Who has been buying Optrontech stock?

4 distinct insiders have filed 16 disclosed insider purchases in Optrontech (082210), most recently on 2026-07-16. 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 Optrontech have?

Optrontech has 16 buy-side and 0 sell-side disclosures on record, covering ₩156M ($108K) in total reported value, spanning 2024-09-13 to 2026-07-16.

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.

Optrontech 082210

Company

옵트론텍Optrontech

Insiders

Buys

Total Value

₩156M ($108K)

Avg Return

+34.03%

Last Filing

2026-07-16

Optrontech (082210) has 16 disclosed insider purchases and 0 disclosed disposals on record, filed by 4 distinct insiders. Together those filings cover ₩156M ($108K) in reported transaction value. The earliest filing StockDrifts holds for Optrontech is dated 2024-09-13; the most recent is 2026-07-16. Across these filings the average return since disclosure is +34.03%, 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
2026-07-20	BUY	신규선임	홍창일 Hong Chang-il	Planning Director	348.8K	₩1,885	+13.3%	₩658M ($457K)
2026-07-16	BUY	Market Buy	정대현 Daehyun Jeong	president	24.7K	₩1,921	+0.0%	₩47M ($32K)
2026-07-15	BUY	Market Buy	정대현 Daehyun Jeong	president	68	₩1,976	-2.8%	₩106K ($74)
2026-07-14	BUY	Market Buy	정대현 Daehyun Jeong	president	217	₩1,950	-1.5%	₩342K ($237)
2026-07-13	BUY	Market Buy	정대현 Daehyun Jeong	president	25.0K	₩1,944	-1.2%	₩44M ($31K)
2026-06-29	BUY	Market Buy	CHOI SANG HO	CEO	2.0K	-	-	-
2026-06-26	BUY	Market Buy	CHOISANGHO,CORP.	-	67.0K	-	-	-
2026-06-26	BUY	Market Buy	CHOI SANG HO	CEO	21.6K	-	-	-
2026-06-25	BUY	Market Buy	CHOI SANG HO	CEO	48.9K	-	-	-
2026-06-24	BUY	Market Buy	CHOI SANG HO	CEO	5.6K	-	-	-
2026-06-11	BUY	Market Buy	CHOISANGHO,CORP.	-	67.0K	-	-	-
2026-06-09	BUY	Market Buy	CHOISANGHO,CORP.	-	62.0K	-	-	-
2026-06-08	BUY	Market Buy	CHOISANGHO,CORP.	-	55.0K	-	-	-
2026-05-29	BUY	CB인수	CHOISANGHO,CORP.	-	5.2M	-	-	-
2025-04-28	BUY	Market Buy	정대현 Daehyun Jeong	president	15.0K	₩1,720	+40.7%	₩26M ($18K)
2025-04-07	BUY	Market Buy	정대현 Daehyun Jeong	president	5.0K	₩1,161	+108.4%	₩6M ($4K)
2025-03-31	BUY	Market Buy	정대현 Daehyun Jeong	president	20.0K	₩1,110	+118.0%	₩22M ($15K)
2024-09-13	BUY	Market Buy	김동준 Dongjun Kim	moving	4.8K	₩2,190	+10.5%	₩11M ($7K)

Frequently asked questions

Who has been buying Optrontech stock?: 4 distinct insiders have filed 16 disclosed insider purchases in Optrontech (082210), most recently on 2026-07-16. 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 Optrontech have?: Optrontech has 16 buy-side and 0 sell-side disclosures on record, covering ₩156M ($108K) in total reported value, spanning 2024-09-13 to 2026-07-16.
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.