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Koken Ltd. 7963

Company
興研株式会社Koken Ltd.
Investors
8
Buys
2
Total Value
¥144M ($929K)
Avg Return
+12.74%
Last Filing
2025-04-22

Koken Ltd. (7963) has 2 disclosed large-shareholding filings and 1 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥144M ($929K) in reported transaction value. The earliest filing StockDrifts holds for Koken Ltd. is dated 2021-12-07; the most recent is 2025-04-22. Across these filings the average return since disclosure is +12.74%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2025-04-22BUYMarket Buy
株式会社みずほ銀行
Mizuho Bank, Ltd.
strategic227.9K¥1,607--
2025-04-22BUYMarket Buy
みずほ信託銀行株式会社
Mizuho Trust & Banking Co., Ltd.
other116.9K¥1,607+11.5%¥96M ($619K)
2022-05-13BUYunknown
酒井 眞一
masakazu sakai
other591.0K¥1,723--
2022-05-13BUYunknown
酒井 和子
Kazuko Sakai
strategic56.0K¥1,723--
2022-05-13BUYunknown
酒井 宏之
Hiroyuki Sakai
other559.4K¥1,723--
2022-05-13BUYunknown
公益財団法人酒井CHS振興財団
Sakai CHS Promotion Foundation
other600.0K¥1,723--
2022-05-13SELLunknown
酒井建物株式会社
Sakai Tatemono Co., Ltd.
strategic60¥1,723-4.0%¥114M ($738K)
2022-05-13BUYunknown
酒井 啓子
Keiko Sakai
strategic59.6K¥1,723--
2021-12-07BUYunknown
株式会社みずほ銀行
Mizuho Bank, Ltd.
strategic227.9K¥1,848--
2021-12-07BUYunknown
みずほ信託銀行株式会社
Mizuho Trust & Banking Co., Ltd.
other57.0K¥1,848-3.0%¥48M ($310K)

Frequently asked questions

Who has been buying Koken Ltd. stock?
8 distinct investors have filed 2 disclosed large-shareholding filings in Koken Ltd. (7963), most recently on 2025-04-22. 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 Koken Ltd. have?
Koken Ltd. has 2 buy-side and 1 sell-side disclosures on record, covering ¥144M ($929K) in total reported value, spanning 2021-12-07 to 2025-04-22.
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.