Who has been buying Nippon Information Development Co., Ltd. stock?

8 distinct investors have filed 10 disclosed large-shareholding filings in Nippon Information Development Co., Ltd. (2349), most recently on 2025-09-26. 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 Information Development Co., Ltd. have?

Nippon Information Development Co., Ltd. has 10 buy-side and 4 sell-side disclosures on record, covering ¥3.5B ($22.7M) in total reported value, spanning 2021-05-28 to 2025-09-26.

Where does StockDrifts get Nippon Information Development 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.

Nippon Information Development Co., Ltd. 2349

Company

株式会社エヌアイデイNippon Information Development Co., Ltd.

Investors

Buys

Total Value

¥3.5B ($22.7M)

Avg Return

+32.00%

Last Filing

2025-09-26

Nippon Information Development Co., Ltd. (2349) has 10 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥3.5B ($22.7M) in reported transaction value. The earliest filing StockDrifts holds for Nippon Information Development Co., Ltd. is dated 2021-05-28; the most recent is 2025-09-26. 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 +32.00%, 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
2026-07-07	BUY	Market Buy	株式会社UH Partners 2	passive	813.9K	¥2,500	+1.2%	¥338M ($2.2M)
2026-07-07	BUY	Market Buy	光通信株式会社	passive	850.3K	¥2,500	+1.2%	¥2.1B ($13.7M)
2026-07-07	BUY	Market Buy	株式会社エスアイエル	passive	273.6K	¥2,500	+1.2%	¥684M ($4.4M)
2025-09-26	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	679.5K	¥2,327	-0.6%	¥192M ($1.2M)
2025-09-26	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	273.6K	¥2,327	-0.6%	¥637M ($4.1M)
2025-09-26	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	850.3K	¥2,327	-0.6%	¥2.0B ($12.8M)
2024-08-01	BUY	unknown	株式会社クリエートトニーワン Create Tony One Co., Ltd.	strategic	701.1K	¥2,540	-8.9%	¥1.8B ($11.5M)
2024-08-01	BUY	unknown	一般財団法人小森文化科学財団 Komori Foundation for Cultures and Sciences	other	800.0K	¥2,540	-8.9%	¥2.0B ($13.1M)
2024-08-01	SELL	unknown	小森孝一 Kouichi Komori	activist	1.2M	¥2,540	+8.9%	¥1.3B ($8.1M)
2024-04-19	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	850.3K	¥2,251	+2.8%	¥1.9B ($12.3M)
2024-04-19	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	273.6K	¥2,251	+2.8%	¥616M ($4.0M)
2024-04-19	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	596.1K	¥2,251	+2.8%	¥331M ($2.1M)
2023-01-26	BUY	Market Buy	小森俊太郎 Shuntarou Komori	activist	2.1M	¥1,798	+28.7%	¥434M ($2.8M)
2023-01-26	BUY	unknown	小森孝一 Kouichi Komori	activist	1.7M	¥1,798	+28.7%	¥3.0B ($19.4M)
2023-01-26	SELL	unknown	小森都子 Tsuko Komori	activist	0	¥1,798	-28.7%	¥328M ($2.1M)
2023-01-26	BUY	unknown	株式会社クリエートトニーワン Create Tony One Co., Ltd.	strategic	701.1K	¥1,798	+28.7%	¥1.3B ($8.1M)
2023-01-05	BUY	unknown	株式会社クリエートトニーワン Create Tony One Co., Ltd.	strategic	701.1K	¥1,670	+38.6%	¥1.2B ($7.6M)
2023-01-05	BUY	unknown	小森都子 Tsuko Komori	activist	181.6K	¥1,670	+38.6%	¥303M ($2.0M)
2023-01-05	BUY	Market Buy	株式会社クリエートトニーワン Create Tony One Co., Ltd.	unknown	701.1K	¥1,670	+38.6%	¥1.2B ($7.6M)
2023-01-05	BUY	unknown	小森孝一 Kouichi Komori	activist	1.7M	¥1,670	+38.6%	¥44M ($282K)
2023-01-05	BUY	Market Buy	小森孝一 Kouichi Komori	activist	1.7M	¥1,670	+38.6%	¥44M ($282K)
2022-08-22	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	273.6K	¥1,494	+54.9%	¥409M ($2.6M)
2022-08-22	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	449.4K	¥1,494	+54.9%	¥198M ($1.3M)
2022-08-22	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	850.3K	¥1,494	+54.9%	¥1.3B ($8.2M)
2022-01-18	BUY	Market Buy	株式会社エスアイエル SIL Co., Ltd.	passive	273.6K	¥1,453	+59.3%	¥398M ($2.6M)
2022-01-18	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	317.4K	¥1,453	+59.3%	¥34M ($221K)
2022-01-18	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	850.3K	¥1,453	-59.3%	¥396M ($2.6M)
2021-11-29	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	293.5K	¥1,538	+50.5%	¥10M ($65K)
2021-11-29	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.1M	¥1,538	+50.5%	¥1.7B ($11.2M)
2021-11-01	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	286.8K	¥1,481	+56.3%	¥194M ($1.3M)
2021-11-01	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.1M	¥1,481	+56.3%	¥1.7B ($10.7M)
2021-05-28	SELL	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	155.5K	¥1,444	-60.3%	¥1.1B ($7.1M)
2021-05-28	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.1M	¥1,444	+60.3%	¥1.6B ($10.5M)

Frequently asked questions

Who has been buying Nippon Information Development Co., Ltd. stock?: 8 distinct investors have filed 10 disclosed large-shareholding filings in Nippon Information Development Co., Ltd. (2349), most recently on 2025-09-26. 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 Information Development Co., Ltd. have?: Nippon Information Development Co., Ltd. has 10 buy-side and 4 sell-side disclosures on record, covering ¥3.5B ($22.7M) in total reported value, spanning 2021-05-28 to 2025-09-26.
Where does StockDrifts get Nippon Information Development 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 Nippon Information Development Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.