Who has been buying AR advanced technology, Inc. stock?

2 distinct investors have filed 6 disclosed large-shareholding filings in AR advanced technology, Inc. (5578), most recently on 2025-12-18. 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 AR advanced technology, Inc. have?

AR advanced technology, Inc. has 6 buy-side and 10 sell-side disclosures on record, covering ¥7.9B ($50.6M) in total reported value, spanning 2023-06-30 to 2025-12-18.

Where does StockDrifts get AR advanced technology, 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.

AR advanced technology, Inc. 5578

Company

ARアドバンストテクノロジ株式会社AR advanced technology, Inc.

Investors

Buys

Total Value

¥7.9B ($50.6M)

Avg Return

+62.70%

Last Filing

2025-12-18

AR advanced technology, Inc. (5578) has 6 disclosed large-shareholding filings and 10 disclosed disposals on record, filed by 2 distinct investors. Together those filings cover ¥7.9B ($50.6M) in reported transaction value. The earliest filing StockDrifts holds for AR advanced technology, Inc. is dated 2023-06-30; the most recent is 2025-12-18. 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 +62.70%, 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
2025-12-18	BUY	unknown	株式会社エスエスアール	activist	2.0M	¥1,127	-0.4%	¥2.2B ($14.3M)
2025-12-18	BUY	unknown	武内寿憲	activist	80.0K	¥1,127	-0.4%	¥90M ($584K)
2025-12-18	SELL	unknown	株式会社エスエスアール	activist	2.0M	¥1,127	-0.4%	¥2.2B ($14.3M)
2025-12-18	SELL	unknown	武内寿憲	activist	80.0K	¥1,127	-0.4%	¥90M ($584K)
2025-12-18	BUY	unknown	株式会社エスエスアール	activist	2.0M	¥1,127	-0.4%	¥2.2B ($14.3M)
2025-12-18	BUY	unknown	武内寿憲	activist	30.0K	¥1,127	-0.4%	¥34M ($219K)
2025-12-18	SELL	unknown	株式会社エスエスアール	activist	2.0M	¥1,127	-0.4%	¥2.2B ($14.3M)
2025-12-18	SELL	unknown	武内寿憲	activist	30.0K	¥1,127	-0.4%	¥34M ($219K)
2024-11-26	BUY	unknown	株式会社エスエスアール SSR Co., Ltd.	activist	2.0M	¥535	+111.4%	¥1.0B ($6.7M)
2024-11-26	BUY	unknown	株式会社エスエスアール SSR Co., Ltd.	activist	2.0M	¥535	+111.4%	¥1.0B ($6.7M)
2024-11-26	SELL	unknown	武内寿憲 Toshinori Takeuchi	activist	30.0K	¥535	-111.4%	¥27M ($173K)
2024-11-26	SELL	unknown	武内寿憲 Toshinori Takeuchi	activist	30.0K	¥535	-111.4%	¥27M ($173K)
2024-11-18	BUY	unknown	株式会社エスエスアール SSR Co., Ltd.	activist	2.0M	¥402	+181.3%	¥778M ($5.0M)
2024-11-18	BUY	unknown	株式会社エスエスアール SSR Co., Ltd.	activist	2.0M	¥402	+181.3%	¥778M ($5.0M)
2024-11-18	SELL	unknown	武内寿憲 Toshinori Takeuchi	activist	80.0K	¥402	-181.3%	¥688K ($4K)
2024-11-18	SELL	unknown	武内寿憲 Toshinori Takeuchi	activist	80.0K	¥402	-181.3%	¥688K ($4K)
2023-07-26	BUY	unknown	株式会社エスエスアール SSR Co., Ltd.	activist	2.0M	¥947	+19.4%	¥1.8B ($11.8M)
2023-07-26	BUY	unknown	株式会社エスエスアール SSR Co., Ltd.	activist	2.0M	¥947	+19.4%	¥1.8B ($11.8M)
2023-07-26	SELL	unknown	武内寿憲 Toshinori Takeuchi	activist	80.0K	¥947	-19.4%	¥30M ($194K)
2023-07-26	SELL	unknown	武内寿憲 Toshinori Takeuchi	activist	80.0K	¥947	-19.4%	¥30M ($194K)
2023-06-30	BUY	unknown	株式会社エスエスアール SSR Co., Ltd.	activist	2.0M	¥1,295	-12.7%	¥2.6B ($17.0M)
2023-06-30	BUY	unknown	武内寿憲 Toshinori Takeuchi	activist	112.5K	¥1,295	-12.7%	¥146M ($940K)

Frequently asked questions

Who has been buying AR advanced technology, Inc. stock?: 2 distinct investors have filed 6 disclosed large-shareholding filings in AR advanced technology, Inc. (5578), most recently on 2025-12-18. 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 AR advanced technology, Inc. have?: AR advanced technology, Inc. has 6 buy-side and 10 sell-side disclosures on record, covering ¥7.9B ($50.6M) in total reported value, spanning 2023-06-30 to 2025-12-18.
Where does StockDrifts get AR advanced technology, 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 AR advanced technology, Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.