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

19 distinct investors have filed 17 disclosed large-shareholding filings in The Chiba Bank, Ltd. (8331), most recently on 2025-05-20. 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 Chiba Bank, Ltd. have?

The Chiba Bank, Ltd. has 17 buy-side and 10 sell-side disclosures on record, covering ¥52.2B ($336.8M) in total reported value, spanning 2021-04-07 to 2025-05-20.

Where does StockDrifts get The Chiba Bank, Ltd. 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.

The Chiba Bank, Ltd. 8331

Company

株式会社千葉銀行The Chiba Bank, Ltd.

Investors

Buys

Total Value

¥52.2B ($336.8M)

Avg Return

+155.03%

Last Filing

2025-05-20

The Chiba Bank, Ltd. (8331) has 17 disclosed large-shareholding filings and 10 disclosed disposals on record, filed by 19 distinct investors. Together those filings cover ¥52.2B ($336.8M) in reported transaction value. The earliest filing StockDrifts holds for The Chiba Bank, Ltd. is dated 2021-04-07; the most recent is 2025-05-20. 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 +155.03%, 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
2026-06-19	SELL	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	1.5M	¥2,491	-1.8%	¥8.1B ($52.3M)
2026-06-19	SELL	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	31.6M	¥2,491	-1.8%	¥14.3B ($92.2M)
2025-05-20	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	38.9M	¥1,280	+69.3%	¥49.7B ($320.8M)
2025-05-20	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	4.9M	¥1,280	+69.3%	¥6.3B ($40.7M)
2024-01-05	BUY	Market Buy	ブラックロック・ファンド・マネジャーズ・リミテッド BlackRock Fund Managers Limited	passive	1.6M	¥1,044.5	+107.5%	¥1.7B ($11.0M)
2024-01-05	BUY	Market Buy	ブラックロック・インスティテューショナル・トラスト・カンパニー、エヌ.エイ.(BlackRock Institutional Trust Company BlackRock Institutional Trust Company, N.A.	passive	8.2M	¥1,044.5	+107.5%	¥8.6B ($55.2M)
2024-01-05	BUY	Market Buy	ブラックロック・ファンド・アドバイザーズ BlackRock Fund Advisors	passive	13.4M	¥1,044.5	+107.5%	¥13.9B ($90.0M)
2024-01-05	BUY	Market Buy	ブラックロック・アセット・マネジメント・アイルランド・リミテッド BlackRock Asset Management Ireland Limited	passive	3.9M	¥1,044.5	+107.5%	¥4.1B ($26.6M)
2024-01-05	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	1.2M	¥1,044.5	+107.5%	¥1.2B ($7.8M)
2024-01-05	BUY	Market Buy	ブラックロック・ジャパン株式会社 BlackRock Japan Co., Ltd.	passive	12.5M	¥1,044.5	+107.5%	¥13.1B ($84.4M)
2023-07-06	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	16.5M	¥894.5	-142.3%	¥7.0B ($45.2M)
2023-07-06	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	13.6M	¥894.5	-142.3%	¥1.4B ($8.9M)
2023-07-06	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	4.0M	¥894.5	+142.3%	¥3.6B ($23.1M)
2022-10-03	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.	strategic	3.1M	¥771	+181.1%	¥1.6B ($10.1M)
2022-10-03	BUY	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	7.2M	¥771	+181.1%	¥1.3B ($8.5M)
2022-10-03	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	15.3M	¥771	-181.1%	¥6.5B ($42.2M)
2022-10-03	SELL	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	14.2M	¥771	-181.1%	¥1.9B ($12.6M)
2022-07-25	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	36.0M	¥731	-196.5%	¥2.4B ($15.4M)
2022-07-25	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	447.3K	¥731	+196.5%	¥25.5B ($164.2M)
2022-07-25	SELL	unknown	野村ホールディングス株式会社 Nomura Holdings, Inc.	strategic	100	¥731	-196.5%	¥4.2B ($26.9M)
2022-07-25	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	5.8M	¥731	+196.5%	¥4.2B ($27.2M)
2021-12-21	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	15.2M	¥667	-225.0%	¥54M ($351K)
2021-12-21	SELL	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	4.0M	¥667	-225.0%	¥1.3B ($8.1M)
2021-12-21	BUY	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	24.3M	¥667	+225.0%	¥435M ($2.8M)
2021-11-19	BUY	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	15.3M	¥675	+221.1%	¥440M ($2.8M)
2021-11-19	BUY	Market Buy	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	23.6M	¥675	+221.1%	¥661M ($4.3M)
2021-11-19	BUY	Market Buy	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	5.9M	¥675	+221.1%	¥1.3B ($8.2M)
2021-04-07	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	39.3M	¥717	-202.3%	¥409M ($2.6M)
2021-04-07	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	5.9M	¥717	-202.3%	¥1.6B ($10.2M)
2021-04-07	BUY	unknown	野村ホールディングス株式会社 Nomura Holdings, Inc.	strategic	5.7M	¥717	+202.3%	¥4.1B ($26.4M)
2021-04-07	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	224.0K	¥717	+202.3%	¥13.2B ($84.9M)

Frequently asked questions

Who has been buying The Chiba Bank, Ltd. stock?: 19 distinct investors have filed 17 disclosed large-shareholding filings in The Chiba Bank, Ltd. (8331), most recently on 2025-05-20. 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 Chiba Bank, Ltd. have?: The Chiba Bank, Ltd. has 17 buy-side and 10 sell-side disclosures on record, covering ¥52.2B ($336.8M) in total reported value, spanning 2021-04-07 to 2025-05-20.
Where does StockDrifts get The Chiba Bank, Ltd. 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 The Chiba Bank, Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.