Who has been buying Non-conservative constraints stock?

5 distinct insiders have filed 26 disclosed insider purchases in Non-conservative constraints (082800), most recently on 2026-04-30. 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 Non-conservative constraints have?

Non-conservative constraints has 26 buy-side and 13 sell-side disclosures on record, covering ₩6.2B ($4.3M) in total reported value, spanning 2023-10-24 to 2026-04-30.

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.

Non-conservative constraints 082800

Company

비보존 제약Non-conservative constraints

Insiders

Buys

Total Value

₩6.2B ($4.3M)

Avg Return

+21.63%

Last Filing

2026-04-30

Non-conservative constraints (082800) has 26 disclosed insider purchases and 13 disclosed disposals on record, filed by 5 distinct insiders. Together those filings cover ₩6.2B ($4.3M) in reported transaction value. The earliest filing StockDrifts holds for Non-conservative constraints is dated 2023-10-24; the most recent is 2026-04-30. Across these filings the average return since disclosure is +21.63%, 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
2026-08-21	SELL	Market Sell	비보존홀딩스 Bijeon Holdings	-	-100.0K	₩3,170	+10.1%	₩354M ($246K)
2026-07-31	SELL	풋옵션권리행사에따른주식처분	비보존 non-preservation	-	-277.8K	₩2,345	-20.0%	₩651M ($452K)
2026-04-30	SELL	풋옵션권리행사에따른주식처분	비보존 non-preservation	-	-277.8K	₩3,230	+5.9%	₩897M ($623K)
2026-04-15	BUY	자사주상여금	손인동 Son In-dong	Internal director	5.9K	₩3,140	+5.6%	₩19M ($13K)
2026-04-15	BUY	자사주상여금	장욱수 Wooksu Jang	Managing Director	2.0K	₩3,140	+5.6%	₩6M ($4K)
2026-03-31	SELL	풋옵션권리행사에따른주식처분	비보존 non-preservation	-	-181.0K	₩3,225	-2.8%	₩584M ($405K)
2026-03-31	BUY	신규선임	고수언 Go Soo-eon	Internal director	11.7K	₩3,225	+2.8%	₩38M ($26K)
2026-03-05	BUY	PROGRAM	이두현 Doohyun Lee	Internal director	16.2K	₩4,015	-17.4%	₩65M ($45K)
2026-03-05	BUY	PROGRAM	박상성 Sangseong Park	Managing Director	1.3K	₩4,015	-17.4%	₩5M ($4K)
2026-03-05	BUY	PROGRAM	이현민 Hyunmin Lee	moving	3.6K	₩4,015	-17.4%	₩14M ($10K)
2026-03-05	BUY	유상신주취득	박한수 Park Hansu	Managing Director	2.4K	₩4,015	-17.4%	₩10M ($7K)
2026-03-05	BUY	유상신주취득	장부환 Bu-hwan Jang	CEO	10.7K	₩4,015	-17.4%	₩43M ($30K)
2026-03-05	SELL	기타	이지연 Jiyeon Lee	moving	-211	₩4,015	+17.4%	₩847K ($588)
2026-03-05	BUY	PROGRAM	비보존홀딩스 Bijeon Holdings	-	533.9K	₩4,015	-17.4%	₩2.1B ($1.5M)
2026-03-05	BUY	유상신주취득	박재심 Jaesim Park	Managing Director	761	₩4,015	-17.4%	₩3M ($2K)
2026-03-05	BUY	PROGRAM	이지연 Jiyeon Lee	moving	241	₩4,015	-17.4%	₩968K ($672)
2026-03-05	BUY	PROGRAM	이풍석 Lee Pung-seok	Managing Director	503	₩4,015	-17.4%	₩2M ($1K)
2026-03-05	SELL	기타	이현민 Hyunmin Lee	moving	-3.1K	₩4,015	+17.4%	₩12M ($9K)
2026-03-05	SELL	기타	비보존홀딩스 Bijeon Holdings	-	-533.9K	₩4,015	+17.4%	₩2.1B ($1.5M)
2026-03-05	SELL	기타	박상성 Sangseong Park	Managing Director	-2.2K	₩4,015	+17.4%	₩9M ($6K)
2026-03-05	SELL	기타	이두현 Doohyun Lee	Internal director	-14.0K	₩4,015	+17.4%	₩56M ($39K)
