Who has been buying Aptamer Science stock?

5 distinct insiders have filed 9 disclosed insider purchases in Aptamer Science (291650), most recently on 2026-04-10. 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 Aptamer Science have?

Aptamer Science has 9 buy-side and 8 sell-side disclosures on record, covering ₩3.7B ($2.5M) in total reported value, spanning 2024-03-05 to 2026-04-10.

Where does StockDrifts get Aptamer Science 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.

Aptamer Science 291650

Company

압타머사이언스Aptamer Science

Insiders

Buys

Total Value

₩3.7B ($2.5M)

Avg Return

+0.36%

Last Filing

2026-04-10

Aptamer Science (291650) has 9 disclosed insider purchases and 8 disclosed disposals on record, filed by 5 distinct insiders. Together those filings cover ₩3.7B ($2.5M) in reported transaction value. The earliest filing StockDrifts holds for Aptamer Science is dated 2024-03-05; the most recent is 2026-04-10. 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 +0.36%, 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
2026-04-10	BUY	유상신주취득	Wellnew&Co.	-	12.0M	₩1,908	-13.9%	₩22.9B ($15.9M)
2025-11-28	BUY	Market Buy	알티캐스트 Alticast	-	46.3K	₩779	+56.2%	₩36M ($25K)
2025-11-18	BUY	Market Buy	알티캐스트 Alticast	-	8.0K	₩818	+48.8%	₩7M ($5K)
2025-10-27	SELL	임원퇴임	한동일 Han Dong-il	CEO	-1.4M	₩1,057	-15.1%	₩1.5B ($1.0M)
2025-10-27	BUY	제3자배정유상증자	대현기건 Daehyun Kigun	-	6.6M	₩1,057	+15.1%	₩7.0B ($4.8M)
2025-10-27	BUY	신규보고	알티캐스트 Alticast	-	7.1M	₩1,057	+15.1%	₩7.5B ($5.2M)
2025-10-27	SELL	임원퇴임	류성호 Seongho Ryu	CTO	-566.9K	₩1,057	-15.1%	₩599M ($416K)
2025-10-24	SELL	장외매도	한동일 Han Dong-il	CEO	-1.4M	₩1,036	-17.5%	₩1.5B ($1.0M)
2025-10-24	SELL	장외매도	류성호 Seongho Ryu	CTO	-500.0K	₩1,036	-17.5%	₩518M ($360K)
2024-12-13	BUY	유상신주취득	한동일 Han Dong-il	CEO	706.0K	₩1,555	-21.7%	₩1.1B ($762K)
2024-12-13	SELL	기타	한동일 Han Dong-il	CEO	-580.0K	₩1,555	+21.7%	₩902M ($626K)
2024-12-13	SELL	기타	류성호 Seongho Ryu	CTO	-210.3K	₩1,555	+21.7%	₩327M ($227K)
2024-12-13	SELL	기타	이광용 Gwangyong Lee	Managing Director	-5.5K	₩1,555	+21.7%	₩9M ($6K)
2024-12-13	SELL	기타	이철환 Cheolhwan Lee	Managing Director	-9.6K	₩1,555	+21.7%	₩15M ($10K)
2024-12-13	BUY	유상신주취득	이철환 Cheolhwan Lee	Managing Director	11.5K	₩1,555	-21.7%	₩18M ($12K)
2024-12-13	BUY	유상신주취득	이대견 Lee Dae-gyeon	Managing Director	15.3K	₩1,555	-21.7%	₩24M ($16K)
2024-12-13	SELL	기타	이대견 Lee Dae-gyeon	Managing Director	-15.3K	₩1,555	+21.7%	₩24M ($16K)
2024-12-13	BUY	유상신주취득	이광용 Gwangyong Lee	Managing Director	6.6K	₩1,555	-21.7%	₩10M ($7K)
2024-12-13	BUY	유상신주취득	류성호 Seongho Ryu	CTO	210.3K	₩1,555	-21.7%	₩327M ($227K)
