Who has been buying OSG Corporation stock?

8 distinct investors have filed 34 disclosed large-shareholding filings in OSG Corporation (6136), most recently on 2026-05-11. 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 OSG Corporation have?

OSG Corporation has 34 buy-side and 32 sell-side disclosures on record, covering ¥56.7B ($365.6M) in total reported value, spanning 2021-06-07 to 2026-05-11.

Where does StockDrifts get OSG Corporation 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.

OSG Corporation 6136

Company

オーエスジー株式会社OSG Corporation

Investors

Buys

Total Value

¥56.7B ($365.6M)

Avg Return

+51.67%

Last Filing

2026-05-11

OSG Corporation (6136) has 34 disclosed large-shareholding filings and 32 disclosed disposals on record, filed by 8 distinct investors. Together those filings cover ¥56.7B ($365.6M) in reported transaction value. The earliest filing StockDrifts holds for OSG Corporation is dated 2021-06-07; the most recent is 2026-05-11. 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 +51.67%, 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
2026-08-06	BUY	Market Buy	アモーヴァ・アセットマネジメント株式会社	other	3.8M	¥3,952	-1.1%	¥4.7B ($30.6M)
2026-08-06	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	1.5M	¥3,952	-1.1%	¥266M ($1.7M)
2026-08-06	BUY	negotiated	三井住友信託銀行株式会社	strategic	1.0M	¥3,952	-1.1%	¥4.0B ($25.5M)
2026-07-06	BUY	unknown	野村アセットマネジメント株式会社	other	1.6M	¥4,020	-0.8%	¥6.3B ($40.8M)
2026-07-06	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	¥4,020	-0.8%	-
2026-07-06	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	4.3M	¥4,020	-0.8%	¥1.6B ($10.2M)
2026-07-06	SELL	unknown	野村證券株式会社	other	3.9M	¥4,020	+0.8%	¥773M ($5.0M)
2026-06-19	BUY	Market Buy	野村證券株式会社	other	4.1M	¥3,661	+2.2%	¥739M ($4.8M)
2026-06-19	SELL	unknown	野村アセットマネジメント株式会社	other	1.6M	¥3,661	-2.2%	¥106M ($681K)
2026-06-19	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	¥3,661	+2.2%	-
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	3.9M	¥3,661	-2.2%	¥2.5B ($15.9M)
2026-06-04	BUY	unknown	アモーヴァ・アセットマネジメント株式会社	other	2.6M	¥3,366	+21.8%	¥8.6B ($55.6M)
2026-06-04	BUY	unknown	三井住友トラスト・アセットマネジメント株式会社	other	1.4M	¥3,366	+21.8%	¥4.8B ($30.7M)
2026-06-04	BUY	negotiated	三井住友信託銀行株式会社	strategic	1.0M	¥3,366	+21.8%	¥3.4B ($21.7M)
2026-05-27	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	¥3,464	+5.7%	-
2026-05-27	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	4.6M	¥3,464	-5.7%	¥999M ($6.4M)
2026-05-27	BUY	Market Buy	野村證券株式会社	other	3.9M	¥3,464	+5.7%	¥67M ($430K)
2026-05-27	BUY	unknown	野村アセットマネジメント株式会社	other	1.6M	¥3,464	+5.7%	¥5.6B ($35.8M)
2026-05-22	BUY	unknown	SMBC日興証券株式会社	other	399.1K	¥3,395	+7.8%	¥1.4B ($8.7M)
2026-05-22	BUY	unknown	株式会社三井住友銀行	other	2.1M	¥3,395	+7.8%	¥7.1B ($46.0M)
2026-05-22	BUY	Market Buy	三井住友DSアセットマネジメント株式会社	passive	2.8M	¥3,395	+7.8%	¥9.3B ($60.3M)
2026-05-21	SELL	unknown	野村アセットマネジメント株式会社	other	1.6M	¥3,304	-2.1%	¥32M ($205K)
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	¥3,304	+2.1%	-
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	4.9M	¥3,304	+2.1%	¥2.1B ($13.5M)
