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

11 distinct investors have filed 16 disclosed large-shareholding filings in Toyo Gosei Co.,Ltd. (4970), most recently on 2026-03-18. 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 Gosei Co.,Ltd. have?

Toyo Gosei Co.,Ltd. has 16 buy-side and 8 sell-side disclosures on record, covering ¥8.4B ($54.5M) in total reported value, spanning 2021-04-09 to 2026-03-18.

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 Gosei Co.,Ltd. 4970

Company

東洋合成工業株式会社Toyo Gosei Co.,Ltd.

Investors

Buys

Total Value

¥8.4B ($54.5M)

Avg Return

+45.78%

Last Filing

2026-03-18

Toyo Gosei Co.,Ltd. (4970) has 16 disclosed large-shareholding filings and 8 disclosed disposals on record, filed by 11 distinct investors. Together those filings cover ¥8.4B ($54.5M) in reported transaction value. The earliest filing StockDrifts holds for Toyo Gosei Co.,Ltd. is dated 2021-04-09; the most recent is 2026-03-18. Across these filings the average return since disclosure is +45.78%, 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
2026-09-07	SELL	unknown	フィデリティ・マネジメント・アンド・リサーチ・ジャパン株式会社 Fidelity Management & Research (Japan) Limited	other	286.4K	¥10,680	+10.0%	¥1.3B ($8.4M)
2026-07-23	BUY	unknown	エフエムアールインベストメントマネジメントユーケーリミテッドLimited) FMR Investment Management (UK	other	102.2K	¥15,440	-37.8%	¥1.6B ($10.2M)
2026-07-23	BUY	unknown	フィデリティ・マネジメント・アンド・リサーチ・ジャパン株式会社	other	306.6K	¥15,440	-37.8%	¥4.7B ($30.5M)
2026-06-23	SELL	unknown	エフエムアールインベストメントマネジメントユーケーリミテッドLimited) FMR Investment Management (UK	other	85.6K	¥16,600	+42.1%	¥419M ($2.7M)
2026-06-23	SELL	unknown	フィデリティ・マネジメント・アンド・リサーチ・ジャパン株式会社	other	310.3K	¥16,600	+42.1%	¥1.2B ($7.5M)
2026-06-23	BUY	Market Buy	エフエムアールインベストメントマネジメントユーケーリミテッドLimited) FMR Investment Management (UK	other	110.7K	¥16,600	-42.1%	¥608M ($3.9M)
2026-06-23	BUY	Market Buy	フィデリティ・マネジメント・アンド・リサーチ・ジャパン株式会社	other	380.4K	¥16,600	-42.1%	¥689M ($4.4M)
2026-06-09	BUY	unknown	エフエムアールインベストメントマネジメントユーケーリミテッドLimited) FMR Investment Management (UK	other	73.7K	¥15,010	-36.0%	¥1.1B ($7.1M)
2026-06-09	BUY	unknown	フィデリティ・マネジメント・アンド・リサーチ・ジャパン株式会社	other	338.5K	¥15,010	-36.0%	¥5.1B ($32.8M)
2026-05-22	SELL	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	395.9K	¥17,110	+43.8%	¥1.6B ($10.5M)
2026-05-22	SELL	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	395.9K	¥17,110	+43.8%	¥1.6B ($10.5M)
2026-03-18	SELL	unknown	アリアンツ・グローバル・インベスターズ・アジア・パシフィック・リミテッド(Allianz Global Investors Asia Pacific Limited) Allianz Global Investors Asia Pacific Limited	other	348.6K	¥10,420	+7.8%	¥993M ($6.4M)
2026-02-20	BUY	Market Buy	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	491.1K	¥11,460	-16.1%	¥905M ($5.8M)
2026-02-20	BUY	Market Buy	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	491.1K	¥11,460	-16.1%	¥905M ($5.8M)
2025-11-21	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	412.2K	¥6,150	+56.3%	¥2.5B ($16.4M)
2025-11-21	BUY	unknown	エフエムアールエルエルシー(FMR LLC) FMR LLC	other	412.2K	¥6,150	+56.3%	¥2.5B ($16.4M)
2025-06-06	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	60.0K	¥4,625	-	-
2025-06-06	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	80.0K	¥4,625	-	-
2025-06-06	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	192.5K	¥4,625	-107.8%	¥418M ($2.7M)
2025-02-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	60.0K	¥5,230	-	-
2025-02-07	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	80.0K	¥5,230	-	-
2025-02-07	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	282.5K	¥5,230	-83.8%	¥549M ($3.5M)
2024-11-08	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	387.4K	¥7,100	-35.4%	¥584M ($3.8M)
