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

4 distinct investors have filed 26 disclosed large-shareholding filings in Rakus Co., Ltd. (3923), most recently on 2025-09-10. 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 Rakus Co., Ltd. have?

Rakus Co., Ltd. has 26 buy-side and 36 sell-side disclosures on record, covering ¥35.2B ($226.9M) in total reported value, spanning 2021-03-29 to 2025-09-10.

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.

Rakus Co., Ltd. 3923

Company

株式会社ラクスRakus Co., Ltd.

Investors

Buys

Total Value

¥35.2B ($226.9M)

Avg Return

-19.15%

Last Filing

2025-09-10

Rakus Co., Ltd. (3923) has 26 disclosed large-shareholding filings and 36 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥35.2B ($226.9M) in reported transaction value. The earliest filing StockDrifts holds for Rakus Co., Ltd. is dated 2021-03-29; the most recent is 2025-09-10. Across these filings the average return since disclosure is -19.15%, 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
2026-06-22	BUY	Market Buy	いちごアセットマネジメント・インターナショナル・ピーティーイー・リミテッド Ichigo Asset Management International, Pte. Ltd.	passive	34.7M	¥916.4	+14.3%	¥5.2B ($33.5M)
2026-06-22	BUY	Market Buy	いちごアセットマネジメント株式会社	engagement	100	¥916.4	-	-
2026-06-05	BUY	Market Buy	いちごアセットマネジメント・インターナショナル・ピーティーイー・リミテッド Ichigo Asset Management International, Pte. Ltd.	passive	29.1M	¥998.9	+4.9%	¥29.0B ($187.2M)
2026-06-05	BUY	Market Buy	いちごアセットマネジメント株式会社	engagement	100	¥998.9	+4.9%	¥100K ($644)
2025-09-10	SELL	Market Buy	松嶋祥文 Yoshifumi Matsushima	passive	7.5M	¥1,356	+22.8%	¥2.4B ($15.8M)
2024-11-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	5.3M	¥1,021.5	-2.5%	¥2.0B ($13.1M)
2024-11-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.3M	¥1,021.5	+2.5%	¥37M ($239K)
2024-11-08	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	7.3M	¥1,034.75	+1.2%	¥7.5B ($48.5M)
2024-11-08	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.3M	¥1,034.75	+1.2%	¥2.4B ($15.3M)
2024-06-14	SELL	unknown	中村崇則 Nakamura Takanori	strategic	61.4M	¥924.75	-13.3%	¥721M ($4.6M)
2024-04-05	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	4.6M	¥946.75	-10.6%	¥1.6B ($10.6M)
2024-04-05	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.5M	¥946.75	-10.6%	¥395M ($2.5M)
2024-01-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	6.3M	¥1,214.75	+13.8%	¥770M ($5.0M)
2024-01-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.0M	¥1,214.75	-13.8%	¥132M ($852K)
2024-01-11	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	7.0M	¥1,215.5	-13.8%	¥903M ($5.8M)
2024-01-11	SELL	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.8M	¥1,215.5	+13.8%	¥132M ($853K)
2023-12-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	6.2M	¥1,283.75	+18.4%	¥1.3B ($8.7M)
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	2.9M	¥1,283.75	-18.4%	¥47M ($300K)
2023-11-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	7.3M	¥1,287.5	+18.6%	¥280M ($1.8M)
2023-11-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.9M	¥1,287.5	-	-
2023-11-08	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	7.5M	¥1,077	+2.7%	¥1.9B ($12.1M)
2023-11-08	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.9M	¥1,077	+2.7%	¥59M ($378K)
2023-10-20	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	9.2M	¥900.25	-16.4%	¥163M ($1.1M)
2023-10-20	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.0M	¥900.25	+16.4%	¥16M ($105K)
2023-10-06	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	9.4M	¥1,006	+4.1%	¥1.5B ($9.6M)
2023-10-06	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.9M	¥1,006	-	-
2023-07-24	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	7.9M	¥1,211.25	+13.5%	¥110M ($708K)
2023-07-24	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.0M	¥1,211.25	-13.5%	¥44M ($283K)
2023-07-07	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	8.0M	¥1,141.5	-8.2%	¥83M ($534K)
2023-07-07	SELL	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	2.9M	¥1,141.5	+8.2%	¥248M ($1.6M)
2023-06-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	7.9M	¥1,308.75	+20.0%	¥261M ($1.7M)
2023-06-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.1M	¥1,308.75	-	-
2023-04-21	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	8.1M	¥1,009	-3.8%	¥439M ($2.8M)
2023-04-21	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.1M	¥1,009	-	-
2023-04-07	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	8.6M	¥927.5	+12.9%	¥67M ($434K)
2023-04-07	SELL	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	¥927.5	-12.9%	¥50M ($325K)
2023-02-24	SELL	unknown	中村崇則 Nakamura Takanori	strategic	62.2M	¥854	-22.7%	¥46M ($300K)
2023-02-22	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	8.5M	¥828.5	+26.4%	¥2.1B ($13.7M)
2023-02-22	SELL	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.2M	¥828.5	-26.4%	¥15M ($97K)
2023-01-20	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	5.9M	¥879	-19.2%	¥32M ($206K)
2023-01-20	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.2M	¥879	-19.2%	¥191M ($1.2M)
2022-12-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	6.0M	¥773	-35.5%	¥14M ($90K)
2022-12-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.4M	¥773	-35.5%	¥98M ($633K)
2022-11-08	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	6.0M	¥866.5	-	-
2022-11-08	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.5M	¥866.5	-20.9%	¥31M ($203K)
2022-10-21	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	6.0M	¥743	-41.0%	¥27M ($174K)
2022-10-21	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.6M	¥743	-	-
2022-10-07	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	6.0M	¥743.5	+40.9%	¥4.5B ($29.0M)
2022-10-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	3.6M	¥743.5	+40.9%	¥2.7B ($17.2M)
2022-09-26	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	5.3M	¥710.5	+47.4%	¥26M ($166K)

Showing the 50 most recent of 78 filings.

Frequently asked questions

Who has been buying Rakus Co., Ltd. stock?: 4 distinct investors have filed 26 disclosed large-shareholding filings in Rakus Co., Ltd. (3923), most recently on 2025-09-10. 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 Rakus Co., Ltd. have?: Rakus Co., Ltd. has 26 buy-side and 36 sell-side disclosures on record, covering ¥35.2B ($226.9M) in total reported value, spanning 2021-03-29 to 2025-09-10.
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.

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.