Who has been buying Kurogane Kosakusho Ltd. stock?

7 distinct investors have filed 4 disclosed large-shareholding filings in Kurogane Kosakusho Ltd. (7997), most recently on 2025-08-14. 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 Kurogane Kosakusho Ltd. have?

Kurogane Kosakusho Ltd. has 4 buy-side and 12 sell-side disclosures on record, covering ¥350M ($2.3M) in total reported value, spanning 2021-08-12 to 2025-08-14.

Where does StockDrifts get Kurogane Kosakusho 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.

Kurogane Kosakusho Ltd. 7997

Company

株式会社くろがね工作所Kurogane Kosakusho Ltd.

Investors

Buys

Total Value

¥350M ($2.3M)

Avg Return

+53.00%

Last Filing

2025-08-14

Kurogane Kosakusho Ltd. (7997) has 4 disclosed large-shareholding filings and 12 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥350M ($2.3M) in reported transaction value. The earliest filing StockDrifts holds for Kurogane Kosakusho Ltd. is dated 2021-08-12; the most recent is 2025-08-14. 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 +53.00%, 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
2026-06-30	SELL	unknown	エイ・シイ工業株式会社 EISHI KOGYO CO.,LTD.	other	69.4K	¥1,024	-1.8%	¥72M ($463K)
2025-08-14	SELL	unknown	神足尚孝 Naotaka Kamisari	other	49.4K	¥815	-20.6%	¥10M ($62K)
2025-08-14	SELL	unknown	ワイ・ケイ株式会社 YK Co., Ltd.	other	148.0K	¥815	-20.6%	¥6M ($37K)
2025-08-14	SELL	unknown	神足尚孝 Naotaka Kamisari	other	49.4K	¥815	-20.6%	¥10M ($62K)
2025-08-14	SELL	unknown	神足尚孝 Naotaka Kamisari	other	49.4K	¥815	-20.6%	¥10M ($62K)
2025-08-14	SELL	unknown	ワイ・ケイ株式会社 YK Co., Ltd.	other	148.0K	¥815	-20.6%	¥6M ($37K)
2025-08-14	SELL	unknown	ワイ・ケイ株式会社 YK Co., Ltd.	other	148.0K	¥815	-20.6%	¥6M ($37K)
2025-07-28	BUY	unknown	ワイ・ケイ株式会社 YK Co., Ltd.	other	155.0K	¥807	+21.8%	¥125M ($807K)
2025-07-28	BUY	unknown	神足尚孝 Naotaka Kamisari	other	61.0K	¥807	+21.8%	¥49M ($318K)
2025-07-16	BUY	unknown	ワイ・ケイ株式会社 YK Co., Ltd.	other	155.0K	¥785	+25.2%	¥122M ($785K)
2025-07-16	SELL	unknown	ワイ・ケイ株式会社 YK Co., Ltd.	other	148.0K	¥785	-25.2%	¥6M ($36K)
2025-07-16	SELL	unknown	神足尚孝 Naotaka Kamisari	other	50.3K	¥785	-25.2%	¥8M ($55K)
2025-07-16	BUY	unknown	神足尚孝 Naotaka Kamisari	other	61.0K	¥785	+25.2%	¥48M ($309K)
2024-06-28	SELL	unknown	吉田強夫 Takeo Yoshida	unknown	0	¥1,178	+16.6%	¥126M ($812K)
2023-11-07	BUY	Market Buy	吉田強夫 Takeo Yoshida	passive	126.3K	¥818	+20.2%	¥103M ($667K)
2023-11-07	SELL	Market Buy	吉田強夫 Takeo Yoshida	passive	106.8K	¥818	-20.2%	¥16M ($103K)
2023-10-17	BUY	Market Buy	ASIA PLASTIC VICTORY PTE.LTD.	passive	106.8K	¥840	+17.0%	¥16M ($106K)
2023-10-17	BUY	Market Buy	ASIA PLASTIC VICTORY PTE.LTD.	passive	126.3K	¥840	+17.0%	¥106M ($684K)
2023-10-17	SELL	Market Buy	ASIA PLASTIC VICTORY PTE.LTD.	passive	106.8K	¥840	-17.0%	¥16M ($106K)
2023-10-17	BUY	Market Buy	ASIA PLASTIC VICTORY PTE.LTD.	passive	126.3K	¥840	+17.0%	¥106M ($684K)
2023-03-29	SELL	unknown	くろがね取引先持株会理事長田中暁 Akira Tanaka	strategic	0	¥425	-131.3%	¥40M ($255K)
2023-03-29	BUY	unknown	くろがね取引先持株会理事長出井富男 Tomio Dei	strategic	107.2K	¥425	+131.3%	¥46M ($294K)
2021-08-12	BUY	unknown	エイ・シイ工業株式会社 EISHI KOGYO CO.,LTD.	other	139.4K	¥685	+43.5%	¥95M ($616K)

Frequently asked questions

Who has been buying Kurogane Kosakusho Ltd. stock?: 7 distinct investors have filed 4 disclosed large-shareholding filings in Kurogane Kosakusho Ltd. (7997), most recently on 2025-08-14. 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 Kurogane Kosakusho Ltd. have?: Kurogane Kosakusho Ltd. has 4 buy-side and 12 sell-side disclosures on record, covering ¥350M ($2.3M) in total reported value, spanning 2021-08-12 to 2025-08-14.
Where does StockDrifts get Kurogane Kosakusho 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 Kurogane Kosakusho Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.