Who has been buying Toyo Tanso Co., Ltd. stock?

19 distinct investors have filed 51 disclosed large-shareholding filings in Toyo Tanso Co., Ltd. (5310), most recently on 2026-03-16. 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 Toyo Tanso Co., Ltd. have?

Toyo Tanso Co., Ltd. has 51 buy-side and 43 sell-side disclosures on record, covering ¥77.0B ($496.8M) in total reported value, spanning 2021-03-19 to 2026-03-16.

Where does StockDrifts get Toyo Tanso 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.

Toyo Tanso Co., Ltd. 5310

Company

東洋炭素株式会社Toyo Tanso Co., Ltd.

Investors

Buys

Total Value

¥77.0B ($496.8M)

Avg Return

+33.51%

Last Filing

2026-03-16

Toyo Tanso Co., Ltd. (5310) has 51 disclosed large-shareholding filings and 43 disclosed disposals on record, filed by 19 distinct investors. Together those filings cover ¥77.0B ($496.8M) in reported transaction value. The earliest filing StockDrifts holds for Toyo Tanso Co., Ltd. is dated 2021-03-19; the most recent is 2026-03-16. 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 +33.51%, 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
2026-07-21	SELL	Market Buy	三菱UFJアセットマネジメント株式会社	passive	123.5K	¥6,660	-9.9%	¥937M ($6.0M)
2026-07-21	SELL	Market Buy	三菱UFJ信託銀行株式会社	passive	344.8K	¥6,660	-9.9%	¥503M ($3.2M)
2026-07-21	SELL	unknown	三菱UFJモルガン・スタンレー証券株式会社	other	2.5K	¥6,660	-9.9%	¥168M ($1.1M)
2026-07-21	BUY	negotiated	株式会社三菱UFJ銀行	strategic	360.0K	¥6,660	+9.9%	¥2.4B ($15.5M)
2026-07-17	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社	other	351.4K	¥6,480	-13.0%	¥1.4B ($8.9M)
2026-07-17	BUY	Market Buy	アモーヴァ・アセットマネジメント株式会社	other	1.6M	¥6,480	+13.0%	¥150M ($965K)
2026-07-17	BUY	negotiated	三井住友信託銀行株式会社	strategic	36.0K	¥6,480	+13.0%	¥233M ($1.5M)
2026-03-16	SELL	unknown	近藤泰嗣	strategic	172.4K	¥5,430	-11.4%	¥1.0B ($6.7M)
2026-03-16	SELL	unknown	近藤ホールディングス株式会社	strategic	1.2M	¥5,430	-11.4%	¥7.0B ($45.5M)
2026-03-13	BUY	negotiated	アモーヴァ・アセットマネジメント株式会社	other	1.6M	¥5,460	+10.8%	¥9.8B ($63.4M)
2026-03-13	BUY	negotiated	三井住友トラスト・アセットマネジメント株式会社	other	562.1K	¥5,460	+10.8%	¥3.4B ($21.9M)
2026-03-13	BUY	negotiated	三井住友信託銀行株式会社	strategic	36.0K	¥5,460	-10.8%	¥218M ($1.4M)
2026-03-05	BUY	unknown	野村アセットマネジメント株式会社	other	1.2M	¥5,670	+6.7%	¥7.4B ($47.8M)
2026-03-05	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	45.0K	¥5,670	-6.7%	¥272M ($1.8M)
2026-03-05	BUY	unknown	野村證券株式会社	other	151.1K	¥5,670	-6.7%	¥914M ($5.9M)
2026-03-05	BUY	negotiated	アモーヴァ・アセットマネジメント株式会社	other	1.4M	¥5,670	+6.7%	¥8.5B ($54.6M)
2026-03-05	SELL	negotiated	三井住友トラスト・アセットマネジメント株式会社	other	499.4K	¥5,670	-6.7%	¥3.0B ($19.5M)
2026-03-05	BUY	negotiated	三井住友信託銀行株式会社	strategic	36.0K	¥5,670	-6.7%	¥218M ($1.4M)
2026-02-04	SELL	unknown	ウエリントン・マネージメント・ジャパン・ピーティーイー・リミテッド（Wellington Management Japan Pte Ltd） Wellington Management Japan Pte Ltd	other	863.8K	¥5,560	-8.8%	¥1.2B ($7.9M)
2026-01-21	BUY	unknown	野村アセットマネジメント株式会社	other	1.2M	¥5,490	+10.2%	¥7.2B ($46.5M)
2026-01-21	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	116.5K	¥5,490	+10.2%	¥705M ($4.5M)
2026-01-21	SELL	unknown	野村證券株式会社	other	11.3K	¥5,490	-10.2%	¥68M ($439K)
2026-01-21	BUY	Market Buy	アモーヴァ・アセットマネジメント株式会社	other	1.2M	¥5,490	+10.2%	¥7.1B ($45.9M)
2026-01-21	BUY	Market Buy	三井住友トラスト・アセットマネジメント株式会社	other	533.5K	¥5,490	+10.2%	¥3.2B ($20.8M)
