850), most recently on 2026-01-30. 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 koise have?

koise has 6 buy-side and 0 sell-side disclosures on record, covering ₩930M ($646K) in total reported value, spanning 2024-03-08 to 2026-01-30.

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.

koise 121850

Company

코이즈koise

Insiders

Buys

Total Value

₩930M ($646K)

Avg Return

-72.10%

Last Filing

2026-01-30

koise (121850) has 6 disclosed insider purchases and 0 disclosed disposals on record, filed by 1 distinct insiders. Together those filings cover ₩930M ($646K) in reported transaction value. The earliest filing StockDrifts holds for koise is dated 2024-03-08; the most recent is 2026-01-30. Across these filings the average return since disclosure is -72.10%, 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
2026-09-15	BUY	Market Buy	최연주 Yeonju Choi	-	318.7K	-	-	-
2026-09-14	BUY	Market Buy	최연주 Yeonju Choi	-	394.4K	-	-	-
2026-09-11	BUY	Market Buy	최연주 Yeonju Choi	-	22.1K	₩135	+0.0%	₩6M ($4K)
2026-09-10	BUY	Market Buy	최연주 Yeonju Choi	-	120.6K	₩265	-49.1%	₩27M ($19K)
2026-09-09	BUY	Market Buy	최연주 Yeonju Choi	-	195.4K	₩480	-71.9%	₩57M ($40K)
2026-09-08	BUY	Market Buy	최연주 Yeonju Choi	-	101.2K	₩480	-71.9%	₩32M ($23K)
2026-01-30	SELL	기타	조재형 Jaehyung Jo	CEO	-39.6K	₩3,530	+15.0%	₩140M ($97K)
2026-01-30	BUY	유상신주취득	조재형 Jaehyung Jo	CEO	47.5K	₩3,530	-15.0%	₩168M ($116K)
2026-01-08	SELL	장외매도	조준호 Junho Jo	moving	-28.4K	₩3,930	+23.7%	₩112M ($78K)
2026-01-08	SELL	장외매도	조재형 Jaehyung Jo	CEO	-519.5K	₩3,930	+23.7%	₩2.0B ($1.4M)
2026-01-08	SELL	장외매도	최연주 Yeonju Choi	moving	-175.8K	₩3,930	+23.7%	₩691M ($480K)
2026-01-02	BUY	무상신주취득	조재형 Jaehyung Jo	CEO	559.1K	₩4,360	-31.2%	₩2.4B ($1.7M)
2026-01-02	BUY	무상신주취득	조준호 Junho Jo	moving	28.4K	₩4,360	-31.2%	₩124M ($86K)
2026-01-02	BUY	무상신주취득	최연주 Yeonju Choi	moving	175.8K	₩4,360	-31.2%	₩767M ($532K)
2025-11-19	SELL	자본감소	조재형 Jaehyung Jo	CEO	-5.1M	₩5,835	+48.6%	₩29.7B ($20.6M)
2025-11-19	SELL	자본감소	최연주 Yeonju Choi	moving	-1.6M	₩5,835	+48.6%	₩9.3B ($6.5M)
2025-11-19	SELL	자본감소	조준호 Junho Jo	moving	-258.7K	₩5,835	+48.6%	₩1.5B ($1.0M)
2024-09-04	BUY	Market Buy	조재형 Jaehyung Jo	CEO	10.0K	₩8,933	-66.4%	₩89M ($62K)
2024-09-03	BUY	Market Buy	조재형 Jaehyung Jo	CEO	20.0K	₩9,150	-67.2%	₩183M ($127K)
2024-09-02	BUY	Market Buy	조재형 Jaehyung Jo	CEO	10.8K	₩9,285	-67.7%	₩100M ($69K)
2024-03-14	BUY	Market Buy	조재형 Jaehyung Jo	CEO	13.5K	₩13,333	-77.5%	₩180M ($125K)
2024-03-12	BUY	Market Buy	조재형 Jaehyung Jo	CEO	8.7K	₩13,250	-77.4%	₩116M ($80K)
2024-03-08	BUY	Market Buy	조재형 Jaehyung Jo	CEO	20.5K	₩12,724	-76.4%	₩261M ($181K)

Frequently asked questions

Who has been buying koise stock?: 1 distinct insiders have filed 6 disclosed insider purchases in koise (121850), most recently on 2026-01-30. 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 koise have?: koise has 6 buy-side and 0 sell-side disclosures on record, covering ₩930M ($646K) in total reported value, spanning 2024-03-08 to 2026-01-30.
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.