Who has been buying Mason Capital stock?

5 distinct insiders have filed 40 disclosed insider purchases in Mason Capital (021880), most recently on 2026-06-19. 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 Mason Capital have?

Mason Capital has 40 buy-side and 0 sell-side disclosures on record, covering ₩420M ($292K) in total reported value, spanning 2025-02-24 to 2026-06-19.

Where does StockDrifts get Mason Capital 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.

Mason Capital 021880

Company

메이슨캐피탈Mason Capital

Insiders

Buys

Total Value

₩420M ($292K)

Avg Return

+8.99%

Last Filing

2026-06-19

Mason Capital (021880) has 40 disclosed insider purchases and 0 disclosed disposals on record, filed by 5 distinct insiders. Together those filings cover ₩420M ($292K) in reported transaction value. The earliest filing StockDrifts holds for Mason Capital is dated 2025-02-24; the most recent is 2026-06-19. 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 +8.99%, 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
2026-08-03	BUY	Market Buy	리드코프 Lidkopf	-	2.5K	₩1,190	+12.9%	₩3M ($2K)
2026-07-31	BUY	Market Buy	리드코프 Lidkopf	-	5.5K	₩1,158	+0.0%	₩6M ($4K)
2026-07-24	BUY	Market Buy	리드코프 Lidkopf	-	5.0K	₩1,154	+0.0%	₩6M ($4K)
2026-07-21	BUY	Market Buy	리드코프 Lidkopf	-	5.5K	₩1,140	+1.2%	₩7M ($5K)
2026-07-16	BUY	Market Buy	리드코프 Lidkopf	-	6.5K	₩1,215	-5.0%	₩8M ($6K)
2026-07-13	BUY	Market Buy	리드코프 Lidkopf	-	108.2K	₩1,350	-14.5%	₩179M ($125K)
2026-06-19	SELL	주식병합	리드코프 Lidkopf	-	-13.4M	₩136	-1083.1%	₩1.8B ($1.3M)
2026-06-19	SELL	주식병합	김태균 Kim Tae-gyun	CEO	-30.0K	₩136	-793.4%	₩4M ($3K)
2026-06-19	SELL	주식병합	성지용 Seongjiyong	Managing Director	-6.5K	₩136	-793.4%	₩884K ($614)
2026-06-19	SELL	주식병합	홍승현 Seunghyun Hong	moving	-1.4K	₩136	-793.4%	₩190K ($132)
2026-06-19	SELL	주식병합	임진성 Im Jin-seong	moving	-1.2K	₩136	-793.4%	₩165K ($114)
2026-06-11	BUY	Market Buy	리드코프 Lidkopf	-	200.0K	-	-	-
2026-06-09	SELL	자본감소	리드코프 Lidkopf	-	-107.1M	₩136	-1083.1%	₩14.6B ($10.1M)
2026-06-09	SELL	자본감소	김태균 Kim Tae-gyun	CEO	-240.0K	₩136	-793.4%	₩33M ($23K)
2026-06-09	SELL	자본감소	임진성 Im Jin-seong	moving	-9.7K	₩136	-793.4%	₩1M ($916)
2026-06-09	SELL	자본감소	홍승현 Seunghyun Hong	moving	-11.2K	₩136	-793.4%	₩2M ($1K)
2026-06-09	SELL	자본감소	성지용 Seongjiyong	Managing Director	-52.0K	₩136	-793.4%	₩7M ($5K)
2026-05-14	BUY	Market Buy	홍승현 Seunghyun Hong	moving	774	-	-	-
2026-05-14	BUY	Market Buy	성지용 Seongjiyong	Managing Director	603	-	-	-
2026-05-13	BUY	Market Buy	성지용 Seongjiyong	Managing Director	10.0K	-	-	-
2026-05-13	BUY	Market Buy	성지용 Seongjiyong	Managing Director	10.0K	-	-	-
