Who has been buying Okuma Corporation stock?

11 distinct investors have filed 34 disclosed large-shareholding filings in Okuma Corporation (6103), most recently on 2026-04-20. 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 Okuma Corporation have?

Okuma Corporation has 34 buy-side and 38 sell-side disclosures on record, covering ¥70.0B ($451.4M) in total reported value, spanning 2021-12-22 to 2026-04-20.

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.

Okuma Corporation 6103

Company

オークマ株式会社Okuma Corporation

Investors

Buys

Total Value

¥70.0B ($451.4M)

Avg Return

+29.01%

Last Filing

2026-04-20

Okuma Corporation (6103) has 34 disclosed large-shareholding filings and 38 disclosed disposals on record, filed by 11 distinct investors. Together those filings cover ¥70.0B ($451.4M) in reported transaction value. The earliest filing StockDrifts holds for Okuma Corporation is dated 2021-12-22; the most recent is 2026-04-20. Across these filings the average return since disclosure is +29.01%, 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
2026-08-07	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	127.0K	¥5,580	-	¥709M ($4.6M)
2026-08-07	SELL	unknown	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	other	0	¥5,580	+19.8%	¥979M ($6.3M)
2026-08-07	SELL	unknown	野村アセットマネジメント株式会社	other	4.7M	¥5,580	+19.8%	¥716M ($4.6M)
2026-08-07	SELL	unknown	野村證券株式会社	other	-2.2K	¥5,280	+0.0%	-
2026-08-03	BUY	Market Buy	三菱UFJ信託銀行株式会社	passive	561.4K	¥4,890	-8.5%	¥2.7B ($17.7M)
2026-08-03	BUY	Market Buy	三菱UFJアセットマネジメント株式会社	passive	1.4M	¥4,890	-8.5%	¥6.7B ($43.2M)
2026-08-03	BUY	unknown	三菱UFJモルガン・スタンレー証券株式会社	other	132.2K	¥4,890	-8.5%	¥646M ($4.2M)
2026-08-03	BUY	negotiated	株式会社三菱UFJ銀行	strategic	1.3M	¥4,890	-8.5%	¥6.6B ($42.3M)
2026-06-29	BUY	Market Buy	三菱UFJアセットマネジメント株式会社	passive	1.3M	¥4,550	-1.6%	¥184M ($1.2M)
2026-06-29	SELL	negotiated	株式会社三菱UFJ銀行	strategic	1.3M	¥4,550	+1.6%	¥2.1B ($13.3M)
2026-06-29	SELL	Market Buy	三菱UFJ信託銀行株式会社	passive	528.6K	¥4,550	+1.6%	¥522M ($3.4M)
2026-06-29	BUY	unknown	三菱UFJモルガン・スタンレー証券株式会社	other	104.1K	¥4,550	-	¥473M ($3.1M)
2026-06-19	BUY	unknown	野村證券株式会社	other	752.4K	¥4,560	-	¥3.4B ($22.1M)
2026-06-19	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	49.7K	¥4,560	+1.9%	¥369M ($2.4M)
2026-06-19	BUY	Market Buy	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	other	172.8K	¥4,560	-1.9%	¥800M ($5.2M)
2026-06-19	SELL	unknown	野村アセットマネジメント株式会社	other	4.8M	¥4,560	+1.9%	¥2.6B ($16.9M)
2026-06-04	BUY	unknown	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	other	0	¥4,075	-	-
2026-06-04	SELL	unknown	野村アセットマネジメント株式会社	other	5.4M	¥4,075	-9.8%	¥303M ($2.0M)
2026-06-04	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	129.1K	¥4,075	-9.8%	¥2.4B ($15.8M)
2026-05-21	SELL	unknown	野村證券株式会社	other	6.9K	¥4,035	-10.9%	¥681M ($4.4M)
2026-05-21	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	730.9K	¥4,035	+10.9%	¥3.5B ($22.8M)
2026-05-21	BUY	unknown	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	other	0	¥4,035	-	-
