Who has been buying Mitsui & Co., Ltd. stock?

22 distinct investors have filed 13 disclosed large-shareholding filings in Mitsui & Co., Ltd. (8031), most recently on 2025-09-19. 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 Mitsui & Co., Ltd. have?

Mitsui & Co., Ltd. has 13 buy-side and 6 sell-side disclosures on record, covering ¥234.5B ($1.5B) in total reported value, spanning 2021-03-22 to 2025-09-19.

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 & Co., Ltd. 8031

Company

三井物産株式会社Mitsui & Co., Ltd.

Investors

Buys

Total Value

¥234.5B ($1.5B)

Avg Return

+227.20%

Last Filing

2025-09-19

Mitsui & Co., Ltd. (8031) has 13 disclosed large-shareholding filings and 6 disclosed disposals on record, filed by 22 distinct investors. Together those filings cover ¥234.5B ($1.5B) in reported transaction value. The earliest filing StockDrifts holds for Mitsui & Co., Ltd. is dated 2021-03-22; the most recent is 2025-09-19. Across these filings the average return since disclosure is +227.20%, 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
2026-07-01	BUY	block_purchase	ナショナル・インデムニティー・カンパニー(National Indemnity Company) National Indemnity Company	passive	310.3M	¥4,440	+16.2%	¥128.5B ($828.8M)
2025-09-19	SELL	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	6.6M	¥3,724	-38.6%	¥432.8B ($2.8B)
2025-09-19	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	68.2M	¥3,724	+38.6%	¥23.8B ($153.6M)
2025-09-19	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	86.8M	¥3,724	-38.6%	¥67.1B ($432.8M)
2025-03-17	BUY	Market Buy	ナショナル・インデムニティー・カンパニー(National Indemnity Company) National Indemnity Company	passive	285.4M	¥2,804	+84.1%	¥140.9B ($909.2M)
2023-06-19	BUY	Market Buy	ナショナル・インデムニティー・カンパニー(National Indemnity Company) National Indemnity Company	passive	125.0M	¥2,782	+85.5%	¥63.2B ($407.6M)
2022-11-21	BUY	negotiated	三菱UFJ国際投信株式会社 Mitsubishi UFJ Financial Group Inc.	passive	15.2M	¥1,921.5	+168.6%	¥6.4B ($41.5M)
2022-11-21	SELL	negotiated	株式会社三菱UFJ銀行 Mitsubishi UFJ Financial Group Inc.	strategic	6.1M	¥1,921.5	-168.6%	¥9.8B ($63.2M)
2022-11-21	BUY	Market Buy	ナショナル・インデムニティー・カンパニー(National Indemnity Company) National Indemnity Company	passive	105.4M	¥1,921.5	+168.6%	¥48.7B ($313.9M)
2022-11-21	BUY	negotiated	三菱UFJ信託銀行株式会社 Mitsubishi UFJ Financial Group Inc.	passive	49.4M	¥1,921.5	+168.6%	¥93.5B ($603.0M)
2022-09-06	BUY	Market Buy	ブラックロック・ジャパン株式会社 BlackRock Japan Co., Ltd.	passive	28.9M	¥1,599.5	+222.7%	¥12.0B ($77.2M)
2022-09-06	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 BlackRock Advisers, LLC	passive	1.7M	¥1,599.5	-	¥2.7B ($17.4M)
2022-09-06	BUY	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	1.6M	¥1,599.5	-	¥2.6B ($16.7M)
2022-09-06	BUY	Market Buy	ブラックロック・インベストメント・マネジメント (オーストラリア)リミテッドLimited) BlackRock Investment Management (Australia	passive	1.7M	¥1,599.5	-	¥2.7B ($17.5M)
2022-09-06	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	4.5M	¥1,599.5	-	¥7.2B ($46.4M)
2022-09-06	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	3.6M	¥1,599.5	+222.7%	¥1.3B ($8.2M)
2022-09-06	BUY	Market Buy	ブラックロック・ライフ・リミテッド BlackRock Life Limited	passive	740.3K	¥1,599.5	+222.7%	¥124.6B ($803.6M)
2022-09-06	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	1.9M	¥1,599.5	-	¥3.0B ($19.2M)
2022-09-06	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	9.3M	¥1,599.5	+222.7%	¥4.1B ($26.3M)
2022-09-06	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	22.9M	¥1,599.5	+222.7%	¥1.8B ($11.5M)
2022-09-06	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 BlackRock Institutional Trust Company, N.A.	passive	24.7M	¥1,599.5	+222.7%	¥3.1B ($19.7M)
2022-09-06	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	2.9M	¥1,599.5	-222.7%	¥5.1B ($32.9M)
2021-03-22	SELL	unknown	株式会社みずほ銀行 Mizuho Bank, Ltd.	strategic	6.7M	¥1,008.641	-411.7%	¥6.6B ($42.5M)
2021-03-22	SELL	unknown	みずほ証券株式会社 Mizuho Securities Co., Ltd.	other	2.0M	¥1,008.641	-411.7%	¥2.3B ($14.5M)
2021-03-22	BUY	unknown	アセットマネジメントOne株式会社 Asset Management One Co., Ltd.	other	60.5M	¥1,008.641	+411.7%	¥60.2B ($388.7M)

Frequently asked questions

Who has been buying Mitsui & Co., Ltd. stock?: 22 distinct investors have filed 13 disclosed large-shareholding filings in Mitsui & Co., Ltd. (8031), most recently on 2025-09-19. 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 Mitsui & Co., Ltd. have?: Mitsui & Co., Ltd. has 13 buy-side and 6 sell-side disclosures on record, covering ¥234.5B ($1.5B) in total reported value, spanning 2021-03-22 to 2025-09-19.
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.