StockDrifts LogoStockDrifts

costexis 355150

Company
코스텍시스costexis
Insiders
2
Buys
1
Total Value
₩37M ($26K)
Avg Return
+31.51%
Last Filing
2026-05-08

costexis (355150) has 1 disclosed insider purchases and 1 disclosed disposals on record, filed by 2 distinct insiders. Together those filings cover ₩37M ($26K) in reported transaction value. The earliest filing StockDrifts holds for costexis is dated 2023-03-21; the most recent is 2026-05-08. 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 +31.51%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent insider trades

DateTypeSourceInsiderPositionSharesPrice at filingReturnValue
2026-05-08SELLMarket Sell
허만인
Heo Man-in
Managing Director-570₩55,100+6.7%₩31M ($22K)
2025-04-16SELL증여
한규진
Gyujin Han
CEO-2.2M₩6,450-180.6%₩14.2B ($9.9M)
2025-04-16BUY수증
한태성
Han Tae-seong
Internal director2.1M₩6,450+180.6%₩13.5B ($9.4M)
2024-05-24BUYMarket Buy
이승주
Seungju Lee
Managing Director465₩11,580+56.3%₩5M ($4K)
2023-03-21BUY합병
유비쿼스인베스트먼트
Ubiquis Investment
-1.3M₩15,475+17.0%₩19.9B ($13.8M)

Frequently asked questions

Who has been buying costexis stock?
2 distinct insiders have filed 1 disclosed insider purchases in costexis (355150), most recently on 2026-05-08. 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 costexis have?
costexis has 1 buy-side and 1 sell-side disclosures on record, covering ₩37M ($26K) in total reported value, spanning 2023-03-21 to 2026-05-08.
Where does StockDrifts get costexis 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 costexis. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.