Who has been buying Yamashin-Filter Corp. stock?

19 distinct investors have filed 37 disclosed large-shareholding filings in Yamashin-Filter Corp. (6240), most recently on 2026-03-23. 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 Yamashin-Filter Corp. have?

Yamashin-Filter Corp. has 37 buy-side and 26 sell-side disclosures on record, covering ¥13.2B ($85.0M) in total reported value, spanning 2021-03-18 to 2026-03-23.

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.

Yamashin-Filter Corp. 6240

Company

ヤマシンフィルタ株式会社Yamashin-Filter Corp.

Investors

Buys

Total Value

¥13.2B ($85.0M)

Avg Return

+16.41%

Last Filing

2026-03-23

Yamashin-Filter Corp. (6240) has 37 disclosed large-shareholding filings and 26 disclosed disposals on record, filed by 19 distinct investors. Together those filings cover ¥13.2B ($85.0M) in reported transaction value. The earliest filing StockDrifts holds for Yamashin-Filter Corp. is dated 2021-03-18; the most recent is 2026-03-23. Across these filings the average return since disclosure is +16.41%, 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
2026-09-25	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.0M	¥520	+0.0%	¥480M ($3.1M)
2026-06-05	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	4.0M	¥531	+2.1%	¥431M ($2.8M)
2026-03-23	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	4.8M	¥473	-9.9%	¥361M ($2.3M)
2026-01-09	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	5.5M	¥605	-14.1%	¥482M ($3.1M)
2025-09-22	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	4.7M	¥726	-28.4%	¥757M ($4.9M)
2025-07-23	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.8M	¥645	-19.4%	¥2.4B ($15.7M)
2024-06-12	BUY	Market Buy	株式会社しらかばホールディングス Shirakaba Holdings Co., Ltd.	activist	900.0K	¥366	+42.1%	¥3M ($17K)
2024-06-12	BUY	Market Buy	山﨑裕明 Hiroaki Yamazaki	activist	2.2M	¥366	+42.1%	¥8M ($51K)
2024-06-12	BUY	Market Buy	山﨑敦彦 Atsuhiko Yamazaki	activist	1.3M	¥366	+42.1%	¥5M ($34K)
2024-06-12	SELL	Market Buy	株式会社やまびこホールディングス Yamabiko Holdings Co., Ltd.	unknown	0	¥366	-42.1%	¥44M ($282K)
2024-06-12	BUY	Market Buy	山﨑千鶴子 Chizuko Yamazaki	strategic	100.5K	¥366	-	-
2024-06-12	BUY	Market Buy	株式会社あさまホールディングス Asama Holdings Co., Ltd.	activist	24.1M	¥366	+42.1%	¥4.5B ($28.7M)
2024-06-12	BUY	Market Buy	株式会社けやきホールディングス Keyaki Holdings Co., Ltd.	activist	900.0K	¥366	+42.1%	¥3M ($17K)
2023-12-06	BUY	Market Buy	山﨑裕明 Hiroaki Yamazaki	activist	2.2M	¥332	+56.6%	¥38M ($248K)
2023-12-06	BUY	Market Buy	山﨑敦彦 Atsuhiko Yamazaki	activist	1.3M	¥332	+56.6%	¥77M ($494K)
2023-12-06	SELL	Market Buy	株式会社やまびこホールディングス Yamabiko Holdings Co., Ltd.	activist	12.1M	¥332	-56.6%	¥36M ($231K)
2023-12-06	BUY	Market Buy	山﨑千鶴子 Chizuko Yamazaki	strategic	100.5K	¥332	-	-
2023-12-06	SELL	Market Buy	株式会社あさまホールディングス Asama Holdings Co., Ltd.	activist	12.0M	¥332	-56.6%	¥36M ($233K)
2023-12-06	SELL	Market Buy	株式会社けやきホールディングス Keyaki Holdings Co., Ltd.	activist	900.0K	¥332	-56.6%	¥2M ($16K)
2023-12-06	SELL	Market Buy	株式会社しらかばホールディングス Shirakaba Holdings Co., Ltd.	activist	900.0K	¥332	-56.6%	¥2M ($16K)
2023-02-22	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	116.2K	¥392	-32.6%	¥109M ($706K)
2023-02-22	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	3.6K	¥392	-32.6%	¥281M ($1.8M)
