Who has been buying NEOJAPAN Inc. stock?

4 distinct investors have filed 6 disclosed large-shareholding filings in NEOJAPAN Inc. (3921), most recently on 2026-05-11. 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 NEOJAPAN Inc. have?

NEOJAPAN Inc. has 6 buy-side and 5 sell-side disclosures on record, covering ¥3.9B ($25.0M) in total reported value, spanning 2022-04-18 to 2026-05-11.

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.

NEOJAPAN Inc. 3921

Company

株式会社ネオジャパンNEOJAPAN Inc.

Investors

Buys

Total Value

¥3.9B ($25.0M)

Avg Return

+15.73%

Last Filing

2026-05-11

NEOJAPAN Inc. (3921) has 6 disclosed large-shareholding filings and 5 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥3.9B ($25.0M) in reported transaction value. The earliest filing StockDrifts holds for NEOJAPAN Inc. is dated 2022-04-18; the most recent is 2026-05-11. Across these filings the average return since disclosure is +15.73%, 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
2026-05-11	BUY	Market Buy	株式会社プロシードゥス	strategic	5.2M	¥1,601	+5.4%	¥462M ($3.0M)
2026-05-11	BUY	Market Buy	齊藤章浩	activist	1.2M	¥1,601	+5.4%	¥70M ($451K)
2026-05-01	BUY	Market Buy	カナメ・キャピタル・エルピー(Kaname Capital,L.P.) Kaname Capital, L.P.	activist	714.2K	¥1,553	+8.6%	¥1.1B ($7.2M)
2026-04-30	BUY	Market Buy	カナメ・キャピタル・エルピー(Kaname Capital,L.P.) Kaname Capital, L.P.	activist	704.0K	¥1,539	-	¥1.1B ($7.0M)
2026-04-30	BUY	Market Buy	カナメ・キャピタル・エルピー(Kaname Capital,L.P.) Kaname Capital, L.P.	activist	704.0K	¥1,539	+9.6%	¥1.1B ($7.0M)
2024-03-18	BUY	unknown	大坪克也 Katsuya Otsubo	strategic	1.4M	¥1,249	-	-
2024-03-14	SELL	unknown	大坪克也 Katsuya Otsubo	strategic	1.4M	¥1,249	-35.1%	¥1.1B ($6.9M)
2023-12-21	BUY	unknown	齊藤章浩 Akihiro Saito	activist	1.3M	¥1,001	-	¥2.3B ($14.9M)
2023-12-21	SELL	unknown	齊藤章浩 Akihiro Saito	activist	1.3M	¥1,001	-68.5%	¥2.3B ($14.9M)
2023-12-21	BUY	Market Buy	株式会社プロシードゥス prosidus Inc.	strategic	5.2M	¥1,001	+68.5%	¥2.3B ($14.9M)
2023-03-20	SELL	unknown	大坪克也 Katsuya Otsubo	strategic	2.2M	¥841	-100.6%	¥8M ($49K)
2023-03-13	BUY	unknown	株式会社プロシードゥス prosidus Inc.	strategic	2.9M	¥939	-	¥1M ($9K)
2023-03-13	SELL	unknown	株式会社プロシードゥス prosidus Inc.	strategic	2.9M	¥939	-79.7%	¥1M ($9K)
2022-04-18	BUY	unknown	株式会社プロシードゥス prosidus Inc.	strategic	2.9M	¥1,132	-	¥2.2B ($14.4M)
2022-04-18	BUY	unknown	齊藤章浩 Akihiro Saito	activist	3.6M	¥1,132	-	¥2.5B ($16.3M)
2022-04-18	SELL	unknown	齊藤章浩 Akihiro Saito	activist	3.6M	¥1,132	-49.0%	¥2.5B ($16.3M)
2022-04-18	BUY	Market Buy	株式会社プロシードゥス prosidus Inc.	strategic	2.9M	¥1,132	+49.0%	¥2.2B ($14.5M)

Frequently asked questions

Who has been buying NEOJAPAN Inc. stock?: 4 distinct investors have filed 6 disclosed large-shareholding filings in NEOJAPAN Inc. (3921), most recently on 2026-05-11. 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 NEOJAPAN Inc. have?: NEOJAPAN Inc. has 6 buy-side and 5 sell-side disclosures on record, covering ¥3.9B ($25.0M) in total reported value, spanning 2022-04-18 to 2026-05-11.
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.