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Osstem 031510

Company
오스템Osstem
Insiders
2
Buys
27
Total Value
₩553M ($384K)
Avg Return
-18.00%
Last Filing
2026-06-29

Osstem (031510) has 27 disclosed insider purchases and 0 disclosed disposals on record, filed by 2 distinct insiders. Together those filings cover ₩553M ($384K) in reported transaction value. The earliest filing StockDrifts holds for Osstem is dated 2024-04-08; the most recent is 2026-06-29. Across these filings the average return since disclosure is -18.00%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent insider trades

DateTypeSourceInsiderPositionSharesPrice at filingReturnValue
2026-06-29BUYMarket Buy
김정우
Kim Jeong-woo
CEO40.0K---
2026-06-26BUYMarket Buy
김정우
Kim Jeong-woo
CEO80.0K---
2026-06-25BUYMarket Buy
김정우
Kim Jeong-woo
CEO40.0K---
2026-04-03BUYMarket Buy
김민석
Minseok Kim
CEO21.0K₩1,017+5.3%₩21M ($15K)
2026-04-01BUYMarket Buy
김민석
Minseok Kim
CEO34.0K₩1,042+2.8%₩35M ($25K)
2026-03-31BUYMarket Buy
김민석
Minseok Kim
CEO23.3K₩1,049+2.1%₩24M ($17K)
2026-03-30BUYMarket Buy
김민석
Minseok Kim
CEO15.8K₩1,026+4.4%₩16M ($11K)
2026-03-25BUYMarket Buy
김민석
Minseok Kim
CEO12.2K₩1,012+5.8%₩12M ($9K)
2026-03-24BUYMarket Buy
김민석
Minseok Kim
CEO14.1K₩1,021+4.9%₩14M ($10K)
2026-03-23BUYMarket Buy
김민석
Minseok Kim
CEO15.0K₩1,022+4.8%₩15M ($11K)
2026-03-19BUYMarket Buy
김민석
Minseok Kim
CEO16.0K₩1,017+5.3%₩16M ($11K)
2026-03-06BUYMarket Buy
김정우
Kim Jeong-woo
CEO39.2K---
2026-03-05BUYMarket Buy
김정우
Kim Jeong-woo
CEO20.8K---
2024-07-09BUYMarket Buy
김정우
Kim Jeong-woo
CEO20.0K₩1,396-27.3%₩28M ($19K)
2024-07-08BUYMarket Buy
김정우
Kim Jeong-woo
CEO17.0K₩1,405-27.8%₩24M ($17K)
2024-07-05BUYMarket Buy
김정우
Kim Jeong-woo
CEO13.0K₩1,410-28.0%₩18M ($13K)
2024-07-04BUYMarket Buy
김정우
Kim Jeong-woo
CEO30.0K₩1,389-26.9%₩42M ($29K)
2024-04-25BUYMarket Buy
김민석
Minseok Kim
CEO34.5K₩1,434-29.2%₩50M ($34K)
2024-04-23BUYMarket Buy
김민석
Minseok Kim
CEO38.2K₩1,440-29.5%₩55M ($38K)
2024-04-18BUYMarket Buy
김민석
Minseok Kim
CEO30.0K₩1,493-32.0%₩45M ($31K)
2024-04-17BUYMarket Buy
김민석
Minseok Kim
CEO17.5K₩1,498-32.2%₩26M ($18K)
2024-04-16BUYMarket Buy
김민석
Minseok Kim
CEO15.7K₩1,486-31.7%₩23M ($16K)
2024-04-15BUYMarket Buy
김민석
Minseok Kim
CEO6.2K₩1,489-31.8%₩9M ($6K)
2024-04-12BUYMarket Buy
김민석
Minseok Kim
CEO10.0K₩1,515-33.0%₩15M ($11K)
2024-04-11BUYMarket Buy
김민석
Minseok Kim
CEO7.0K₩1,530-33.7%₩11M ($7K)
2024-04-09BUYMarket Buy
김민석
Minseok Kim
CEO23.3K₩1,541-34.1%₩36M ($25K)
2024-04-08BUYMarket Buy
김민석
Minseok Kim
CEO10.3K₩1,541-34.1%₩16M ($11K)

Frequently asked questions

Who has been buying Osstem stock?
2 distinct insiders have filed 27 disclosed insider purchases in Osstem (031510), most recently on 2026-06-29. 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 Osstem have?
Osstem has 27 buy-side and 0 sell-side disclosures on record, covering ₩553M ($384K) in total reported value, spanning 2024-04-08 to 2026-06-29.
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.