Who has been buying Aidma Holdings, Inc. stock?

6 distinct investors have filed 17 disclosed large-shareholding filings in Aidma Holdings, Inc. (7373), 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 Aidma Holdings, Inc. have?

Aidma Holdings, Inc. has 17 buy-side and 25 sell-side disclosures on record, covering ¥9.8B ($63.3M) in total reported value, spanning 2021-06-25 to 2026-04-22.

Where does StockDrifts get Aidma Holdings, Inc. 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.

Aidma Holdings, Inc. 7373

Company

株式会社アイドマ・ホールディングスAidma Holdings, Inc.

Investors

Buys

Total Value

¥9.8B ($63.3M)

Avg Return

-38.70%

Last Filing

2026-04-22

Aidma Holdings, Inc. (7373) has 17 disclosed large-shareholding filings and 25 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥9.8B ($63.3M) in reported transaction value. The earliest filing StockDrifts holds for Aidma Holdings, Inc. is dated 2021-06-25; 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 -38.70%, 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
2026-08-07	BUY	unknown	JPM株式会社	activist	6.0M	¥912	+5.3%	¥5.5B ($35.3M)
2026-08-07	BUY	negotiated	三浦陽平	activist	3.3M	¥912	+5.3%	¥3.0B ($19.5M)
2026-07-28	SELL	unknown	アセンダー・キャピタル・リミテッド(Ascender Capital Limited) Ascender Capital Limited	activist	595.5K	¥980	+2.0%	¥176M ($1.1M)
2026-07-14	SELL	unknown	JPM株式会社	activist	6.0M	¥1,005	+5.2%	¥3M ($20K)
2026-07-14	SELL	negotiated	三浦陽平	activist	3.3M	¥1,005	+5.2%	¥2M ($10K)
2026-06-26	BUY	unknown	JPM株式会社	activist	6.0M	¥1,148	-13.4%	¥6.9B ($44.4M)
2026-06-26	SELL	negotiated	三浦陽平	activist	3.3M	¥1,148	+13.4%	¥167M ($1.1M)
2026-05-15	BUY	unknown	アセンダー・キャピタル・リミテッド(Ascender Capital Limited) Ascender Capital Limited	activist	774.2K	¥1,169	-0.9%	¥905M ($5.8M)
2026-04-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	607.5K	¥1,320	+7.9%	¥220M ($1.4M)
2026-04-13	BUY	unknown	JPM株式会社	activist	6.0M	¥1,324	-5.8%	¥7.9B ($51.3M)
2026-04-13	BUY	unknown	三浦陽平	activist	3.5M	¥1,324	-5.8%	¥4.6B ($29.6M)
2026-04-07	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	2.1K	¥1,758	+29.9%	¥51M ($330K)
2026-04-07	SELL	unknown	アセットマネジメントOne株式会社	other	774.8K	¥1,758	+29.9%	¥234M ($1.5M)
2026-04-06	BUY	unknown	JPM株式会社	activist	6.0M	¥1,747	-29.5%	¥10.5B ($67.6M)
2026-04-06	BUY	unknown	三浦陽平	activist	3.5M	¥1,747	-29.5%	¥6.0B ($39.0M)
2026-02-26	BUY	negotiated	JPM株式会社	activist	6.0M	¥1,881	+25.5%	¥8.4B ($54.3M)
2026-02-26	SELL	negotiated	三浦陽平	activist	3.5M	¥1,881	+25.5%	¥4.9B ($31.3M)
2025-10-02	BUY	negotiated	JPM株式会社 JPM Co., Ltd.	activist	6.0M	¥2,640	-46.9%	¥15.8B ($102.2M)
2025-10-02	BUY	negotiated	三浦陽平 MIURA YOHEI	activist	3.6M	¥2,640	-46.9%	¥9.5B ($61.4M)
2025-09-02	SELL	negotiated	JPM株式会社 JPM Co., Ltd.	activist	6.0M	¥2,644	+47.0%	¥4M ($26K)
2025-09-02	SELL	negotiated	三浦陽平 MIURA YOHEI	activist	3.6M	¥2,644	+47.0%	¥324M ($2.1M)
2025-04-21	SELL	negotiated	JPM株式会社 JPM Co., Ltd.	activist	6.0M	¥1,662	+15.6%	¥41M ($263K)
2025-04-21	SELL	negotiated	三浦陽平 MIURA YOHEI	activist	3.7M	¥1,662	+15.6%	¥272M ($1.8M)
2025-02-07	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	31.2K	¥1,878	-25.4%	¥59M ($378K)
