Who has been buying Seongil Hitech stock?

7 distinct insiders have filed 4 disclosed insider purchases in Seongil Hitech (365340), most recently on 2026-05-09. 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 Seongil Hitech have?

Seongil Hitech has 4 buy-side and 15 sell-side disclosures on record, covering ₩1.4B ($958K) in total reported value, spanning 2024-02-23 to 2026-05-09.

Where does StockDrifts get Seongil Hitech 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.

Seongil Hitech 365340

Company

성일하이텍Seongil Hitech

Insiders

Buys

Total Value

₩1.4B ($958K)

Avg Return

-25.69%

Last Filing

2026-05-09

Seongil Hitech (365340) has 4 disclosed insider purchases and 15 disclosed disposals on record, filed by 7 distinct insiders. Together those filings cover ₩1.4B ($958K) in reported transaction value. The earliest filing StockDrifts holds for Seongil Hitech is dated 2024-02-23; the most recent is 2026-05-09. 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 -25.69%, 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
2026-05-09	BUY	기타	이강명 Lee Kang-myeong	CEO	364	₩72,700	-6.6%	₩26M ($18K)
2026-05-09	BUY	기타	이경열 Lee Kyung-yeol	Registered director	243	₩72,700	-6.6%	₩18M ($12K)
2026-05-08	SELL	장외매도	이강명 Lee Kang-myeong	CEO	-38.5K	₩77,000	+11.8%	₩3.0B ($2.1M)
2026-05-08	SELL	장외매도	이경열 Lee Kyung-yeol	Registered director	-26.4K	₩77,000	+11.8%	₩2.0B ($1.4M)
2026-03-03	BUY	주식매수청구권 행사	손현태 Hyuntae Son	Managing Director	1.0K	-	-	-
2026-02-25	BUY	주식매수청구권 행사	김성식 Seongsik Kim	Managing Director	9.0K	-	-	-
2026-02-06	BUY	Market Buy	이재경 Jaekyung Lee	president	100	₩60,300	+6.1%	₩6M ($4K)
2026-02-04	SELL	Market Sell	염광현 Gwanghyeon Yeom	Managing Director	-400	₩65,500	+2.3%	₩26M ($18K)
2026-01-29	SELL	Market Sell	김성식 Seongsik Kim	Managing Director	-4.8K	₩72,400	+11.6%	₩348M ($241K)
2025-11-28	BUY	주식매수청구권 행사	김성식 Seongsik Kim	Managing Director	4.1K	₩41,750	+53.3%	₩171M ($119K)
2025-11-28	BUY	주식매수청구권 행사	손현태 Hyuntae Son	Managing Director	5.0K	₩41,750	+53.3%	₩209M ($145K)
2025-11-12	SELL	Market Sell	손현태 Hyuntae Son	Managing Director	-2.3K	₩41,400	-54.6%	₩95M ($66K)
2025-11-12	SELL	Market Sell	김성식 Seongsik Kim	Managing Director	-1.9K	₩41,400	-54.6%	₩79M ($55K)
2025-10-27	BUY	CB인수	이경열 Lee Kyung-yeol	Registered director	48.4K	₩46,600	+37.3%	₩2.3B ($1.6M)
2025-10-27	BUY	CB인수	이강명 Lee Kang-myeong	CEO	72.6K	₩46,600	+37.3%	₩3.4B ($2.3M)
2025-09-11	BUY	주식매수선택권	손현태 Hyuntae Son	Managing Director	4.0K	₩36,850	+73.7%	₩147M ($102K)
2025-09-08	BUY	주식매수선택권	김성식 Seongsik Kim	Managing Director	3.4K	₩36,850	+73.7%	₩125M ($87K)
2025-09-08	BUY	주식매수선택권	염광현 Gwanghyeon Yeom	Managing Director	1.0K	₩36,850	+73.7%	₩37M ($26K)
2025-08-14	SELL	Market Sell	김성식 Seongsik Kim	Managing Director	-2.5K	₩40,350	-58.6%	₩101M ($70K)
2025-08-14	SELL	Market Sell	염광현 Gwanghyeon Yeom	Managing Director	-2.0K	₩40,350	-58.6%	₩81M ($56K)
