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Nippon Souken Co., Ltd. 5840

Company
株式会社日本総険Nippon Souken Co., Ltd.
Investors
5
Buys
5
Total Value
¥573M ($3.7M)
Avg Return
+3.04%
Last Filing
2025-11-26

Nippon Souken Co., Ltd. (5840) has 5 disclosed large-shareholding filings and 3 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥573M ($3.7M) in reported transaction value. The earliest filing StockDrifts holds for Nippon Souken Co., Ltd. is dated 2023-08-08; the most recent is 2025-11-26. 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 +3.04%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2025-11-26SELLMarket Buy
日本アジア投資株式会社
Japan Asia Investment Co., Ltd.
passive42.9K¥995-1.5%¥7M ($46K)
2024-05-23SELLMarket Buy
K&Pパートナーズ株式会社
K&Ppartners
passive53.0K¥980.223-3.0%¥20M ($127K)
2024-04-19SELLMarket Buy
K&Pパートナーズ株式会社
K&Ppartners
passive73.0K¥980.223-3.0%¥10M ($63K)
2024-04-19BUYMarket Buy
K&Pパートナーズ株式会社
K&Ppartners
passive73.0K¥980.223+3.0%¥10M ($63K)
2023-08-22BUYunknown
葛石 智
SATOSHI KASSEKI
strategic254.6K¥980.223+3.0%¥250M ($1.6M)
2023-08-14BUYMarket Buy
K&Pパートナーズ株式会社
K&Ppartners
passive83.0K¥980.223+3.0%¥81M ($525K)
2023-08-14BUYMarket Buy
K&Pパートナーズ株式会社
K&Ppartners
passive83.0K¥980.223+3.0%¥81M ($525K)
2023-08-08BUYunknown
葛石 晋三
SHINZO KASSEKI
unknown101.0K¥980.223+3.0%¥99M ($639K)
2023-08-08BUYunknown
葛石 智
SATOSHI KASSEKI
unknown250.0K¥980.223+3.0%¥245M ($1.6M)
2023-08-08BUYunknown
葛石 真士
MASASHI KASSEKI
strategic103.3K¥980.223+3.0%¥101M ($653K)
2023-08-08BUYunknown
葛石 晋三
SHINZO KASSEKI
strategic103.3K¥980.223+3.0%¥101M ($653K)
2023-08-08BUYunknown
葛石 智
SATOSHI KASSEKI
strategic254.6K¥980.223+3.0%¥250M ($1.6M)
2023-08-08BUYMarket Buy
日本アジア投資株式会社
Japan Asia Investment Co., Ltd.
passive50.0K¥980.223+3.0%¥49M ($316K)
2023-08-08BUYunknown
葛石 真士
MASASHI KASSEKI
unknown101.0K¥980.223+3.0%¥99M ($639K)

Frequently asked questions

Who has been buying Nippon Souken Co., Ltd. stock?
5 distinct investors have filed 5 disclosed large-shareholding filings in Nippon Souken Co., Ltd. (5840), most recently on 2025-11-26. 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 Nippon Souken Co., Ltd. have?
Nippon Souken Co., Ltd. has 5 buy-side and 3 sell-side disclosures on record, covering ¥573M ($3.7M) in total reported value, spanning 2023-08-08 to 2025-11-26.
Where does StockDrifts get Nippon Souken 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 Nippon Souken Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.