Who has been buying Mitani Sekisan Co., Ltd. stock?

3 distinct investors have filed 2 disclosed large-shareholding filings in Mitani Sekisan Co., Ltd. (5273), most recently on 2026-04-13. 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 Sekisan Co., Ltd. have?

Mitani Sekisan Co., Ltd. has 2 buy-side and 3 sell-side disclosures on record, covering ¥695M ($4.5M) in total reported value, spanning 2021-11-22 to 2026-04-13.

Where does StockDrifts get Mitani Sekisan Co., 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.

Mitani Sekisan Co., Ltd. 5273

Company

三谷セキサン株式会社Mitani Sekisan Co., Ltd.

Investors

Buys

Total Value

¥695M ($4.5M)

Avg Return

+13.32%

Last Filing

2026-04-13

Mitani Sekisan Co., Ltd. (5273) has 2 disclosed large-shareholding filings and 3 disclosed disposals on record, filed by 3 distinct investors. Together those filings cover ¥695M ($4.5M) in reported transaction value. The earliest filing StockDrifts holds for Mitani Sekisan Co., Ltd. is dated 2021-11-22; the most recent is 2026-04-13. 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 +13.32%, 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
2026-06-19	BUY	unknown	エフアイエーエムエルエルシー FIAM LLC	other	87.0K	¥1,448	+20.2%	¥126M ($813K)
2026-06-19	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	190.5K	¥1,448	+20.2%	¥276M ($1.8M)
2026-06-19	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	1.7M	¥1,448	-20.2%	¥474M ($3.1M)
2026-06-19	SELL	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	152.0K	¥1,448	-20.2%	¥54M ($350K)
2026-06-19	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	1.4M	¥1,448	-20.2%	¥405M ($2.6M)
2026-06-19	SELL	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	135.3K	¥1,448	-20.2%	¥25M ($163K)
2026-06-19	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	1.2M	¥1,448	-20.2%	¥380M ($2.5M)
2026-06-19	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	168.4K	¥1,448	+20.2%	¥79M ($510K)
2026-06-19	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	1.1M	¥1,448	+20.2%	¥140M ($902K)
2026-04-13	BUY	unknown	三谷滋子	other	866.2K	¥1,834	-6.5%	¥381M ($2.5M)
2026-04-13	SELL	unknown	三谷宏治(相続人代表三谷滋子)	other	0	¥1,834	+6.5%	¥951M ($6.1M)
2025-04-07	BUY	Market Buy	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	1.3M	¥1,325	+33.1%	¥314M ($2.0M)
2022-05-20	SELL	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	1.3M	¥1,252.5	-40.8%	¥351M ($2.3M)
2021-11-22	SELL	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	1.6M	¥1,805	+2.3%	¥821M ($5.3M)

Frequently asked questions

Who has been buying Mitani Sekisan Co., Ltd. stock?: 3 distinct investors have filed 2 disclosed large-shareholding filings in Mitani Sekisan Co., Ltd. (5273), most recently on 2026-04-13. 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 Sekisan Co., Ltd. have?: Mitani Sekisan Co., Ltd. has 2 buy-side and 3 sell-side disclosures on record, covering ¥695M ($4.5M) in total reported value, spanning 2021-11-22 to 2026-04-13.
Where does StockDrifts get Mitani Sekisan Co., 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 Mitani Sekisan Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.