2025-07-29	SELL	Market Sell	손현태 Hyuntae Son	Managing Director	-2.0K	₩38,050	-68.2%	₩76M ($53K)
2025-07-24	SELL	Market Sell	염광현 Gwanghyeon Yeom	Managing Director	-700	₩39,350	-62.6%	₩28M ($19K)
2025-06-30	BUY	주식매수청구권 행사	김성식 Seongsik Kim	Managing Director	2.5K	₩33,150	+93.1%	₩83M ($58K)
2025-06-02	SELL	Market Sell	김성식 Seongsik Kim	Managing Director	-2.3K	₩32,250	-98.5%	₩74M ($52K)
2025-05-26	BUY	기타	김성식 Seongsik Kim	Managing Director	2.0K	₩30,750	+108.1%	₩62M ($43K)
2025-01-03	SELL	Market Sell	이동석 Lee Dong-seok	moving	-200	₩37,600	-70.2%	₩8M ($5K)
2025-01-02	SELL	증여	이동석 Lee Dong-seok	moving	-1.8K	₩35,350	-81.0%	₩64M ($44K)
2024-12-04	BUY	주식매수청구권 행사	손현태 Hyuntae Son	Managing Director	4.0K	₩41,800	+53.1%	₩167M ($116K)
2024-12-04	BUY	주식매수청구권 행사	하두성 Ha Doo-seong	moving	100	₩41,800	+53.1%	₩4M ($3K)
2024-11-19	BUY	Market Buy	이동석 Lee Dong-seok	president	100	₩43,550	+47.0%	₩4M ($3K)
2024-11-14	BUY	Market Buy	이동석 Lee Dong-seok	president	200	₩46,200	+38.5%	₩9M ($6K)
2024-10-24	SELL	Market Sell	김성식 Seongsik Kim	Managing Director	-600	₩52,500	-21.9%	₩32M ($22K)
2024-10-23	SELL	Market Sell	김성식 Seongsik Kim	Managing Director	-800	₩54,000	-18.5%	₩43M ($30K)
2024-10-04	SELL	Market Sell	손현태 Hyuntae Son	moving	-2.0K	₩58,300	-9.8%	₩117M ($81K)
2024-08-20	SELL	Market Sell	김성식 Seongsik Kim	Managing Director	-600	₩54,300	-17.9%	₩33M ($23K)
2024-05-30	SELL	증여	이동석 Lee Dong-seok	president	-1.0K	₩80,300	+20.3%	₩80M ($56K)
2024-05-24	BUY	주식매수선택권	장선우 Seonwoo Jang	moving	2.6K	₩80,200	-20.2%	₩212M ($147K)
2024-05-24	BUY	주식매수선택권	이동석 Lee Dong-seok	president	2.0K	₩80,200	-20.2%	₩160M ($111K)
2024-05-24	BUY	주식매수선택권	김형덕 Kim Hyeong-deok	moving	6.0K	₩80,200	-20.2%	₩481M ($334K)
2024-04-11	BUY	Market Buy	전권 full volume	moving	188	₩78,900	-18.9%	₩15M ($10K)
2024-04-09	SELL	Market Sell	하두성 Ha Doo-seong	moving	-2.6K	₩79,300	+19.3%	₩206M ($143K)
2024-02-23	BUY	PROGRAM	이동석 Lee Dong-seok	president	2.0K	₩93,300	-31.4%	₩187M ($130K)
2024-02-23	BUY	PROGRAM	김형덕 Kim Hyeong-deok	moving	2.1K	₩93,300	-31.4%	₩196M ($136K)
2024-02-23	BUY	PROGRAM	하두성 Ha Doo-seong	moving	100	₩93,300	-31.4%	₩9M ($6K)
2024-02-23	BUY	PROGRAM	장선우 Seonwoo Jang	moving	1.6K	₩93,300	-31.4%	₩148M ($103K)
2024-02-23	BUY	PROGRAM	염광현 Gwanghyeon Yeom	Managing Director	2.0K	₩93,300	-31.4%	₩187M ($130K)
2024-02-23	BUY	PROGRAM	마재용 Ma Jaeyong	Managing Director	1.4K	₩93,300	-31.4%	₩131M ($91K)

Frequently asked questions

Who has been buying Seongil Hitech stock?: 7 distinct insiders have filed 4 disclosed insider purchases in Seongil Hitech (365340), most recently on 2026-05-09. 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 Seongil Hitech have?: Seongil Hitech has 4 buy-side and 15 sell-side disclosures on record, covering ₩1.4B ($958K) in total reported value, spanning 2024-02-23 to 2026-05-09.
Where does StockDrifts get Seongil Hitech 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 Seongil Hitech. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.