Who has been buying Mitsubishi Paper Mills Limited stock?

1 distinct investors have filed 2 disclosed large-shareholding filings in Mitsubishi Paper Mills Limited (3864), most recently on 2025-08-15. 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 Mitsubishi Paper Mills Limited have?

Mitsubishi Paper Mills Limited has 2 buy-side and 0 sell-side disclosures on record, covering ¥359M ($2.3M) in total reported value, spanning 2025-07-30 to 2025-08-15.

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.

Mitsubishi Paper Mills Limited 3864

Company

三菱製紙株式会社Mitsubishi Paper Mills Limited

Investors

Buys

Total Value

¥359M ($2.3M)

Avg Return

+47.07%

Last Filing

2025-08-15

Mitsubishi Paper Mills Limited (3864) has 2 disclosed large-shareholding filings and 0 disclosed disposals on record, filed by 1 distinct investors. Together those filings cover ¥359M ($2.3M) in reported transaction value. The earliest filing StockDrifts holds for Mitsubishi Paper Mills Limited is dated 2025-07-30; the most recent is 2025-08-15. Across these filings the average return since disclosure is +47.07%, 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
2026-08-05	BUY	unknown	株式会社シティインデックスイレブンス	activist	100	¥1,174	-	-
2026-08-05	BUY	Market Buy	株式会社C&I Holdings	activist	2.6M	¥1,174	+4.6%	¥567M ($3.7M)
2026-08-05	BUY	unknown	株式会社Mホールディングス	activist	145.7K	¥1,174	-	-
2026-07-30	BUY	Market Buy	ウィル・フィールド・キャピタル・ピーティーイー・エルティーディー(WILL FIELD CAPITAL PTE.LTD.) WILL FIELD CAPITAL PTE.LTD.	passive	3.2M	¥1,117	-	-
2026-07-21	BUY	unknown	株式会社シティインデックスイレブンス	activist	100	¥1,226	+0.2%	¥123K ($791)
2026-07-21	BUY	unknown	株式会社C&I Holdings	activist	2.1M	¥1,226	+0.2%	¥2.6B ($16.7M)
2026-07-21	BUY	unknown	株式会社Mホールディングス	activist	145.7K	¥1,226	+0.2%	¥179M ($1.2M)
2026-05-18	BUY	Market Buy	ウィル・フィールド・キャピタル・ピーティーイー・エルティーディー(WILL FIELD CAPITAL PTE.LTD.) WILL FIELD CAPITAL PTE.LTD.	passive	3.2M	¥1,036	+18.5%	¥487M ($3.1M)
2025-08-15	BUY	Market Buy	ウィル・フィールド・キャピタル・ピーティーイー・エルティーディー(WILL FIELD CAPITAL PTE.LTD.) WILL FIELD CAPITAL PTE.LTD.	passive	2.8M	¥668	+83.8%	¥359M ($2.3M)
2025-07-30	BUY	Market Buy	ウィル・フィールド・キャピタル・ピーティーイー・エルティーディー(WILL FIELD CAPITAL PTE.LTD.) WILL FIELD CAPITAL PTE.LTD.	passive	2.2M	¥654	+87.8%	¥1.5B ($9.4M)
2025-07-30	BUY	Market Buy	ウィル・フィールド・キャピタル・ピーティーイー・エルティーディー(WILL FIELD CAPITAL PTE.LTD.) WILL FIELD CAPITAL PTE.LTD.	passive	2.2M	¥654	-	¥1.5B ($9.4M)

Frequently asked questions

Who has been buying Mitsubishi Paper Mills Limited stock?: 1 distinct investors have filed 2 disclosed large-shareholding filings in Mitsubishi Paper Mills Limited (3864), most recently on 2025-08-15. 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 Mitsubishi Paper Mills Limited have?: Mitsubishi Paper Mills Limited has 2 buy-side and 0 sell-side disclosures on record, covering ¥359M ($2.3M) in total reported value, spanning 2025-07-30 to 2025-08-15.
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.