Who has been buying biodyne stock?

3 distinct insiders have filed 18 disclosed insider purchases in biodyne (314930), most recently on 2026-07-10. 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 biodyne have?

biodyne has 18 buy-side and 1 sell-side disclosures on record, covering ₩3.9B ($2.7M) in total reported value, spanning 2024-02-28 to 2026-07-10.

Where does StockDrifts get biodyne 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.

biodyne 314930

Company

바이오다인biodyne

Insiders

Buys

Total Value

₩3.9B ($2.7M)

Avg Return

+0.23%

Last Filing

2026-07-10

biodyne (314930) has 18 disclosed insider purchases and 1 disclosed disposals on record, filed by 3 distinct insiders. Together those filings cover ₩3.9B ($2.7M) in reported transaction value. The earliest filing StockDrifts holds for biodyne is dated 2024-02-28; the most recent is 2026-07-10. 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 +0.23%, 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
2026-07-10	BUY	Market Buy	양근호 Yang Geun-ho	Internal director	2.0K	₩8,580	-2.6%	₩17M ($12K)
2026-07-09	BUY	Market Buy	양근호 Yang Geun-ho	Internal director	1.0K	₩8,580	-2.6%	₩9M ($6K)
2026-07-03	BUY	Market Buy	임욱빈 Wookbin Lim	CEO	19.6K	₩9,480	-9.5%	₩186M ($129K)
2026-06-04	BUY	Market Buy	임욱빈 Wookbin Lim	CEO	10.0K	₩10,020	-2.6%	₩101M ($70K)
2026-06-02	BUY	Market Buy	임욱빈 Wookbin Lim	CEO	13.0K	₩9,710	+0.5%	₩126M ($88K)
2026-06-01	BUY	Market Buy	임욱빈 Wookbin Lim	CEO	14.8K	₩9,710	+0.5%	₩143M ($100K)
2026-05-29	BUY	Market Buy	임욱빈 Wookbin Lim	CEO	11.8K	₩10,000	-2.4%	₩118M ($82K)
2026-05-28	BUY	Market Buy	임욱빈 Wookbin Lim	CEO	13.0K	₩10,480	-6.9%	₩136M ($95K)
2026-05-27	BUY	Market Buy	임욱빈 Wookbin Lim	CEO	14.9K	₩10,320	-5.4%	₩154M ($107K)
2025-11-26	BUY	Market Buy	양근호 Yang Geun-ho	Internal director	1.4K	₩13,290	+5.7%	₩19M ($13K)
2025-11-24	BUY	Market Buy	양근호 Yang Geun-ho	Internal director	650	₩13,350	+5.2%	₩9M ($6K)
2025-11-22	BUY	Market Buy	양근호 Yang Geun-ho	Internal director	177	₩13,350	+5.2%	₩2M ($2K)
2025-11-21	BUY	Market Buy	양근호 Yang Geun-ho	Internal director	923	₩13,810	+1.7%	₩13M ($9K)
2025-11-20	BUY	Market Buy	양근호 Yang Geun-ho	Internal director	2.6K	₩13,770	+2.0%	₩36M ($25K)
2025-11-20	BUY	Market Buy	고유라 Go Yoo-ra	Internal director	1.0K	₩13,770	+2.0%	₩14M ($10K)
2025-08-08	SELL	시간외매매	임욱빈 Wookbin Lim	CEO	-1.2M	₩15,880	+11.5%	₩18.4B ($12.8M)
2024-09-10	BUY	Market Buy	고유라 Go Yoo-ra	Internal director	660	₩13,330	+5.4%	₩9M ($6K)
2024-09-09	BUY	Market Buy	고유라 Go Yoo-ra	Internal director	340	₩13,490	+4.2%	₩5M ($3K)
2024-09-09	BUY	Market Buy	양근호 Yang Geun-ho	Internal director	1.0K	₩13,490	+4.2%	₩13M ($9K)
2024-03-26	BUY	신규보고	고유라 Go Yoo-ra	Internal director	1.9K	₩9,310	+50.9%	₩17M ($12K)
2024-03-26	BUY	신규보고	양근호 Yang Geun-ho	Internal director	8.2K	₩9,310	+50.9%	₩76M ($53K)
2024-02-29	BUY	무상신주취득	조우석 Jo Woo-seok	CL	168.8K	₩11,890	+18.2%	₩2.0B ($1.4M)
2024-02-29	BUY	무상신주취득	임욱빈 Wookbin Lim	CEO	10.7M	₩11,890	+18.2%	₩127.3B ($88.4M)
2024-02-28	SELL	Market Sell	임욱빈 Wookbin Lim	CEO	-200.3K	₩13,980	-0.5%	₩2.8B ($1.9M)

Frequently asked questions

Who has been buying biodyne stock?: 3 distinct insiders have filed 18 disclosed insider purchases in biodyne (314930), most recently on 2026-07-10. 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 biodyne have?: biodyne has 18 buy-side and 1 sell-side disclosures on record, covering ₩3.9B ($2.7M) in total reported value, spanning 2024-02-28 to 2026-07-10.
Where does StockDrifts get biodyne 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 biodyne. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.