Who has been buying Sansei Co.,Ltd. stock?

3 distinct investors have filed 5 disclosed large-shareholding filings in Sansei Co.,Ltd. (6307), most recently on 2025-05-13. 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 Sansei Co.,Ltd. have?

Sansei Co.,Ltd. has 5 buy-side and 5 sell-side disclosures on record, covering ¥165M ($1.1M) in total reported value, spanning 2022-08-22 to 2025-05-13.

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.

Sansei Co.,Ltd. 6307

Company

サンセイ株式会社Sansei Co.,Ltd.

Investors

Buys

Total Value

¥165M ($1.1M)

Avg Return

+37.80%

Last Filing

2025-05-13

Sansei Co.,Ltd. (6307) has 5 disclosed large-shareholding filings and 5 disclosed disposals on record, filed by 3 distinct investors. Together those filings cover ¥165M ($1.1M) in reported transaction value. The earliest filing StockDrifts holds for Sansei Co.,Ltd. is dated 2022-08-22; the most recent is 2025-05-13. Across these filings the average return since disclosure is +37.80%, 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
2025-05-13	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	392.8K	¥393	+18.1%	¥35M ($228K)
2025-05-13	BUY	Market Buy	株式会社光通信 HIKARI TSUSHIN, Inc.	passive	1.5M	¥393	-	-
2025-03-18	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	302.9K	¥394	+17.8%	¥35M ($228K)
2025-03-18	BUY	Market Buy	株式会社光通信 HIKARI TSUSHIN, Inc.	passive	1.5M	¥394	-	-
2024-09-19	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	213.0K	¥384	+20.8%	¥35M ($225K)
2024-09-19	BUY	Market Buy	株式会社光通信 HIKARI TSUSHIN, Inc.	passive	1.5M	¥384	-	-
2024-05-27	BUY	Market Buy	株式会社光通信 HIKARI TSUSHIN, Inc.	passive	1.5M	¥408	-	-
2024-05-27	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	122.1K	¥408	+13.7%	¥37M ($239K)
2024-01-18	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	31.9K	¥385	-	¥12M ($79K)
2024-01-18	BUY	Market Buy	株式会社光通信 HIKARI TSUSHIN, Inc.	passive	1.5M	¥385	+20.5%	¥22M ($145K)
2022-12-07	SELL	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	359.7K	¥317	-46.4%	¥29M ($189K)
2022-11-22	SELL	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	452.3K	¥321	-44.5%	¥36M ($233K)
2022-10-21	SELL	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	564.6K	¥322	-44.1%	¥34M ($217K)
2022-09-26	SELL	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	668.4K	¥345	-34.5%	¥34M ($218K)
2022-08-22	SELL	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	767.0K	¥368	-26.1%	¥38M ($248K)

Frequently asked questions

Who has been buying Sansei Co.,Ltd. stock?: 3 distinct investors have filed 5 disclosed large-shareholding filings in Sansei Co.,Ltd. (6307), most recently on 2025-05-13. 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 Sansei Co.,Ltd. have?: Sansei Co.,Ltd. has 5 buy-side and 5 sell-side disclosures on record, covering ¥165M ($1.1M) in total reported value, spanning 2022-08-22 to 2025-05-13.
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.