Who has been buying BrainPad Inc. stock?

17 distinct investors have filed 59 disclosed large-shareholding filings in BrainPad Inc. (3655), most recently on 2026-01-09. 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 BrainPad Inc. have?

BrainPad Inc. has 59 buy-side and 47 sell-side disclosures on record, covering ¥119.8B ($773.2M) in total reported value, spanning 2021-04-07 to 2026-01-09.

Where does StockDrifts get BrainPad Inc. insider data?

From EDINET large-shareholding (5%+) reports — the official filing system run by the Financial Services Agency (Japan). StockDrifts parses each disclosure and matches it to daily price history; the original filings remain available directly from EDINET.

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.

BrainPad Inc. 3655

Company

株式会社ブレインパッドBrainPad Inc.

Investors

Buys

Total Value

¥119.8B ($773.2M)

Avg Return

+82.33%

Last Filing

2026-01-09

BrainPad Inc. (3655) has 59 disclosed large-shareholding filings and 47 disclosed disposals on record, filed by 17 distinct investors. Together those filings cover ¥119.8B ($773.2M) in reported transaction value. The earliest filing StockDrifts holds for BrainPad Inc. is dated 2021-04-07; the most recent is 2026-01-09. All of it is parsed from EDINET large-shareholding (5%+) reports, the official disclosure system operated by the Financial Services Agency (Japan). Across these filings the average return since disclosure is +82.33%, 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
2026-01-09	SELL	unknown	野村アセットマネジメント株式会社	other	81.5K	¥2,690	-0.1%	¥219M ($1.4M)
2026-01-09	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	27.6K	¥2,690	-0.1%	¥74M ($480K)
2026-01-09	BUY	unknown	野村證券株式会社	other	102.8K	¥2,690	+0.1%	¥277M ($1.8M)
2026-01-06	BUY	unknown	ジェー・ピー・モルガン・セキュリティーズ・ピーエルシー J.P. Morgan Securities plc	other	67.8K	¥2,690	+0.1%	¥182M ($1.2M)
2026-01-06	SELL	unknown	JPモルガン証券株式会社	other	1.5K	¥2,690	-0.1%	¥4M ($26K)
2025-12-22	SELL	unknown	野村證券株式会社	other	27.1K	¥2,740	+1.7%	¥73M ($472K)
2025-12-22	BUY	unknown	野村アセットマネジメント株式会社	other	358.5K	¥2,740	-1.7%	¥965M ($6.2M)
2025-12-22	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	1.4M	¥2,740	+1.7%	¥3.8B ($24.6M)
2025-12-22	SELL	unknown	アセットマネジメントOne株式会社	other	263.9K	¥2,740	+1.7%	¥711M ($4.6M)
2025-12-22	SELL	unknown	みずほ証券株式会社	other	20.9K	¥2,740	+1.7%	¥56M ($363K)
2025-12-19	BUY	acquisition	高橋隆史	unknown	12.2K	¥2,844	-5.3%	¥33M ($212K)
2025-12-19	SELL	Market Buy	株式会社ディシプリン	other	0	¥2,844	+5.3%	-
2025-12-19	SELL	Market Buy	高橋隆史	activist	12.2K	¥2,844	+5.3%	¥33M ($212K)
2025-12-19	BUY	acquisition	富士通株式会社	activist	18.0M	¥2,844	-5.3%	¥48.6B ($313.5M)
2025-12-19	BUY	Market Buy	佐藤清之輔 Seinosuke Sato	activist	18.1M	¥2,844	-5.3%	¥46.5B ($300.3M)
2025-12-18	SELL	Market Buy	ジェー・ピー・モルガン・セキュリティーズ・ピーエルシー J.P. Morgan Securities plc	other	35.3K	¥2,688	-0.2%	¥95M ($614K)
2025-12-18	BUY	Market Buy	JPモルガン証券株式会社	other	1.3M	¥2,688	+0.2%	¥3.5B ($22.7M)
2025-12-11	BUY	negotiated	株式会社ディシプリン	activist	2.4M	¥2,701	+0.3%	¥6.3B ($40.9M)
2025-12-11	BUY	negotiated	高橋隆史	activist	268.2K	¥2,701	+0.3%	¥722M ($4.7M)
2025-12-08	BUY	negotiated	株式会社ディシプリン	activist	2.4M	¥2,701	+0.3%	¥6.3B ($40.9M)
2025-12-08	BUY	negotiated	高橋隆史	activist	268.2K	¥2,701	+0.3%	¥722M ($4.7M)
2025-12-08	BUY	negotiated	佐藤清之輔 Seinosuke Sato	activist	1.7M	¥2,701	-0.3%	¥4.6B ($29.5M)
2025-12-05	BUY	negotiated	佐藤清之輔 Seinosuke Sato	activist	1.7M	¥2,700	-0.3%	¥4.6B ($29.5M)
2025-12-05	BUY	unknown	アセットマネジメントOne株式会社	other	265.9K	¥2,700	-0.3%	¥716M ($4.6M)