2026-03-05	SELL	기타	이풍석 Lee Pung-seok	Managing Director	-435	₩4,015	+17.4%	₩2M ($1K)
2026-03-05	SELL	기타	박재심 Jaesim Park	Managing Director	-658	₩4,015	+17.4%	₩3M ($2K)
2026-03-05	SELL	기타	박한수 Park Hansu	Managing Director	-2.1K	₩4,015	+17.4%	₩8M ($6K)
2026-03-05	SELL	기타	장부환 Bu-hwan Jang	CEO	-9.2K	₩4,015	+17.4%	₩37M ($26K)
2026-02-09	BUY	기타	박재심 Jaesim Park	Managing Director	500	₩4,400	-24.7%	₩2M ($2K)
2026-02-02	SELL	기타	비보존홀딩스 Bijeon Holdings	-	-2.1M	₩4,725	+29.8%	₩10.1B ($7.0M)
2026-02-02	SELL	기타	비보존 non-preservation	-	-1.1M	₩4,725	+29.8%	₩5.1B ($3.5M)
2026-01-26	BUY	PROGRAM	이지연 Jiyeon Lee	moving	211	₩5,080	-34.7%	₩1M ($744)
2026-01-26	BUY	PROGRAM	박상성 Sangseong Park	Managing Director	2.2K	₩5,080	-34.7%	₩11M ($8K)
2026-01-26	BUY	PROGRAM	박재심 Jaesim Park	Managing Director	158	₩5,080	-34.7%	₩803K ($557)
2026-01-26	BUY	PROGRAM	비보존홀딩스 Bijeon Holdings	-	2.7M	₩5,080	-34.7%	₩13.6B ($9.4M)
2026-01-26	BUY	PROGRAM	조흥제 Choheungje	Managing Director	1.7K	₩5,080	-34.7%	₩9M ($6K)
2026-01-26	BUY	기타	이학종 Hakjong Lee	moving	214	₩5,080	-34.7%	₩1M ($755)
2026-01-26	BUY	PROGRAM	이풍석 Lee Pung-seok	Managing Director	435	₩5,080	-34.7%	₩2M ($2K)
2026-01-26	BUY	기타	장부환 Bu-hwan Jang	CEO	9.2K	₩5,080	-34.7%	₩47M ($33K)
2026-01-26	BUY	PROGRAM	이두현 Doohyun Lee	Internal director	14.0K	₩5,080	-34.7%	₩71M ($49K)
2026-01-26	BUY	PROGRAM	이현민 Hyunmin Lee	moving	3.1K	₩5,080	-34.7%	₩16M ($11K)
2026-01-26	BUY	PROGRAM	박한수 Park Hansu	Managing Director	2.1K	₩5,080	-34.7%	₩11M ($7K)
2026-01-26	BUY	PROGRAM	비보존 non-preservation	-	1.1M	₩5,080	-34.7%	₩5.5B ($3.8M)
2025-12-04	BUY	기타	이현민 Hyunmin Lee	moving	3.0K	₩4,148	-20.1%	₩12M ($9K)
2025-11-25	BUY	Market Buy	이두현 Doohyun Lee	Internal director	11.0K	₩4,038	-17.9%	₩44M ($31K)
2025-11-21	BUY	Market Buy	이두현 Doohyun Lee	Internal director	9.8K	₩4,148	-20.1%	₩41M ($28K)
2025-09-08	SELL	교환	비보존홀딩스 Bijeon Holdings	-	-121.0K	₩7,745	+57.2%	₩937M ($651K)
2025-09-04	SELL	교환	비보존홀딩스 Bijeon Holdings	-	-257.2K	₩6,994	+52.6%	₩1.8B ($1.2M)
2025-07-15	SELL	교환	비보존홀딩스 Bijeon Holdings	-	-30.3K	₩7,792	+57.5%	₩236M ($164K)
2025-07-14	SELL	교환	비보존홀딩스 Bijeon Holdings	-	-30.3K	₩7,174	+53.8%	₩217M ($151K)
2025-07-11	SELL	교환	비보존홀딩스 Bijeon Holdings	-	-15.1K	₩6,899	+52.0%	₩104M ($72K)
2025-06-12	BUY	Market Buy	이두현 Doohyun Lee	Internal director	3.5K	₩5,720	-42.0%	₩20M ($14K)
2025-06-11	BUY	Market Buy	이두현 Doohyun Lee	Internal director	5.0K	₩5,625	-41.1%	₩28M ($20K)

Showing the 50 most recent of 95 filings.

Frequently asked questions

Who has been buying Non-conservative constraints stock?: 5 distinct insiders have filed 26 disclosed insider purchases in Non-conservative constraints (082800), most recently on 2026-04-30. 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 Non-conservative constraints have?: Non-conservative constraints has 26 buy-side and 13 sell-side disclosures on record, covering ₩6.2B ($4.3M) in total reported value, spanning 2023-10-24 to 2026-04-30.
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.