Who has been buying A&A Material Corporation stock?

6 distinct investors have filed 1 disclosed large-shareholding filings in A&A Material Corporation (5391), most recently on 2026-03-31. 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 A&A Material Corporation have?

A&A Material Corporation has 1 buy-side and 8 sell-side disclosures on record, covering ¥6M ($36K) in total reported value, spanning 2021-12-07 to 2026-03-31.

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.

A&A Material Corporation 5391

Company

株式会社エーアンドエーマテリアルA&A Material Corporation

Investors

Buys

Total Value

¥6M ($36K)

Avg Return

+56.24%

Last Filing

2026-03-31

A&A Material Corporation (5391) has 1 disclosed large-shareholding filings and 8 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥6M ($36K) in reported transaction value. The earliest filing StockDrifts holds for A&A Material Corporation is dated 2021-12-07; the most recent is 2026-03-31. Across these filings the average return since disclosure is +56.24%, 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
2026-06-16	BUY	subscription	ロングコリドーアセットマネジメントリミテッド(Long Corridor Asset Management Limited) Long Corridor Asset Management Limited	passive	1.3M	¥1,398	+8.0%	¥1.8B ($11.7M)
2026-03-31	SELL	negotiated	太平洋セメント株式会社 TAIHEIYO CEMENT CORPORATION	strategic	1.1M	¥1,391	-8.6%	¥3.0B ($19.3M)
2023-09-25	SELL	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	122.3K	¥1,168	-29.3%	¥111M ($715K)
2023-09-25	SELL	Market Buy	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	156.4K	¥1,168	-29.3%	¥37M ($240K)
2022-05-20	SELL	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	125.8K	¥857	-76.2%	¥65M ($417K)
2022-05-20	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	107.6K	¥857	-	-
2022-05-20	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	85.6K	¥857	-76.2%	¥4M ($26K)
2022-01-21	SELL	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	other	107.6K	¥905	-66.8%	¥28M ($182K)
2022-01-21	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	201.3K	¥905	-	-
2022-01-21	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	90.0K	¥905	+66.8%	¥6M ($36K)
2021-12-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	201.3K	¥918	-	-
2021-12-07	SELL	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	138.7K	¥918	-64.5%	¥52M ($336K)
2021-12-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	83.8K	¥918	-64.5%	¥23M ($147K)

Frequently asked questions

Who has been buying A&A Material Corporation stock?: 6 distinct investors have filed 1 disclosed large-shareholding filings in A&A Material Corporation (5391), most recently on 2026-03-31. 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 A&A Material Corporation have?: A&A Material Corporation has 1 buy-side and 8 sell-side disclosures on record, covering ¥6M ($36K) in total reported value, spanning 2021-12-07 to 2026-03-31.
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.