Who has been buying CrowdWorks Inc. stock?

11 distinct investors have filed 20 disclosed large-shareholding filings in CrowdWorks Inc. (3900), most recently on 2026-02-27. 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 CrowdWorks Inc. have?

CrowdWorks Inc. has 20 buy-side and 20 sell-side disclosures on record, covering ¥15.1B ($97.6M) in total reported value, spanning 2021-03-22 to 2026-02-27.

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.

CrowdWorks Inc. 3900

Company

株式会社クラウドワークスCrowdWorks Inc.

Investors

Buys

Total Value

¥15.1B ($97.6M)

Avg Return

-48.83%

Last Filing

2026-02-27

CrowdWorks Inc. (3900) has 20 disclosed large-shareholding filings and 20 disclosed disposals on record, filed by 11 distinct investors. Together those filings cover ¥15.1B ($97.6M) in reported transaction value. The earliest filing StockDrifts holds for CrowdWorks Inc. is dated 2021-03-22; the most recent is 2026-02-27. Across these filings the average return since disclosure is -48.83%, 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
2026-08-17	SELL	Market Buy	牧寛之 Maki Hiroyuki	activist	952.3K	¥677	+2.5%	¥1M ($7K)
2026-05-21	SELL	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	580.6K	¥570	-15.8%	¥121M ($780K)
2026-05-19	BUY	Market Buy	牧寛之 Maki Hiroyuki	activist	952.3K	¥582	-	-
2026-02-27	BUY	Market Buy	牧寛之 Maki Hiroyuki	activist	952.3K	¥672	-	-
2026-02-20	SELL	Market Buy	牧寛之 Maki Hiroyuki	activist	952.3K	¥602	-9.6%	¥953K ($6K)
2026-02-20	BUY	Market Buy	牧寛之 Maki Hiroyuki	activist	952.3K	¥602	-	¥953K ($6K)
2025-11-21	BUY	Market Buy	牧寛之 Maki Hiroyuki	activist	952.3K	¥813	-	-
2025-11-17	BUY	Market Buy	牧寛之 Maki Hiroyuki	passive	952.3K	¥799	-17.4%	¥761M ($4.9M)
2025-10-01	SELL	unknown	吉田浩一郎 Koichiro Yoshida	activist	3.9M	¥884	+25.3%	¥53M ($342K)
2025-10-01	SELL	unknown	吉田真穂 Maho Yoshida	activist	90.0K	¥884	+25.3%	¥3M ($18K)
2025-09-22	SELL	Market Buy	グランジャー・ピーク・グローバル・アドバイザーズ・エルエルシー(Grandeur Peak Global Advisors, LLC) Grandeur Peak Global Advisors, LLC	passive	629.0K	¥963	+31.5%	¥158M ($1.0M)
2025-06-05	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	792.0K	¥1,046	-36.9%	¥828M ($5.3M)
2025-01-08	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	684.7K	¥1,383	+52.3%	¥238M ($1.5M)
2024-06-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	622.6K	¥928	+28.9%	¥273M ($1.8M)
2024-05-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	917.2K	¥1,010	+34.6%	¥392M ($2.5M)
2024-05-09	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	8.0K	¥1,410	-53.2%	¥1.1B ($6.8M)
2024-05-09	BUY	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	853.3K	¥1,410	-53.2%	¥1.2B ($7.7M)
2024-05-09	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	¥1,410	+53.2%	¥33M ($214K)
2024-05-09	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.3M	¥1,410	-53.2%	¥1.8B ($11.7M)
2023-11-27	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	32.8K	¥1,193	+44.7%	¥81M ($526K)
2023-11-27	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.4M	¥1,193	-44.7%	¥1.7B ($10.9M)
2023-08-08	BUY	Market Buy	グランジャー・ピーク・グローバル・アドバイザーズ・エルエルシー(Grandeur Peak Global Advisors, LLC) Grandeur Peak Global Advisors, LLC	passive	777.9K	¥1,271	-48.1%	¥989M ($6.4M)
2023-06-23	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	101.3K	¥1,317	-49.9%	¥88M ($566K)
2023-06-23	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.5M	¥1,317	-49.9%	¥163M ($1.1M)
2023-06-22	SELL	Market Buy	クープランド・カーディフ・アセット・マネジメント・エルエルピー(Coupland Cardiff Asset Management LLP) Coupland Cardiff Asset Management LLP	passive	609.5K	¥1,354	+51.3%	¥234M ($1.5M)
2023-06-09	SELL	Market Buy	クープランド・カーディフ・アセット・マネジメント・エルエルピー(Coupland Cardiff Asset Management LLP) Coupland Cardiff Asset Management LLP	passive	782.4K	¥1,392	+52.6%	¥221M ($1.4M)
2023-06-07	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	33.6K	¥1,507	+56.2%	¥105M ($676K)
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	1.4M	¥1,507	-56.2%	¥247M ($1.6M)
2023-05-24	SELL	Market Buy	クープランド・カーディフ・アセット・マネジメント・エルエルピー(Coupland Cardiff Asset Management LLP) Coupland Cardiff Asset Management LLP	passive	941.6K	¥1,499	+56.0%	¥248M ($1.6M)
2023-03-07	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	102.5K	¥1,834	-	¥188M ($1.2M)
2023-03-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.2M	¥1,834	-64.0%	¥2.2B ($14.3M)
2023-03-07	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	14.0K	¥1,834	+64.0%	¥8M ($54K)
2022-09-07	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	7.5K	¥1,423	-53.6%	¥1.0B ($6.6M)
2022-09-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.3M	¥1,423	-53.6%	¥348M ($2.2M)
2022-09-07	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	18.6K	¥1,423	-	-
2022-02-22	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.1M	¥1,040	-36.5%	¥1.1B ($7.1M)
2022-02-22	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	44.8K	¥1,040	-36.5%	¥5M ($31K)
2022-02-22	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	18.6K	¥1,040	-	-
2022-02-21	BUY	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	966.9K	¥1,058	-37.6%	¥1.0B ($6.5M)
2022-02-21	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	22.6K	¥1,058	+37.6%	¥18M ($115K)
2022-02-07	SELL	Market Buy	クープランド・カーディフ・アセット・マネジメント・エルエルピー(Coupland Cardiff Asset Management LLP) Coupland Cardiff Asset Management LLP	passive	1.1M	¥874	+24.5%	¥143M ($921K)
2022-02-02	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	39.4K	¥954	+30.8%	¥10M ($66K)
2022-02-02	BUY	unknown	ベイリー・ギフォード・アンド・カンパニー Baillie Gifford & Co	other	1.2M	¥954	-30.8%	¥1.2B ($7.5M)
2021-09-07	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	40.1K	¥1,883	+65.0%	¥86M ($556K)
2021-09-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.3M	¥1,883	-65.0%	¥2.4B ($15.2M)
2021-09-07	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	18.6K	¥1,883	+65.0%	¥43M ($278K)
2021-03-22	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	40.9K	¥1,769.391	-62.7%	¥8M ($52K)
2021-03-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	85.8K	¥1,769.391	+62.7%	¥119M ($765K)
2021-03-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.3M	¥1,769.391	-62.7%	¥280M ($1.8M)

Frequently asked questions

Who has been buying CrowdWorks Inc. stock?: 11 distinct investors have filed 20 disclosed large-shareholding filings in CrowdWorks Inc. (3900), most recently on 2026-02-27. 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 CrowdWorks Inc. have?: CrowdWorks Inc. has 20 buy-side and 20 sell-side disclosures on record, covering ¥15.1B ($97.6M) in total reported value, spanning 2021-03-22 to 2026-02-27.
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.