Who has been buying Gemvax stock?

3 distinct insiders have filed 1 disclosed insider purchases in Gemvax (082270), most recently on 2026-06-17. 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 Gemvax have?

Gemvax has 1 buy-side and 22 sell-side disclosures on record, covering ₩161M ($112K) in total reported value, spanning 2023-11-17 to 2026-06-17.

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.

Gemvax 082270

Company

젬백스Gemvax

Insiders

Buys

Total Value

₩161M ($112K)

Avg Return

-104.58%

Last Filing

2026-06-17

Gemvax (082270) has 1 disclosed insider purchases and 22 disclosed disposals on record, filed by 3 distinct insiders. Together those filings cover ₩161M ($112K) in reported transaction value. The earliest filing StockDrifts holds for Gemvax is dated 2023-11-17; the most recent is 2026-06-17.

Price & insider activity (12 months)

Recent insider trades

Date	Type	Source	Insider	Position	Shares	Price at filing	Return	Value
2026-09-11	BUY	자사주상여금	시원혁 Siwonhyuk	Managing Director	5.0K	₩10,280	-0.8%	₩51M ($36K)
2026-09-11	BUY	자사주상여금	이석준 Seokjun Lee	CEO	23.0K	₩10,280	-0.8%	₩236M ($164K)
2026-09-11	BUY	자사주상여금	남승민 Seungmin Nam	vice president	5.0K	₩10,280	-0.8%	₩51M ($36K)
2026-09-11	BUY	신규보고	문형식 Moon Hyeong-sik	president	18.3K	₩10,280	-0.8%	₩188M ($130K)
2026-09-11	BUY	자사주상여금	문형식 Moon Hyeong-sik	president	18.0K	₩10,280	-0.8%	₩185M ($129K)
2026-09-11	BUY	자사주상여금	김정미 Kim Jeong-mi	Managing Director	3.0K	₩10,280	-0.8%	₩31M ($21K)
2026-09-10	SELL	대여	젬앤컴퍼니 Gem & Company	-	-23.0K	₩10,310	-0.8%	₩237M ($165K)
2026-09-10	BUY	차입	김상재 Sangjae Kim	-	23.0K	₩10,310	+0.8%	₩237M ($165K)
2026-09-10	SELL	대물변제	김상재 Sangjae Kim	-	-23.0K	₩10,310	-0.8%	₩237M ($165K)
2026-09-03	SELL	대물변제	김상재 Sangjae Kim	-	-196.9K	-	-	-
2026-08-31	BUY	Market Buy	민택근 Taekgeun Min	president	2.0K	₩11,340	-5.3%	₩22M ($15K)
2026-08-24	BUY	신규보고	민택근 Taekgeun Min	president	2.0K	₩10,920	-1.6%	₩22M ($15K)
2026-08-21	BUY	제3자배정유상증자	김기호 Kiho Kim	CEO	86.5K	₩10,120	+13.1%	₩1000M ($694K)
2026-08-13	SELL	Market Sell	김기호 Kiho Kim	CEO	-19.2K	-	-	-
2026-08-12	SELL	Market Sell	김기호 Kiho Kim	CEO	-60.6K	-	-	-
2026-08-11	SELL	Market Sell	김기호 Kiho Kim	CEO	-3.1K	-	-	-
2026-08-10	SELL	Market Sell	김기호 Kiho Kim	CEO	-3.6K	-	-	-
2026-06-17	BUY	신규보고	남경필 Nam Kyung-pil	Chairman	55.3K	-	-	-
2026-03-30	SELL	장외매도	젬앤컴퍼니 Gem & Company	-	-42.1K	₩41,750	+39.5%	₩1.8B ($1.2M)
2026-03-23	BUY	기타	젬앤컴퍼니 Gem & Company	-	199.8K	₩35,650	+15.2%	₩7.1B ($4.9M)
2026-03-23	SELL	기타	김상재 Sangjae Kim	-	-199.8K	₩35,650	-15.2%	₩7.1B ($4.9M)
2026-03-13	BUY	기타	젬앤컴퍼니 Gem & Company	-	150.0K	₩38,800	+5.8%	₩5.8B ($4.0M)
2026-03-06	BUY	기타	젬앤컴퍼니 Gem & Company	-	210.0K	₩43,550	-5.7%	₩9.1B ($6.4M)
