Who has been buying Syntekabio stock?

4 distinct insiders have filed 19 disclosed insider purchases in Syntekabio (226330), most recently on 2026-06-30. 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 Syntekabio have?

Syntekabio has 19 buy-side and 4 sell-side disclosures on record, covering ₩1.3B ($888K) in total reported value, spanning 2024-02-21 to 2026-06-30.

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.

Syntekabio 226330

Company

신테카바이오Syntekabio

Insiders

Buys

Total Value

₩1.3B ($888K)

Avg Return

-7.62%

Last Filing

2026-06-30

Syntekabio (226330) has 19 disclosed insider purchases and 4 disclosed disposals on record, filed by 4 distinct insiders. Together those filings cover ₩1.3B ($888K) in reported transaction value. The earliest filing StockDrifts holds for Syntekabio is dated 2024-02-21; the most recent is 2026-06-30. Across these filings the average return since disclosure is -7.62%, 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
2026-07-29	BUY	Market Buy	정종철 Jeong Jong-cheol	moving	30.6K	₩1,384	+15.6%	₩55M ($38K)
2026-07-28	BUY	Market Buy	정종철 Jeong Jong-cheol	moving	7.2K	₩1,545	+3.6%	₩11M ($8K)
2026-07-22	BUY	Market Buy	정종선 Jong-seon Jeong	CEO	15.1K	₩1,369	+4.6%	₩21M ($15K)
2026-06-30	BUY	Market Buy	홍종희 Hong Jong-hee	moving	44.7K	₩1,566	+0.6%	₩70M ($49K)
2026-06-30	BUY	Market Buy	정종선 Jong-seon Jeong	CEO	30.0K	₩1,566	-8.1%	₩47M ($33K)
2026-06-29	BUY	Market Buy	정종선 Jong-seon Jeong	CEO	30.0K	₩1,609	-10.5%	₩48M ($34K)
2026-06-26	BUY	Market Buy	정종선 Jong-seon Jeong	CEO	30.0K	₩1,561	+0.9%	₩47M ($33K)
2026-06-25	BUY	Market Buy	정종선 Jong-seon Jeong	CEO	30.0K	₩1,597	-1.4%	₩48M ($33K)
2026-05-19	BUY	Market Buy	정종선 Jong-seon Jeong	CEO	10.0K	₩2,450	-2.0%	₩25M ($17K)
2026-05-18	BUY	Market Buy	정종선 Jong-seon Jeong	CEO	42.0K	₩2,320	+3.5%	₩97M ($68K)
2026-05-13	BUY	Market Buy	정종선 Jong-seon Jeong	CEO	38.0K	₩2,640	-9.1%	₩100M ($70K)
2026-04-01	BUY	신규선임	조영국 Cho Young-guk	president	30.7K	₩3,445	-8.6%	₩106M ($73K)
2026-01-26	BUY	Market Buy	정종선 Jong-seon Jeong	CEO	10.0K	₩3,665	-2.9%	₩37M ($25K)
2026-01-23	BUY	Market Buy	정종선 Jong-seon Jeong	CEO	15.0K	₩3,660	-2.7%	₩55M ($38K)
2026-01-21	BUY	Market Buy	정종선 Jong-seon Jeong	CEO	30.0K	₩3,415	+4.3%	₩102M ($71K)
2025-12-22	BUY	유상신주취득	정종선 Jong-seon Jeong	CEO	74	₩4,345	-18.1%	₩322K ($223)
2025-12-22	SELL	기타	홍종희 Hong Jong-hee	moving	-5.2K	₩4,345	+18.1%	₩23M ($16K)
2025-12-22	BUY	유상신주취득	홍종희 Hong Jong-hee	moving	6.3K	₩4,345	-18.1%	₩27M ($19K)
2025-12-22	SELL	기타	정종선 Jong-seon Jeong	CEO	-829.3K	₩4,345	+18.1%	₩3.6B ($2.5M)
2025-12-22	BUY	유상신주취득	정종선 Jong-seon Jeong	CEO	995.1K	₩4,345	-18.1%	₩4.3B ($3.0M)
2025-12-02	SELL	Market Sell	홍종희 Hong Jong-hee	moving	-10.0K	₩4,675	+23.9%	₩47M ($32K)
2025-12-02	SELL	Market Sell	정종철 Jeong Jong-cheol	moving	-39.3K	₩4,675	+23.9%	₩184M ($128K)
2025-12-01	SELL	Market Sell	홍종희 Hong Jong-hee	moving	-20.0K	₩4,700	+24.3%	₩94M ($65K)
2025-11-28	SELL	Market Sell	홍종희 Hong Jong-hee	moving	-11.7K	₩4,640	+23.3%	₩54M ($38K)
2025-11-25	SELL	장외매도	정종선 Jong-seon Jeong	CEO	-553.0K	₩4,640	+23.3%	₩2.6B ($1.8M)
2025-11-19	BUY	기타	홍종희 Hong Jong-hee	moving	46.9K	₩5,820	-38.8%	₩273M ($189K)
2025-11-19	BUY	기타	정종선 Jong-seon Jeong	CEO	1.4M	₩5,820	-38.8%	₩8.0B ($5.6M)
2025-11-19	BUY	기타	정종철 Jeong Jong-cheol	moving	39.3K	₩5,820	-38.8%	₩229M ($159K)
2024-10-24	BUY	Market Buy	정종선 Jong-seon Jeong	CEO	6.0K	₩3,870	-8.0%	₩23M ($16K)
2024-10-17	SELL	임원퇴임	조혜경 Jo Hye-kyung	president	-5.6K	₩5,054	+29.6%	₩28M ($20K)
2024-10-15	BUY	Market Buy	정종선 Jong-seon Jeong	CEO	4.0K	₩5,020	-29.1%	₩20M ($14K)
2024-09-09	BUY	Market Buy	정종선 Jong-seon Jeong	CEO	3.5K	₩4,861	-26.8%	₩17M ($12K)
2024-09-06	BUY	Market Buy	정종선 Jong-seon Jeong	CEO	7.0K	₩4,777	-25.5%	₩33M ($23K)
2024-08-08	BUY	Market Buy	조혜경 Jo Hye-kyung	president	1.5K	₩5,623	-36.7%	₩8M ($6K)
2024-08-07	BUY	Market Buy	정종선 Jong-seon Jeong	CEO	10.0K	₩5,330	-33.2%	₩53M ($37K)
2024-06-24	BUY	Market Buy	조혜경 Jo Hye-kyung	president	4.1K	₩6,125	-41.9%	₩25M ($17K)
2024-06-24	BUY	Market Buy	정종선 Jong-seon Jeong	CEO	7.1K	₩6,125	-41.9%	₩44M ($30K)
2024-02-21	BUY	주식매수청구권 행사	홍종희 Hong Jong-hee	moving	8.0K	₩11,020	-67.7%	₩88M ($61K)

Frequently asked questions

Who has been buying Syntekabio stock?: 4 distinct insiders have filed 19 disclosed insider purchases in Syntekabio (226330), most recently on 2026-06-30. 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 Syntekabio have?: Syntekabio has 19 buy-side and 4 sell-side disclosures on record, covering ₩1.3B ($888K) in total reported value, spanning 2024-02-21 to 2026-06-30.
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.