Who has been buying TOSNET Corporation stock?

4 distinct investors have filed 7 disclosed large-shareholding filings in TOSNET Corporation (4754), 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 TOSNET Corporation have?

TOSNET Corporation has 7 buy-side and 1 sell-side disclosures on record, covering ¥242M ($1.6M) in total reported value, spanning 2021-07-15 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.

TOSNET Corporation 4754

Company

株式会社トスネットTOSNET Corporation

Investors

Buys

Total Value

¥242M ($1.6M)

Avg Return

+41.34%

Last Filing

2025-09-26

TOSNET Corporation (4754) has 7 disclosed large-shareholding filings and 1 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥242M ($1.6M) in reported transaction value. The earliest filing StockDrifts holds for TOSNET Corporation is dated 2021-07-15; the most recent is 2025-09-26. Across these filings the average return since disclosure is +41.34%, 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
2026-06-17	BUY	Market Buy	佐藤康廣	activist	140.6K	¥1,500	-0.2%	¥17M ($110K)
2026-06-17	SELL	unknown	佐藤雅彦	unknown	0	¥1,500	+0.2%	¥822M ($5.3M)
2026-06-17	BUY	Market Buy	有限会社元気	other	1.8M	¥1,500	-0.2%	¥834M ($5.4M)
2026-06-05	SELL	unknown	佐藤康廣	activist	129.0K	¥1,514	+1.1%	¥21M ($139K)
2026-06-05	SELL	unknown	佐藤康廣	activist	129.0K	¥1,514	+1.1%	¥21M ($139K)
2026-06-05	SELL	unknown	佐藤雅彦	activist	548.2K	¥1,514	+1.1%	¥98M ($633K)
2026-06-05	SELL	unknown	佐藤公子	strategic	34.0K	¥1,514	+1.1%	¥6M ($37K)
2026-06-05	SELL	unknown	有限会社元気	other	1.2M	¥1,514	+1.1%	¥218M ($1.4M)
2026-06-05	SELL	unknown	有限会社元気	other	1.2M	¥1,514	+1.1%	¥218M ($1.4M)
2026-06-05	SELL	unknown	佐藤公子	strategic	34.0K	¥1,514	+1.1%	¥6M ($37K)
2026-06-05	SELL	unknown	佐藤雅彦	activist	548.2K	¥1,514	+1.1%	¥98M ($633K)
2026-06-02	SELL	unknown	佐藤康廣	activist	129.0K	¥1,490	-0.5%	¥21M ($136K)
2026-06-02	SELL	unknown	佐藤雅彦	activist	548.2K	¥1,490	-0.5%	¥97M ($623K)
2026-06-02	SELL	unknown	佐藤公子	strategic	34.0K	¥1,490	-0.5%	¥6M ($36K)
2026-06-02	SELL	unknown	有限会社元気	other	1.2M	¥1,490	-0.5%	¥214M ($1.4M)
2025-09-26	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	354.2K	¥1,491	-	-
2025-09-26	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	355.2K	¥1,491	-	-
2025-09-26	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	79.3K	¥1,491	+0.4%	¥56M ($360K)
2025-09-26	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	114.0K	¥1,491	-	-
2024-10-29	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	114.0K	¥1,227	-	-
2024-10-29	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	355.2K	¥1,227	+22.0%	¥9M ($60K)
2024-10-29	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	42.3K	¥1,227	-	¥52M ($335K)
2024-10-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	354.2K	¥1,227	-	-
2024-06-25	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	354.2K	¥1,210	-	-
2024-06-25	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	347.7K	¥1,210	+23.7%	¥57M ($369K)
2024-06-25	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	114.0K	¥1,210	-	-
2022-01-18	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	354.2K	¥986	-51.8%	¥112M ($726K)
2022-01-18	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	300.3K	¥986	+51.8%	¥18M ($114K)
2022-01-18	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	114.0K	¥986	-	¥112M ($725K)
2021-11-29	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	282.5K	¥965	+55.1%	¥11M ($74K)
2021-11-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	468.2K	¥965	-	-
2021-10-19	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	468.2K	¥969	-	-
2021-10-19	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	270.8K	¥969	+54.5%	¥46M ($296K)
2021-07-15	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	468.2K	¥933	-	-
2021-07-15	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	223.4K	¥933	+60.5%	¥45M ($291K)

Frequently asked questions

Who has been buying TOSNET Corporation stock?: 4 distinct investors have filed 7 disclosed large-shareholding filings in TOSNET Corporation (4754), 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 TOSNET Corporation have?: TOSNET Corporation has 7 buy-side and 1 sell-side disclosures on record, covering ¥242M ($1.6M) in total reported value, spanning 2021-07-15 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.