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

10 distinct investors have filed 35 disclosed large-shareholding filings in Serverworks Co.,Ltd. (4434), most recently on 2026-01-26. 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 Serverworks Co.,Ltd. have?

Serverworks Co.,Ltd. has 35 buy-side and 30 sell-side disclosures on record, covering ¥19.0B ($122.7M) in total reported value, spanning 2021-04-26 to 2026-01-26.

Where does StockDrifts get Serverworks Co.,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.

Serverworks Co.,Ltd. 4434

Company

株式会社サーバーワークスServerworks Co.,Ltd.

Investors

Buys

Total Value

¥19.0B ($122.7M)

Avg Return

-23.31%

Last Filing

2026-01-26

Serverworks Co.,Ltd. (4434) has 35 disclosed large-shareholding filings and 30 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥19.0B ($122.7M) in reported transaction value. The earliest filing StockDrifts holds for Serverworks Co.,Ltd. is dated 2021-04-26; the most recent is 2026-01-26. 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 -23.31%, 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
2026-01-26	BUY	unknown	株式会社BSアセットマネジメント	activist	1.3M	¥2,009	+1.4%	¥2.6B ($16.7M)
2026-01-26	SELL	unknown	大石良	activist	1.6M	¥2,009	-1.4%	¥3.2B ($20.8M)
2026-01-19	SELL	unknown	NTTドコモビジネス株式会社	other	260.0K	¥1,968	-3.5%	¥530M ($3.4M)
2026-01-19	SELL	unknown	株式会社NTTデータ	strategic	0	¥1,968	-3.5%	-
2026-01-07	SELL	unknown	株式会社NTTデータ	strategic	260.0K	¥1,926	-5.8%	¥530M ($3.4M)
2026-01-07	SELL	unknown	株式会社NTTデータ	strategic	260.0K	¥1,926	-5.8%	¥530M ($3.4M)
2026-01-07	SELL	unknown	NTTドコモビジネス株式会社	other	260.0K	¥1,926	-5.8%	¥530M ($3.4M)
2026-01-07	SELL	unknown	NTTドコモビジネス株式会社	other	260.0K	¥1,926	-5.8%	¥530M ($3.4M)
2026-01-07	SELL	unknown	株式会社NTTデータ	strategic	260.0K	¥1,926	-5.8%	¥530M ($3.4M)
2026-01-07	SELL	unknown	NTTドコモビジネス株式会社	other	260.0K	¥1,926	-5.8%	¥530M ($3.4M)
2025-12-26	BUY	unknown	株式会社NTTデータ	unknown	260.0K	¥1,815	-12.2%	¥530M ($3.4M)
2025-12-26	SELL	unknown	株式会社NTTデータグループ	strategic	0	¥1,815	-12.2%	-
2025-12-26	SELL	unknown	エヌ・ティ・ティ・コミュニケーションズ株式会社	other	260.0K	¥1,815	-12.2%	¥530M ($3.4M)
2025-12-26	BUY	unknown	株式会社NTTデータ	strategic	260.0K	¥1,815	+12.2%	¥530M ($3.4M)
2025-12-26	BUY	unknown	エヌ・ティ・ティ・コミュニケーションズ株式会社	other	260.0K	¥1,815	+12.2%	¥530M ($3.4M)
2025-12-26	SELL	unknown	株式会社NTTデータ	strategic	260.0K	¥1,815	-12.2%	¥530M ($3.4M)
2025-12-26	SELL	unknown	NTTドコモビジネス株式会社	other	260.0K	¥1,815	-12.2%	¥530M ($3.4M)
2025-12-26	BUY	unknown	株式会社NTTデータ	strategic	260.0K	¥1,815	+12.2%	¥530M ($3.4M)
2025-12-26	BUY	unknown	エヌ・ティ・ティ・コミュニケーションズ株式会社	other	260.0K	¥1,815	+12.2%	¥530M ($3.4M)
2025-12-26	SELL	unknown	株式会社NTTデータグループ	strategic	0	¥1,815	-12.2%	-
2025-12-26	SELL	unknown	エヌ・ティ・ティ・コミュニケーションズ株式会社	other	260.0K	¥1,815	-12.2%	¥530M ($3.4M)
2025-12-26	SELL	unknown	株式会社エヌ・ティ・ティ・データ	strategic	260.0K	¥1,815	-12.2%	¥530M ($3.4M)
2025-12-26	SELL	unknown	エヌ・ティ・ティ・コミュニケーションズ株式会社	other	260.0K	¥1,815	-12.2%	¥530M ($3.4M)
2025-12-26	BUY	unknown	株式会社エヌ・ティ・ティ・データ	strategic	65.0K	¥1,815	+12.2%	¥132M ($854K)
2025-12-26	BUY	unknown	エヌ・ティ・ティ・コミュニケーションズ株式会社	other	65.0K	¥1,815	+12.2%	¥132M ($854K)
