Who has been buying GMB Korea stock?

7 distinct insiders have filed 28 disclosed insider purchases in GMB Korea (013870), most recently on 2026-07-01. 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 GMB Korea have?

GMB Korea has 28 buy-side and 3 sell-side disclosures on record, covering ₩317M ($220K) in total reported value, spanning 2023-11-13 to 2026-07-01.

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.

GMB Korea 013870

Company

지엠비코리아GMB Korea

Insiders

Buys

Total Value

₩317M ($220K)

Avg Return

+35.72%

Last Filing

2026-07-01

GMB Korea (013870) has 28 disclosed insider purchases and 3 disclosed disposals on record, filed by 7 distinct insiders. Together those filings cover ₩317M ($220K) in reported transaction value. The earliest filing StockDrifts holds for GMB Korea is dated 2023-11-13; the most recent is 2026-07-01. Across these filings the average return since disclosure is +35.72%, 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
2026-07-01	BUY	Market Buy	최완욱 Choi Wan-wook	Managing Director	10.0K	₩3,800	+4.2%	₩38M ($26K)
2026-06-25	BUY	Market Buy	송병영 Byeongyoung Song	CEO	2.0K	₩3,580	-0.4%	₩7M ($5K)
2026-06-04	BUY	Market Buy	차제민 Cha Je-min	Managing Director	5.0K	-	-	-
2026-06-04	BUY	Market Buy	황석보 Seokbo Hwang	Outside Director	1.0K	-	-	-
2026-05-22	BUY	Market Buy	정세영 Jeong Se-young	CEO	2.8K	₩4,475	-9.1%	₩12M ($9K)
2026-05-21	BUY	Market Buy	정세영 Jeong Se-young	CEO	30	₩4,385	-7.2%	₩132K ($91)
2026-05-21	SELL	Market Sell	황석보 Seokbo Hwang	Outside Director	-500	₩4,385	+7.2%	₩2M ($2K)
2026-05-20	BUY	Market Buy	정세영 Jeong Se-young	CEO	2.0K	₩4,270	-4.7%	₩9M ($6K)
2026-04-23	SELL	Market Sell	황석보 Seokbo Hwang	Outside Director	-492	₩5,010	+18.8%	₩2M ($2K)
2026-04-22	SELL	Market Sell	김정국 Kim Jeong-guk	Managing Director	-5.0K	₩5,050	+1.9%	₩25M ($18K)
2026-03-31	BUY	신규선임	김명현 Myeonghyun Kim	Managing Director	3.0K	₩4,780	+3.7%	₩14M ($10K)
2026-03-31	BUY	신규선임	강석천 Seokcheon Kang	Managing Director	1.8K	₩4,780	+3.7%	₩9M ($6K)
2026-02-10	BUY	Market Buy	최완욱 Choi Wan-wook	Managing Director	5.0K	₩5,400	+9.3%	₩27M ($19K)
2026-01-27	BUY	Market Buy	최완욱 Choi Wan-wook	Managing Director	2.0K	₩4,555	+29.5%	₩9M ($6K)
2026-01-21	BUY	Market Buy	최완욱 Choi Wan-wook	Managing Director	2.0K	₩4,675	+26.2%	₩9M ($6K)
2025-11-17	BUY	Market Buy	최완욱 Choi Wan-wook	Managing Director	8.5K	₩3,895	+51.5%	₩33M ($23K)
2025-08-25	BUY	Market Buy	손요환 Son Yohwan	Managing Director	1.5K	₩4,025	+46.6%	₩6M ($4K)
2025-04-24	BUY	Market Buy	정세영 Jeong Se-young	CEO	6.2K	₩3,980	+48.2%	₩25M ($17K)
2024-12-24	BUY	Market Buy	최완욱 Choi Wan-wook	Managing Director	500	₩3,620	+63.0%	₩2M ($1K)
2024-12-20	BUY	Market Buy	최완욱 Choi Wan-wook	Managing Director	1.5K	₩3,680	+60.3%	₩6M ($4K)
2024-12-05	BUY	Market Buy	최완욱 Choi Wan-wook	Managing Director	2.4K	₩3,615	+63.2%	₩9M ($6K)
2024-12-04	BUY	Market Buy	최완욱 Choi Wan-wook	Managing Director	906	₩3,635	+62.3%	₩3M ($2K)
2024-11-29	BUY	Market Buy	최완욱 Choi Wan-wook	Managing Director	240	₩3,785	+55.9%	₩908K ($631)
2024-11-27	BUY	Market Buy	최완욱 Choi Wan-wook	Managing Director	4.7K	₩3,800	+55.3%	₩18M ($12K)
2024-11-26	BUY	Market Buy	최완욱 Choi Wan-wook	Managing Director	5.3K	₩3,740	+57.8%	₩20M ($14K)
2024-11-15	BUY	Market Buy	최완욱 Choi Wan-wook	Managing Director	133	₩3,695	+59.7%	₩491K ($341)
2024-11-14	BUY	Market Buy	최완욱 Choi Wan-wook	Managing Director	1.9K	₩3,680	+60.3%	₩7M ($5K)
2024-11-04	BUY	Market Buy	최완욱 Choi Wan-wook	Managing Director	3.4K	₩3,900	+51.3%	₩13M ($9K)
2024-10-22	BUY	Market Buy	정세영 Jeong Se-young	CEO	6.3K	₩3,825	+54.3%	₩24M ($17K)
2024-08-08	BUY	Market Buy	황석보 Seokbo Hwang	Outside Director	500	₩3,950	+49.4%	₩2M ($1K)
2024-06-11	BUY	Market Buy	황석보 Seokbo Hwang	Outside Director	1.1K	₩4,380	+34.7%	₩5M ($3K)
2024-04-19	BUY	Market Buy	최완욱 Choi Wan-wook	Managing Director	71	₩4,230	+39.5%	₩300K ($209)
2023-11-13	BUY	Market Buy	최완욱 Choi Wan-wook	Managing Director	500	₩4,010	+47.1%	₩2M ($1K)

Frequently asked questions

Who has been buying GMB Korea stock?: 7 distinct insiders have filed 28 disclosed insider purchases in GMB Korea (013870), most recently on 2026-07-01. 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 GMB Korea have?: GMB Korea has 28 buy-side and 3 sell-side disclosures on record, covering ₩317M ($220K) in total reported value, spanning 2023-11-13 to 2026-07-01.
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.