Who has been buying Nagano Keiki Co., Ltd. stock?

8 distinct investors have filed 8 disclosed large-shareholding filings in Nagano Keiki Co., Ltd. (7715), most recently on 2026-01-22. 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 Nagano Keiki Co., Ltd. have?

Nagano Keiki Co., Ltd. has 8 buy-side and 5 sell-side disclosures on record, covering ¥7.3B ($47.0M) in total reported value, spanning 2021-05-31 to 2026-01-22.

Where does StockDrifts get Nagano Keiki Co., Ltd. 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.

Nagano Keiki Co., Ltd. 7715

Company

長野計器株式会社Nagano Keiki Co., Ltd.

Investors

Buys

Total Value

¥7.3B ($47.0M)

Avg Return

+27.76%

Last Filing

2026-01-22

Nagano Keiki Co., Ltd. (7715) has 8 disclosed large-shareholding filings and 5 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥7.3B ($47.0M) in reported transaction value. The earliest filing StockDrifts holds for Nagano Keiki Co., Ltd. is dated 2021-05-31; the most recent is 2026-01-22. 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 +27.76%, 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
2026-08-07	BUY	unknown	アセットマネジメントOne株式会社	other	747.5K	¥3,930	+12.5%	¥2.9B ($19.0M)
2026-08-07	BUY	negotiated	みずほ証券株式会社	strategic	215.9K	¥3,930	+12.5%	¥849M ($5.5M)
2026-06-22	SELL	unknown	野村アセットマネジメント株式会社	other	1.3M	¥4,690	+21.3%	¥585M ($3.8M)
2026-06-22	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	15.6K	¥4,690	+21.3%	¥35M ($229K)
2026-06-22	SELL	unknown	野村證券株式会社	other	27.3K	¥4,690	+21.3%	¥204M ($1.3M)
2026-01-22	BUY	Market Buy	野村アセットマネジメント株式会社	other	1.4M	¥2,710	+12.7%	¥4.4B ($28.6M)
2026-01-22	SELL	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	24.2K	¥2,710	-12.7%	¥74M ($478K)
2026-01-22	SELL	Market Buy	野村證券株式会社	other	72.2K	¥2,710	-12.7%	¥221M ($1.4M)
2025-11-07	BUY	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.2M	¥2,270	+34.6%	¥534M ($3.4M)
2025-11-07	BUY	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	73.9K	¥2,270	+34.6%	¥168M ($1.1M)
2025-11-07	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	73.9K	¥2,270	+34.6%	¥4M ($28K)
2025-10-22	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	987.2K	¥2,315	+32.0%	¥2.3B ($14.7M)
2025-10-22	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	74.5K	¥2,315	+32.0%	¥172M ($1.1M)
2025-10-22	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	71.9K	¥2,315	+32.0%	¥166M ($1.1M)
2025-09-08	SELL	negotiated	エア・ウォーター株式会社 AIR WATER INC.	strategic	0	¥2,095	-45.8%	¥2.9B ($18.9M)
2025-05-08	SELL	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	732.5K	¥1,895	-61.2%	¥464M ($3.0M)
2025-02-06	BUY	Market Buy	三井住友DSアセットマネジメント株式会社 Sumitomo Mitsui DS Asset Management Company, Limited	passive	978.1K	¥2,164	+41.2%	¥2.1B ($13.7M)
2024-05-22	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	199.6K	¥2,963	-3.1%	¥639M ($4.1M)
2024-05-22	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	strategic	225.6K	¥2,963	+3.1%	¥35M ($223K)
2024-05-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	363.4K	¥2,963	+3.1%	¥1.1B ($6.9M)
2021-05-31	BUY	negotiated	エア・ウォーター株式会社 AIR WATER INC.	strategic	1.4M	¥1,197	+155.2%	¥1.7B ($10.8M)
2021-05-31	BUY	negotiated	エア・ウォーター株式会社 AIR WATER INC.	strategic	1.4M	¥1,197	+155.2%	¥93M ($600K)

Frequently asked questions

Who has been buying Nagano Keiki Co., Ltd. stock?: 8 distinct investors have filed 8 disclosed large-shareholding filings in Nagano Keiki Co., Ltd. (7715), most recently on 2026-01-22. 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 Nagano Keiki Co., Ltd. have?: Nagano Keiki Co., Ltd. has 8 buy-side and 5 sell-side disclosures on record, covering ¥7.3B ($47.0M) in total reported value, spanning 2021-05-31 to 2026-01-22.
Where does StockDrifts get Nagano Keiki Co., Ltd. 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 Nagano Keiki Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.