Who has been buying gumi Inc. stock?

10 distinct investors have filed 18 disclosed large-shareholding filings in gumi Inc. (3903), most recently on 2026-01-14. 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 gumi Inc. have?

gumi Inc. has 18 buy-side and 25 sell-side disclosures on record, covering ¥26.1B ($168.6M) in total reported value, spanning 2021-06-16 to 2026-01-14.

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.

gumi Inc. 3903

Company

株式会社gumigumi Inc.

Investors

Buys

Total Value

¥26.1B ($168.6M)

Avg Return

-47.00%

Last Filing

2026-01-14

gumi Inc. (3903) has 18 disclosed large-shareholding filings and 25 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥26.1B ($168.6M) in reported transaction value. The earliest filing StockDrifts holds for gumi Inc. is dated 2021-06-16; the most recent is 2026-01-14. Across these filings the average return since disclosure is -47.00%, 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
2026-07-06	SELL	Market Buy	SBIホールディングス株式会社	activist	16.5M	¥251	+18.7%	¥42M ($271K)
2026-07-06	SELL	unknown	株式会社SBI証券	other	87	¥251	+18.7%	¥1.5B ($10.0M)
2026-01-14	SELL	Market Buy	SBIホールディングス株式会社	passive	16.5M	¥394	+48.2%	¥97M ($624K)
2026-01-14	SELL	Market Buy	株式会社SBI証券	other	6.9M	¥394	+48.2%	¥273M ($1.8M)
2026-01-09	SELL	Market Buy	SBIホールディングス株式会社	passive	16.5M	¥371	+45.0%	¥138M ($893K)
2026-01-09	SELL	Market Buy	株式会社SBI証券	other	7.7M	¥371	+45.0%	¥376M ($2.4M)
2026-01-05	SELL	Market Buy	SBIホールディングス株式会社	passive	16.5M	¥361	+43.5%	¥72M ($467K)
2026-01-05	SELL	Market Buy	株式会社SBI証券	other	8.8M	¥361	+43.5%	¥186M ($1.2M)
2025-12-04	SELL	Market Buy	株式会社SBI証券	other	9.4M	¥378	+46.0%	¥205M ($1.3M)
2025-12-04	SELL	Market Buy	SBIホールディングス株式会社	passive	16.5M	¥378	+46.0%	¥79M ($508K)
2025-11-17	SELL	Market Buy	SBIホールディングス株式会社 SBI Holdings, Inc.	passive	16.5M	¥396	+48.5%	¥81M ($525K)
2025-11-17	SELL	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	10.1M	¥396	+48.5%	¥205M ($1.3M)
2025-10-27	SELL	Market Buy	SBIホールディングス株式会社 SBI Holdings, Inc.	passive	16.5M	¥467	+56.3%	¥7M ($45K)
2025-10-27	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	10.7M	¥467	-	¥5.0B ($32.2M)
2025-06-30	SELL	unknown	SUPER STATE HOLDINGS株式会社代表取締役柏原真人 SUPER STATE HOLDINGS Inc	unknown	3.4M	¥700	+70.9%	¥4.6B ($29.4M)
2025-06-27	BUY	Market Buy	SBIホールディングス株式会社 SBI Holdings, Inc.	passive	16.5M	¥660	-69.1%	¥4.3B ($28.0M)
2024-09-19	SELL	Market Buy	SBIホールディングス株式会社 SBI Holdings, Inc.	passive	9.9M	¥363	+43.8%	¥440M ($2.8M)
2024-07-25	BUY	unknown	SUPER STATE HOLDINGS株式会社代表取締役柏原真人 SUPER STATE HOLDINGS Inc	strategic	9.9M	¥318	-35.9%	¥3.1B ($20.3M)
2024-06-19	SELL	unknown	NEXT BIG THING株式会社 NEXT BIG THING Co., Ltd.	strategic	1.1M	¥329	+38.0%	¥90M ($580K)
2024-06-19	SELL	unknown	國光宏尚 Hironao Kunimitsu	strategic	806.1K	¥329	+38.0%	¥92M ($597K)
2023-08-07	SELL	unknown	國光宏尚 Hironao Kunimitsu	strategic	1.1M	¥678	+69.9%	¥196M ($1.3M)
2023-08-07	SELL	unknown	NEXT BIG THING株式会社 NEXT BIG THING Co., Ltd.	strategic	1.4M	¥678	+69.9%	¥252M ($1.6M)
2023-08-07	SELL	unknown	NEXT BIG THING株式会社 NEXT BIG THING Co., Ltd.	strategic	1.4M	¥678	+69.9%	¥252M ($1.6M)
2023-08-07	SELL	unknown	國光宏尚 Hironao Kunimitsu	strategic	1.1M	¥678	+69.9%	¥196M ($1.3M)
