Who has been buying Koshidaka Holdings Co., Ltd. stock?

12 distinct investors have filed 26 disclosed large-shareholding filings in Koshidaka Holdings Co., Ltd. (2157), most recently on 2026-05-13. 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 Koshidaka Holdings Co., Ltd. have?

Koshidaka Holdings Co., Ltd. has 26 buy-side and 21 sell-side disclosures on record, covering ¥70.4B ($454.2M) in total reported value, spanning 2021-05-21 to 2026-05-13.

Where does StockDrifts get Koshidaka Holdings 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.

Koshidaka Holdings Co., Ltd. 2157

Company

株式会社コシダカホールディングスKoshidaka Holdings Co., Ltd.

Investors

Buys

Total Value

¥70.4B ($454.2M)

Avg Return

+1.64%

Last Filing

2026-05-13

Koshidaka Holdings Co., Ltd. (2157) has 26 disclosed large-shareholding filings and 21 disclosed disposals on record, filed by 12 distinct investors. Together those filings cover ¥70.4B ($454.2M) in reported transaction value. The earliest filing StockDrifts holds for Koshidaka Holdings Co., Ltd. is dated 2021-05-21; the most recent is 2026-05-13. 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 +1.64%, 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
2026-08-13	SELL	Market Buy	アイエックスジーエス・インク(IXGS, Inc.) IXGS, Inc.	passive	6.7M	¥1,022	-1.5%	¥895M ($5.8M)
2026-07-27	SELL	Market Buy	アイエックスジーエス・インク(IXGS, Inc.) IXGS, Inc.	passive	7.7M	¥1,067	+2.8%	¥899M ($5.8M)
2026-07-23	SELL	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 (FMR Investment Management (UK) Limited) FMR Investment Management (UK) Limited	other	5.4M	¥1,046	+0.9%	¥1.8B ($11.5M)
2026-07-07	BUY	Market Buy	SMBC日興証券株式会社	other	2.5M	¥987	+2.3%	¥58M ($375K)
2026-07-07	BUY	unknown	株式会社三井住友銀行	other	180.8K	¥987	+2.3%	¥178M ($1.2M)
2026-07-07	SELL	Market Buy	三井住友DSアセットマネジメント株式会社	passive	3.0M	¥987	-2.3%	¥1.2B ($7.8M)
2026-06-23	SELL	Market Buy	アイエックスジーエス・インク(IXGS, Inc.) IXGS, Inc.	passive	8.7M	¥933	-13.5%	¥471M ($3.0M)
2026-06-12	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	1.7M	¥971	-0.1%	¥8M ($52K)
2026-06-12	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	5.4M	¥971	+0.1%	¥1.0B ($6.5M)
2026-06-12	BUY	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	5.4M	¥971	-0.1%	¥5.2B ($33.8M)
2026-06-12	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	325.0K	¥971	-0.1%	¥316M ($2.0M)
2026-06-12	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	6.9M	¥971	-0.1%	¥903M ($5.8M)
2026-06-12	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	927.8K	¥971	-0.1%	¥48M ($309K)
2026-06-12	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	873.9K	¥971	+0.1%	¥57M ($367K)
2026-06-12	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	7.5M	¥971	-0.1%	¥57M ($367K)
2026-06-12	BUY	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	873.9K	¥971	-0.1%	¥849M ($5.5M)
2026-06-12	BUY	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	6.9M	¥971	-0.1%	¥6.7B ($43.3M)
2026-06-12	BUY	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	7.2M	¥971	-0.1%	¥7.0B ($45.0M)
2026-06-12	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	7.0M	¥971	+0.1%	¥447M ($2.9M)
2026-06-12	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	7.1M	¥971	-0.1%	¥999M ($6.4M)
2026-06-12	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	1.4M	¥971	+0.1%	¥320M ($2.1M)
