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.

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.

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. 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
2026-11-10	BUY	Market Buy	정소영 Soyoung Jeong	moving	800	₩8,370	+0.0%	₩6M ($4K)
2026-11-09	BUY	Market Buy	정소영 Soyoung Jeong	moving	200	₩7,810	+7.2%	₩2M ($1K)
2026-11-06	BUY	Market Buy	정소영 Soyoung Jeong	moving	1.0K	₩7,890	+6.1%	₩9M ($6K)
2026-11-05	BUY	Market Buy	정소영 Soyoung Jeong	moving	1.4K	₩8,100	+3.3%	₩13M ($9K)
2026-11-04	BUY	Market Buy	정소영 Soyoung Jeong	moving	650	₩9,300	-10.0%	₩6M ($4K)
2026-10-30	SELL	증여	최광천 Gwangcheon Choi	Managing Director	-40.0K	₩9,520	+3.7%	₩381M ($264K)
2026-10-30	BUY	Market Buy	경일현 Gyeongil-hyeon	Managing Director	1.1K	₩9,520	-3.7%	₩10M ($7K)
2026-10-28	BUY	Market Buy	이종성 Lee Jong-seong	moving	1.0K	₩9,710	+0.0%	₩9M ($6K)
2026-10-27	BUY	Market Buy	이종성 Lee Jong-seong	moving	380	₩9,380	+3.5%	₩3M ($2K)
2026-10-27	BUY	Market Buy	성창경 Seong Chang-kyung	Managing Director	14.0K	₩9,380	-2.2%	₩124M ($86K)
2026-10-26	BUY	Market Buy	박용현 Yonghyun Park	moving	1.2K	₩8,850	+9.7%	₩12M ($8K)
2026-10-26	BUY	Market Buy	이종성 Lee Jong-seong	moving	2.0K	₩8,850	+9.7%	₩19M ($13K)
2026-10-26	BUY	Market Buy	경일현 Gyeongil-hyeon	Managing Director	5.3K	₩8,850	+3.6%	₩50M ($35K)
2026-10-23	BUY	Market Buy	경일현 Gyeongil-hyeon	Managing Director	5.0K	₩9,080	+1.0%	₩49M ($34K)
2026-10-23	BUY	Market Buy	박용현 Yonghyun Park	moving	3.0K	₩9,080	+6.9%	₩30M ($21K)
2026-10-23	BUY	Market Buy	이종성 Lee Jong-seong	moving	338	₩9,080	+6.9%	₩3M ($2K)
2026-10-22	BUY	Market Buy	박용현 Yonghyun Park	moving	5.7K	₩9,350	+3.9%	₩56M ($39K)
2026-10-21	BUY	Market Buy	박용현 Yonghyun Park	moving	2.3K	₩9,880	-1.7%	₩23M ($16K)
2026-10-21	BUY	Market Buy	이종성 Lee Jong-seong	moving	600	₩9,880	-1.7%	₩6M ($4K)
2026-10-01	BUY	Market Buy	김수영 Sooyoung Kim	moving	1.3K	₩11,910	+5.5%	₩13M ($9K)
2026-09-30	BUY	Market Buy	김수영 Sooyoung Kim	moving	5.0K	₩11,130	+0.0%	₩53M ($37K)
2026-09-28	BUY	Market Buy	김수영 Sooyoung Kim	moving	5.0K	₩10,500	+6.0%	₩54M ($37K)
2026-09-28	BUY	기타	김수영 Sooyoung Kim	moving	1.1K	₩10,500	+6.0%	₩12M ($8K)
2026-09-23	BUY	Market Buy	김재영 Jaeyoung Kim	Managing Director	11.5K	₩10,750	+3.5%	₩124M ($86K)
2026-09-23	BUY	기타	김재영 Jaeyoung Kim	Managing Director	5.0K	₩10,750	+3.5%	₩54M ($37K)
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	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)
2026-04-16	SELL	Market Sell	이종성 Lee Jong-seong	moving	-20.0K	₩19,310	+0.7%	₩386M ($268K)
2026-04-16	SELL	Market Sell	한평수 One pyeongsu	Managing Director	-237.9K	₩19,310	+0.7%	₩4.6B ($3.2M)
2026-04-15	SELL	Market Sell	한평수 One pyeongsu	Managing Director	-32.0K	₩21,000	+8.7%	₩672M ($467K)
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	성창경 Seong Chang-kyung	Managing Director	-30.0K	₩21,000	+8.7%	₩630M ($438K)
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)

Showing the 50 most recent of 107 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.
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.