Who has been buying Opticore stock?

3 distinct insiders have filed 1 disclosed insider purchases in Opticore (380540), most recently on 2026-05-07. 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 Opticore have?

Opticore has 1 buy-side and 23 sell-side disclosures on record, covering ₩5.1B ($3.5M) in total reported value, spanning 2024-05-10 to 2026-05-07.

Where does StockDrifts get Opticore 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.

Opticore 380540

Company

옵티코어Opticore

Insiders

Buys

Total Value

₩5.1B ($3.5M)

Avg Return

-101.19%

Last Filing

2026-05-07

Opticore (380540) has 1 disclosed insider purchases and 23 disclosed disposals on record, filed by 3 distinct insiders. Together those filings cover ₩5.1B ($3.5M) in reported transaction value. The earliest filing StockDrifts holds for Opticore is dated 2024-05-10; the most recent is 2026-05-07. All of it is parsed from DART D001/D002 insider disclosures, the official disclosure system operated by the Financial Supervisory Service (Korea).

Price & insider activity (12 months)

Recent insider trades

Date	Type	Source	Insider	Position	Shares	Price at filing	Return	Value
2026-05-07	SELL	주식병합	김정훈 Kim Jeong-hoon	vice president	-110.0K	₩4,225	+0.0%	₩465M ($323K)
2026-05-07	SELL	주식병합	블랙마운틴홀딩스 Black Mountain Holdings	-	-4.4M	₩4,225	+0.0%	₩18.5B ($12.8M)
2026-05-07	SELL	주식병합	김도훈 Kim Do-hoon	moving	-10.0K	₩4,225	+0.0%	₩42M ($29K)
2026-05-07	SELL	주식병합	박경수 Park Kyung-soo	moving	-278.8K	₩4,225	+0.0%	₩1.2B ($818K)
2026-05-07	SELL	주식병합	김진환 Jinhwan Kim	moving	-125.0K	₩4,225	+0.0%	₩528M ($367K)
2026-04-01	BUY	신규선임	김정훈 Kim Jeong-hoon	vice president	220.0K	₩4,225	+0.0%	₩930M ($645K)
2026-01-23	BUY	Market Buy	박경수 Park Kyung-soo	moving	6.0K	₩3,570	+1.7%	₩21M ($15K)
2026-01-23	SELL	Market Sell	박경수 Park Kyung-soo	moving	-55.6K	₩3,570	-1.7%	₩198M ($138K)
2026-01-22	SELL	Market Sell	김도훈 Kim Do-hoon	moving	-80.0K	₩4,290	+15.4%	₩343M ($238K)
2026-01-22	SELL	Market Sell	박경수 Park Kyung-soo	moving	-30.0K	₩4,290	+15.4%	₩129M ($89K)
2026-01-21	SELL	Market Sell	김도훈 Kim Do-hoon	moving	-30.0K	₩4,850	+25.1%	₩146M ($101K)
2026-01-20	SELL	Market Sell	김진환 Jinhwan Kim	moving	-350.0K	₩4,740	+23.4%	₩1.7B ($1.2M)
2026-01-20	SELL	Market Sell	김도훈 Kim Do-hoon	moving	-120.0K	₩4,740	+23.4%	₩569M ($395K)
2026-01-20	SELL	Market Sell	박경수 Park Kyung-soo	moving	-177.4K	₩4,740	+23.4%	₩841M ($584K)
2025-07-09	SELL	시간외매매	진재현 Jaehyun Jin	CEO	-3.0M	₩1,820	-99.5%	₩5.5B ($3.8M)
2025-07-09	SELL	장외매도	진재현 Jaehyun Jin	CEO	-6.6M	₩1,820	-99.5%	₩12.1B ($8.4M)
2025-06-09	BUY	주식매수선택권	김진환 Jinhwan Kim	moving	40.0K	₩1,783	+103.6%	₩71M ($50K)
2025-05-13	BUY	주식매수선택권	김진환 Jinhwan Kim	moving	80.0K	₩1,760	+106.3%	₩141M ($98K)
2025-05-08	SELL	Market Sell	박경수 Park Kyung-soo	moving	-38.0K	₩2,200	-65.0%	₩84M ($58K)
2025-05-07	SELL	Market Sell	박경수 Park Kyung-soo	moving	-10.0K	₩2,100	-72.9%	₩21M ($15K)
2025-05-02	SELL	Market Sell	박경수 Park Kyung-soo	moving	-37.5K	₩2,400	-51.3%	₩90M ($62K)
2025-03-12	BUY	제3자배정유상증자	블랙마운틴홀딩스 Black Mountain Holdings	-	8.7M	-	-	-
2025-01-17	SELL	Market Sell	김도훈 Kim Do-hoon	moving	-97.7K	₩1,248	-190.9%	₩122M ($85K)
2025-01-16	SELL	Market Sell	김도훈 Kim Do-hoon	moving	-92.2K	₩1,255	-189.2%	₩116M ($80K)
2025-01-09	SELL	Market Sell	김도훈 Kim Do-hoon	moving	-70.0K	₩1,326	-173.8%	₩93M ($64K)
2025-01-08	SELL	Market Sell	김도훈 Kim Do-hoon	moving	-85.0K	₩1,340	-170.9%	₩114M ($79K)
2024-12-30	SELL	Market Sell	김도훈 Kim Do-hoon	moving	-21.0K	₩1,288	-181.8%	₩27M ($19K)
2024-12-27	SELL	Market Sell	김도훈 Kim Do-hoon	moving	-40.0K	₩1,292	-181.0%	₩52M ($36K)
2024-12-26	SELL	Market Sell	김도훈 Kim Do-hoon	moving	-34.0K	₩1,335	-171.9%	₩45M ($32K)
2024-12-24	SELL	Market Sell	김도훈 Kim Do-hoon	moving	-20.0K	₩1,289	-181.6%	₩26M ($18K)
2024-11-20	SELL	Market Sell	김도훈 Kim Do-hoon	moving	-20.0K	₩1,365	-165.9%	₩27M ($19K)
2024-11-19	SELL	Market Sell	김도훈 Kim Do-hoon	moving	-150.0K	₩1,400	-159.3%	₩210M ($146K)
2024-11-14	SELL	Market Sell	김도훈 Kim Do-hoon	moving	-20.0K	₩1,289	-181.6%	₩26M ($18K)
2024-11-12	SELL	Market Sell	김도훈 Kim Do-hoon	moving	-50.0K	₩1,263	-187.4%	₩63M ($44K)
2024-08-05	SELL	Market Sell	김도훈 Kim Do-hoon	moving	-50.0K	₩1,099	-230.3%	₩55M ($38K)
2024-06-17	BUY	주식매수선택권	김정훈 Kim Jeong-hoon	vice president	300.0K	₩1,214	+199.0%	₩364M ($253K)
2024-05-10	BUY	주식매수선택권	김진환 Jinhwan Kim	moving	120.0K	₩1,297	+179.9%	₩156M ($108K)

Frequently asked questions

Who has been buying Opticore stock?: 3 distinct insiders have filed 1 disclosed insider purchases in Opticore (380540), most recently on 2026-05-07. 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 Opticore have?: Opticore has 1 buy-side and 23 sell-side disclosures on record, covering ₩5.1B ($3.5M) in total reported value, spanning 2024-05-10 to 2026-05-07.
Where does StockDrifts get Opticore 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 Opticore. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.