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

10 distinct investors have filed 7 disclosed large-shareholding filings in Matsui Securities Co., Ltd. (8628), most recently on 2024-11-11. 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 Securities Co., Ltd. have?

Matsui Securities Co., Ltd. has 7 buy-side and 6 sell-side disclosures on record, covering ¥9.7B ($62.5M) in total reported value, spanning 2023-08-22 to 2024-11-11.

Where does StockDrifts get Matsui Securities 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.

Matsui Securities Co., Ltd. 8628

Company

松井証券株式会社Matsui Securities Co., Ltd.

Investors

Buys

Total Value

¥9.7B ($62.5M)

Avg Return

+24.00%

Last Filing

2024-11-11

Matsui Securities Co., Ltd. (8628) has 7 disclosed large-shareholding filings and 6 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥9.7B ($62.5M) in reported transaction value. The earliest filing StockDrifts holds for Matsui Securities Co., Ltd. is dated 2023-08-22; the most recent is 2024-11-11. 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 +24.00%, 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
2024-11-11	BUY	unknown	株式会社MamFive MamFive Co., Ltd.	strategic	5.9M	¥840	+16.1%	¥4.9B ($31.8M)
2024-11-11	BUY	unknown	松井道太郎 Michitaro Matsui	other	43.1K	¥840	+16.1%	¥36M ($234K)
2024-11-11	BUY	unknown	有限会社松興社 Shokosha Co., Ltd.	strategic	35.7M	¥840	+16.1%	¥30.0B ($193.6M)
2024-11-11	SELL	unknown	松井道夫 Michio Matsui	other	0	¥840	-16.1%	¥2.2B ($14.1M)
2024-11-11	BUY	unknown	有限会社丸六 Maruroku Co., Ltd.	strategic	96.7M	¥840	+16.1%	¥81.2B ($524.1M)
2024-08-01	SELL	subscription	株式会社MamFive MamFive Co., Ltd.	strategic	5.9M	¥825	-18.2%	¥44.4B ($286.2M)
2024-08-01	SELL	subscription	松井道太郎 Michitaro Matsui	other	43.1K	¥825	-18.2%	¥107M ($690K)
2024-08-01	BUY	subscription	有限会社丸六 Maruroku Co., Ltd.	strategic	96.7M	¥825	+18.2%	¥8.2B ($52.7M)
2024-08-01	BUY	subscription	有限会社松興社 Shokosha Co., Ltd.	strategic	35.7M	¥825	+18.2%	¥29.5B ($190.1M)
2024-08-01	SELL	subscription	松井千鶴子 Chizuko Matsui	other	0	¥825	-18.2%	¥4.4B ($28.3M)
2024-08-01	SELL	subscription	松井道夫 Michio Matsui	other	15.6K	¥825	-18.2%	¥1.6B ($10.6M)
2023-12-19	BUY	unknown	松井千鶴子 Chizuko Matsui	strategic	5.3M	¥713	+36.8%	¥3.8B ($24.5M)
2023-12-19	BUY	unknown	松井道夫 Michio Matsui	strategic	4.6M	¥713	+36.8%	¥3.3B ($21.1M)
2023-12-19	BUY	unknown	株式会社MamFive MamFive Co., Ltd.	strategic	600.0K	¥713	+36.8%	¥428M ($2.8M)
2023-12-19	BUY	unknown	松井道太郎 Michitaro Matsui	activist	5.3M	¥713	+36.8%	¥37M ($239K)
2023-12-19	BUY	unknown	有限会社丸六 Maruroku Co., Ltd.	strategic	86.8M	¥713	+36.8%	¥61.9B ($399.3M)
2023-12-19	BUY	unknown	有限会社松興社 Shokosha Co., Ltd.	strategic	35.7M	¥713	+36.8%	¥25.5B ($164.3M)
2023-10-06	BUY	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	3.8M	¥781	+24.8%	¥2.8B ($18.4M)
2023-10-06	BUY	Market Buy	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	other	0	¥781	+24.8%	-
2023-10-06	BUY	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	2.2M	¥781	+24.8%	¥1.2B ($7.6M)
2023-10-06	SELL	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	1.3M	¥781	-24.8%	¥3.1B ($19.7M)
2023-08-22	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	13.6M	¥805	+21.1%	¥10.9B ($70.1M)
2023-08-22	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	711.8K	¥805	+21.1%	¥313M ($2.0M)
2023-08-22	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	53.4K	¥805	+21.1%	¥4.0B ($25.9M)

Frequently asked questions

Who has been buying Matsui Securities Co., Ltd. stock?: 10 distinct investors have filed 7 disclosed large-shareholding filings in Matsui Securities Co., Ltd. (8628), most recently on 2024-11-11. 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 Securities Co., Ltd. have?: Matsui Securities Co., Ltd. has 7 buy-side and 6 sell-side disclosures on record, covering ¥9.7B ($62.5M) in total reported value, spanning 2023-08-22 to 2024-11-11.
Where does StockDrifts get Matsui Securities 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 Matsui Securities Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.