Who has been buying istyle Inc. stock?

19 distinct investors have filed 42 disclosed large-shareholding filings in istyle Inc. (3660), most recently on 2026-05-12. 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 istyle Inc. have?

istyle Inc. has 42 buy-side and 57 sell-side disclosures on record, covering ¥52.1B ($336.0M) in total reported value, spanning 2021-04-06 to 2026-05-12.

Where does StockDrifts get istyle 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.

istyle Inc. 3660

Company

株式会社アイスタイルistyle Inc.

Investors

Buys

Total Value

¥52.1B ($336.0M)

Avg Return

+8.52%

Last Filing

2026-05-12

istyle Inc. (3660) has 42 disclosed large-shareholding filings and 57 disclosed disposals on record, filed by 19 distinct investors. Together those filings cover ¥52.1B ($336.0M) in reported transaction value. The earliest filing StockDrifts holds for istyle Inc. is dated 2021-04-06; the most recent is 2026-05-12. 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 +8.52%, 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
2026-07-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	5.2M	¥400	+6.5%	¥2.1B ($13.5M)
2026-07-07	BUY	unknown	株式会社三井住友銀行	other	1.0M	¥400	+6.5%	¥400M ($2.6M)
2026-07-07	BUY	Market Buy	三井住友DSアセットマネジメント株式会社	passive	4.3M	¥400	+6.5%	¥1.7B ($11.2M)
2026-07-07	BUY	unknown	SMBC日興証券株式会社	other	531.7K	¥400	+6.5%	¥213M ($1.4M)
2026-07-02	SELL	unknown	株式会社ワイ	activist	12.2M	¥390	-13.3%	¥52M ($336K)
2026-07-02	SELL	unknown	吉松徹郎	activist	7.6M	¥390	-13.3%	¥96M ($620K)
2026-05-12	SELL	unknown	みずほ証券株式会社	other	42.6K	¥412	+5.3%	¥30M ($191K)
2026-05-12	SELL	unknown	アセットマネジメントOne株式会社	other	5.1M	¥412	+5.3%	¥689M ($4.4M)
2026-03-19	SELL	unknown	ソシエテジェネラル	other	3.0M	¥419	-15.0%	¥1.4B ($9.2M)
2026-03-19	SELL	unknown	ソシエテ・ジェネラル証券株式会社	other	1.3M	¥419	-15.0%	¥620M ($4.0M)
2026-03-19	BUY	unknown	ソシエテジェネラル	other	3.0M	¥419	-15.0%	¥1.4B ($9.2M)
2026-03-19	BUY	unknown	ソシエテ・ジェネラル証券株式会社	other	1.3M	¥419	-15.0%	¥620M ($4.0M)
2026-03-05	BUY	unknown	ソシエテジェネラル	other	4.1M	¥448	+7.6%	¥2.0B ($12.6M)
2026-03-05	BUY	unknown	ソシエテ・ジェネラル証券株式会社	other	1.3M	¥448	+7.6%	¥623M ($4.0M)
2026-03-05	BUY	unknown	ソシエテジェネラル	other	4.1M	¥448	+7.6%	¥2.0B ($12.6M)
2026-03-05	BUY	unknown	ソシエテ・ジェネラル証券株式会社	other	1.3M	¥448	+7.6%	¥623M ($4.0M)
2025-10-10	BUY	unknown	株式会社ワイ kabushikikaisha wai	activist	12.2M	¥465	+3.7%	¥5.7B ($36.7M)
2025-10-10	BUY	unknown	吉松徹郎 Tetsuro Yoshimatsu	activist	7.6M	¥465	+3.7%	¥3.5B ($22.9M)
2025-10-07	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	109.2K	¥469	+2.8%	¥51M ($330K)
2025-10-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	6.4M	¥469	-2.8%	¥490M ($3.2M)
2025-09-16	SELL	unknown	株式会社ワイ kabushikikaisha wai	activist	12.2M	¥514	+6.2%	¥347M ($2.2M)
2025-09-16	SELL	unknown	吉松徹郎 Tetsuro Yoshimatsu	activist	7.6M	¥514	+6.2%	¥226M ($1.5M)
2025-09-11	SELL	unknown	三井物産株式会社 Mitsui & Co., LTD.	activist	5.7M	¥519	+7.1%	¥840M ($5.4M)
2025-09-01	BUY	unknown	吉松徹郎 Tetsuro Yoshimatsu	activist	7.6M	¥614	-21.5%	¥4.7B ($30.2M)
2025-09-01	SELL	unknown	株式会社ワイ kabushikikaisha wai	activist	12.2M	¥614	+21.5%	¥6M ($36K)