2025-02-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	906.5K	¥1,878	+25.4%	¥359M ($2.3M)
2024-08-21	SELL	negotiated	JPM株式会社 JPM Co., Ltd.	activist	6.0M	¥1,520	+7.8%	¥7M ($45K)
2024-08-21	SELL	negotiated	三浦陽平 MIURA YOHEI	activist	3.9M	¥1,520	+7.8%	¥225M ($1.5M)
2024-07-17	BUY	negotiated	JPM株式会社 JPM Co., Ltd.	activist	6.0M	¥1,620	-13.5%	¥9.7B ($62.7M)
2024-07-17	BUY	negotiated	三浦陽平 MIURA YOHEI	activist	4.0M	¥1,620	-13.5%	¥6.5B ($42.0M)
2024-04-22	SELL	negotiated	JPM株式会社 JPM Co., Ltd.	activist	6.0M	¥1,665	+15.8%	¥8M ($49K)
2024-04-22	SELL	negotiated	三浦陽平 MIURA YOHEI	activist	4.0M	¥1,665	+15.8%	¥5M ($33K)
2024-04-22	SELL	negotiated	JPM株式会社 JPM Co., Ltd.	activist	6.0M	¥1,665	+15.8%	¥8M ($49K)
2024-04-22	SELL	negotiated	三浦陽平 MIURA YOHEI	activist	4.0M	¥1,665	+15.8%	¥5M ($33K)
2024-02-22	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	30.3K	¥1,899	-26.2%	¥17M ($112K)
2024-02-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	1.1M	¥1,899	-26.2%	¥333M ($2.1M)
2024-02-22	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	8.0K	¥1,899	-26.2%	¥1.4B ($8.8M)
2024-01-22	BUY	Market Buy	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	918.5K	¥2,018	-30.5%	¥341M ($2.2M)
2024-01-22	BUY	Market Buy	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	39.0K	¥2,018	-30.5%	¥9M ($60K)
2024-01-22	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	21.2K	¥2,018	-30.5%	¥3M ($20K)
2023-07-24	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	20.5K	¥2,326	-39.7%	¥48M ($308K)
2023-07-24	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	749.4K	¥2,326	-39.7%	¥1.7B ($11.2M)
2023-07-24	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	34.5K	¥2,326	-39.7%	¥80M ($518K)
2023-06-07	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	8.0K	¥2,513	+44.2%	¥138M ($889K)
2023-06-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	391.4K	¥2,513	-44.2%	¥962M ($6.2M)
2023-04-20	BUY	negotiated	JPM株式会社 JPM Co., Ltd.	activist	6.0M	¥3,030	-53.7%	¥18.2B ($117.3M)
2023-04-20	BUY	negotiated	JPM株式会社 JPM Co., Ltd.	activist	6.0M	¥3,030	-53.7%	¥18.2B ($117.3M)
2023-04-20	SELL	negotiated	JPM株式会社 JPM Co., Ltd.	activist	6.0M	¥3,030	+53.7%	¥32M ($208K)
2023-04-20	SELL	negotiated	三浦陽平 MIURA YOHEI	activist	4.4M	¥3,030	+53.7%	¥558M ($3.6M)
2023-04-20	SELL	negotiated	三浦陽平 MIURA YOHEI	activist	4.3M	¥3,030	+53.7%	¥494M ($3.2M)
2023-04-20	SELL	negotiated	三浦陽平 MIURA YOHEI	activist	4.0M	¥3,030	+53.7%	¥794M ($5.1M)

Showing the 50 most recent of 62 filings.

Frequently asked questions

Who has been buying Aidma Holdings, Inc. stock?: 6 distinct investors have filed 17 disclosed large-shareholding filings in Aidma Holdings, Inc. (7373), 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 Aidma Holdings, Inc. have?: Aidma Holdings, Inc. has 17 buy-side and 25 sell-side disclosures on record, covering ¥9.8B ($63.3M) in total reported value, spanning 2021-06-25 to 2026-04-22.
Where does StockDrifts get Aidma Holdings, Inc. 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 Aidma Holdings, Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.