Who has been buying Nihon Knowledge Co,Ltd. stock?

5 distinct investors have filed 15 disclosed large-shareholding filings in Nihon Knowledge Co,Ltd. (5252), most recently on 2025-10-31. 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 Nihon Knowledge Co,Ltd. have?

Nihon Knowledge Co,Ltd. has 15 buy-side and 1 sell-side disclosures on record, covering ¥2.0B ($13.0M) in total reported value, spanning 2023-03-24 to 2025-10-31.

Where does StockDrifts get Nihon Knowledge 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.

Nihon Knowledge Co,Ltd. 5252

Company

日本ナレッジ株式会社Nihon Knowledge Co,Ltd.

Investors

Buys

Total Value

¥2.0B ($13.0M)

Avg Return

+37.74%

Last Filing

2025-10-31

Nihon Knowledge Co,Ltd. (5252) has 15 disclosed large-shareholding filings and 1 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥2.0B ($13.0M) in reported transaction value. The earliest filing StockDrifts holds for Nihon Knowledge Co,Ltd. is dated 2023-03-24; the most recent is 2025-10-31. 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 +37.74%, 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
2025-10-31	BUY	unknown	ウィステリアトラスト株式会社 Wisteria Trust Co., Ltd.	activist	595.8K	¥494	+57.3%	¥294M ($1.9M)
2025-10-31	BUY	unknown	藤井洋一 Youichi Fujii	activist	25.0K	¥494	+57.3%	¥12M ($80K)
2025-09-29	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	74.2K	¥495	+57.0%	¥4M ($27K)
2025-09-29	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	105.5K	¥495	-57.0%	¥342K ($2K)
2025-07-22	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	65.4K	¥421	+84.6%	¥6M ($38K)
2025-07-22	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	105.5K	¥421	+84.6%	¥44M ($287K)
2025-05-12	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	51.5K	¥423.33	+83.5%	¥7M ($46K)
2025-05-12	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	105.5K	¥423.33	+83.5%	¥45M ($288K)
2025-04-23	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	34.7K	¥433.33	+79.3%	¥10M ($67K)
2025-04-23	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	105.5K	¥433.33	+79.3%	¥46M ($295K)
2025-04-21	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	10.6K	¥440.33	+76.5%	¥5M ($30K)
2025-04-21	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	105.5K	¥440.33	+76.5%	¥3M ($16K)
2025-04-15	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	99.8K	¥403	+92.8%	¥7M ($43K)
2025-04-03	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	83.3K	¥327.67	+137.1%	¥5M ($30K)
2025-01-10	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	69.2K	¥330	+135.4%	¥23M ($147K)
2023-03-31	BUY	unknown	藤井洋一 Youichi Fujii	activist	25.0K	¥900	-13.7%	¥23M ($145K)
2023-03-31	BUY	unknown	ウィステリアトラスト株式会社 Wisteria Trust Co., Ltd.	activist	595.8K	¥900	-13.7%	¥530M ($3.4M)
2023-03-31	BUY	unknown	ウィステリアトラスト株式会社 Wisteria Trust Co., Ltd.	activist	595.8K	¥900	-13.7%	¥530M ($3.4M)
2023-03-31	BUY	unknown	藤井洋一 Youichi Fujii	activist	25.0K	¥900	-13.7%	¥23M ($145K)
2023-03-27	BUY	negotiated	株式会社大塚商会 OTSUKA CORPORATION	strategic	134.0K	¥952	-18.4%	¥128M ($823K)
2023-03-24	BUY	unknown	ウィステリアトラスト株式会社 Wisteria Trust Co., Ltd.	activist	652.0K	¥1,170	-33.6%	¥763M ($4.9M)
2023-03-24	BUY	unknown	藤井洋一 Youichi Fujii	activist	25.0K	¥1,170	-33.6%	¥29M ($189K)
2023-03-24	BUY	unknown	ウィステリアトラスト株式会社 Wisteria Trust Co., Ltd.	activist	652.0K	¥1,170	-33.6%	¥763M ($4.9M)
2023-03-24	BUY	unknown	藤井洋一 Youichi Fujii	activist	25.0K	¥1,170	-33.6%	¥29M ($189K)

Frequently asked questions

Who has been buying Nihon Knowledge Co,Ltd. stock?: 5 distinct investors have filed 15 disclosed large-shareholding filings in Nihon Knowledge Co,Ltd. (5252), most recently on 2025-10-31. 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 Nihon Knowledge Co,Ltd. have?: Nihon Knowledge Co,Ltd. has 15 buy-side and 1 sell-side disclosures on record, covering ¥2.0B ($13.0M) in total reported value, spanning 2023-03-24 to 2025-10-31.
Where does StockDrifts get Nihon Knowledge 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 Nihon Knowledge Co,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.