Who has been buying Justem stock?

9 distinct insiders have filed 17 disclosed insider purchases in Justem (417840), most recently on 2026-06-23. 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 Justem have?

Justem has 17 buy-side and 4 sell-side disclosures on record, covering ₩1.1B ($745K) in total reported value, spanning 2024-03-08 to 2026-06-23.

Where does StockDrifts get Justem 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.

Justem 417840

Company

저스템Justem

Insiders

Buys

Total Value

₩1.1B ($745K)

Avg Return

+63.22%

Last Filing

2026-06-23

Justem (417840) has 17 disclosed insider purchases and 4 disclosed disposals on record, filed by 9 distinct insiders. Together those filings cover ₩1.1B ($745K) in reported transaction value. The earliest filing StockDrifts holds for Justem is dated 2024-03-08; the most recent is 2026-06-23. 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 +63.22%, 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
2026-06-23	BUY	Market Buy	김선식 Seonsik Kim	vice president	400	₩12,400	+8.4%	₩5M ($3K)
2026-06-04	BUY	Market Buy	김선식 Seonsik Kim	vice president	300	₩15,990	-8.3%	₩5M ($3K)
2026-06-01	BUY	Market Buy	김선식 Seonsik Kim	vice president	500	₩16,130	-9.1%	₩8M ($6K)
2026-06-01	BUY	주식매수선택권	나동근 Na Dong-geun	vice president	22.0K	₩16,130	+7.4%	₩355M ($246K)
2026-06-01	BUY	주식매수선택권	조광희 Jo Kwang-hee	Outside Director	7.5K	₩16,130	+7.4%	₩121M ($84K)
2026-06-01	BUY	주식매수선택권	배도인 Baedoin	vice president	30.0K	₩16,130	+7.4%	₩484M ($336K)
2026-06-01	BUY	주식매수선택권	임진수 Jinsu Lim	moving	5.0K	₩16,130	+7.4%	₩81M ($56K)
2026-05-27	SELL	시간외매매	김용진 Yongjin Kim	COO	-200.0K	₩18,990	+5.7%	₩3.8B ($2.6M)
2026-05-27	SELL	시간외매매	하정민 Ha Jeong-min	vice president	-50.0K	₩18,990	+5.7%	₩950M ($659K)
2026-05-27	SELL	시간외매매	이미애 Lee Mi-ae	vice president	-150.0K	₩18,990	+5.7%	₩2.8B ($2.0M)
2026-05-27	SELL	시간외매매	임영진 Youngjin Lim	CEO	-200.0K	₩18,990	+5.7%	₩3.8B ($2.6M)
2026-05-26	SELL	Market Sell	배도인 Baedoin	vice president	-10.0K	₩18,540	+3.5%	₩185M ($129K)
2026-05-21	BUY	Market Buy	안호상 Ahn Ho-sang	moving	1.0K	₩18,110	-1.2%	₩18M ($13K)
2026-05-21	SELL	Market Sell	임진수 Jinsu Lim	moving	-5.0K	₩18,110	+1.2%	₩91M ($63K)
2026-05-18	BUY	Market Buy	안호상 Ahn Ho-sang	moving	4.0K	₩17,010	+5.2%	₩68M ($47K)
2026-05-15	BUY	Market Buy	김선식 Seonsik Kim	vice president	600	₩16,100	+11.2%	₩10M ($7K)
2026-05-14	BUY	Market Buy	김선식 Seonsik Kim	vice president	600	₩17,250	+3.8%	₩10M ($7K)
2026-04-17	SELL	Market Sell	권태호 Taeho Kwon	thanks	-7.5K	₩10,620	-6.4%	₩80M ($55K)
2026-03-31	BUY	자사주상여금	하정민 Ha Jeong-min	vice president	6.3K	₩6,300	+71.0%	₩40M ($28K)
2026-03-31	BUY	자사주상여금	이미애 Lee Mi-ae	vice president	6.3K	₩6,300	+71.0%	₩40M ($28K)
2026-03-31	BUY	자사주상여금	김용진 Yongjin Kim	COO	6.3K	₩6,300	+71.0%	₩40M ($28K)
