Who has been buying SD biosensor stock?

14 distinct insiders have filed 36 disclosed insider purchases in SD biosensor (137310), most recently on 2026-03-25. 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 SD biosensor have?

SD biosensor has 36 buy-side and 0 sell-side disclosures on record, covering ₩51M ($35K) in total reported value, spanning 2024-06-24 to 2026-03-25.

Where does StockDrifts get SD biosensor 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.

SD biosensor 137310

Company

에스디바이오센서SD biosensor

Insiders

Buys

Total Value

₩51M ($35K)

Avg Return

-6.83%

Last Filing

2026-03-25

SD biosensor (137310) has 36 disclosed insider purchases and 0 disclosed disposals on record, filed by 14 distinct insiders. Together those filings cover ₩51M ($35K) in reported transaction value. The earliest filing StockDrifts holds for SD biosensor is dated 2024-06-24; the most recent is 2026-03-25. 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 -6.83%, 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
2026-08-10	SELL	증여	박성진 Seongjin Park	Managing Director	-17.0K	₩6,630	+1.2%	₩113M ($78K)
2026-03-25	BUY	PROGRAM	김주한 Joohan Kim	Managing Director	953	-	-	-
2026-03-24	BUY	PROGRAM	김주한 Joohan Kim	Managing Director	2.7K	-	-	-
2026-03-23	BUY	PROGRAM	김주한 Joohan Kim	Managing Director	1.5K	-	-	-
2026-03-23	BUY	PROGRAM	제현수 Hyeonsoo Je	moving	6.2K	-	-	-
2026-03-23	BUY	PROGRAM	민의기 Min Ui-gi	moving	6.2K	-	-	-
2026-03-23	BUY	PROGRAM	고종관 Gojonggwan	moving	6.2K	-	-	-
2026-03-23	BUY	PROGRAM	김병수 Kim Byeong-su	moving	3.4K	-	-	-
2026-03-23	BUY	PROGRAM	백재욱 Jaewook Baek	moving	6.2K	-	-	-
2026-03-23	BUY	PROGRAM	김근영 Kim Geun-young	moving	6.2K	-	-	-
2026-03-23	BUY	PROGRAM	김석규 Kim Seok-gyu	Managing Director	3.5K	-	-	-
2026-03-23	BUY	PROGRAM	주원석 Joo Won-seok	Managing Director	8.6K	-	-	-
2026-03-23	BUY	PROGRAM	유호경 Yoo Ho-kyung	Managing Director	10.0K	-	-	-
2026-03-23	BUY	PROGRAM	이은혜 Eunhye Lee	moving	1.3K	-	-	-
2026-03-20	BUY	PROGRAM	김병수 Kim Byeong-su	moving	3.0K	-	-	-
2026-03-20	BUY	PROGRAM	이은혜 Eunhye Lee	moving	5.0K	-	-	-
2026-03-20	BUY	PROGRAM	주원석 Joo Won-seok	Managing Director	1.4K	-	-	-
2026-03-20	BUY	PROGRAM	김주한 Joohan Kim	Managing Director	5.0K	-	-	-
2026-03-20	BUY	PROGRAM	박오준 Park Oh-jun	moving	6.2K	-	-	-
2026-03-17	BUY	Market Buy	조영식 Cho Young-sik	Chairman	67.2K	-	-	-
2026-03-16	BUY	Market Buy	조영식 Cho Young-sik	Chairman	5.1K	-	-	-
2026-03-13	BUY	Market Buy	조영식 Cho Young-sik	Chairman	28.7K	-	-	-
2026-03-12	BUY	Market Buy	조영식 Cho Young-sik	Chairman	108.2K	-	-	-
2026-03-11	BUY	Market Buy	조영식 Cho Young-sik	Chairman	90.4K	-	-	-
2026-03-09	BUY	Market Buy	이효근 Lee Hyo-geun	vice president	20.0K	-	-	-
2025-09-01	BUY	Market Buy	김석규 Kim Seok-gyu	Managing Director	548	₩9,900	-6.3%	₩5M ($4K)
2025-09-01	BUY	Market Buy	김석규 Kim Seok-gyu	Managing Director	495	₩9,900	-6.3%	₩5M ($3K)
2025-09-01	BUY	Market Buy	김석규 Kim Seok-gyu	Managing Director	849	₩9,900	-6.3%	₩8M ($6K)
2025-09-01	BUY	Market Buy	김석규 Kim Seok-gyu	Managing Director	1.5K	₩9,900	-6.3%	₩15M ($10K)
2025-09-01	BUY	Market Buy	김석규 Kim Seok-gyu	Managing Director	121	₩9,900	-6.3%	₩1M ($832)
2025-08-29	BUY	Market Buy	김석규 Kim Seok-gyu	Managing Director	1.0K	₩10,020	-7.4%	₩11M ($7K)
2025-08-29	BUY	Market Buy	김석규 Kim Seok-gyu	Managing Director	355	₩10,020	-7.4%	₩4M ($2K)
2025-08-29	BUY	Market Buy	김석규 Kim Seok-gyu	Managing Director	10	₩10,020	-7.4%	₩100K ($70)
2025-08-29	BUY	Market Buy	김석규 Kim Seok-gyu	Managing Director	123	₩10,020	-7.4%	₩1M ($856)
2025-08-29	BUY	Market Buy	김석규 Kim Seok-gyu	Managing Director	92	₩10,020	-7.4%	₩922K ($640)
2024-07-09	BUY	PROGRAM	김근영 Kim Geun-young	moving	56	-	-	-
2024-06-24	BUY	PROGRAM	김근영 Kim Geun-young	moving	153	-	-	-

Frequently asked questions

Who has been buying SD biosensor stock?: 14 distinct insiders have filed 36 disclosed insider purchases in SD biosensor (137310), most recently on 2026-03-25. 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 SD biosensor have?: SD biosensor has 36 buy-side and 0 sell-side disclosures on record, covering ₩51M ($35K) in total reported value, spanning 2024-06-24 to 2026-03-25.
Where does StockDrifts get SD biosensor 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 SD biosensor. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.