Who has been buying Data Horizon Corporation stock?

9 distinct investors have filed 13 disclosed large-shareholding filings in Data Horizon Corporation (3628), most recently on 2026-03-06. 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 Data Horizon Corporation have?

Data Horizon Corporation has 13 buy-side and 12 sell-side disclosures on record, covering ¥3.0B ($19.2M) in total reported value, spanning 2021-03-19 to 2026-03-06.

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.

Data Horizon Corporation 3628

Company

株式会社データホライゾンData Horizon Corporation

Investors

Buys

Total Value

¥3.0B ($19.2M)

Avg Return

-54.88%

Last Filing

2026-03-06

Data Horizon Corporation (3628) has 13 disclosed large-shareholding filings and 12 disclosed disposals on record, filed by 9 distinct investors. Together those filings cover ¥3.0B ($19.2M) in reported transaction value. The earliest filing StockDrifts holds for Data Horizon Corporation is dated 2021-03-19; the most recent is 2026-03-06. Across these filings the average return since disclosure is -54.88%, 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
2026-03-06	BUY	unknown	株式会社渡辺住研 Watanabe Juken Co., Ltd.	other	438.2K	¥484	+51.2%	¥212M ($1.4M)
2026-03-06	BUY	unknown	株式会社渡辺住研	other	438.2K	¥484	+51.2%	¥212M ($1.4M)
2026-03-06	BUY	unknown	渡邉毅人	unknown	213.0K	¥484	+51.2%	¥103M ($665K)
2022-08-08	BUY	private	株式会社ディー・エヌ・エー DeNA Co., Ltd.	activist	6.5M	¥1,848	-60.4%	¥2.2B ($13.9M)
2022-08-05	BUY	Market Buy	モルガン・スタンレーMUFG証券株式会社 Morgan Stanley MUFG Securities Co., Ltd.	other	21.4K	¥1,861	-60.7%	¥24M ($154K)
2022-08-05	BUY	Market Buy	モルガン・スタンレー・アンド・カンパニー・インターナショナル・ピーエルシー Morgan Stanley & Co. International plc	other	120.3K	¥1,861	-60.7%	¥213M ($1.4M)
2022-08-04	BUY	negotiated	内海良夫 YOSHIO UTSUMI	activist	1.1M	¥1,791	-	¥1.7B ($11.3M)
2022-08-04	SELL	negotiated	内海良夫 YOSHIO UTSUMI	activist	1.1M	¥1,791	+59.1%	¥1.7B ($11.3M)
2022-08-04	SELL	negotiated	株式会社ベネフィット・ワン Benefit One Inc.	strategic	436.9K	¥1,791	+59.1%	¥559M ($3.6M)
2022-08-02	BUY	private	株式会社ディー・エヌ・エー DeNA Co., Ltd.	activist	4.5M	¥1,618	-54.8%	¥5.1B ($32.9M)
2022-07-25	SELL	unknown	Bridge Capital Asset Management株式会社 Bridge Capital Asset Management Co., Ltd.	other	449.8K	¥2,000	+63.4%	¥278M ($1.8M)
2022-07-22	BUY	unknown	モルガン・スタンレーMUFG証券株式会社 Morgan Stanley MUFG Securities Co., Ltd.	other	8.3K	¥2,045	-64.2%	¥17M ($110K)
2022-07-22	BUY	unknown	モルガン・スタンレー・アンド・カンパニー・インターナショナル・ピーエルシー Morgan Stanley & Co. International plc	other	548.4K	¥2,045	-64.2%	¥1.1B ($7.2M)
2022-07-08	SELL	negotiated	株式会社ベネフィット・ワン Benefit One Inc.	strategic	750.0K	¥2,007	+63.5%	¥2M ($14K)
2022-07-08	BUY	negotiated	株式会社ベネフィット・ワン Benefit One Inc.	strategic	750.0K	¥2,007	-	¥2M ($14K)
