Who has been buying The Keiyo Bank, Ltd. stock?

7 distinct investors have filed 4 disclosed large-shareholding filings in The Keiyo Bank, Ltd. (8544), most recently on 2026-01-20. 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 The Keiyo Bank, Ltd. have?

The Keiyo Bank, Ltd. has 4 buy-side and 5 sell-side disclosures on record, covering ¥5.5B ($35.8M) in total reported value, spanning 2021-05-21 to 2026-01-20.

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.

The Keiyo Bank, Ltd. 8544

Company

株式会社京葉銀行The Keiyo Bank, Ltd.

Investors

Buys

Total Value

¥5.5B ($35.8M)

Avg Return

+30.35%

Last Filing

2026-01-20

The Keiyo Bank, Ltd. (8544) has 4 disclosed large-shareholding filings and 5 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥5.5B ($35.8M) in reported transaction value. The earliest filing StockDrifts holds for The Keiyo Bank, Ltd. is dated 2021-05-21; the most recent is 2026-01-20. Across these filings the average return since disclosure is +30.35%, 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
2026-01-20	BUY	Market Buy	ウエリントン・マネージメント・カンパニー・エルエルピー Wellington Management Company LLP	other	7.2M	¥1,861	+53.4%	¥2.6B ($16.8M)
2026-01-20	BUY	Market Buy	ウエリントン・マネージメント・インターナショナル・リミテッド Wellington Management International Ltd	other	1.3M	¥1,861	+53.4%	¥165M ($1.1M)
2025-12-03	BUY	unknown	ウエリントン・マネージメント・カンパニー・エルエルピー Wellington Management Company LLP	other	5.8M	¥1,570	+81.8%	¥9.0B ($58.3M)
2025-12-03	BUY	unknown	ウエリントン・マネージメント・インターナショナル・リミテッド Wellington Management International Ltd	other	1.2M	¥1,570	+81.8%	¥1.9B ($12.2M)
2023-03-22	SELL	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	236.0K	¥574	-397.4%	¥123M ($794K)
2023-03-22	SELL	negotiated	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	3.5M	¥574	-397.4%	¥792M ($5.1M)
2023-03-22	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.3M	¥574	-397.4%	¥92M ($595K)
2021-05-21	SELL	unknown	あいおいニッセイ同和損害保険株式会社 Aioi Nissay Dowa Insurance Co.,Ltd.	strategic	1.3M	¥421	-	¥281M ($1.8M)
2021-05-21	SELL	unknown	三井住友海上火災保険株式会社 Mitsui Sumitomo Insurance Co.,Ltd.	strategic	3.8M	¥421	-	¥427M ($2.8M)

Frequently asked questions

Who has been buying The Keiyo Bank, Ltd. stock?: 7 distinct investors have filed 4 disclosed large-shareholding filings in The Keiyo Bank, Ltd. (8544), most recently on 2026-01-20. 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 The Keiyo Bank, Ltd. have?: The Keiyo Bank, Ltd. has 4 buy-side and 5 sell-side disclosures on record, covering ¥5.5B ($35.8M) in total reported value, spanning 2021-05-21 to 2026-01-20.
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.