Who has been buying Kohsoku Corporation stock?

11 distinct investors have filed 37 disclosed large-shareholding filings in Kohsoku Corporation (7504), most recently on 2025-09-29. 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 Kohsoku Corporation have?

Kohsoku Corporation has 37 buy-side and 18 sell-side disclosures on record, covering ¥18.3B ($117.9M) in total reported value, spanning 2021-04-30 to 2025-09-29.

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.

Kohsoku Corporation 7504

Company

株式会社高速Kohsoku Corporation

Investors

Buys

Total Value

¥18.3B ($117.9M)

Avg Return

+82.14%

Last Filing

2025-09-29

Kohsoku Corporation (7504) has 37 disclosed large-shareholding filings and 18 disclosed disposals on record, filed by 11 distinct investors. Together those filings cover ¥18.3B ($117.9M) in reported transaction value. The earliest filing StockDrifts holds for Kohsoku Corporation is dated 2021-04-30; the most recent is 2025-09-29. Across these filings the average return since disclosure is +82.14%, 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
2026-09-11	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	849.6K	¥4,395	+1.9%	¥923M ($6.0M)
2026-06-22	BUY	unknown	フィデリティマネジメントアンドリサーチカンパニーエルエルシー (Fidelity Management & Research Company LLC) Fidelity Management & Research Company LLC	corporate	2.1M	¥3,110	-	-
2026-06-22	BUY	unknown	フィデリティマネジメントトラストカンパニー Fidelity Management Trust Company	other	289.6K	¥3,110	-	¥901M ($5.8M)
2026-06-22	BUY	unknown	フィデリティマネジメントアンドリサーチカンパニーエルエルシー (Fidelity Management & Research Company LLC) Fidelity Management & Research Company LLC	corporate	2.1M	¥3,110	-	-
2026-06-22	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	2.1M	¥3,110	-	¥457M ($2.9M)
2026-06-22	SELL	unknown	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	1.8M	¥3,110	-38.6%	¥900M ($5.8M)
2025-09-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.1M	¥2,974	+44.9%	¥25M ($161K)
2025-02-21	SELL	negotiated	高速興産A号株式会社 Kohsoku Kosan A	activist	1.1M	¥2,096	-105.6%	¥4M ($28K)
2025-02-21	SELL	negotiated	高速興産B号株式会社 Kohsoku Kosan B	activist	2.8M	¥2,096	-105.6%	¥4M ($28K)
2025-02-21	SELL	negotiated	高速興産C号株式会社 Kohsoku Kosan C	activist	2.8M	¥2,096	-105.6%	¥4M ($28K)
2025-02-21	SELL	negotiated	赫由美子 Yumiko Akira	activist	508.6K	¥2,096	-105.6%	¥4M ($28K)
2023-03-13	BUY	Market Buy	高速興産C号株式会社 Kohsoku Kosan C	activist	2.8M	¥1,963	+119.6%	¥1.2B ($7.7M)
2023-03-13	BUY	Market Buy	高速興産B号株式会社 Kohsoku Kosan B	activist	2.8M	¥1,963	+119.6%	¥1.2B ($7.9M)
2023-03-13	SELL	Market Buy	赫高規 Takanori Akira	unknown	0	¥1,963	-119.6%	¥1.2B ($7.9M)
2023-03-13	SELL	Market Buy	赫裕規 Hiroki Akira	unknown	0	¥1,963	-119.6%	¥1.2B ($7.8M)
2023-02-28	BUY	negotiated	高速興産株式会社 Kohsoku Kosan	activist	0	¥1,901	-	¥10.4B ($67.4M)
2023-02-28	BUY	negotiated	高速興産C号株式会社 Kohsoku Kosan C	activist	2.2M	¥1,901	+126.7%	¥4.2B ($26.9M)
2023-02-28	BUY	negotiated	高速興産B号株式会社 Kohsoku Kosan B	activist	2.2M	¥1,901	+126.7%	¥4.2B ($26.9M)
2023-02-28	BUY	negotiated	高速興産A号株式会社 Kohsoku Kosan A	activist	1.1M	¥1,901	+126.7%	¥2.1B ($13.7M)
2023-02-28	SELL	negotiated	高速興産株式会社 Kohsoku Kosan	activist	0	¥1,901	-126.7%	¥10.4B ($67.4M)
2023-02-28	BUY	negotiated	赫由美子 Yumiko Akira	activist	508.6K	¥1,901	+126.7%	¥967M ($6.2M)
