Who has been buying BENEFIT JAPAN Co., Ltd. stock?

16 distinct investors have filed 39 disclosed large-shareholding filings in BENEFIT JAPAN Co., Ltd. (3934), most recently on 2026-04-22. 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 BENEFIT JAPAN Co., Ltd. have?

BENEFIT JAPAN Co., Ltd. has 39 buy-side and 62 sell-side disclosures on record, covering ¥3.9B ($25.5M) in total reported value, spanning 2021-04-07 to 2026-04-22.

Where does StockDrifts get BENEFIT JAPAN Co., Ltd. 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.

BENEFIT JAPAN Co., Ltd. 3934

Company

株式会社ベネフィットジャパンBENEFIT JAPAN Co., Ltd.

Investors

Buys

Total Value

¥3.9B ($25.5M)

Avg Return

+12.12%

Last Filing

2026-04-22

BENEFIT JAPAN Co., Ltd. (3934) has 39 disclosed large-shareholding filings and 62 disclosed disposals on record, filed by 16 distinct investors. Together those filings cover ¥3.9B ($25.5M) in reported transaction value. The earliest filing StockDrifts holds for BENEFIT JAPAN Co., Ltd. is dated 2021-04-07; the most recent is 2026-04-22. 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 +12.12%, 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
2026-05-19	SELL	unknown	有限会社サクマジャパン	strategic	1.3M	¥2,161	-1.9%	¥1M ($8K)
2026-05-19	BUY	unknown	佐久間寛	activist	1.3M	¥2,161	+1.9%	¥2.9B ($18.7M)
2026-05-19	BUY	unknown	佐久間寛	activist	1.3M	¥2,161	+1.9%	¥2.9B ($18.7M)
2026-05-19	SELL	unknown	有限会社サクマジャパン	strategic	1.3M	¥2,161	-1.9%	¥1M ($8K)
2026-04-22	SELL	unknown	アセットマネジメントOne株式会社	unknown	0	¥1,920	-13.8%	¥13M ($82K)
2026-04-22	SELL	unknown	みずほ証券株式会社	other	450.0K	¥1,920	-13.8%	¥14M ($90K)
2026-04-02	BUY	Market Buy	佐久間範子	strategic	45.0K	¥1,801	+3.8%	¥81M ($523K)
2026-04-02	SELL	Market Buy	有限会社サクマジャパン	strategic	1.3M	¥1,801	-3.8%	¥8M ($49K)
2026-04-02	BUY	Market Buy	佐久間範子	strategic	45.0K	¥1,801	+3.8%	¥81M ($523K)
2026-04-02	SELL	Market Buy	有限会社サクマジャパン	strategic	1.3M	¥1,801	-3.8%	¥8M ($49K)
2026-04-02	BUY	Market Buy	佐久間寛	activist	1.3M	¥1,801	+3.8%	¥2M ($14K)
2026-04-02	BUY	Market Buy	佐久間寛	activist	1.3M	¥1,801	+3.8%	¥2M ($14K)
2026-03-24	BUY	Market Buy	株式会社UH6	passive	441.8K	¥1,940	+3.8%	¥825M ($5.3M)
2026-03-24	SELL	Market Buy	株式会社UH5	unknown	0	¥1,940	+3.8%	-
2026-03-24	BUY	Market Buy	株式会社アイビー	passive	131.7K	¥1,940	+3.8%	¥246M ($1.6M)
2026-03-24	BUY	Market Buy	株式会社エヌオーアイ	passive	447.1K	¥1,940	+3.8%	¥835M ($5.4M)
2026-03-24	BUY	Market Buy	株式会社エスアイエル	passive	97.2K	¥1,940	+3.8%	¥181M ($1.2M)
2026-03-24	BUY	Market Buy	株式会社UH Partners 3	passive	502.9K	¥1,940	+3.8%	¥939M ($6.1M)
2026-03-24	BUY	Market Buy	株式会社UH Partners 2	passive	411.6K	¥1,940	+3.8%	¥768M ($5.0M)
2026-03-24	BUY	Market Buy	光通信株式会社	passive	502.9K	¥1,940	+3.8%	¥939M ($6.1M)
2026-03-06	BUY	unknown	佐久間範子	strategic	45.0K	¥2,029	+8.0%	¥84M ($542K)
2026-03-06	BUY	unknown	有限会社サクマジャパン	strategic	1.3M	¥2,029	+8.0%	¥2.4B ($15.6M)
2026-03-06	SELL	unknown	佐久間寛	activist	1.3M	¥2,029	+8.0%	¥2.5B ($16.1M)
2025-12-23	SELL	Market Buy	株式会社UH5	passive	441.8K	¥1,760	-6.1%	¥825M ($5.3M)
2025-12-23	BUY	Market Buy	株式会社アイビー	passive	131.7K	¥1,760	-6.1%	¥246M ($1.6M)
