Who has been buying Doinsis stock?

2 distinct insiders have filed 0 disclosed insider purchases in Doinsis (484120), most recently on 2026-04-01. 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 Doinsis have?

Doinsis has 0 buy-side and 21 sell-side disclosures on record, covering ₩190M ($132K) in total reported value, spanning 2025-07-23 to 2026-04-01.

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.

Doinsis 484120

Company

도우인시스Doinsis

Insiders

Buys

Total Value

₩190M ($132K)

Avg Return

+3.24%

Last Filing

2026-04-01

Doinsis (484120) has 0 disclosed insider purchases and 21 disclosed disposals on record, filed by 2 distinct insiders. Together those filings cover ₩190M ($132K) in reported transaction value. The earliest filing StockDrifts holds for Doinsis is dated 2025-07-23; the most recent is 2026-04-01. Across these filings the average return since disclosure is +3.24%, 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
2026-10-28	SELL	Market Sell	차경용 Cha Kyung-yong	committee member	-500	₩25,300	+18.2%	₩13M ($9K)
2026-10-27	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-500	₩27,600	+25.0%	₩14M ($10K)
2026-10-27	SELL	Market Sell	차경용 Cha Kyung-yong	committee member	-500	₩27,600	+25.0%	₩14M ($10K)
2026-10-27	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-500	₩27,600	+25.0%	₩14M ($10K)
2026-10-27	SELL	Market Sell	차경용 Cha Kyung-yong	committee member	-500	₩27,600	+25.0%	₩14M ($10K)
2026-10-27	SELL	Market Sell	차경용 Cha Kyung-yong	committee member	-500	₩27,600	+25.0%	₩14M ($10K)
2026-10-22	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-400	₩24,550	-14.5%	₩10M ($7K)
2026-10-22	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-300	₩24,550	-14.5%	₩7M ($5K)
2026-10-22	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-5.3K	₩24,550	-14.5%	₩131M ($91K)
2026-10-22	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-1.1K	₩24,550	-14.5%	₩28M ($19K)
2026-10-22	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-500	₩24,550	-14.5%	₩12M ($9K)
2026-10-22	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-700	₩24,550	-14.5%	₩17M ($12K)
2026-10-22	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-600	₩24,550	-14.5%	₩15M ($10K)
2026-10-22	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-51	₩24,550	-14.5%	₩1M ($869)
2026-10-22	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-559	₩24,550	-14.5%	₩14M ($10K)
2026-10-22	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-36	₩24,550	-14.5%	₩884K ($614)
2026-10-22	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-400	₩24,550	-14.5%	₩10M ($7K)
2026-10-20	SELL	Market Sell	차경용 Cha Kyung-yong	committee member	-1.3K	₩22,550	-7.3%	₩29M ($20K)
2026-10-16	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-1.0K	₩24,150	-0.2%	₩24M ($17K)
2026-10-16	SELL	Market Sell	차경용 Cha Kyung-yong	committee member	-1.2K	₩24,150	-0.2%	₩29M ($20K)
2026-10-16	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-1.0K	₩24,150	-0.2%	₩24M ($17K)
2026-10-14	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-1.0K	₩24,150	-0.2%	₩24M ($17K)
2026-10-13	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-918	₩24,150	-0.2%	₩22M ($15K)
2026-09-29	SELL	Market Sell	차경용 Cha Kyung-yong	committee member	-1.0K	₩24,250	+5.0%	₩24M ($17K)
2026-09-29	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-2.0K	₩24,250	+5.0%	₩49M ($34K)
2026-04-01	BUY	신규선임	최규호 Gyuho Choi	Management Support Director	200	₩19,550	+7.2%	₩4M ($3K)
2026-03-31	SELL	장외매도	에스브이아이씨55호신기술사업투자조합 SVIC 55 Hoshin Technology Business Investment Association	-	-484.7K	₩18,700	-12.0%	₩9.1B ($6.3M)
2026-02-24	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-253	₩23,800	+3.1%	₩6M ($4K)
2026-02-12	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-1.0K	₩23,800	+1.3%	₩24M ($17K)
2026-02-11	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-262	₩24,100	+2.5%	₩6M ($4K)
2026-02-11	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-738	₩24,100	+2.5%	₩18M ($12K)
2026-02-03	SELL	Market Sell	송영남 Youngnam Song	committee member	-100	₩24,350	+3.5%	₩2M ($2K)
2026-02-03	SELL	Market Sell	송영남 Youngnam Song	committee member	-300	₩24,350	+3.5%	₩7M ($5K)
2026-02-03	SELL	Market Sell	송영남 Youngnam Song	committee member	-290	₩24,350	+3.5%	₩7M ($5K)
2026-02-03	SELL	Market Sell	송영남 Youngnam Song	committee member	-100	₩24,350	+3.5%	₩2M ($2K)
2026-01-30	SELL	Market Sell	송영남 Youngnam Song	committee member	-300	₩24,150	+2.7%	₩7M ($5K)
2026-01-30	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-122	₩24,150	+2.7%	₩3M ($2K)
2026-01-30	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-500	₩24,150	+2.7%	₩12M ($8K)
2026-01-30	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-500	₩24,150	+2.7%	₩12M ($8K)
2026-01-30	SELL	Market Sell	송영남 Youngnam Song	committee member	-500	₩24,150	+2.7%	₩12M ($8K)
2026-01-30	SELL	Market Sell	송영남 Youngnam Song	committee member	-500	₩24,150	+2.7%	₩12M ($8K)
2026-01-30	SELL	Market Sell	송영남 Youngnam Song	committee member	-500	₩24,150	+2.7%	₩12M ($8K)
2026-01-30	SELL	Market Sell	송영남 Youngnam Song	committee member	-500	₩24,150	+2.7%	₩12M ($8K)
2026-01-30	SELL	Market Sell	송영남 Youngnam Song	committee member	-500	₩24,150	+2.7%	₩12M ($8K)
2026-01-30	SELL	Market Sell	송영남 Youngnam Song	committee member	-320	₩24,150	+2.7%	₩8M ($5K)
2026-01-29	SELL	Market Sell	송영남 Youngnam Song	committee member	-190	₩25,050	+6.2%	₩5M ($3K)
2026-01-28	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-300	₩25,200	+6.8%	₩8M ($5K)
2026-01-28	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-300	₩25,200	+6.8%	₩8M ($5K)
2026-01-27	SELL	Market Sell	차진규 Cha Jin-gyu	committee member	-10	₩23,800	+1.3%	₩238K ($165)
2026-01-08	BUY	주식매수청구권 행사	차진규 Cha Jin-gyu	committee member	13.0K	₩23,400	+0.4%	₩304M ($211K)

Showing the 50 most recent of 64 filings.

Frequently asked questions

Who has been buying Doinsis stock?: 2 distinct insiders have filed 0 disclosed insider purchases in Doinsis (484120), most recently on 2026-04-01. 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 Doinsis have?: Doinsis has 0 buy-side and 21 sell-side disclosures on record, covering ₩190M ($132K) in total reported value, spanning 2025-07-23 to 2026-04-01.
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.