2026-05-21	SELL	unknown	野村證券株式会社	other	3.9M	¥3,304	-2.1%	¥540M ($3.5M)
2026-05-11	BUY	unknown	野村アセットマネジメント株式会社	other	1.5M	¥3,478	-1.6%	¥5.2B ($33.5M)
2026-05-11	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	¥3,478	-1.6%	-
2026-05-11	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	4.2M	¥3,478	-1.6%	¥4.3B ($28.0M)
2026-05-11	BUY	Market Buy	野村證券株式会社	other	3.9M	¥3,478	-1.6%	¥67M ($431K)
2026-03-05	SELL	Market Buy	野村アセットマネジメント株式会社	other	1.5M	¥2,742	-10.6%	¥4.6B ($29.4M)
2026-03-05	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	¥2,742	-10.6%	-
2026-03-05	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	2.9M	¥2,742	+10.6%	¥8.7B ($56.0M)
2026-03-05	BUY	Market Buy	野村證券株式会社	other	3.9M	¥2,742	+10.6%	¥11.8B ($75.8M)
2026-02-19	BUY	unknown	野村アセットマネジメント株式会社	other	1.5M	¥2,864.5	+5.9%	¥4.6B ($29.5M)
2026-02-19	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	¥2,864.5	-5.9%	-
2026-02-19	SELL	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	2.6M	¥2,864.5	-5.9%	¥7.9B ($51.1M)
2026-02-19	SELL	unknown	野村證券株式会社	other	3.8M	¥2,864.5	-5.9%	¥11.6B ($74.8M)
2025-12-04	SELL	unknown	野村アセットマネジメント株式会社	other	1.5M	¥2,312	-31.2%	¥4.5B ($29.3M)
2025-12-04	BUY	unknown	ノムラインターナショナルピーエルシー NOMURA INTERNATIONAL PLC	other	2.7M	¥2,312	+31.2%	¥8.2B ($53.2M)
2025-12-04	BUY	unknown	野村證券株式会社	other	3.8M	¥2,312	+31.2%	¥11.6B ($75.0M)
2025-09-19	SELL	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	1.3M	¥2,038	-48.9%	¥705M ($4.6M)
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	1.8M	¥2,038	-48.9%	¥862M ($5.6M)
2025-09-19	BUY	negotiated	三井住友信託銀行株式会社 Sumitomo Mitsui Trust Bank,Limited	strategic	1.0M	¥2,038	+48.9%	¥59M ($379K)
2025-09-18	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	2.3M	¥2,060	-47.3%	¥456M ($2.9M)
2025-09-18	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	¥2,060	+47.3%	¥1.2B ($7.9M)
2025-09-18	SELL	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	3.8M	¥2,060	-47.3%	¥59M ($383K)
2025-08-06	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	2.5M	¥2,031.5	-49.4%	¥723M ($4.7M)
2025-08-06	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	2.0M	¥2,031.5	+49.4%	¥1.9B ($12.3M)
2025-08-06	BUY	Market Buy	野村證券株式会社 Nomura Securities Co.,Ltd.	other	3.8M	¥2,031.5	+49.4%	¥684M ($4.4M)
2025-06-20	BUY	Market Buy	野村アセットマネジメント株式会社 Nomura Asset Management Co., Ltd.	other	3.0M	¥1,674.5	+81.2%	¥1.5B ($9.6M)

Showing the 50 most recent of 104 filings.

Frequently asked questions

Who has been buying OSG Corporation stock?: 8 distinct investors have filed 34 disclosed large-shareholding filings in OSG Corporation (6136), most recently on 2026-05-11. 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 OSG Corporation have?: OSG Corporation has 34 buy-side and 32 sell-side disclosures on record, covering ¥56.7B ($365.6M) in total reported value, spanning 2021-06-07 to 2026-05-11.
Where does StockDrifts get OSG Corporation 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 OSG Corporation. For how StockDrifts scores these disclosures, see the Japan insider signal tier research, or browse every Japanese stock we track.