Who has been buying Sumitomo Heavy Industries, Ltd. stock?

17 distinct investors have filed 56 disclosed large-shareholding filings in Sumitomo Heavy Industries, Ltd. (6302), most recently on 2026-04-21. 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 Heavy Industries, Ltd. have?

Sumitomo Heavy Industries, Ltd. has 56 buy-side and 46 sell-side disclosures on record, covering ¥140.1B ($903.6M) in total reported value, spanning 2022-12-22 to 2026-04-21.

Where does StockDrifts get Sumitomo Heavy Industries, 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 Heavy Industries, Ltd. 6302

Company

住友重機械工業株式会社Sumitomo Heavy Industries, Ltd.

Investors

Buys

Total Value

¥140.1B ($903.6M)

Avg Return

+48.49%

Last Filing

2026-04-21

Sumitomo Heavy Industries, Ltd. (6302) has 56 disclosed large-shareholding filings and 46 disclosed disposals on record, filed by 17 distinct investors. Together those filings cover ¥140.1B ($903.6M) in reported transaction value. The earliest filing StockDrifts holds for Sumitomo Heavy Industries, Ltd. is dated 2022-12-22; the most recent is 2026-04-21. 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 +48.49%, 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
2026-08-10	SELL	unknown	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	7.3M	¥5,931	-1.1%	¥7.7B ($49.9M)
2026-07-02	SELL	unknown	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	8.6M	¥5,250	+0.2%	¥7.0B ($45.4M)
2026-05-28	SELL	unknown	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	10.0M	¥5,293	+1.5%	¥7.2B ($46.6M)
2026-04-21	BUY	unknown	三井住友信託銀行株式会社	other	1.2M	¥5,195	+4.5%	¥6.0B ($38.7M)
2026-04-21	SELL	unknown	アモーヴァ・アセットマネジメント株式会社	other	4.4M	¥5,195	-4.5%	¥128M ($824K)
2026-04-21	SELL	unknown	三井住友トラスト・アセットマネジメント株式会社	other	3.5M	¥5,195	-4.5%	¥1.9B ($12.4M)
2026-04-06	BUY	Market Buy	野村アセットマネジメント株式会社	other	7.7M	¥5,057	+3.7%	¥6.2B ($40.1M)
2026-04-06	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	213.4K	¥5,057	+3.7%	¥1.1B ($7.0M)
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	1.1M	¥5,016	+4.6%	¥5.5B ($35.5M)
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	1.9M	¥5,016	+4.6%	¥9.5B ($61.2M)
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	266.4K	¥5,016	+4.6%	¥1.3B ($8.6M)
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	438.4K	¥5,016	+4.6%	¥2.2B ($14.2M)
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	366.8K	¥5,016	+4.6%	¥1.8B ($11.9M)
2026-04-03	BUY	Market Buy	ブラックロック(ネザーランド)BVBV) BlackRock (Netherlands	passive	139.5K	¥5,016	+4.6%	¥700M ($4.5M)
2026-04-03	BUY	Market Buy	ブラックロック・ジャパン株式会社	passive	2.1M	¥5,016	+4.6%	¥10.5B ($68.0M)
2026-02-27	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	11.3M	¥6,173	+14.0%	¥7.7B ($49.9M)
2026-01-21	BUY	Market Buy	アモーヴァ・アセットマネジメント株式会社	other	4.4M	¥4,813	+10.3%	¥23.6B ($152.1M)
2026-01-21	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	other	3.9M	¥4,813	+10.3%	¥20.6B ($133.2M)
2026-01-21	BUY	Market Buy	三井住友信託銀行株式会社	other	1.2M	¥4,813	-10.3%	¥6.1B ($39.5M)
2025-12-15	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	12.6M	¥4,319	-22.9%	¥5.4B ($34.9M)
2025-12-04	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	6.4M	¥4,367	+21.6%	¥28.1B ($181.0M)
2025-12-01	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	13.9M	¥4,189	-26.7%	¥5.4B ($34.5M)
2025-11-20	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	4.2M	¥4,052	+31.0%	¥4.7B ($30.5M)
2025-11-20	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	3.8M	¥4,052	+31.0%	¥946M ($6.1M)
