Who has been buying J.S.B.Co.,Ltd. stock?

10 distinct investors have filed 31 disclosed large-shareholding filings in J.S.B.Co.,Ltd. (3480), most recently on 2026-03-19. 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 J.S.B.Co.,Ltd. have?

J.S.B.Co.,Ltd. has 31 buy-side and 15 sell-side disclosures on record, covering ¥27.6B ($178.4M) in total reported value, spanning 2021-08-05 to 2026-03-19.

Where does StockDrifts get J.S.B.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.

J.S.B.Co.,Ltd. 3480

Company

株式会社ジェイ・エス・ビーJ.S.B.Co.,Ltd.

Investors

Buys

Total Value

¥27.6B ($178.4M)

Avg Return

+137.91%

Last Filing

2026-03-19

J.S.B.Co.,Ltd. (3480) has 31 disclosed large-shareholding filings and 15 disclosed disposals on record, filed by 10 distinct investors. Together those filings cover ¥27.6B ($178.4M) in reported transaction value. The earliest filing StockDrifts holds for J.S.B.Co.,Ltd. is dated 2021-08-05; the most recent is 2026-03-19. 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 +137.91%, 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	Market Buy	野村アセットマネジメント株式会社	other	254.5K	¥8,970	-1.7%	¥394M ($2.5M)
2026-08-07	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	34.4K	¥8,970	+1.7%	¥12.2B ($79.0M)
2026-08-07	BUY	Market Buy	野村證券株式会社	other	3.8K	¥8,970	-1.7%	¥20M ($127K)
2026-08-03	SELL	unknown	株式会社UH Partners 3	unknown	0	¥8,990	+1.9%	¥9.2B ($59.7M)
2026-08-03	SELL	unknown	株式会社UH Partners 2	unknown	0	¥8,990	+1.9%	¥14.2B ($91.7M)
2026-08-03	SELL	unknown	光通信株式会社	unknown	0	¥8,990	+1.9%	¥13.4B ($86.3M)
2026-07-31	BUY	subscription	Ursa 4株式会社 Ursa 4 Kabushiki Kaisha	activist	19.7M	¥8,960	-1.6%	¥176.8B ($1.1B)
2026-07-31	BUY	subscription	Ursa 4株式会社 Ursa 4 Kabushiki Kaisha	activist	19.7M	¥8,960	-1.6%	¥176.8B ($1.1B)
2026-07-30	SELL	unknown	OMインベストメント株式会社	activist	0	¥9,230	+4.4%	¥10.5B ($67.9M)
2026-07-30	SELL	subscription	岡靖子	activist	0	¥9,230	+4.4%	¥66.4B ($428.4M)
2026-07-22	SELL	unknown	野村證券株式会社	other	2.7K	¥9,010	+2.1%	¥2.8B ($18.0M)
2026-07-22	SELL	unknown	野村アセットマネジメント株式会社	other	211.8K	¥9,010	+2.1%	¥475M ($3.1M)
2026-07-22	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	1.4M	¥9,010	-2.1%	¥4.8B ($30.8M)
2026-07-07	BUY	unknown	野村アセットマネジメント株式会社	other	263.4K	¥8,980	-0.2%	¥2.4B ($15.3M)
2026-07-07	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	869.6K	¥8,980	-0.2%	¥7.8B ($50.4M)
2026-07-07	BUY	unknown	野村證券株式会社	other	311.1K	¥8,980	-0.2%	¥2.8B ($18.0M)
2026-07-01	SELL	unknown	NEUBERGER BERMAN TAIWANLIMITED SITE	other	25.8K	¥8,980	+0.2%	¥197M ($1.3M)
2026-07-01	SELL	unknown	ニューバーガー・バーマン株式会社	other	0	¥8,980	+0.2%	¥14.3B ($92.1M)
2026-06-19	BUY	Market Buy	株式会社UH Partners 3	passive	1.0M	¥8,980	+0.0%	¥394M ($2.5M)
2026-06-19	BUY	Market Buy	株式会社UH Partners 2	passive	1.6M	¥8,980	+0.0%	¥14.2B ($91.5M)
2026-06-19	BUY	Market Buy	光通信株式会社	passive	1.5M	¥8,980	+0.0%	¥138M ($891K)
2026-06-18	SELL	unknown	OMインベストメント株式会社	activist	1.1M	¥8,980	+0.0%	¥237M ($1.5M)
2026-06-18	SELL	subscription	岡靖子	activist	7.2M	¥8,980	+0.0%	¥1.5B ($9.9M)
2026-03-19	BUY	Market Buy	株式会社UH Partners 3	passive	983.5K	¥3,370	+54.0%	¥5.1B ($32.9M)
2026-03-19	SELL	Market Buy	株式会社UH Partners 2	passive	1.6M	¥3,370	-54.0%	¥8.2B ($52.9M)
