Who has been buying bBreak Systems Company, Limited stock?

8 distinct investors have filed 13 disclosed large-shareholding filings in bBreak Systems Company, Limited (3986), most recently on 2026-01-08. 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 bBreak Systems Company, Limited have?

bBreak Systems Company, Limited has 13 buy-side and 4 sell-side disclosures on record, covering ¥101M ($654K) in total reported value, spanning 2021-11-30 to 2026-01-08.

Where does StockDrifts get bBreak Systems Company, Limited 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.

bBreak Systems Company, Limited 3986

Company

株式会社ビーブレイクシステムズbBreak Systems Company, Limited

Investors

Buys

Total Value

¥101M ($654K)

Avg Return

+3.25%

Last Filing

2026-01-08

bBreak Systems Company, Limited (3986) has 13 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥101M ($654K) in reported transaction value. The earliest filing StockDrifts holds for bBreak Systems Company, Limited is dated 2021-11-30; the most recent is 2026-01-08. 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 +3.25%, 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
2026-07-02	BUY	Market Buy	光通信株式会社	passive	344.1K	¥462	+5.2%	¥159M ($1.0M)
2026-07-02	BUY	Market Buy	株式会社UH5	passive	34.2K	¥462	+5.2%	¥16M ($102K)
2026-07-02	BUY	Market Buy	株式会社EPARK	passive	62.6K	¥462	+5.2%	¥21M ($136K)
2026-07-02	BUY	Market Buy	株式会社UH Partners 2	passive	84.4K	¥462	+5.2%	¥3M ($18K)
2026-01-08	BUY	Market Buy	株式会社EPARK	passive	5.7K	¥430	-21.2%	¥3M ($19K)
2026-01-08	BUY	Market Buy	株式会社UH5	passive	11.4K	¥430	-21.2%	¥6M ($38K)
2026-01-08	BUY	Market Buy	株式会社UH Partners 2	passive	26.1K	¥430	+21.2%	¥14M ($88K)
2026-01-08	BUY	Market Buy	光通信株式会社	passive	114.7K	¥430	-21.2%	¥60M ($386K)
2025-12-05	BUY	Market Buy	株式会社UH5	passive	11.4K	¥428.33	-21.6%	¥6M ($38K)
2025-12-05	BUY	Market Buy	株式会社UH Partners 2	passive	14.9K	¥428.33	-21.6%	¥8M ($50K)
2025-12-05	BUY	Market Buy	光通信株式会社	passive	114.7K	¥428.33	+21.6%	¥60M ($386K)
2025-12-01	SELL	unknown	白岩次郎 Jiro Shiraiwa	activist	491.2K	¥439.33	-18.6%	¥25M ($161K)
2025-12-01	SELL	unknown	上川伸彦 Nobuhiko Kamikawa	strategic	106.4K	¥439.33	-18.6%	¥9M ($60K)
2025-11-17	BUY	Market Buy	株式会社UH5 UH5 Co., Ltd.	passive	11.4K	¥476.67	+9.3%	¥1M ($8K)
2025-11-17	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	113.6K	¥476.67	+9.3%	¥6M ($40K)
2025-09-26	BUY	Market Buy	株式会社UH5 UH5 Co., Ltd.	passive	8.9K	¥507.67	+2.6%	¥5M ($29K)
2025-09-26	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	100.6K	¥507.67	+2.6%	¥2M ($14K)
2025-09-11	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	96.3K	¥497.67	+4.7%	¥8M ($52K)
2025-09-04	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	80.2K	¥474	+9.9%	¥38M ($245K)
2025-09-03	SELL	unknown	白岩次郎 Jiro Shiraiwa	activist	548.0K	¥470	-10.8%	¥67M ($434K)
2023-01-18	SELL	unknown	高橋明 Akira Takahashi	strategic	100.4K	¥472.67	-10.2%	¥5M ($35K)
2022-11-14	BUY	Market Buy	各務正人 KAKAMU MASATO	passive	142.0K	¥595.67	-12.5%	¥9M ($60K)
2022-11-07	BUY	Market Buy	各務正人 KAKAMU MASATO	passive	126.4K	¥570.67	-8.7%	¥9M ($60K)
2022-11-07	BUY	Market Buy	各務正人 KAKAMU MASATO	passive	110.0K	¥570.67	-8.7%	¥7M ($44K)
2022-11-04	BUY	Market Buy	各務正人 KAKAMU MASATO	passive	135.0K	¥591.67	-11.9%	¥22M ($141K)
2021-12-21	BUY	Market Buy	各務正人 KAKAMU MASATO	passive	110.0K	¥554.33	-6.0%	¥17M ($107K)
2021-12-21	BUY	Market Buy	各務正人 KAKAMU MASATO	passive	98.0K	¥554.33	-6.0%	¥10M ($64K)
2021-11-30	BUY	Market Buy	各務正人 KAKAMU MASATO	passive	80.0K	¥520	+0.2%	¥42M ($268K)

Frequently asked questions

Who has been buying bBreak Systems Company, Limited stock?: 8 distinct investors have filed 13 disclosed large-shareholding filings in bBreak Systems Company, Limited (3986), most recently on 2026-01-08. 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 bBreak Systems Company, Limited have?: bBreak Systems Company, Limited has 13 buy-side and 4 sell-side disclosures on record, covering ¥101M ($654K) in total reported value, spanning 2021-11-30 to 2026-01-08.
Where does StockDrifts get bBreak Systems Company, Limited 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 bBreak Systems Company, Limited. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.