Who has been buying Matsui Construction Co., Ltd. stock?

6 distinct investors have filed 5 disclosed large-shareholding filings in Matsui Construction Co., Ltd. (1810), most recently on 2025-09-26. 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 Matsui Construction Co., Ltd. have?

Matsui Construction Co., Ltd. has 5 buy-side and 4 sell-side disclosures on record, covering ¥444M ($2.9M) in total reported value, spanning 2021-12-07 to 2025-09-26.

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.

Matsui Construction Co., Ltd. 1810

Company

松井建設株式会社Matsui Construction Co., Ltd.

Investors

Buys

Total Value

¥444M ($2.9M)

Avg Return

+49.01%

Last Filing

2025-09-26

Matsui Construction Co., Ltd. (1810) has 5 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥444M ($2.9M) in reported transaction value. The earliest filing StockDrifts holds for Matsui Construction Co., Ltd. is dated 2021-12-07; the most recent is 2025-09-26. Across these filings the average return since disclosure is +49.01%, 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
2026-09-15	BUY	Market Buy	株式会社UH Partners 2	passive	107.0K	¥1,443	-	-
2026-09-15	BUY	Market Buy	光通信株式会社	passive	2.2M	¥1,443	-	-
2025-09-26	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	2.2M	¥1,467	-0.8%	¥40M ($260K)
2025-09-26	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	107.0K	¥1,467	-0.8%	¥157M ($1.0M)
2025-03-18	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	2.1M	¥937	+55.4%	¥287M ($1.8M)
2024-11-22	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.8M	¥860	+69.3%	¥268M ($1.7M)
2024-07-31	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.5M	¥859	+69.5%	¥1.3B ($8.5M)
2022-09-26	SELL	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	1.3M	¥564	-158.2%	¥112M ($723K)
2022-09-26	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	764.0K	¥564	-	-
2022-09-26	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	378.8K	¥564	-158.2%	¥81M ($523K)
2022-02-21	SELL	negotiated	株式会社北陸銀行 The Hokuriku Bank, Ltd	strategic	1.3M	¥741	-96.5%	¥147M ($950K)
2021-12-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	1.5M	¥773	-	-
2021-12-07	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	764.0K	¥773	-	-
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	521.4K	¥773	-88.4%	¥111M ($717K)

Frequently asked questions

Who has been buying Matsui Construction Co., Ltd. stock?: 6 distinct investors have filed 5 disclosed large-shareholding filings in Matsui Construction Co., Ltd. (1810), most recently on 2025-09-26. 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 Matsui Construction Co., Ltd. have?: Matsui Construction Co., Ltd. has 5 buy-side and 4 sell-side disclosures on record, covering ¥444M ($2.9M) in total reported value, spanning 2021-12-07 to 2025-09-26.
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.