Who has been buying Ateam Inc. stock?

3 distinct investors have filed 10 disclosed large-shareholding filings in Ateam Inc. (3662), most recently on 2025-09-02. 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 Ateam Inc. have?

Ateam Inc. has 10 buy-side and 1 sell-side disclosures on record, covering ¥1.8B ($11.4M) in total reported value, spanning 2021-12-09 to 2025-09-02.

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.

Ateam Inc. 3662

Company

株式会社エイチームホールディングスAteam Inc.

Investors

Buys

Total Value

¥1.8B ($11.4M)

Avg Return

-10.66%

Last Filing

2025-09-02

Ateam Inc. (3662) has 10 disclosed large-shareholding filings and 1 disclosed disposals on record, filed by 3 distinct investors. Together those filings cover ¥1.8B ($11.4M) in reported transaction value. The earliest filing StockDrifts holds for Ateam Inc. is dated 2021-12-09; the most recent is 2025-09-02. Across these filings the average return since disclosure is -10.66%, 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
2026-09-16	BUY	Market Buy	エーピーアイピーインク (APIP, Inc.) APIP, Inc.	passive	5.1M	¥940	-0.6%	¥308M ($2.0M)
2026-06-09	BUY	Market Buy	林高生	activist	706.0K	¥912	+2.4%	¥31M ($199K)
2026-06-09	BUY	unknown	株式会社林家族	activist	5.6M	¥912	-	-
2025-09-02	BUY	Market Buy	林高生 Takao Hayashi	activist	706.0K	¥1,259	-25.8%	¥43M ($275K)
2025-09-02	BUY	unknown	林高生 Takao Hayashi	activist	706.0K	¥1,259	-25.8%	¥43M ($275K)
2025-09-02	BUY	unknown	株式会社林家族 Hayashi Kazoku Co., Ltd.	activist	5.6M	¥1,259	-25.8%	¥348M ($2.2M)
2025-09-02	BUY	Market Buy	株式会社林家族 Hayashi Kazoku Co., Ltd.	activist	5.6M	¥1,259	-25.8%	¥348M ($2.2M)
2025-08-04	BUY	Market Buy	林高生 Takao Hayashi	activist	706.0K	¥1,188	-21.4%	¥40M ($260K)
2025-08-04	BUY	unknown	株式会社林家族 Hayashi Kazoku Co., Ltd.	activist	5.6M	¥1,188	-21.4%	¥329M ($2.1M)
2025-08-04	BUY	Market Buy	株式会社林家族 Hayashi Kazoku Co., Ltd.	activist	5.6M	¥1,188	-21.4%	¥329M ($2.1M)
2025-08-04	BUY	unknown	林高生 Takao Hayashi	activist	706.0K	¥1,188	-21.4%	¥40M ($260K)
2025-06-23	SELL	Market Buy	エーピーアイピーインク (APIP, Inc.) APIP, Inc.	passive	5.1M	¥1,157	+19.3%	¥2.5B ($16.2M)
2025-06-20	BUY	Market Buy	エーピーアイピーインク (APIP, Inc.) APIP, Inc.	passive	7.8M	¥1,170	-20.2%	¥715M ($4.6M)
2024-07-03	BUY	Market Buy	エーピーアイピー・インク (APIP, Inc.) APIP, Inc.	passive	7.8M	¥754	+23.9%	¥5.9B ($37.8M)
2022-07-05	BUY	unknown	林高生 Takao Hayashi	activist	706.0K	¥711	-	-
2022-07-05	BUY	unknown	株式会社林家族 Hayashi Kazoku Co., Ltd.	activist	5.6M	¥711	-	-
2022-05-31	BUY	unknown	林高生 Takao Hayashi	activist	706.0K	¥731	-	-
2022-05-31	BUY	unknown	株式会社林家族 Hayashi Kazoku Co., Ltd.	activist	5.6M	¥731	-	-
2022-03-28	BUY	unknown	林高生 Takao Hayashi	activist	706.0K	¥746	-	-
2022-03-28	BUY	unknown	株式会社林家族 Hayashi Kazoku Co., Ltd.	activist	5.6M	¥746	-	-
2022-02-02	BUY	unknown	林高生 Takao Hayashi	activist	706.0K	¥750	-	-
2022-02-02	BUY	unknown	林高生 Takao Hayashi	activist	706.0K	¥750	-	-
2022-02-02	BUY	unknown	株式会社林家族 Hayashi Kazoku Co., Ltd.	activist	5.6M	¥750	-	-
2022-02-02	BUY	unknown	株式会社林家族 Hayashi Kazoku Co., Ltd.	activist	5.6M	¥750	-	-
2022-01-06	BUY	unknown	林高生 Takao Hayashi	activist	706.0K	¥814	-	-
2022-01-06	BUY	unknown	株式会社林家族 Hayashi Kazoku Co., Ltd.	activist	5.6M	¥814	-	-
2021-12-09	BUY	unknown	林高生 Takao Hayashi	activist	706.0K	¥1,055	-	-
2021-12-09	BUY	unknown	林高生 Takao Hayashi	activist	706.0K	¥1,055	-	-
2021-12-09	BUY	unknown	株式会社林家族 Hayashi Kazoku Co., Ltd.	activist	5.6M	¥1,055	-	-
2021-12-09	BUY	unknown	株式会社林家族 Hayashi Kazoku Co., Ltd.	activist	5.6M	¥1,055	-	-

Frequently asked questions

Who has been buying Ateam Inc. stock?: 3 distinct investors have filed 10 disclosed large-shareholding filings in Ateam Inc. (3662), most recently on 2025-09-02. 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 Ateam Inc. have?: Ateam Inc. has 10 buy-side and 1 sell-side disclosures on record, covering ¥1.8B ($11.4M) in total reported value, spanning 2021-12-09 to 2025-09-02.
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.

More on this data

Every trade listed above comes from an official regulatory disclosure. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.