2026-05-21	BUY	Market Buy	野村アセットマネジメント株式会社	other	5.5M	¥4,035	+10.9%	¥844M ($5.4M)
2026-04-20	SELL	Market Buy	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	-151.8K	¥4,340	-9.8%	¥1.7B ($11.0M)
2026-04-20	BUY	Market Buy	野村證券株式会社	other	176.9K	¥4,340	+3.1%	¥732M ($4.7M)
2026-04-20	BUY	Market Buy	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	unknown	0	¥4,340	-	-
2026-04-20	SELL	Market Buy	野村アセットマネジメント株式会社	other	5.3M	¥4,340	-3.1%	¥2.7B ($17.2M)
2026-01-26	BUY	unknown	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	other	0	¥3,815	-	-
2026-01-26	SELL	unknown	野村アセットマネジメント株式会社	other	5.9M	¥3,815	-17.3%	¥26M ($166K)
2026-01-26	SELL	unknown	野村證券株式会社	other	7.0K	¥3,815	-17.3%	¥2.4B ($15.8M)
2026-01-26	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	244.7K	¥3,815	-17.3%	¥695M ($4.5M)
2026-01-22	BUY	unknown	野村證券株式会社	other	645.9K	¥3,955	+13.2%	¥2.6B ($16.7M)
2026-01-22	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	426.5K	¥3,955	-13.2%	¥4.5B ($29.3M)
2026-01-22	BUY	unknown	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	other	0	¥3,955	-	-
2026-01-22	BUY	unknown	野村アセットマネジメント株式会社	other	5.9M	¥3,955	+13.2%	¥1.4B ($8.8M)
2026-01-19	SELL	Market Buy	野村證券株式会社	other	-4.6K	¥4,075	-6.5%	¥20M ($129K)
2026-01-19	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	1.6M	¥4,075	+9.8%	¥2.5B ($16.3M)
2026-01-19	BUY	Market Buy	ノムラセキュリテーズインターナショナル NOMURA SECURITIES INTERNATIONAL,Inc.	other	0	¥4,075	-	-
2026-01-19	BUY	Market Buy	野村アセットマネジメント株式会社	other	5.5M	¥4,075	+9.8%	¥28M ($177K)
2026-01-08	SELL	negotiated	三井住友信託銀行株式会社	strategic	722.5K	¥3,710	-20.6%	¥5.1B ($32.8M)
2026-01-08	SELL	negotiated	三井住友トラスト・アセットマネジメント株式会社	other	911.1K	¥3,710	-20.6%	¥225M ($1.5M)
2026-01-08	BUY	negotiated	アモーヴァ・アセットマネジメント株式会社	other	2.7M	¥3,710	+20.6%	¥1.2B ($7.4M)
2026-01-06	BUY	Market Buy	野村證券株式会社	other	257.6K	¥3,730	+20.0%	¥957M ($6.2M)
2026-01-06	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	954.4K	¥3,730	+20.0%	¥3.1B ($20.1M)
2026-01-06	SELL	Market Buy	野村アセットマネジメント株式会社	other	5.5M	¥3,730	-20.0%	¥3.5B ($22.6M)
2026-01-05	BUY	negotiated	三菱UFJアセットマネジメント株式会社	passive	1.3M	¥3,640	+22.9%	¥123M ($793K)
2026-01-05	SELL	negotiated	株式会社三菱UFJ銀行	strategic	1.8M	¥3,640	-22.9%	¥2.5B ($16.0M)
2026-01-05	BUY	negotiated	三菱UFJ信託銀行株式会社	passive	641.6K	¥3,640	+22.9%	¥295M ($1.9M)
2026-01-05	SELL	negotiated	三菱UFJモルガン・スタンレー証券株式会社	other	37.7K	¥3,640	-22.9%	¥172M ($1.1M)
2025-12-01	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	114.8K	¥3,825	+17.0%	¥129M ($833K)

Showing the 50 most recent of 112 filings.

Frequently asked questions

Who has been buying Okuma Corporation stock?: 11 distinct investors have filed 34 disclosed large-shareholding filings in Okuma Corporation (6103), most recently on 2026-04-20. 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 Okuma Corporation have?: Okuma Corporation has 34 buy-side and 38 sell-side disclosures on record, covering ¥70.0B ($451.4M) in total reported value, spanning 2021-12-22 to 2026-04-20.
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.