Who has been buying Laser Optech stock?

7 distinct insiders have filed 1 disclosed insider purchases in Laser Optech (199550), most recently on 2026-04-17. 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 Laser Optech have?

Laser Optech has 1 buy-side and 28 sell-side disclosures on record, covering ₩6.1B ($4.3M) in total reported value, spanning 2024-02-01 to 2026-04-17.

Where does StockDrifts get Laser Optech 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.

Laser Optech 199550

Company

레이저옵텍Laser Optech

Insiders

Buys

Total Value

₩6.1B ($4.3M)

Avg Return

+16.27%

Last Filing

2026-04-17

Laser Optech (199550) has 1 disclosed insider purchases and 28 disclosed disposals on record, filed by 7 distinct insiders. Together those filings cover ₩6.1B ($4.3M) in reported transaction value. The earliest filing StockDrifts holds for Laser Optech is dated 2024-02-01; the most recent is 2026-04-17. 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 +16.27%, 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
2026-04-17	BUY	유상신주취득	이창진 Changjin Lee	CEO	77.2K	₩5,670	-0.5%	₩437M ($304K)
2026-04-17	BUY	유상신주취득	주홍 scarlet	CEO	49.7K	₩5,670	-0.5%	₩282M ($196K)
2026-04-17	BUY	유상신주취득	정지호 Jeong Ji-ho	moving	22	₩5,670	-0.5%	₩125K ($87)
2026-04-17	SELL	기타	주홍 scarlet	CEO	-45.9K	₩5,670	+0.5%	₩260M ($181K)
2026-04-17	SELL	기타	이창진 Changjin Lee	CEO	-77.2K	₩5,670	+0.5%	₩437M ($304K)
2026-04-17	SELL	기타	이주연 Jooyeon Lee	Managing Director	-8.2K	₩5,670	+0.5%	₩47M ($32K)
2026-04-17	SELL	기타	정지호 Jeong Ji-ho	moving	-21	₩5,670	+0.5%	₩119K ($83)
2026-04-17	BUY	유상신주취득	이주연 Jooyeon Lee	Managing Director	8.6K	₩5,670	-0.5%	₩49M ($34K)
2026-04-01	SELL	Market Sell	원익뉴그로쓰2018사모투자 Wonik New Growth 2018 Private Investment	Other non-executive directors	-78.5K	₩5,460	+0.6%	₩429M ($298K)
2026-03-31	SELL	Market Sell	원익뉴그로쓰2018사모투자 Wonik New Growth 2018 Private Investment	Other non-executive directors	-80.0K	₩5,350	-1.5%	₩428M ($297K)
2026-03-30	SELL	Market Sell	이창진 Changjin Lee	CEO	-18.6K	₩5,670	+0.5%	₩106M ($73K)
2026-03-30	SELL	Market Sell	원익뉴그로쓰2018사모투자 Wonik New Growth 2018 Private Investment	Other non-executive directors	-43.7K	₩5,670	+4.2%	₩248M ($172K)
2026-03-27	SELL	Market Sell	이창진 Changjin Lee	CEO	-7.1K	₩5,690	+0.0%	₩40M ($28K)
2026-03-27	SELL	Market Sell	원익뉴그로쓰2018사모투자 Wonik New Growth 2018 Private Investment	Other non-executive directors	-60.0K	₩5,690	+4.6%	₩341M ($237K)
2026-03-26	SELL	Market Sell	원익뉴그로쓰2018사모투자 Wonik New Growth 2018 Private Investment	Other non-executive directors	-70.0K	₩5,670	+4.2%	₩397M ($276K)
2026-03-26	SELL	Market Sell	김원술 Kim Won-sul	moving	-5.3K	₩5,670	-0.3%	₩30M ($21K)
2026-03-26	SELL	Market Sell	김규태 Kim Gyu-tae	moving	-3.5K	₩5,670	-0.3%	₩20M ($14K)
2026-03-23	SELL	장외매도	주홍 scarlet	CEO	-413.3K	₩5,840	+2.6%	₩2.4B ($1.7M)
2026-03-18	BUY	기타	원익뉴그로쓰2018사모투자 Wonik New Growth 2018 Private Investment	Other non-executive directors	75.8K	₩6,690	-18.8%	₩507M ($352K)
2026-03-17	BUY	기타	원익뉴그로쓰2018사모투자 Wonik New Growth 2018 Private Investment	Other non-executive directors	256.4K	₩5,150	+5.4%	₩1.3B ($917K)
2026-03-17	BUY	기타	김규태 Kim Gyu-tae	moving	3.5K	₩5,150	+10.5%	₩18M ($13K)
