Who has been buying Nihon Seiko Co., Ltd. stock?

7 distinct investors have filed 3 disclosed large-shareholding filings in Nihon Seiko Co., Ltd. (5729), most recently on 2024-01-26. 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 Nihon Seiko Co., Ltd. have?

Nihon Seiko Co., Ltd. has 3 buy-side and 1 sell-side disclosures on record, covering ¥42M ($272K) in total reported value, spanning 2021-04-22 to 2024-01-26.

Where does StockDrifts get Nihon Seiko 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.

Nihon Seiko Co., Ltd. 5729

Company

日本精鉱株式会社Nihon Seiko Co., Ltd.

Investors

Buys

Total Value

¥42M ($272K)

Avg Return

+227.27%

Last Filing

2024-01-26

Nihon Seiko Co., Ltd. (5729) has 3 disclosed large-shareholding filings and 1 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥42M ($272K) in reported transaction value. The earliest filing StockDrifts holds for Nihon Seiko Co., Ltd. is dated 2021-04-22; the most recent is 2024-01-26. 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 +227.27%, 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
2024-01-26	SELL	unknown	双日株式会社 Sojitz Corporation	corporate	90.3K	¥648.75	-280.9%	¥27M ($175K)
2024-01-26	BUY	unknown	双日株式会社 Sojitz Corporation	corporate	90.3K	¥648.75	+280.9%	¥27M ($175K)
2022-09-08	BUY	unknown	有限会社アルメルト Armelt Co., Ltd.	activist	11.1K	¥785	+214.8%	¥9M ($56K)
2022-09-08	BUY	unknown	富士興産株式会社 Fuji Kosan Co., Ltd.	activist	130.0K	¥785	+214.8%	¥12M ($77K)
2022-09-08	BUY	unknown	株式会社三興企画 Sanko Planning Co., Ltd.	activist	242.0K	¥785	+214.8%	¥190M ($1.2M)
2022-09-08	BUY	unknown	株式会社三光 Sanko Co., Ltd.	activist	242.0K	¥785	+214.8%	¥190M ($1.2M)
2022-09-08	BUY	unknown	川嶋義勝 Yoshikatsu Kawashima	activist	10.0K	¥785	+214.8%	¥8M ($51K)
2022-09-08	BUY	unknown	有限会社アルメルト Armelt Co., Ltd.	activist	11.1K	¥785	+214.8%	¥9M ($56K)
2022-09-08	BUY	unknown	富士興産株式会社 Fuji Kosan Co., Ltd.	activist	130.0K	¥785	+214.8%	¥12M ($77K)
2022-09-08	BUY	unknown	株式会社三興企画 Sanko Planning Co., Ltd.	activist	242.0K	¥785	+214.8%	¥190M ($1.2M)
2022-09-08	BUY	unknown	株式会社三光 Sanko Co., Ltd.	activist	242.0K	¥785	+214.8%	¥190M ($1.2M)
2022-09-08	BUY	unknown	川嶋義勝 Yoshikatsu Kawashima	activist	10.0K	¥785	+214.8%	¥8M ($51K)
2022-09-08	BUY	unknown	株式会社川嶋 Kawashima Co.,Ltd	activist	242.0K	¥785	+214.8%	¥190M ($1.2M)
2022-09-08	BUY	unknown	株式会社川嶋 Kawashima Co.,Ltd	activist	242.0K	¥785	+214.8%	¥190M ($1.2M)
2021-04-22	BUY	unknown	富士興産株式会社 Fuji Kosan Co., Ltd.	activist	114.9K	¥701.5	+252.3%	¥18M ($119K)
2021-04-22	BUY	unknown	株式会社三興企画 Sanko Planning Co., Ltd.	activist	242.0K	¥701.5	+252.3%	¥170M ($1.1M)
2021-04-22	BUY	unknown	株式会社三光 Sanko Co., Ltd.	activist	242.0K	¥701.5	+252.3%	¥170M ($1.1M)
2021-04-22	BUY	unknown	川嶋義勝 Yoshikatsu Kawashima	activist	10.0K	¥701.5	+252.3%	¥7M ($45K)
2021-04-22	BUY	unknown	株式会社川嶋 Kawashima Co.,Ltd	activist	242.0K	¥701.5	+252.3%	¥170M ($1.1M)

Frequently asked questions

Who has been buying Nihon Seiko Co., Ltd. stock?: 7 distinct investors have filed 3 disclosed large-shareholding filings in Nihon Seiko Co., Ltd. (5729), most recently on 2024-01-26. 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 Nihon Seiko Co., Ltd. have?: Nihon Seiko Co., Ltd. has 3 buy-side and 1 sell-side disclosures on record, covering ¥42M ($272K) in total reported value, spanning 2021-04-22 to 2024-01-26.
Where does StockDrifts get Nihon Seiko 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 Nihon Seiko Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.