Who has been buying Cymax stock?

2 distinct insiders have filed 8 disclosed insider purchases in Cymax (160980), most recently on 2026-03-18. 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 Cymax have?

Cymax has 8 buy-side and 3 sell-side disclosures on record, covering ₩1.3B ($883K) in total reported value, spanning 2024-03-15 to 2026-03-18.

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.

Cymax 160980

Company

싸이맥스Cymax

Insiders

Buys

Total Value

₩1.3B ($883K)

Avg Return

+113.27%

Last Filing

2026-03-18

Cymax (160980) has 8 disclosed insider purchases and 3 disclosed disposals on record, filed by 2 distinct insiders. Together those filings cover ₩1.3B ($883K) in reported transaction value. The earliest filing StockDrifts holds for Cymax is dated 2024-03-15; the most recent is 2026-03-18. Across these filings the average return since disclosure is +113.27%, 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
2026-03-18	BUY	상속	정혜은 Jeong Hye-eun	CEO	532.9K	-	-	-
2026-03-18	SELL	피상속	정구용 Jeong Gu-yong	Former) CEO and Chairman	-532.9K	-	-	-
2025-08-19	BUY	시간외매매	인지컨트롤스 Cognitive Controls	-	703.8K	₩12,260	+67.2%	₩8.6B ($6.0M)
2024-12-11	BUY	Market Buy	정혜은 Jeong Hye-eun	CEO	22.2K	₩7,840	+161.5%	₩174M ($121K)
2024-12-10	BUY	Market Buy	정혜은 Jeong Hye-eun	CEO	35.9K	₩7,730	+165.2%	₩278M ($193K)
2024-12-09	BUY	Market Buy	정혜은 Jeong Hye-eun	CEO	378	₩7,500	+173.3%	₩3M ($2K)
2024-12-06	BUY	Market Buy	정혜은 Jeong Hye-eun	CEO	11.8K	₩8,000	+156.3%	₩94M ($65K)
2024-12-05	BUY	Market Buy	정혜은 Jeong Hye-eun	CEO	5.7K	₩8,040	+155.0%	₩46M ($32K)
2024-12-04	BUY	Market Buy	정혜은 Jeong Hye-eun	CEO	14.1K	₩8,020	+155.6%	₩113M ($79K)
2024-12-03	BUY	Market Buy	정혜은 Jeong Hye-eun	CEO	5.8K	₩8,040	+155.0%	₩46M ($32K)
2024-11-28	BUY	Market Buy	정혜은 Jeong Hye-eun	CEO	162	₩8,480	+141.8%	₩1M ($954)
2024-03-19	SELL	Market Sell	전인택 Jeon In-taek	Chief Medical Officer	-8.6K	₩19,300	-6.2%	₩166M ($115K)
2024-03-18	SELL	Market Sell	전인택 Jeon In-taek	Chief Medical Officer	-8.9K	₩19,300	-6.2%	₩172M ($119K)
2024-03-15	SELL	Market Sell	전인택 Jeon In-taek	Chief Medical Officer	-9.2K	₩19,490	-5.2%	₩179M ($124K)

Frequently asked questions

Who has been buying Cymax stock?: 2 distinct insiders have filed 8 disclosed insider purchases in Cymax (160980), most recently on 2026-03-18. 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 Cymax have?: Cymax has 8 buy-side and 3 sell-side disclosures on record, covering ₩1.3B ($883K) in total reported value, spanning 2024-03-15 to 2026-03-18.
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.