Who has been buying BroadBand Tower, Inc. stock?

4 distinct investors have filed 10 disclosed large-shareholding filings in BroadBand Tower, Inc. (3776), most recently on 2026-05-14. 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 BroadBand Tower, Inc. have?

BroadBand Tower, Inc. has 10 buy-side and 5 sell-side disclosures on record, covering ¥2.0B ($13.0M) in total reported value, spanning 2021-05-17 to 2026-05-14.

Where does StockDrifts get BroadBand Tower, Inc. 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.

BroadBand Tower, Inc. 3776

Company

株式会社ブロードバンドタワーBroadBand Tower, Inc.

Investors

Buys

Total Value

¥2.0B ($13.0M)

Avg Return

+3.36%

Last Filing

2026-05-14

BroadBand Tower, Inc. (3776) has 10 disclosed large-shareholding filings and 5 disclosed disposals on record, filed by 4 distinct investors. Together those filings cover ¥2.0B ($13.0M) in reported transaction value. The earliest filing StockDrifts holds for BroadBand Tower, Inc. is dated 2021-05-17; the most recent is 2026-05-14. 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 +3.36%, 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
2026-07-31	BUY	Market Buy	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	activist	16.6M	¥230	+8.7%	¥185M ($1.2M)
2026-07-10	BUY	Market Buy	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	other	15.8M	¥290	-13.1%	¥242M ($1.6M)
2026-06-30	BUY	Market Buy	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	other	15.0M	¥285	-16.5%	¥256M ($1.7M)
2026-06-24	BUY	Market Buy	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	other	14.1M	¥275	+2.5%	¥264M ($1.7M)
2026-06-11	BUY	Market Buy	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	other	13.1M	¥276	+6.5%	¥171M ($1.1M)
2026-05-14	BUY	Market Buy	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	other	12.4M	¥254	+3.5%	¥235M ($1.5M)
2026-05-11	BUY	Market Buy	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	activist	11.5M	¥258	+1.9%	¥263M ($1.7M)
2026-04-10	BUY	Market Buy	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	activist	10.5M	¥236	+8.1%	¥292M ($1.9M)
2026-03-11	BUY	Market Buy	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	activist	9.3M	¥242	-5.8%	¥149M ($964K)
2026-03-10	BUY	Market Buy	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	activist	8.6M	¥238	-4.2%	¥235M ($1.5M)
2026-03-04	BUY	Market Buy	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	activist	7.7M	¥228	+0.0%	¥197M ($1.3M)
2026-02-17	BUY	Market Buy	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	activist	6.8M	¥223	+2.2%	¥337M ($2.2M)
2026-02-16	BUY	Market Buy	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	activist	5.3M	¥222	+2.7%	¥302M ($1.9M)
2026-02-09	BUY	Market Buy	シルバーケイプ・インベストメンツ・リミテッド(SilverCape Investments Limited) SilverCape Investments Limited	activist	3.9M	¥216	+5.6%	¥847M ($5.5M)
2023-10-03	SELL	unknown	LINEヤフー株式会社 LY Corporation	strategic	1.3M	¥136	-67.7%	¥4M ($27K)
2023-10-03	SELL	unknown	株式会社インターネット総合研究所 Internet Research Institute, Inc.	corporate	10.0M	¥136	-67.7%	¥30M ($194K)
2022-01-17	BUY	unknown	エフシージェイワン・カンパニー・リミテッド(FCJ 1 CO. LTD.) FCJ 1 CO. LTD.	strategic	9.9M	¥179	+27.4%	¥1.8B ($11.4M)
2021-06-07	BUY	unknown	Zホールディングス株式会社 Z Holdings Corporation	strategic	1.3M	¥242	-5.8%	¥316M ($2.0M)
2021-06-07	SELL	unknown	株式会社インターネット総合研究所 Internet Research Institute, Inc.	corporate	10.0M	¥242	+5.8%	¥157M ($1.0M)
2021-05-17	BUY	unknown	Zホールディングス株式会社 Z Holdings Corporation	strategic	1.3M	¥239	-4.6%	¥312M ($2.0M)
2021-05-17	BUY	unknown	Zホールディングス株式会社 Z Holdings Corporation	strategic	1.3M	¥239	-4.6%	¥312M ($2.0M)
2021-05-17	SELL	unknown	株式会社インターネット総合研究所 Internet Research Institute, Inc.	corporate	10.7M	¥239	+4.6%	¥144M ($929K)
2021-05-17	SELL	unknown	株式会社インターネット総合研究所 Internet Research Institute, Inc.	corporate	10.7M	¥239	+4.6%	¥144M ($929K)

Frequently asked questions

Who has been buying BroadBand Tower, Inc. stock?: 4 distinct investors have filed 10 disclosed large-shareholding filings in BroadBand Tower, Inc. (3776), most recently on 2026-05-14. 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 BroadBand Tower, Inc. have?: BroadBand Tower, Inc. has 10 buy-side and 5 sell-side disclosures on record, covering ¥2.0B ($13.0M) in total reported value, spanning 2021-05-17 to 2026-05-14.
Where does StockDrifts get BroadBand Tower, Inc. 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 BroadBand Tower, Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.