Who has been buying GST stock?

16 distinct insiders have filed 16 disclosed insider purchases in GST (083450), most recently on 2026-06-02. 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 GST have?

GST has 16 buy-side and 31 sell-side disclosures on record, covering ₩7.8B ($5.4M) in total reported value, spanning 2020-01-03 to 2026-06-02.

Where does StockDrifts get GST 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.

GST 083450

Company

GST

Insiders

Buys

Total Value

₩7.8B ($5.4M)

Avg Return

+24.55%

Last Filing

2026-06-02

GST (083450) has 16 disclosed insider purchases and 31 disclosed disposals on record, filed by 16 distinct insiders. Together those filings cover ₩7.8B ($5.4M) in reported transaction value. The earliest filing StockDrifts holds for GST is dated 2020-01-03; the most recent is 2026-06-02. 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 +24.55%, 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
2026-07-22	BUY	Market Buy	석종욱 Seok Jong-wook	CEO	100	₩42,350	-5.2%	₩4M ($3K)
2026-07-20	BUY	Market Buy	석종욱 Seok Jong-wook	CEO	100	₩43,200	-7.1%	₩4M ($3K)
2026-07-15	BUY	Market Buy	석종욱 Seok Jong-wook	CEO	800	₩48,350	-11.4%	₩36M ($25K)
2026-06-02	BUY	Market Buy	석종욱 Seok Jong-wook	CEO	400	₩48,200	+7.3%	₩19M ($13K)
2026-05-21	BUY	Market Buy	석종욱 Seok Jong-wook	CEO	600	₩57,500	-10.1%	₩35M ($24K)
2026-05-19	BUY	Market Buy	이순창 Soonchang Lee	Outside Director	330	-	-	-
2026-04-01	BUY	Market Buy	문승보 Seungbo Moon	CEO	640	₩27,250	+56.5%	₩17M ($12K)
2026-03-27	BUY	주식매수청구권 행사	박재석 Jaeseok Park	Managing Director	3.0K	₩27,050	+57.7%	₩81M ($56K)
2026-03-25	BUY	Market Buy	석종욱 Seok Jong-wook	CEO	2.0K	₩29,700	+43.6%	₩59M ($41K)
2026-02-27	SELL	증여	김덕준 Deokjun Kim	Chairman	-20.0K	₩31,750	+14.8%	₩635M ($441K)
2026-02-27	BUY	계약중도해지	석종욱 Seok Jong-wook	CEO	7.5K	₩31,750	-14.8%	₩239M ($166K)
2026-01-06	SELL	대여	석종욱 Seok Jong-wook	CEO	-91	₩32,050	+15.6%	₩3M ($2K)
2026-01-01	BUY	신규보고	유병선 Yoo Byung-seon	moving	104	₩30,400	-11.0%	₩3M ($2K)
2025-12-29	BUY	기타	석종욱 Seok Jong-wook	CEO	560	₩27,050	+0.0%	₩15M ($11K)
2025-12-24	BUY	주식매수청구권 행사	박재석 Jaeseok Park	Managing Director	3.0K	₩27,050	+0.0%	₩81M ($56K)
2025-12-23	SELL	대여	석종욱 Seok Jong-wook	CEO	-6.7K	₩29,300	+7.7%	₩197M ($137K)
2025-12-09	SELL	Market Sell	김주영 Jooyoung Kim	moving	-219	₩25,500	-6.1%	₩6M ($4K)
2025-12-08	SELL	Market Sell	김주영 Jooyoung Kim	moving	-80	₩25,700	-5.3%	₩2M ($1K)
2025-12-06	SELL	Market Sell	김주영 Jooyoung Kim	moving	-400	₩25,700	-5.3%	₩10M ($7K)
2025-12-05	SELL	Market Sell	김주영 Jooyoung Kim	moving	-1.2K	₩25,850	-4.6%	₩31M ($22K)
2025-12-03	SELL	Market Sell	김주영 Jooyoung Kim	moving	-800	₩26,400	-2.5%	₩21M ($15K)
2025-12-02	SELL	Market Sell	김주영 Jooyoung Kim	moving	-1.0K	₩25,850	-4.6%	₩26M ($18K)
2025-11-26	BUY	주식매수청구권 행사	김주영 Jooyoung Kim	moving	8.0K	₩25,350	+6.7%	₩203M ($141K)
