Who has been buying Mitsui Chemicals, Inc. stock?

28 distinct investors have filed 51 disclosed large-shareholding filings in Mitsui Chemicals, Inc. (4183), most recently on 2026-04-03. 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 Mitsui Chemicals, Inc. have?

Mitsui Chemicals, Inc. has 51 buy-side and 32 sell-side disclosures on record, covering ¥78.6B ($506.8M) in total reported value, spanning 2021-07-20 to 2026-04-03.

Where does StockDrifts get Mitsui Chemicals, 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.

Mitsui Chemicals, Inc. 4183

Company

三井化学株式会社Mitsui Chemicals, Inc.

Investors

Buys

Total Value

¥78.6B ($506.8M)

Avg Return

+8.95%

Last Filing

2026-04-03

Mitsui Chemicals, Inc. (4183) has 51 disclosed large-shareholding filings and 32 disclosed disposals on record, filed by 28 distinct investors. Together those filings cover ¥78.6B ($506.8M) in reported transaction value. The earliest filing StockDrifts holds for Mitsui Chemicals, Inc. is dated 2021-07-20; the most recent is 2026-04-03. 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 +8.95%, 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
2026-04-03	BUY	Market Buy	ブラックロック(ルクセンブルグ)エス・エーS.A.) BlackRock (Luxembourg	passive	458.5K	¥1,881	+1.0%	¥862M ($5.6M)
2026-04-03	BUY	Market Buy	ブラックロック・ファンド・マネジャーズ・リミテッド BlackRock Fund Managers Limited	passive	552.2K	¥1,881	+1.0%	¥1.0B ($6.7M)
2026-04-03	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	572.4K	¥1,881	+1.0%	¥1.1B ($6.9M)
2026-04-03	BUY	Market Buy	ブラックロック・インスティテューショナル・トラスト・カンパニー、エヌ.エイ.(BlackRock Institutional Trust Company	passive	4.7M	¥1,881	+1.0%	¥8.8B ($57.0M)
2026-04-03	BUY	Market Buy	ブラックロック・ファンド・アドバイザーズ BlackRock Fund Advisors	passive	5.0M	¥1,881	+1.0%	¥9.3B ($60.2M)
2026-04-03	BUY	Market Buy	ブラックロック・アセット・マネジメント・アイルランド・リミテッド BlackRock Asset Management Ireland Limited	passive	921.0K	¥1,881	+1.0%	¥1.7B ($11.2M)
2026-04-03	BUY	Market Buy	ブラックロック・フィナンシャル・マネジメント・インク(BlackRock Financial Management	passive	980.2K	¥1,881	+1.0%	¥1.8B ($11.9M)
2026-04-03	BUY	Market Buy	ブラックロック・アドバイザーズ・エルエルシー(BlackRock Advisers	passive	444.2K	¥1,881	+1.0%	¥836M ($5.4M)
2026-04-03	BUY	Market Buy	ブラックロック・ジャパン株式会社	passive	7.2M	¥1,881	+1.0%	¥13.6B ($87.5M)
2025-11-20	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	11.7M	¥1,793.5	-10.3%	¥1.8B ($11.9M)
2025-11-20	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	30.4K	¥1,793.5	-10.3%	¥4.0B ($26.0M)
2025-11-20	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	489.2K	¥1,793.5	+10.3%	¥792M ($5.1M)
2025-10-20	SELL	Market Buy	MUFGセキュリティーズEMEA MUFG Securities EMEA plc	other	61.8K	¥1,825	-8.4%	¥1.2B ($7.6M)
2025-10-20	BUY	Market Buy	MUFGセキュリティーズ(カナダ) MUFG Securities(Canada	other	1.6M	¥1,825	+8.4%	¥2.0B ($13.0M)
2025-10-20	SELL	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	233.5K	¥1,825	-8.4%	¥1.6B ($10.4M)
2025-10-20	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	3.6M	¥1,825	+8.4%	¥6.7B ($43.0M)
2025-10-20	BUY	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	4.3M	¥1,825	+8.4%	¥440M ($2.8M)
2025-09-19	BUY	Market Buy	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	5.7M	¥1,855.5	+6.6%	¥1.7B ($11.1M)
2025-09-19	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	5.5M	¥1,855.5	+6.6%	¥261M ($1.7M)
2025-09-19	SELL	Market Buy	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	unknown	0	¥1,855.5	-6.6%	¥130.4B ($841.5M)
2025-07-22	BUY	Market Buy	MUFGセキュリティーズ(カナダ) MUFG Securities(Canada	other	500.0K	¥1,677	+17.9%	¥839M ($5.4M)
2025-07-22	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	1.1M	¥1,677	+17.9%	¥1.9B ($12.1M)
2025-07-22	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	3.7M	¥1,677	+17.9%	¥6.1B ($39.6M)
2025-07-22	BUY	Market Buy	MUFGセキュリティーズEMEA MUFG Securities EMEA plc	other	701.0K	¥1,677	+17.9%	¥1.2B ($7.6M)
