Who has been buying Castec Korea stock?

6 distinct insiders have filed 243 disclosed insider purchases in Castec Korea (071850), most recently on 2026-04-20. 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 Castec Korea have?

Castec Korea has 243 buy-side and 13 sell-side disclosures on record, covering ₩4.4B ($3.1M) in total reported value, spanning 2022-06-08 to 2026-04-20.

Where does StockDrifts get Castec Korea 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.

Castec Korea 071850

Company

캐스텍코리아Castec Korea

Insiders

Buys

243

Total Value

₩4.4B ($3.1M)

Avg Return

-2.54%

Last Filing

2026-04-20

Castec Korea (071850) has 243 disclosed insider purchases and 13 disclosed disposals on record, filed by 6 distinct insiders. Together those filings cover ₩4.4B ($3.1M) in reported transaction value. The earliest filing StockDrifts holds for Castec Korea is dated 2022-06-08; the most recent is 2026-04-20. 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 -2.54%, 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
2026-04-20	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	320	₩1,505	-1.7%	₩482K ($334)
2026-04-17	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	300	₩1,520	-2.6%	₩456K ($317)
2026-04-16	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	10	₩1,525	-3.0%	₩15K ($11)
2026-04-15	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	20	₩1,514	-2.3%	₩30K ($21)
2026-04-14	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	15	₩1,510	-2.0%	₩23K ($16)
2026-04-13	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	100	₩1,490	-0.7%	₩149K ($103)
2026-04-10	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	550	₩1,500	-1.3%	₩825K ($573)
2026-04-09	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	230	₩1,538	-3.8%	₩354K ($246)
2026-04-03	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	300	₩1,519	+0.7%	₩456K ($316)
2026-04-01	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	100	₩1,523	+0.4%	₩152K ($106)
2026-03-31	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	700	₩1,495	+2.3%	₩1M ($727)
2026-03-30	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	270	₩1,527	+0.1%	₩412K ($286)
2026-03-27	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	150	₩1,560	-2.0%	₩234K ($163)
2026-03-26	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	20	₩1,544	-1.0%	₩31K ($21)
2026-03-25	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	10	₩1,554	+0.4%	₩16K ($11)
2026-03-24	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	110	₩1,523	+2.4%	₩168K ($116)
2026-03-23	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	210	₩1,574	-0.9%	₩331K ($230)
2026-03-20	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	12	₩1,572	-0.8%	₩19K ($13)
2026-03-19	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	650	₩1,563	-0.2%	₩1M ($706)
2026-03-18	BUY	Market Buy	윤호성 Yun Ho-seong	CEO	1.9K	₩1,499	+4.1%	₩3M ($2K)
2026-03-16	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	380	₩1,445	+8.0%	₩549K ($381)
2026-03-13	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	180	₩1,460	+6.8%	₩263K ($183)
2026-03-12	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	2.2K	₩1,479	+5.5%	₩3M ($2K)
2026-03-11	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	650	₩1,479	+5.5%	₩961K ($668)
2026-03-10	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	1.4K	₩1,479	+5.5%	₩2M ($1K)
2026-03-09	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	2.9K	₩1,450	+7.6%	₩4M ($3K)
2026-03-06	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	4.1K	₩1,455	+7.2%	₩6M ($4K)
2026-03-05	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	280	₩1,450	+7.6%	₩406K ($282)
2026-03-04	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	1.4K	₩1,473	+5.9%	₩2M ($1K)
2026-03-03	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	160	₩1,484	+5.1%	₩237K ($165)
2026-02-27	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	730	₩1,481	+5.3%	₩1M ($751)
2026-02-26	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	640	₩1,467	+6.3%	₩939K ($652)
2026-02-26	BUY	Market Buy	윤호석 Yoon Hoseok	moving	3.3K	₩1,467	+6.3%	₩5M ($3K)
2026-02-25	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	590	₩1,490	+4.7%	₩879K ($610)
2026-02-24	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	40	₩1,501	+3.9%	₩60K ($42)
2026-02-23	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	1.3K	₩1,506	+3.6%	₩2M ($1K)
2026-02-20	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	300	₩1,509	+3.4%	₩453K ($314)
2026-02-19	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	24	₩1,513	+3.1%	₩36K ($25)
2026-02-13	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	20	₩1,539	+1.4%	₩31K ($21)
2026-02-12	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	12	₩1,539	+1.4%	₩18K ($13)
2026-02-11	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	600	₩1,538	+1.4%	₩923K ($641)
2026-02-10	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	560	₩1,537	+1.5%	₩861K ($598)
2026-02-09	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	190	₩1,529	+2.0%	₩291K ($202)
2026-02-06	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	1.4K	₩1,528	+2.1%	₩2M ($2K)
2026-02-05	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	200	₩1,517	+2.8%	₩303K ($211)
2026-02-04	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	410	₩1,500	+4.0%	₩615K ($427)
2026-02-03	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	180	₩1,499	+4.1%	₩270K ($187)
2026-02-02	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	1.7K	₩1,512	+3.2%	₩3M ($2K)
2026-01-30	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	800	₩1,531	+1.9%	₩1M ($851)
2026-01-29	BUY	Market Buy	윤호성 Yun Ho-seong	Managing Director	31	₩1,527	+2.2%	₩47K ($33)

Showing the 50 most recent of 200 filings.

Frequently asked questions

Who has been buying Castec Korea stock?: 6 distinct insiders have filed 243 disclosed insider purchases in Castec Korea (071850), most recently on 2026-04-20. 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 Castec Korea have?: Castec Korea has 243 buy-side and 13 sell-side disclosures on record, covering ₩4.4B ($3.1M) in total reported value, spanning 2022-06-08 to 2026-04-20.
Where does StockDrifts get Castec Korea 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 Castec Korea. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.