Who has been buying AI,Inc. stock?

4 distinct investors have filed 2 disclosed large-shareholding filings in AI,Inc. (4388), most recently on 2025-06-19. 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 AI,Inc. have?

AI,Inc. has 2 buy-side and 14 sell-side disclosures on record, covering ¥526M ($3.4M) in total reported value, spanning 2023-03-14 to 2025-06-19.

Where does StockDrifts get AI,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.

AI,Inc. 4388

Company

株式会社エーアイAI,Inc.

Investors

Buys

Total Value

¥526M ($3.4M)

Avg Return

-18.91%

Last Filing

2025-06-19

AI,Inc. (4388) has 2 disclosed large-shareholding filings and 14 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥526M ($3.4M) in reported transaction value. The earliest filing StockDrifts holds for AI,Inc. is dated 2023-03-14; the most recent is 2025-06-19. 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 -18.91%, 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
2025-06-19	SELL	Market Buy	吉田大介 Daisuke Yoshida	passive	334.4K	¥472	+14.6%	¥35M ($226K)
2025-06-19	BUY	Market Buy	吉田大介 Daisuke Yoshida	passive	334.4K	¥472	-14.6%	¥35M ($224K)
2025-06-19	BUY	Market Buy	吉田大介 Daisuke Yoshida	passive	334.4K	¥472	-14.6%	¥35M ($224K)
2025-05-15	SELL	unknown	合同会社吉田事務所 Yoshida LLC LLC	passive	178.2K	¥425	+5.2%	¥33M ($211K)
2025-05-15	BUY	unknown	吉田大志 Taishi Yoshida	strategic	150.0K	¥425	-5.2%	¥64M ($411K)
2025-05-07	SELL	unknown	合同会社吉田事務所 Yoshida LLC LLC	passive	255.0K	¥464	+13.2%	¥36M ($231K)
2025-05-07	BUY	unknown	吉田大志 Taishi Yoshida	strategic	150.0K	¥464	-13.2%	¥70M ($449K)
2025-04-22	SELL	unknown	合同会社吉田事務所 Yoshida LLC LLC	passive	331.8K	¥466	+13.5%	¥36M ($230K)
2025-04-22	BUY	unknown	吉田大志 Taishi Yoshida	strategic	150.0K	¥466	-13.5%	¥70M ($451K)
2025-04-10	SELL	unknown	合同会社吉田事務所 Yoshida LLC LLC	passive	408.6K	¥436	+7.6%	¥34M ($217K)
2025-04-10	SELL	unknown	合同会社吉田事務所 Yoshida LLC LLC	passive	408.6K	¥436	+7.6%	¥34M ($217K)
2025-04-10	BUY	unknown	吉田大志 Taishi Yoshida	strategic	150.0K	¥436	-7.6%	¥65M ($422K)
2025-04-10	BUY	unknown	吉田大志 Taishi Yoshida	strategic	150.0K	¥436	-7.6%	¥65M ($422K)
2025-04-03	BUY	Market Buy	吉田大介 Daisuke Yoshida	passive	505.3K	¥476	-15.3%	¥35M ($224K)
2025-04-03	BUY	Market Buy	吉田大介 Daisuke Yoshida	passive	408.9K	¥476	-15.3%	¥42M ($271K)
2025-04-03	SELL	Market Buy	吉田大介 Daisuke Yoshida	passive	434.4K	¥476	+15.3%	¥30M ($194K)
2025-04-03	BUY	Market Buy	吉田大介 Daisuke Yoshida	passive	407.8K	¥476	-15.3%	¥42M ($273K)
2025-04-01	SELL	unknown	合同会社吉田事務所 Yoshida LLC LLC	passive	485.4K	¥493	+18.3%	¥38M ($245K)
2025-04-01	BUY	unknown	吉田大志 Taishi Yoshida	strategic	150.0K	¥493	-18.3%	¥74M ($477K)
2025-03-19	BUY	unknown	合同会社吉田事務所 Yoshida LLC LLC	passive	511.0K	¥497	-18.9%	¥250M ($1.6M)
2025-03-19	BUY	unknown	合同会社吉田事務所 Yoshida LLC LLC	passive	562.2K	¥497	-18.9%	¥276M ($1.8M)
2025-03-19	SELL	unknown	吉田大志 Taishi Yoshida	strategic	150.0K	¥497	+18.9%	¥28M ($177K)
2025-03-19	SELL	unknown	吉田大志 Taishi Yoshida	strategic	150.0K	¥497	+18.9%	¥28M ($177K)
2025-01-14	SELL	Market Buy	吉田大介 Daisuke Yoshida	passive	505.3K	¥505	+20.2%	¥37M ($237K)
2025-01-14	BUY	Market Buy	吉田大介 Daisuke Yoshida	passive	505.3K	¥505	-20.2%	¥37M ($237K)
2025-01-14	BUY	Market Buy	吉田大介 Daisuke Yoshida	passive	496.8K	¥505	-20.2%	¥37M ($237K)
2024-10-03	SELL	unknown	吉田大介 Daisuke Yoshida	strategic	586.3K	¥616	+34.6%	¥34M ($222K)
2024-10-03	BUY	Market Buy	吉田大介 Daisuke Yoshida	passive	586.3K	¥616	-34.6%	¥34M ($222K)
2024-10-03	SELL	Market Buy	吉田大介 Daisuke Yoshida	passive	578.1K	¥616	+34.6%	¥133M ($860K)
2024-10-03	BUY	Market Buy	吉田大介 Daisuke Yoshida	passive	586.3K	¥616	-34.6%	¥3M ($16K)
2024-10-03	BUY	Market Buy	吉田大介 Daisuke Yoshida	passive	578.1K	¥616	-34.6%	¥137M ($882K)
2024-10-03	BUY	Market Buy	吉田大介 Daisuke Yoshida	passive	590.0K	¥616	-34.6%	¥32M ($205K)
2024-10-03	BUY	Market Buy	吉田大介 Daisuke Yoshida	passive	569.1K	¥616	-34.6%	¥142M ($916K)
2023-05-19	BUY	unknown	吉田大介 Daisuke Yoshida	strategic	642.0K	¥912	-55.8%	¥22M ($143K)
2023-05-19	BUY	unknown	吉田大介 Daisuke Yoshida	strategic	642.0K	¥912	-55.8%	¥22M ($143K)
2023-05-19	BUY	unknown	吉田大介 Daisuke Yoshida	strategic	642.0K	¥912	-55.8%	¥22M ($143K)
2023-05-19	BUY	unknown	吉田大介 Daisuke Yoshida	strategic	642.0K	¥912	-55.8%	¥586M ($3.8M)
2023-03-14	SELL	unknown	廣飯伸一 SHINICHI HIROI	activist	880.0K	¥1,179	+65.8%	¥70M ($452K)

Frequently asked questions

Who has been buying AI,Inc. stock?: 4 distinct investors have filed 2 disclosed large-shareholding filings in AI,Inc. (4388), most recently on 2025-06-19. 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 AI,Inc. have?: AI,Inc. has 2 buy-side and 14 sell-side disclosures on record, covering ¥526M ($3.4M) in total reported value, spanning 2023-03-14 to 2025-06-19.
Where does StockDrifts get AI,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 AI,Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.