2023-02-28	BUY	negotiated	赫高規 Takanori Akira	activist	621.8K	¥1,901	+126.7%	¥1.2B ($7.6M)
2023-02-28	BUY	negotiated	赫裕規 Hiroki Akira	activist	611.8K	¥1,901	+126.7%	¥1.2B ($7.5M)
2023-02-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	300.9K	¥1,919	-	-
2023-02-07	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	900	¥1,919	-124.6%	¥19M ($124K)
2023-02-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	203.4K	¥1,919	-124.6%	¥4M ($26K)
2023-01-11	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	300.9K	¥1,720	+150.6%	¥518M ($3.3M)
2023-01-11	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	999.1K	¥1,720	+150.6%	¥1.7B ($11.1M)
2023-01-11	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	204.9K	¥1,720	+150.6%	¥352M ($2.3M)
2023-01-10	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	300.9K	¥1,700	-	-
2023-01-10	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	207.3K	¥1,700	-153.5%	¥14M ($92K)
2023-01-10	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	100	¥1,700	-153.5%	¥28M ($178K)
2023-01-06	BUY	negotiated	高速興産株式会社 Kohsoku Kohsan	activist	5.5M	¥1,692	-	-
2022-10-06	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	300.9K	¥1,594	+170.4%	¥480M ($3.1M)
2022-10-06	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	1.6M	¥1,594	+170.4%	¥2.6B ($16.7M)
2022-10-06	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	216.1K	¥1,594	+170.4%	¥344M ($2.2M)
2022-10-05	BUY	negotiated	高速興産株式会社 Kohsoku Kohsan	activist	5.5M	¥1,583	-	-
2022-10-04	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	300.9K	¥1,595	-	-
2022-10-04	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	100	¥1,595	-170.2%	¥26M ($167K)
2022-10-04	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	216.0K	¥1,595	-170.2%	¥27M ($173K)
2022-07-06	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	1.6M	¥1,500	+187.3%	¥2.4B ($15.7M)
2022-07-06	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	300.9K	¥1,500	+187.3%	¥451M ($2.9M)
2022-07-06	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	232.8K	¥1,500	+187.3%	¥349M ($2.3M)
2022-07-05	BUY	negotiated	高速興産株式会社 Kohsoku Kohsan	activist	5.5M	¥1,511	-	-
2022-07-05	BUY	negotiated	高速興産株式会社 Kohsoku Kohsan	activist	5.5M	¥1,511	-	-
2022-07-04	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	300.9K	¥1,522	-	-
2022-07-04	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	unknown	0	¥1,522	-183.2%	¥25M ($160K)
2022-07-04	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	233.0K	¥1,522	-183.2%	¥19M ($124K)
2022-04-06	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	245.1K	¥1,572	+174.2%	¥385M ($2.5M)
2022-04-06	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	300.9K	¥1,572	+174.2%	¥473M ($3.1M)

Showing the 50 most recent of 82 filings.

Frequently asked questions

Who has been buying Kohsoku Corporation stock?: 11 distinct investors have filed 37 disclosed large-shareholding filings in Kohsoku Corporation (7504), most recently on 2025-09-29. 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 Kohsoku Corporation have?: Kohsoku Corporation has 37 buy-side and 18 sell-side disclosures on record, covering ¥18.3B ($117.9M) in total reported value, spanning 2021-04-30 to 2025-09-29.
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.