Who has been buying IST stock?

0 distinct insiders have filed 0 disclosed insider purchases in IST (212710), most recently on 2026-06-11. 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 IST have?

IST has 0 buy-side and 0 sell-side disclosures on record, spanning 2025-02-12 to 2026-06-11.

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.

IST 212710

Company

아이에스티이IST

Insiders

Buys

Total Value

—

Avg Return

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Last Filing

2026-06-11

IST (212710) has 0 disclosed insider purchases and 0 disclosed disposals on record, filed by 0 distinct insiders. The earliest filing StockDrifts holds for IST is dated 2025-02-12; the most recent is 2026-06-11.

Price & insider activity (12 months)

Recent insider trades

Date	Type	Source	Insider	Position	Shares	Price at filing	Return	Value
2026-08-27	SELL	Market Sell	최두현 Doohyun Choi	moving	-47	₩7,940	+4.3%	₩387K ($269)
2026-08-27	SELL	Market Sell	허정수 Heo Jeong-su	Managing Director	-4.2K	₩7,940	+2.8%	₩34M ($23K)
2026-08-26	SELL	Market Sell	최두현 Doohyun Choi	moving	-3.0K	₩8,220	+7.5%	₩25M ($17K)
2026-08-24	SELL	Market Sell	허정수 Heo Jeong-su	Managing Director	-2.9K	₩7,930	+2.6%	₩23M ($16K)
2026-08-19	SELL	Market Sell	허정수 Heo Jeong-su	Managing Director	-988	-	-	-
2026-06-11	BUY	주식매수선택권	양정오 Yang noon	moving	4.0K	-	-	-
2026-06-10	BUY	주식매수선택권	서강석 Seo Kang-seok	Managing Director	16.0K	-	-	-
2026-06-10	BUY	주식매수선택권	노길수 Gilsu Noh	Managing Director	20.0K	-	-	-
2026-06-10	BUY	주식매수선택권	허정수 Heo Jeong-su	Managing Director	20.0K	-	-	-
2026-06-10	BUY	주식매수선택권	이영민 Youngmin Lee	Managing Director	28.0K	-	-	-
2026-01-09	BUY	PROGRAM	진병주 Jin Byeong-ju	vice president	20.0K	₩8,560	+3.3%	₩171M ($119K)
2026-01-09	BUY	PROGRAM	박성수 Seongsu Park	vice president	10.0K	₩8,560	+3.3%	₩86M ($59K)
2026-01-09	BUY	PROGRAM	양정오 Yang noon	moving	20.0K	₩8,560	+3.3%	₩171M ($119K)
2026-01-09	BUY	PROGRAM	최두현 Doohyun Choi	moving	26.0K	₩8,560	+3.3%	₩223M ($155K)
2026-01-09	BUY	PROGRAM	허정수 Heo Jeong-su	Managing Director	20.0K	₩8,560	+3.3%	₩171M ($119K)
2026-01-09	BUY	PROGRAM	김대정 Daejeong Kim	Managing Director	40.0K	₩8,560	+3.3%	₩342M ($238K)
2026-01-09	BUY	PROGRAM	김근호 Lee Do-hoon	Managing Director	3.0K	₩8,560	+3.3%	₩26M ($18K)
2026-01-09	BUY	PROGRAM	현종신 Hyeonjongshin	Managing Director	34.0K	₩8,560	+3.3%	₩291M ($202K)
2026-01-09	BUY	PROGRAM	노길수 Gilsu Noh	Managing Director	10.0K	₩8,560	+3.3%	₩86M ($59K)
2025-10-24	BUY	PROGRAM	노길수 Gilsu Noh	Managing Director	10.0K	₩10,510	-15.9%	₩105M ($73K)
2025-10-24	BUY	PROGRAM	윤석희 Seokhee Yoon	vice president	20.0K	₩10,510	-15.9%	₩210M ($146K)
2025-10-24	BUY	PROGRAM	서강석 Seo Kang-seok	Managing Director	10.0K	₩10,510	-15.9%	₩105M ($73K)
2025-10-24	BUY	PROGRAM	김근호 Lee Do-hoon	Managing Director	37.0K	₩10,510	-15.9%	₩389M ($270K)
2025-10-24	BUY	PROGRAM	박성수 Seongsu Park	vice president	20.0K	₩10,510	-15.9%	₩210M ($146K)
2025-10-24	BUY	PROGRAM	진병주 Jin Byeong-ju	vice president	20.0K	₩10,510	-15.9%	₩210M ($146K)
2025-06-05	BUY	주식매수청구권 행사	심현보 Hyunbo Shim	vice president	24.0K	₩9,800	-9.8%	₩235M ($163K)
2025-02-12	BUY	PROGRAM	심현보 Hyunbo Shim	vice president	16.0K	₩22,500	-60.7%	₩360M ($250K)
2025-02-12	BUY	PROGRAM	김주일 Kim Joo-il	Managing Director	20.0K	₩22,500	-60.7%	₩450M ($313K)
2025-02-12	BUY	PROGRAM	허정수 Heo Jeong-su	Managing Director	28.0K	₩22,500	-60.7%	₩630M ($438K)
2025-02-12	BUY	PROGRAM	노길수 Gilsu Noh	Managing Director	60.0K	₩22,500	-60.7%	₩1.4B ($938K)
2025-02-12	BUY	PROGRAM	조창현 Cho Changhyun	CEO	4.0M	₩22,500	-60.7%	₩90.0B ($62.5M)
2025-02-12	BUY	PROGRAM	양정오 Yang noon	moving	16.0K	₩22,500	-60.7%	₩360M ($250K)

Frequently asked questions

Who has been buying IST stock?: 0 distinct insiders have filed 0 disclosed insider purchases in IST (212710), most recently on 2026-06-11. 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 IST have?: IST has 0 buy-side and 0 sell-side disclosures on record, spanning 2025-02-12 to 2026-06-11.
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.