Who has been buying Cube System Inc. stock?

8 distinct investors have filed 16 disclosed large-shareholding filings in Cube System Inc. (2335), most recently on 2026-03-26. 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 Cube System Inc. have?

Cube System Inc. has 16 buy-side and 7 sell-side disclosures on record, covering ¥6.2B ($40.1M) in total reported value, spanning 2021-07-05 to 2026-03-26.

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.

Cube System Inc. 2335

Company

株式会社キューブシステムCube System Inc.

Investors

Buys

Total Value

¥6.2B ($40.1M)

Avg Return

-0.81%

Last Filing

2026-03-26

Cube System Inc. (2335) has 16 disclosed large-shareholding filings and 7 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥6.2B ($40.1M) in reported transaction value. The earliest filing StockDrifts holds for Cube System Inc. is dated 2021-07-05; the most recent is 2026-03-26. Across these filings the average return since disclosure is -0.81%, 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
2026-03-26	SELL	unknown	﨑山收(相続人代表﨑山富子)	unknown	0	¥1,044	-5.5%	¥995M ($6.4M)
2026-03-26	SELL	unknown	﨑山收	unknown	0	¥1,044	-5.5%	¥995M ($6.4M)
2026-03-26	BUY	unknown	﨑山富子	other	593.3K	¥1,044	+5.5%	¥495M ($3.2M)
2026-03-26	BUY	unknown	﨑山富子	other	593.3K	¥1,044	+5.5%	¥495M ($3.2M)
2024-05-16	BUY	negotiated	﨑山收 Sakiyama Osamu	activist	953.1K	¥1,092	+0.8%	¥1.0B ($6.6M)
2024-05-16	SELL	negotiated	﨑山富子 Tomiko Sakiyama	activist	119.0K	¥1,092	-0.8%	¥10M ($67K)
2022-12-28	BUY	Market Buy	株式会社野村総合研究所 Nomura Research Institute, Ltd.	other	3.2M	¥1,027	+7.2%	¥1.5B ($9.9M)
2022-12-19	SELL	unknown	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	96.9K	¥1,084	-1.6%	¥9M ($61K)
2022-12-19	SELL	unknown	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	unknown	0	¥1,084	-1.6%	¥280M ($1.8M)
2022-12-19	BUY	unknown	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	52.3K	¥1,084	+1.6%	¥9M ($61K)
2022-12-19	SELL	unknown	auカブコム証券株式会社 Mitsubishi UFJ Financial Group Inc.	other	18.0K	¥1,084	-1.6%	¥3M ($20K)
2022-12-19	SELL	unknown	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	150.8K	¥1,084	-1.6%	¥178M ($1.1M)
2022-12-15	BUY	Market Buy	株式会社野村総合研究所 Nomura Research Institute, Ltd.	other	1.5M	¥1,113	-1.1%	¥825M ($5.3M)
2022-12-14	BUY	negotiated	﨑山收 Sakiyama Osamu	activist	1.1M	¥1,075	+2.4%	¥1.2B ($7.7M)
2022-12-14	BUY	negotiated	﨑山收 Sakiyama Osamu	activist	1.1M	¥1,075	+2.4%	¥1.2B ($7.7M)
2022-12-14	BUY	negotiated	﨑山富子 Tomiko Sakiyama	activist	119.0K	¥1,075	+2.4%	¥19M ($121K)
2022-12-14	BUY	negotiated	﨑山富子 Tomiko Sakiyama	activist	119.0K	¥1,075	+2.4%	¥19M ($121K)
2022-12-13	BUY	unknown	株式会社野村総合研究所 Nomura Research Institute, Ltd.	other	807.2K	¥1,056	+4.3%	¥852M ($5.5M)
2021-07-05	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	258.0K	¥1,031	+6.8%	¥266M ($1.7M)
2021-07-05	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	315.2K	¥1,031	+6.8%	¥325M ($2.1M)
2021-07-05	BUY	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	44.2K	¥1,031	+6.8%	¥46M ($294K)
2021-07-05	BUY	negotiated	auカブコム証券株式会社 Mitsubishi UFJ Financial Group Inc.	other	19.7K	¥1,031	+6.8%	¥20M ($131K)
2021-07-05	BUY	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	106.0K	¥1,031	+6.8%	¥109M ($705K)

Frequently asked questions

Who has been buying Cube System Inc. stock?: 8 distinct investors have filed 16 disclosed large-shareholding filings in Cube System Inc. (2335), most recently on 2026-03-26. 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 Cube System Inc. have?: Cube System Inc. has 16 buy-side and 7 sell-side disclosures on record, covering ¥6.2B ($40.1M) in total reported value, spanning 2021-07-05 to 2026-03-26.
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.