2025-09-01	BUY	unknown	株式会社ワイ kabushikikaisha wai	activist	12.2M	¥614	-21.5%	¥7.5B ($48.5M)
2025-09-01	BUY	unknown	株式会社ワイ kabushikikaisha wai	activist	12.2M	¥614	-21.5%	¥7.5B ($48.5M)
2025-09-01	SELL	unknown	株式会社ワイ kabushikikaisha wai	activist	12.2M	¥614	+21.5%	¥368M ($2.4M)
2025-09-01	BUY	unknown	吉松徹郎 Tetsuro Yoshimatsu	activist	7.6M	¥614	-21.5%	¥4.7B ($30.2M)
2025-09-01	BUY	unknown	吉松徹郎 Tetsuro Yoshimatsu	activist	7.6M	¥614	-21.5%	¥4.7B ($30.2M)
2025-09-01	SELL	unknown	吉松徹郎 Tetsuro Yoshimatsu	activist	7.6M	¥614	+21.5%	¥1.2B ($7.4M)
2025-07-17	SELL	unknown	吉松徹郎 Tetsuro Yoshimatsu	activist	9.6M	¥552	+12.7%	¥1.0B ($6.7M)
2025-07-17	SELL	unknown	株式会社ワイ kabushikikaisha wai	activist	12.2M	¥552	+12.7%	¥790M ($5.1M)
2025-07-07	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	7.1M	¥525	-8.2%	¥549M ($3.5M)
2025-06-06	SELL	unknown	ベイリー・ギフォード・アンド・カンパニー(Baillie Gifford & Co) Baillie Gifford & Co	other	3.8M	¥526	+8.4%	¥501M ($3.2M)
2025-05-22	SELL	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	84.3K	¥523	+7.8%	¥29M ($186K)
2025-05-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	6.0M	¥523	+7.8%	¥920M ($5.9M)
2025-05-13	SELL	subscription	アマゾン・ドット・コム・インク(Amazon.com, Inc.) Amazon.com, Inc.	other	53.1M	¥480	-0.4%	¥1.1B ($7.0M)
2025-02-21	SELL	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	125.9K	¥481	-0.2%	¥4M ($25K)
2025-02-21	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	6.9M	¥481	-0.2%	¥468M ($3.0M)
2025-01-22	BUY	unknown	ベイリー・ギフォード・アンド・カンパニー(Baillie Gifford & Co) Baillie Gifford & Co	other	4.2M	¥435	+10.8%	¥1.8B ($11.8M)
2024-07-01	BUY	unknown	株式会社ワイ kabushikikaisha wai	activist	12.2M	¥465	+3.7%	¥5.7B ($36.7M)
2024-07-01	BUY	unknown	株式会社ワイ kabushikikaisha wai	activist	12.2M	¥465	+3.7%	¥5.7B ($36.7M)
2024-07-01	BUY	unknown	吉松徹郎 Tetsuro Yoshimatsu	activist	10.4M	¥465	+3.7%	¥4.8B ($31.2M)
2024-07-01	BUY	unknown	吉松徹郎 Tetsuro Yoshimatsu	activist	10.4M	¥465	+3.7%	¥4.8B ($31.2M)
2024-06-21	SELL	unknown	ベイリー・ギフォード・オーバーシーズ・リミテッド Baillie Gifford Overseas Limited	other	584.0K	¥490	+1.6%	¥76M ($489K)
2024-06-21	BUY	Market Buy	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	132.9K	¥490	-1.6%	¥4M ($26K)
2024-06-21	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	7.9M	¥490	-1.6%	¥419M ($2.7M)
2024-06-21	BUY	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	3.0M	¥490	-1.6%	¥1.5B ($9.5M)
2024-04-02	BUY	unknown	吉松徹郎 Tetsuro Yoshimatsu	activist	10.4M	¥503	-4.2%	¥5.2B ($33.7M)

Showing the 50 most recent of 148 filings.

Frequently asked questions

Who has been buying istyle Inc. stock?: 19 distinct investors have filed 42 disclosed large-shareholding filings in istyle Inc. (3660), most recently on 2026-05-12. 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 istyle Inc. have?: istyle Inc. has 42 buy-side and 57 sell-side disclosures on record, covering ¥52.1B ($336.0M) in total reported value, spanning 2021-04-06 to 2026-05-12.
Where does StockDrifts get istyle 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 istyle Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.