2025-12-23	SELL	Market Buy	株式会社エヌオーアイ	passive	447.1K	¥1,760	-6.1%	¥835M ($5.4M)
2025-12-23	BUY	Market Buy	株式会社エスアイエル	passive	97.2K	¥1,760	-6.1%	¥181M ($1.2M)
2025-12-23	SELL	Market Buy	株式会社UH Partners 3	passive	502.9K	¥1,760	-6.1%	¥939M ($6.1M)
2025-12-23	BUY	Market Buy	株式会社UH Partners 2	passive	411.6K	¥1,760	-6.1%	¥768M ($5.0M)
2025-12-23	SELL	Market Buy	光通信株式会社	passive	502.9K	¥1,760	-6.1%	¥939M ($6.1M)
2025-10-03	SELL	unknown	佐久間寛 sakuma hiroshi	activist	1.3M	¥1,923	+2.9%	¥3M ($22K)
2025-10-03	BUY	unknown	佐久間範子 Noriko Sakuma	strategic	45.0K	¥1,923	-2.9%	¥87M ($558K)
2025-10-03	SELL	unknown	有限会社サクマジャパン Sakuma Japan Ltd.	strategic	1.3M	¥1,923	+2.9%	¥3M ($22K)
2025-09-26	BUY	Market Buy	株式会社UH5 UH5 Co., Ltd.	passive	441.8K	¥1,952	-4.3%	¥862M ($5.6M)
2025-09-26	BUY	Market Buy	株式会社アイビー IB, Inc.	passive	131.7K	¥1,952	-4.3%	¥257M ($1.7M)
2025-09-26	BUY	Market Buy	株式会社エヌオーアイ NIO Co., Ltd.	passive	447.1K	¥1,952	-4.3%	¥873M ($5.6M)
2025-09-26	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	97.2K	¥1,952	-4.3%	¥190M ($1.2M)
2025-09-26	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	502.9K	¥1,952	-4.3%	¥982M ($6.3M)
2025-09-26	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	411.6K	¥1,952	-4.3%	¥803M ($5.2M)
2025-09-26	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	502.9K	¥1,952	-4.3%	¥982M ($6.3M)
2025-06-06	BUY	Market Buy	株式会社UH5 UH5 Co., Ltd.	passive	441.8K	¥1,849	+1.0%	¥817M ($5.3M)
2025-06-06	BUY	Market Buy	株式会社アイビー IB, Inc.	passive	131.7K	¥1,849	+1.0%	¥169M ($1.1M)
2025-06-06	BUY	Market Buy	株式会社エヌオーアイ NIO Co., Ltd.	passive	447.1K	¥1,849	+1.0%	¥827M ($5.3M)
2025-06-06	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	97.2K	¥1,849	+1.0%	¥180M ($1.2M)
2025-06-06	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	502.9K	¥1,849	+1.0%	¥930M ($6.0M)
2025-06-06	SELL	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	411.6K	¥1,849	-1.0%	¥170M ($1.1M)
2025-06-06	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	502.9K	¥1,849	+1.0%	¥930M ($6.0M)
2025-04-30	SELL	Market Buy	株式会社エヌオーアイ NIO Co., Ltd.	passive	447.1K	¥1,117	-67.1%	¥671K ($4K)
2025-04-30	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	97.2K	¥1,117	+67.1%	¥109M ($700K)
2025-04-30	SELL	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	502.9K	¥1,117	-67.1%	¥671K ($4K)

Showing the 50 most recent of 200 filings.

Frequently asked questions

Who has been buying BENEFIT JAPAN Co., Ltd. stock?: 16 distinct investors have filed 39 disclosed large-shareholding filings in BENEFIT JAPAN Co., Ltd. (3934), most recently on 2026-04-22. 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 BENEFIT JAPAN Co., Ltd. have?: BENEFIT JAPAN Co., Ltd. has 39 buy-side and 62 sell-side disclosures on record, covering ¥3.9B ($25.5M) in total reported value, spanning 2021-04-07 to 2026-04-22.
Where does StockDrifts get BENEFIT JAPAN Co., Ltd. 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 BENEFIT JAPAN Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.