Who has been buying Sumitomo Corporation stock?

18 distinct investors have filed 12 disclosed large-shareholding filings in Sumitomo Corporation (8053), 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 Sumitomo Corporation have?

Sumitomo Corporation has 12 buy-side and 4 sell-side disclosures on record, covering ¥62.0B ($400.2M) in total reported value, spanning 2021-10-06 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.

Sumitomo Corporation 8053

Company

住友商事株式会社Sumitomo Corporation

Investors

Buys

Total Value

¥62.0B ($400.2M)

Avg Return

+202.70%

Last Filing

2025-09-19

Sumitomo Corporation (8053) has 12 disclosed large-shareholding filings and 4 disclosed disposals on record, filed by 18 distinct investors. Together those filings cover ¥62.0B ($400.2M) in reported transaction value. The earliest filing StockDrifts holds for Sumitomo Corporation is dated 2021-10-06; the most recent is 2025-09-19. Across these filings the average return since disclosure is +202.70%, 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
2026-05-19	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	123.1M	¥7,217	-75.1%	¥87.1B ($562.0M)
2025-09-19	BUY	unknown	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	25.5M	¥4,364	-58.9%	¥3.7B ($23.9M)
2025-09-19	SELL	unknown	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	37.4M	¥4,364	+58.9%	¥12.7B ($81.9M)
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	112.5M	¥3,505	-48.8%	¥45.0B ($290.3M)
2023-08-21	SELL	unknown	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	40.7M	¥2,862	+37.3%	¥36.4B ($234.8M)
2023-08-21	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	25.0M	¥2,862	-37.3%	¥2.8B ($18.1M)
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	101.2M	¥3,059	-41.3%	¥62.5B ($403.1M)
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	82.3M	¥2,197	-18.3%	¥42.1B ($271.4M)
2021-10-06	BUY	Market Buy	ブラックロック・ジャパン株式会社 BlackRock Japan Co., Ltd.	passive	18.3M	¥1,588	+13.1%	¥8.1B ($52.6M)
2021-10-06	SELL	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	1.2M	¥1,588	-13.1%	¥8.3B ($53.8M)
2021-10-06	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 BlackRock Financial Management, Inc.	passive	1.4M	¥1,588	-	¥2.3B ($14.7M)
2021-10-06	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	1.5M	¥1,588	-	-
2021-10-06	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	4.4M	¥1,588	-	¥6.9B ($44.7M)
2021-10-06	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	2.2M	¥1,588	-	¥3.4B ($22.2M)
2021-10-06	SELL	Market Buy	ブラックロック・ライフ・リミテッド BlackRock Life Limited	passive	903.8K	¥1,588	-13.1%	¥4.2B ($26.9M)
2021-10-06	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	1.4M	¥1,588	-	¥2.2B ($14.3M)
2021-10-06	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	7.7M	¥1,588	+13.1%	¥4.2B ($26.9M)
2021-10-06	BUY	Market Buy	ブラックロック・アドバイザーズリミテッドLimited) UK	passive	187.9K	¥1,588	+13.1%	¥36.8B ($237.2M)
2021-10-06	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	17.8M	¥1,588	+13.1%	¥9.1B ($59.0M)
2021-10-06	BUY	Market Buy	ブラックロック・インターナショナル・リミテッド BlackRock International Limited	passive	71.6K	¥1,588	+13.1%	¥16.7B ($107.7M)
2021-10-06	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	21.3M	¥1,588	+13.1%	¥10.5B ($68.0M)
2021-10-06	BUY	Market Buy	ブラックロック・インベストメント・マネジメント(ユーケー)リミテッドLimited) BlackRock Investment Management (UK	passive	2.0M	¥1,588	-	¥3.2B ($20.6M)
2021-10-06	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	132.1K	¥1,588	+13.1%	¥15.9B ($102.6M)

Frequently asked questions

Who has been buying Sumitomo Corporation stock?: 18 distinct investors have filed 12 disclosed large-shareholding filings in Sumitomo Corporation (8053), 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 Sumitomo Corporation have?: Sumitomo Corporation has 12 buy-side and 4 sell-side disclosures on record, covering ¥62.0B ($400.2M) in total reported value, spanning 2021-10-06 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.