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

10 distinct investors have filed 34 disclosed large-shareholding filings in The Chiba Kogyo Bank, Ltd. (8337), most recently on 2025-04-04. 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 Kogyo Bank, Ltd. have?

The Chiba Kogyo Bank, Ltd. has 34 buy-side and 7 sell-side disclosures on record, covering ¥27.4B ($177.0M) in total reported value, spanning 2021-05-20 to 2025-04-04.

Where does StockDrifts get The Chiba Kogyo 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 Kogyo Bank, Ltd. 8337

Company

株式会社千葉興業銀行The Chiba Kogyo Bank, Ltd.

Investors

Buys

Total Value

¥27.4B ($177.0M)

Avg Return

+325.84%

Last Filing

2025-04-04

The Chiba Kogyo Bank, Ltd. (8337) has 34 disclosed large-shareholding filings and 7 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥27.4B ($177.0M) in reported transaction value. The earliest filing StockDrifts holds for The Chiba Kogyo Bank, Ltd. is dated 2021-05-20; the most recent is 2025-04-04. 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 +325.84%, 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
2025-04-04	SELL	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	984.0K	¥1,054	-103.2%	¥12.7B ($82.2M)
2025-04-04	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥1,054	+103.2%	-
2025-04-04	BUY	acquisition	株式会社千葉銀行 The Chiba Bank, Ltd.	strategic	11.8M	¥1,054	+103.2%	¥12.4B ($80.3M)
2025-01-06	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥1,467	+46.0%	-
2025-01-06	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	12.7M	¥1,467	+46.0%	¥795M ($5.1M)
2024-09-26	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥1,027	+108.6%	-
2024-09-26	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	12.1M	¥1,027	+108.6%	¥673M ($4.3M)
2024-08-29	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.1M	¥1,050	+104.0%	¥532M ($3.4M)
2024-08-29	BUY	Market Buy	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	3.0M	¥1,050	+104.0%	¥48M ($308K)
2024-08-29	BUY	Market Buy	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	7.5M	¥1,050	+104.0%	¥137M ($881K)
2024-08-13	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥979	+118.8%	-
2024-08-13	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	11.5M	¥979	+118.8%	¥635M ($4.1M)
2024-03-11	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥1,032	+107.6%	-
2024-03-11	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	10.8M	¥1,032	+107.6%	¥665M ($4.3M)
2024-01-09	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	10.2M	¥803	+166.8%	¥512M ($3.3M)
2024-01-09	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥803	+166.8%	-
2023-11-15	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥866	+147.3%	-
2023-11-15	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥866	+147.3%	-
2023-11-15	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	9.6M	¥866	+147.3%	¥575M ($3.7M)
2023-11-15	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	9.6M	¥866	+147.3%	¥575M ($3.7M)
2023-10-04	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥842	+154.4%	-
2023-10-04	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	8.9M	¥842	+154.4%	¥239M ($1.5M)
2023-07-26	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥630	+240.0%	-
2023-07-26	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	8.6M	¥630	+240.0%	¥406M ($2.6M)
2023-06-12	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥546	+292.3%	-
2023-06-12	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	8.0M	¥546	+292.3%	¥369M ($2.4M)
2023-05-29	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥480	+346.3%	-
2023-05-29	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	7.3M	¥480	+346.3%	¥334M ($2.2M)
2023-03-28	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥495	+332.7%	-
2023-03-28	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	609.4K	¥495	+332.7%	¥302M ($1.9M)
2023-03-28	BUY	Market Buy	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	3.0M	¥495	+332.7%	¥1.0B ($6.7M)
2023-03-28	BUY	Market Buy	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	7.5M	¥495	+332.7%	¥29M ($190K)
2023-03-28	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	6.6M	¥495	+332.7%	¥332M ($2.1M)
2023-03-14	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	5.9M	¥485	+341.6%	¥306M ($2.0M)
2023-03-14	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥485	+341.6%	-
2023-03-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	613.9K	¥576	-271.9%	¥246M ($1.6M)
2023-03-07	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	926.8K	¥576	+271.9%	¥8M ($50K)
2023-03-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	7.5M	¥576	+271.9%	¥4.3B ($27.5M)
2023-02-08	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥497	+331.0%	-
2023-02-08	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	5.3M	¥497	+331.0%	¥317M ($2.0M)
2023-01-16	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥476	+350.0%	-
2023-01-16	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥476	+350.0%	-
2023-01-16	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	4.7M	¥476	+350.0%	¥310M ($2.0M)
2023-01-16	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	4.7M	¥476	+350.0%	¥310M ($2.0M)
2022-12-09	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥404	+430.2%	-
2022-12-09	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥404	+430.2%	-
2022-12-09	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	4.0M	¥404	+430.2%	¥296M ($1.9M)
2022-12-09	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	4.0M	¥404	+430.2%	¥296M ($1.9M)
2022-11-17	BUY	Market Buy	ありあけキャピタル株式会社 Ariake Capital Inc.	activist	0	¥311	+588.8%	-
2022-11-17	BUY	Market Buy	アリアケ・マスター・ファンド Ariake Master Fund	activist	3.3M	¥311	+588.8%	¥1.0B ($6.6M)

Showing the 50 most recent of 59 filings.

Frequently asked questions

Who has been buying The Chiba Kogyo Bank, Ltd. stock?: 10 distinct investors have filed 34 disclosed large-shareholding filings in The Chiba Kogyo Bank, Ltd. (8337), most recently on 2025-04-04. 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 Kogyo Bank, Ltd. have?: The Chiba Kogyo Bank, Ltd. has 34 buy-side and 7 sell-side disclosures on record, covering ¥27.4B ($177.0M) in total reported value, spanning 2021-05-20 to 2025-04-04.
Where does StockDrifts get The Chiba Kogyo 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 Kogyo Bank, Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.