Who has been buying Medical Net, Inc. stock?

3 distinct investors have filed 7 disclosed large-shareholding filings in Medical Net, Inc. (3645), most recently on 2025-10-31. 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 Medical Net, Inc. have?

Medical Net, Inc. has 7 buy-side and 3 sell-side disclosures on record, covering ¥317M ($2.0M) in total reported value, spanning 2021-07-01 to 2025-10-31.

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.

Medical Net, Inc. 3645

Company

株式会社メディカルネットMedical Net, Inc.

Investors

Buys

Total Value

¥317M ($2.0M)

Avg Return

-18.61%

Last Filing

2025-10-31

Medical Net, Inc. (3645) has 7 disclosed large-shareholding filings and 3 disclosed disposals on record, filed by 3 distinct investors. Together those filings cover ¥317M ($2.0M) in reported transaction value. The earliest filing StockDrifts holds for Medical Net, Inc. is dated 2021-07-01; the most recent is 2025-10-31. Across these filings the average return since disclosure is -18.61%, 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
2025-10-31	BUY	Market Buy	平川大 Hirakawa Dai	activist	886.5K	¥306	-15.4%	¥32M ($208K)
2025-10-31	BUY	negotiated	平川大 Hirakawa Dai	activist	886.5K	¥306	-	¥32M ($208K)
2024-12-19	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	451.6K	¥311	+16.7%	¥64M ($415K)
2024-10-21	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	658.2K	¥327	-20.8%	¥215M ($1.4M)
2024-05-21	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	477.3K	¥379	+31.7%	¥71M ($461K)
2023-11-21	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	665.8K	¥364	-28.9%	¥45M ($293K)
2023-10-19	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	540.6K	¥335	-22.7%	¥181M ($1.2M)
2023-10-05	SELL	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	454.1K	¥360	+28.1%	¥49M ($318K)
2023-07-21	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	591.2K	¥363	-28.6%	¥215M ($1.4M)
2022-10-05	BUY	Market Buy	平川裕司 Hirakawa Yuji	activist	783.5K	¥429	-39.6%	¥70M ($450K)
2021-09-30	BUY	Market Buy	平川大 Hirakawa Dai	activist	780.7K	¥581	-55.4%	¥93M ($602K)
2021-07-01	BUY	negotiated	平川裕司 Hirakawa Yuji	activist	310.3K	¥660	-	-
2021-07-01	BUY	negotiated	平川裕司 Hirakawa Yuji	activist	310.3K	¥660	-	¥205M ($1.3M)

Frequently asked questions

Who has been buying Medical Net, Inc. stock?: 3 distinct investors have filed 7 disclosed large-shareholding filings in Medical Net, Inc. (3645), most recently on 2025-10-31. 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 Medical Net, Inc. have?: Medical Net, Inc. has 7 buy-side and 3 sell-side disclosures on record, covering ¥317M ($2.0M) in total reported value, spanning 2021-07-01 to 2025-10-31.
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.