Who has been buying AMIYA Corporation stock?

9 distinct investors have filed 11 disclosed large-shareholding filings in AMIYA Corporation (4258), most recently on 2026-04-16. 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 AMIYA Corporation have?

AMIYA Corporation has 11 buy-side and 15 sell-side disclosures on record, covering ¥9.4B ($60.5M) in total reported value, spanning 2021-12-28 to 2026-04-16.

Where does StockDrifts get AMIYA 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.

AMIYA Corporation 4258

Company

株式会社網屋AMIYA Corporation

Investors

Buys

Total Value

¥9.4B ($60.5M)

Avg Return

+109.42%

Last Filing

2026-04-16

AMIYA Corporation (4258) has 11 disclosed large-shareholding filings and 15 disclosed disposals on record, filed by 9 distinct investors. Together those filings cover ¥9.4B ($60.5M) in reported transaction value. The earliest filing StockDrifts holds for AMIYA Corporation is dated 2021-12-28; the most recent is 2026-04-16. 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 +109.42%, 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
2026-07-22	BUY	unknown	アモーヴァ・アセットマネジメント株式会社	other	405.0K	¥4,295	+8.8%	¥1.7B ($11.2M)
2026-07-22	BUY	unknown	三井住友トラスト・アセットマネジメント株式会社	other	56.9K	¥4,295	+8.8%	¥244M ($1.6M)
2026-06-22	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	566.1K	¥3,390	+27.3%	¥356M ($2.3M)
2026-06-01	BUY	Market Buy	シンプレクス・アセット・マネジメント株式会社 Simplex Asset Management Co., Ltd.	passive	13.0K	¥3,515	-7.5%	¥46M ($295K)
2026-04-16	SELL	unknown	石田晃太 Ishida Kota	activist	1.1M	¥2,929	+5.0%	¥103M ($667K)
2026-03-23	BUY	subscription	シンプレクス・キャピタル・インベストメント株式会社 Simplex Capital Investment	passive	785.0K	¥2,884	+4.9%	¥2.3B ($14.6M)
2026-02-26	BUY	unknown	Ende Flusses合同会社	strategic	302.6K	¥2,864	+5.6%	¥915M ($5.9M)
2026-02-26	BUY	unknown	サイバーソリューションズ株式会社	strategic	562.0K	¥2,864	+5.6%	¥1.7B ($11.0M)
2026-02-19	BUY	unknown	キヤノンマーケティングジャパン株式会社 Canon Marketing Japan Inc.	strategic	1.2M	¥3,255	-7.1%	¥3.9B ($25.1M)
2026-02-18	SELL	unknown	株式会社チャクル	strategic	0	¥3,145	+3.8%	-
2026-02-18	SELL	unknown	伊藤整一	strategic	303.2K	¥3,145	+3.8%	¥917M ($5.9M)
2025-12-22	SELL	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	1.1K	¥3,035	+0.3%	¥3M ($21K)
2025-12-22	SELL	unknown	アセットマネジメントOne株式会社	other	451.1K	¥3,035	+0.3%	¥1.4B ($8.8M)
2025-08-22	SELL	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	13.2K	¥3,925	+22.9%	¥24M ($153K)
2025-08-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	548.7K	¥3,925	+22.9%	¥329M ($2.1M)
2024-09-24	BUY	Market Buy	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	9.5K	¥1,747.5	+73.1%	¥17M ($107K)
2024-09-24	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	315.4K	¥1,747.5	+73.1%	¥88M ($569K)
2024-08-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	264.8K	¥1,212.5	+149.5%	¥321M ($2.1M)
2024-08-07	BUY	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	9.5K	¥1,212.5	+149.5%	¥12M ($74K)
2024-07-17	SELL	unknown	株式会社チャクル Chakuru Co., Ltd.	strategic	1.2M	¥1,488.5	-103.2%	¥52M ($333K)
2024-07-17	SELL	unknown	伊藤整一 Seiichi Ito	strategic	151.6K	¥1,488.5	-103.2%	¥7M ($45K)
2023-09-28	BUY	Market Buy	石田晃太 Ishida Kota	activist	570.7K	¥1,130	+167.7%	¥2M ($16K)
2023-05-17	SELL	unknown	石田晃太 Ishida Kota	activist	567.2K	¥706.5	-328.2%	¥2M ($12K)
2022-12-28	SELL	unknown	株式会社チャクル Chakuru Co., Ltd.	activist	1.2M	¥490	-517.4%	¥22M ($140K)
2022-12-28	SELL	unknown	伊藤整一 Seiichi Ito	strategic	151.6K	¥490	-517.4%	¥2M ($14K)
2022-06-17	SELL	unknown	石田晃太 Ishida Kouta	activist	567.2K	¥517.5	-484.5%	¥2M ($11K)
2022-01-24	SELL	unknown	株式会社チャクル Chakuru Co., Ltd.	activist	1.2M	¥692.5	-336.8%	¥1M ($7K)
2022-01-24	SELL	unknown	伊藤整一 Seiichi Ito	strategic	151.6K	¥692.5	-336.8%	¥44M ($281K)
2021-12-28	BUY	unknown	株式会社チャクル Chakuru Co., Ltd.	activist	1.2M	¥950.5	+218.3%	¥1.1B ($7.1M)
2021-12-28	BUY	unknown	伊藤整一 Seiichi Ito	strategic	214.4K	¥950.5	+218.3%	¥204M ($1.3M)
2021-12-28	BUY	unknown	石田晃太 Ishida Kouta	activist	567.2K	¥950.5	+218.3%	¥539M ($3.5M)

Frequently asked questions

Who has been buying AMIYA Corporation stock?: 9 distinct investors have filed 11 disclosed large-shareholding filings in AMIYA Corporation (4258), most recently on 2026-04-16. 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 AMIYA Corporation have?: AMIYA Corporation has 11 buy-side and 15 sell-side disclosures on record, covering ¥9.4B ($60.5M) in total reported value, spanning 2021-12-28 to 2026-04-16.
Where does StockDrifts get AMIYA 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 AMIYA Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.