Who has been buying NPR-Riken Corporation stock?

15 distinct investors have filed 26 disclosed large-shareholding filings in NPR-Riken Corporation (6209), most recently on 2026-05-08. 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 NPR-Riken Corporation have?

NPR-Riken Corporation has 26 buy-side and 10 sell-side disclosures on record, covering ¥13.9B ($89.5M) in total reported value, spanning 2023-10-19 to 2026-05-08.

Where does StockDrifts get NPR-Riken Corporation 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.

NPR-Riken Corporation 6209

Company

リケンNPR株式会社NPR-Riken Corporation

Investors

Buys

Total Value

¥13.9B ($89.5M)

Avg Return

+69.71%

Last Filing

2026-05-08

NPR-Riken Corporation (6209) has 26 disclosed large-shareholding filings and 10 disclosed disposals on record, filed by 15 distinct investors. Together those filings cover ¥13.9B ($89.5M) in reported transaction value. The earliest filing StockDrifts holds for NPR-Riken Corporation is dated 2023-10-19; the most recent is 2026-05-08. 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 +69.71%, 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
2026-05-08	SELL	unknown	三菱UFJモルガン・スタンレー証券株式会社	other	2.5K	¥3,930	-1.8%	¥144M ($931K)
2026-05-08	SELL	Market Buy	三菱UFJアセットマネジメント株式会社	passive	167.5K	¥3,930	-1.8%	¥344M ($2.2M)
2026-05-08	SELL	Market Buy	三菱UFJ信託銀行株式会社	passive	734.2K	¥3,930	-1.8%	¥755M ($4.9M)
2026-05-08	BUY	negotiated	株式会社三菱UFJ銀行	strategic	510.7K	¥3,930	+1.8%	¥2.0B ($12.9M)
2025-09-19	SELL	negotiated	アモーヴァ・アセットマネジメント株式会社 Amova Asset Management Co., Ltd.	other	424.3K	¥3,120	-28.7%	¥203M ($1.3M)
2025-09-19	SELL	negotiated	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	524.2K	¥3,120	-28.7%	¥18M ($114K)
2025-09-19	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	523.4K	¥3,120	+28.7%	¥1.6B ($10.5M)
2025-04-04	BUY	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	489.8K	¥2,168	+85.2%	¥6M ($40K)
2025-04-04	BUY	Market Buy	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	529.9K	¥2,168	+85.2%	¥6M ($40K)
2025-04-04	BUY	Market Buy	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	523.4K	¥2,168	+85.2%	¥1.1B ($7.3M)
2025-03-31	BUY	Market Buy	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	510.7K	¥2,493	+61.0%	¥1.3B ($8.2M)
2025-03-31	SELL	Market Buy	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	40.8K	¥2,493	-61.0%	¥99M ($636K)
2025-03-31	BUY	Market Buy	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	253.4K	¥2,493	+61.0%	¥352M ($2.3M)
2025-03-31	BUY	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	927.7K	¥2,493	+61.0%	¥479M ($3.1M)
2025-01-21	BUY	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	485.2K	¥2,475	+62.2%	¥133M ($857K)
2025-01-21	BUY	Market Buy	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	528.7K	¥2,475	+62.2%	¥84M ($541K)
2025-01-21	SELL	Market Buy	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	523.4K	¥2,475	-62.2%	¥7M ($45K)
2024-11-20	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	482.1K	¥2,422	-65.8%	¥294M ($1.9M)
2024-11-20	BUY	unknown	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	other	26.0K	¥2,422	+65.8%	¥62M ($397K)
2024-11-20	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	-14.5K	¥2,422	-65.8%	¥34M ($221K)
2024-11-20	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	860.8K	¥2,422	+65.8%	¥21M ($132K)
2024-11-18	BUY	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	79.7K	¥2,466	+62.8%	¥196M ($1.3M)
2024-11-18	BUY	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	113.0K	¥2,466	+62.8%	¥279M ($1.8M)
2024-11-18	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	733.2K	¥2,466	+62.8%	¥1.8B ($11.7M)
2024-11-18	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	510.7K	¥2,466	+62.8%	¥1.3B ($8.1M)
2024-08-20	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	605.2K	¥2,417	+66.1%	¥1.5B ($9.4M)
2024-08-20	BUY	unknown	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	other	0	¥2,417	+66.1%	-
2024-08-20	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	-664	¥2,417	+66.1%	-
2024-08-20	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	854.3K	¥2,417	+66.1%	¥2.1B ($13.3M)
2024-07-05	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	456.6K	¥2,805	+43.1%	¥1.3B ($8.3M)
2024-07-05	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	972.7K	¥2,805	+43.1%	¥2.7B ($17.6M)
2024-05-23	BUY	unknown	村上貴輝 Takateru Murakami	activist	1.3M	¥2,814	+42.7%	¥3.6B ($23.1M)
2024-05-23	SELL	unknown	株式会社MI2 MI2 Ltd.	activist	53.5K	¥2,814	-42.7%	¥618M ($4.0M)
2024-02-01	BUY	unknown	株式会社MI2 MI2 Ltd.	activist	273.5K	¥2,750	+46.0%	¥752M ($4.9M)
2024-02-01	BUY	unknown	村上貴輝 Takateru Murakami	activist	1.7M	¥2,750	+46.0%	¥787M ($5.1M)
2024-01-12	BUY	unknown	村上貴輝 Takateru Murakami	activist	1.4M	¥2,566	+56.5%	¥756M ($4.9M)
2024-01-12	BUY	unknown	株式会社MI2 MI2 Ltd.	activist	273.5K	¥2,566	+56.5%	¥702M ($4.5M)
2024-01-05	BUY	unknown	村上貴輝 Takateru Murakami	activist	1.1M	¥2,358	+70.3%	¥2.7B ($17.4M)
2024-01-05	BUY	unknown	株式会社MI2 MI2 Ltd.	activist	273.5K	¥2,358	+70.3%	¥645M ($4.2M)
2023-10-19	BUY	negotiated	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	491.8K	¥1,781	+125.4%	¥876M ($5.7M)
2023-10-19	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	428.5K	¥1,781	+125.4%	¥763M ($4.9M)
2023-10-19	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	523.4K	¥1,781	+125.4%	¥932M ($6.0M)

Frequently asked questions

Who has been buying NPR-Riken Corporation stock?: 15 distinct investors have filed 26 disclosed large-shareholding filings in NPR-Riken Corporation (6209), most recently on 2026-05-08. 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 NPR-Riken Corporation have?: NPR-Riken Corporation has 26 buy-side and 10 sell-side disclosures on record, covering ¥13.9B ($89.5M) in total reported value, spanning 2023-10-19 to 2026-05-08.
Where does StockDrifts get NPR-Riken Corporation 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 NPR-Riken Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.