Who has been buying Mynet Inc. stock?

5 distinct investors have filed 7 disclosed large-shareholding filings in Mynet Inc. (3928), most recently on 2025-12-12. 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 Mynet Inc. have?

Mynet Inc. has 7 buy-side and 8 sell-side disclosures on record, covering ¥559M ($3.6M) in total reported value, spanning 2021-11-19 to 2025-12-12.

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.

Mynet Inc. 3928

Company

株式会社マイネットMynet Inc.

Investors

Buys

Total Value

¥559M ($3.6M)

Avg Return

-46.07%

Last Filing

2025-12-12

Mynet Inc. (3928) has 7 disclosed large-shareholding filings and 8 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥559M ($3.6M) in reported transaction value. The earliest filing StockDrifts holds for Mynet Inc. is dated 2021-11-19; the most recent is 2025-12-12. Across these filings the average return since disclosure is -46.07%, 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
2026-07-21	BUY	private	株式会社Zero Gaming Zero Gaming Inc.	other	871.0K	¥226	+6.6%	¥197M ($1.3M)
2025-12-12	BUY	unknown	上原仁 Hitoshi Uehara	strategic	1.3M	¥249	-	-
2025-12-12	SELL	unknown	上原仁 Hitoshi Uehara	strategic	1.3M	¥249	+3.2%	¥25M ($161K)
2025-09-29	BUY	unknown	上原仁 Hitoshi Uehara	strategic	1.5M	¥246	-	¥55M ($354K)
2025-09-29	SELL	unknown	上原仁 Hitoshi Uehara	strategic	1.5M	¥246	+2.0%	¥55M ($354K)
2025-09-29	SELL	unknown	上原仁 Hitoshi Uehara	strategic	1.4M	¥246	+2.0%	¥26M ($170K)
2025-09-29	BUY	unknown	上原仁 Hitoshi Uehara	strategic	1.4M	¥246	-	¥26M ($170K)
2024-02-22	SELL	negotiated	上原仁 Hitoshi Uehara	activist	1.7M	¥407	+40.8%	¥57M ($371K)
2024-02-22	SELL	negotiated	上原仁 Hitoshi Uehara	activist	1.9M	¥407	+40.8%	¥37M ($240K)
2024-02-22	SELL	negotiated	上原仁 Hitoshi Uehara	activist	2.0M	¥407	+40.8%	¥28M ($181K)
2022-10-06	SELL	unknown	楽天証券株式会社 Rakuten Securities Inc	other	312.8K	¥480	+49.8%	¥75M ($483K)
2022-08-18	BUY	unknown	楽天証券株式会社 Rakuten Securities Inc	other	468.6K	¥513	-53.0%	¥240M ($1.6M)
2022-06-22	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	5.1K	¥484	-50.2%	¥502K ($3K)
2022-06-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	305.8K	¥484	-50.2%	¥5M ($33K)
2022-05-11	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	418.0K	¥513	-53.0%	¥446K ($3K)
2022-05-11	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	295.3K	¥513	-53.0%	¥92M ($596K)
2022-04-07	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	417.3K	¥541	-55.5%	¥226M ($1.5M)
2022-04-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	115.0K	¥541	-55.5%	¥62M ($401K)
2022-03-08	BUY	negotiated	上原仁 Hitoshi Uehara	activist	2.0M	¥473	-	-
2021-11-19	SELL	negotiated	上原仁 Jin Uehara	activist	2.0M	¥729	+66.9%	¥222M ($1.4M)

Frequently asked questions

Who has been buying Mynet Inc. stock?: 5 distinct investors have filed 7 disclosed large-shareholding filings in Mynet Inc. (3928), most recently on 2025-12-12. 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 Mynet Inc. have?: Mynet Inc. has 7 buy-side and 8 sell-side disclosures on record, covering ¥559M ($3.6M) in total reported value, spanning 2021-11-19 to 2025-12-12.
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.