Who has been buying Japan Data Science Consortium Co.Ltd. stock?

8 distinct investors have filed 11 disclosed large-shareholding filings in Japan Data Science Consortium Co.Ltd. (4418), most recently on 2025-11-12. 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 Japan Data Science Consortium Co.Ltd. have?

Japan Data Science Consortium Co.Ltd. has 11 buy-side and 14 sell-side disclosures on record, covering ¥29.1B ($187.6M) in total reported value, spanning 2021-12-22 to 2025-11-12.

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.

Japan Data Science Consortium Co.Ltd. 4418

Company

株式会社JDSCJapan Data Science Consortium Co.Ltd.

Investors

Buys

Total Value

¥29.1B ($187.6M)

Avg Return

-39.24%

Last Filing

2025-11-12

Japan Data Science Consortium Co.Ltd. (4418) has 11 disclosed large-shareholding filings and 14 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥29.1B ($187.6M) in reported transaction value. The earliest filing StockDrifts holds for Japan Data Science Consortium Co.Ltd. is dated 2021-12-22; the most recent is 2025-11-12. Across these filings the average return since disclosure is -39.24%, 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
2025-11-12	BUY	negotiated	ソフトバンク株式会社 SoftBank Corp.	strategic	1.6M	¥1,448	-22.0%	¥2.3B ($14.9M)
2025-11-06	BUY	unknown	淵高晴 Takaharu Fuchi	activist	848.6K	¥1,403	-	¥378M ($2.4M)
2025-11-06	SELL	unknown	淵高晴 Takaharu Fuchi	activist	456.3K	¥1,403	+19.5%	¥928M ($6.0M)
2025-10-31	BUY	unknown	淵高晴 Takaharu Fuchi	activist	428.2K	¥1,481	-23.8%	¥1.0B ($6.6M)
2025-08-12	BUY	unknown	加藤聡志 Satoshi Kato	activist	3.9M	¥1,038	-	-
2025-03-06	SELL	unknown	大和証券株式会社 Daiwa Securities Co.Ltd.	other	1.5K	¥843	-33.9%	¥528M ($3.4M)
2025-03-06	BUY	unknown	大和アセットマネジメント株式会社 Daiwa Asset Management Co.Ltd.	other	21.5K	¥843	+33.9%	¥1M ($8K)
2025-02-21	BUY	unknown	加藤聡志 Satoshi Kato	activist	3.9M	¥1,002	-	-
2025-02-21	BUY	unknown	加藤聡志 Satoshi Kato	activist	3.9M	¥1,002	-	¥651M ($4.2M)
2025-01-21	SELL	unknown	大和証券株式会社 Daiwa Securities Co.Ltd.	other	763.5K	¥838	-34.7%	¥163M ($1.1M)
2025-01-21	BUY	unknown	大和アセットマネジメント株式会社 Daiwa Asset Management Co.Ltd.	other	20.5K	¥838	+34.7%	¥3M ($22K)
2024-12-19	SELL	unknown	大和証券株式会社 Daiwa Securities Co.Ltd.	other	958.6K	¥1,087	-3.9%	¥165M ($1.1M)
2024-12-19	BUY	unknown	大和アセットマネジメント株式会社 Daiwa Asset Management Co.Ltd.	other	17.0K	¥1,087	+3.9%	¥18M ($116K)
2024-12-05	SELL	unknown	大和証券株式会社 Daiwa Securities Co.Ltd.	other	1.1M	¥1,002	-12.7%	¥147M ($946K)
2024-11-21	BUY	unknown	大和証券株式会社 Daiwa Securities Co.Ltd.	other	1.3M	¥917	+23.1%	¥1.1B ($7.4M)
2024-11-18	SELL	unknown	加藤聡志 Satoshi Kato	activist	4.6M	¥893	-26.4%	¥329M ($2.1M)
