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Zenken Corporation 7371

Company
全研本社株式会社Zenken Corporation
Investors
3
Buys
5
Total Value
¥4.4B ($28.1M)
Avg Return
-31.30%
Last Filing
2025-11-19

Zenken Corporation (7371) has 5 disclosed large-shareholding filings and 3 disclosed disposals on record, filed by 3 distinct investors. Together those filings cover ¥4.4B ($28.1M) in reported transaction value. The earliest filing StockDrifts holds for Zenken Corporation is dated 2021-06-23; the most recent is 2025-11-19. 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 -31.30%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2025-11-19SELLMarket Buy
吉澤 信男
Nobuo Yoshizawa
passive5.3M¥660-4.5%¥397M ($2.6M)
2023-04-20SELLunknown
株式会社IC
Ic Co., Ltd.
strategic700.0K¥689-0.1%¥2M ($16K)
2023-04-20SELLunknown
林 順之亮
Junnosuke Hayashi
activist1.0M¥689-0.1%¥2M ($16K)
2022-08-24BUYunknown
株式会社IC
Ic Co., Ltd.
strategic700.0K¥754-8.5%¥528M ($3.4M)
2022-08-24BUYunknown
林 順之亮
Junnosuke Hayashi
activist1.0M¥754-8.5%¥748M ($4.8M)
2022-08-24BUYunknown
林 順之亮
Junnosuke Hayashi
activist1.0M¥754-8.5%¥748M ($4.8M)
2021-07-15BUYMarket Buy
吉澤 信男
Nobuo Yoshizawa
passive5.7M¥1,176-41.3%¥563M ($3.6M)
2021-07-05BUYMarket Buy
吉澤 信男
Nobuo Yoshizawa
passive5.7M¥1,292-46.6%¥619M ($4.0M)
2021-07-05BUYMarket Buy
吉澤 信男
Nobuo Yoshizawa
passive5.7M¥1,292-46.6%¥619M ($4.0M)
2021-06-23BUYnegotiated
林 順之亮
Junnosuke Hayashi
strategic1.7M¥1,289-46.5%¥2.2B ($14.5M)
2021-06-23BUYMarket Buy
吉澤 信男
Nobuo Yoshizawa
passive6.1M¥1,289-46.5%¥7.9B ($50.9M)

Frequently asked questions

Who has been buying Zenken Corporation stock?
3 distinct investors have filed 5 disclosed large-shareholding filings in Zenken Corporation (7371), most recently on 2025-11-19. 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 Zenken Corporation have?
Zenken Corporation has 5 buy-side and 3 sell-side disclosures on record, covering ¥4.4B ($28.1M) in total reported value, spanning 2021-06-23 to 2025-11-19.
Where does StockDrifts get Zenken Corporation 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 Zenken Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.