Who has been buying Toagosei Co., Ltd. stock?

11 distinct investors have filed 15 disclosed large-shareholding filings in Toagosei Co., Ltd. (4045), most recently on 2026-03-23. 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 Toagosei Co., Ltd. have?

Toagosei Co., Ltd. has 15 buy-side and 12 sell-side disclosures on record, covering ¥17.8B ($115.1M) in total reported value, spanning 2022-04-22 to 2026-03-23.

Where does StockDrifts get Toagosei 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.

Toagosei Co., Ltd. 4045

Company

東亞合成株式会社Toagosei Co., Ltd.

Investors

Buys

Total Value

¥17.8B ($115.1M)

Avg Return

+38.30%

Last Filing

2026-03-23

Toagosei Co., Ltd. (4045) has 15 disclosed large-shareholding filings and 12 disclosed disposals on record, filed by 11 distinct investors. Together those filings cover ¥17.8B ($115.1M) in reported transaction value. The earliest filing StockDrifts holds for Toagosei Co., Ltd. is dated 2022-04-22; the most recent is 2026-03-23. 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 +38.30%, 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
2026-03-23	SELL	unknown	SMBC日興証券株式会社	other	82.0K	¥1,660.5	-7.5%	¥146M ($944K)
2026-03-23	SELL	unknown	株式会社三井住友銀行	other	4.1M	¥1,660.5	-7.5%	¥7.3B ($46.9M)
2025-09-30	SELL	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	63.6K	¥1,508	-18.4%	¥1.1B ($7.4M)
2025-09-30	SELL	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.1M	¥1,508	-18.4%	¥426M ($2.7M)
2025-09-30	SELL	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.3M	¥1,508	-18.4%	¥187M ($1.2M)
2025-09-30	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	2.3M	¥1,508	+18.4%	¥3.4B ($22.0M)
2025-08-06	SELL	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.3M	¥1,465	-21.8%	¥182M ($1.2M)
2025-08-06	SELL	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	2.3M	¥1,465	-21.8%	¥1.2B ($7.8M)
2025-08-06	SELL	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	1.2M	¥1,465	-21.8%	¥281M ($1.8M)
2025-08-04	BUY	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	2.3M	¥1,458.5	+22.4%	¥3.3B ($21.3M)
2025-08-04	BUY	negotiated	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	829.1K	¥1,458.5	+22.4%	¥1.2B ($7.8M)
2025-08-04	BUY	negotiated	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.4M	¥1,458.5	+22.4%	¥2.0B ($13.2M)
2025-08-04	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.5M	¥1,458.5	+22.4%	¥2.1B ($13.8M)
2025-07-18	BUY	Market Buy	モラント・ライト・マネジメント・リミテッド(Morant Wright Management Limited) Morant Wright Management Limited	passive	5.7M	¥1,446	+23.4%	¥8.2B ($53.2M)
2025-07-18	BUY	Market Buy	モラント・ライト・マネジメント・リミテッド(Morant Wright Management Limited) Morant Wright Management Limited	passive	5.7M	¥1,446	+23.4%	¥8.2B ($53.2M)
2024-07-29	BUY	Market Buy	三菱UFJモルガン・スタンレー証券株式会社 Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.	other	39.2K	¥1,547	+15.4%	¥5.0B ($32.4M)
2024-07-29	BUY	Market Buy	三菱UFJアセットマネジメント株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.1M	¥1,547	+15.4%	¥851M ($5.5M)
2024-07-29	SELL	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	1.6M	¥1,547	-15.4%	¥1.7B ($11.0M)
2024-07-29	BUY	Market Buy	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	2.5M	¥1,547	+15.4%	¥54M ($351K)
2023-03-06	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	1.5M	¥1,287	+38.7%	¥2.0B ($12.7M)
2023-03-06	SELL	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	3.3M	¥1,287	-38.7%	¥173M ($1.1M)
2023-03-06	BUY	negotiated	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.5M	¥1,287	+38.7%	¥63M ($406K)
2023-01-10	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 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	3.5M	¥1,108	+61.1%	¥176M ($1.1M)
2023-01-10	BUY	Market Buy	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	1.5M	¥1,108	+61.1%	¥41M ($262K)
2023-01-10	BUY	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.5M	¥1,108	+61.1%	¥162M ($1.0M)
2022-09-22	SELL	Market Buy	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	1.4M	¥1,100	-62.3%	¥964M ($6.2M)
2022-09-22	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 Sumitomo Mitsui Trust Asset Management Co.,Ltd.	other	3.4M	¥1,100	-62.3%	¥96M ($622K)
2022-09-22	BUY	Market Buy	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	1.5M	¥1,100	+62.3%	¥83M ($533K)
2022-04-22	BUY	unknown	SMBC日興証券株式会社 SMBC Nikko Securities Inc.	other	472.0K	¥1,078	+65.6%	¥509M ($3.3M)
2022-04-22	BUY	unknown	株式会社三井住友銀行 Sumitomo Mitsui Banking Corporation	other	5.8M	¥1,078	+65.6%	¥6.3B ($40.5M)

Frequently asked questions

Who has been buying Toagosei Co., Ltd. stock?: 11 distinct investors have filed 15 disclosed large-shareholding filings in Toagosei Co., Ltd. (4045), most recently on 2026-03-23. 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 Toagosei Co., Ltd. have?: Toagosei Co., Ltd. has 15 buy-side and 12 sell-side disclosures on record, covering ¥17.8B ($115.1M) in total reported value, spanning 2022-04-22 to 2026-03-23.
Where does StockDrifts get Toagosei 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 Toagosei Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.