Who has been buying Nippon Ichi Software, Inc. stock?

6 distinct investors have filed 13 disclosed large-shareholding filings in Nippon Ichi Software, Inc. (3851), most recently on 2025-08-01. 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 Nippon Ichi Software, Inc. have?

Nippon Ichi Software, Inc. has 13 buy-side and 7 sell-side disclosures on record, covering ¥1.9B ($12.2M) in total reported value, spanning 2021-06-04 to 2025-08-01.

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.

Nippon Ichi Software, Inc. 3851

Company

株式会社日本一ソフトウェアNippon Ichi Software, Inc.

Investors

Buys

Total Value

¥1.9B ($12.2M)

Avg Return

-5.59%

Last Filing

2025-08-01

Nippon Ichi Software, Inc. (3851) has 13 disclosed large-shareholding filings and 7 disclosed disposals on record, filed by 6 distinct investors. Together those filings cover ¥1.9B ($12.2M) in reported transaction value. The earliest filing StockDrifts holds for Nippon Ichi Software, Inc. is dated 2021-06-04; the most recent is 2025-08-01. Across these filings the average return since disclosure is -5.59%, 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
2026-09-03	SELL	Market Buy	エスティーエムヘリテージピーティーイーエルティーディー (STM HERITAGE PTE. LTD.) STM HERITAGE PTE. LTD.	passive	217.7K	¥1,375	-2.1%	¥72M ($462K)
2026-08-27	SELL	Market Buy	エスティーエムヘリテージピーティーイーエルティーディー (STM HERITAGE PTE. LTD.) STM HERITAGE PTE. LTD.	passive	269.7K	¥1,297	-8.3%	¥83M ($534K)
2026-08-21	SELL	Market Buy	エスティーエムヘリテージピーティーイーエルティーディー (STM HERITAGE PTE. LTD.) STM HERITAGE PTE. LTD.	passive	333.7K	¥1,238	-13.4%	¥71M ($461K)
2025-08-01	SELL	Market Buy	エスティーエムヘリテージピーティーイーエルティーディー (STM HERITAGE PTE. LTD.) STM HERITAGE PTE. LTD.	passive	391.3K	¥863	-62.7%	¥1M ($9K)
2025-05-22	BUY	negotiated	北角浩一 Koichi Kitazumi	activist	10.0K	¥819	+71.4%	¥8M ($53K)
2025-05-22	BUY	negotiated	北角賀津子 Katsuko Kitakado	strategic	24.0K	¥819	+71.4%	¥20M ($127K)
2025-05-22	BUY	negotiated	有限会社ローゼンクイーン商会 Rosen Queen Shokai Co., Ltd.	activist	2.3M	¥819	+71.4%	¥82M ($528K)
2025-05-22	BUY	negotiated	有限会社ローゼンクイーン商会 Rosen Queen Shokai Co., Ltd.	activist	2.3M	¥819	+71.4%	¥1.9B ($12.4M)
2025-05-22	BUY	negotiated	北角浩一 Koichi Kitazumi	activist	10.0K	¥819	+71.4%	¥711M ($4.6M)
2025-05-22	BUY	negotiated	北角賀津子 Katsuko Kitakado	strategic	24.0K	¥819	-	-
2025-02-28	SELL	negotiated	北角浩一 Koichi Kitazumi	activist	190.0K	¥803	-74.8%	¥80M ($518K)
2025-02-28	SELL	negotiated	北角浩一 Koichi Kitazumi	activist	110.0K	¥803	-74.8%	¥64M ($414K)
2025-02-28	BUY	negotiated	有限会社ローゼンクイーン商会 Rosen Queen Shokai Co., Ltd.	activist	2.2M	¥803	+74.8%	¥64M ($414K)
2025-02-28	BUY	negotiated	北角賀津子 Katsuko Kitakado	strategic	24.0K	¥803	-	-
2025-02-28	BUY	negotiated	有限会社ローゼンクイーン商会 Rosen Queen Shokai Co., Ltd.	activist	2.2M	¥803	+74.8%	¥80M ($518K)
2025-02-28	BUY	negotiated	北角賀津子 Katsuko Kitakado	strategic	24.0K	¥803	-	-
2024-11-18	SELL	negotiated	北角浩一 Koichi Kitazumi	activist	289.9K	¥895	-56.9%	¥89M ($577K)
2024-11-18	BUY	negotiated	北角賀津子 Katsuko Kitakado	strategic	24.0K	¥895	-	-
2024-11-18	BUY	negotiated	有限会社ローゼンクイーン商会 Rosen Queen Shokai Co., Ltd.	activist	2.1M	¥895	+56.9%	¥89M ($577K)
2024-11-18	SELL	negotiated	北角浩一 Koichi Kitazumi	activist	289.9K	¥895	-56.9%	¥89M ($577K)
2024-11-18	BUY	negotiated	有限会社ローゼンクイーン商会 Rosen Queen Shokai Co., Ltd.	activist	2.1M	¥895	+56.9%	¥89M ($577K)
2024-11-18	BUY	negotiated	北角賀津子 Katsuko Kitakado	strategic	24.0K	¥895	-	-
2024-08-21	BUY	negotiated	北角賀津子 Katsuko Kitakado	strategic	24.0K	¥913	-	-
2024-08-21	SELL	negotiated	北角浩一 Koichi Kitazumi	activist	389.9K	¥913	-53.8%	¥86M ($552K)
2024-08-21	BUY	negotiated	有限会社ローゼンクイーン商会 Rosen Queen Shokai Co., Ltd.	activist	2.0M	¥913	+53.8%	¥78M ($504K)
2024-08-09	BUY	acquisition	エスティーエムヘリテージピーティーイーエルティーディー (STM HERITAGE PTE. LTD.) STM HERITAGE PTE. LTD.	passive	391.3K	¥901	+55.8%	¥353M ($2.3M)
2021-10-21	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	18.5K	¥1,412	-0.6%	¥22M ($144K)
2021-10-06	BUY	unknown	株式会社SBI証券 SBI SECURITIES Co.,Ltd.	other	262.8K	¥1,439	-2.4%	¥378M ($2.4M)
2021-06-04	SELL	unknown	大和証券株式会社 Daiwa Securities Co. Ltd.	other	0	¥1,210	-16.0%	¥414M ($2.7M)

Frequently asked questions

Who has been buying Nippon Ichi Software, Inc. stock?: 6 distinct investors have filed 13 disclosed large-shareholding filings in Nippon Ichi Software, Inc. (3851), most recently on 2025-08-01. 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 Nippon Ichi Software, Inc. have?: Nippon Ichi Software, Inc. has 13 buy-side and 7 sell-side disclosures on record, covering ¥1.9B ($12.2M) in total reported value, spanning 2021-06-04 to 2025-08-01.
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.