2025-10-24	BUY	unknown	株式会社BSアセットマネジメント BS Asset Management Co., Ltd.	activist	770.0K	¥1,839	+10.8%	¥400M ($2.6M)
2025-10-24	BUY	unknown	株式会社BSアセットマネジメント BS Asset Management Co., Ltd.	activist	770.0K	¥1,839	+10.8%	¥400M ($2.6M)
2025-10-24	SELL	unknown	大石良 Ryo Oishi	activist	2.1M	¥1,839	-10.8%	¥419M ($2.7M)
2025-10-24	SELL	unknown	大石良 Ryo Oishi	activist	2.1M	¥1,839	-10.8%	¥419M ($2.7M)
2025-06-05	BUY	unknown	株式会社BSアセットマネジメント BS Asset Management Co., Ltd.	activist	550.0K	¥2,375	-14.2%	¥590M ($3.8M)
2025-06-05	SELL	unknown	大石良 Ryo Oishi	activist	2.3M	¥2,375	+14.2%	¥683M ($4.4M)
2024-05-09	BUY	unknown	株式会社BSアセットマネジメント BS Asset Management Co., Ltd.	activist	300.0K	¥3,015	-32.4%	¥303M ($2.0M)
2024-05-09	SELL	unknown	大石良 Ryo Oishi	activist	2.6M	¥3,015	+32.4%	¥305M ($2.0M)
2024-03-07	SELL	unknown	株式会社BSアセットマネジメント BS Asset Management Co., Ltd.	activist	200.0K	¥4,375	+53.4%	¥14M ($88K)
2024-03-07	SELL	unknown	大石良 Ryo Oishi	activist	2.7M	¥4,375	+53.4%	¥144M ($929K)
2024-02-06	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	54.0K	¥4,150	+50.9%	¥247M ($1.6M)
2024-02-06	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	197.6K	¥4,150	-50.9%	¥810M ($5.2M)
2024-02-06	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	5.7K	¥4,150	+50.9%	¥3M ($21K)
2023-12-21	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	6.1K	¥3,230	-36.9%	¥20M ($128K)
2023-12-21	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	113.3K	¥3,230	-36.9%	¥366M ($2.4M)
2023-12-21	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	275.8K	¥3,230	-36.9%	¥891M ($5.7M)
2023-11-07	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	5.7K	¥3,355	-39.3%	¥19M ($123K)
2023-11-07	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	63.1K	¥3,355	-39.3%	¥39M ($254K)
2023-11-07	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	270.5K	¥3,355	-39.3%	¥895M ($5.8M)
2023-10-05	BUY	Market Buy	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	7.2K	¥3,775	-46.0%	¥27M ($171K)
2023-10-05	SELL	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	51.5K	¥3,775	+46.0%	¥1.3B ($8.5M)
2023-10-05	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	353.2K	¥3,775	-46.0%	¥1.3B ($8.6M)
2023-09-22	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	0	¥3,855	-47.2%	-
2023-09-22	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	401.4K	¥3,855	-47.2%	¥1.5B ($10.0M)
2023-09-22	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	-1.6K	¥3,855	-47.2%	-

Showing the 50 most recent of 68 filings.

Frequently asked questions

Who has been buying Serverworks Co.,Ltd. stock?: 10 distinct investors have filed 35 disclosed large-shareholding filings in Serverworks Co.,Ltd. (4434), most recently on 2026-01-26. 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 Serverworks Co.,Ltd. have?: Serverworks Co.,Ltd. has 35 buy-side and 30 sell-side disclosures on record, covering ¥19.0B ($122.7M) in total reported value, spanning 2021-04-26 to 2026-01-26.
Where does StockDrifts get Serverworks Co.,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 Serverworks Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.