2024-11-08	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	60.0K	¥7,100	-	-
2024-11-08	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	80.0K	¥7,100	-	-
2024-02-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	470.1K	¥9,610	+0.0%	¥783M ($5.0M)
2024-02-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	60.0K	¥9,610	-	-
2024-02-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	100	¥9,610	+0.0%	¥110M ($707K)
2024-02-22	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	80.0K	¥9,610	-	-
2024-02-22	BUY	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	2.3K	¥9,610	+0.0%	¥2.0B ($13.0M)
2023-07-07	SELL	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー(Capital Research and Management Company) Capital Research and Management Company	passive	383.7K	¥9,440	-1.8%	¥1.8B ($11.4M)
2023-06-07	SELL	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー(Capital Research and Management Company) Capital Research and Management Company	passive	570.4K	¥8,150	-17.9%	¥1.1B ($7.2M)
2023-02-22	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー(Capital Research and Management Company) Capital Research and Management Company	passive	706.1K	¥8,190	+17.3%	¥460M ($3.0M)
2023-02-06	BUY	unknown	アリアンツ・グローバル・インベスターズ・アジア・パシフィック・リミテッド Allianz Global Investors Asia Pacific Limited	other	443.6K	¥8,840	+8.7%	¥3.9B ($25.3M)
2022-12-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	388.1K	¥7,360	+30.6%	¥713M ($4.6M)
2022-12-22	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	60.0K	¥7,360	-	-
2022-12-22	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	11.6K	¥7,360	+30.6%	¥12M ($77K)
2022-12-22	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	80.0K	¥7,360	-	-
2022-12-22	BUY	unknown	アセットマネジメントOneインターナショナル Asset Management One International Ltd.	other	34.9K	¥7,360	-	¥257M ($1.7M)
2022-12-07	BUY	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	60.0K	¥9,000	+6.8%	¥540M ($3.5M)
2022-12-07	BUY	unknown	みずほ信託銀行株式会社 Mizuho Trust & Banking Co., Ltd.	strategic	80.0K	¥9,000	+6.8%	¥720M ($4.6M)
2022-12-07	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	291.5K	¥9,000	+6.8%	¥2.6B ($16.9M)
2022-12-07	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	9.5K	¥9,000	+6.8%	¥86M ($552K)
2022-09-07	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー(Capital Research and Management Company) Capital Research and Management Company	passive	650.0K	¥7,710	+24.6%	¥942M ($6.1M)
2022-05-20	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー(Capital Research and Management Company) Capital Research and Management Company	passive	527.4K	¥8,050	+19.4%	¥656M ($4.2M)
2022-04-07	BUY	Market Buy	キャピタル・リサーチ・アンド・マネージメント・カンパニー(Capital Research and Management Company) Capital Research and Management Company	passive	445.9K	¥10,660	-9.8%	¥4.8B ($30.7M)
2021-04-09	SELL	unknown	木村正輝(相続人代表木村正子) Masaki Kimura (Heir Representative Masako Kimura)	unknown	0	¥12,820	+25.0%	¥36M ($230K)
2021-04-09	BUY	unknown	木村正子 Masako Kimura	strategic	205.4K	¥12,820	-25.0%	¥2.3B ($14.7M)
2021-04-09	BUY	unknown	木村愛理 Airi Kimura	strategic	583.0K	¥12,820	-	-

Frequently asked questions

Who has been buying Toyo Gosei Co.,Ltd. stock?: 11 distinct investors have filed 16 disclosed large-shareholding filings in Toyo Gosei Co.,Ltd. (4970), most recently on 2026-03-18. 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 Gosei Co.,Ltd. have?: Toyo Gosei Co.,Ltd. has 16 buy-side and 8 sell-side disclosures on record, covering ¥8.4B ($54.5M) in total reported value, spanning 2021-04-09 to 2026-03-18.
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.