Who has been buying Jinseong TEC stock?

2 distinct insiders have filed 15 disclosed insider purchases in Jinseong TEC (036890), most recently on 2026-06-29. 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 Jinseong TEC have?

Jinseong TEC has 15 buy-side and 4 sell-side disclosures on record, covering ₩825M ($573K) in total reported value, spanning 2024-08-06 to 2026-06-29.

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.

Jinseong TEC 036890

Company

진성티이씨Jinseong TEC

Insiders

Buys

Total Value

₩825M ($573K)

Avg Return

+90.62%

Last Filing

2026-06-29

Jinseong TEC (036890) has 15 disclosed insider purchases and 4 disclosed disposals on record, filed by 2 distinct insiders. Together those filings cover ₩825M ($573K) in reported transaction value. The earliest filing StockDrifts holds for Jinseong TEC is dated 2024-08-06; the most recent is 2026-06-29. Across these filings the average return since disclosure is +90.62%, 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
2026-08-25	SELL	Market Sell	국민연금공단 National Pension Service	-	-23.4K	₩12,570	-5.6%	₩277M ($193K)
2026-08-24	SELL	Market Sell	국민연금공단 National Pension Service	-	-24.0K	₩12,240	-8.4%	₩295M ($205K)
2026-08-21	SELL	Market Sell	국민연금공단 National Pension Service	-	-10.0K	₩12,240	-8.4%	₩125M ($87K)
2026-08-21	BUY	Market Buy	국민연금공단 National Pension Service	-	1.2K	₩12,240	+8.4%	₩15M ($10K)
2026-08-20	SELL	Market Sell	국민연금공단 National Pension Service	-	-6.0K	₩12,240	-8.4%	₩77M ($53K)
2026-08-20	BUY	Market Buy	국민연금공단 National Pension Service	-	1.6K	₩12,240	+8.4%	₩20M ($14K)
2026-08-19	SELL	Market Sell	국민연금공단 National Pension Service	-	-12.0K	-	-	-
2026-08-18	SELL	Market Sell	국민연금공단 National Pension Service	-	-10.0K	-	-	-
2026-08-14	BUY	Market Buy	국민연금공단 National Pension Service	-	2.0K	-	-	-
2026-08-12	SELL	Market Sell	국민연금공단 National Pension Service	-	-7.0K	-	-	-
2026-08-11	BUY	Market Buy	국민연금공단 National Pension Service	-	2.3K	-	-	-
2026-08-11	SELL	Market Sell	국민연금공단 National Pension Service	-	-6.0K	-	-	-
2026-08-10	BUY	Market Buy	국민연금공단 National Pension Service	-	2.4K	-	-	-
2026-08-10	SELL	Market Sell	국민연금공단 National Pension Service	-	-11.3K	-	-	-
2026-07-01	BUY	Market Buy	국민연금공단 National Pension Service	-	34.4K	-	-	-
2026-06-29	SELL	Market Sell	국민연금공단 National Pension Service	-	-8.9K	-	-	-
2026-06-25	BUY	Market Buy	국민연금공단 National Pension Service	-	4.1K	-	-	-
2026-06-25	SELL	Market Sell	국민연금공단 National Pension Service	-	-70	-	-	-
2026-06-23	SELL	Market Sell	국민연금공단 National Pension Service	-	-6.6K	-	-	-
2026-06-22	BUY	Market Buy	국민연금공단 National Pension Service	-	19.8K	-	-	-
2026-06-19	BUY	Market Buy	국민연금공단 National Pension Service	-	29.3K	-	-	-
2026-06-19	SELL	Market Sell	국민연금공단 National Pension Service	-	-51	-	-	-
2026-06-18	BUY	신규보고	국민연금공단 National Pension Service	-	2.2M	-	-	-
2026-06-18	BUY	신규주요주주	국민연금공단 National Pension Service	-	32.8K	-	-	-
2024-09-09	BUY	Market Buy	윤우석 Yoon Woo-seok	Chairman	3.0K	₩7,960	+96.0%	₩24M ($17K)
2024-09-06	BUY	Market Buy	윤우석 Yoon Woo-seok	Chairman	11.0K	₩7,910	+97.2%	₩87M ($60K)
2024-09-05	BUY	Market Buy	윤우석 Yoon Woo-seok	Chairman	12.0K	₩7,980	+95.5%	₩96M ($67K)
2024-09-04	BUY	Market Buy	윤우석 Yoon Woo-seok	Chairman	15.0K	₩8,010	+94.8%	₩120M ($83K)
2024-09-02	BUY	Market Buy	윤우석 Yoon Woo-seok	Chairman	3.0K	₩8,180	+90.7%	₩25M ($17K)
2024-08-29	BUY	Market Buy	윤우석 Yoon Woo-seok	Chairman	3.5K	₩8,260	+88.9%	₩29M ($20K)
2024-08-28	BUY	Market Buy	윤우석 Yoon Woo-seok	Chairman	1.0K	₩8,360	+86.6%	₩8M ($6K)
2024-08-27	BUY	Market Buy	윤우석 Yoon Woo-seok	Chairman	6.9K	₩8,380	+86.2%	₩58M ($40K)
2024-08-26	BUY	Market Buy	윤우석 Yoon Woo-seok	Chairman	1.0K	₩8,290	+88.2%	₩8M ($6K)
2024-08-08	BUY	Market Buy	윤우석 Yoon Woo-seok	Chairman	13.7K	₩8,340	+87.0%	₩115M ($80K)
2024-08-07	BUY	Market Buy	윤우석 Yoon Woo-seok	Chairman	14.0K	₩8,410	+85.5%	₩118M ($82K)
2024-08-06	BUY	Market Buy	윤우석 Yoon Woo-seok	Chairman	16.9K	₩8,170	+90.9%	₩138M ($96K)

Frequently asked questions

Who has been buying Jinseong TEC stock?: 2 distinct insiders have filed 15 disclosed insider purchases in Jinseong TEC (036890), most recently on 2026-06-29. 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 Jinseong TEC have?: Jinseong TEC has 15 buy-side and 4 sell-side disclosures on record, covering ₩825M ($573K) in total reported value, spanning 2024-08-06 to 2026-06-29.
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.