Who has been buying Mitani Corporation stock?

19 distinct investors have filed 11 disclosed large-shareholding filings in Mitani Corporation (8066), most recently on 2026-04-22. 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 Mitani Corporation have?

Mitani Corporation has 11 buy-side and 3 sell-side disclosures on record, covering ¥18.5B ($119.3M) in total reported value, spanning 2022-08-18 to 2026-04-22.

Where does StockDrifts get Mitani Corporation 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.

Mitani Corporation 8066

Company

三谷商事株式会社Mitani Corporation

Investors

Buys

Total Value

¥18.5B ($119.3M)

Avg Return

+29.40%

Last Filing

2026-04-22

Mitani Corporation (8066) has 11 disclosed large-shareholding filings and 3 disclosed disposals on record, filed by 19 distinct investors. Together those filings cover ¥18.5B ($119.3M) in reported transaction value. The earliest filing StockDrifts holds for Mitani Corporation is dated 2022-08-18; the most recent is 2026-04-22. 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 +29.40%, 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
2026-06-22	SELL	unknown	フィデリティ・マネジメント・アンド・リサーチ・ジャパン株式会社	other	281.8K	¥2,461	-14.3%	¥413M ($2.7M)
2026-06-22	BUY	unknown	フィデリティマネジメントトラストカンパニー Fidelity Management Trust Company	other	413.1K	¥2,461	+14.3%	¥1.0B ($6.6M)
2026-06-22	BUY	Market Buy	エフアイエーエムエルエルシー FIAM LLC	other	1.2M	¥2,461	+14.3%	¥2.2B ($14.1M)
2026-06-22	SELL	unknown	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	6.7M	¥2,461	-14.3%	¥3.4B ($21.9M)
2026-06-22	SELL	unknown	フィデリティ・マネジメント・アンド・リサーチ・ジャパン株式会社	other	110.4K	¥2,461	-14.3%	¥938M ($6.0M)
2026-06-22	BUY	unknown	エフアイエーエムエルエルシー FIAM LLC	other	85.8K	¥2,461	+14.3%	¥211M ($1.4M)
2026-06-22	BUY	Market Buy	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	2.0M	¥2,461	+14.3%	¥820M ($5.3M)
2026-06-22	BUY	Market Buy	フィデリティ・マネジメント・アンド・リサーチ・ジャパン株式会社	other	404.7K	¥2,461	+14.3%	¥470M ($3.0M)
2026-06-22	BUY	unknown	エフエムアールインベストメントマネジメントユーケーリミテッドLimited) FMR Investment Management (UK	other	350.0K	¥2,461	+14.3%	¥861M ($5.6M)
2026-06-22	BUY	Market Buy	フィデリティマネジメントトラストカンパニー Fidelity Management Trust Company	other	497.9K	¥2,461	+14.3%	¥470M ($3.0M)
2026-06-22	BUY	Market Buy	エフアイエーエムエルエルシー FIAM LLC	other	1.4M	¥2,461	+14.3%	¥1.1B ($7.4M)
2026-06-22	BUY	Market Buy	フィデリティマネジメントアンドリサーチカンパニーエルエルシー Fidelity Management & Research Company LLC	corporate	5.8M	¥2,461	+14.3%	¥1.8B ($11.4M)
2026-06-10	BUY	Market Buy	三谷聡 Akira Mitani	activist	10.9M	¥2,482	+12.3%	¥3.7B ($24.2M)
2026-06-10	BUY	Market Buy	三谷聡 Akira Mitani	activist	9.4M	¥2,482	+12.3%	¥5.4B ($34.8M)
2026-04-22	BUY	unknown	香川セキサン株式会社	unknown	4.0K	¥2,371	+9.6%	¥9M ($61K)
2026-04-22	BUY	unknown	福井システムズ株式会社	strategic	4.0K	¥2,371	+9.6%	¥9M ($61K)
2026-04-22	BUY	unknown	株式会社福井リサイクルセンター	strategic	4.0K	¥2,371	+9.6%	¥9M ($61K)
2026-04-22	BUY	unknown	東北セキサン株式会社	strategic	4.0K	¥2,371	+9.6%	¥9M ($61K)
2026-04-22	BUY	unknown	岡山セキサン株式会社	strategic	4.0K	¥2,371	+9.6%	¥9M ($61K)
2026-04-22	BUY	unknown	大牟田セキサン株式会社	strategic	4.0K	¥2,371	+9.6%	¥9M ($61K)
2026-04-22	BUY	unknown	千葉セキサン株式会社	strategic	4.0K	¥2,371	+9.6%	¥9M ($61K)