2026-03-06	SELL	기타	김상재 Sangjae Kim	-	-210.0K	₩43,550	+5.7%	₩9.1B ($6.4M)
2026-02-24	SELL	대물변제	김상재 Sangjae Kim	-	-50.9K	₩39,700	-3.4%	₩2.0B ($1.4M)
2026-02-24	SELL	대물변제	김상재 Sangjae Kim	-	-62.5K	₩39,700	-3.4%	₩2.5B ($1.7M)
2026-02-23	BUY	신주인수권사채의권리행사	젬앤컴퍼니 Gem & Company	-	412.2K	₩43,200	-5.0%	₩17.8B ($12.4M)
2026-02-23	SELL	전환등	젬앤컴퍼니 Gem & Company	-	-412.3K	₩43,200	+5.0%	₩17.8B ($12.4M)
2025-12-31	SELL	대물변제	젬앤컴퍼니 Gem & Company	-	-3.4K	₩30,600	-34.1%	₩106M ($73K)
2025-12-31	SELL	대물변제	젬앤컴퍼니 Gem & Company	-	-13.8K	₩30,600	-34.1%	₩422M ($293K)
2025-12-31	SELL	장외매도	젬앤컴퍼니 Gem & Company	-	-3.4K	₩30,600	-34.1%	₩106M ($73K)
2025-12-31	SELL	대물변제	젬앤컴퍼니 Gem & Company	-	-3.4K	₩30,600	-34.1%	₩106M ($73K)
2025-12-31	SELL	장외매도	젬앤컴퍼니 Gem & Company	-	-3.4K	₩30,600	-34.1%	₩106M ($73K)
2025-12-30	SELL	대물변제	젬앤컴퍼니 Gem & Company	-	-103.6K	₩29,000	-41.5%	₩3.0B ($2.1M)
2025-12-29	SELL	대물변제	젬앤컴퍼니 Gem & Company	-	-38.5K	₩28,950	-41.8%	₩1.1B ($775K)
2025-12-13	SELL	Market Sell	곽소현 Kwak Sohyun	moving	-100	₩28,750	-42.8%	₩3M ($2K)
2025-12-05	SELL	대여	젬앤컴퍼니 Gem & Company	-	-150.0K	₩32,550	-26.1%	₩4.9B ($3.4M)
2025-07-16	SELL	기타	김상재 Sangjae Kim	-	-224.0K	₩58,100	+29.4%	₩13.0B ($9.0M)
2025-07-16	BUY	기타	젬앤컴퍼니 Gem & Company	-	224.0K	₩58,100	-29.4%	₩13.0B ($9.0M)
2025-05-28	SELL	Market Sell	곽소현 Kwak Sohyun	moving	-600	₩47,900	+14.3%	₩29M ($20K)
2025-04-14	SELL	Market Sell	곽소현 Kwak Sohyun	moving	-50	₩32,550	-26.1%	₩2M ($1K)
2025-04-10	SELL	Market Sell	곽소현 Kwak Sohyun	moving	-50	₩31,250	-31.4%	₩2M ($1K)
2025-02-21	SELL	장외매도	젬앤컴퍼니 Gem & Company	-	-193.5K	₩32,500	-26.3%	₩6.3B ($4.4M)
2025-02-21	SELL	장외매도	젬앤컴퍼니 Gem & Company	-	-193.5K	₩32,500	-26.3%	₩6.3B ($4.4M)
2025-02-21	BUY	BW인수	젬앤컴퍼니 Gem & Company	-	841.3K	₩32,500	+26.3%	₩27.3B ($19.0M)
2025-02-13	SELL	Market Sell	김홍현 Honghyun Kim	moving	-200	₩22,500	-82.4%	₩5M ($3K)
2025-02-12	BUY	기타	젬앤컴퍼니 Gem & Company	-	133.0K	₩23,200	+76.9%	₩3.1B ($2.1M)
2025-02-12	SELL	기타	김상재 Sangjae Kim	-	-133.0K	₩23,200	-76.9%	₩3.1B ($2.1M)
2025-02-06	SELL	Market Sell	김홍현 Honghyun Kim	moving	-200	₩20,950	-95.9%	₩4M ($3K)
2025-01-23	SELL	Market Sell	김홍현 Honghyun Kim	moving	-200	₩18,060	-127.3%	₩4M ($3K)

Showing the 50 most recent of 79 filings.

Frequently asked questions

Who has been buying Gemvax stock?: 3 distinct insiders have filed 1 disclosed insider purchases in Gemvax (082270), most recently on 2026-06-17. 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 Gemvax have?: Gemvax has 1 buy-side and 22 sell-side disclosures on record, covering ₩161M ($112K) in total reported value, spanning 2023-11-17 to 2026-06-17.
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.