Who has been buying ZUU Co.,Ltd. stock?

6 distinct investors have filed 17 disclosed large-shareholding filings in ZUU Co.,Ltd. (4387), most recently on 2026-03-05. 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 ZUU Co.,Ltd. have?

ZUU Co.,Ltd. has 17 buy-side and 9 sell-side disclosures on record, covering ¥1.7B ($10.8M) in total reported value, spanning 2021-06-07 to 2026-03-05.

Where does StockDrifts get ZUU 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.

ZUU Co.,Ltd. 4387

Company

株式会社ZUUZUU Co.,Ltd.

Investors

Buys

Total Value

¥1.7B ($10.8M)

Avg Return

-42.59%

Last Filing

2026-03-05

ZUU Co.,Ltd. (4387) has 17 disclosed large-shareholding filings and 9 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥1.7B ($10.8M) in reported transaction value. The earliest filing StockDrifts holds for ZUU Co.,Ltd. is dated 2021-06-07; the most recent is 2026-03-05. 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 -42.59%, 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
2026-07-14	BUY	unknown	トミーアセットマネジメント株式会社	activist	113.3K	¥485	-2.3%	¥55M ($355K)
2026-07-14	BUY	negotiated	冨田和成	activist	2.4M	¥485	-2.3%	¥1.2B ($7.5M)
2026-03-05	BUY	Market Buy	株式会社ACNグループ ACN Group Inc.	strategic	427.5K	¥683	-18.3%	¥26M ($170K)
2025-07-15	BUY	Market Buy	株式会社ACNホールディングス ACN Holdings Inc.	strategic	388.9K	¥723	-22.8%	¥37M ($239K)
2025-07-14	BUY	negotiated	トミーアセットマネジメント株式会社 Tomy Asset Management Co., Ltd.	activist	113.3K	¥715	-22.0%	¥81M ($523K)
2025-07-14	BUY	negotiated	冨田和成 Kazumasa Tomita	activist	2.4M	¥715	-22.0%	¥1.7B ($11.1M)
2025-04-18	BUY	Market Buy	株式会社ACNホールディングス ACN Holdings Inc.	strategic	337.8K	¥709	-21.3%	¥34M ($222K)
2025-04-01	BUY	Market Buy	株式会社ACNホールディングス ACN Holdings Inc.	strategic	289.5K	¥796	-29.9%	¥38M ($244K)
2025-02-19	BUY	negotiated	トミーアセットマネジメント株式会社 Tomy Asset Management Co., Ltd.	activist	113.3K	¥824	-32.3%	¥93M ($602K)
2025-02-19	BUY	negotiated	冨田和成 Kazumasa Tomita	activist	2.4M	¥824	-32.3%	¥2.0B ($12.8M)
2025-02-19	BUY	negotiated	冨田和成 Kazumasa Tomita	activist	2.4M	¥824	-32.3%	¥2.0B ($12.8M)
2025-02-19	BUY	negotiated	トミーアセットマネジメント株式会社 Tomy Asset Management Co., Ltd.	activist	113.3K	¥824	-32.3%	¥93M ($602K)
2025-01-10	BUY	Market Buy	株式会社ACNホールディングス ACN Holdings Inc.	strategic	241.9K	¥765	-27.1%	¥3M ($21K)
2025-01-10	BUY	unknown	株式会社ACNホールディングス ACN Holdings Inc.	strategic	241.9K	¥765	-27.1%	¥3M ($21K)
2024-12-06	BUY	unknown	株式会社ACNホールディングス ACN Holdings Inc.	strategic	237.5K	¥700	-20.3%	¥166M ($1.1M)
2024-12-06	BUY	unknown	株式会社ACNホールディングス ACN Holdings Inc.	strategic	237.5K	¥700	-20.3%	¥166M ($1.1M)
2024-12-06	SELL	negotiated	冨田和成 Kazumasa Tomita	activist	2.4M	¥700	+20.3%	¥174M ($1.1M)
2024-12-06	SELL	negotiated	冨田和成 Kazumasa Tomita	activist	2.4M	¥700	+20.3%	¥174M ($1.1M)
2024-12-06	BUY	negotiated	トミーアセットマネジメント株式会社 Tomy Asset Management Co., Ltd.	activist	113.3K	¥700	-20.3%	¥79M ($512K)
2024-12-06	BUY	negotiated	トミーアセットマネジメント株式会社 Tomy Asset Management Co., Ltd.	activist	113.3K	¥700	-20.3%	¥79M ($512K)
2024-04-17	BUY	negotiated	冨田和成 Kazumasa Tomita	activist	2.7M	¥976	-42.8%	¥2.6B ($16.7M)
2024-04-17	BUY	negotiated	トミーアセットマネジメント株式会社 Tomy Asset Management Co., Ltd.	activist	113.3K	¥976	-42.8%	¥111M ($713K)
2024-04-17	BUY	negotiated	トミーアセットマネジメント株式会社 Tomy Asset Management Co., Ltd.	activist	113.3K	¥976	-42.8%	¥111M ($713K)
