Who has been buying 3S stock?

1 distinct insiders have filed 41 disclosed insider purchases in 3S (060310), most recently on 2026-06-30. 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 3S have?

3S has 41 buy-side and 4 sell-side disclosures on record, covering ₩15.1B ($10.5M) in total reported value, spanning 2024-11-08 to 2026-06-30.

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.

3S 060310

Company

Insiders

Buys

Total Value

₩15.1B ($10.5M)

Avg Return

-21.18%

Last Filing

2026-06-30

3S (060310) has 41 disclosed insider purchases and 4 disclosed disposals on record, filed by 1 distinct insiders. Together those filings cover ₩15.1B ($10.5M) in reported transaction value. The earliest filing StockDrifts holds for 3S is dated 2024-11-08; the most recent is 2026-06-30. Across these filings the average return since disclosure is -21.18%, 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
2026-09-03	BUY	Market Buy	정완영 Wanyoung Jeong	CEO	24.7K	₩1,120	+1.5%	₩28M ($20K)
2026-09-02	BUY	Market Buy	정완영 Wanyoung Jeong	CEO	52.7K	₩1,123	+1.3%	₩61M ($42K)
2026-09-01	BUY	Market Buy	정완영 Wanyoung Jeong	CEO	12.6K	₩1,147	-0.9%	₩14M ($10K)
2026-08-31	BUY	Market Buy	정완영 Wanyoung Jeong	CEO	60.0K	₩1,180	-3.6%	₩70M ($49K)
2026-06-30	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	72.0K	-	-	-
2026-06-29	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	104.0K	-	-	-
2026-06-26	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	160.0K	-	-	-
2026-06-25	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	271.8K	-	-	-
2026-06-24	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	73.4K	-	-	-
2026-06-23	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	40.5K	-	-	-
2026-06-22	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	66.0K	-	-	-
2026-06-19	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	37.9K	-	-	-
2026-06-18	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	19.0K	-	-	-
2026-06-17	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	781	-	-	-
2026-06-16	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	60.4K	-	-	-
2025-03-27	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	5.4M	₩2,320	-40.6%	₩12.6B ($8.8M)
2025-03-26	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	948	₩1,842	-25.1%	₩2M ($1K)
2025-03-25	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	93.7K	₩1,840	-25.1%	₩172M ($120K)
2025-03-24	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	11.1K	₩1,840	-25.1%	₩21M ($14K)
2025-03-21	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	9.5K	₩1,830	-24.6%	₩17M ($12K)
2025-03-20	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	15.6K	₩1,839	-25.0%	₩29M ($20K)
2025-03-19	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	12.7K	₩1,847	-25.3%	₩24M ($16K)
2025-03-18	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	64.9K	₩1,860	-25.9%	₩121M ($84K)
2025-03-11	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	48.4K	₩1,825	-24.4%	₩88M ($61K)
2025-02-24	SELL	Market Sell	한국웨이퍼홀딩스 Korea Wafer Holdings	-	-117.4K	₩1,979	+30.3%	₩232M ($161K)
2025-02-19	SELL	Market Sell	한국웨이퍼홀딩스 Korea Wafer Holdings	-	-40.0K	₩1,962	+29.7%	₩78M ($55K)
2025-02-10	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	3.7K	₩1,830	-24.6%	₩7M ($5K)
2025-02-07	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	14.3K	₩1,817	-24.1%	₩26M ($18K)
2025-02-06	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	47.4K	₩1,797	-23.3%	₩85M ($59K)
2025-02-04	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	56.2K	₩1,808	-23.7%	₩102M ($71K)
2025-02-03	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	123.0K	₩1,771	-22.1%	₩218M ($151K)
2025-01-22	SELL	Market Sell	한국웨이퍼홀딩스 Korea Wafer Holdings	-	-13.0K	₩1,948	+29.2%	₩25M ($18K)
2024-12-10	SELL	Market Sell	한국웨이퍼홀딩스 Korea Wafer Holdings	-	-15.0K	₩1,791	+23.0%	₩27M ($19K)
2024-12-09	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	89.1K	₩1,654	-16.6%	₩147M ($102K)
2024-12-06	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	80.2K	₩1,820	-24.2%	₩146M ($101K)
2024-12-05	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	61.8K	₩1,862	-25.9%	₩115M ($80K)
2024-12-04	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	917	₩1,890	-27.0%	₩2M ($1K)
2024-12-03	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	22.6K	₩1,945	-29.1%	₩44M ($30K)
2024-12-02	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	57.0K	₩1,951	-29.3%	₩111M ($77K)
2024-11-29	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	27.2K	₩1,982	-30.4%	₩54M ($37K)
2024-11-28	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	31.7K	₩1,996	-30.9%	₩63M ($44K)
2024-11-27	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	1.4K	₩2,005	-31.2%	₩3M ($2K)
2024-11-21	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	14.4K	₩2,020	-31.7%	₩29M ($20K)
2024-11-21	BUY	제3자배정유상증자	김세완 Sewan Kim	CEO	77.1K	₩2,020	-31.7%	₩156M ($108K)
2024-11-15	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	11.0K	₩2,015	-31.6%	₩22M ($15K)
2024-11-14	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	39.9K	₩1,979	-30.3%	₩79M ($55K)
2024-11-13	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	60.5K	₩1,988	-30.6%	₩120M ($84K)
2024-11-12	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	33.0K	₩2,040	-32.4%	₩67M ($47K)
2024-11-11	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	58.8K	₩2,120	-35.0%	₩125M ($87K)
2024-11-08	BUY	Market Buy	한국웨이퍼홀딩스 Korea Wafer Holdings	-	26.2K	₩2,185	-36.9%	₩57M ($40K)

Frequently asked questions

Who has been buying 3S stock?: 1 distinct insiders have filed 41 disclosed insider purchases in 3S (060310), most recently on 2026-06-30. 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 3S have?: 3S has 41 buy-side and 4 sell-side disclosures on record, covering ₩15.1B ($10.5M) in total reported value, spanning 2024-11-08 to 2026-06-30.
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.