Who has been buying Joban Kosan Co.,Ltd. stock?

6 distinct investors have filed 2 disclosed large-shareholding filings in Joban Kosan Co.,Ltd. (9675), most recently on 2024-12-17. 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 Joban Kosan Co.,Ltd. have?

Joban Kosan Co.,Ltd. has 2 buy-side and 5 sell-side disclosures on record, covering ¥2.3B ($14.8M) in total reported value, spanning 2021-12-07 to 2024-12-17.

Where does StockDrifts get Joban Kosan 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.

Joban Kosan Co.,Ltd. 9675

Company

常磐興産株式会社Joban Kosan Co.,Ltd.

Investors

Buys

Total Value

¥2.3B ($14.8M)

Avg Return

+0.31%

Last Filing

2024-12-17

Joban Kosan Co.,Ltd. (9675) has 2 disclosed large-shareholding filings and 5 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥2.3B ($14.8M) in reported transaction value. The earliest filing StockDrifts holds for Joban Kosan Co.,Ltd. is dated 2021-12-07; the most recent is 2024-12-17. 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 +0.31%, 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
2024-12-17	SELL	unknown	常磐開発株式会社 Joban Kaihatsu Co., Ltd.	unknown	0	¥1,641	-0.1%	¥963M ($6.2M)
2024-12-11	BUY	Market Buy	Ontario合同会社 Ontario GK	activist	7.7M	¥1,638	+0.3%	¥2.3B ($14.8M)
2024-11-25	BUY	negotiated	常磐開発株式会社 Joban Kaihatsu Co., Ltd.	strategic	586.5K	¥1,642	+0.1%	¥963M ($6.2M)
2024-11-06	BUY	acquisition	Ontario合同会社 Ontario GK	activist	6.3M	¥1,638	+0.3%	¥10.4B ($67.0M)
2024-09-24	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	182.4K	¥1,647	-0.2%	¥300M ($1.9M)
2024-09-24	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	12.8K	¥1,647	+0.2%	¥93M ($599K)
2024-09-24	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	42.0K	¥1,647	-0.2%	¥69M ($446K)
2024-09-24	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	188.7K	¥1,647	-0.2%	¥311M ($2.0M)
2024-09-11	BUY	negotiated	常磐開発株式会社 Joban Kaihatsu Co., Ltd.	strategic	586.5K	¥1,660	-1.0%	¥974M ($6.3M)
2024-09-11	BUY	negotiated	常磐開発株式会社 Joban Kaihatsu Co., Ltd.	strategic	586.5K	¥1,660	-1.0%	¥974M ($6.3M)
2024-09-11	BUY	negotiated	常磐開発株式会社 Joban Kaihatsu Co., Ltd.	strategic	586.5K	¥1,660	-1.0%	¥974M ($6.3M)
2024-09-11	BUY	negotiated	常磐開発株式会社 Joban Kaihatsu Co., Ltd.	strategic	586.5K	¥1,660	-1.0%	¥974M ($6.3M)
2022-11-08	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	69.4K	¥1,155	-42.3%	¥122M ($788K)
2022-11-08	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	182.4K	¥1,155	+42.3%	¥211M ($1.4M)
2022-11-08	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	188.7K	¥1,155	+42.3%	¥218M ($1.4M)
2021-12-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	175.4K	¥1,409	-16.6%	¥37M ($240K)
2021-12-07	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	182.4K	¥1,409	+16.6%	¥257M ($1.7M)
2021-12-07	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	300	¥1,409	-16.6%	¥20M ($128K)
2021-12-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	188.7K	¥1,409	+16.6%	¥266M ($1.7M)

Frequently asked questions

Who has been buying Joban Kosan Co.,Ltd. stock?: 6 distinct investors have filed 2 disclosed large-shareholding filings in Joban Kosan Co.,Ltd. (9675), most recently on 2024-12-17. 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 Joban Kosan Co.,Ltd. have?: Joban Kosan Co.,Ltd. has 2 buy-side and 5 sell-side disclosures on record, covering ¥2.3B ($14.8M) in total reported value, spanning 2021-12-07 to 2024-12-17.
Where does StockDrifts get Joban Kosan 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 Joban Kosan Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.