Who has been buying Internetworking and Broadband Consulting Co.,Ltd. stock?

5 distinct investors have filed 11 disclosed large-shareholding filings in Internetworking and Broadband Consulting Co.,Ltd. (3920), most recently on 2026-04-09. 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 Internetworking and Broadband Consulting Co.,Ltd. have?

Internetworking and Broadband Consulting Co.,Ltd. has 11 buy-side and 2 sell-side disclosures on record, covering ¥2.9B ($18.7M) in total reported value, spanning 2022-03-25 to 2026-04-09.

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.

Internetworking and Broadband Consulting Co.,Ltd. 3920

Company

アイビーシー株式会社Internetworking and Broadband Consulting Co.,Ltd.

Investors

Buys

Total Value

¥2.9B ($18.7M)

Avg Return

+8.02%

Last Filing

2026-04-09

Internetworking and Broadband Consulting Co.,Ltd. (3920) has 11 disclosed large-shareholding filings and 2 disclosed disposals on record, filed by 5 distinct investors. Together those filings cover ¥2.9B ($18.7M) in reported transaction value. The earliest filing StockDrifts holds for Internetworking and Broadband Consulting Co.,Ltd. is dated 2022-03-25; the most recent is 2026-04-09. Across these filings the average return since disclosure is +8.02%, 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
2026-08-26	BUY	Market Buy	株式会社UH5	passive	22.8K	¥979	-	-
2026-08-26	BUY	Market Buy	株式会社UH Partners 2	passive	293.0K	¥979	+1.1%	¥57M ($367K)
2026-08-26	BUY	Market Buy	光通信株式会社	passive	422.1K	¥979	-	-
2026-04-09	BUY	Market Buy	株式会社UH Partners 2	passive	234.9K	¥991	-0.1%	¥57M ($368K)
2026-04-09	BUY	Market Buy	株式会社UH5	passive	22.8K	¥991	-	-
2026-04-09	BUY	Market Buy	光通信株式会社	passive	422.1K	¥991	-	-
2026-03-06	BUY	Market Buy	光通信株式会社	passive	422.1K	¥983	-	-
2026-03-06	BUY	Market Buy	株式会社UH Partners 2	passive	177.1K	¥983	+0.7%	¥58M ($376K)
2026-03-06	BUY	Market Buy	株式会社UH5	passive	22.8K	¥983	-	-
2026-03-02	BUY	Market Buy	株式会社UH Partners 2	passive	117.9K	¥978	+1.2%	¥83M ($537K)
2026-03-02	BUY	Market Buy	株式会社UH5	passive	22.8K	¥978	-	-
2026-03-02	BUY	Market Buy	光通信株式会社	passive	422.1K	¥978	-	-
2025-12-18	BUY	Market Buy	光通信株式会社	passive	422.1K	¥916	+8.1%	¥23M ($150K)
2025-12-18	BUY	Market Buy	株式会社UH Partners 2	passive	32.5K	¥916	-	¥30M ($192K)
2025-12-18	BUY	Market Buy	株式会社UH5	passive	22.8K	¥916	-	-
2025-11-26	BUY	unknown	加藤裕之	other	2.1M	¥953	+3.9%	¥5M ($35K)
2025-11-26	SELL	unknown	プラスフジ株式会社	strategic	500.0K	¥953	-3.9%	¥2M ($14K)
2025-11-25	BUY	Market Buy	加藤裕之 HIROYUKI KATO	other	2.1M	¥957	+3.5%	¥6M ($36K)
2025-11-12	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	396.7K	¥1,001	-1.1%	¥41M ($267K)
2025-11-12	BUY	Market Buy	株式会社UH5 UH5 Co., Ltd.	passive	22.8K	¥1,001	-	¥23M ($147K)
2025-09-26	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	355.6K	¥985	+0.5%	¥3M ($18K)
2025-09-04	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	352.5K	¥1,004	-1.4%	¥58M ($376K)
2025-08-21	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	294.5K	¥1,057	-6.3%	¥311M ($2.0M)
2022-03-25	SELL	unknown	加藤裕之 HIROYUKI KATO	other	2.0M	¥619	-59.9%	¥7M ($43K)
2022-03-25	BUY	unknown	プラスフジ株式会社 Plus Fuji Co., Ltd.	strategic	500.0K	¥619	+59.9%	¥354K ($2K)

Frequently asked questions

Who has been buying Internetworking and Broadband Consulting Co.,Ltd. stock?: 5 distinct investors have filed 11 disclosed large-shareholding filings in Internetworking and Broadband Consulting Co.,Ltd. (3920), most recently on 2026-04-09. 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 Internetworking and Broadband Consulting Co.,Ltd. have?: Internetworking and Broadband Consulting Co.,Ltd. has 11 buy-side and 2 sell-side disclosures on record, covering ¥2.9B ($18.7M) in total reported value, spanning 2022-03-25 to 2026-04-09.
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.