Who has been buying Maruyama Mfg. Co., Inc. stock?

7 distinct investors have filed 2 disclosed large-shareholding filings in Maruyama Mfg. Co., Inc. (6316), most recently on 2026-02-20. 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 Maruyama Mfg. Co., Inc. have?

Maruyama Mfg. Co., Inc. has 2 buy-side and 9 sell-side disclosures on record, covering ¥40M ($259K) in total reported value, spanning 2021-11-30 to 2026-02-20.

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.

Maruyama Mfg. Co., Inc. 6316

Company

株式会社丸山製作所Maruyama Mfg. Co., Inc.

Investors

Buys

Total Value

¥40M ($259K)

Avg Return

+58.04%

Last Filing

2026-02-20

Maruyama Mfg. Co., Inc. (6316) has 2 disclosed large-shareholding filings and 9 disclosed disposals on record, filed by 7 distinct investors. Together those filings cover ¥40M ($259K) in reported transaction value. The earliest filing StockDrifts holds for Maruyama Mfg. Co., Inc. is dated 2021-11-30; the most recent is 2026-02-20. Across these filings the average return since disclosure is +58.04%, 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
2026-02-20	SELL	unknown	株式会社みずほ銀行	strategic	187.0K	¥2,412	-24.6%	¥56M ($360K)
2026-02-20	SELL	unknown	みずほ信託銀行株式会社	strategic	173.4K	¥2,412	-24.6%	¥27M ($172K)
2026-02-20	SELL	unknown	アセットマネジメントOne株式会社	unknown	0	¥2,412	-24.6%	¥47M ($305K)
2022-10-21	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	210.0K	¥1,431	-	-
2022-10-21	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	184.4K	¥1,431	-	-
2022-10-21	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	19.4K	¥1,431	-110.0%	¥34M ($218K)
2022-10-21	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	300	¥1,431	+110.0%	¥23M ($149K)
2022-09-26	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	210.0K	¥1,523	-	-
2022-09-26	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	34.0K	¥1,523	-	¥52M ($334K)
2022-09-26	SELL	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	184.4K	¥1,523	-97.3%	¥2M ($15K)
2022-09-26	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	43.1K	¥1,523	-97.3%	¥70M ($450K)
2022-07-06	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	73.4K	¥1,549	-	-
2022-07-06	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	121.2K	¥1,549	+94.0%	¥17M ($111K)
2022-07-06	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	48.6K	¥1,549	-94.0%	¥30M ($196K)
2021-11-30	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	88.8K	¥1,456	-106.4%	¥41M ($265K)
2021-11-30	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	210.0K	¥1,456	-	-
2021-11-30	SELL	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	186.3K	¥1,456	-106.4%	¥1M ($9K)

Frequently asked questions

Who has been buying Maruyama Mfg. Co., Inc. stock?: 7 distinct investors have filed 2 disclosed large-shareholding filings in Maruyama Mfg. Co., Inc. (6316), most recently on 2026-02-20. 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 Maruyama Mfg. Co., Inc. have?: Maruyama Mfg. Co., Inc. has 2 buy-side and 9 sell-side disclosures on record, covering ¥40M ($259K) in total reported value, spanning 2021-11-30 to 2026-02-20.
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.