Who has been buying Qualitas Semiconductor stock?

8 distinct insiders have filed 4 disclosed insider purchases in Qualitas Semiconductor (432720), 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 Qualitas Semiconductor have?

Qualitas Semiconductor has 4 buy-side and 35 sell-side disclosures on record, covering ₩12.2B ($8.5M) in total reported value, spanning 2024-03-01 to 2026-05-07.

Where does StockDrifts get Qualitas Semiconductor 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.

Qualitas Semiconductor 432720

Company

퀄리타스반도체Qualitas Semiconductor

Insiders

Buys

Total Value

₩12.2B ($8.5M)

Avg Return

+14.17%

Last Filing

2026-05-07

Qualitas Semiconductor (432720) has 4 disclosed insider purchases and 35 disclosed disposals on record, filed by 8 distinct insiders. Together those filings cover ₩12.2B ($8.5M) in reported transaction value. The earliest filing StockDrifts holds for Qualitas Semiconductor is dated 2024-03-01; 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). Across these filings the average return since disclosure is +14.17%, 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
2026-05-07	SELL	Market Sell	김두호 Kim Doo-ho	CEO	-34.3K	₩26,350	+25.2%	₩903M ($627K)
2026-05-07	SELL	Market Sell	최광천 Gwangcheon Choi	Managing Director	-20.0K	₩26,350	+25.2%	₩527M ($366K)
2026-05-06	SELL	Market Sell	최광천 Gwangcheon Choi	Managing Director	-34.6K	₩28,000	+29.6%	₩968M ($672K)
2026-04-20	BUY	주식매수선택권	경일현 Gyeongil-hyeon	Managing Director	10.8K	₩18,390	+9.8%	₩199M ($138K)
2026-04-17	SELL	Market Sell	박용현 Yonghyun Park	moving	-5.0K	₩19,100	-5.8%	₩96M ($66K)
2026-04-16	SELL	Market Sell	한평수 One pyeongsu	Managing Director	-237.9K	₩19,310	+0.7%	₩4.6B ($3.2M)
2026-04-16	SELL	Market Sell	이종성 Lee Jong-seong	moving	-20.0K	₩19,310	+0.7%	₩386M ($268K)
2026-04-16	SELL	Market Sell	경일현 Gyeongil-hyeon	Managing Director	-9.0K	₩19,310	+0.7%	₩174M ($121K)
2026-04-16	SELL	Market Sell	성창경 Seong Chang-kyung	Managing Director	-30.1K	₩19,310	+0.7%	₩582M ($404K)
2026-04-15	SELL	Market Sell	성창경 Seong Chang-kyung	Managing Director	-30.0K	₩21,000	+8.7%	₩630M ($438K)
2026-04-15	SELL	Market Sell	경일현 Gyeongil-hyeon	Managing Director	-2.0K	₩21,000	+8.7%	₩42M ($29K)
2026-04-15	SELL	Market Sell	한평수 One pyeongsu	Managing Director	-32.0K	₩21,000	+8.7%	₩672M ($467K)
2026-04-14	SELL	Market Sell	경일현 Gyeongil-hyeon	Managing Director	-6.0K	₩20,550	+6.7%	₩123M ($86K)
2026-04-01	BUY	신규선임	정소영 Soyoung Jeong	moving	1.0K	₩15,290	+25.4%	₩15M ($11K)
2026-04-01	BUY	신규선임	김태진 Taejin Kim	moving	9.3K	₩15,290	+25.4%	₩142M ($99K)
2026-03-25	SELL	증여	이재철 Jaechul Lee	Managing Director	-8.4K	₩16,920	-13.3%	₩142M ($99K)
2025-12-26	BUY	Market Buy	경일현 Gyeongil-hyeon	Managing Director	130	₩13,770	-7.8%	₩2M ($1K)
2025-12-23	SELL	Market Sell	경일현 Gyeongil-hyeon	Managing Director	-4.0K	₩13,550	+6.3%	₩54M ($38K)
2025-12-15	SELL	Market Sell	박용현 Yonghyun Park	moving	-1.2K	₩13,690	+7.2%	₩16M ($11K)
2025-12-12	SELL	Market Sell	박용현 Yonghyun Park	moving	-3.9K	₩13,180	+3.6%	₩52M ($36K)
2025-12-11	SELL	Market Sell	박용현 Yonghyun Park	moving	-4.0K	₩13,420	+5.4%	₩54M ($37K)
2025-12-10	SELL	Market Sell	박용현 Yonghyun Park	moving	-2.8K	₩13,680	+7.2%	₩38M ($27K)