2026-05-13	BUY	Market Buy	홍승현 Seunghyun Hong	moving	13.2K	-	-	-
2026-05-13	BUY	Market Buy	성지용 Seongjiyong	Managing Director	10.1K	-	-	-
2026-05-13	BUY	Market Buy	성지용 Seongjiyong	Managing Director	14.4K	-	-	-
2026-05-13	BUY	Market Buy	임진성 Im Jin-seong	moving	12.1K	-	-	-
2026-05-13	BUY	Market Buy	김태균 Kim Tae-gyun	CEO	49.7K	-	-	-
2026-05-13	BUY	Market Buy	김태균 Kim Tae-gyun	CEO	123.9K	-	-	-
2026-05-13	BUY	Market Buy	김태균 Kim Tae-gyun	CEO	30.3K	-	-	-
2026-05-13	BUY	Market Buy	김태균 Kim Tae-gyun	CEO	20.0K	-	-	-
2026-05-13	BUY	Market Buy	성지용 Seongjiyong	Managing Director	19.9K	-	-	-
2026-05-12	BUY	Market Buy	김태균 Kim Tae-gyun	CEO	50.0K	-	-	-
2026-05-12	BUY	Market Buy	김태균 Kim Tae-gyun	CEO	19.1K	-	-	-
2026-05-12	BUY	Market Buy	김태균 Kim Tae-gyun	CEO	7.0K	-	-	-
2025-07-18	BUY	제3자배정유상증자	리드코프 Lidkopf	-	20.0M	₩360	-25.0%	₩7.2B ($5.0M)
2025-06-03	BUY	제3자배정유상증자	리드코프 Lidkopf	-	40.0M	₩504	-46.4%	₩20.2B ($14.0M)
2025-05-15	BUY	장외매수	리드코프 Lidkopf	-	72.0M	₩487	-44.6%	₩35.1B ($24.3M)
2025-05-15	SELL	장외매도	캑터스바이아웃제6호사모투자 Cactus Buyout No. 6 Private Investment	-	-72.0M	₩487	+44.6%	₩35.1B ($24.3M)
2025-04-02	BUY	Market Buy	리드코프 Lidkopf	-	4.6K	₩250	+8.0%	₩1M ($806)
2025-04-01	BUY	Market Buy	리드코프 Lidkopf	-	63.5K	₩254	+6.3%	₩16M ($11K)
2025-03-28	BUY	Market Buy	리드코프 Lidkopf	-	65.3K	₩263	+2.7%	₩17M ($12K)
2025-03-27	BUY	Market Buy	리드코프 Lidkopf	-	87.3K	₩267	+1.1%	₩23M ($16K)
2025-03-26	BUY	Market Buy	리드코프 Lidkopf	-	114.5K	₩267	+1.1%	₩31M ($21K)
2025-03-25	BUY	Market Buy	리드코프 Lidkopf	-	203.7K	₩259	+4.3%	₩53M ($37K)
2025-03-24	BUY	Market Buy	리드코프 Lidkopf	-	242.8K	₩259	+4.3%	₩63M ($44K)
2025-03-21	BUY	Market Buy	리드코프 Lidkopf	-	240.5K	₩260	+3.9%	₩63M ($43K)
2025-03-20	BUY	Market Buy	리드코프 Lidkopf	-	84.0K	₩258	+4.7%	₩22M ($15K)
2025-03-19	BUY	Market Buy	리드코프 Lidkopf	-	26.6K	₩259	+4.3%	₩7M ($5K)
2025-03-17	BUY	Market Buy	리드코프 Lidkopf	-	15.4K	₩248	+8.9%	₩4M ($3K)
2025-03-14	BUY	Market Buy	리드코프 Lidkopf	-	24.8K	₩249	+8.4%	₩6M ($4K)
2025-03-13	BUY	Market Buy	리드코프 Lidkopf	-	32.0K	₩242	+11.6%	₩8M ($5K)

Showing the 50 most recent of 60 filings.

Frequently asked questions

Who has been buying Mason Capital stock?: 5 distinct insiders have filed 40 disclosed insider purchases in Mason Capital (021880), most recently on 2026-06-19. 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 Mason Capital have?: Mason Capital has 40 buy-side and 0 sell-side disclosures on record, covering ₩420M ($292K) in total reported value, spanning 2025-02-24 to 2026-06-19.
Where does StockDrifts get Mason Capital 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 Mason Capital. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.