Who has been buying NPK stock?

3 distinct insiders have filed 25 disclosed insider purchases in NPK (048830), most recently on 2026-07-15. 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 NPK have?

NPK has 25 buy-side and 0 sell-side disclosures on record, covering ₩123M ($85K) in total reported value, spanning 2026-03-05 to 2026-07-15.

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.

NPK 048830

Company

엔피케이NPK

Insiders

Buys

Total Value

₩123M ($85K)

Avg Return

+5.85%

Last Filing

2026-07-15

NPK (048830) has 25 disclosed insider purchases and 0 disclosed disposals on record, filed by 3 distinct insiders. Together those filings cover ₩123M ($85K) in reported transaction value. The earliest filing StockDrifts holds for NPK is dated 2026-03-05; the most recent is 2026-07-15. Across these filings the average return since disclosure is +5.85%, 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
2026-07-27	BUY	Market Buy	엔피아이 NPI	-	5.0K	₩1,051	+0.0%	₩5M ($3K)
2026-07-20	BUY	Market Buy	엔피아이 NPI	-	5.0K	₩1,127	-11.1%	₩5M ($4K)
2026-07-20	BUY	Market Buy	김수혁 Soohyuk Kim	Outside Director	10.0K	₩1,127	-11.1%	₩10M ($7K)
2026-07-15	BUY	Market Buy	엔피아이 NPI	-	5.0K	₩1,035	+3.2%	₩5M ($3K)
2026-07-13	BUY	Market Buy	엔피아이 NPI	-	10.0K	₩966	+10.6%	₩9M ($6K)
2026-07-10	BUY	Market Buy	엔피아이 NPI	-	10.0K	₩966	+10.6%	₩9M ($6K)
2026-06-30	BUY	Market Buy	엔피아이 NPI	-	15.0K	₩830	+7.6%	₩12M ($9K)
2026-06-24	BUY	Market Buy	엔피아이 NPI	-	5.0K	₩729	+8.0%	₩4M ($3K)
2026-06-12	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	20.0K	₩829	+0.7%	₩17M ($12K)
2026-06-11	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	5.0K	₩789	+5.8%	₩4M ($3K)
2026-06-10	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	5.0K	₩765	+9.2%	₩4M ($3K)
2026-06-10	BUY	Market Buy	최윤혁 Yunhyeok Choi	vice president	3.7K	₩765	+9.2%	₩3M ($2K)
2026-06-09	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	5.0K	₩797	+4.8%	₩4M ($3K)
2026-06-08	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	10.0K	₩798	+4.6%	₩8M ($6K)
2026-06-05	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	10.5K	-	-	-
2026-06-05	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	10.5K	₩883	-5.4%	₩9M ($6K)
2026-06-04	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	9.5K	₩880	-5.1%	₩8M ($6K)
2026-06-04	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	9.5K	-	-	-
2026-06-02	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	10.0K	₩898	-7.0%	₩9M ($6K)
2026-06-01	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	5.0K	-	-	-
2026-05-29	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	4.0K	-	-	-
2026-05-28	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	6.0K	-	-	-
2026-03-25	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	20.0K	₩901	+31.2%	₩18M ($13K)
2026-03-16	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	10.0K	-	-	-
2026-03-13	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	10.0K	-	-	-
2026-03-12	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	10.0K	-	-	-
2026-03-06	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	20.0K	-	-	-
2026-03-05	BUY	Market Buy	최상건 Choi Sang-geon	Chairman	20.0K	-	-	-

Frequently asked questions

Who has been buying NPK stock?: 3 distinct insiders have filed 25 disclosed insider purchases in NPK (048830), most recently on 2026-07-15. 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 NPK have?: NPK has 25 buy-side and 0 sell-side disclosures on record, covering ₩123M ($85K) in total reported value, spanning 2026-03-05 to 2026-07-15.
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.