Who has been buying Zeta Inc. stock?

4 distinct investors have filed 6 disclosed large-shareholding filings in Zeta Inc. (6031), most recently on 2025-09-01. 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 Zeta Inc. have?

Zeta Inc. has 6 buy-side and 11 sell-side disclosures on record, covering ¥1M ($7K) in total reported value, spanning 2021-04-08 to 2025-09-01.

Where does StockDrifts get Zeta Inc. 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.

Zeta Inc. 6031

Company

サイジニア株式会社Zeta Inc.

Investors

Buys

Total Value

¥1M ($7K)

Avg Return

-7.29%

Last Filing

2025-09-01

Zeta Inc. (6031) has 6 disclosed large-shareholding filings and 11 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥1M ($7K) in reported transaction value. The earliest filing StockDrifts holds for Zeta Inc. is dated 2021-04-08; the most recent is 2025-09-01. 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 -7.29%, 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
2025-09-01	BUY	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	3.8M	¥401	-28.9%	¥201M ($1.3M)
2025-09-01	SELL	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	3.8M	¥401	+28.9%	¥201M ($1.3M)
2025-08-29	BUY	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	4.3M	¥416	-31.5%	¥1.8B ($11.5M)
2025-04-14	BUY	unknown	株式会社レッドポイント redpointo,INC.	other	1.9M	¥311	-8.4%	¥597M ($3.9M)
2024-11-05	BUY	unknown	株式会社レッドポイント redpointo,INC.	other	1.9M	¥422	-32.5%	¥1M ($7K)
2024-11-05	BUY	Market Buy	株式会社レッドポイント redpointo,INC.	other	1.9M	¥422	-32.5%	¥1M ($7K)
2024-09-26	SELL	unknown	株式会社レッドポイント redpointo,INC.	other	1.9M	¥531	+46.3%	¥1M ($9K)
2024-09-26	BUY	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	4.3M	¥531	-46.3%	¥2.3B ($14.7M)
2024-09-13	BUY	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	4.3M	¥532	-46.4%	¥2.3B ($14.8M)
2024-09-12	BUY	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	4.3M	¥555	-48.6%	¥2.4B ($15.4M)
2024-09-02	BUY	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	4.3M	¥609	-53.2%	¥2.6B ($16.9M)
2024-09-02	BUY	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	4.3M	¥609	-53.2%	¥2.6B ($16.9M)
2024-08-27	SELL	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	2.1M	¥540.5	+47.3%	¥8M ($54K)
2024-07-23	SELL	unknown	株式会社レッドポイント redpointo,INC.	other	960.0K	¥481.5	+40.8%	¥22M ($144K)
2024-03-01	SELL	unknown	吉井伸一郎 Yoshii Shinichiro	activist	889.7K	¥384	+25.8%	¥12M ($76K)
2024-03-01	BUY	unknown	吉井伸一郎 Yoshii Shinichiro	activist	889.7K	¥384	-25.8%	¥12M ($76K)
2023-07-13	SELL	unknown	吉井伸一郎 Yoshii Shinichiro	activist	458.9K	¥244.75	-16.4%	¥3M ($17K)
2023-06-16	BUY	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	1.1M	¥245	+16.3%	¥263M ($1.7M)
2023-06-16	BUY	Market Buy	株式会社レッドポイント redpointo,INC.	other	500.0K	¥245	+16.3%	¥29M ($185K)
2023-06-16	BUY	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	1.1M	¥245	+16.3%	¥263M ($1.7M)
2023-06-16	BUY	unknown	株式会社レッドポイント redpointo,INC.	other	500.0K	¥245	+16.3%	¥1M ($9K)
2023-06-07	BUY	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	1.1M	¥220.25	+29.4%	¥237M ($1.5M)
2023-06-06	BUY	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	1.1M	¥217.75	+30.9%	¥57M ($370K)
2023-04-14	SELL	negotiated	ソフトバンク株式会社 SoftBank Corp.	strategic	0	¥213	-33.8%	¥269M ($1.7M)
2023-04-14	BUY	negotiated	ソフトバンク株式会社 SoftBank Corp.	strategic	0	¥213	+33.8%	¥269M ($1.7M)
2023-01-26	SELL	negotiated	ソフトバンク株式会社 SoftBank Corp.	strategic	1.3M	¥232.25	-22.7%	¥2M ($12K)
2023-01-25	BUY	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	1.1M	¥220	+29.6%	¥3M ($16K)
2023-01-25	SELL	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	1.1M	¥220	-29.6%	¥3M ($16K)
2021-11-18	SELL	unknown	吉井伸一郎 Yoshii Shinichiro	activist	233.0K	¥247.88	-15.0%	¥29M ($189K)
2021-11-18	SELL	negotiated	ソフトバンク株式会社 SoftBank Corp.	strategic	630.9K	¥247.88	-15.0%	¥86M ($552K)
2021-07-29	BUY	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	537.5K	¥349.38	-18.4%	¥188M ($1.2M)
2021-07-29	BUY	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	537.5K	¥349.38	-18.4%	¥188M ($1.2M)
2021-07-29	BUY	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	537.5K	¥349.38	-18.4%	¥6M ($36K)
2021-07-15	BUY	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	537.5K	¥356.38	-20.0%	¥192M ($1.2M)
2021-07-15	BUY	unknown	株式会社レッドポイント redpointo,INC.	other	250.0K	¥356.38	-20.0%	¥89M ($575K)
2021-07-15	BUY	Market Buy	合同会社アイ・アセットマネジメント ai.asetomanejimento,INC.	passive	537.5K	¥356.38	-20.0%	¥192M ($1.2M)
2021-07-15	BUY	unknown	株式会社レッドポイント redpointo,INC.	other	250.0K	¥356.38	-20.0%	¥89M ($575K)
2021-04-08	BUY	negotiated	SBテクノロジー株式会社 SB Technology Corp.	strategic	0	¥227.25	+25.4%	-
2021-04-08	BUY	negotiated	ソフトバンク株式会社 SoftBank Corp.	strategic	649.1K	¥227.25	+25.4%	¥148M ($952K)

Frequently asked questions

Who has been buying Zeta Inc. stock?: 4 distinct investors have filed 6 disclosed large-shareholding filings in Zeta Inc. (6031), most recently on 2025-09-01. 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 Zeta Inc. have?: Zeta Inc. has 6 buy-side and 11 sell-side disclosures on record, covering ¥1M ($7K) in total reported value, spanning 2021-04-08 to 2025-09-01.
Where does StockDrifts get Zeta Inc. 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 Zeta Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.