2025-07-22	BUY	Market Buy	MUFGセキュリティーズ(カナダ) MUFG Securities(Canada	other	500.0K	¥1,677	+17.9%	¥839M ($5.4M)
2025-07-22	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	1.1M	¥1,677	+17.9%	¥1.9B ($12.1M)
2025-07-22	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	3.7M	¥1,677	+17.9%	¥6.1B ($39.6M)
2025-07-22	BUY	Market Buy	MUFGセキュリティーズEMEA MUFG Securities EMEA plc	other	701.0K	¥1,677	+17.9%	¥1.2B ($7.6M)
2025-07-22	BUY	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	4.1M	¥1,677	+17.9%	¥6.9B ($44.3M)
2025-07-22	BUY	Market Buy	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	4.1M	¥1,677	+17.9%	¥6.9B ($44.3M)
2025-04-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	11.2M	¥1,480.75	+33.6%	¥16.3B ($105.5M)
2025-04-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	607.3K	¥1,480.75	-33.6%	¥268M ($1.7M)
2025-04-22	SELL	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	unknown	0	¥1,480.75	-33.6%	¥83.3B ($537.2M)
2025-03-07	SELL	Market Buy	ブラックロック・インスティテューショナル・トラスト・カンパニー、エヌ.エイ.(BlackRock Institutional Trust Company BlackRock Institutional Trust Company, N.A.	passive	1.6M	¥1,747.5	-13.2%	¥1.3B ($8.4M)
2025-03-07	SELL	Market Buy	ブラックロック・アセット・マネジメント・アイルランド・リミテッド BlackRock Asset Management Ireland Limited	passive	383.7K	¥1,747.5	-13.2%	¥2.1B ($13.4M)
2025-03-07	BUY	Market Buy	ブラックロック・アセット・マネジメント・カナダ・リミテッド BlackRock Asset Management Canada Limited	passive	71.7K	¥1,747.5	+13.2%	¥13.5B ($87.4M)
2025-03-07	SELL	Market Buy	ブラックロック・ファンド・マネジャーズ・リミテッド BlackRock Fund Managers Limited	passive	402.5K	¥1,747.5	-13.2%	¥35M ($226K)
2025-03-07	SELL	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	296.8K	¥1,747.5	-13.2%	¥281M ($1.8M)
2025-03-07	SELL	Market Buy	ブラックロック・インベストメント・マネジメント・エルエルシー BlackRock Investment Management LLC	passive	5.3K	¥1,747.5	-13.2%	¥351M ($2.3M)
2025-03-07	SELL	Market Buy	ブラックロック・ファンド・アドバイザーズ BlackRock Fund Advisors	passive	2.1M	¥1,747.5	-13.2%	¥2.5B ($16.3M)
2025-03-07	SELL	Market Buy	ブラックロック・ジャパン株式会社 BlackRock Japan Co., Ltd.	passive	3.5M	¥1,747.5	-13.2%	¥175M ($1.1M)
2025-03-06	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	12.7M	¥1,755	+12.7%	¥106M ($682K)
2025-03-06	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	2.3M	¥1,755	+12.7%	¥4.0B ($25.8M)
2025-03-06	SELL	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	45.1K	¥1,755	-12.7%	¥42.3B ($272.9M)
2024-09-24	SELL	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	12.6M	¥1,944	-1.8%	¥1.3B ($8.3M)
2024-09-24	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	31.4K	¥1,944	+1.8%	¥6.9B ($44.8M)
2024-09-24	SELL	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	564.2K	¥1,944	-1.8%	¥1.1B ($7.1M)
2024-09-24	BUY	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	774.0K	¥1,944	+1.8%	¥1.5B ($9.7M)
2024-03-05	SELL	Market Buy	ブラックロック・インベストメント・マネジメント(ユーケー)リミテッドLimited) BlackRock Investment Management (UK	passive	183.7K	¥2,092	+5.5%	¥2.1B ($13.6M)
2024-03-05	SELL	Market Buy	ブラックロック・インスティテューショナル・トラスト・カンパニー、エヌ.エイ.(BlackRock Institutional Trust Company BlackRock Institutional Trust Company, N.A.	passive	2.4M	¥2,092	+5.5%	¥1.2B ($7.9M)

Showing the 50 most recent of 94 filings.

Frequently asked questions

Who has been buying Mitsui Chemicals, Inc. stock?: 28 distinct investors have filed 51 disclosed large-shareholding filings in Mitsui Chemicals, Inc. (4183), most recently on 2026-04-03. 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 Mitsui Chemicals, Inc. have?: Mitsui Chemicals, Inc. has 51 buy-side and 32 sell-side disclosures on record, covering ¥78.6B ($506.8M) in total reported value, spanning 2021-07-20 to 2026-04-03.
Where does StockDrifts get Mitsui Chemicals, 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 Mitsui Chemicals, Inc.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.