2026-03-17	BUY	기타	이창진 Changjin Lee	CEO	102.9K	₩5,150	+10.5%	₩530M ($368K)
2026-03-17	BUY	기타	주홍 scarlet	CEO	459.2K	₩5,150	+10.5%	₩2.4B ($1.6M)
2026-03-17	BUY	기타	김원술 Kim Won-sul	moving	5.3K	₩5,150	+10.5%	₩27M ($19K)
2026-03-17	BUY	기타	이주연 Jooyeon Lee	Managing Director	8.2K	₩5,150	+7.0%	₩42M ($29K)
2026-03-17	BUY	기타	정지호 Jeong Ji-ho	moving	21	₩5,150	+7.0%	₩108K ($75)
2025-06-24	SELL	Market Sell	김원술 Kim Won-sul	moving	-5.0K	₩7,884	+24.8%	₩39M ($27K)
2025-05-30	BUY	주식매수선택권	이창진 Changjin Lee	CEO	21.0K	₩7,526	-21.2%	₩158M ($110K)
2025-05-30	BUY	주식매수선택권	이창진 Changjin Lee	CEO	200.0K	₩7,526	-21.2%	₩1.5B ($1.0M)
2025-05-28	SELL	Market Sell	이창진 Changjin Lee	CEO	-36.3K	₩7,563	+21.6%	₩275M ($191K)
2025-05-27	SELL	Market Sell	이창진 Changjin Lee	CEO	-10.0K	₩7,413	+20.0%	₩74M ($51K)
2025-05-26	SELL	Market Sell	이창진 Changjin Lee	CEO	-11.4K	₩7,554	+21.5%	₩86M ($60K)
2025-05-23	SELL	Market Sell	이창진 Changjin Lee	CEO	-22.2K	₩7,431	+20.2%	₩165M ($115K)
2025-03-04	SELL	Market Sell	유연성 pliability	Managing Director	-11.0K	₩8,863	+33.1%	₩97M ($68K)
2025-02-14	SELL	Market Sell	김원술 Kim Won-sul	Managing Director	-1.0K	₩7,639	+22.4%	₩8M ($5K)
2025-02-13	SELL	Market Sell	유연성 pliability	Managing Director	-16.0K	₩8,072	+26.5%	₩129M ($90K)
2025-01-01	BUY	신규선임	김규태 Kim Gyu-tae	moving	16.7K	₩5,274	+12.4%	₩88M ($61K)
2024-12-23	SELL	Market Sell	김원술 Kim Won-sul	Managing Director	-1.0K	₩5,029	-17.9%	₩5M ($3K)
2024-12-10	BUY	Market Buy	정지호 Jeong Ji-ho	moving	100	₩4,832	+22.7%	₩483K ($336)
2024-11-08	SELL	Market Sell	김원술 Kim Won-sul	Managing Director	-500	₩6,075	+2.4%	₩3M ($2K)
2024-10-14	SELL	Market Sell	김원술 Kim Won-sul	Managing Director	-500	₩6,650	+10.8%	₩3M ($2K)
2024-10-10	BUY	주식매수청구권 행사	이주연 Jooyeon Lee	Managing Director	21.0K	₩6,951	-14.7%	₩146M ($101K)
2024-10-04	SELL	Market Sell	김원술 Kim Won-sul	Managing Director	-3.0K	₩7,366	+19.5%	₩22M ($15K)
2024-09-13	SELL	Market Sell	김원술 Kim Won-sul	Managing Director	-1.0K	₩7,347	+19.3%	₩7M ($5K)
2024-09-03	SELL	Market Sell	김원술 Kim Won-sul	Managing Director	-2.0K	₩8,063	+26.4%	₩16M ($11K)
2024-08-05	SELL	Market Sell	조주원 Jo Joo-won	Managing Director	-40.0K	₩7,102	+16.5%	₩284M ($197K)
2024-08-05	SELL	Market Sell	유연성 pliability	Managing Director	-12.0K	₩7,102	+16.5%	₩85M ($59K)
2024-06-13	BUY	주식매수선택권	이창진 Changjin Lee	CEO	100.0K	₩9,287	-36.1%	₩929M ($645K)
2024-04-11	BUY	주식매수청구권 행사	이주연 Jooyeon Lee	Managing Director	18.0K	₩7,968	-25.6%	₩143M ($100K)
2024-04-11	BUY	주식매수청구권 행사	조주원 Jo Joo-won	Managing Director	45.0K	₩7,968	-25.6%	₩359M ($249K)

Showing the 50 most recent of 56 filings.

Frequently asked questions

Who has been buying Laser Optech stock?: 7 distinct insiders have filed 1 disclosed insider purchases in Laser Optech (199550), most recently on 2026-04-17. 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 Laser Optech have?: Laser Optech has 1 buy-side and 28 sell-side disclosures on record, covering ₩6.1B ($4.3M) in total reported value, spanning 2024-02-01 to 2026-04-17.
Where does StockDrifts get Laser Optech 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 Laser Optech. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.