2023-02-09	BUY	Market Buy	SBIホールディングス株式会社 SBI Holdings Co., Ltd.	passive	8.8M	¥825	-	-
2023-02-09	SELL	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	87	¥825	+75.3%	¥437M ($2.8M)
2023-02-06	BUY	Market Buy	SBIホールディングス株式会社 SBI Holdings Co., Ltd.	passive	8.8M	¥850	-	-
2023-02-06	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	528.0K	¥850	-76.0%	¥33M ($215K)
2023-01-19	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	1.2M	¥900	+77.3%	¥286M ($1.8M)
2023-01-19	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	452.8K	¥900	+77.3%	¥106M ($683K)
2023-01-18	BUY	Market Buy	SBIホールディングス株式会社 SBI Holdings Co., Ltd.	passive	8.8M	¥928	-78.0%	¥8.2B ($52.7M)
2023-01-18	BUY	Market Buy	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	490.5K	¥928	-78.0%	¥455M ($2.9M)
2022-12-06	BUY	Market Buy	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	1.2M	¥721	-71.7%	¥20M ($131K)
2022-12-06	BUY	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	455.8K	¥721	-71.7%	¥27M ($175K)
2022-09-06	BUY	unknown	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	1.2M	¥799	-74.5%	¥970M ($6.3M)
2022-09-06	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	419.2K	¥799	-74.5%	¥335M ($2.2M)
2022-06-07	BUY	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	1.1M	¥547	-62.7%	¥590M ($3.8M)
2022-06-07	BUY	unknown	ベイリー・ギフォード・オーバーシーズ・リミテッド Baillie Gifford Overseas Limited	other	32.5K	¥547	-	-
2022-05-19	BUY	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	1.6M	¥522	-60.9%	¥826M ($5.3M)
2022-05-19	BUY	unknown	ベイリー・ギフォード・オーバーシーズ・リミテッド Baillie Gifford Overseas Limited	other	32.5K	¥522	-	-
2022-04-07	BUY	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	1.9M	¥608	-66.5%	¥1.2B ($7.5M)
2022-04-07	SELL	unknown	ベイリー・ギフォード・オーバーシーズ・リミテッド Baillie Gifford Overseas Limited	other	32.5K	¥608	+66.5%	¥32M ($209K)
2022-02-21	BUY	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	2.3M	¥543	-62.4%	¥1.2B ($8.0M)
2022-02-21	BUY	unknown	ベイリー・ギフォード・オーバーシーズ・リミテッド Baillie Gifford Overseas Limited	other	85.2K	¥543	-	-
2022-02-02	BUY	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	2.7M	¥589	-65.4%	¥1.5B ($10.0M)
2022-02-02	BUY	unknown	ベイリー・ギフォード・オーバーシーズ・リミテッド Baillie Gifford Overseas Limited	other	85.2K	¥589	-	-
2021-12-17	BUY	unknown	ベイリー・ギフォード・オーバーシーズ・リミテッド Baillie Gifford Overseas Limited	other	85.2K	¥710	-71.3%	¥7M ($43K)
2021-12-17	BUY	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	3.2M	¥710	-71.3%	¥2.3B ($14.6M)
2021-07-02	BUY	unknown	國光宏尚 Hironao Kunimitsu	strategic	1.1M	¥833	-	-
2021-07-02	BUY	unknown	國光宏尚 Hironao Kunimitsu	strategic	1.1M	¥833	-75.5%	¥878M ($5.7M)

Showing the 50 most recent of 54 filings.

Frequently asked questions

Who has been buying gumi Inc. stock?: 10 distinct investors have filed 18 disclosed large-shareholding filings in gumi Inc. (3903), most recently on 2026-01-14. 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 gumi Inc. have?: gumi Inc. has 18 buy-side and 25 sell-side disclosures on record, covering ¥26.1B ($168.6M) in total reported value, spanning 2021-06-16 to 2026-01-14.
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.