Who has been buying MD Device stock?

4 distinct insiders have filed 0 disclosed insider purchases in MD Device (226590), most recently on 2026-05-26. 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 MD Device have?

MD Device has 0 buy-side and 7 sell-side disclosures on record, covering ₩775M ($538K) in total reported value, spanning 2025-03-07 to 2026-05-26.

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.

MD Device 226590

Company

엠디바이스MD Device

Insiders

Buys

Total Value

₩775M ($538K)

Avg Return

-67.47%

Last Filing

2026-05-26

MD Device (226590) has 0 disclosed insider purchases and 7 disclosed disposals on record, filed by 4 distinct insiders. Together those filings cover ₩775M ($538K) in reported transaction value. The earliest filing StockDrifts holds for MD Device is dated 2025-03-07; the most recent is 2026-05-26. Across these filings the average return since disclosure is -67.47%, 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
2026-05-26	SELL	Market Sell	주우식 Joo Woo-sik	Other non-executive directors	-215	₩21,650	+14.2%	₩5M ($3K)
2026-04-17	BUY	주식매수청구권 행사	최종민 Choi Jong-min	CFO	60.0K	₩28,550	-3.1%	₩1.7B ($1.2M)
2026-04-17	BUY	주식매수청구권 행사	주영대 Youngdae Joo	CTO	6.0K	₩28,550	-3.1%	₩171M ($119K)
2026-04-17	BUY	주식매수청구권 행사	주우식 Joo Woo-sik	Other non-executive directors	20.0K	₩28,550	-3.1%	₩571M ($397K)
2026-03-18	SELL	Market Sell	주영대 Youngdae Joo	CTO	-6.0K	-	-	-
2025-09-30	SELL	Market Sell	위세욱 Wi Se-wook	thanks	-3.0K	₩22,100	-24.0%	₩66M ($46K)
2025-09-26	SELL	Market Sell	위세욱 Wi Se-wook	thanks	-2.0K	₩21,900	-25.1%	₩44M ($30K)
2025-09-12	SELL	Market Sell	위세욱 Wi Se-wook	thanks	-9.0K	₩15,490	-76.9%	₩139M ($97K)
2025-09-10	SELL	Market Sell	옐로씨펀드 Yellow Sea Fund	Other non-executive directors	-40.0K	₩11,390	-140.6%	₩456M ($316K)
2025-09-08	SELL	Market Sell	위세욱 Wi Se-wook	thanks	-6.0K	₩10,850	-152.5%	₩65M ($45K)
2025-03-07	BUY	신규상장	주영대 Youngdae Joo	CTO	10.0K	₩11,100	+146.8%	₩111M ($77K)
2025-03-07	BUY	신규상장	위세욱 Wi Se-wook	thanks	20.0K	₩11,100	+146.8%	₩222M ($154K)
2025-03-07	BUY	신규상장	옐로씨펀드 Yellow Sea Fund	Other non-executive directors	40.0K	₩11,100	+146.8%	₩444M ($308K)
2025-03-07	BUY	신규상장	조호경 Jo Ho-kyung	CEO	3.2M	₩11,100	+146.8%	₩35.7B ($24.8M)

Frequently asked questions

Who has been buying MD Device stock?: 4 distinct insiders have filed 0 disclosed insider purchases in MD Device (226590), most recently on 2026-05-26. 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 MD Device have?: MD Device has 0 buy-side and 7 sell-side disclosures on record, covering ₩775M ($538K) in total reported value, spanning 2025-03-07 to 2026-05-26.
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.