Who has been buying Maruichi Steel Tube Ltd. stock?

8 distinct investors have filed 5 disclosed large-shareholding filings in Maruichi Steel Tube Ltd. (5463), most recently on 2026-05-07. 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 Maruichi Steel Tube Ltd. have?

Maruichi Steel Tube Ltd. has 5 buy-side and 4 sell-side disclosures on record, covering ¥4.8B ($31.0M) in total reported value, spanning 2021-11-19 to 2026-05-07.

Where does StockDrifts get Maruichi Steel Tube 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.

Maruichi Steel Tube Ltd. 5463

Company

丸一鋼管株式会社Maruichi Steel Tube Ltd.

Investors

Buys

Total Value

¥4.8B ($31.0M)

Avg Return

+34.30%

Last Filing

2026-05-07

Maruichi Steel Tube Ltd. (5463) has 5 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥4.8B ($31.0M) in reported transaction value. The earliest filing StockDrifts holds for Maruichi Steel Tube Ltd. is dated 2021-11-19; the most recent is 2026-05-07. 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 +34.30%, 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
2026-05-07	BUY	unknown	有限会社吉村興産	strategic	3.6M	¥1,496	+10.3%	¥5.4B ($35.0M)
2026-05-07	BUY	unknown	株式会社ヨシムラホールディングス	strategic	14.1M	¥1,496	+10.3%	¥21.1B ($136.1M)
2026-05-07	BUY	unknown	吉村泰德	strategic	2.4M	¥1,496	+10.3%	¥3.6B ($23.2M)
2026-04-30	BUY	Market Buy	株式会社ヨシムラホールディングス	strategic	14.1M	¥1,452	+23.2%	¥4.1B ($26.7M)
2026-04-30	SELL	unknown	吉村泰德	strategic	2.4M	¥1,452	-23.2%	¥1.2B ($7.8M)
2025-03-21	BUY	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	4.5M	¥1,189.33	+24.3%	¥310M ($2.0M)
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	485.1K	¥1,212.67	+21.9%	¥357M ($2.3M)
2024-07-29	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.0M	¥1,212.67	-21.9%	¥927M ($6.0M)
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	20.8K	¥1,212.67	+21.9%	¥1.9B ($12.4M)
2024-07-29	SELL	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	3.3M	¥1,212.67	-21.9%	¥204M ($1.3M)
2024-01-05	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	4.2M	¥1,235.33	-19.7%	¥1.1B ($6.9M)
2021-11-19	BUY	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	5.7M	¥862.33	+71.5%	¥835M ($5.4M)

Frequently asked questions

Who has been buying Maruichi Steel Tube Ltd. stock?: 8 distinct investors have filed 5 disclosed large-shareholding filings in Maruichi Steel Tube Ltd. (5463), most recently on 2026-05-07. 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 Maruichi Steel Tube Ltd. have?: Maruichi Steel Tube Ltd. has 5 buy-side and 4 sell-side disclosures on record, covering ¥4.8B ($31.0M) in total reported value, spanning 2021-11-19 to 2026-05-07.
Where does StockDrifts get Maruichi Steel Tube 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 Maruichi Steel Tube Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.