2026-04-22	BUY	unknown	三谷エンジニアリング株式会社	strategic	11.2K	¥2,371	+9.6%	¥27M ($171K)
2026-04-22	BUY	unknown	セキサンピーシー株式会社	strategic	12.0K	¥2,371	+9.6%	¥28M ($184K)
2026-04-22	BUY	Market Buy	滋賀セキサン株式会社	strategic	80.0K	¥2,371	+9.6%	¥43M ($278K)
2026-04-22	BUY	Market Buy	株式会社浦和スプリングレーンズ	strategic	96.0K	¥2,371	+9.6%	¥65M ($418K)
2026-04-22	BUY	Market Buy	東京セキサン株式会社	strategic	2.0M	¥2,371	+9.6%	¥1.1B ($7.4M)
2026-04-22	BUY	Market Buy	三谷セキサン株式会社	strategic	13.4M	¥2,371	+9.6%	¥7.7B ($49.4M)
2026-04-03	BUY	unknown	三谷滋子 Shigeko Mitani	other	4.7M	¥2,359	+13.0%	¥11.0B ($71.1M)
2026-04-03	BUY	unknown	三親会理事長三谷聡 Akira Mitani	other	1.7M	¥2,359	+13.0%	¥4.0B ($25.7M)
2026-04-03	SELL	unknown	三親会 Sanshinkai	other	0	¥2,359	-13.0%	¥4.0B ($25.5M)
2026-04-03	SELL	unknown	三谷宏治(相続人代表三谷滋子)	other	0	¥2,359	-13.0%	¥6.4B ($41.4M)
2026-04-03	SELL	unknown	三谷滋子	other	0	¥2,359	-13.0%	¥4.8B ($31.0M)
2024-11-08	BUY	Market Buy	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	8.5M	¥1,860	+25.6%	¥3.4B ($21.8M)
2022-08-18	BUY	Market Buy	ゲイトウェイ・コンピュータ株式会社 Gateway Computer Co., Ltd.	strategic	4.0K	¥1,510	+54.7%	¥6M ($39K)
2022-08-18	BUY	Market Buy	福井システムズ株式会社 Fukui Systems Co., Ltd.	strategic	4.0K	¥1,510	+54.7%	¥6M ($39K)
2022-08-18	BUY	Market Buy	株式会社福井リサイクルセンター Fukui Recycling Center Co., Ltd.	strategic	4.0K	¥1,510	+54.7%	¥6M ($39K)
2022-08-18	BUY	Market Buy	東北セキサン株式会社 Tohoku Sekisan Co., Ltd.	strategic	4.0K	¥1,510	+54.7%	¥6M ($39K)
2022-08-18	BUY	Market Buy	岡山セキサン株式会社 Okayama Sekisan Co., Ltd.	strategic	4.0K	¥1,510	+54.7%	¥6M ($39K)
2022-08-18	BUY	Market Buy	香川セキサン株式会社 Kagawa Sekisan Co., Ltd.	strategic	4.0K	¥1,510	+54.7%	¥6M ($39K)
2022-08-18	BUY	Market Buy	大牟田セキサン株式会社 Omuta Sekisan Co., Ltd.	strategic	4.0K	¥1,510	+54.7%	¥6M ($39K)
2022-08-18	BUY	Market Buy	千葉セキサン株式会社 Chiba Sexan Co., Ltd.	strategic	4.0K	¥1,510	+54.7%	¥6M ($39K)
2022-08-18	BUY	Market Buy	三谷エンジニアリング株式会社 Mitani Engineering Co., Ltd.	strategic	11.2K	¥1,510	+54.7%	¥17M ($109K)
2022-08-18	BUY	Market Buy	セキサンピーシー株式会社 Sekisan PC Co., Ltd.	strategic	12.0K	¥1,510	+54.7%	¥18M ($117K)
2022-08-18	BUY	Market Buy	滋賀セキサン株式会社 Shiga Sekisan Co., Ltd.	strategic	80.0K	¥1,510	+54.7%	¥18M ($117K)
2022-08-18	BUY	Market Buy	株式会社浦和スプリングレーンズ Urawa Spring Lanes Co., Ltd.	strategic	96.0K	¥1,510	+54.7%	¥145M ($935K)
2022-08-18	BUY	Market Buy	東京セキサン株式会社 Tokyo Sekisan Co., Ltd.	strategic	2.0M	¥1,510	+54.7%	¥362K ($2K)
2022-08-18	BUY	Market Buy	三谷セキサン株式会社 MITANI SEKISAN Co., Ltd.	strategic	13.4M	¥1,510	+54.7%	¥65M ($422K)

Frequently asked questions

Who has been buying Mitani Corporation stock?: 19 distinct investors have filed 11 disclosed large-shareholding filings in Mitani Corporation (8066), most recently on 2026-04-22. 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 Mitani Corporation have?: Mitani Corporation has 11 buy-side and 3 sell-side disclosures on record, covering ¥18.5B ($119.3M) in total reported value, spanning 2022-08-18 to 2026-04-22.
Where does StockDrifts get Mitani Corporation 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 Mitani Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.