2026-03-19	BUY	Market Buy	光通信株式会社	passive	1.5M	¥3,370	+54.0%	¥7.6B ($49.2M)
2026-01-05	BUY	Market Buy	NEUBERGER BERMAN TAIWANLIMITED SITE	other	48.4K	¥3,465	+49.8%	¥251M ($1.6M)
2026-01-05	BUY	Market Buy	ニューバーガー・バーマン株式会社	other	1.6M	¥3,465	+49.8%	¥8.3B ($53.2M)
2025-10-01	BUY	Market Buy	NEUBERGER BERMAN TAIWANLIMITED SITE	other	34.9K	¥3,950	+31.4%	¥61M ($391K)
2025-10-01	BUY	unknown	NEUBERGER BERMAN TAIWANLIMITED SITE	other	34.9K	¥3,950	+31.4%	¥61M ($391K)
2025-10-01	BUY	unknown	ニューバーガー・バーマン株式会社 Neuberger Berman East Asia Limited	other	1.4M	¥3,950	+31.4%	¥901M ($5.8M)
2025-10-01	BUY	Market Buy	ニューバーガー・バーマン株式会社 Neuberger Berman East Asia Limited	other	1.4M	¥3,950	+31.4%	¥901M ($5.8M)
2025-09-26	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	790.0K	¥4,125	+25.8%	¥36M ($234K)
2025-09-26	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.6M	¥4,125	+25.8%	¥6.5B ($42.0M)
2025-09-26	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.4M	¥4,125	+25.8%	¥5.9B ($38.3M)
2025-09-19	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	780.9K	¥3,900	+33.1%	¥864M ($5.6M)
2025-09-19	SELL	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.6M	¥3,900	-33.1%	¥9M ($55K)
2025-09-19	BUY	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.4M	¥3,900	+33.1%	¥5.6B ($36.2M)
2025-06-02	BUY	unknown	NEUBERGER BERMAN TAIWANLIMITED SITE	other	19.1K	¥3,750	+38.4%	¥72M ($462K)
2025-06-02	BUY	unknown	ニューバーガー・バーマン株式会社 Neuberger Berman East Asia Limited	other	1.1M	¥3,750	+38.4%	¥4.3B ($27.8M)
2025-02-20	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	559.3K	¥3,155	+64.5%	¥719M ($4.6M)
2025-02-20	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.6M	¥3,155	+64.5%	¥5.0B ($32.2M)
2025-02-20	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.4M	¥3,155	-64.5%	¥7M ($45K)
2025-01-15	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	331.8K	¥2,747	+88.9%	¥608M ($3.9M)
2025-01-15	SELL	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.6M	¥2,747	-88.9%	¥18M ($117K)
2025-01-15	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.4M	¥2,747	-88.9%	¥12M ($78K)
2024-08-02	BUY	Market Buy	株式会社UH Partners 3 UH Partners 3 Co., Ltd.	passive	109.4K	¥2,612	+98.7%	¥286M ($1.8M)
2024-08-02	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.6M	¥2,612	+98.7%	¥297M ($1.9M)
2024-08-02	SELL	Market Buy	光通信株式会社 Hikari Tsushin K.K.	passive	1.4M	¥2,612	-98.7%	¥6M ($37K)
2023-12-25	BUY	Market Buy	株式会社UH Partners 2 UH Partners 2, Inc.	passive	1.5M	¥2,454	+111.5%	¥535M ($3.5M)

Showing the 50 most recent of 79 filings.

Frequently asked questions

Who has been buying J.S.B.Co.,Ltd. stock?: 10 distinct investors have filed 31 disclosed large-shareholding filings in J.S.B.Co.,Ltd. (3480), most recently on 2026-03-19. 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 J.S.B.Co.,Ltd. have?: J.S.B.Co.,Ltd. has 31 buy-side and 15 sell-side disclosures on record, covering ¥27.6B ($178.4M) in total reported value, spanning 2021-08-05 to 2026-03-19.
Where does StockDrifts get J.S.B.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 J.S.B.Co.,Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.