2023-02-22	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.7M	¥392	+32.6%	¥652M ($4.2M)
2023-02-07	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	394.8K	¥467	+11.3%	¥13M ($86K)
2023-02-07	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	3.2M	¥467	+11.3%	¥1.5B ($9.6M)
2023-02-07	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	11.3K	¥467	-	¥5M ($34K)
2022-12-01	BUY	negotiated	山﨑敬明 Takaaki Yamazaki	activist	2.0M	¥496	-	-
2022-12-01	BUY	negotiated	山﨑敬明 Takaaki Yamazaki	activist	2.0M	¥496	-	-
2022-12-01	BUY	negotiated	株式会社みなとホールディングス Minato Holdings Co., Ltd.	activist	1.8M	¥496	-	-
2022-12-01	BUY	negotiated	株式会社みなとホールディングス Minato Holdings Co., Ltd.	activist	1.8M	¥496	-	-
2022-05-23	BUY	negotiated	山﨑裕明 Hiroaki Yamazaki	activist	2.0M	¥311	+67.2%	¥560M ($3.6M)
2022-05-23	BUY	negotiated	山﨑敦彦 Atsuhiko Yamazaki	activist	1.1M	¥311	-	-
2022-05-23	BUY	negotiated	株式会社やまびこホールディングス Yamabiko Holdings Co., Ltd.	activist	12.1M	¥311	+67.2%	¥3.7B ($23.7M)
2022-05-23	BUY	negotiated	山﨑千鶴子 Chizuko Yamazaki	strategic	100.5K	¥311	-	-
2022-05-23	BUY	negotiated	株式会社あさまホールディングス Asama Holdings Co., Ltd.	activist	12.0M	¥311	+67.2%	¥3.7B ($24.1M)
2022-05-23	BUY	negotiated	株式会社けやきホールディングス Keyaki Holdings Co., Ltd.	activist	900.0K	¥311	+67.2%	¥280M ($1.8M)
2022-05-23	BUY	negotiated	株式会社しらかばホールディングス Shirakaba Holdings Co., Ltd.	activist	900.0K	¥311	+67.2%	¥280M ($1.8M)
2022-05-11	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	360.9K	¥342	+52.0%	¥123M ($796K)
2022-05-11	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	4.0M	¥342	+52.0%	¥1.4B ($8.8M)
2022-03-25	BUY	Market Buy	山﨑千鶴子 Chizuko Yamazaki	strategic	100.5K	¥364	-	-
2022-03-25	BUY	negotiated	山﨑敬明 Takaaki Yamazaki	activist	2.0M	¥364	+42.9%	¥719M ($4.6M)
2022-03-25	BUY	negotiated	山﨑敬明 Takaaki Yamazaki	activist	2.0M	¥364	+42.9%	¥719M ($4.6M)
2022-03-25	BUY	Market Buy	山﨑敦彦 Atsuhiko Yamazaki	activist	1.1M	¥364	+42.9%	¥13M ($84K)
2022-03-25	SELL	Market Buy	株式会社やまびこホールディングス Yamabiko Holdings Co., Ltd.	activist	24.1M	¥364	-42.9%	¥8M ($50K)
2022-03-25	SELL	Market Buy	山﨑裕明 Hiroaki Yamazaki	strategic	3.8M	¥364	-42.9%	¥3M ($17K)
2022-03-25	BUY	negotiated	株式会社みなとホールディングス Minato Holdings Co., Ltd.	activist	1.8M	¥364	+42.9%	¥655M ($4.2M)
2022-03-25	BUY	negotiated	株式会社みなとホールディングス Minato Holdings Co., Ltd.	activist	1.8M	¥364	+42.9%	¥655M ($4.2M)
2022-02-28	SELL	Market Buy	カバウター・マネージメント・エルエルシー (Kabouter Management, LLC) Kabouter Management, LLC	passive	694	¥363	-43.3%	¥1.3B ($8.6M)
2022-02-15	SELL	Market Buy	カバウター・マネージメント・エルエルシー (Kabouter Management, LLC) Kabouter Management, LLC	passive	3.7M	¥377	-37.9%	¥320M ($2.1M)
2022-01-07	SELL	Market Buy	カバウター・マネージメント・エルエルシー (Kabouter Management, LLC) Kabouter Management, LLC	passive	4.5M	¥483	-7.7%	¥435M ($2.8M)

Showing the 50 most recent of 75 filings.

Frequently asked questions

Who has been buying Yamashin-Filter Corp. stock?: 19 distinct investors have filed 37 disclosed large-shareholding filings in Yamashin-Filter Corp. (6240), most recently on 2026-03-23. 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 Yamashin-Filter Corp. have?: Yamashin-Filter Corp. has 37 buy-side and 26 sell-side disclosures on record, covering ¥13.2B ($85.0M) in total reported value, spanning 2021-03-18 to 2026-03-23.
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.