2025-12-05	BUY	unknown	みずほ証券株式会社	other	875.7K	¥2,700	-0.3%	¥2.4B ($15.2M)
2025-12-03	SELL	Market Buy	野村アセットマネジメント株式会社	other	355.6K	¥2,700	+0.3%	¥958M ($6.2M)
2025-12-03	BUY	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	1.7M	¥2,700	-0.3%	¥4.6B ($29.5M)
2025-12-03	SELL	Market Buy	野村證券株式会社	other	28.8K	¥2,700	+0.3%	¥78M ($500K)
2025-12-03	BUY	unknown	ジェー・ピー・モルガン・セキュリティーズ・ピーエルシー J.P. Morgan Securities plc	other	101.5K	¥2,700	+0.3%	¥273M ($1.8M)
2025-12-03	SELL	unknown	JPモルガン証券株式会社	other	1.2M	¥2,700	+0.3%	¥3.3B ($21.3M)
2025-11-26	BUY	negotiated	佐藤清之輔 Seinosuke Sato	activist	1.7M	¥2,699	-0.2%	¥4.6B ($29.5M)
2025-11-21	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	750.6K	¥2,699	-0.2%	¥1.9B ($12.3M)
2025-11-21	BUY	negotiated	佐藤清之輔 Seinosuke Sato	activist	1.7M	¥2,699	-0.2%	¥4.6B ($29.5M)
2025-11-21	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	315.4K	¥2,699	+0.2%	¥3.7B ($23.7M)
2025-11-21	BUY	negotiated	佐藤清之輔 Seinosuke Sato	activist	1.7M	¥2,699	-0.2%	¥4.6B ($29.5M)
2025-11-20	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	357.5K	¥2,699	-0.2%	¥965M ($6.2M)
2025-11-20	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	1.0M	¥2,699	-0.2%	¥2.8B ($17.8M)
2025-11-20	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	76.4K	¥2,699	-0.2%	¥206M ($1.3M)
2025-11-19	BUY	unknown	ジェー・ピー・モルガン・セキュリティーズ・ピーエルシー J.P. Morgan Securities plc	other	103.2K	¥2,699	-0.2%	¥279M ($1.8M)
2025-11-19	BUY	unknown	JPモルガン証券株式会社 JPMorgan Securities Japan Co., Ltd.	other	1.2M	¥2,699	-0.2%	¥3.3B ($21.5M)
2025-11-06	BUY	Market Buy	株式会社ディシプリン Discipline Co., Ltd.	activist	2.4M	¥2,695	-0.1%	¥6.3B ($40.9M)
2025-11-06	BUY	Market Buy	佐藤清之輔 Seinosuke Sato	activist	1.7M	¥2,695	-0.1%	¥6M ($39K)
2025-11-06	BUY	Market Buy	佐藤清之輔 Seinosuke Sato	activist	1.7M	¥2,695	-0.1%	¥12M ($78K)
2025-11-06	BUY	Market Buy	高橋隆史 Takafumi Takahashi	activist	268.2K	¥2,695	-0.1%	¥6M ($39K)
2025-09-22	BUY	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	12.0K	¥1,414	+90.5%	¥1.5B ($9.7M)
2025-09-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	41.6K	¥1,414	-90.5%	¥69M ($448K)
2025-09-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.7M	¥1,414	-90.5%	¥382M ($2.5M)
2025-08-22	BUY	negotiated	佐藤清之輔 Seinosuke Sato	activist	1.7M	¥1,266	+112.7%	¥2.1B ($13.8M)
2025-08-22	BUY	Market Buy	佐藤清之輔 Seinosuke Sato	activist	1.7M	¥1,266	+112.7%	¥6M ($36K)
2025-08-21	SELL	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	46.0K	¥1,247	-116.0%	¥6M ($36K)

Showing the 50 most recent of 134 filings.

Frequently asked questions

Who has been buying BrainPad Inc. stock?: 17 distinct investors have filed 59 disclosed large-shareholding filings in BrainPad Inc. (3655), most recently on 2026-01-09. 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 BrainPad Inc. have?: BrainPad Inc. has 59 buy-side and 47 sell-side disclosures on record, covering ¥119.8B ($773.2M) in total reported value, spanning 2021-04-07 to 2026-01-09.
Where does StockDrifts get BrainPad Inc. insider data?: From EDINET large-shareholding (5%+) reports — the official filing system run by the Financial Services Agency (Japan). StockDrifts parses each disclosure and matches it to daily price history; the original filings remain available directly from EDINET.
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.

Source filings

Every trade listed above is disclosed in EDINET large-shareholding (5%+) reports, filed with the Financial Services Agency (Japan). View the original EDINET filings for BrainPad Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.