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Sansei Co.,Ltd. 6307

Company
サンセイ株式会社Sansei Co.,Ltd.
Investors
3
Buys
5
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. All of it is parsed from EDINET large-shareholding (5%+) reports, the official disclosure system operated by the Financial Services Agency (Japan). 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

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2025-05-13BUYMarket Buy
株式会社光通信
HIKARI TSUSHIN, Inc.
passive1.5M¥393+37.7%¥605M ($3.9M)
2025-05-13BUYMarket Buy
光通信株式会社
Hikari Tsushin K.K.
passive392.8K¥393+37.7%¥35M ($228K)
2025-03-18BUYMarket Buy
株式会社光通信
HIKARI TSUSHIN, Inc.
passive1.5M¥394+37.3%¥606M ($3.9M)
2025-03-18BUYMarket Buy
光通信株式会社
Hikari Tsushin K.K.
passive302.9K¥394+37.3%¥35M ($228K)
2024-09-19BUYMarket Buy
株式会社光通信
HIKARI TSUSHIN, Inc.
passive1.5M¥384+40.9%¥591M ($3.8M)
2024-09-19BUYMarket Buy
光通信株式会社
Hikari Tsushin K.K.
passive213.0K¥384+40.9%¥35M ($225K)
2024-05-27BUYMarket Buy
株式会社光通信
HIKARI TSUSHIN, Inc.
passive1.5M¥408+32.6%¥628M ($4.0M)
2024-05-27BUYMarket Buy
光通信株式会社
Hikari Tsushin K.K.
passive122.1K¥408+32.6%¥37M ($239K)
2024-01-18BUYMarket Buy
光通信株式会社
Hikari Tsushin K.K.
passive31.9K¥385+40.5%¥12M ($79K)
2024-01-18BUYMarket Buy
株式会社光通信
HIKARI TSUSHIN, Inc.
passive1.5M¥385+40.5%¥22M ($145K)
2022-12-07SELLunknown
エフエムアール エルエルシー(FMR LLC)
FMR LLC
other359.7K¥317-70.7%¥29M ($189K)
2022-11-22SELLunknown
エフエムアール エルエルシー(FMR LLC)
FMR LLC
other452.3K¥321-68.5%¥36M ($233K)
2022-10-21SELLunknown
エフエムアール エルエルシー(FMR LLC)
FMR LLC
other564.6K¥322-68.0%¥34M ($217K)
2022-09-26SELLunknown
エフエムアール エルエルシー(FMR LLC)
FMR LLC
other668.4K¥345-56.8%¥34M ($218K)
2022-08-22SELLunknown
エフエムアール エルエルシー(FMR LLC)
FMR LLC
other767.0K¥368-47.0%¥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.
Where does StockDrifts get Sansei Co.,Ltd. insider data?
From EDINET large-shareholding (5%+) reports — the official filing system run by the Financial Services Agency (Japan). StockDrifts parses each disclosure and matches it to daily price history; the original filings remain available directly from EDINET.
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.

Source filings

Every trade listed above is disclosed in EDINET large-shareholding (5%+) reports, filed with the Financial Services Agency (Japan). View the original EDINET filings for Sansei Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.