Who has been buying Kamakura Shinsho, Ltd. stock?

14 distinct investors have filed 34 disclosed large-shareholding filings in Kamakura Shinsho, Ltd. (6184), 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 Kamakura Shinsho, Ltd. have?

Kamakura Shinsho, Ltd. has 34 buy-side and 39 sell-side disclosures on record, covering ¥11.8B ($76.1M) in total reported value, spanning 2021-04-06 to 2026-05-12.

Where does StockDrifts get Kamakura Shinsho, 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.

Kamakura Shinsho, Ltd. 6184

Company

株式会社鎌倉新書Kamakura Shinsho, Ltd.

Investors

Buys

Total Value

¥11.8B ($76.1M)

Avg Return

-34.00%

Last Filing

2026-05-12

Kamakura Shinsho, Ltd. (6184) has 34 disclosed large-shareholding filings and 39 disclosed disposals on record, filed by 14 distinct investors. Together those filings cover ¥11.8B ($76.1M) in reported transaction value. The earliest filing StockDrifts holds for Kamakura Shinsho, Ltd. 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 -34.00%, 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
2026-08-14	BUY	unknown	株式会社かまくらホールディングス	activist	13.8M	¥567	+0.0%	¥7.8B ($50.4M)
2026-08-14	BUY	unknown	清水祐孝	activist	800.0K	¥567	+0.0%	¥454M ($2.9M)
2026-08-04	BUY	Market Buy	株式会社かまくらホールディングス	activist	13.8M	¥525	+8.0%	¥5.5B ($35.2M)
2026-08-04	SELL	unknown	清水祐孝	activist	800.0K	¥525	-8.0%	¥5.9B ($38.0M)
2026-08-04	BUY	Market Buy	株式会社かまくらホールディングス	activist	13.8M	¥525	+8.0%	¥5.5B ($35.2M)
2026-08-04	SELL	unknown	清水祐孝	activist	800.0K	¥525	-8.0%	¥5.9B ($38.0M)
2026-05-12	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.0M	¥468	+1.7%	¥212M ($1.4M)
2026-04-22	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	6.6K	¥471	+2.3%	¥37M ($238K)
2026-04-22	SELL	unknown	アセットマネジメントOne株式会社	other	3.4M	¥471	+2.3%	¥136M ($876K)
2026-04-22	SELL	unknown	みずほ証券株式会社	other	21.1K	¥471	+2.3%	¥14M ($88K)
2026-03-06	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	1.8M	¥528	+9.5%	¥235M ($1.5M)
2026-01-16	BUY	unknown	SOMPOホールディングス株式会社 Sompo Holdings, Inc.	strategic	4.1M	¥629	-24.0%	¥2.6B ($16.7M)
2026-01-16	BUY	unknown	SOMPOホールディングス株式会社 Sompo Holdings, Inc.	strategic	4.1M	¥629	-24.0%	¥2.6B ($16.7M)
2025-06-20	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	0	¥533	+10.3%	¥177M ($1.1M)
2025-06-20	SELL	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	2.1M	¥533	+10.3%	¥94M ($604K)
2025-03-26	BUY	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	83.0K	¥475	+0.6%	¥39M ($254K)
2025-03-26	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.5M	¥475	+0.6%	¥1.6B ($10.6M)
2025-03-26	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	46.0K	¥475	-0.6%	¥7.8B ($50.3M)
2025-03-21	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	332.7K	¥466	-2.6%	¥271M ($1.7M)
2025-03-21	BUY	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	2.3M	¥466	+2.6%	¥51M ($329K)
2024-07-19	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	912.8K	¥442	-8.1%	¥105M ($679K)
2024-07-19	SELL	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	2.2M	¥442	-8.1%	¥72M ($468K)
2024-07-03	SELL	unknown	株式会社かまくらホールディングス Kamakura Holdings Co., Ltd.	activist	3.2M	¥422	-13.3%	¥2M ($11K)
2024-07-03	SELL	unknown	清水祐孝 Hirotaka SHIMIZU	activist	11.4M	¥422	-13.3%	¥10M ($64K)
2024-04-22	SELL	unknown	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	1.8M	¥516	+7.4%	¥340M ($2.2M)
2024-02-16	BUY	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	81.8K	¥576	-17.0%	¥7M ($44K)
2024-02-16	BUY	unknown	米国みずほ証券 Mizuho Securities USA LLC	other	0	¥576	-17.0%	-
2024-02-16	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.8M	¥576	-17.0%	¥225M ($1.5M)
2024-02-16	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	208.9K	¥576	+17.0%	¥11M ($73K)
2024-01-22	SELL	unknown	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	2.5M	¥620	+22.9%	¥281M ($1.8M)
2023-12-22	BUY	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	70.9K	¥536	-10.8%	¥38M ($245K)
2023-12-22	BUY	unknown	米国みずほ証券 Mizuho Securities USA LLC	other	0	¥536	-10.8%	-
2023-12-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.4M	¥536	-10.8%	¥50M ($324K)
2023-12-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	232.0K	¥536	+10.8%	¥73M ($473K)
2023-12-22	SELL	unknown	フィデリティ投信株式会社 FIL Investments (Japan) Limited	other	2.9M	¥536	+10.8%	¥456M ($2.9M)
2023-11-08	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	70.9K	¥617	-22.5%	¥44M ($282K)
2023-11-08	BUY	Market Buy	米国みずほ証券 Mizuho Securities USA LLC	other	0	¥617	-22.5%	-
2023-11-08	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.3M	¥617	-22.5%	¥132M ($855K)
2023-11-08	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	365.6K	¥617	-22.5%	¥108M ($699K)
2023-09-25	SELL	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	70.9K	¥625	+23.5%	¥2M ($16K)
2023-09-25	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.1M	¥625	-23.5%	¥195M ($1.3M)
2023-09-25	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	190.9K	¥625	-23.5%	¥71M ($456K)
2023-06-07	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	72.4K	¥804	+40.5%	¥3M ($20K)
2023-06-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.8M	¥804	-40.5%	¥2.2B ($14.4M)
2023-06-07	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	77.2K	¥804	+40.5%	¥19M ($121K)
2022-12-21	BUY	Market Buy	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	1.2M	¥937	-49.0%	¥219M ($1.4M)
2022-12-21	BUY	Market Buy	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	2.4M	¥937	-49.0%	¥164M ($1.1M)
2022-10-06	BUY	Market Buy	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	916.7K	¥878	-45.6%	¥120M ($773K)
2022-10-06	BUY	Market Buy	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	2.2M	¥878	-45.6%	¥352M ($2.3M)
2022-10-03	SELL	unknown	株式会社かまくらホールディングス Kamakura Holdings Co., Ltd.	activist	3.2M	¥839	+43.0%	¥7M ($42K)

Showing the 50 most recent of 91 filings.

Frequently asked questions

Who has been buying Kamakura Shinsho, Ltd. stock?: 14 distinct investors have filed 34 disclosed large-shareholding filings in Kamakura Shinsho, Ltd. (6184), 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 Kamakura Shinsho, Ltd. have?: Kamakura Shinsho, Ltd. has 34 buy-side and 39 sell-side disclosures on record, covering ¥11.8B ($76.1M) in total reported value, spanning 2021-04-06 to 2026-05-12.
Where does StockDrifts get Kamakura Shinsho, 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 Kamakura Shinsho, Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.