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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
5
Buys
7
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. 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 +44.99%, measured from each filing date to the latest available close.

Price & insider activity (12 months)

Recent filings

DateTypeSourceInsiderPurposeSharesPrice at filingReturnValue
2026-06-12BUYMarket Buy
株式会社UH5
passive57.6K¥988+4.5%¥57M ($367K)
2026-06-12BUYMarket Buy
株式会社UH Partners 2
passive224.5K¥988+4.5%¥222M ($1.4M)
2026-06-12BUYMarket Buy
光通信株式会社
passive2.6M¥988+4.5%¥72M ($466K)
2025-09-29BUYMarket Buy
光通信株式会社
Hikari Tsushin K.K.
passive833.5K¥990-4.1%¥7M ($45K)
2025-09-11BUYMarket Buy
光通信株式会社
Hikari Tsushin K.K.
passive826.7K¥1,003.33-5.4%¥129M ($835K)
2025-07-24BUYMarket Buy
光通信株式会社
Hikari Tsushin K.K.
passive765.2K¥916.33+3.6%¥117M ($752K)
2025-01-27BUYMarket Buy
光通信株式会社
Hikari Tsushin K.K.
passive637.6K¥701.33+35.3%¥447M ($2.9M)
2024-04-30SELLMarket Buy
アミラル・ジェスチョン(AMIRAL GESTION)
AMIRAL GESTION
passive510.0K¥679.33-39.7%¥88M ($569K)
2023-12-05SELLMarket Buy
株式会社ケイ・ワイ 代表取締役 大和知世
KABUSHIKIGAISHA KEIWAI
passive536.0K¥700-35.6%¥92M ($592K)
2023-12-05BUYMarket Buy
株式会社ケイ・ワイ
KABUSHIKIGAISHA KEIWAI
passive536.0K¥700+35.6%¥92M ($592K)
2023-11-30BUYMarket Buy
株式会社ケイ・ワイ 代表取締役 大和知世
KABUSHIKIGAISHA KEIWAI
passive838.4K¥712.67+33.2%¥598M ($3.9M)
2022-07-14BUYMarket Buy
アミラル・ジェスチョン(AMIRAL GESTION)
AMIRAL GESTION
passive639.8K¥491.67+93.0%¥315M ($2.0M)
2022-03-23BUYunknown
ユービーエス・エイ・ジー(銀行)
UBS AG
other143.8K¥497.33+90.8%¥67M ($433K)
2022-03-22SELLunknown
株式会社ビジネスブレイン太田昭和
BUSINESS BRAIN SHOWA OTA INC.
unknown0¥479.33-98.0%¥2.2B ($14.3M)
2022-03-07BUYunknown
ユービーエス・エイ・ジー(銀行)
UBS AG
other899.6K¥470.33+101.8%¥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.
Where does StockDrifts get Business Brain Showa-Ota 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 Business Brain Showa-Ota Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.