2022-07-07	SELL	unknown	Bridge Capital Asset Management株式会社 Bridge Capital Asset Management Co., Ltd.	other	589.8K	¥2,007	+63.5%	¥283M ($1.8M)
2022-07-06	BUY	negotiated	内海良夫 YOSHIO UTSUMI	activist	2.1M	¥2,030	-	-
2022-07-06	BUY	negotiated	内海良夫 YOSHIO UTSUMI	activist	2.1M	¥2,030	-	-
2022-07-06	BUY	negotiated	内海良夫 YOSHIO UTSUMI	activist	707.3K	¥2,030	-	-
2022-07-06	BUY	private	株式会社ディー・エヌ・エー DeNA Co., Ltd.	activist	1.4M	¥2,030	-	-
2022-07-06	BUY	unknown	株式会社ディー・エヌ・エー DeNA Co., Ltd.	strategic	456.7K	¥2,030	-	-
2022-06-22	SELL	unknown	Bridge Capital Asset Management株式会社 Bridge Capital Asset Management Co., Ltd.	other	730.2K	¥1,492	+50.9%	¥166M ($1.1M)
2021-07-06	BUY	unknown	モルガン・スタンレーMUFG証券株式会社 Morgan Stanley MUFG Securities Co., Ltd.	other	100	¥1,473.333	-	¥147K ($951)
2021-07-06	SELL	unknown	モルガン・スタンレー・アンド・カンパニー・エルエルシー Morgan Stanley & Co. LLC	other	7.6K	¥1,473.333	+50.3%	¥5M ($30K)
2021-07-06	SELL	unknown	モルガン・スタンレー・アンド・カンパニー・インターナショナル・ピーエルシー Morgan Stanley & Co. International plc	other	0	¥1,473.333	+50.3%	¥4M ($23K)
2021-06-07	BUY	negotiated	内海良夫 YOSHIO UTSUMI	activist	707.3K	¥1,331.667	-	-
2021-06-07	BUY	negotiated	内海良夫 YOSHIO UTSUMI	activist	707.3K	¥1,331.667	-	-
2021-06-04	BUY	Market Buy	株式会社ディー・エヌ・エー DeNA Co., Ltd.	strategic	456.7K	¥1,356.667	-46.0%	¥204M ($1.3M)
2021-04-21	BUY	unknown	モルガン・スタンレー・アンド・カンパニー・インターナショナル・ピーエルシー Morgan Stanley & Co. International plc	other	241.1K	¥1,716.667	-57.4%	¥414M ($2.7M)
2021-04-21	BUY	unknown	モルガン・スタンレー・アンド・カンパニー・エルエルシー Morgan Stanley & Co. LLC	other	10.6K	¥1,716.667	-57.4%	¥18M ($117K)
2021-04-06	SELL	unknown	モルガン・スタンレー・アンド・カンパニー・インターナショナル・ピーエルシー Morgan Stanley & Co. International plc	other	0	¥1,593.333	+54.1%	¥4M ($24K)
2021-04-06	SELL	unknown	モルガン・スタンレー・アンド・カンパニー・エルエルシー Morgan Stanley & Co. LLC	other	13.8K	¥1,593.333	+54.1%	¥3M ($18K)
2021-03-19	SELL	unknown	モルガン・スタンレー・アンド・カンパニー・エルエルシー Morgan Stanley & Co. LLC	other	15.8K	¥1,368.333	+46.5%	¥488K ($3K)
2021-03-19	BUY	unknown	モルガン・スタンレーMUFG証券株式会社 Morgan Stanley MUFG Securities Co., Ltd.	other	400	¥1,368.333	-46.5%	¥57M ($368K)
2021-03-19	SELL	unknown	モルガン・スタンレー・アンド・カンパニー・インターナショナル・ピーエルシー Morgan Stanley & Co. International plc	other	233.7K	¥1,368.333	+46.5%	¥19M ($120K)

Frequently asked questions

Who has been buying Data Horizon Corporation stock?: 9 distinct investors have filed 13 disclosed large-shareholding filings in Data Horizon Corporation (3628), most recently on 2026-03-06. 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 Data Horizon Corporation have?: Data Horizon Corporation has 13 buy-side and 12 sell-side disclosures on record, covering ¥3.0B ($19.2M) in total reported value, spanning 2021-03-19 to 2026-03-06.
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.