Who has been buying Business Brain Showa-Ota Inc. stock?

5 distinct investors have filed 7 disclosed large-shareholding filings in Business Brain Showa-Ota Inc. (9658), most recently on 2025-09-29. 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 Business Brain Showa-Ota Inc. have?

Business Brain Showa-Ota Inc. has 7 buy-side and 3 sell-side disclosures on record, covering ¥812M ($5.2M) in total reported value, spanning 2022-03-07 to 2025-09-29.

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.

Business Brain Showa-Ota Inc. 9658

Company

株式会社ビジネスブレイン太田昭和Business Brain Showa-Ota Inc.

Investors

Buys

Total Value

¥812M ($5.2M)

Avg Return

+44.99%

Last Filing

2025-09-29

Business Brain Showa-Ota Inc. (9658) has 7 disclosed large-shareholding filings and 3 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥812M ($5.2M) in reported transaction value. The earliest filing StockDrifts holds for Business Brain Showa-Ota Inc. is dated 2022-03-07; the most recent is 2025-09-29. Across these filings the average return since disclosure is +44.99%, 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
2026-06-12	BUY	Market Buy	株式会社UH5	passive	57.6K	¥988	-	¥57M ($367K)
2026-06-12	BUY	Market Buy	株式会社UH Partners 2	passive	224.5K	¥988	-	¥222M ($1.4M)
2026-06-12	BUY	Market Buy	光通信株式会社	passive	2.6M	¥988	+15.8%	¥72M ($466K)
2025-09-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	833.5K	¥990	+15.6%	¥7M ($45K)
2025-09-11	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	826.7K	¥1,003.33	+14.0%	¥129M ($835K)
2025-07-24	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	765.2K	¥916.33	+24.9%	¥117M ($752K)
2025-01-27	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	637.6K	¥701.33	+63.1%	¥447M ($2.9M)
2024-04-30	SELL	Market Buy	アミラル・ジェスチョン(AMIRAL GESTION) AMIRAL GESTION	passive	510.0K	¥679.33	-68.4%	¥88M ($569K)
2023-12-05	BUY	Market Buy	株式会社ケイ・ワイ KABUSHIKIGAISHA KEIWAI	passive	536.0K	¥700	-	¥92M ($592K)
2023-12-05	SELL	Market Buy	株式会社ケイ・ワイ代表取締役大和知世 KABUSHIKIGAISHA KEIWAI	passive	536.0K	¥700	-63.4%	¥92M ($592K)
2023-11-30	BUY	Market Buy	株式会社ケイ・ワイ代表取締役大和知世 KABUSHIKIGAISHA KEIWAI	passive	838.4K	¥712.67	-	¥598M ($3.9M)
2022-07-14	BUY	Market Buy	アミラル・ジェスチョン(AMIRAL GESTION) AMIRAL GESTION	passive	639.8K	¥491.67	+132.7%	¥315M ($2.0M)
2022-03-23	BUY	unknown	ユービーエス・エイ・ジー(銀行) UBS AG	other	143.8K	¥497.33	+130.0%	¥67M ($433K)
2022-03-22	SELL	unknown	株式会社ビジネスブレイン太田昭和 BUSINESS BRAIN SHOWA OTA INC.	unknown	0	¥479.33	-138.7%	¥2.2B ($14.3M)
2022-03-07	BUY	unknown	ユービーエス・エイ・ジー(銀行) UBS AG	other	899.6K	¥470.33	+143.2%	¥423M ($2.7M)

Frequently asked questions

Who has been buying Business Brain Showa-Ota Inc. stock?: 5 distinct investors have filed 7 disclosed large-shareholding filings in Business Brain Showa-Ota Inc. (9658), most recently on 2025-09-29. 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 Business Brain Showa-Ota Inc. have?: Business Brain Showa-Ota Inc. has 7 buy-side and 3 sell-side disclosures on record, covering ¥812M ($5.2M) in total reported value, spanning 2022-03-07 to 2025-09-29.
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.