2025-11-20	BUY	Market Buy	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	other	1.2M	¥4,052	+31.0%	¥4.7B ($30.2M)
2025-11-10	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	6.0M	¥4,072	-30.4%	¥801M ($5.2M)
2025-11-10	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	99.9K	¥4,072	-30.4%	¥200M ($1.3M)
2025-11-05	SELL	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	15.1M	¥4,108	-29.2%	¥6.8B ($43.6M)
2025-09-22	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	6.2M	¥3,425	+55.0%	¥20.9B ($135.1M)
2025-09-22	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	143.1K	¥3,425	-55.0%	¥21.0B ($135.8M)
2025-09-19	BUY	unknown	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	other	1.2M	¥3,392	+56.5%	¥3.9B ($25.3M)
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	3.0M	¥3,392	+56.5%	¥375M ($2.4M)
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	3.6M	¥3,392	-56.5%	¥375M ($2.4M)
2025-08-06	SELL	unknown	日興アセットマネジメント株式会社 Nikko Asset Management Co.,Ltd.	other	2.9M	¥3,391	-56.5%	¥333M ($2.2M)
2025-08-06	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	3.7M	¥3,391	-56.5%	¥292M ($1.9M)
2025-08-06	BUY	unknown	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	other	1.2M	¥3,391	+56.5%	¥3.9B ($25.2M)
2025-05-09	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	206.6K	¥2,971	-78.7%	¥7.4B ($48.1M)
2025-05-09	BUY	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	6.6M	¥2,971	+78.7%	¥5.0B ($32.3M)
2025-05-09	BUY	unknown	野村證券株式会社 Nomura Securities Co.,Ltd.	other	104.5K	¥2,971	+78.7%	¥25.6B ($164.9M)
2025-05-08	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	3.0M	¥2,947	+80.1%	¥254M ($1.6M)
2025-05-08	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	3.8M	¥2,947	-80.1%	¥72M ($467K)
2025-05-08	BUY	Market Buy	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	other	1.2M	¥2,947	+80.1%	¥3.4B ($21.9M)
2025-04-18	SELL	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	4.9M	¥2,898	-83.2%	¥107M ($689K)
2025-04-18	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	15.6K	¥2,898	+83.2%	¥3.6B ($23.0M)
2025-04-18	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	2.7M	¥2,898	+83.2%	¥2.9B ($18.6M)
2025-03-24	BUY	subscription	シルチェスター・インターナショナル・インベスターズ・エルエルピー (Silchester International Investors LLP) Silchester International Investors LLP	activist	16.8M	¥3,259	+62.9%	¥240M ($1.6M)
2025-03-21	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	2.9M	¥3,265	+62.6%	¥40M ($259K)
2025-03-21	SELL	unknown	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	4.9M	¥3,265	-62.6%	¥5.0B ($32.1M)
2025-03-21	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	1.7M	¥3,265	+62.6%	¥3.7B ($24.1M)
2025-03-21	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	3.8M	¥3,265	+62.6%	¥722M ($4.7M)

Showing the 50 most recent of 127 filings.

Frequently asked questions

Who has been buying Sumitomo Heavy Industries, Ltd. stock?: 17 distinct investors have filed 56 disclosed large-shareholding filings in Sumitomo Heavy Industries, Ltd. (6302), most recently on 2026-04-21. 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 Heavy Industries, Ltd. have?: Sumitomo Heavy Industries, Ltd. has 56 buy-side and 46 sell-side disclosures on record, covering ¥140.1B ($903.6M) in total reported value, spanning 2022-12-22 to 2026-04-21.
Where does StockDrifts get Sumitomo Heavy Industries, 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 Heavy Industries, Ltd.. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.