Who has been buying Cybozu, Inc. stock?

3 distinct investors have filed 5 disclosed large-shareholding filings in Cybozu, Inc. (4776), most recently on 2026-01-19. 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 Cybozu, Inc. have?

Cybozu, Inc. has 5 buy-side and 2 sell-side disclosures on record, covering ¥25.3B ($163.3M) in total reported value, spanning 2021-07-30 to 2026-01-19.

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.

Cybozu, Inc. 4776

Company

サイボウズ株式会社Cybozu, Inc.

Investors

Buys

Total Value

¥25.3B ($163.3M)

Avg Return

+70.80%

Last Filing

2026-01-19

Cybozu, Inc. (4776) has 5 disclosed large-shareholding filings and 2 disclosed disposals on record, filed by 3 distinct investors. Together those filings cover ¥25.3B ($163.3M) in reported transaction value. The earliest filing StockDrifts holds for Cybozu, Inc. is dated 2021-07-30; the most recent is 2026-01-19. Across these filings the average return since disclosure is +70.80%, 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
2026-07-29	BUY	unknown	Cbzサポーターズ株式会社	strategic	8.1M	¥2,831	-	-
2026-07-29	BUY	unknown	西端慶久	other	882.7K	¥2,831	-	-
2026-07-03	BUY	Market Buy	西端慶久	other	882.7K	¥2,533	+19.0%	¥27M ($172K)
2026-07-03	BUY	unknown	Cbzサポーターズ株式会社	strategic	8.1M	¥2,533	-	-
2026-01-19	BUY	Market Buy	西端慶久	other	869.7K	¥2,588	+16.5%	¥68M ($440K)
2026-01-19	BUY	Market Buy	Cbzサポーターズ株式会社	strategic	8.1M	¥2,588	+16.5%	¥55M ($352K)
2022-12-19	SELL	unknown	畑慎也 Shinya Hata	other	8.5M	¥2,586	-16.6%	¥573M ($3.7M)
2022-06-28	BUY	unknown	西端慶久 Yoshihisa Nishibata	other	845.2K	¥954	+216.0%	¥10M ($65K)
2022-06-28	SELL	unknown	西端慶久 Yoshihisa Nishibata	other	845.2K	¥954	-216.0%	¥116M ($747K)
2022-06-28	BUY	unknown	Cbzサポーターズ株式会社 Cbz Supporters Co., Ltd.	strategic	8.1M	¥954	+216.0%	¥7.6B ($49.2M)
2022-06-28	BUY	unknown	Cbzサポーターズ株式会社 Cbz Supporters Co., Ltd.	strategic	8.1M	¥954	+216.0%	¥10M ($65K)
2021-07-30	BUY	unknown	畑慎也 Shinya Hata	other	8.7M	¥2,392	-	-

Frequently asked questions

Who has been buying Cybozu, Inc. stock?: 3 distinct investors have filed 5 disclosed large-shareholding filings in Cybozu, Inc. (4776), most recently on 2026-01-19. 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 Cybozu, Inc. have?: Cybozu, Inc. has 5 buy-side and 2 sell-side disclosures on record, covering ¥25.3B ($163.3M) in total reported value, spanning 2021-07-30 to 2026-01-19.
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.