2025-12-03	SELL	Market Sell	김두호 Kim Doo-ho	CEO	-10.0K	₩14,690	+13.6%	₩147M ($102K)
2025-11-14	SELL	Market Sell	박용현 Yonghyun Park	moving	-5.5K	₩15,240	+16.7%	₩84M ($58K)
2025-11-13	SELL	Market Sell	박용현 Yonghyun Park	moving	-2.0K	₩16,150	+21.4%	₩32M ($22K)
2025-11-12	SELL	Market Sell	박용현 Yonghyun Park	moving	-3.0K	₩15,800	+19.6%	₩47M ($33K)
2025-11-11	SELL	Market Sell	박용현 Yonghyun Park	moving	-1.2K	₩15,290	+16.9%	₩18M ($13K)
2025-11-10	SELL	Market Sell	박용현 Yonghyun Park	moving	-2.0K	₩15,410	+17.6%	₩31M ($21K)
2025-11-05	SELL	Market Sell	경일현 Gyeongil-hyeon	Managing Director	-5.0K	₩16,010	+20.7%	₩80M ($56K)
2025-10-31	SELL	Market Sell	박용현 Yonghyun Park	moving	-3.7K	₩16,620	+23.6%	₩62M ($43K)
2025-10-31	SELL	Market Sell	최광천 Gwangcheon Choi	Managing Director	-28.6K	₩16,620	+23.6%	₩475M ($330K)
2025-10-31	SELL	Market Sell	경일현 Gyeongil-hyeon	Managing Director	-1.0K	₩16,620	+23.6%	₩17M ($12K)
2025-10-30	SELL	Market Sell	박용현 Yonghyun Park	moving	-4.0K	₩16,810	+24.4%	₩67M ($47K)
2025-10-30	SELL	Market Sell	최광천 Gwangcheon Choi	Managing Director	-11.4K	₩16,810	+24.4%	₩192M ($133K)
2025-10-29	BUY	Market Buy	최광천 Gwangcheon Choi	Managing Director	58	₩17,380	-26.9%	₩1M ($700)
2025-10-29	SELL	Market Sell	최광천 Gwangcheon Choi	Managing Director	-14.5K	₩17,380	+26.9%	₩252M ($175K)
2025-10-29	SELL	Market Sell	박용현 Yonghyun Park	moving	-5.5K	₩17,380	+26.9%	₩96M ($66K)
2025-10-16	SELL	Market Sell	이종성 Lee Jong-seong	moving	-2.0K	₩18,410	+31.0%	₩37M ($26K)
2025-10-15	SELL	Market Sell	이종성 Lee Jong-seong	moving	-3.0K	₩18,680	+32.0%	₩56M ($39K)
2025-07-04	BUY	주식매수선택권	이재철 Jaechul Lee	Managing Director	38.4K	₩14,650	-13.3%	₩563M ($391K)
2025-06-02	BUY	주식매수선택권	경일현 Gyeongil-hyeon	Managing Director	6.0K	₩13,820	-8.1%	₩83M ($58K)
2025-03-17	SELL	Market Sell	이재철 Jaechul Lee	Managing Director	-19.3K	₩16,560	+23.3%	₩320M ($222K)
2025-03-14	SELL	Market Sell	이재철 Jaechul Lee	Managing Director	-5.4K	₩16,490	+23.0%	₩90M ($62K)
2025-02-28	BUY	주식매수선택권	허철 Heo Cheol	moving	11.2K	₩13,320	-4.7%	₩149M ($104K)
2025-02-28	BUY	주식매수선택권	김우석 Wooseok Kim	moving	19.9K	₩13,320	-4.7%	₩265M ($184K)
2025-02-28	BUY	주식매수선택권	경일현 Gyeongil-hyeon	Managing Director	16.0K	₩13,320	-4.7%	₩213M ($148K)
2025-01-24	BUY	기타	이재철 Jaechul Lee	Managing Director	5.0K	₩13,350	-4.9%	₩67M ($46K)
2024-11-01	BUY	기타	이종성 Lee Jong-seong	moving	5.0K	₩9,510	+33.5%	₩48M ($33K)
2024-10-14	BUY	주식매수선택권	이재철 Jaechul Lee	Managing Director	40.0K	₩11,760	+8.0%	₩470M ($327K)
2024-10-14	BUY	주식매수선택권	박용현 Yonghyun Park	moving	72.8K	₩11,760	+8.0%	₩856M ($595K)

Showing the 50 most recent of 82 filings.

Frequently asked questions

Who has been buying Qualitas Semiconductor stock?: 8 distinct insiders have filed 4 disclosed insider purchases in Qualitas Semiconductor (432720), 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 Qualitas Semiconductor have?: Qualitas Semiconductor has 4 buy-side and 35 sell-side disclosures on record, covering ₩12.2B ($8.5M) in total reported value, spanning 2024-03-01 to 2026-05-07.
Where does StockDrifts get Qualitas Semiconductor 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 Qualitas Semiconductor. For how StockDrifts scores these disclosures, see the Korea insider signal tier research, or browse every Korean stock we track.