Who has been buying Sumitomo Metal Mining Co., Ltd. stock?

15 distinct investors have filed 13 disclosed large-shareholding filings in Sumitomo Metal Mining Co., Ltd. (5713), most recently on 2026-03-05. 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 Metal Mining Co., Ltd. have?

Sumitomo Metal Mining Co., Ltd. has 13 buy-side and 15 sell-side disclosures on record, covering ¥77.9B ($502.4M) in total reported value, spanning 2022-08-19 to 2026-03-05.

Where does StockDrifts get Sumitomo Metal Mining 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.

Sumitomo Metal Mining Co., Ltd. 5713

Company

住友金属鉱山株式会社Sumitomo Metal Mining Co., Ltd.

Investors

Buys

Total Value

¥77.9B ($502.4M)

Avg Return

+120.17%

Last Filing

2026-03-05

Sumitomo Metal Mining Co., Ltd. (5713) has 13 disclosed large-shareholding filings and 15 disclosed disposals on record, filed by 15 distinct investors. Together those filings cover ¥77.9B ($502.4M) in reported transaction value. The earliest filing StockDrifts holds for Sumitomo Metal Mining Co., Ltd. is dated 2022-08-19; the most recent is 2026-03-05. 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 +120.17%, 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
2026-03-05	SELL	unknown	アモーヴァ・アセットマネジメント株式会社	other	8.3M	¥10,535	+4.4%	¥83.2B ($537.0M)
2026-03-05	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社	other	7.6M	¥10,535	+4.4%	¥76.8B ($495.6M)
2026-03-05	BUY	unknown	三井住友信託銀行株式会社	other	1.5M	¥10,535	+4.4%	¥14.8B ($95.3M)
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	10.3M	¥4,150	+142.7%	¥6.9B ($44.4M)
2025-09-19	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	8.9M	¥4,150	-142.7%	¥483M ($3.1M)
2025-09-19	SELL	Market Buy	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	other	1.5M	¥4,150	-142.7%	¥313.8B ($2.0B)
2024-02-21	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	8.7M	¥4,108	+145.1%	¥358M ($2.3M)
2024-02-21	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	9.0M	¥4,108	-145.1%	¥2.3B ($14.6M)
2024-02-21	BUY	unknown	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	other	2.2M	¥4,108	+145.1%	¥9.0B ($58.3M)
2023-12-06	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	8.6M	¥4,217	-138.8%	¥2.6B ($16.6M)
2023-12-06	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	9.5M	¥4,217	-138.8%	¥5.4B ($34.8M)
2023-12-06	BUY	unknown	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	other	2.2M	¥4,217	+138.8%	¥9.3B ($59.9M)
2023-08-03	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	521.5K	¥4,770	+111.1%	¥2.5B ($16.0M)
2023-08-03	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	3.3M	¥4,770	-111.1%	¥694M ($4.5M)
2023-08-03	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	¥4,770	+111.1%	¥2.6B ($17.0M)
2023-08-03	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	2.8M	¥4,770	+111.1%	¥4.0B ($26.0M)
2023-08-03	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	371.5K	¥4,770	+111.1%	¥1.8B ($11.4M)
2023-08-03	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	768.0K	¥4,770	-111.1%	¥1.4B ($8.9M)
2023-08-03	SELL	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	634.0K	¥4,770	-111.1%	¥416M ($2.7M)
2023-08-03	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	361.4K	¥4,770	+111.1%	¥1.7B ($11.1M)
2023-08-03	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	295.6K	¥4,770	+111.1%	¥1.4B ($9.1M)
2023-08-03	BUY	Market Buy	アペリオ・グループ・エルエルシー(Aperio Group Aperio Group, LLC	passive	563.0K	¥4,770	+111.1%	¥139M ($895K)
2023-08-03	BUY	Market Buy	ブラックロック・ジャパン株式会社 BlackRock Japan Co., Ltd.	passive	5.8M	¥4,770	+111.1%	¥5.1B ($33.1M)
2023-01-19	BUY	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	10.8M	¥5,088	+97.9%	¥1.8B ($11.5M)
2023-01-19	BUY	unknown	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	other	2.2M	¥5,088	+97.9%	¥11.2B ($72.2M)
2023-01-19	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	9.2M	¥5,088	+97.9%	¥444M ($2.9M)
2022-12-06	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	9.1M	¥4,811	+109.3%	¥43.9B ($283.2M)
2022-12-06	BUY	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	10.5M	¥4,811	+109.3%	¥1.5B ($9.9M)
2022-12-06	BUY	unknown	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	other	2.2M	¥4,811	+109.3%	¥10.6B ($68.3M)
2022-10-20	SELL	unknown	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	other	2.2M	¥4,149	-142.7%	¥3.0B ($19.5M)
2022-10-20	BUY	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	9.1M	¥4,149	+142.7%	¥1.7B ($10.9M)
2022-10-20	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	10.1M	¥4,149	-142.7%	¥121M ($778K)
2022-08-19	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	524.3K	¥4,429	-127.4%	¥1.3B ($8.3M)
2022-08-19	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	3.5M	¥4,429	-127.4%	¥1.3B ($8.3M)
2022-08-19	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	4.5M	¥4,429	+127.4%	¥5.8B ($37.4M)
2022-08-19	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	2.0M	¥4,429	+127.4%	¥4.0B ($25.8M)
2022-08-19	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	1.0M	¥4,429	+127.4%	¥4.6B ($29.6M)
2022-08-19	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	734.2K	¥4,429	+127.4%	¥3.3B ($21.0M)
2022-08-19	BUY	Market Buy	アペリオ・グループ・エルエルシー(Aperio Group Aperio Group, LLC	passive	512.3K	¥4,429	+127.4%	¥2.3B ($14.6M)
2022-08-19	SELL	Market Buy	ブラックロック・ジャパン株式会社 BlackRock Japan Co., Ltd.	passive	4.7M	¥4,429	-127.4%	¥2.1B ($13.3M)
2022-08-19	BUY	Market Buy	ブラックロック・ライフ・リミテッド BlackRock Life Limited	passive	150.9K	¥4,429	+127.4%	¥61.8B ($398.9M)

Frequently asked questions

Who has been buying Sumitomo Metal Mining Co., Ltd. stock?: 15 distinct investors have filed 13 disclosed large-shareholding filings in Sumitomo Metal Mining Co., Ltd. (5713), most recently on 2026-03-05. 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 Metal Mining Co., Ltd. have?: Sumitomo Metal Mining Co., Ltd. has 13 buy-side and 15 sell-side disclosures on record, covering ¥77.9B ($502.4M) in total reported value, spanning 2022-08-19 to 2026-03-05.
Where does StockDrifts get Sumitomo Metal Mining 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 Sumitomo Metal Mining Co., Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.