Who has been buying Yamabiko Corporation stock?

10 distinct investors have filed 6 disclosed large-shareholding filings in Yamabiko Corporation (6250), most recently on 2025-09-19. 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 Yamabiko Corporation have?

Yamabiko Corporation has 6 buy-side and 8 sell-side disclosures on record, covering ¥7.5B ($48.1M) in total reported value, spanning 2023-04-07 to 2025-09-19.

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.

Yamabiko Corporation 6250

Company

株式会社やまびこYamabiko Corporation

Investors

Buys

Total Value

¥7.5B ($48.1M)

Avg Return

+76.20%

Last Filing

2025-09-19

Yamabiko Corporation (6250) has 6 disclosed large-shareholding filings and 8 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥7.5B ($48.1M) in reported transaction value. The earliest filing StockDrifts holds for Yamabiko Corporation is dated 2023-04-07; the most recent is 2025-09-19. Across these filings the average return since disclosure is +76.20%, 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
2026-06-29	BUY	negotiated	株式会社三菱UFJ銀行	strategic	1.0M	¥3,875	-	-
2026-06-29	SELL	Market Buy	三菱UFJ信託銀行株式会社	passive	900.7K	¥3,875	-14.2%	¥410M ($2.6M)
2026-06-29	BUY	Market Buy	三菱UFJアセットマネジメント株式会社	passive	659.4K	¥3,875	+14.2%	¥1.8B ($11.4M)
2026-06-29	BUY	unknown	三菱UFJモルガン・スタンレー証券株式会社	other	76.9K	¥3,875	-	¥298M ($1.9M)
2025-09-19	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	1.6M	¥2,573	-	-
2025-09-19	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	1.0M	¥2,573	+72.0%	¥68M ($439K)
2025-09-19	SELL	negotiated	アモーヴァ・アセットマネジメント株式会社 Amova Asset Management Co., Ltd.	other	531.9K	¥2,573	-72.0%	¥227M ($1.5M)
2025-04-22	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	13.7K	¥2,022	+118.8%	¥1.7B ($11.1M)
2025-04-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	700.6K	¥2,022	-	-
2025-04-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	2.2M	¥2,022	-	-
2025-04-07	BUY	Market Buy	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	2.2M	¥1,814	-	-
2025-04-07	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	471.6K	¥1,814	+143.9%	¥728M ($4.7M)
2025-04-07	SELL	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	702.6K	¥1,814	-143.9%	¥88M ($568K)
2024-10-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	2.2M	¥2,509	-	-
2024-10-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	71.7K	¥2,509	-76.4%	¥985M ($6.4M)
2024-10-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	749.0K	¥2,509	-76.4%	¥11M ($71K)
2024-09-24	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	2.2M	¥2,445	-	-
2024-09-24	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	465.1K	¥2,445	-	¥1.1B ($7.3M)
2024-09-24	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	753.0K	¥2,445	+81.0%	¥485M ($3.1M)
2024-07-29	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	1.0M	¥2,098	-	-
2024-07-29	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.0M	¥2,098	-110.9%	¥167M ($1.1M)
2024-07-29	BUY	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	204.8K	¥2,098	+110.9%	¥120M ($776K)
2024-07-29	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.	other	22.9K	¥2,098	+110.9%	¥4.5B ($28.7M)
2023-11-08	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	2.2M	¥1,383	-	-
2023-11-08	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	2.2K	¥1,383	-220.0%	¥543M ($3.5M)
2023-11-08	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	556.3K	¥1,383	-220.0%	¥79M ($512K)
2023-04-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	2.2M	¥1,267	-	-
2023-04-07	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	391.0K	¥1,267	-	¥495M ($3.2M)
2023-04-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	611.6K	¥1,267	-249.3%	¥464M ($3.0M)

Frequently asked questions

Who has been buying Yamabiko Corporation stock?: 10 distinct investors have filed 6 disclosed large-shareholding filings in Yamabiko Corporation (6250), most recently on 2025-09-19. 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 Yamabiko Corporation have?: Yamabiko Corporation has 6 buy-side and 8 sell-side disclosures on record, covering ¥7.5B ($48.1M) in total reported value, spanning 2023-04-07 to 2025-09-19.
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.