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.

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.

Nippon Souken Co., Ltd. 5840

Company

株式会社日本総険Nippon Souken Co., Ltd.

Investors

Buys

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. 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

Date	Type	Source	Insider	Purpose	Shares	Price at filing	Return	Value
2025-11-26	SELL	Market Buy	日本アジア投資株式会社 Japan Asia Investment Co., Ltd.	passive	42.9K	¥995	+49.3%	¥7M ($46K)
2024-05-23	SELL	Market Buy	K&Pパートナーズ株式会社 K&Ppartners	passive	53.0K	¥980.223	+48.5%	¥20M ($127K)
2024-04-19	SELL	Market Buy	K&Pパートナーズ株式会社 K&Ppartners	passive	73.0K	¥980.223	+48.5%	¥10M ($63K)
2024-04-19	BUY	Market Buy	K&Pパートナーズ株式会社 K&Ppartners	passive	73.0K	¥980.223	-	¥10M ($63K)
2023-08-22	BUY	unknown	葛石智 SATOSHI KASSEKI	strategic	254.6K	¥980.223	-	¥250M ($1.6M)
2023-08-14	BUY	Market Buy	K&Pパートナーズ株式会社 K&Ppartners	passive	83.0K	¥980.223	-	¥81M ($525K)
2023-08-14	BUY	Market Buy	K&Pパートナーズ株式会社 K&Ppartners	passive	83.0K	¥980.223	-48.5%	¥81M ($525K)
2023-08-08	BUY	unknown	葛石智 SATOSHI KASSEKI	strategic	254.6K	¥980.223	-	¥250M ($1.6M)
2023-08-08	BUY	unknown	葛石晋三 SHINZO KASSEKI	strategic	103.3K	¥980.223	-	¥101M ($653K)
2023-08-08	BUY	unknown	葛石真士 MASASHI KASSEKI	strategic	103.3K	¥980.223	-	¥101M ($653K)
2023-08-08	BUY	unknown	葛石智 SATOSHI KASSEKI	unknown	250.0K	¥980.223	-48.5%	¥245M ($1.6M)
2023-08-08	BUY	unknown	葛石晋三 SHINZO KASSEKI	unknown	101.0K	¥980.223	-48.5%	¥99M ($639K)
2023-08-08	BUY	Market Buy	日本アジア投資株式会社 Japan Asia Investment Co., Ltd.	passive	50.0K	¥980.223	-48.5%	¥49M ($316K)
2023-08-08	BUY	unknown	葛石真士 MASASHI KASSEKI	unknown	101.0K	¥980.223	-48.5%	¥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.
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.