Who has been buying Sanko Sangyo Co.,Ltd. stock?

5 distinct investors have filed 5 disclosed large-shareholding filings in Sanko Sangyo Co.,Ltd. (7922), most recently on 2026-04-28. 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 Sanko Sangyo Co.,Ltd. have?

Sanko Sangyo Co.,Ltd. has 5 buy-side and 3 sell-side disclosures on record, covering ¥4.6B ($29.5M) in total reported value, spanning 2021-06-28 to 2026-04-28.

Do insider buys in Japanese stocks predict returns?

Not uniformly. StockDrifts scored 101,000+ Japanese large-shareholding filings on fixed 12-month forward returns and found the predictive power concentrated in specific filer types and filing patterns rather than spread evenly across all disclosures.

Sanko Sangyo Co.,Ltd. 7922

Company

三光産業株式会社Sanko Sangyo Co.,Ltd.

Investors

Buys

Total Value

¥4.6B ($29.5M)

Avg Return

+28.23%

Last Filing

2026-04-28

Sanko Sangyo Co.,Ltd. (7922) has 5 disclosed large-shareholding filings and 3 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥4.6B ($29.5M) in reported transaction value. The earliest filing StockDrifts holds for Sanko Sangyo Co.,Ltd. is dated 2021-06-28; the most recent is 2026-04-28. Across these filings the average return since disclosure is +28.23%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

Date	Type	Source	Insider	Purpose	Shares	Price at filing	Return	Value
2026-04-28	SELL	unknown	株式会社エス・ワイ・エス SYS INC.	unknown	0	¥717	+0.0%	¥610M ($3.9M)
2026-04-27	BUY	unknown	株式会社バロン	activist	5.4M	¥717	-	-
2026-04-27	BUY	unknown	鮫島英子	activist	190.3K	¥717	-	-
2026-04-17	SELL	unknown	三光産業取引先持株会理事長吉田純一 Yoshida Junichi	unknown	0	¥718	+0.1%	¥337M ($2.2M)
2026-04-16	BUY	unknown	株式会社バロン BARON Co.,Ltd.	activist	5.4M	¥717	+0.0%	¥3.9B ($24.9M)
2026-04-16	BUY	unknown	株式会社バロン	activist	5.4M	¥717	+0.0%	¥3.9B ($24.9M)
2026-04-16	BUY	unknown	鮫島英子	activist	190.3K	¥717	+0.0%	¥136M ($880K)
2026-03-31	SELL	unknown	三光産業取引先持株会理事長吉田純一 Yoshida Junichi	activist	469.7K	¥768	+6.6%	¥2M ($16K)
2026-03-26	BUY	negotiated	株式会社エス・ワイ・エス SYS INC.	strategic	851.0K	¥756	-	-
2026-02-09	BUY	negotiated	株式会社エス・ワイ・エス SYS INC.	strategic	851.0K	¥765	-	-
2024-02-14	BUY	negotiated	株式会社エツミ光学 ETSUMI OPTICAL Co.,LTD.	strategic	500.0K	¥421	-	¥211M ($1.4M)
2024-02-14	BUY	negotiated	株式会社エツミ光学 ETSUMI OPTICAL Co.,LTD.	strategic	500.0K	¥421	+70.3%	¥211M ($1.4M)
2024-02-09	BUY	negotiated	株式会社エス・ワイ・エス SYS INC.	strategic	851.0K	¥423	+69.5%	¥360M ($2.3M)
2021-06-28	BUY	unknown	三光産業取引先持株会理事長吉田弘 Yoshida Hiroshi	strategic	442.8K	¥379	-	¥168M ($1.1M)

Frequently asked questions

Who has been buying Sanko Sangyo Co.,Ltd. stock?: 5 distinct investors have filed 5 disclosed large-shareholding filings in Sanko Sangyo Co.,Ltd. (7922), most recently on 2026-04-28. 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 Sanko Sangyo Co.,Ltd. have?: Sanko Sangyo Co.,Ltd. has 5 buy-side and 3 sell-side disclosures on record, covering ¥4.6B ($29.5M) in total reported value, spanning 2021-06-28 to 2026-04-28.
Do insider buys in Japanese stocks predict returns?: Not uniformly. StockDrifts scored 101,000+ Japanese large-shareholding filings on fixed 12-month forward returns and found the predictive power concentrated in specific filer types and filing patterns rather than spread evenly across all disclosures.

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.