2026-03-31	BUY	자사주상여금	우인근 Woo In-geun	moving	4.5K	₩6,300	+71.0%	₩28M ($20K)
2026-03-31	BUY	자사주상여금	임영진 Youngjin Lim	CEO	72.4K	₩6,300	+71.0%	₩456M ($317K)
2026-03-12	BUY	주식매수선택권	하정민 Ha Jeong-min	vice president	19.0K	-	-	-
2026-03-12	BUY	주식매수선택권	우인근 Woo In-geun	moving	19.5K	-	-	-
2026-03-12	BUY	주식매수선택권	임진수 Jinsu Lim	moving	5.0K	-	-	-
2026-03-12	BUY	주식매수선택권	고대홍 ancient red	Outside Director	10.5K	-	-	-
2026-03-12	BUY	주식매수선택권	권태호 Taeho Kwon	thanks	7.5K	-	-	-
2026-01-02	BUY	PROGRAM	나동근 Na Dong-geun	vice president	92.4K	₩5,580	+21.0%	₩516M ($358K)
2026-01-02	BUY	PROGRAM	임영진 Youngjin Lim	CEO	3.8M	₩5,580	+21.0%	₩21.2B ($14.7M)
2026-01-02	BUY	PROGRAM	김용진 Yongjin Kim	COO	462.0K	₩5,580	+21.0%	₩2.6B ($1.8M)
2026-01-02	BUY	PROGRAM	황희수 Hwang Hee-su	vice president	4.0K	₩5,580	+21.0%	₩22M ($16K)
2026-01-02	BUY	PROGRAM	배도인 Baedoin	vice president	18.0K	₩5,580	+21.0%	₩100M ($70K)
2026-01-02	BUY	PROGRAM	하정민 Ha Jeong-min	vice president	34.0K	₩5,580	+21.0%	₩190M ($132K)
2026-01-02	BUY	PROGRAM	박태서 Park Tae-seo	vice president	10.0K	₩5,580	+21.0%	₩56M ($39K)
2025-05-12	BUY	Market Buy	박태서 Park Tae-seo	vice president	2.0K	₩2,640	+155.7%	₩5M ($4K)
2025-05-09	BUY	Market Buy	박태서 Park Tae-seo	vice president	3.0K	₩2,532	+166.6%	₩8M ($5K)
2025-05-02	BUY	주식매수선택권	이미애 Lee Mi-ae	vice president	1.1K	₩2,447	+175.8%	₩3M ($2K)
2025-05-02	BUY	주식매수선택권	하정민 Ha Jeong-min	vice president	5.0K	₩2,447	+175.8%	₩12M ($8K)
2024-10-22	BUY	Market Buy	황희수 Hwang Hee-su	vice president	1.0K	₩2,640	+155.7%	₩3M ($2K)
2024-09-23	BUY	Market Buy	배도인 Baedoin	vice president	1.0K	₩2,941	+129.5%	₩3M ($2K)
2024-09-20	BUY	Market Buy	배도인 Baedoin	vice president	1.5K	₩2,752	+145.3%	₩4M ($3K)
2024-09-12	BUY	Market Buy	배도인 Baedoin	vice president	3.0K	₩3,063	+120.4%	₩9M ($6K)
2024-09-11	BUY	Market Buy	배도인 Baedoin	vice president	3.5K	₩2,897	+133.0%	₩10M ($7K)
2024-08-22	BUY	Market Buy	임영진 Youngjin Lim	CEO	46.8K	₩2,995	+125.4%	₩140M ($97K)
2024-08-22	BUY	Market Buy	황희수 Hwang Hee-su	vice president	1.0K	₩2,995	+125.4%	₩3M ($2K)
2024-08-21	BUY	Market Buy	임영진 Youngjin Lim	CEO	56.2K	₩3,158	+113.7%	₩177M ($123K)
2024-05-02	SELL	Market Sell	윤희용 Heeyong Yoon	vice president	-51.7K	₩4,461	-51.3%	₩231M ($160K)
2024-03-08	BUY	주식매수선택권	하정민 Ha Jeong-min	vice president	12.0K	₩5,555	+21.5%	₩67M ($46K)

Frequently asked questions

Who has been buying Justem stock?: 9 distinct insiders have filed 17 disclosed insider purchases in Justem (417840), most recently on 2026-06-23. 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 Justem have?: Justem has 17 buy-side and 4 sell-side disclosures on record, covering ₩1.1B ($745K) in total reported value, spanning 2024-03-08 to 2026-06-23.
Where does StockDrifts get Justem 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 Justem. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.