2024-04-17	BUY	negotiated	冨田和成 Kazumasa Tomita	activist	2.7M	¥976	-42.8%	¥2.6B ($16.7M)
2024-03-07	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	30.6K	¥1,116	-50.0%	¥34M ($220K)
2024-03-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	176.0K	¥1,116	-50.0%	¥194M ($1.2M)
2024-03-06	BUY	negotiated	冨田和成 Kazumasa Tomita	activist	2.7M	¥1,150	-51.5%	¥3.1B ($19.7M)
2024-03-06	BUY	negotiated	トミーアセットマネジメント株式会社 Tomy Asset Management Co., Ltd.	activist	113.3K	¥1,150	-51.5%	¥130M ($841K)
2024-02-07	BUY	negotiated	冨田和成 Kazumasa Tomita	activist	2.7M	¥759	-26.5%	¥2.0B ($13.0M)
2024-02-07	BUY	negotiated	トミーアセットマネジメント株式会社 Tomy Asset Management Co., Ltd.	activist	113.3K	¥759	-26.5%	¥86M ($555K)
2024-01-10	BUY	negotiated	トミーアセットマネジメント株式会社 Tomy Asset Management Co., Ltd.	activist	113.3K	¥700	-20.3%	¥79M ($512K)
2024-01-10	BUY	negotiated	冨田和成 Kazumasa Tomita	activist	2.7M	¥700	-20.3%	¥1.9B ($12.0M)
2023-12-26	BUY	negotiated	トミーアセットマネジメント株式会社 Tomy Asset Management Co., Ltd.	activist	113.3K	¥659	-15.3%	¥75M ($482K)
2023-12-26	BUY	negotiated	冨田和成 Kazumasa Tomita	activist	2.7M	¥659	-15.3%	¥1.7B ($11.3M)
2023-12-06	BUY	negotiated	冨田和成 Kazumasa Tomita	activist	2.7M	¥672	-17.0%	¥1.8B ($11.5M)
2023-12-06	BUY	negotiated	トミーアセットマネジメント株式会社 Tomy Asset Management Co., Ltd.	activist	113.3K	¥672	-17.0%	¥44M ($284K)
2023-11-24	BUY	negotiated	トミーアセットマネジメント株式会社 Tomy Asset Management Co., Ltd.	activist	47.9K	¥600	-7.0%	¥29M ($185K)
2023-11-24	BUY	negotiated	冨田和成 Kazumasa Tomita	activist	2.7M	¥600	-7.0%	¥1.6B ($10.3M)
2023-10-06	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	261.8K	¥613	+9.0%	¥29M ($188K)
2023-08-23	BUY	negotiated	冨田和成 Kazumasa Tomita	activist	2.7M	¥662	-15.7%	¥1.8B ($11.3M)
2023-08-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	unknown	0	¥660	+15.4%	¥14M ($93K)
2023-08-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	309.3K	¥660	-15.4%	¥202M ($1.3M)
2023-07-24	BUY	negotiated	冨田和成 Kazumasa Tomita	activist	2.7M	¥696	-19.8%	¥1.8B ($11.9M)
2023-07-04	BUY	negotiated	冨田和成 Kazumasa Tomita	activist	2.7M	¥717	-22.2%	¥1.9B ($12.3M)
2023-06-23	BUY	negotiated	冨田和成 Kazumasa Tomita	activist	2.7M	¥766	-27.1%	¥2.0B ($13.1M)
2023-06-12	SELL	negotiated	冨田和成 Kazumasa Tomita	activist	2.7M	¥741	+24.7%	¥35M ($225K)
2022-11-08	BUY	negotiated	冨田和成 Kazumasa Tomita	activist	2.7M	¥1,015	-45.0%	¥2.7B ($17.7M)
2022-10-05	BUY	negotiated	冨田和成 Kazumasa Tomita	activist	2.7M	¥1,007	-44.6%	¥2.7B ($17.5M)
2022-08-19	BUY	negotiated	冨田和成 Kazumasa Tomita	activist	2.7M	¥1,006	-44.5%	¥2.7B ($17.5M)
2022-07-01	BUY	Market Buy	冨田和成 Kazumasa Tomita	activist	2.7M	¥1,100	-49.3%	¥30M ($192K)

Showing the 50 most recent of 62 filings.

Frequently asked questions

Who has been buying ZUU Co.,Ltd. stock?: 6 distinct investors have filed 17 disclosed large-shareholding filings in ZUU Co.,Ltd. (4387), most recently on 2026-03-05. 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 ZUU Co.,Ltd. have?: ZUU Co.,Ltd. has 17 buy-side and 9 sell-side disclosures on record, covering ¥1.7B ($10.8M) in total reported value, spanning 2021-06-07 to 2026-03-05.
Where does StockDrifts get ZUU 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 ZUU Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.