2026-01-21	BUY	Market Buy	三井住友信託銀行株式会社	strategic	36.0K	¥5,490	-10.2%	¥218M ($1.4M)
2026-01-19	BUY	negotiated	三菱UFJアセットマネジメント株式会社	passive	264.3K	¥5,590	+8.2%	¥1.6B ($10.3M)
2026-01-19	BUY	negotiated	三菱UFJモルガン・スタンレー証券株式会社	other	26.3K	¥5,590	+8.2%	¥159M ($1.0M)
2026-01-19	BUY	negotiated	三菱UFJ信託銀行株式会社	passive	420.5K	¥5,590	+8.2%	¥2.5B ($16.4M)
2026-01-19	BUY	negotiated	株式会社三菱UFJ銀行	strategic	360.0K	¥5,590	+8.2%	¥2.2B ($14.1M)
2025-12-04	BUY	Market Buy	アモーヴァ・アセットマネジメント株式会社	other	1.1M	¥4,745	+27.5%	¥6.6B ($42.8M)
2025-12-04	SELL	Market Buy	三井住友トラスト・アセットマネジメント株式会社	other	366.2K	¥4,745	-27.5%	¥2.2B ($14.3M)
2025-12-04	BUY	Market Buy	三井住友信託銀行株式会社	strategic	36.0K	¥4,745	-27.5%	¥218M ($1.4M)
2025-11-07	BUY	negotiated	アモーヴァ・アセットマネジメント株式会社 Amova Asset Management Co., Ltd.	other	652.9K	¥4,685	+29.1%	¥3.1B ($19.7M)
2025-11-07	BUY	negotiated	三井住友トラスト・アセットマネジメント株式会社 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	371.2K	¥4,685	+29.1%	¥1.7B ($11.2M)
2025-11-07	BUY	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.2M	¥4,685	+29.1%	¥10M ($63K)
2025-11-07	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	49.5K	¥4,685	+29.1%	¥334M ($2.2M)
2025-11-07	SELL	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	293.1K	¥4,685	-29.1%	¥236M ($1.5M)
2025-11-07	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	36.0K	¥4,685	+29.1%	¥169M ($1.1M)
2025-10-21	SELL	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.2M	¥4,700	-28.7%	¥10M ($64K)
2025-10-21	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	344.6K	¥4,700	+28.7%	¥1.6B ($10.4M)
2025-10-21	SELL	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	-20.2K	¥4,700	-28.7%	¥1.6B ($10.1M)
2025-09-04	BUY	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.2M	¥3,935	+53.8%	¥636M ($4.1M)
2025-09-04	SELL	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	313.4K	¥3,935	-53.8%	¥140M ($906K)
2025-07-04	SELL	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.0M	¥4,900	-23.5%	¥10M ($66K)
2025-07-04	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	348.6K	¥4,900	+23.5%	¥1.5B ($9.8M)
2025-07-04	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	5.7K	¥4,900	+23.5%	¥2.1B ($13.3M)
2025-05-20	BUY	unknown	ウエリントン・マネージメント・ジャパン・ピーティーイー・リミテッド(Wellington Management Japan Pte Ltd) Wellington Management Japan Pte Ltd	other	1.1M	¥4,085	+48.1%	¥4.4B ($28.5M)
2025-05-08	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	40.1K	¥4,025	-50.3%	¥659M ($4.3M)
2025-05-08	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	1.0M	¥4,025	+50.3%	¥482M ($3.1M)
2025-05-08	SELL	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	1.2K	¥4,025	-50.3%	¥27.0B ($174.4M)

Showing the 50 most recent of 127 filings.

Frequently asked questions

Who has been buying Toyo Tanso Co., Ltd. stock?: 19 distinct investors have filed 51 disclosed large-shareholding filings in Toyo Tanso Co., Ltd. (5310), most recently on 2026-03-16. 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 Toyo Tanso Co., Ltd. have?: Toyo Tanso Co., Ltd. has 51 buy-side and 43 sell-side disclosures on record, covering ¥77.0B ($496.8M) in total reported value, spanning 2021-03-19 to 2026-03-16.
Where does StockDrifts get Toyo Tanso 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 Toyo Tanso Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.