2026-06-12	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	5.4M	¥971	-0.1%	¥24M ($155K)
2026-06-12	BUY	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	1.4M	¥971	-0.1%	¥1.4B ($8.8M)
2026-06-12	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	703.3K	¥971	+0.1%	¥679M ($4.4M)
2026-06-12	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	5.2M	¥971	+0.1%	¥224M ($1.4M)
2026-06-12	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	654.7K	¥971	+0.1%	¥40M ($258K)
2026-06-12	BUY	unknown	エフアイエーエムエルエルシー FIAM LLC	other	110.2K	¥971	-0.1%	¥107M ($690K)
2026-06-12	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	6.0M	¥971	-0.1%	¥815M ($5.3M)
2026-06-12	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	876.8K	¥971	-0.1%	¥216M ($1.4M)
2026-06-12	BUY	Market Buy	エフアイエーエムエルエルシー FIAM LLC	other	113.5K	¥971	-0.1%	¥8M ($52K)
2026-06-12	BUY	unknown	エフアイエーエムエルエルシー FIAM LLC	other	113.5K	¥971	-0.1%	¥110M ($711K)
2026-06-12	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	7.2M	¥971	-0.1%	¥240M ($1.5M)
2026-06-12	BUY	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	927.8K	¥971	-0.1%	¥901M ($5.8M)
2026-06-12	BUY	unknown	エフアイエーエムエルエルシー FIAM LLC	other	113.5K	¥971	-0.1%	¥110M ($711K)
2026-06-12	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	927.8K	¥971	+0.1%	¥16M ($105K)
2026-06-12	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	7.5M	¥971	-0.1%	¥130M ($840K)
2026-06-12	BUY	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	927.8K	¥971	-0.1%	¥901M ($5.8M)
2026-06-12	BUY	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	7.5M	¥971	-0.1%	¥7.2B ($46.7M)
2026-06-12	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	7.5M	¥971	+0.1%	¥8M ($52K)
2026-06-12	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	480.0K	¥971	+0.1%	¥382M ($2.5M)
2026-06-12	BUY	unknown	エフアイエーエムエルエルシー FIAM LLC	other	143.5K	¥971	-0.1%	¥139M ($899K)
2026-06-12	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	6.9M	¥971	+0.1%	¥114M ($735K)
2026-06-12	BUY	unknown	エフアイエーエムエルエルシー FIAM LLC	other	143.5K	¥971	-0.1%	¥139M ($899K)
2026-05-13	BUY	unknown	株式会社ふくる	activist	8.4M	¥1,002	-6.0%	¥8.4B ($54.1M)
2026-05-13	BUY	negotiated	腰髙美和子	activist	664.0K	¥1,002	-6.0%	¥665M ($4.3M)
2026-05-13	SELL	unknown	ヨウザン株式会社	unknown	0	¥1,002	+6.0%	¥22.6B ($146.0M)
2026-05-13	BUY	negotiated	腰髙博	activist	50.0K	¥1,002	-6.0%	¥50M ($323K)
2026-05-13	BUY	negotiated	腰髙美和子	activist	664.0K	¥1,002	-6.0%	¥665M ($4.3M)
2026-05-13	BUY	unknown	株式会社ヨウザン	strategic	22.6M	¥1,002	-6.0%	¥22.6B ($146.0M)
2026-05-13	BUY	unknown	株式会社ヨウザン	strategic	22.6M	¥1,002	-6.0%	¥22.6B ($146.0M)

Showing the 50 most recent of 116 filings.

Frequently asked questions

Who has been buying Koshidaka Holdings Co., Ltd. stock?: 12 distinct investors have filed 26 disclosed large-shareholding filings in Koshidaka Holdings Co., Ltd. (2157), most recently on 2026-05-13. 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 Koshidaka Holdings Co., Ltd. have?: Koshidaka Holdings Co., Ltd. has 26 buy-side and 21 sell-side disclosures on record, covering ¥70.4B ($454.2M) in total reported value, spanning 2021-05-21 to 2026-05-13.
Where does StockDrifts get Koshidaka Holdings 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 Koshidaka Holdings Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.