2024-12-03	SELL	시간외매매	한동일 Han Dong-il	CEO	-500.0K	₩1,614	+24.6%	₩807M ($560K)
2024-12-03	SELL	Market Sell	류성호 Seongho Ryu	CTO	-13.4K	₩1,614	+24.6%	₩22M ($15K)
2024-11-28	SELL	시간외매매	한동일 Han Dong-il	CEO	-200.0K	₩1,860	+34.6%	₩372M ($258K)
2024-11-28	SELL	시간외매매	류성호 Seongho Ryu	CTO	-150.0K	₩1,860	+34.6%	₩279M ($194K)
2024-11-26	SELL	Market Sell	한동일 Han Dong-il	CEO	-73.0K	₩1,875	+35.1%	₩137M ($95K)
2024-11-25	SELL	Market Sell	한동일 Han Dong-il	CEO	-155.4K	₩1,950	+37.6%	₩303M ($211K)
2024-11-22	SELL	Market Sell	한동일 Han Dong-il	CEO	-279.4K	₩1,816	+33.0%	₩507M ($352K)
2024-11-21	SELL	Market Sell	한동일 Han Dong-il	CEO	-403.0K	₩1,889	+35.6%	₩761M ($529K)
2024-11-21	SELL	Market Sell	류성호 Seongho Ryu	CTO	-391.4K	₩1,889	+35.6%	₩739M ($513K)
2024-11-20	SELL	Market Sell	류성호 Seongho Ryu	CTO	-99.2K	₩1,985	+38.7%	₩197M ($137K)
2024-11-20	SELL	Market Sell	한동일 Han Dong-il	CEO	-440.0K	₩1,985	+38.7%	₩873M ($607K)
2024-11-11	BUY	기타	이광용 Gwangyong Lee	Managing Director	5.5K	₩1,919	-36.6%	₩11M ($7K)
2024-11-11	BUY	기타	이철환 Cheolhwan Lee	Managing Director	9.6K	₩1,919	-36.6%	₩18M ($13K)
2024-11-11	BUY	기타	한동일 Han Dong-il	CEO	1.9M	₩1,919	-36.6%	₩3.7B ($2.6M)
2024-11-11	BUY	기타	류성호 Seongho Ryu	CTO	700.9K	₩1,919	-36.6%	₩1.3B ($934K)
2024-11-11	BUY	기타	이대견 Lee Dae-gyeon	Managing Director	15.3K	₩1,919	-36.6%	₩29M ($20K)
2024-03-07	BUY	Market Buy	이광용 Gwangyong Lee	Managing Director	6.1K	₩2,633	-53.8%	₩16M ($11K)
2024-03-06	BUY	Market Buy	한동일 Han Dong-il	CEO	4.0K	₩2,642	-53.9%	₩11M ($7K)
2024-03-06	BUY	Market Buy	이광용 Gwangyong Lee	Managing Director	857	₩2,642	-53.9%	₩2M ($2K)
2024-03-06	BUY	Market Buy	이철환 Cheolhwan Lee	Managing Director	4.0K	₩2,642	-53.9%	₩11M ($7K)
2024-03-05	BUY	Market Buy	이철환 Cheolhwan Lee	Managing Director	4.0K	₩2,646	-54.0%	₩11M ($7K)
2024-03-05	BUY	Market Buy	한동일 Han Dong-il	CEO	6.0K	₩2,646	-54.0%	₩16M ($11K)
2024-03-05	BUY	Market Buy	이광용 Gwangyong Lee	Managing Director	1.0K	₩2,646	-54.0%	₩3M ($2K)

Frequently asked questions

Who has been buying Aptamer Science stock?: 5 distinct insiders have filed 9 disclosed insider purchases in Aptamer Science (291650), most recently on 2026-04-10. 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 Aptamer Science have?: Aptamer Science has 9 buy-side and 8 sell-side disclosures on record, covering ₩3.7B ($2.5M) in total reported value, spanning 2024-03-05 to 2026-04-10.
Where does StockDrifts get Aptamer Science 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 Aptamer Science. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.