Who has been buying Zett Corporation stock?

6 distinct investors have filed 2 disclosed large-shareholding filings in Zett Corporation (8135), most recently on 2026-05-08. 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 Zett Corporation have?

Zett Corporation has 2 buy-side and 4 sell-side disclosures on record, covering ¥73M ($470K) in total reported value, spanning 2021-07-20 to 2026-05-08.

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.

Zett Corporation 8135

Company

ゼット株式会社Zett Corporation

Investors

Buys

Total Value

¥73M ($470K)

Avg Return

+52.36%

Last Filing

2026-05-08

Zett Corporation (8135) has 2 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥73M ($470K) in reported transaction value. The earliest filing StockDrifts holds for Zett Corporation is dated 2021-07-20; the most recent is 2026-05-08. Across these filings the average return since disclosure is +52.36%, 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
2026-05-08	BUY	unknown	有限会社眞徳	other	3.9M	¥428	-	¥1.7B ($10.7M)
2026-05-08	BUY	unknown	渡辺裕之	other	491.0K	¥428	-	¥210M ($1.4M)
2026-05-08	BUY	unknown	有限会社眞徳	other	3.9M	¥428	-	-
2026-05-08	BUY	unknown	渡辺裕之	other	491.0K	¥428	-	¥210M ($1.4M)
2024-11-15	SELL	unknown	ゼット共栄会理事長民秋清史 KIYOFUMI TAMIAKI	strategic	1.0M	¥343	-24.8%	¥153M ($988K)
2022-07-05	BUY	unknown	ゼット共栄会理事長民秋清史 KIYOFUMI TAMIAKI	strategic	1.5M	¥219	-	¥61M ($395K)
2022-07-05	SELL	unknown	ゼット共栄会理事長民秋清史 KIYOFUMI TAMIAKI	strategic	1.5M	¥219	-95.4%	¥61M ($395K)
2021-09-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	970.0K	¥258	-	-
2021-09-07	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	14.4K	¥258	-65.9%	¥60M ($388K)
2021-08-06	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	970.0K	¥296	+44.6%	¥287M ($1.9M)
2021-08-06	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	246.3K	¥296	+44.6%	¥73M ($470K)
2021-07-20	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	921.4K	¥299	-43.1%	¥87M ($562K)

Frequently asked questions

Who has been buying Zett Corporation stock?: 6 distinct investors have filed 2 disclosed large-shareholding filings in Zett Corporation (8135), most recently on 2026-05-08. 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 Zett Corporation have?: Zett Corporation has 2 buy-side and 4 sell-side disclosures on record, covering ¥73M ($470K) in total reported value, spanning 2021-07-20 to 2026-05-08.
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.