2024-11-18	BUY	unknown	加藤聡志 Satoshi Kato	activist	4.6M	¥893	-	-
2024-02-28	SELL	unknown	加藤聡志 Satoshi Kato	activist	4.6M	¥915	-23.4%	¥337M ($2.2M)
2023-07-11	SELL	unknown	淵高晴 Takaharu Fuchi	activist	1.0M	¥954	-18.3%	¥130M ($840K)
2023-06-19	BUY	unknown	淵高晴 Takaharu Fuchi	activist	1.2M	¥1,182	-	¥178M ($1.2M)
2023-06-19	SELL	unknown	淵高晴 Takaharu Fuchi	activist	1.0M	¥1,182	+4.5%	¥340M ($2.2M)
2022-12-27	BUY	subscription	金井正義 Masayoshi Kanai	activist	252.7K	¥799	-	¥565M ($3.6M)
2022-12-27	SELL	subscription	金井正義 Masayoshi Kanai	activist	252.7K	¥799	-41.3%	¥565M ($3.6M)
2022-09-21	SELL	Market Buy	株式会社東京大学エッジキャピタルパートナーズ The University of Tokyo Edge Capital Partners Co., Ltd.	passive	592.9K	¥612	-84.5%	¥80M ($516K)
2022-08-22	SELL	Market Buy	株式会社東京大学エッジキャピタルパートナーズ The University of Tokyo Edge Capital Partners Co., Ltd.	passive	724.3K	¥747	-51.1%	¥99M ($636K)
2022-07-13	SELL	Market Buy	株式会社東京大学エッジキャピタルパートナーズ The University of Tokyo Edge Capital Partners Co., Ltd.	passive	855.4K	¥618	-82.7%	¥117M ($756K)
2022-03-25	BUY	unknown	淵高晴 Takaharu Fuchi	activist	1.3M	¥905	-	-
2022-03-25	BUY	unknown	淵高晴 Takaharu Fuchi	activist	1.3M	¥905	-	-
2022-03-17	BUY	unknown	淵高晴 Takaharu Fuchi	activist	1.3M	¥840	-	-
2022-03-17	BUY	unknown	淵高晴 Takaharu Fuchi	activist	1.3M	¥840	-	¥1.1B ($6.9M)
2022-01-24	SELL	unknown	加藤聡志 Satoshi Kato	activist	4.6M	¥1,364	+17.2%	¥482M ($3.1M)
2021-12-27	BUY	subscription	金井正義 Masayoshi Kanai	activist	1.0M	¥2,682	-	¥2.7B ($17.5M)
2021-12-27	BUY	Market Buy	株式会社東京大学エッジキャピタルパートナーズ The University of Tokyo Edge Capital Partners Co., Ltd.	passive	1.0M	¥2,682	-57.9%	¥2.8B ($18.1M)
2021-12-27	BUY	subscription	金井正義 Masayoshi Kanai	activist	1.0M	¥2,682	-57.9%	¥2.7B ($17.5M)
2021-12-23	BUY	unknown	加藤聡志 Satoshi Kato	activist	4.9M	¥2,848	-60.4%	¥14.1B ($90.8M)
2021-12-23	BUY	Market Buy	スパークス・アセット・マネジメント株式会社 SPARX Asset Management Co., Ltd.	passive	1.7M	¥2,848	-60.4%	¥5.0B ($32.1M)
2021-12-22	BUY	unknown	淵高晴 Takaharu Fuchi	activist	1.3M	¥2,348	-51.9%	¥3.0B ($19.3M)

Frequently asked questions

Who has been buying Japan Data Science Consortium Co.Ltd. stock?: 8 distinct investors have filed 11 disclosed large-shareholding filings in Japan Data Science Consortium Co.Ltd. (4418), most recently on 2025-11-12. 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 Japan Data Science Consortium Co.Ltd. have?: Japan Data Science Consortium Co.Ltd. has 11 buy-side and 14 sell-side disclosures on record, covering ¥29.1B ($187.6M) in total reported value, spanning 2021-12-22 to 2025-11-12.
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.