2025-11-25	BUY	Market Buy	석종욱 Seok Jong-wook	CEO	2.0K	₩25,150	+7.5%	₩50M ($35K)
2025-11-25	BUY	Market Buy	석종욱 Seok Jong-wook	CEO	2.0K	₩25,150	+7.5%	₩50M ($35K)
2025-11-07	SELL	대여	석종욱 Seok Jong-wook	CEO	-560	₩26,700	-1.3%	₩15M ($10K)
2025-11-07	BUY	기타	석종욱 Seok Jong-wook	CEO	7	₩26,700	+1.3%	₩187K ($130)
2025-11-06	SELL	대여	석종욱 Seok Jong-wook	CEO	-506	₩27,950	+3.2%	₩14M ($10K)
2025-11-05	SELL	Market Sell	장순기 Soonki Jang	Managing Director	-4.0K	₩26,600	-1.7%	₩106M ($74K)
2025-10-29	SELL	대여	석종욱 Seok Jong-wook	CEO	-200	₩25,550	-5.9%	₩5M ($4K)
2025-10-24	SELL	대여	석종욱 Seok Jong-wook	CEO	-18	₩25,150	-7.5%	₩453K ($314)
2025-10-24	BUY	Market Buy	석종욱 Seok Jong-wook	CEO	1.0K	₩25,150	+7.5%	₩25M ($17K)
2025-10-22	BUY	Market Buy	석종욱 Seok Jong-wook	CEO	2.0K	₩24,250	+11.6%	₩49M ($34K)
2025-10-15	SELL	Market Sell	장순기 Soonki Jang	Managing Director	-4.0K	₩26,000	-4.0%	₩104M ($72K)
2025-10-02	BUY	Market Buy	문승보 Seungbo Moon	CEO	860	₩24,550	+10.2%	₩21M ($15K)
2025-09-11	SELL	Market Sell	석종욱 Seok Jong-wook	CEO	-1.7K	₩21,450	-26.1%	₩37M ($26K)
2025-08-22	BUY	Market Buy	석종욱 Seok Jong-wook	CEO	3.7K	₩18,320	+47.6%	₩68M ($48K)
2025-08-21	BUY	Market Buy	석종욱 Seok Jong-wook	CEO	1.0K	₩18,240	+48.3%	₩18M ($13K)
2025-02-26	SELL	Market Sell	이정우 Jeongwoo Lee	president	-20.0K	₩21,250	-27.3%	₩425M ($295K)
2025-02-21	SELL	Market Sell	이정우 Jeongwoo Lee	president	-25.0K	₩20,850	-29.7%	₩521M ($362K)
2025-01-01	BUY	신규선임	박상규 Park Sang-gyu	moving	4.0K	₩16,640	+62.6%	₩67M ($46K)
2024-11-29	BUY	Market Buy	용석균 Yong Seok-gyun	Outside Director	2.3K	₩14,000	+93.2%	₩32M ($22K)
2024-11-01	BUY	신규선임	강민수 Minsu Kang	Managing Director	2.9K	₩15,310	+76.7%	₩44M ($30K)
2024-06-27	BUY	PROGRAM	김응호 Kim Eung-ho	vice president	4.0K	₩21,200	+27.6%	₩85M ($59K)
2024-06-27	BUY	PROGRAM	김주영 Jooyoung Kim	moving	840	₩21,200	+27.6%	₩18M ($12K)
2024-06-27	BUY	PROGRAM	권준식 Junsik Kwon	Managing Director	900	₩21,200	+27.6%	₩19M ($13K)
2024-06-27	BUY	PROGRAM	김형관 Hyungkwan Kim	vice president	7.0K	₩21,200	+27.6%	₩148M ($103K)
2024-06-27	BUY	PROGRAM	나관출 Na Gwan-chul	vice president	20.0K	₩21,200	+27.6%	₩424M ($294K)
2024-06-27	BUY	PROGRAM	최윤경 Choi Yun-kyung	Managing Director	2.1K	₩21,200	+27.6%	₩45M ($31K)
2024-06-27	BUY	PROGRAM	최현석 Hyunseok Choi	moving	338	₩21,200	+27.6%	₩7M ($5K)

Showing the 50 most recent of 93 filings.

Frequently asked questions

Who has been buying GST stock?: 16 distinct insiders have filed 16 disclosed insider purchases in GST (083450), most recently on 2026-06-02. 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 GST have?: GST has 16 buy-side and 31 sell-side disclosures on record, covering ₩7.8B ($5.4M) in total reported value, spanning 2020-01-03 to 2026-06-02.
Where does StockDrifts get GST 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 GST. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.